Manual Worcester Greenstore System (page 5 of 26) (English)

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How the heat pump works

The heat pump has been manufactured for easy and reliable use as well as to provide your house with inexpensive and

environment friendly heating. The easiest way to describe how a heat pump works is to say it works like a refrigerator, but

in reverse. In a refrigerator, heat is moved from the inside to the outside. In a heat pump, heat stored in the ground, rock

or water, is moved into the house. The heat pump collects the stored solar energy. The heat is transferred into the house

via a collector system. The temperature is then increased in the heat pump and the heat is distributed to the house heating

system.

The heat pump collects stored solar energy

Boiling point in relation to the

pressure:

The boiling point of different liquids

varies with pressure, the higher the

pressure, the higher the boiling point.

For example, water boils at +100ºC

at normal pressure. Double the pres-

sure and water boils at +120ºC. Half

the pressure and water then boils at

+80ºC. The refrigerant in the heat

pump acts in the same way, the boil-

ing point changes when the pressure

changes. However, the boiling point of

the refrigerant is as low as approxi-

mately -40ºC at atmospheric pressure.

Consequently, it is also suitable for

low heat source temperatures.

Note

Rock heat Soil heat Lake heat

The heat pump consists of four main parts:

1. Evaporator

The evaporator turns the refrigerant to gas and transfers heat from the

heat transfer ﬂ uid to the refrigerant circuit.

2. Condenser

The condenser turns the vapour to ﬂ uid again and transfers the heat to

the heating system.

3. Expansion valve

Lowers the pressure of the refrigerant.

4. Compressor

The compressor increases the pressure and temperature of the

refrigerant.

These four main parts are linked in three circuits. A refrigerant circulates

in the heat pump, which in some parts of the circuit is in a liquid state and

in other parts in a gaseous state. Read more about the properties of the

refrigerant in the text box to the right.

See the detailed description of the technologies used in the heat pump on

the next page.

Technology in and around the heat pump

How the heat pump works

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Worcester Greenstore System Manual

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