Solar powered refrigeration/dehumidification

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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

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