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The Energy House in Cambridge  Elliotts have recently installed an air source heat pump into a 1930’s detached house to demonstrate and test the efficiency of such a system.  The Energy Show House The Energy Show House was built in 1930 and extended in 1991. The house has cavity wall and loft insulation. The heating is by radiators, three of which were upgraded during the installation as these areas were always cold when the house was heated by gas. Energy Efficient Monobloc Heat Pump A Delonghi high temperature monobloc air-source heat pump model AW HT 004 IMS 14.9 kw single phase was installed in September 2011 and has proved very effective at producing hot water and effectively heating this 200 m2 house. This particular system was chosen as it has a 65 ºC maximum temperature and will operate down to minus 20 ºC. It has a maximum efficiency of 415% compared to a gas or oil boiler with a maximum efficiency of about 90%. The system comprises a monobloc heat pump feeding into a 300 litre hot water tank with a buffer tank located in the loft, backed up with a 0 to 6 KW inverter-driven ecoamp water heater. What does the system comprise of?
How is the heat pump controlled? The system is set up to run using Weather Compensation. The advantage of weather compensation is that it optimises the heating water flow temperature at different outdoor temperatures, ensuring the heat pump does not produce unnecessarily high hot water temperatures. For example, when it is not very cold outside in the spring and autumn, the water temperature reaching the radiators needs only to be heated sufficiently high to keep the house to the set temperature of 22 ºC - minimising the amount of energy used by the heat pump. When it is very cold outside - during the winter - the water temperature reaching the radiators needs to be much higher to maintain 22 ºC and therefore the heat pump will work harder to produce water at higher temperatures. The system does this automatically as it constantly monitors temperatures outside and inside the house, which makes it possible to obtain a higher COP and thus use less electricity and less Carbon Dioxide Keeping real homes really warm So far – as of December 2011 - we have had some seriously cold nights and the system has performed extremely well. The house can be visited by appointment. Please telephone 01954 20 20 20
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