EN-42
Glossary
DUT, dimensioned outdoor temperature
The dimensioned outdoor temperature differs depending on
where you live. The lower the dimensioned outdoor
temperature, the lower the value should be selected on
"selecting a heat curve".
Efficiency
A measurement of how eective the heat pump is. The higher
the value is the better it is.
Electrical addition
This is electricity that, for example, an immersion heater uses
as addition during the coldest days of the year to cover the
heating demand that the heat pump cannot manage.
Filtering time
Indicates the time the average outdoor temperature is calculated
on.
Flow pipe
The line in which the heated water is transported from the heat
pump out to the house heating system (radiators/heating coils).
Heat exchanger
Device that transfers heat energy from one medium to another
without mixing mediums. Examples of different heat
exchangers are evaporators and condensers.
Heat factor
Measurement of how much heat energy the heat pump gives
o in relation to the electric energy it needs to operate. Another
term for this is COP.
Heating curve
The heating curve determines which heat the heat pump is to
produce depending on the temperature outdoors. If a high value
is selected, this tells the heat pump that it must produce a lot of
heat when it is cold outdoor temperature in order to achieve a
warm indoor temperature.
Heating medium
Hot liquid, usually normal water, which is sent from the heat
pump to the house climate system and makes the accommodation
warm. The heating medium also heats the hot water through
the double jacketed tank or coil tank.
Heating medium side
Pipes to the house’s climate system and condenser make up the
heating medium side.
Mixing valve
A valve that mixes the cold water with the hot water leaving
the heater.
Outside sensor
A sensor that is located outdoors. This sensor tells the heat
pump how hot it is outdoors.
Glossary
Additional heat
The additional heat is the heat produced in addition to the heat
supplied by the compressor in your heat pump. Additional
heaters can be for example, immersion heater, electric heater,
solar power system, gas/oil/pellet/wood burner or district
heating.
Calculated flow line temperature
The temperature that the heat pump calculates that the heating
system requires for an optimum accommodation temperature.
The colder the outdoor temperature, the higher the calculated
supply temperature.
Circulation pump
Pump that circulates liquid in a pipe system.
Climate system
Climate systems can also be called heating systems. The
building is heated using radiators, under floor coils or
convector fans.
Compressor
Compresses the gas state refrigerant. When the refrigerant is
compressed, the pressure and the temperature increase.
Condenser
Heat exchanger where the hot gas state refrigerant condenses
(cooled and becomes a liquid) and releases heat energy to the
house heating and hot water systems.
COP
If a heat pump has COP of 5, this means that you only pay for
a fth of your heating demand. This is the eciency of the heat
pump. This is measured at dierent measurement values, e.g.:
7 / 45 where 7 stands for the outdoor temperature and where 45
stands for how many degrees the supply temperature is
maintaining.
Disturbances in comfort
Disturbances in comfort are undesirable changes to the hot
water/indoor comfort, for example when the temperature of the
hot water is too low or if the indoor temperature is not at the
desired level.
A malfunction in the heat pump can sometimes be noticed in
the form of a disturbance in comfort.
In most cases, the heat pump notes operational interference and
indicates this with alarms and shows instructions in the display.
Domestic hot water
The water one showers in for example.
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