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Worcester Greenstore Ground Source Manual

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ENERGY MEASUREMENT
6 720 802 172 (2012/06) 5
Fig. 2 Heat pump description
[1] Collector circuit pump
[2] Evaporator
[3] Compressor
[4] Condenser
[5] Heat pump domestic hot water cylinder
[6] Floor heating
[7] Radiator
[8] Heat pump
[9] Heat carrier pump
[10] Expansion valve
[11] Borehole
[12] Geothermal heating coil (horizontal loop/compact collector)
• The collector circuit fluid, which is a mixture of water and anti-freeze,
circulates in the borehole/geothermal heating coil in a plastic hose.
The fluid collects stored solar energy and with the help of the collector
circuit pump leads it into the heat pump and to the evaporator. The
temperature is then approximately 0 °C.
• In the evaporator the collector circuit fluid meets the refrigerant. The
refrigerant is then in a fluid state and is at approximately -10 °C. When
the refrigerant meets the zero degree heat transfer fluid, it starts to
boil. Vapour forms and is led into the compressor. The temperature of
the vapour is approximately 0 °C
• In the compressor, the pressure on the refrigerant increases and the
temperature of the vapour rises to approximately +100 °C. The hot
vapour is then forced into the compressor.
• In the condenser the heat is transferred to the house heating system
(radiators and underfloor heating) and the hot water system. The
vapour cools and liquefies. The pressure in the refrigerant is still high
when it is led on to the expansion valve.
• The pressure of the refrigerant is reduced in the expansion valve. The
temperature also drops to approximately -10 °C. When the refrigerant
passes the evaporator it changes to vapour again.
• The collector circuit is led out from the heat pump to the borehole/
geothermal heating coil to collect new stored solar energy. The
temperature of the fluid is then approximately -3 °C.
6 ENERGY MEASUREMENT
The control unit has the ability to measure the amount of energy that is
produced by the heat pump unit. The calculation assumes that, for
example, the heat pump is correctly installed and that the flow and
temperatures on the hot and cold sides are adjusted as recommended.
The value should therefore be regarded as an estimate of the actual
emitted output. The margin of error in the calculation is normally put at
5-10%.
In addition, the energy output is affected by the outdoor temperature,
the settings for the thermostat and room controls and heat pump usage.
Ventilation, indoor temperature and hot water demand can play a
decisive role.
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6 720 614 540-02.3I
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