Taking action on Climate Change

by Michelle Agha-Hossein, BSRIA Building Performance Lead

Most nations now recognise climate change as an established, perturbing fact that needs immediate attention. We can see the effects in the worsening and more frequent extremes of weather: flash floods, droughts, strong winds, heavy snow, heat waves, etc.

UK temperatures in 2019 were 1.1°C above the 1961-1990 long-term average and it was a particularly wet year across parts of central and northern England. Still fresh in the memory are storms Ciara and Dennis in February 2020 with strong winds and heavy rain that caused significant damage to homes and commercial buildings. There is growing evidence that periods of intensely strong winds and heavy rain are likely to increase in the future.

The UK is not the only country affected by climate change. Many other countries are (and will be) suffering disproportionately. The world’s leading climate scientists have warned that we might have just 12 years to keep global warming at a maximum of 1.5°C. After this point, the risk of extreme weather conditions will significantly increase. The increased frequency and intensity of extreme weather will affect all but is most likely to bring catastrophic consequences in many less economically developed countries, where food shortages and water scarcity can trigger deep social changes.

Immediate radical action is required to limit carbon emissions, and the built environment industry can play a crucial role by changing the prevailing culture.

Most building-related carbon emissions are generated from energy use in buildings. However, there are choices that building owners/operators can make and initiatives that they can undertake to lessen the related negative impact on the environment:

In brand new buildings, the most effective way for addressing emissions is reducing consumption through energy efficient design. In existing buildings, the issue can be addressed by efficient retrofitting and effective maintenance strategy. Adopting renewable energy technologies in both cases can significantly reduce building emissions.

Steps building owners and operators can take today.

There are several initiatives/activities that can help building owners/operators combat climate change:

  • Consider ‘net-zero carbon’ targets for your building: UKGBC launched its Advancing Net Zero programme in 2018 and published the ‘Net Zero Carbon Buildings: A Framework Definition’ in 2019. The framework provides the construction industry with clarity on the outcomes required for a net zero carbon building.
  • Ensure the required outcomes for a ‘net-zero carbon’ building are achieved: As advised by UKGBC in the framework definition, initiatives like BSRIA Soft Landings should be adopted in new build as well as in refurbishment projects to ensure a net zero carbon building will be achieved. The BSRIA Soft Landings framework provides a platform for project teams to understand the required outcomes for their project and ensure all decisions made during the project are based on meeting those outcomes.
  • Maintain your net zero carbon building effectively: Business-focused maintenance is a methodology developed by BSRIA that can be adopted to help building operators maintain critical assets effectively and efficiently to sustain a net zero carbon building within budget.
  • Investigate failure quickly: Is the energy bill for your building higher than it should be? Investigate the problem as soon as you can. The first and easiest step would be looking at the energy end use breakdown to see which areas are using more energy than expected. If the issue is related to the HVAC system, check the system’s setting points and monitor the indoor air temperature and relative humidity. Thermal imaging of the fabric of the building can also help to identify, thermal bridging, missing/damaged insulation and areas of excessive air leakage.
  • Promote a healthy diet among building occupants: This is a non-technical initiative that building owners/operators can adopt in their buildings. Eating less meat and gradually shifting to more plant-based foods is vital for keeping us and our planet healthy.  It is important to think about initiatives such as using signage or lunchtime talks, to educate building occupants about healthy diets and encourage them to eat more fruit and vegetables. Research has shown that adhering to health guidelines on meat consumption could cut global food-related emissions by nearly a third by 2050. Healthy diet is also supported by Fitwel and the WELL building standard.

Building owners and operators, to play their role in combating climate change, should ensure their decisions and the way they create and run their buildings contribute positively to the wellbeing of our planet and its citizens.

So, make a start today and choose the first thing you are going to assess/change in your building to help combat climate change.

To find out more about how BSRIA can help you improve building performance, visit us here.

The wellbeing and environmental effects of agile working

by David Bleicher, BSRIA Publications Manager

How many times in the last few months have you started a sentence with “When things get back to normal…”? For those of us whose work mostly involves tapping keys on a keyboard, “normal” implies commuting to an office building five days a week and staying there for eight or more hours a day.

When lockdown restrictions were imposed, things that were previously unthinkable, such as working from home every day, conducting all our meetings by video call, and not having easy access to a printer, became “the new normal”.

One thing the pandemic has taught us is that changes to our work habits are possible – we don’t have to do things the way we’ve always done them. Since lockdown, agile working has been high on companies’ agendas; but agile working has a broader scope than flexible working. It is defined as “bringing people, processes, connectivity and technology, time and place together to find the most appropriate and effective way of working to carry out a particular task.”

