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Answer :
To determine the pressure of a storage cylinder filled with R-134a (a common refrigerant) at a temperature of 100°F, we need to understand the relationship between temperature and pressure for R-134a.
R-134a, like many refrigerants, follows specific pressure-temperature characteristics. These characteristics are often provided in tables that relate the temperature of the refrigerant to its saturation pressure.
Here is a step-by-step guide on how you might approach this without using tables:
1. Identify the Temperature: We know the temperature in the room is 100°F.
2. Relate Temperature to Pressure: At 100°F, the corresponding saturation pressure for R-134a is needed.
3. Find the Corresponding Pressure: From the standard pressure-temperature tables or charts for R-134a, it is known that at 100°F, the saturation pressure is approximately 124 psig (pounds per square inch gauge).
4. Select the Correct Answer: With this pressure in mind, the correct choice from the given options is:
- A. 37 psig
- B. 84 psig
- C. 124 psig
- D. 207 psig
The correct answer is C. 124 psig. This is the pressure that corresponds to 100°F for R-134a.
R-134a, like many refrigerants, follows specific pressure-temperature characteristics. These characteristics are often provided in tables that relate the temperature of the refrigerant to its saturation pressure.
Here is a step-by-step guide on how you might approach this without using tables:
1. Identify the Temperature: We know the temperature in the room is 100°F.
2. Relate Temperature to Pressure: At 100°F, the corresponding saturation pressure for R-134a is needed.
3. Find the Corresponding Pressure: From the standard pressure-temperature tables or charts for R-134a, it is known that at 100°F, the saturation pressure is approximately 124 psig (pounds per square inch gauge).
4. Select the Correct Answer: With this pressure in mind, the correct choice from the given options is:
- A. 37 psig
- B. 84 psig
- C. 124 psig
- D. 207 psig
The correct answer is C. 124 psig. This is the pressure that corresponds to 100°F for R-134a.
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