After following the threads about heating settings, a few questions have come up for me as well.
A few years ago, I mostly disabled the ERR on my heat pump, adjusted the heating curve, and set the desired temperatures via the flow rate.
This allowed me to significantly reduce consumption, and I have been quite satisfied with it for the past 3-4 years.
In total, I consume around 2600-2800 kWh for heating, domestic hot water, and the remaining ERR. (House living area about 125m² (1350 sq ft), 3 people)
What I didn’t pay attention to back then was how short or long the heating circuits are and whether I create a hydraulic shortcut or not.
I also didn’t monitor the number of cycles and cannot evaluate that.
Brief info about the heat pump
We have a direct evaporator with ground collectors and a stratified storage tank from Lüumel.
The direct evaporator operates somewhat differently than conventional heat pumps.
The stratified storage tank serves as both a buffer and a domestic hot water heater.
In the stratified tank, water is heated to different temperatures in various layers. The lower and middle parts typically have heating temperatures, while the upper part is significantly hotter due to using the heating gas.
The domestic hot water flows through a heat exchanger in the stratified tank and is heated to the domestic hot water temperature.
For the underfloor heating, water is drawn from the middle layer and returned to the bottom.
The heat pump itself is controlled by the supply temperature.
Question 1
With the stratified/buffer tank and the supply temperature control of the heating system, do I have a problem with hydraulic shortcuts at all? Or is it irrelevant since the water mixes first in the manifold and later in the buffer, meaning a short circuit such as from the guest bathroom has no impact?
Question 2
In the heating system description, I found the following sentences:
Does this mean that cycling is actually useful and intended here?
A few years ago, I mostly disabled the ERR on my heat pump, adjusted the heating curve, and set the desired temperatures via the flow rate.
This allowed me to significantly reduce consumption, and I have been quite satisfied with it for the past 3-4 years.
In total, I consume around 2600-2800 kWh for heating, domestic hot water, and the remaining ERR. (House living area about 125m² (1350 sq ft), 3 people)
What I didn’t pay attention to back then was how short or long the heating circuits are and whether I create a hydraulic shortcut or not.
I also didn’t monitor the number of cycles and cannot evaluate that.
Brief info about the heat pump
We have a direct evaporator with ground collectors and a stratified storage tank from Lüumel.
The direct evaporator operates somewhat differently than conventional heat pumps.
The stratified storage tank serves as both a buffer and a domestic hot water heater.
In the stratified tank, water is heated to different temperatures in various layers. The lower and middle parts typically have heating temperatures, while the upper part is significantly hotter due to using the heating gas.
The domestic hot water flows through a heat exchanger in the stratified tank and is heated to the domestic hot water temperature.
For the underfloor heating, water is drawn from the middle layer and returned to the bottom.
The heat pump itself is controlled by the supply temperature.
Question 1
With the stratified/buffer tank and the supply temperature control of the heating system, do I have a problem with hydraulic shortcuts at all? Or is it irrelevant since the water mixes first in the manifold and later in the buffer, meaning a short circuit such as from the guest bathroom has no impact?
Question 2
In the heating system description, I found the following sentences:
During pause periods, evaporation continues in the collector or probe even though the heat pump is off.In the settings, there is also an option for the maximum runtime, after which the heat pump turns off temporarily.
Additionally, condensation continues in the storage tank.
This continued evaporation and condensation increase the efficiency of the heating system and thus save your heating costs.
For this reason, pause periods longer than 5 minutes are recommended.
Does this mean that cycling is actually useful and intended here?
Question 1: To answer that, one would need the hydraulic diagram of your system.
Question 2: It only states that pauses should last longer than 5 minutes. In other words, the system should not constantly operate in an on/off cycle but also have rest periods. Nothing is mentioned about the duration of the cycles.
Question 2: It only states that pauses should last longer than 5 minutes. In other words, the system should not constantly operate in an on/off cycle but also have rest periods. Nothing is mentioned about the duration of the cycles.
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