Working from home with a cat

The triple bottom line

Agile working is indeed about much more than changing people’s working hours and locations. It’s about how people work – becoming focused on the outcome rather than the process. It’s about making the best use of technology to achieve those outcomes and it’s also about reconfiguring workplaces to better suit the new ways of working. But, when considering these outcomes, we should be looking further than the financial bottom line. The term triple bottom line is a framework that also brings social and environmental aspects into consideration.

How, when and where people work has a major impact on their wellbeing. The past few months have served as an unintentional experiment in the wellbeing effects of mass home working. Some people are less stressed and more productive working from home, providing they have regular contact with their colleagues. Other people – particularly those who don’t have a dedicated home working space – returned to their offices as soon as it was safe to do so. It depends on the individual’s preferences, personal circumstances and the nature of the work they do.

On the face of it, it would seem that increased working from home or from local coworking spaces would be a win-win for the environment. Less commuting means fewer CO2 emissions and less urban air pollution. But a study by global consulting firm and BSRIA member, WSP, found that year-round home working could result in an overall increase in CO2 emissions.

In short, it reduces office air conditioning energy use in the summer, but greatly increases home heating energy use in the winter – more than offsetting carbon savings from reduced commuting. Perhaps what this highlights most is just how inefficient the UK’s housing stock is. If we all lived in low energy homes with good level insulation and electric heat pumps, the equation would be very different. Perhaps a flexible solution allowing home working in summer and promoting office working in winter would be best from an environmental perspective.

A possible long-term effect of increased home working is that some people may move further away from their offices. For example, someone might choose to swap a five-days-a-week 20 km commute for a one-day-a-week 100 km commute. If that is also a move to a more suburban or rural location with more scattered development, less public transport and fewer amenities within walking distance, then (for that individual at least) there’ll be an increased carbon footprint. Not very agile.

Impact of technology

There’s another aspect that may not yet come high up in public awareness. Remote working is dependent on technology – in particular, the video calls that so many of us have become adept at over the past few months. All this processing burns up energy. The effect on home and office electricity bills may be negligible because the processing is done in the cloud. This isn’t some imaginary, nebulous place. The cloud is really a network of data centres around the world, churning data at lightning speed and, despite ongoing efforts, still generating a whole lot of CO2 emissions in the process. Videoconferencing definitely makes sense from both an economic and environmental perspective when it reduces the need for business travel, but if those people would “normally” be working in the same building, isn’t it just adding to global CO2 emissions?

We don’t yet know what “the new normal” is going to look like. Undoubtedly, we’re going to see more remote working, but responsible employers should weigh up the pros and cons economically, environmentally and socially. Terminating the lease on an office building may seem like a sensible cost saving, but can a workforce really be productive when they never meet face-to-face? Does an activity that seemingly reduces CO2 emissions actually just increase emissions elsewhere? Any agile working solution must take all of these things into account, and not attempt a one-size-fits-all approach to productivity, environmental good practice and employee wellbeing.

For more information on how BSRIA can support your business with energy advice and related services, visit us here: BSRIA Energy Advice.

What makes a good PICV?

by Andrew Pender, National Sales Manager at FloControl Ltd.

Over the last 5 years, PICVs have been widely accepted as the best method of terminal control in variable flow systems due to their energy saving potential.  The surge in popularity has led to an influx of products with varying designs, features and functionality.  This article reviews some of the mechanical PICV design elements and how they can impact on the PICV’s performance in an applicational context.

Where do we start?

To help specifiers and project engineers assess which PICV is best suited for an application, the BSRIA BTS1/2019 standard has been developed to provide a consistent test method for PICV manufacturer’s products to be benchmarked against.

Manufacturers should be able to provide test results in line with this technical standard which covers:

  • measured flow vs nominal flow
  • pressure independency or flow limitation
  • control characteristics, both linear and equal percentage
  • seat leakage test

Repeatability & Accuracy are central to the tests and they are key to good temperature control and realising the full energy saving potential of a PICV installation.

An accurate PICV means the measured results will be equal or very close to the manufacturer’s published nominal flow rate each time it is measured, known as low hysteresis.

Accuracy has a positive impact on a building’s energy consumption.  “Measured over time, a 1% increase in the accuracy of a PICV can result in a reduction of around 0.5% in the building’s overall hydronic energy consumption” (FlowCon International).

Valve accuracy is driven by the design, manufacturing process and material used for the internals of the valve.

