ᐅ How to effectively reduce electricity consumption in heat pump systems with circulation loops?
Created on: 18 Dec 2023 08:54
G
GnadenpinselG
Gnadenpinsel18 Dec 2023 08:54Hello,
the old hot water tank from our oil heating system recently and suddenly broke down. A few days ago, we installed a domestic hot water heat pump (DHWHP) with a capacity of 270 liters (4 persons) (about 71 gallons) in recirculation mode and connected it to the existing hot water circulation system. The circulation line is quite helpful, as otherwise the hot water can take quite a long time to reach the taps. A mechanical timer switch was installed so that the circulation pump does not run for 7 hours at night and is also interrupted for 3 hours during the day.
I have a few general questions and hope you can offer some advice:
1. How can electricity consumption be reduced as effectively as possible when the DHWHP is connected to the circulation line (which is poorly insulated in the house)?
2. According to energy-saving regulations, the circulation pump must run at least 16 hours a day to keep the pipes free from bacteria. Is this really necessary in practice?
3. What is the recommended target temperature for the DHWHP itself? The legionella protection cycle at 62°C (144°F) is set to run once a month.
4. The utility room housing the DHWHP has only about 16 cubic meters (565 cubic feet) of volume. The recommended minimum is 20 cubic meters (706 cubic feet). Forced ventilation (ventilation grille with noticeable fresh air supply) is present due to the oil heating system. However, during extended recirculation operation, the room temperature (normally around 20°C (68°F)) drops noticeably by 5-6°C (9-11°F) down to about 14-15°C (57-59°F), then rises again afterward. Is this acceptable, or should the exhaust air be directed outside to improve the DHWHP’s efficiency?
Thank you very much for your feedback.
the old hot water tank from our oil heating system recently and suddenly broke down. A few days ago, we installed a domestic hot water heat pump (DHWHP) with a capacity of 270 liters (4 persons) (about 71 gallons) in recirculation mode and connected it to the existing hot water circulation system. The circulation line is quite helpful, as otherwise the hot water can take quite a long time to reach the taps. A mechanical timer switch was installed so that the circulation pump does not run for 7 hours at night and is also interrupted for 3 hours during the day.
I have a few general questions and hope you can offer some advice:
1. How can electricity consumption be reduced as effectively as possible when the DHWHP is connected to the circulation line (which is poorly insulated in the house)?
2. According to energy-saving regulations, the circulation pump must run at least 16 hours a day to keep the pipes free from bacteria. Is this really necessary in practice?
3. What is the recommended target temperature for the DHWHP itself? The legionella protection cycle at 62°C (144°F) is set to run once a month.
4. The utility room housing the DHWHP has only about 16 cubic meters (565 cubic feet) of volume. The recommended minimum is 20 cubic meters (706 cubic feet). Forced ventilation (ventilation grille with noticeable fresh air supply) is present due to the oil heating system. However, during extended recirculation operation, the room temperature (normally around 20°C (68°F)) drops noticeably by 5-6°C (9-11°F) down to about 14-15°C (57-59°F), then rises again afterward. Is this acceptable, or should the exhaust air be directed outside to improve the DHWHP’s efficiency?
Thank you very much for your feedback.