Gebwell Aries 12, Installation And Commissioning Manual

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2 GROUND SOURCE HEAT
AND GROUND SOURCE
COOLING
A well-designed ground source heating system with the
correct power values offers low operating costs and good
energy efficiency. The ground source heat pump enables
you to efficiently heat your indoor air and domestic hot
water. In the summer, the system can also cool indoor air
in an environmentally friendly way.
2.1 Heat from the ground
The ground source heat pump collects heat from the
ground and brings it into the building. Heat can be
collected using either a network of pipes embedded in a
bored well, a heat collection pipe network installed close
to the soil surface, or a network of pipes anchored to the
bottom of a body of water.
Bored well as a heat source
Soil as a heat source
Watersystem as a heat source
Further information about heat collection systems and
their designs can be found on the websites of Gebwell Ltd.
and the Finnish Heat Pump Association (SULPU).
www.gebwell.com
www.sulpu.fi
2.2 Ground cooling
The low temperature of the brine can also be used to cool
your home. In the summer, free cooling energy can be
transferred from the ground using only a water circulation
pump. The ground source heating system can be
connected to the ventilation fan convector or an
underfloor heating/cooling system designed for cooling.
2.3 Operating principle of a heat pump
The heat pump consists of four main components

Evaporator

Compressor

Condenser

Expansion valve
The solar energy stored in the soil is collected by the brine
circulating in the heat collection pipe networks.
In the evaporator, the energy contained in the brine is
transferred to the refrigerant, which absorbs the heat
energy as it evaporates. The brine returns to the ground
approximately 3°C cooler than when it came. The brine
entering the heat pump can be no colder than -5°C.
The pressure and temperature of the refrigerant increase
in the compressor. The refrigerant also absorbs the heat
energy created by the compressor’s work.
The warm refrigerant is transferred into the condenser.
The condenser transfers the heat energy from the
refrigerant into the water circulating in the house’s heating