maybe I can help in another day about your requirement to find the formula on evap condesers work, you need to think about this is a heat exchanger only but is "evaprative" this means the effect of energy rejection is done at evaporative temperature and this temperature of course is affected by...
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there is another option for material on this, as far you are in low temperatures you can use duplex stainless s31803 tubing and ss T316 tubesheet, the plate and frame heat exchangers are the most efficient in size and are but they are not the most practical for sea...
