T_im_Norden
2020-07-09 10:04:04
- #1
The heat pump can only respond based on the supply or return temperature as well as the outside temperature; it has no idea what the temperature is in the rooms or whether valves are open or closed.
This means that as soon as the temperature in only one room decreases and the supply temperature falls below the required value, the heat pump runs.
The less heating water is circulating, the faster the supply temperature reaches the setpoint and the heat pump switches off.
However, since the small amount of water also cools down faster, the heat pump has to start up again more quickly.
The result is then many starts per day.
Since modern heating systems control the pumps independently of the heating, a higher water volume also means that the heat pump can run longer at low power and the times when it does not have to heat are also longer.
In a well-coordinated system, this leads to single-digit start numbers per day.
Therefore, it is better to use modulating heating systems with the lowest possible minimum output.
By switching off, the thermostats simultaneously prevent heat that is too much in the room from being absorbed and then released again in other rooms.
Most systems today are controlled by outside temperature with supply temperature regulation.
The heat pump begins to heat when the supply temperature falls below the set temperature (with a certain tolerance of a few degrees).
If the thermostats in some rooms now shut off the flow, the volume flow and mass decrease.
If the flow falls below the minimum amount, it may happen that the heat pump cannot dissipate its heat quickly enough and reports a fault.
In air-water heat pumps, this can lead to the defrosting process failing.
To prevent this, buffer tanks are often installed, which, however, are efficiency killers.
This means that as soon as the temperature in only one room decreases and the supply temperature falls below the required value, the heat pump runs.
The less heating water is circulating, the faster the supply temperature reaches the setpoint and the heat pump switches off.
However, since the small amount of water also cools down faster, the heat pump has to start up again more quickly.
The result is then many starts per day.
Since modern heating systems control the pumps independently of the heating, a higher water volume also means that the heat pump can run longer at low power and the times when it does not have to heat are also longer.
In a well-coordinated system, this leads to single-digit start numbers per day.
Therefore, it is better to use modulating heating systems with the lowest possible minimum output.
By switching off, the thermostats simultaneously prevent heat that is too much in the room from being absorbed and then released again in other rooms.
Most systems today are controlled by outside temperature with supply temperature regulation.
The heat pump begins to heat when the supply temperature falls below the set temperature (with a certain tolerance of a few degrees).
If the thermostats in some rooms now shut off the flow, the volume flow and mass decrease.
If the flow falls below the minimum amount, it may happen that the heat pump cannot dissipate its heat quickly enough and reports a fault.
In air-water heat pumps, this can lead to the defrosting process failing.
To prevent this, buffer tanks are often installed, which, however, are efficiency killers.