superheat calculation
superheat calculation
(OP)
i am using a software to simulate a refrigeration cycle and i need to feed the superheat value in the compressor data. how do i calculate the superheat from the compressor catalogue data( return gas temp. is mentioned in compressor catalogue). Is this value different from evaporator superheat?





RE: superheat calculation
A/C with a “fixed orifice” is charged to the superheat of the suction line leaving the evaporator. Superheat is the gas temperature above the saturated temperature.
Superheat can be split into two types of heat:
(1) Superheat of the evaporators and
(2) Total superheat entering the compressor.
The evaporators superheat must be figured at the evaporator outlet not at the compressor inlet. Total superheat is figured at the compressor inlet.
RE: superheat calculation
You probably have a DX (direct expansion) system as [/u]imok2[/u] has answered since your catalog mentions constant return gas temperature which most industrial compressors won't mention. There are some supermarket refrigeration systems which have long suction lines which can pick up considerable superheat and are sometimes modeled as constant return gas. If by chance you have a liquid recirculation system the total superheat is usually very low if any. If you have a flooded system you won't have any useful superheat but you may have a couple of degrees in the suction line mostly due to pressure drop of one to two pounds.
The superheat is important for the refrigeration cycle calculations for two reasons:
1) The useful superheat contributes to the refrigeration effect of the system.
2) All superheat reduces the mass flow capacity (and therefore the refrigeration capacity) of the compressor since it decreases the density of the gas which reduces the mass of gas which can be brought into the constant volume suction of the compressor.
RE: superheat calculation
Take the "V" out of HVAC and you are left with a HAC(k) job.