AndyHX
24-08-2010, 09:10 AM
Hi all heat pump enthusiasts !
I have a few questions about design of hotwater heatpumps for domestic hot water . I was thinking of modifying an A/C unit , i have 2 PHE which match the units heating capacity. If i use the first one as condenser and have a water regulating valve to control head pressure and temperature out , and then liquid going into second phe and the coldest water from cylinder subcooling this further.
The other way is no regulating valve and circulate water through system at high flow and gradually pick up temperature. this would seem to produce a system that would be unstable , i am unsure about the effect of evaporating pressure if condensing pressure is only just above the temp of water out? but i quess you would be getting a higher cop for a start ?
Is one way more efficent in the full cycle of heating up complete cylinder.
If water is gradually getting warmer i will lose my subcooling effect in my sc phe.
So that is why i am favouring the regulated system at moment.
I would appreciate all views on this
cheers Andy
I have a few questions about design of hotwater heatpumps for domestic hot water . I was thinking of modifying an A/C unit , i have 2 PHE which match the units heating capacity. If i use the first one as condenser and have a water regulating valve to control head pressure and temperature out , and then liquid going into second phe and the coldest water from cylinder subcooling this further.
The other way is no regulating valve and circulate water through system at high flow and gradually pick up temperature. this would seem to produce a system that would be unstable , i am unsure about the effect of evaporating pressure if condensing pressure is only just above the temp of water out? but i quess you would be getting a higher cop for a start ?
Is one way more efficent in the full cycle of heating up complete cylinder.
If water is gradually getting warmer i will lose my subcooling effect in my sc phe.
So that is why i am favouring the regulated system at moment.
I would appreciate all views on this
cheers Andy