NCEES HVAC # 530

[Ronin]

The problem gives a super heat of 20degrees at the compressor.

The load on the evaporator does not take this into consideration.

Any one know why? Isn't the effect of superheat added to the net refrigeration effect?

 

[HerrKaLeun]

good question. In my opinion they should use 107.94 Btu at 40°F vapor. Maybe it is a mistake?

It doesn't affect the end result much, though. One would chose "B" one way or another.

Unless they somehow use compressor heat to super-heat, I would consider super-heating as part of the evaporator. The same way sub-cooling is part of the condenser (even when that doesn't condense anymore).

 

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[Ronin]

good question. In my opinion they should use 107.94 Btu at 40°F vapor. Maybe it is a mistake? It doesn't affect the end result much, though. One would chose "B" one way or another.

Unless they somehow use compressor heat to super-heat, I would consider super-heating as part of the evaporator. The same way sub-cooling is part of the condenser (even when that doesn't condense anymore).

Thanks, HerrKaLeun