  • The design of the PICV should allow for Full Stroke Modulating Control at all flow settings without any stroke limitation.  The flow setting and temperature control components should operate independently.  Some PICV designs use the stroke of the actuator stem to set the flow rate resulting in limited stroke and control.  This can cause issues at low flow rates whereby the PICV effectively becomes on/off irrespective of actuator selection.  
  • The manufacturing process and the component materials also contribute to accuracy. For example, injection-moulded, glass-reinforced composite materials cope better with water conditions that valves can be exposed to.  They also have less material shrinkage than other materials, delivering higher accuracy than valves that use alloy components.

What else should be considered?

The importance of accuracy and repeatability are paramount when selecting a PICV however there are other factors that should be considered:

  • Wide flow rate range – including low flow rates for heating applications, ideally covered by a small number of valves.
  • Setting the flow rate – setting the PICV can influence the accuracy. There are various scales used including set points related to flow rates and percentages. PICVs with very detailed scales with small increments between set points are more difficult to set accurately, leading to higher tolerances than the BSRIA standard recommended + 10%.
  • Wide ΔP Range – low start up pressure. To operate satisfactorily, the PICV requires a minimum pressure differential to overcome the initial spring resistance within the PICV, enabling the spring to move and take control. Care should be taken to ensure the minimum pressure differential is as low as possible to maximise the energy saving potential of the system.  The maximum DP should also be considered to ensure the PICV operates effectively under part load conditions.
  • Dirt tolerance – the Valve Control Opening Area [A] on all PICVs, irrespective of the manufacturer, is identical for each flow rate. The shape of the Control Area can be different depending on the valve design. A Rectangular flow aperture is more tolerant than an Annular flow aperture. Debris will pass through the rectangular aperture more easily.
  • Removable inserts – deliver the greatest flexibility and serviceability.  Products can be easily serviced in line without disruption. This is especially of value when water quality is poor or when flow requirements change due to changes in space usage.  Inserts can also be removed during flushing.  Valve bodies can be installed with blank caps eliminating the risk of damaging or contaminating the PICV element, whilst having a full-bore flushing capacity.
  • Installation – PICVs in general have no installation restrictions however in line with BSRIA BG29/20, it is recommended that PICVs should be installed in the return branch as small bore PICVs will have a high resistance which will hinder the flushing velocity during the forward flushing of terminal units.

Making the right choice

There are many aspects for specifiers and project engineers to consider when selecting the right PICV for an application.  The BTS1/2019 standard provides an excellent benchmark, but the individual designs also need to be carefully considered.  A correctly selected PICV will ultimately lead to a more comfortable indoor climate with better control of the space heating and cooling as well as potentially reducing the pump energy consumption in a building by up to 35%.

This post was authored by Andrew Pender, National Sales Manager at FloControl Ltd. All views expressed are those of the author. If you belong to a BSRIA Member company and wish to contribute to the BSRIA Blog, please contact marketing@bsria.co.uk

Shift in Construction Technology for a ‘post-Covid, pre-vaccine’ era

by Amy Butler, JB Associates

In 2017, McKinsey Global Institute slated construction for evolving at a ‘glacial pace’ due to its ranking as the least-digitised industry in Europe. While plenty of technological advances were pitted as ‘on the horizon’, many companies were reluctant to take the necessary steps to push forward with digitisation. Critics warned that a lack of innovation would lead to companies folding, although it took a global pandemic before this prophecy materialised and those without suitable digital infrastructure in place were shaken.

The pandemic is now considered a catalyst for industry improvement, propelling construction out of its ‘glacial’ evolution and deep into the digitised era. A recent study undertaken by Procore found that two thirds of the surveyed construction companies had rolled out new technology during the lockdown, with 94% of these seeing an improvement to productivity and teamwork. However, what exactly are these technologies and where do we go from here?

Smart Buildings

While we are all now experts in the world of Zoom and Microsoft Teams, the challenge lies in returning safely to offices and various other workspaces. With many UK companies pushing for their teams to be back in work physically, how do we ensure that commercial buildings remain safe? Smart Building technology is reshaping the workplace and ensuring safety as well as energy optimisation. Buildings with integrated BMS systems and IoT sensors were already an option before the pandemic. Now, they are a wise choice for business owners.

Essential for a post-Pandemic and pre-Vaccine era, IoT systems can control air quality and ventilation. High-performance air filters and moisture controls will now be key due to Covid-19’s airborne nature. OKTO Technologies (Smart Buildings specialists) have even launched an Artificial Intelligence-led air filtration solution that is reportedly so advanced it can eliminate 99.98% of SARS-CoV-2 (the virus that causes Covid-19) from the air in 10 minutes.

