When two refrigerated spaces in a...

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Question 1 of 205eccef9dbacbc34ba4d4600c

When two refrigerated spaces in a refrigeration system are served by a single compressor and condenser, yet are maintained at different temperatures, what is true concerning an installed back pressure regulating valve?

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🔍 Key Concepts

• How evaporator pressure relates to temperature inside a refrigerated box • The purpose of a back pressure regulating valve in multi-box systems • Which box (warmer or colder) needs its evaporator pressure held up or limited so both can run from one compressor

💭 Think About

• Think about which space (warmer or colder) needs a higher boiling temperature of the refrigerant in its evaporator to maintain its set box temperature. • If you raise the evaporator pressure, what happens to the refrigerant’s boiling temperature, and does that suit the warmer or the colder box? • In a system with one compressor and two boxes at different temperatures, does the back pressure valve protect the low-temperature side or prevent the higher-temperature side from going too low in pressure?

✅ Before You Answer

• Identify clearly: higher evaporator pressure = higher evaporating temperature, and lower pressure = lower evaporating temperature. • Decide which box (warmer or colder) must have the higher evaporating temperature to maintain its space temperature. • Confirm your option matches a valve that is installed in the suction line of the appropriate box to control its evaporator pressure.

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