Solar powered refrigeration/dehumidification
We have a 1m x 2m x 0.5mm sst sheet with mirror finish for a parabolic trough absorber. Would like to do either icemaker or dehumidifier . One nagging question - is it not possible to avoid ammonia/libr by use of water and low pressure (e.g. 0.01atm)
Dror Zchori has been doing some expts hooking up his absorption refrigerator (normally gas powered) to a solar collector - he reached over 200C in oil in a vacuum tube collector at the focus of a ~20cm width ~180cm length parabolic trough but so far it doesnt seem to run the refrigerator
One thing to think about is that if we are using water at a gas pressure of 0.01atm, then what keeps the water in the salt from boiling? We need the salt to 'grab' the water enough that the vapor pressure of water at lets say 20C at night is less than 0.01atm. From the phase diagram it seems that at 80wt% CaCl there is no liquid and thus nothing to evaporate.