ᐅ Diagram of an air-to-water heat pump system with two storage tanks
Created on: 22 May 2018 00:41
B
bauibaui
Hello,
after deciding to go with an air-to-water heat pump (for now), I’m currently thinking about the (ideal) system layout. There’s a lot of discussion about incorrect temperatures in stratified tanks, using two separate heat pumps for domestic hot water and heating, excessively high flow temperatures, and so on. Conditions: 150 sqm (1600 sq ft) living area, 4 people, underfloor heating, renovated older building from 1965. My idea is as follows:
One heat pump and two storage tanks, one for domestic hot water (200 L (53 gallons)) and one for heating water (300-500 L (79-132 gallons)).
One heat pump that alternately fills the tanks as needed. When heating the storage for the heating system, it runs in an efficient range (flow temperature around 40°C (104°F)), but it is less efficient when heating the domestic hot water tank, since the flow temperature is higher at around 55°C (131°F).
If a photovoltaic system is added, surplus electricity would first be used for heating. If it’s not needed there, the domestic hot water tank could be heated fully—even inefficiently—up to 90°C (194°F). In that case, a mixing valve should be installed at the outlet to reduce the temperature to 50-55°C (122-131°F).
Does anyone already have a system like this in operation? What have your experiences been? Can a heat pump handle this kind of control, or as an electronics engineer do I need to design something myself?
I have space for two tanks, and I think combined stratified tanks and similar setups are neither fish nor fowl.
Regards
bauibaui
after deciding to go with an air-to-water heat pump (for now), I’m currently thinking about the (ideal) system layout. There’s a lot of discussion about incorrect temperatures in stratified tanks, using two separate heat pumps for domestic hot water and heating, excessively high flow temperatures, and so on. Conditions: 150 sqm (1600 sq ft) living area, 4 people, underfloor heating, renovated older building from 1965. My idea is as follows:
One heat pump and two storage tanks, one for domestic hot water (200 L (53 gallons)) and one for heating water (300-500 L (79-132 gallons)).
One heat pump that alternately fills the tanks as needed. When heating the storage for the heating system, it runs in an efficient range (flow temperature around 40°C (104°F)), but it is less efficient when heating the domestic hot water tank, since the flow temperature is higher at around 55°C (131°F).
If a photovoltaic system is added, surplus electricity would first be used for heating. If it’s not needed there, the domestic hot water tank could be heated fully—even inefficiently—up to 90°C (194°F). In that case, a mixing valve should be installed at the outlet to reduce the temperature to 50-55°C (122-131°F).
Does anyone already have a system like this in operation? What have your experiences been? Can a heat pump handle this kind of control, or as an electronics engineer do I need to design something myself?
I have space for two tanks, and I think combined stratified tanks and similar setups are neither fish nor fowl.
Regards
bauibaui
Oh right, I thought it was clear since I had just mentioned the hot water tank. This value is from early August to early May, so for about 210 days. There are two of us, and we hardly use any hot water, even with occasional longer showers and the occasional bath. It’s probably different if you have a rain shower and bathe every other day, but neither applies to us.
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