Answer :
To solve this problem, follow these steps:
1. Understand the Terminology:
- Evaporator Outlet Temperature: This is the temperature of the refrigerant as it leaves the evaporator coil. In this problem, it is given as [tex]\(50^{\circ} F\)[/tex].
- Evaporator Superheat: This is the temperature increase of the refrigerant above its saturation temperature as it exits the evaporator. Here, it is [tex]\(10^{\circ} F\)[/tex].
2. Determine the Saturation Temperature:
- The saturation temperature is the temperature at which the refrigerant boils in the evaporator. You can determine this by subtracting the superheat from the evaporator outlet temperature:
[tex]\[
\text{Saturation Temperature} = \text{Evaporator Outlet Temperature} - \text{Superheat}
\][/tex]
- Using the values provided:
[tex]\[
\text{Saturation Temperature} = 50^{\circ} F - 10^{\circ} F = 40^{\circ} F
\][/tex]
3. Find the Evaporating Pressure:
- The saturation temperature corresponds directly to a specific pressure in the refrigerant cycle for a given refrigerant. In an R-410A system, the pressure that corresponds to a saturation temperature of [tex]\(40^{\circ} F\)[/tex] is known to be [tex]\(118 \text{ psig}\)[/tex].
Therefore, the evaporating pressure of the refrigerant in this system is 118 psig.
Answer: b. 118 psig
1. Understand the Terminology:
- Evaporator Outlet Temperature: This is the temperature of the refrigerant as it leaves the evaporator coil. In this problem, it is given as [tex]\(50^{\circ} F\)[/tex].
- Evaporator Superheat: This is the temperature increase of the refrigerant above its saturation temperature as it exits the evaporator. Here, it is [tex]\(10^{\circ} F\)[/tex].
2. Determine the Saturation Temperature:
- The saturation temperature is the temperature at which the refrigerant boils in the evaporator. You can determine this by subtracting the superheat from the evaporator outlet temperature:
[tex]\[
\text{Saturation Temperature} = \text{Evaporator Outlet Temperature} - \text{Superheat}
\][/tex]
- Using the values provided:
[tex]\[
\text{Saturation Temperature} = 50^{\circ} F - 10^{\circ} F = 40^{\circ} F
\][/tex]
3. Find the Evaporating Pressure:
- The saturation temperature corresponds directly to a specific pressure in the refrigerant cycle for a given refrigerant. In an R-410A system, the pressure that corresponds to a saturation temperature of [tex]\(40^{\circ} F\)[/tex] is known to be [tex]\(118 \text{ psig}\)[/tex].
Therefore, the evaporating pressure of the refrigerant in this system is 118 psig.
Answer: b. 118 psig
