12kbtu heat pump
Ok so I'm starting a thread to be more specific to my first refrigeration system hack.
I have 2 12kbtu compressors. 1 is an r22 unit and the other is r134a. I plan to use the r22 unit and swap it over to r290. I would like some help sizing the brazed plate heat exchangers(or coax) so I can start keeping an eye out for good deals.
Also I work with a guy who is an electronics engineer and loves playing with arduinos and raspberry pi's so I lm going to ask for his help with the controls. I have some very fancy flow control valves that are good for 2000psi and really high and low temps. I want to make an electronic expansion valve with one of these flow meters and a stepper motor.
My next question is what parts of the system do I want to monitor to control the exv? Pressures on high and low? Temps in and out of hi and low sides? Amp draw of compressor?
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