Similarly, density control counters and heat detection cameras can be incorporated into BMS systems to ensure that viruses are less likely to spread or enter into a facility. Airports have been trialling infrared cameras to measure body temperatures for a fever and several companies offer leases or installations for these cameras. While they are not a definitive medical diagnosis, they add a level of reassurance. This may be the aim of much of this technology; a form of due diligence in protecting staff.

BIM & VR

Technological advances are also prominent on site. Construction News reported that contractors employed for the Nightingale Hospital projects found huge value in Autodesk programs. A vital tool for tracking constant streams of updates in rapid working conditions, construction management software proved its worth in recognisably challenging projects across the UK.

As social distancing measures remain in place, it is imperative that technology is prioritised; virtual communication is still far safer than face-to-face. Software like BIM is also providing insights and tools to manage projects during a more challenging time. Even more impressively, companies are merging BIM models with the cloud, GPS and Virtual Reality software. This development means a ‘digital twin’ of a facility can be created and it opens a world of opportunities for Project Management and Design efficiency.

Remote working could even be a trend that stays long past pandemic precautions. Drones have been used previously to reduce safety hazards for technicians and now may be utilised in future remote inspections. Similarly, researchers at the University of Strathclyde have been given £35,000 in funding to create a remote inspection system. The 3D immersive building environment program aims to reduce risks by eradicating the need for Quantity Surveyors or Health and Safety Inspectors to be physically present on site.

Whether enabling remote working, improving the health and safety of commercial buildings or aiding on-site processes, technology has become a necessary tool for construction in the last 6 months. The companies that had embraced digitisation long before 2020 were undoubtedly the ones able to continue thriving in the tough lockdown period. The next step is for many companies is to streamline their management processes or workplace systems to ensure technology works for them as efficiently as possible. Breaking out of its inertia, construction’s ‘glacial evolution’ is firmly in the past and technological advances are here to stay.

This post was authored by Amy Butler of JB Associates – building consultancy specialists. The views expressed are those of the author.

BSRIA Members wishing to make a guest contribution to the BSRIA Blog should please contact marketing@bsria.co.uk

Maintenance of drainage systems to prevent flooding and water pollution

By David Bleicher
BSRIA Publications Manager

Every building has a drainage system. In fact, most have two – a foul drainage system that takes waste from toilets, showers etc. and a storm/surface water drainage system that takes rainwater from roofs and paved areas. Older buildings may have a combined system, and in some locations the infrastructure buried under the street is a combined sewer – a legacy from the pioneering days of city sewerage systems.

As with maintenance of any building services systems, the first step is to know what you’ve got. Every site should have a drainage plan, showing which drains are located where, what direction they flow in and what they connect to. If there isn’t one, it’s not hard to create one – even though the pipes are buried, there’s plenty of evidence above ground in the form of manholes.

When there is a drainage plan, it’s worth checking how correct and up-to-date it is. Sometimes, the exercise of doing this brings up evidence of mis-connections, such as a new loo discharging into a storm manhole. It’s also worth marking drain covers with the service (F for foul or S for storm) and a direction arrow.

Drainage manhole over showing 'S' arrow to indicate storm drainage and direction of flow.

In foul drainage systems, the biggest headaches are caused by things going down the drain which shouldn’t – like wet wipes, sanitary products and hand towels. So the best form of preventative maintenance is to keep building occupants informed, with polite notices and clearly-marked bins in strategic places. Then there is the fats, oils and greases (FOG) that go down the plughole in catering establishments. If these find their way into the drains and sewers, they’re pretty much guaranteed to solidify and cause blockages – sometimes known as ‘fatbergs’. That’s why there should always be an interceptor in place, also known as a grease trap. This needs maintenance – the generic frequency for cleaning out a grease trap, stated in SFG20 (a common approach to planned preventative maintenance), is monthly. But this will be highly dependent on how the facility is used.

If blockages go unchecked, they may also go unnoticed. That is until sewage starts backing up into the building, or overflowing into storm sewers, which eventually discharge into lakes and rivers. These are delicate ecosystems, and the introduction of detergents and faecal matter can be very harmful to aquatic life and of course humans.

Rain, can pick up contaminants from both the air and the land, so once it has reached a storm/surface water drainage system, it has picked up dirt, oil and chemicals from air pollution, roofs and paved areas. Traditional systems have no means of dealing with this, and also must be sized for occasional extreme storm events, so the pipes are very large and mostly used at a fraction of their capacity. Sustainable drainage systems, or SuDS, attenuate the flow of rainwater to watercourses and emulate the way natural ecosystems treat this water. But they need maintenance. For example, any tree routes that could block a soakaway should be trimmed annually, and green roofs may require weeding on a weekly basis during the growing season.

