Difference between revisions of "Solar powered refrigeration/dehumidification"

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[[File:turnipgreens.jpg|200px|turnip based refrigeration]]
 
[[File:turnipgreens.jpg|200px|turnip based refrigeration]]
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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
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[[File:CaCl_phase_diag.jpg|200px|CaCl phase diagram]] it seems that at 80wt% CaCl there is no liquid and thus nothing to evaporate.
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[https://docs.google.com/open?id=0B__TC33Q8YSRSkJ1VXNIS2Etd0k absorption refrigeration]
 
[https://docs.google.com/open?id=0B__TC33Q8YSRSkJ1VXNIS2Etd0k absorption refrigeration]

Revision as of 10:13, 23 July 2012

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 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

turnip based refrigeration

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 CaCl phase diagram it seems that at 80wt% CaCl there is no liquid and thus nothing to evaporate.


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