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Answer :
To find the evaporator superheat, we need to take a couple of steps. Superheat is the difference between the actual temperature of the refrigerant vapor as it exits the evaporator and the saturation temperature of the refrigerant at the same pressure. Here's a step-by-step guide to solving this problem:
1. Identify Given Values:
- Evaporating pressure for R-22: 76 psig
- Evaporator outlet temperature: [tex]\(58^{\circ} F\)[/tex]
2. Refer to R-22 Refrigerant Pressure-Temperature Chart:
- We need to determine the saturation temperature ([tex]\(T_{\text{sat}}\)[/tex]) of R-22 at 76 psig. From the R-22 pressure-temperature chart, this is approximately [tex]\(45^{\circ} F\)[/tex].
3. Calculate the Evaporator Superheat:
- Superheat is calculated as the difference between the evaporator outlet temperature and the saturation temperature.
- Evaporator Superheat = Evaporator Outlet Temperature - Saturation Temperature
- Superheat = [tex]\(58^{\circ} F - 45^{\circ} F = 13^{\circ} F\)[/tex]
Thus, the evaporator superheat is [tex]\(13^{\circ} F\)[/tex]. Therefore, the correct answer is option A. [tex]\(13^{\circ} F\)[/tex].
1. Identify Given Values:
- Evaporating pressure for R-22: 76 psig
- Evaporator outlet temperature: [tex]\(58^{\circ} F\)[/tex]
2. Refer to R-22 Refrigerant Pressure-Temperature Chart:
- We need to determine the saturation temperature ([tex]\(T_{\text{sat}}\)[/tex]) of R-22 at 76 psig. From the R-22 pressure-temperature chart, this is approximately [tex]\(45^{\circ} F\)[/tex].
3. Calculate the Evaporator Superheat:
- Superheat is calculated as the difference between the evaporator outlet temperature and the saturation temperature.
- Evaporator Superheat = Evaporator Outlet Temperature - Saturation Temperature
- Superheat = [tex]\(58^{\circ} F - 45^{\circ} F = 13^{\circ} F\)[/tex]
Thus, the evaporator superheat is [tex]\(13^{\circ} F\)[/tex]. Therefore, the correct answer is option A. [tex]\(13^{\circ} F\)[/tex].
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