For more information on the maintenance of drainage systems, please explore the BSRIA Information Service

COVID-19 pandemic’s impact on US businesses and real estate

Zoltan Karpathy
Operations Manager, BSRIA Worldwide Market Intelligence

Nobody can predict with a high degree of certainty how long the current COVID-19 pandemic will last and what will be the full impact on the economy. We are witnessing US states, including Florida, opening up and having to tighten measures again as the virus flares up.

To contain the pandemic regulations started to push businesses towards investments to increase health safety and prevent spreading the COVID-19 virus. While necessary to fight the pandemic and speed up the recovery, businesses sometimes suffer temporary loss of productivity when the measures are implemented.

Another hike of investment as the direct consequence of the economic shock triggered by the pandemic is often related to the need of diversifying suppliers; and purchases from a variety of suppliers are often done with less favourable prices. Increasing inventory levels of critical raw materials/components/products are also becoming an issue.

Verticals served by the HVAC&R sector have been hit at various levels of degree by the COVID-19 pandemic. Venues, such as live entertainment, sports, restaurants and travel-related establishments are likely to struggle due to concerns over contracting the virus, even when they become fully open. It is expected that consumer will shift away from these types of spending to alternatives such as durable goods, which in turn can have a positive effect on housing in the future.

Nevertheless, on the residential side, housing starts plummeted by 43% in the three months from February to April, even though several US states allowed construction sites to operate. Sales of existing homes also declined, with April’s transaction level at three-quarters of the February level. Residential construction is expected to slow down in the medium term, as consumers are unable or unwilling to purchase new houses, even though mortgage rates are very low.

Economists are drawing up various scenarios and assess likelihoods of these potential outcomes. According to Deloitte the most probable scenario is that the US economic recovery will not take place at least until the middle of 2021; growth can return to the pre-COVID level by the end of 2023, but the economy will not be able to achieve full employment again until 2025.

In the context of such uncertainty, manufacturers active in the HVAC&R and Building Controls sector are facing a wide range of unknown factors:

  • customers building up stock for an eventual second COVID-19 wave;
  • concerns over debt payments;
  • increasing payment periods;
  • increasing raw material prices;
  • pressure to maintain the price of their final products/solutions.

In terms of the product mix, HVAC companies started to receive more enquires for certain types of filters, more emphasis on increasing volume of fresh air and generally an increasing focus on Indoor Air Quality.

This goes hand in hand with the fact that the current situation is also encouraging building owners and businesses to offer a safe working environment, in which employees trust and feel comfortable. Therefore, increasing investment levels can be expected to make commercial buildings ‘smarter’ and more efficient to use, with the uptake of solutions such as contactless access control, occupancy analytics, employee tracking services, proximity sensing and analytics (using indoor location mapping solutions) and Indoor Air Quality (IAQ) sensing and monitoring, alongside air purification and disinfection solutions.

The COVID-19 pandemic has a significant impact on the real estate market, challenging the building owners and operators at unprecedented levels. According to JLL, the effects in the short term, will be the accelerated large-scale uptake of home working, leading to problems for traditional offices, but also co-working centres and flexible offices, putting a strain on the sustainability of certain flexible space business models. Social distancing considerably increase the space allocated for individuals which means that many flexible offices will record very low space utilisation rates and could even remain nearly empty.

The COVID-19 pandemic has challenged the role of the traditional office and it reinforced the need for the office to act as a communal space which encourages innovation and collaboration, while nurturing company culture. A future solution seems to be an increased focus on technology enabled workplaces which can be used for collaborative meetings and hosting clients.

To assess the full impact of COVID-19 on the US HVAC&R sector, BSRIA will publish an update of its market studies at the end of September 2020.

To find out more about BSRIA HVACR & Controls market studies contact us at:

• America sales enquiries: BSRIA USA: sales@bsria.com ¦ +1 312 753 6803, http://www.bsria.com/us/
• China sales enquiries: BSRIA China: bsria@bsria.com.cn ¦ +86 10 6465 7707, http://www.bsria.com.cn
• All other sales enquiries: BSRIA UK: wmi@bsria.co.uk ¦ +44 (0) 1344 465 540, http://www.bsria.com/uk/

District Heating and Cooling and Heat Interface Units are still closely tied markets

Socrates Christidis
BSRIA Research Manager – Heating and Renewables

District Heating and Cooling networks have witnessed significant growth in many European countries in the last five years and this is set to continue in the coming decade. Significant European policy initiatives, such as the Green Deal, country government promotions, alongside increased public and private investment are supporting new business models such as utilities selling heat as a service and not as a commodity, which will drive the market forward.

