Dxgshpwh (ground source heat pump water heater)

MEMPHIS91 · 06-06-15, 10:35 PM

I think this data will show more about whats going on.
Minutes - Temp F - Watts - Borehole Temp F
00 - 93 - 00 - 63.3
30 - 96.5 - .17 - 60.8
70 - 102 - .43 - 60.8
90 - 104.2 - .57 - 60.8
120 - 107.6 - .77 - 60.8
150 - 11.7 - .97 - 60.6
180 - 114.2 - 1.18 - 60.4
200 - 117.3 - 1.34 - 60.6
230 - 121.4 -1.66 - 60.8

As you can see my borehole temp hit about 60.8 and stayed there even in the hardest part of the cycle. My COP was around 2.08 - 2.37.

Here is the charge info, what I found was that my cap tube size is stopping me from going past 42 psi suction pressure therefore limiting mass flow and forcing my discharge temp and pressure to increase. With more flow I can heat more water faster at a lower amp draw due to lower discharge pressure.

Borehole temp: 60.6F
Water temp in tank: 96.5F
Discharge line temp at entrance of tank:184.1F
Line temp at exit of tank: 101.7F
Discharge temp at compressor: 186F @ 260psi
Suction line temp at compressor: 64F @ 42psi
Amps:3.55

Borehole temp: 60.8F
Water temp in tank: 107.7F
Discharge line temp at entrance of tank:195F
Line temp at exit of tank: 112F
Discharge temp at compressor: 196.7F @ 300psi
Suction line temp at compressor: 65F @ 41psi
Amps:3.55

Borehole temp: 60.6F
Water temp in tank: 1116.5F
Discharge line temp at entrance of tank:200F
Line temp at exit of tank: 120F
Discharge temp at compressor: 203F @ 310psi
Suction line temp at compressor: 65F @ 40psi
Amps:3.63

My plan is to use the nice hot water I have and either find a larger cap tube or trim this one back some more.
The compressor never seems to be working to hard and casing never got over 205F.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

06-06-15, 10:35 PM	#11
MEMPHIS91 Journeyman EcoRenovator Join Date: Apr 2015 Location: Oxford, MS USA Posts: 496 Thanks: 69 Thanked 87 Times in 61 Posts	I think this data will show more about whats going on. Minutes - Temp F - Watts - Borehole Temp F 00 - 93 - 00 - 63.3 30 - 96.5 - .17 - 60.8 70 - 102 - .43 - 60.8 90 - 104.2 - .57 - 60.8 120 - 107.6 - .77 - 60.8 150 - 11.7 - .97 - 60.6 180 - 114.2 - 1.18 - 60.4 200 - 117.3 - 1.34 - 60.6 230 - 121.4 -1.66 - 60.8 As you can see my borehole temp hit about 60.8 and stayed there even in the hardest part of the cycle. My COP was around 2.08 - 2.37. Here is the charge info, what I found was that my cap tube size is stopping me from going past 42 psi suction pressure therefore limiting mass flow and forcing my discharge temp and pressure to increase. With more flow I can heat more water faster at a lower amp draw due to lower discharge pressure. Borehole temp: 60.6F Water temp in tank: 96.5F Discharge line temp at entrance of tank:184.1F Line temp at exit of tank: 101.7F Discharge temp at compressor: 186F @ 260psi Suction line temp at compressor: 64F @ 42psi Amps:3.55 Borehole temp: 60.8F Water temp in tank: 107.7F Discharge line temp at entrance of tank:195F Line temp at exit of tank: 112F Discharge temp at compressor: 196.7F @ 300psi Suction line temp at compressor: 65F @ 41psi Amps:3.55 Borehole temp: 60.6F Water temp in tank: 1116.5F Discharge line temp at entrance of tank:200F Line temp at exit of tank: 120F Discharge temp at compressor: 203F @ 310psi Suction line temp at compressor: 65F @ 40psi Amps:3.63 My plan is to use the nice hot water I have and either find a larger cap tube or trim this one back some more. The compressor never seems to be working to hard and casing never got over 205F.