www.heatingandventilating.net From the editor
Evolution in building ventilation
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dvancements in ventilation systems and maintaining them have come a long way with the introduction of
more efficient, sustainable solutions and the launch of new standards of compliance. • This includes the launch of the new TR19Air, BESA’s specification which is helping to increase awareness of the importance of clean ductwork in maintaining a safe, healthy, and compliant facility. On pg 14 Gary Nicholls of Swiftclean explains what changes are in the new specification and how it could herald a healthier future for buildings. • Getting it right when choosing terminal
devices could be the difference between a happy or discontent customer. But Mike Gosling of TROX UK believes it is possible to streamline the selection grilles and diffusers effectively and accurately (pg 11). • A dual focus on embodied and
operational carbon is driving innovation, challenging traditional methods, and reshaping priorities in HVAC design. There is evidence of this throughout the industry including an new innovation by Swegon in the form of a wooden AHU prototype which replaces traditional materials with sustainable alternatives (pg 12). This is just a snapshot of some great
features this month. Enjoy it! Heathe Ramsden, Edito
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Cutting edge heat & vent
British Land undertakes decarbonisation challenge at London headquarters
ritish Land’s flagship headquarters, York House, is benefitting from new heat pump technology that has fully replaced the use of gas.
York House is a five-storey, multi-tenanted office building in Marylebone, which previously relied on gas boilers for heating and requires 24-hour cooling with extended fresh air requirements. When looking to decarbonise the building, British Land opted for two air source heat pump chillers and one water-to-water heat pump from Mitsubishi Electric to replace four gas boilers and an old chiller system. This was part of a wider goal to achieve a 75% reduction in operational carbon and a 25% reduction in energy use by 2030, and the result is a building where heat pumps deliver a more than 400 kilowatt-hour reduction in energy use year-on-year. Matt Beales, head of technical project delivery at British Land, said: “The project at York House is unique because it was the first building where we achieved a full gas removal using heat pump technology. Our previous projects have been hybrid with gas being retained, but with this one, we really wanted to lead by example as it’s our head office.” The design of the solution was provided by 21 Engineering, and the starting point was identifying the peak load to increase efficiency. “We came up with the principle that we could utilise a 95% peak load to minimise the equipment size and optimise the project costs,” explained Phil Draper, managing director of 21 Engineering. “We looked at controlling the building on a demand-driven strategy, which means that the building isn’t allowed to get cold, and that reduces the time needed to heat it and
maximises the efficiency of heat pump technology.” Following the project design, two other main
challenges had to be addressed: (1) limited roof space and (2) installing the new heating system in a fully operational building. A structural survey of the rooftop was carried out, and the installer, Nationwide Air Conditioning, 3-D modelled the pipework and surrounding areas to ensure the units fit. Geoff Broughey, senior technical services manager
for British Land and York House, explained: “We decided to complete the works within normal office hours, so nearby apartments weren’t disturbed, which meant the office building was fully occupied. Most of the work occurred on the roof, so the building occupants weren’t aware.”
The Mitsubishi Electric heat pump chillers are also helping British Land to reuse waste heat from the process to heat the building and minimise energy consumption. The four-pipe heat pumps use R513A, a refrigerant with a lower global warming potential (GWP). Using R513A has also helped British Land get the Energy Performance Certificate (EPC) rating for the building as high as possible. Daniel Valente, head of projects for Nationwide Air Conditioning summarised the challenge. “The unique aspect of this project was that we had no hydronic separation and a much lower capacity on the water- to-water side so that we only injected the amount of heat required to give the building the load required during the winter months. “The benefits to this were higher operational efficiencies, lower initial capital costs and a simpler installation.”
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www.heatingandventilating.net
February 2025
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