BSRIA research indicates that the share of heat pumps and Energy-from-Waste in district heating and cooling systems is increasing. This trend is in line with the development of the concept of 5th generation heat networks. These are demand driven and low-temperature networks, using locally available low-grade waste heat (A/C, datacentres, underground stations, etc.), low temperature renewable energy in bodies of water and solar energy instead of a central energy centre. In principle, such systems favour the use of substations at building level, but no heat interface units at the dwelling level, as these are likely to be replaced by heat pumps.

Currently industrial boilers and CHPs remain the main source of heating in District Heating networks. For instance, 85% of planned heat networks in the UK, will have a CHP as the primary source of heating and 50% will have a gas boiler as a backup. The remaining 15% will use geothermal, ground source or water source heat pumps.

Thus, in the short-term Heat Interface Units (HIUs) will remain the link between the apartment and the network.

Going forward, reducing demand for heating and increasing need for hot water and cooling imply that the market will see the uptake of:

  • All-in-one units (heating or cooling and hot water)
  • Cooling units
  • Hybrid units, with integrated electric water heating
Graph showing European HIUs market growth

The main threats for HIUs market progress are the currently lack of consistent quality of installation and COVID-19.

Heat interface units have a major impact on the overall performance of a heat network and successful operation and performance both depend on correct system design and specification, followed by competent installation and maintenance. This has been problematic, with systems inadequately designed and quite often oversized. We see some signs of improvements as the industry becomes more sensitised towards good quality district heating. Documentation is improving as well as codes of practice, testing of HIUs, and further testing on site; however, under tight budgets the emphasis is often for the lowest cost, specification compliant technology. Testing the unit in a lab and then onsite is optional but critical to ensure performance.

Closing of construction sites was the main impact of the Coronavirus pandemic, including lack of cash flow, as the invoicing is done when products are delivered onsite. The industry has also witnessed a lack of new orders from April to June, with some signs of recovery observed just after. Overall, the European sales in the first 6 months of 2020 were between 15% and 30% down, depending on country, when compared to the 6 first months of 2019.

Going forwards, new construction presents a slightly positive picture. During COVID-19 there has been delays but not cancellations in planning permissions; delays as sites operate under social distancing guidelines and some delays for new investment to come through. However, governments and authorities are still eager to go ahead with programs and incentives, with renewed emphasis on the environmental agenda.

Looking at estimations for completions of flats before and after the outbreak, the recovery is likely to accelerate in 2022, and the market is unlikely to recover before. The end of financial support schemes by governments (VAT deferral, loan schemes or furlough) is likely to have a negative impact on many businesses, including contractors. Indications are, that new build and residential sales will be hit harder than commercial ones. Southern Europe is also likely to struggle more, although recession is expected across most of European countries.

Taking all this into account, BSRIA sees the numbers of heat interface units growing steadily but at a single digit compound annual growth rate of just over 4% on a Pan-European basis. The market will become more diverse and will look for more flexible options to cater for high-end, electricity-only heating, mixed-used and communal areas.

To find out more about BSRIA’s District Energy and Heat Interface unit market studies contact us at:

Acoustics in the workplace – What’s the “new normal”?

Rebecca Hogg
Acoustic Consultant, BSRIA

Wooden blocks spelling 'new normal'

There is no denying global events this year have turned every aspect of our lives upside down, and as we all start to try and get back to normal while lockdown restrictions ease, we realise it is a “new normal”.

Workplaces have changed, some almost unrecognisable from before, and there is a myriad of requirements to consider beyond the essential health and safety measures. Occupant wellbeing was a prominent consideration prior to lockdown, and this included provision of a good acoustic environment, but how are new COVID-secure workplaces affecting the acoustic environment?

For many years there have been acoustic standards and guidelines on internal noise levels in offices, determining sound power levels of building plant, and predicting the sound absorption of materials. Well designed open-plan offices have allowed large groups of people to collaborate and communicate effectively, and noise regulations have ensured factories and construction sites operate without disturbing neighbours.

In recent months, the workplace has been turned on its head. Following government guidelines many people began working from home. Suddenly the familiar hum of the workplace was replaced in some instances with squabbling children or impatient pets, and if you live alone maybe unwelcome silence replaced your usual face-to-face conversations.

