Energy Audit for St Mary Redcliffe Church, Bristol

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4.3. Radiators and other heat emitters The heating within the church is supplied via underfloor heating pipes to cast iron column radiators. It is reported that the heating is satisfactory in heating the church. The floor trenches around the church in which the heating pipes run do serve as a source of heat emission. The heat put of these can be substantially improved firstly by lifting the grilles and cleaning out the built up dust and debris within these trenches and then lining the base and sides of the trench with a flexible thermal foil insulation to promote the heat to be emitted up and out the top of the trench through the grille rather than warming the ground beneath. Such insulation rolls are available easily from mainstream DIY stores (http://www.wickes.co.uk/invt/210022) and can work very effectively. The heating system has indications that a Fernox inhibitor has been installed and the water within the radiators was checked and found to be clean. It is recommended that the levels of inhibitor within the system is check annual and part of the boiler service and topped up as required. 10
4.4. Controls and Frost Protection The heating controls to the church are whole inadequate. They currently consist of a time clock which is not in use and a range of on and off switches. The electric immersion heater to the hot water tank is currently switched on so that both gas and more expensive electricity is being used to heat the hot water. There is also a three port valve controlled by an actuator which switches the output of the boiler between the heating and/or hot water. This actuator switch is broken and needs to be replaced to allow for effective control As there is no operating time clock the heating is currently turned on manually in Mid-October and turned off in March. During the winter the heating therefore runs constantly 24 hours a day, 7 days a week. There is some thermostatic control with the use of a Drayton SCR Digistat located in the north side of the choir stalls but it is not clear how this is connected back to modulate the boiler firing. It is strongly recommended that the control panel is replaced with a modern control unit such as a DC1100 controller which includes weather optimisation and has time clocks for heating and separately for hot water. This has an optimiser so will automatically bring on the heating to bring the building up to temperature by the time set within the programmer. There is also frost protection settings on external air temperatures, internal space temperatures and the temperature of the water in the heating pipes so that minimum levels of heating can be maintained for purposes such as the organ. The hot water is currently running constantly as well as having the electric immersion turned on. As the primary use of hot water is for the café and WC’s it is recommended that the hot water is provided for the times when the café is open. Outside of these time the hot water tank will continue to store hot water until it is used up therefore there will still be hot water available in the toilets after the 3pm café closing time. In order to maintain levels of hot water on a Sunday and Monday is it recommend that the hot water comes on for two hours in the morning to heat up the tank. All recommended timings are shown in the table below 11
Page 1 and 2: Energy Audit for St Mary Redcliffe
Page 3 and 4: 2. Church Details St Mary Redcliffe
Page 5 and 6: In comparison with national benchma
Page 7 and 8: 3.1.2. Replace existing lighting wi
Page 9: 4. Heating System Saving Recommenda
Page 13 and 14: 5. Building Fabric While it is ackn
Page 15 and 16: 6. Renewable Energy Feasibility 6.1
Page 17 and 18: 6.2. Micro-Wind Micro wind units re
Page 19 and 20: 7. Summary of Recommendations This

Energy Audit for St Mary Redcliffe Church, Bristol

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