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Showing results for tags 'ashp and dhw'.
Found 3 results
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Been doing some experiments which are still ongoing. During the tests below cloudy sky and PV generation 0.5kW throughout. Heating a 160L cylinder with ASHP from 42 to 45, I seemed to use around 2kWh of electric to drive the heat pump from main import meter. The heat pump is 6kW. The theoretical energy input required in the cylinder is 0.6kWh for that temp rise. So on the face of it doesn't look anywhere near efficient. I my be getting good efficiency at the heat pump end making hot water but the conversion to hot water in the cylinder not so good. Experiment 2 Boost cylinder immersion on for 15mins. Temp rise recorded from 45 to 48 for that period. Electric meter didn't change reading. It's a 3kW immersion, so should have used 0.75kWh. Immersion seems to give a close approximate to energy in verses energy out. The heat pump seems to loose out in its conversation when transferring heat to cylinder. What are other people finding with their systems?
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Intro: We are (soon) building a Potton SIPS, 2 storey, pretty conventional house in north Wiltshire. It will have ASHP, MVHR, 3.6kW in roof PV. Data: 185 sq m floor @0.15, 210 sq
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Has anybody fitted one of the combined DHW and ASHP units? Was at NEC show last week and saw a unit made by Haier - CURV - HP200M3 that seems a neat solution optimised for DHW use. For my set-up the air inlet could be linked to a bathroom and would replace a wall mount extractor fan and allow the unit to recover heat from extracted air as input to DHW as well. It would also allow main ASHP to be smaller and used only for UFH. Any experience good or bad welcome.