As people are gradually allowed to return to a place of work, new COVID-secure offices have changed the acoustic environment. The installation of screens, the partitioning of open plan spaces, wearing of face coverings, and a lower level of occupancy have created acoustic challenges. For example, speech intelligibility is affected by the reverberation time of a space. Fewer people and more reflective materials, such as plastic screens, will decrease the sound absorption and increase the reverberation time, resulting in poorer speech intelligibility.

Building services have been specified, installed, and commissioned for a particular set up of a workplace layout and building occupancy. If a space is divided into individual offices to allow for social distancing, then the building services provision also needs to be reconsidered. Changing the control settings of a system will have an impact on the internal noise levels and subsequently on levels of occupant annoyance.

Not everyone works in an office, so, what about situation in different workplaces? Factories, shops, and construction sites have been redesigned to allow for social distancing, and often operating hours have been extended to allow for shift patterns, potentially increasing noise nuisance for neighbours.

In these environments the noise levels are also often higher and communication between people can therefore be harder. People working further away from each other and wearing face coverings will inhibit successful communication and influence performance, and if someone must shout to be heard does this have the potential to spread virus droplets further? There should also be consideration of the highly overlooked 12 million people in the UK who suffer from some level of hearing loss. Being unable to lip read because someone is wearing a face covering, or unable to hear the conversation over a bad video conferencing link is incredibly frustrating and isolating.

The acoustic challenges within a COVID-secure workplace may seem overwhelming but there are several simple solutions. Firstly, identify noise sources in the workplace and maintain them appropriately to minimise background noise.

Something as simple as cleaning filters inside a fan coil unit can increase airflow and capacity, meaning the fan speed can be reduced and subsequently the noise level.

Secondly, examine acoustic specifications of any new products being installed – ask to see test reports and consider how a new product could influence the acoustic environment.

Finally, consider the occupants of your workplace and how they use the space. Tailoring the acoustic environment to the needs of the occupants can increase productivity, decrease annoyance and overall improve the wellbeing of all. The focus on workplace safety is paramount, but long-term considering other design parameters, such as the acoustic environment, will ensure workplaces not only survive but thrive.

BSRIA acoustic experts publish guidance, and support our members and clients with a range of acoustic testing solutions. Read more about our UKAS-accredited laboratory for acoustic testing to BS EN ISO 3741, BS EN 12102 and BS EN ISO 354 here.

The importance of investigating failures in building services

Pinhole corrosion of radiator (outside surface)
Pinhole corrosion of radiator (outside surface)

A study from the UCL(1) revealed that building failures may cost the UK construction industry £1bn to £2bn every year. This was a conservative estimate made in 2016, based on 1 to 2% of the total value of construction.

As of March 2020, the Office for National Statistics has estimated the total value of all UK construction works to be worth £12.7bn, 68% of which is for new buildings or the repair and maintenance of existing buildings. This would give an estimated cost of failure between £85m and £170m, of which building services would account for a high proportion.

(1) Razak, D S A, Mills, G and Roberts, A (2016) External Failure Cost in Construction Supply Chains. In: P W Chan and C J Neilson (Eds.)

Types of failures in building services

Bathtub curve regarding types of failures in buildings
Bathtub curve

The typical pattern of failure arising against time is shown by the well-known bathtub curve. The curve is divided into three segments: an infant mortality period, usually marked by a rapidly decreasing failure rate; a random failure period, where the failure rate continues at a

The first period is usually detected during the defects liability period after a project is handed over.

The second period would happen during the operation of a system, and failures may occur due to inappropriate operating conditions or maintenance regimes.

The third period is when the system is reaching the end of its life. Failure could be imminent and there should be little or no surprise in this happening.

Importance of investigating these failures

Showing house made of money i.e. there is cost in everything, so always investigate to prevent repetitive failures
There is cost in everything: Always investigate to prevent repetitive failures

There are various reasons why every unexpected failure should be investigated. Below are some of the key ones:

  • Insurance purposes. Insurers may require an independent evaluation of the failure and investigation of its possible cause to identify possible fraudulent or malicious intentions.
  • Cost savings. Too often, failed components are replaced without investigating the root cause. Without understanding the origin of a failure, it is not possible to prevent its re-occurrence. Repetitive failure and replacement of components could add significantly to the operating cost for a building or estate.
  • Health and safety. In May 2009, a lift at London’s Tower Bridge tourist attraction suffered a vital mechanism failure that sent it falling with 9 people in it, four of whom suffered bone fractures. The malfunction was caused by the failure of a counterweight mechanism. The accident investigation by the HSE revealed that there had been several previous component failures with the counterweight mechanism, and the components had been replaced without proper review, and with no investigation into why they were failing so early. Tower Bridge was ordered to pay a total cost of £100k, and the HSE concluded that, had there been a proper review into the counterweight mechanisms, the catastrophic failure of the lift could have been avoided.

