Post by marc on Sept 30, 2015 10:48:06 GMT -7
I've designed and built large and small solar powered absorption cooling systems. It sounds really cool in theory, but in practice………
There is difficulty in achieving a high enough temperature to be efficient. I went so far as to try oil based, evacuated tube in both flat plate glazed, and parabolic tracking systems. Moving away from ammonia to a much lower temperature based lithium salt compound helped – but you need to provide the system a steady supply high temperature media. A continuous flow of 205F+ is not easy to get……
Next, remember that your condensing side has to reject all of the input heat PLUS the heat removed from the conditioned space. This heat rejection typically needs sizable electric fan motors………
I much prefer the current generation of DC powered compressors running on a PV based system - even without batteries.
Marc
There is difficulty in achieving a high enough temperature to be efficient. I went so far as to try oil based, evacuated tube in both flat plate glazed, and parabolic tracking systems. Moving away from ammonia to a much lower temperature based lithium salt compound helped – but you need to provide the system a steady supply high temperature media. A continuous flow of 205F+ is not easy to get……
Next, remember that your condensing side has to reject all of the input heat PLUS the heat removed from the conditioned space. This heat rejection typically needs sizable electric fan motors………
I much prefer the current generation of DC powered compressors running on a PV based system - even without batteries.
Marc
