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www.heatingandventilating.net HEAT A


Social housing AT PUMP SOLUTION BOOSTS BRIS TOL SOCIAL HOUSING


Daikin Altherma Flex installation is catering for tenants’ heating and hot water requirements in a 1960s office block in Bristol which has been


converted into 30 one and two-bedroom flats providing a significant boost to the social housing needs in the area. Overlooking a weir on the River Avon in the city’s St Anne’s area, the three-stor eyWeir House emerged from a £4 million, year-long conversion that dramatically upgraded its appearance and raised it to modern residential standards for thermal insulation. But instead of the electric heating originally specified by the contractors, housing association Merlin wanted a more efficient solution.


Peter Crouch, development manager at Merlin, says: “Electric heating would have given us an SAP rating of 65-67 – well below our corporate target of an average of 80 by 2019. With the Daikin air source heat pumps the SAP rating is 80-plus.


“This is good news not only for the environment, but also for the affordability for our residents who are very cost conscious. The typical electricity bill was estimated at £800 a year if the original electric boilers were used, and this is halved to a predicted £350-£400 a year using the air source heat pump system.”


“With it being our first major refurbishment with new technology in the form of air source heat pumps we are watching with interest the data being received on heating use and energy costs in the block, plus the ease of use for


residents and any ongoing maintenance required,” says Peter. The Daikin Altherma Flex units were installed in a decentralised configuration by Daikin installer Moore of Devizes. Director Les Moore says: “The heat pump condensing units are on a new steel platform on the roof, with hydrobox units and matching hot w ater cylinders in each flat.”


The compact 600 x 695mm footprint of the hydroboxes, with 200 litre cylinders on top, means they can be fitted into airing cupboards to minimise demand on floor space in the 2 and 50m2


45m flats.


The outdoor units are connected to the hydroboxes by primary R410a refrigerant circuits. Secondary R134a refrigerant circuits in the hydroboxes enable them to deliver water at up to 80˚C when necessary for high temperature heating. The hydroboxes also contain all the hydraulic components needed to transfer the air-sourced heat to heating circuits serving radiators and DHW cylinders. Les says: “Tenants have standard third party domestic controllers to turn their systems on and off – and set the room temperatures they want.We ensured they had individual instruction on their systems, so they could get maximum comfort without wasting money on excessive heating.”


In addition to the decentralised installation atWeir House, Daikin Altherma Flex systems can also be centralised, with all the hydroboxes located in a single plant room.


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Deltlta Range - Pressure B        27


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     


    


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The Delta Compact, Delta Basic and Delta Basic Plus from KSB are WRAS approv 


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