Energycount - Dorset - SAP Calculations - SBEM Calculations - Part L - EPC - Renewables Reports - Energy Statements
Energycount - Dorset - SAP Calculations - SBEM Calculations - Part L - EPC - Renewables Reports - Energy Statements
Energycount - Dorset - SAP Calculations - SBEM Calculations - Part L - EPC - Renewables Reports - Energy Statements
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ASHP (Air Source Heat Pump)


ASHP diagram underfloor heating

As the name suggests, ASHPs take energy from air.

COP (Coefficient of Performance) for ASHP ranges from 2.5 to 4, depending in the system used. SAP uses an assumed efficiency of 250% (COP 2.5) for ASHPs (i.e. the heat energy provided by the system is 2.5 times that of the energy used to power the system). It should also be noted that 250% is rather conservative, although does consider seasonal variation.

There are two main types of Air Source Heat Pumps:

ASHP Air Source Heat Pump exterior unit (Daikin)

Air-to-Water
This is the most common system. A compact unit is fixed to the exterior of the house, most commonly the rear or side of the property (the unit looks much like an air conditioning unit), which passes heated refrigerant (warmed by taking heat from the outside air) to an internal unit containing the cylinder, expansion vessel and electric heater. The internal unit raises the temperature to heat domestic hot water and water-based heating systems. Back-up heating is provided by an integral electric heating.

Air-to-Air space heating
Just like the air-to-water system, a compact unit is fixed to the exterior of the house, which passes heated refrigerant (warmed by taking heat from the outside air) to an internal unit. The internal unit raises the temperature to heat air, which is blown into the building. Air-to-air systems can be reversed to act as air conditioning in warmer months.

Exhaust Air Heat Pump
A mechanical ventilation system combined with a heat pump, which extracts air via ductwork connected to the warm areas of the dwelling such as bathrooms, kitchens and utility rooms. Heat is removed from the air and transferred into the heat pump where the temperature is raised to heat the domestic hot water and sometimes to also provide space heating. Bac- up heating is provided by an electric heating unit integral within the system.


 

 

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