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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]21^{\circ} F[/tex]
B. [tex]11^{\circ} F[/tex]
C. [tex]20^{\circ} F[/tex]
D. [tex]10^{\circ} F[/tex]

Answer :

To determine the total superheat entering the compressor, you need to follow these steps:

1. Identify the Given Values:
- The evaporating pressure for the refrigerant [tex]\( R-22 \)[/tex] is given as 76 psig.
- The compressor inlet temperature is given as [tex]\( 65^{\circ} F \)[/tex].

2. Find the Saturation Temperature:
- You need to find the saturation temperature of [tex]\( R-22 \)[/tex] at the given evaporating pressure of 76 psig.
- For this example, it's determined that the saturation temperature at 76 psig is [tex]\( 44^{\circ} F \)[/tex].

3. Calculate Total Superheat:
- Total superheat is calculated using the formula:
[tex]\[
\text{Total Superheat} = \text{Compressor Inlet Temperature} - \text{Saturation Temperature}
\][/tex]
- Substitute the values into the formula:
[tex]\[
\text{Total Superheat} = 65^{\circ} F - 44^{\circ} F = 21^{\circ} F
\][/tex]

So, the total superheat entering the compressor is [tex]\( 21^{\circ} F \)[/tex].

The correct answer is a. [tex]\( 21^{\circ} F \)[/tex].

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