BSRIA can help with building services investigations

BSRIA has been in the building services industry for over 60 years and has been involved in hundreds of investigations.

Our independence makes us the ideal partner to provide non-biased failure investigations. Our expertise and capability in testing various materials and components of building services to determine the likely cause of failure is unique. We are able to perform investigations on site, examinations in our labs and analysis in our offices.

Our professional approach is such that there is no failure too large or too small to investigate today because this can save lives and costs tomorrow.

Read more about BSRIA’s Failure Investigation service here

Author: Martin Ronceray, BSRIA Engineering Investigation Lead

The BSRIA investigation team can be contacted at

+44 (0) 1344 465578

Investigations@bsria.co.uk

Construction quality could be catching up with other industries

This blog was written by Lynne Ceeney, Technical Director at BSRIA

If you order steak and chips at a restaurant, but the waiter delivers hake in strips, you would be rightly annoyed. Instinctively you blame the waiter, but it could have been a problem with the ordering software, a misreading in the kitchen or just the wrong dish being picked up.  Whatever, you would send it back – it is not what you ordered.   In new buildings, this happens all the time.  Poor communication during the briefing, design and construction process, and poor handover and operation leads to a building that doesn’t deliver the performance the client thought they had ordered in the first place.  Unlike a dinner, it’s not practical to send a building back and wait for the one you asked for to be delivered.  Instead extensive snagging lists, expensive defect resolution and defensive “best we can do” fixes by the facilities team are often used to try and get the building closer to its intended performance – and “closer” is usually the best that can be achieved. The owner and occupier end up with a disappointing building, and the designers and construction company are left with a disappointed client.  The blame chain spreads, and it’s hard to pin down the fault.

The impacts run way beyond disappointment.  Occupier discomfort impacts staff retention, and the increased societal focus on wellbeing indicates that employees will expect higher standards from their place of work.  Poor commissioning or confusing controls mean building systems that don’t work properly and need constant attention or premature replacement, as the uncomfortable working conditions impact on worker productivity.  Inefficient buildings use more energy requiring more cash and causing more carbon emissions.  In fact buildings contribute 37% of UK green house gas emissions from gas heating, and consume 67% of the electricity used in the country.  It’s no wonder that larger investors are taking much more of an interest in the sustainability and performance of buildings rather than just the upfront capital cost.  Good buildings are an asset, poor buildings become an expensive liability in terms of operating costs and void periods. Competitive property markets compound this situation.

With a typical building having a life expectancy of at least 60 years, we are building in problems for this generation and the next.  We’re not great at mass retrofitting, (and the high demand for additional building stock means a capital, skills and material shortage) so we need to get it right first time.  Effective management tools with this aim abound in other sectors, for example DRIFT, (Doing it Right First Time), Six Sigma, LEAN and Zero Defects.  We see the approach being used in food manufacture, car making, pilot training, and patient healthcare, to name but a few sectors.  So what about construction?

Soft Landings is the equivalent tool for the construction sector.  This tried and tested process was developed to help to produce better performing buildings – not necessarily exceptional in performance, but buildings that deliver in operation what they were designed to do in the first place.  Getting a building right requires a shared focus on operational performance of the building right from the start, and throughout the design, construction and commissioning process.  The use of Soft Landings delivers this shared focus, improving communication and collaboration between all parties in the building delivery chain.  It helps everyone to avoid the pitfalls that diminish operational building performance. It fits with RIBA stages, integrates into existing construction processes, and does not require a specific building procurement model.  You can download Soft Landings guidance from the BSRIA website .

However it is always helpful to find out about real world experiences, and to talk to others who are using Soft Landings to help them to produce better buildings.  With this in mind, BSRIA have organised the 2017 Soft Landings Conference (June 16th 2017 at RIBA, Portland Place, London W1B 1AD). You will hear from a range of speakers from different parts of the construction process – including clients – who will explain how they have used Soft Landings in their projects, and the value that it has delivered for their buildings.  You will also hear their hints and tips, and there will be plenty of time to ask questions and take part in discussion both in conference and over lunch.

It’s time for the construction industry to catch up with other industries in terms of quality, to produce buildings that perform as expected, through a delivery process that gets it right first time.  Soft Landings is a process that helps the delivery chain to do this.  For more information on the conference please contact our Events Manager, Tracey Tilbry.

 

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