European – Air-source heat pump
The purpose of the project was to build a low energy and low cost prefabricated house without compromising the comfort. Due to the overall reduced energy consumption in low energy houses the proportion of the heat required for DHW increases from 30% to 40%. This sets new requirements for a heating system. In this residence there are two air-source heat pumps: one for heating (from October to April) and the other for DHW (DHW; all year round).
|The former uses outdoor air and the latter indoor exhaust air as its heat source. The SPF of the 4.6 kW heat pump for space heating is 3.0. If auxiliaries such as fans for heat recovery and standby losses of the water heater are considered as well the SPF drops to 2.0.|
This case study is based on information from (NTH4). For ordering information see below.
Building and design values
|Building type:||Single-family house|
|Year of construction:||1998|
|Number of storeys:||2|
|Heated floor area (m2):||155|
|% of total floor area (%):||No data (basement unheated)|
|Design outdoor temperature (ºC)||Heating:||-9||Cooling:||–|
|Design indoor temperature (ºC)||Heating:||20||Cooling:||–|
|Degree days||Heating:||3 294||Cooling:||–|
|Base temperature for degree days (ºC)||Heating:||12/20||Cooling:||–|
Heating and cooling (NTH4)