In the illustrated R-134a high pressure...

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Question 1 of 205eccef9dbacbc34ba4d4607b

In the illustrated R-134a high pressure centrifugal chiller refrigerant flow circuit, what is the functional purpose of the turbine? functions as a metering/expansion device maintaining a pressure differential between the high and low pressure sides of the system functions to deliver power to the compressor by aiding the electric drive motor See illustration GS-RA-26.

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🔍 Key Concepts

• Position of the turbine in the refrigerant flow path between condenser and cooler (evaporator) • How an expansion/metering device normally creates a pressure drop in a refrigeration cycle • Whether the turbine shaft is mechanically connected to the compressor/motor for power recovery

💭 Think About

• Trace the refrigerant path on the diagram: after leaving the condenser as high‑pressure liquid, through what component does it pass before entering the cooler (evaporator)? • Look closely at the shaft in the machine casing: does the turbine wheel share the same shaft as the compressor and motor, or is it separate? What does that imply about energy transfer? • Ask yourself: is the system’s high‑to‑low pressure difference mainly produced by the compressor, by the turbine, or by the throttling of liquid in an expansion device?

✅ Before You Answer

• Confirm the turbine’s inlet and outlet pressures by noting whether it is on the high‑pressure liquid line from the condenser to the low‑pressure side of the cooler. • Verify whether any other expansion/metering device (like a valve) is shown in that same line, or if the turbine alone performs the pressure‑reducing function. • Check if the turbine wheel is mechanically coupled to the compressor shaft, which would allow it to return some energy and assist the electric drive motor.

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