CIBSE AWARDS | UCL 22 GORDON STREET MEP strategy Multiservice chilled beam: n Fresh air supply (CO2 control) n Space cooling and heating n Luminaire (LED) n Presence detector n Smoke detector n Speaker LV switch room New substation Basement mechanical plantroom 1 Approximately 400m2 PV panels on roof 2 Air-cooled chiller (CHW circuit for AHU and FCU cooling coils 6-12C 3 Raised CHW circuit for chilled beams 14/18C 4 Air handling units (energy recovery by twin wheels) 5 Fan coil unit serving ground-floor exhibition space and entrance lobby 6 Fan coil unit serving workshops 7 Air handling unit (heat recovery) 8 LTHW plate heat exchangers 9 Domestic cold water break tank 10 Incoming UCL district heating 11 Incoming mains water 12 Incoming HV power 13 Ring main unit and transformer 14 LV switch panel 15 Openable windows in office: natural ventilation in mid-season The buildings original concrete structure has been left exposed ...and the interior designed to provide flexible teacing spaces Stale air is extracted adjacent to the lift core on each floor, where the service risers are located. The air is ducted to a roof-mounted AHU. This incorporates twin thermal wheels to allow humidity to be transferred from the fresh air to the exhaust air while enabling energy recovered from the exhaust air to be transferred to the supply air. The thermal wheels ensure increased heat recovery in winter and free re-heat of the supply air after it has been dehumidified in the summer, explains Hamada. Heat for the buildings space heating and domestic hot water comes from UCLs district heat network via a LTHW plate heat exchanger in the basement plantroom. Our team developed a building services design that offers a flexible, low-energy and comfortable environment for the occupants, which when coupled with good levels of daylight and healthy material choices provides healthy and productive teaching spaces, says Hamada. Heating and cooling loads are kept to a minimum by the buildings new faade. Its design is based on what Hamada terms a passive first approach because of its thermally efficient glazing and the high levels of insulation. This enables it to exceed Part L 2013 U-values, even though the scheme was certified under Part L 2010. The building achieved an onsite airtightness of 8m3.h-1.m-2)@50Pa and an as-constructed EPC rating of B(41), equivalent to a 30% reduction over Part L 2010. The building was occupied in January 2017. Seasonal commissioning was carried out in winter, mid-season and during peak summer conditions. One of the issues identified during commissioning was condensation forming on the chilled beams at a random time of day. Investigation showed that this was down to a fault on the chillers control software, which meant the chilled water flow temperature reset to default low temperature. The chiller was subsequently reprogrammed and is now operating at predicted design flow and return temperatures. A Building Use Survey (BUS) was carried out among staff and students in April 2018, more than a year after the building was first occupied. This identified two aspects of the building performance where user comfort needed to be 34 April 2020 www.cibsejournal.com CIBSE Apr20 pp32-35 22 Gordon Street.indd 34 20/03/2020 16:45