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marx290 · 09-09-15, 03:18 PM

I have a feeling that this small DC compressor stuff should spawn a thread of its own. A friend of mine just ordered one of the small Chinese made compressors from eBay. He lacks brazing experience and tools, while I lack in electronics and controls. I was going to build small 24 VDC air conditioning unit or a refrigerator. Either way, I want to construct it in such a way, that he can design a controller for it, utilizing a few line temps and pressures, to then modulate the compressor speed along with fan speeds.

As much as I'd like to mess with electronic expansion valves, I think I'll try my hand at a capillary tube setup, or a hand operated expansion valve. Varying the speeds on the fans and the compressor will control superheat and cooling capacity.

He says he can easily control the speed of some large computer fans. Refrigerant will likely be propane. Any ideas?

09-09-15, 03:18 PM	#190
marx290 Vapor Compression Goon Join Date: Mar 2013 Location: Portland, OR Posts: 63 Thanks: 11 Thanked 22 Times in 11 Posts	I have a feeling that this small DC compressor stuff should spawn a thread of its own. A friend of mine just ordered one of the small Chinese made compressors from eBay. He lacks brazing experience and tools, while I lack in electronics and controls. I was going to build small 24 VDC air conditioning unit or a refrigerator. Either way, I want to construct it in such a way, that he can design a controller for it, utilizing a few line temps and pressures, to then modulate the compressor speed along with fan speeds. As much as I'd like to mess with electronic expansion valves, I think I'll try my hand at a capillary tube setup, or a hand operated expansion valve. Varying the speeds on the fans and the compressor will control superheat and cooling capacity. He says he can easily control the speed of some large computer fans. Refrigerant will likely be propane. Any ideas? __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.