Bosch EHP 6-11 LM, User And Installation Manual

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FOR THE USER
This is how your 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,
however, the other way round. 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 a few degrees of the stored solar energy. The
heat is led into the house via a hose. The temperature is then increased in the heat pump and the heat is distributed to the
house’s 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 evaporates the refrigerant to gas and transfers heat
from the heat transfer fl uid to the refrigerant circuit.
2. Condenser
The condenser condenses 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 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 gas state. Read more about the properties of the refriger-
ant in the sidebar 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
This is how your heat pump works