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17-01-2007, 12:04 AM #1
new idea for heat pump clothes dryers
As many know, most heat pump (ventless) clothes dryers use R22, a HCFC that is about to be phased out. Once that happens, they will most likely have to switch to a HFC. However, it turns out that a HFC suitable for use in a clothes dryer is hard to find. R22 already has operating pressures in excess of 500PSI in a clothes dryer, so anything with a higher operating pressure will be impractical. That is, unless you use a new idea that can reduce operating temperatures without increasing drying time too much.
Why not pull a partial vacuum (25" Hg or so should be easy to achieve with a very simple vacuum pump) on the chamber before drying so water boils at a lower temperature? That corresponds to lower refrigerant pressures."If Hannah was an air handler, I would be a condensing unit so I could open her TXV and pump my refrigerant through her coils." - a HVAC friend of mine