We had a conversation with a very talented mechanical engineer who is a manager for a multinational car airconditioning manufacturer - he is in charge of logistics. I discussed with him the idea of solar aircon. And from he is coming from, he discussed the idea of heat exchanger. The heat of the airconditioning is needed to vaporize the refrigerant, and the cold temperature of the system is needed to condense the refrigerant - so why not conserve this using the heat exhanger.
The idea is a heat exchanger which is very simple device - a double tube with outer tube that is only 40 mm long. It is not proprietary and there could be suppliers
For car airconditioners heat exchanger
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