Original message
| welshboy
 |  "Heat pump water input temperature"
, posted Thu 29 May 08:00  
I want to extract the btus from large quantity of water say 900 gallons at 30c and raise it a bit into 250 gallons at say 45c using a keram wrb09 water to water heat pump.The refrigerant is either r22 or r407c . In liquid form the input water temperature maximum is 30celsius or in gas form with a mop 15c- Can anyone explain what the actual input temperature of the water limit is for efficiency and how significant this is for the cop ? Assume I am an idiot and explain simply
Help please
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Replies:
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| Jojo98
|  "Re(1):Heat pump water input temperature"
, posted Fri 30 May 15:02
If you are trying to increase water temp fro 30degC to 45degC with a R22 water source heat pump, I don't think you will be able to accomplish this. On most R22 systems you want no more than 35degC leaving water temp, much high than that and youy start degrading unit performance and life. The 30degC entering water would be satisfactory. A basic rule of thumb is 10degF to 15degF temp split between entering and leaving water.
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| Jojo98
| "Re(1):Heat pump water input temperature" , posted Fri 30 May 15:02:
Forgot to mention, it won't take long to run out of the 900gal, especially if you are going to use the H/P for cooling. Also do you intend to use the machine in Heat Pump mode?
[this message was edited by Jojo98 on Fri 30 May 15:04] |
| | welshboy
| "Re(2):Heat pump water input temperature" , posted Sat 31 May 10:02
Hi thanks for that I have since found out from Keram technical that the refrigerant is r407c and that the maximum input temperature on the water in side is 20c. I was thinking about recycling the water until I had extracted all the btus down to about 12c. This 900 gallons of solar would only be a t off from the ground loop side and we live in a fairly mild climate in winter but the ground loop would be used alone once the days were too short to produce meaningful heat. As far as your cooling point is concerned I only wish it was needed ! our summers are pretty cool and there is a bigger chance of it being needed in heating mode in summer than cooling. Does the refrigerant make any difference to your stress point lifecycle ?
Keram say 55c is the maximum of the heated water side of the pump.
Once again thanks for your posting
Help please
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