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Daniel-Sp27 Oct 2020 07:55You first need a proper heat load calculation; only after that can you choose the appropriate heating system. The energy performance certificate is not the same as a heat load calculation or heat demand assessment.
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Daniel-Sp27 Oct 2020 08:46Hausmanu schrieb:
Hello!
Our energy performance certificate shows 7.4 kW including hot water. Could that possibly be 7.4 kWh/year?
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Daniel-Sp27 Oct 2020 10:10The screenshot does not indicate whether a proper heating load calculation was performed. Were you asked about your desired room temperature?
I would not accept a bivalence point of -5°C (23°F). This would be the theoretical point where the electric booster heater supplements the system. It heats directly with electricity at a COP of 1.
Choose a heat pump that delivers sufficient output at the design outdoor temperature (NAT) and can modulate its power down as much as possible. It is very important to correctly size the underfloor heating system! For this, you must specify your desired temperature (as well as for the heating load calculation) and the maximum supply temperature. The bathroom is often a problem because the desired temperature there is usually higher and the surface area too small. If necessary, add wall heating. Alternatively, use an electric booster heater decoupled from the heat pump heating circuit. No buffer tanks, no combined storage, no solar thermal, no stove with water jacket. The heat pump must heat directly into the underfloor heating to be efficient.
KNV is (I believe) Nibe.
I would not accept a bivalence point of -5°C (23°F). This would be the theoretical point where the electric booster heater supplements the system. It heats directly with electricity at a COP of 1.
Choose a heat pump that delivers sufficient output at the design outdoor temperature (NAT) and can modulate its power down as much as possible. It is very important to correctly size the underfloor heating system! For this, you must specify your desired temperature (as well as for the heating load calculation) and the maximum supply temperature. The bathroom is often a problem because the desired temperature there is usually higher and the surface area too small. If necessary, add wall heating. Alternatively, use an electric booster heater decoupled from the heat pump heating circuit. No buffer tanks, no combined storage, no solar thermal, no stove with water jacket. The heat pump must heat directly into the underfloor heating to be efficient.
KNV is (I believe) Nibe.
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