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6. The evaporating pressure for [tex]R-22[/tex] is 76 psig, and the evaporator outlet temperature is [tex]58^{\circ} F[/tex]. What is the evaporator superheat?

A. [tex]13^{\circ} F[/tex]
B. [tex]45^{\circ} F[/tex]
C. [tex]58^{\circ} F[/tex]
D. [tex]132^{\circ} F[/tex]

Answer :

Sure! Let's solve this step by step.

1. Identify the given values:
- The evaporating pressure for R-22 is 76 psig.
- The evaporator outlet temperature is 58°F.

2. Understand what we need to find:
- We need to find the evaporator superheat.

3. Define superheat:
- Superheat is the difference between the actual temperature at the evaporator outlet and the saturation temperature at the given pressure.

4. Determine the saturation temperature:
- For R-22 refrigerant, the saturation temperature corresponding to 76 psig is approximately 45°F. (This is a standard value known from pressure-temperature correlation tables used in HVAC/R).

5. Calculate the superheat:
- Superheat = Evaporator outlet temperature - Saturation temperature
- Superheat = 58°F - 45°F

6. Compute the result:
- Superheat = 13°F

So, the evaporator superheat is [tex]\( \boxed{13^\circ \text{F}} \)[/tex].

The correct answer is:
a. [tex]\( 13^\circ \text{F} \)[/tex]

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