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Council tax payers get a profit, there’s a CO2 reduction and affordable homes are available in the borough


a ‘cold roof’ design, with loft insulation above the ceiling but none in the eaves. The lofts provide essential cold storage space for the inverters, which convert electricity from the photovoltaic cells on the roof from direct sunlight into alternating current and must be kept cool. Doors and windows are triple-glazed. Each pair of semi-detached houses has


a 7kW peak photovoltaic (PV) array on the roof. Thameswey will own the electricity generated and sell it back to the occupiers at a profit, as well as claiming a feed-in tariff through the government. Only the two market-price, five-bedroom houses have solar thermal panels for hot water, in addition to their PV, because of a lack of roof space. The PV panels are integrated with ceramic slates. Walter says the slates do not overlap and aluminium strips are placed beneath them to keep the roof watertight. This saves around 30% on materials and embodied energy. Space heating comes from a mixture of occupiers’ body heat and an underfloor heating system, fed by hot water from a


small gas boiler of just 40.3k Btu/hr. There is a thermostat in each room to control the internal temperature; it takes around 24 hours for the underfloor heating to deliver a marked change in room temperature, which Walter says discourages the common but wasteful practice of frequent adjustments. The houses have mechanical ventilation with heat recovery to prevent condensation problems caused by the air tightness. Rainwater is harvested and stored in


5,000 litre tanks, one for each house, which supply water for the toilets, washing machines and garden hosepipes. Walter says enough should be harvested to meet all of a family’s non-drinking water needs. Consumption of potable water is limited to 80 litres per person, per day, using reduced flows on the showers and wash basins. For example, the kitchen sinks will deliver no more than four litres of water per minute, and the showers six litres. Walter claims that most of the energy-


saving features are almost impossible for the occupiers to interfere with. He spends time with each occupier to explain how


THE EXPERTS IN COMMERCIAL SHOWERING & WASHROOM CONTROLS


RADA V10


SHOWER MIXER DESIGNED TO PERFORM ENGINEERED TO LAST


 Longevity  Robustness  


Rada V10 is engineered to perform flawlessly under the heaviest use. And, if necessary, abuse. Its tough cartridge stops have been tested to destruction over a quarter of a million cycles and proven in use in numerous field trials. And just like every Rada product, the V10 is precision manufactured to uncompromising quality standards.


For more information visit www.radadigital.co.uk/v10 Or telephone 0844 879 3733 quoting reference RADA CJ6


42


CIBSE Journal June 2011


www.cibsejournal.com


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