In a simple saturated cycle, an R-134a...

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Question 1 of 205eccef9dbacbc34ba4d45f66

In a simple saturated cycle, an R-134a refrigeration system has a high side pressure of 96.626 psig and a low side pressure of 9.0751 psig. Using this information and the data shown in the illustration, determine the refrigeration effect per pound of refrigerant circulated, neglecting any subcooling or superheating effects? See illustration GS-RA-23.

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🔍 Key Concepts

• Use the saturation table GS-RA-23x to match the given pressures (after converting psig to psia) to the correct temperatures and enthalpies. • For a simple saturated refrigeration cycle with no subcooling or superheating, the refrigeration effect per pound is the enthalpy difference across the evaporator: saturated vapor leaving the evaporator minus saturated liquid entering the expansion device. • In a throttling (expansion) valve, the process is essentially isenthalpic, so the enthalpy just before and just after the valve are the same.

💭 Think About

• After converting the given high and low side pressures from psig to psia, which rows in the table correspond to those pressures, and what are the saturated liquid enthalpy at the high side and vapor enthalpy at the low side? • For a simple saturated cycle with no subcooling or superheating, which state points in the cycle lie exactly on the saturated liquid line and which lie on the saturated vapor line? How does that simplify which enthalpy values you use? • Once you have the correct two enthalpy values from the table, what single subtraction gives you the refrigeration effect per pound of refrigerant, and which of the answer choices is closest to that result?

✅ Before You Answer

• Be sure you convert psig to psia by adding atmospheric pressure (~14.7 psi) before using the saturation table. • Confirm that you are using Enthalpy (L) for the condenser outlet / expansion valve inlet and Enthalpy (V) for the evaporator outlet / compressor inlet. • Double-check that you are not accidentally using superheated or subcooled values—the problem states a simple saturated cycle with no subcooling or superheating.

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