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Answer :
To calculate the evaporator superheat for R-22, follow these steps:
1. Understand the Terms:
- Evaporating Pressure: This is the pressure of the refrigerant in the evaporator. It's given as 76 psig.
- Evaporator Outlet Temperature: This is the temperature of the refrigerant as it exits the evaporator. It's given as [tex]\(58^{\circ} F\)[/tex].
- Saturation Temperature: This is the temperature at which the refrigerant would begin to evaporate at the given pressure. This needs to be looked up in a pressure-temperature chart for R-22 at 76 psig.
2. Look Up Saturation Temperature:
- At 76 psig for R-22, the saturation temperature is typically around [tex]\(45^{\circ} F\)[/tex]. This value is generally obtained from a refrigerant pressure-temperature chart.
3. Calculate Superheat:
- Superheat is the difference between the evaporator outlet temperature and the saturation temperature. It indicates how much additional heat the refrigerant has absorbed beyond its boiling point.
- Use the formula:
[tex]\[
\text{Superheat} = \text{Evaporator Outlet Temperature} - \text{Saturation Temperature}
\][/tex]
Substituting the given values:
[tex]\[
\text{Superheat} = 58^{\circ} F - 45^{\circ} F = 13^{\circ} F
\][/tex]
So, the evaporator superheat is [tex]\(13^{\circ} F\)[/tex]. This matches choice A in the given options.
1. Understand the Terms:
- Evaporating Pressure: This is the pressure of the refrigerant in the evaporator. It's given as 76 psig.
- Evaporator Outlet Temperature: This is the temperature of the refrigerant as it exits the evaporator. It's given as [tex]\(58^{\circ} F\)[/tex].
- Saturation Temperature: This is the temperature at which the refrigerant would begin to evaporate at the given pressure. This needs to be looked up in a pressure-temperature chart for R-22 at 76 psig.
2. Look Up Saturation Temperature:
- At 76 psig for R-22, the saturation temperature is typically around [tex]\(45^{\circ} F\)[/tex]. This value is generally obtained from a refrigerant pressure-temperature chart.
3. Calculate Superheat:
- Superheat is the difference between the evaporator outlet temperature and the saturation temperature. It indicates how much additional heat the refrigerant has absorbed beyond its boiling point.
- Use the formula:
[tex]\[
\text{Superheat} = \text{Evaporator Outlet Temperature} - \text{Saturation Temperature}
\][/tex]
Substituting the given values:
[tex]\[
\text{Superheat} = 58^{\circ} F - 45^{\circ} F = 13^{\circ} F
\][/tex]
So, the evaporator superheat is [tex]\(13^{\circ} F\)[/tex]. This matches choice A in the given options.
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