Kensa Heat Pumps Shoebox Heat Pump, Руководство пользователя

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Shoebox Heat Pump Operational Manual Version 2.1
Page 6 of 20
A ground source heat pump (GSHP) extracts heat from the ground by circulating a cold solution of water
and antifreeze (brine) around pipes buried in the ground. As these pipes are buried below 1m in depth,
where the temperature of the ground remains pretty constant (8 to 10
o
C), heat is absorbed from the
ground into the fluid (approximately 5
o
C). This brine is then passed through one side of a heat exchanger
(called the evaporator) and a refrigerant through the other. The refrigerant has a very low boiling point
and by absorbing the energy in the brine this causes the refrigerant to evaporate.
The refrigerant gas is then passed through a compressor where its pressure is increased which in turn
increases its temperature. This high pressure hot gas then flows around a second heat exchanger (called a
condenser) with the heating distribution fluid passing through the other side of the heat exchanger.
Energy is then transferred from the refrigerant into the heating distribution system; this in turn causes the
refrigerant to condense.
This high pressure cold refrigerant is then passed through an expansion valve (or throttle) and the
pressure is reduced. The whole cycle is then repeated.
GSHPs are an extremely energy efficient technology, with every unit of electricity used (to drive the
pumps and compressor) producing between 3 and 4 units of heat.
The Kensa ’shoebox’ heat pump is designed to provide a low cost renewable heat source for a buildings
heating system. It is ideally suited to multi flat developments using a communal ground borehole field. In
addition, and if required, the Kensa Shoebox can also provide domestic hot water. Heat pumps can provide
lower running costs and will generate significantly lower carbon emissions compared with traditional fossil
fuels.
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Fig 2. A shoebox heat pump