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If the evaporating pressure was 76 psig for [tex]R-22[/tex] and the compressor inlet temperature was [tex]65^{\circ} F[/tex], what would be the total superheat entering the compressor?

A. [tex]10^{\circ} F[/tex]

B. [tex]20^{\circ} F[/tex]

C. [tex]21^{\circ} F[/tex]

D. [tex]11^{\circ} F[/tex]

Answer :

To determine the total superheat entering the compressor, we need to follow a few steps using the given problem statement:

1. Understand the Terminology:
- Evaporating Pressure: This is the pressure at which the refrigerant is evaporating or boiling.
- Compressor Inlet Temperature: This is the temperature of the refrigerant as it enters the compressor.
- Superheat: This is the amount of heat added to the refrigerant vapor above its saturation temperature at a given pressure.

2. Given Information:
- Evaporating pressure: 76 psig for refrigerant R-22.
- Compressor inlet temperature: [tex]\(65^\circ F\)[/tex].

3. Find the Saturation Temperature:
- For different refrigerants, at a specific pressure, there is a corresponding saturation temperature at which the refrigerant changes from liquid to vapor. This saturation temperature depends on the pressure level.
- At an evaporating pressure of 76 psig for R-22, the saturation temperature is assumed or given to be [tex]\(54^\circ F\)[/tex].

4. Calculate the Total Superheat:
- Total superheat is the difference between the actual temperature of the refrigerant entering the compressor and its saturation temperature at the given pressure.
- Total superheat = Compressor inlet temperature - Saturation temperature.
- Substitute the known values:
[tex]\[
\text{Total Superheat} = 65^\circ F - 54^\circ F = 11^\circ F
\][/tex]

Thus, the total superheat entering the compressor is [tex]\(11^\circ F\)[/tex].

So, the correct answer is option d. [tex]\(11^\circ F\)[/tex].

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