Please come to the point of energy exchange using vacume.The partial or negative pressure in a tank due to collapse in volume to air when cooled in sealed condition.absolute vacume is 30kg-m work . 273litre air 1deg c heating expands to 274litre, and going on proportional to rise in temperature.The space created by cooling is able to admit atmospheric air at 1kg pressure or near to it.Suppose this system for lifting water from a depth of 3-4m.Converting solar heat in to work.work done by 1 dg c rise in temperature to 1kg of airis 29kg-m . By cooling this air work is proposed to be extracted.Average solar insolation of 1000mw heat per sq km has to be converted for overcoming present situation.high temperature solar heaters in practice can be used .200 dg C to 1000 dg C are available.Try to win the goal.
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