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Plate Heat Exchangers In Refrigerant Application

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#1 dudadiesel


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Posted 04 February 2010 - 01:41 AM

I am going to attempt to build an air conditioner using plate heat exchangers as the condenser/evaporator. I am having trouble deciding what pressures (or condensing/evaporating temps) to set my system at. My goal is to cool a light glycol/water mix down to 30 degrees F or so before the compressor halts, and circulate the mixture around a building, cooling it or just condensing moisture out of the air, depending what we're doing for the day. The condenser will be pure water passing through a heat exchanger, taking the heat outside and dumped into drums. In the future, hopefully a well where I can draw cold water back up from the bottom.

The compressor data shows highest BTU/hour (efficiency) at a high evaporating temp and low condensing temp. Makes sense as this means not so high pressure and not so low pressure, just a lot of flowing freon. However, this will make it inefficient when the water/glycol begins to approach the 45 degrees or lower now, wouldn't it? So since the goal is to cool it down to these low temps, should I not be setting the evaporation temps lower to get that phase change in the process?

The heat exchangers I am using are at dudadiesel.com

I'll be using much longer/wider heat exchangers than what is posted there, but it gives the idea incase anyone needs to take a look.

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