Environmental Engineering Reference
In-Depth Information
Optional
thermal
solar plant
Warm air inlet
in living-room and
bedrooms
Air outlet
in kitchen,
bathroom,
toilet
Ambient
air inlet
Cold air outlet
Domestic
hot water
store
Optional ground-coupled
heat exchanger for
air preheating
Immersed
electric heater
Eva-
pora-
tor
Compact
heat pump unit
Condenser
air inlet
Condenser
domestic hot water
Fig. 9.14
Heat pump heating system for passive houses equipped with exhaust-air to inlet-
air heat pump for air space heating systems and generation of domestic hot water plus
ground-coupled heat exchanger for air preheating (see /9-15/)
Heating systems with ground-coupled heat pump.
As an example, Fig. 9.15 shows
a heat pump heating system with a horizontal ground-coupled heat exchanger. The
heat pump primarily supplies space heating water in this case. Domestic hot water
generation that would require a higher temperature level, in principle could also
be realised using a heat pump, but also using a separate heater. The heat pump di-
rectly feeds a low-temperature floor heating system. Due to the storage capacity of
floor heating systems, a buffer storage might not be required. Only for an in-
creased demand towards indoor temperature quality (e.g. balancing of temperature
within a building, for example with appropriate solar radiation) or if throttling of
individual heating circuits is required, a buffer storage may be needed. An appro-
priate control device steers the heat pump that is normally run with On/Off opera-
tion - depending on the required space heating inlet temperature and ambient tem-
perature. Due to the high storage mass of the heated building surfaces (e.g. stone
floor, concrete floor) the On/Off operation of the heat pump does not lead to a
loss in comfortable room temperatures.
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