Mini HPWH

IdleMind · 11-15-16, 06:37 AM

Ron-thanks for the tip on the temp logger, I have some old computers that could be dedicated to this project so I should look into that. For now, I have a system that works good for me. I read and enter the data in the order it appears on the spread sheet. I have a lookup table in the spreadsheet so the TofP1 & TofP2 cells are filled with a lookup function. Then the SH, SC, and delta P cells are auto calculated. The COPstep4 is also calculated and gives a rough indication of how efficiency varies with time and tank temperature.

The odd temp results have been a puzzle to me for a long time. For example look at the 20 min data. The gas going from compressor to condenser is 130F at 292psi with a saturation temp of 140F. Seems to indicate that it is already starting to condense. The 16 F SC tells me the that it has fully condensed to liquid when it exits the condenser so that that seems about right.

It is possible that a bigger fan would raise the temp into condenser above the saturation temp which might help.

11-15-16, 06:37 AM	#39
IdleMind Helper EcoRenovator Join Date: May 2016 Location: SE Wisconsin Posts: 55 Thanks: 3 Thanked 14 Times in 10 Posts	Ron-thanks for the tip on the temp logger, I have some old computers that could be dedicated to this project so I should look into that. For now, I have a system that works good for me. I read and enter the data in the order it appears on the spread sheet. I have a lookup table in the spreadsheet so the TofP1 & TofP2 cells are filled with a lookup function. Then the SH, SC, and delta P cells are auto calculated. The COPstep4 is also calculated and gives a rough indication of how efficiency varies with time and tank temperature. The odd temp results have been a puzzle to me for a long time. For example look at the 20 min data. The gas going from compressor to condenser is 130F at 292psi with a saturation temp of 140F. Seems to indicate that it is already starting to condense. The 16 F SC tells me the that it has fully condensed to liquid when it exits the condenser so that that seems about right. It is possible that a bigger fan would raise the temp into condenser above the saturation temp which might help.