Hello everyone. I'm building a small, custom made a/c unit to cool an electronics cabinet. The electronics container sits remotely, far from people and sensitive electronics are inside. Long story short, I'm making a a/c that will cool about 300 watts of power to about 75F. The box is EXTREMELY insulated, we can assume no air goes in or out.
I'm Using a condensing unit like the one in this posting :
The Evap is about 80mm square, and has about 8 passes. Dont know how else to describe it. 100% copper.
I'm using R134.
After full assembly, I pulled a full vacuum for 1 hr, then waited and it held for 1 hr, then charge with gas. i ran some test. this is where the problem is. Its not cold enough. The Condenser does not feel hot, the evaporator blows "cool" air, but not cold, like a window a/c would.
I'm not really sure how much Refrigerant I put in it. These are the stats I got:
At Compressor MAX and Evap fan in medium air flow.
Condenser pressure= 1Mpa (145 psi), 43C~(109F)
Condenser outgoing liquid ( taken at end of dryer filter, where capillary begins) 100F
Evaporator pressure= 0.35Mpa (50.7 psi), 12C~(53f)
Evaporator outgoing gas ( about 1 inch of pipe out of evap) 64.6F
Ambient air=82F
Incoming air to Evap =82
Air coming out of Evap= 73~74.5F
I believe my capillary is too short. Anyone got any ideas to increase superheat and supercool?
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