Author Topic: Thin Plate Evaporator Versus Holding Plate Evaporator  (Read 461 times)

Richard

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Thin Plate Evaporator Versus Holding Plate Evaporator
« on: April 06, 2018, 03:29:05 pm »
It is true that many boaters assume that holding plates are more efficient than thin evaporator plates. Compressor manufacturers calculate the different  Coefficient Of Performance of each compressor example, Danfoss reports the BD50 compressor has its best ASHRAE  COP rating of  1.38 watt at -4 degree F temperature output.  A COP of less than 1.0 indicates watts of Btu energy coming out of compressor is less than watts of incoming power to drive compressor this then is less than desirable performance. The higher this ratio the more efficient the compressor will be.

The efficiency of condenser and evaporator also need to be efficient if total System Coefficient Of Performance is to be as good as compressor COP.  If the condenser design is poor or incorrectly installed in boat the compressor COP is reduced do to higher refrigerant pressures.

To answer the question how the standard evaporator can be more efficient than a holding plate. If icebox conversion holding plate evaporators are cut open you will see why many of the plates will have a negative less than one COP. Thin plate evaporators when selected to match the Btu capacity of compressor and design application capacity can be very efficient. The efficiency of any type evaporator will also depend on the pre adjusted refrigerant flow.