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Old 02-08-20, 06:46 AM   #1
gadget
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Join Date: Dec 2019
Location: Northern Utah
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Default DIY multi stage Heat Pump from multiple compressors

I like the idea of the variable output heat pumps but since my budget is in the DIY range, I'm thinking a home made 2 or 3 stage. Also, I like the idea of being able to use different power sources for each stage. Example would be a solar setup that is not tied to the grid/house. It could be used for some of the stages.

- first stage may be just an small fractional HP compressor comes on at say 98F
- Second stage another fractional HP compressor at say 95F
- Then a 1 HP compressor at 93F

They would all use the same water source that could also come on in higher flow rates as the stages ramp up. They would all be heating the same buffer tank.

So basically a multi stage DIY HP that is accomplished by using multiple recycled compressors with separate refrigerant systems but common heat exchangers sharing the same source water and heating tank.

Any thoughts or challenges? I may want to have the ability to change my buffer tank temp to change radiant heating rates but maybe I can just cycle the radiant flow on and off?

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