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Worcestershire Business New Green Heating Saves 60%

04 June 2012Air Source Heat PumpSolar Photovoltaic

Mr A already had a south-facing 8KWp solar PV array installed by Bright Green Renewables on the roof of his company offices in Worcestershire. These old prefabricated offices had no central heating and are poorly insulated. The 25+ staff members used numerous stand-alone electric convector heaters to heat the offices throughout the winter (and these were often left running overnight). Due to the flat roof structure of the offices they also become unbearably hot in the summer and portable air conditioning units were frequently hired to help cool the buildings. The costs to provide heating and cooling all year round were becoming prohibitively high and the electrical supply capacity of the building was approaching its limit.

The Solution

Bright Green Renewables surveyed the property and conducted an in-depth heat loss analysis to help specify a heat pump and corresponding low temperature heat emitters. It was proposed that water operated ceiling cassettes and fan coil units be installed at key locations around the offices in order to provide heating around the premises. It was also proposed that a reversible heat pump be specified which would also allow cooling of the offices in the summer. This was operated via a 200L insulated buffer vessel.

The proposed system allows centralised control of the heating and cooling loads and prevents wastage at night from appliances that aren’t switched off. The system also allows him to benefit from the electricity being generated by his 8KWp solar PV array. When the PV system is providing a high output in the summer months he can run his water-based air conditioning system for free. The heat pump was located out-of-sight at the side of the office block and has been programmed to run in weather-compensation mode to maximise operating efficiency and minimise running costs.

The Installation

In early September 2011 the heat pump, buffer vessel, fan coils, ceiling cassettes and installation accessories were delivered to site. Using his internal workforce the ceilings and walls were cut out and the fan coils and ceiling cassettes installed over the period of 2 weekends. In parallel with this the Bright Green plumbing and electrical teams installed and configured the heat pump and 200L buffer vessel and had the new system operational and commissioned in 3 working days.

The Benefits

Mr A has already reported significantly improved comfort levels all around the offices as there is now locally controllable heating and cooling control in all areas. A quick analysis of electricity consumption has identified that he is saving around 60% compared to his old heating bills. In combination with the output of his solar PV array the net running costs will be closely monitored over the coming summer and winter months.


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