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Air Sourced Heat Pump.

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A person today that I was talking to, that has had a new build home which was required by building regs. to have an air sourced heat pump for heating and hot water, complained that the system was slow to heat or cool as required. He said that he had to have underfloor heating installed. It was slow to warm the rooms on cold days. He recently had the system set to cool the rooms on the very hot recent days. But this morning was cooler and he required heating. Is this normal?


Z.
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    Some AHPs require plumbing to an internal heat exchanger and use a low ozone depletion refrigerant. The installer needs to be qualified to work with these gases. The more common AHPs (monoblock) just plumb in to the radiator/hot water circuit via a buffer tank and just have glycol antifreeze as per normal indirect heating. These systems can be easily installed by any competent person. They just comprise a compressor with sealed refrigerant circuit, fan, pump and control circuits. It is recommended that SCOP is used for design as this takes seasonal factors in to account unlike COP. The “new build” would be eligible for RHI payments is it was designed correctly and achieved the required Environmental Performance Certificate. Payments are only payable after all the building envelope details (walls, floors, windows, insulation etc) are submitted and heat loss calculated and deemed acceptable for payment. Therefore if the owner was complaining about the cost is it possible they do not get RHI because the design was deficient?

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    Some AHPs require plumbing to an internal heat exchanger and use a low ozone depletion refrigerant. The installer needs to be qualified to work with these gases. The more common AHPs (monoblock) just plumb in to the radiator/hot water circuit via a buffer tank and just have glycol antifreeze as per normal indirect heating. These systems can be easily installed by any competent person. They just comprise a compressor with sealed refrigerant circuit, fan, pump and control circuits. It is recommended that SCOP is used for design as this takes seasonal factors in to account unlike COP. The “new build” would be eligible for RHI payments is it was designed correctly and achieved the required Environmental Performance Certificate. Payments are only payable after all the building envelope details (walls, floors, windows, insulation etc) are submitted and heat loss calculated and deemed acceptable for payment. Therefore if the owner was complaining about the cost is it possible they do not get RHI because the design was deficient?

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