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randen · 09-07-12, 06:14 PM

I had thought about building a double compressor GSHP but the complexity seamed to make it a lofty dream. I had two compressors in captivity but again the further I had looked into it it got difficult. If I was to build another GSHP I would use a 3 phase compressor and moderate the speed with a VFD. This would provide a nice soft start and you could slow it for a reduced out-put. Even still a plain single phase GSHP is pretty efficient. It starts with no load and I'm not really convinced if slowing the compressor and reducing the heat out-put when a temperature set point is reached would save a noticable amount of energy.

Randen

09-07-12, 06:14 PM	#18
randen Uber EcoRenovator Join Date: Apr 2011 Location: Strathroy Ontario Canada Posts: 657 Thanks: 9 Thanked 191 Times in 129 Posts	I had thought about building a double compressor GSHP but the complexity seamed to make it a lofty dream. I had two compressors in captivity but again the further I had looked into it it got difficult. If I was to build another GSHP I would use a 3 phase compressor and moderate the speed with a VFD. This would provide a nice soft start and you could slow it for a reduced out-put. Even still a plain single phase GSHP is pretty efficient. It starts with no load and I'm not really convinced if slowing the compressor and reducing the heat out-put when a temperature set point is reached would save a noticable amount of energy. Randen