A liquid to suction heat exchanger is often used to...

A liquid to suction heat exchanger is often used to...

• A. Decrease discharge temperature
• B. Decrease suction pressure
• C. Increase evaporator superheat
• D. Increase liquid sub-cooling

Answer: (D)

A liquid-to-suction heat exchanger cools the high‑pressure liquid by taking heat from the suction gas returning to the compressor, which subcools the liquid before it reaches the expansion device. Subcooling means the liquid stays liquid longer and doesn’t flash into vapor at the metering point, so more refrigerant can absorb latent heat in the evaporator, improving efficiency and capacity. This device isn’t used to lower the discharge temperature, reduce suction pressure, or increase evaporator superheat; its main purpose is to increase liquid sub-cooling.

A liquid-to-suction heat exchanger cools the high‑pressure liquid by taking heat from the suction gas returning to the compressor, which subcools the liquid before it reaches the expansion device. Subcooling means the liquid stays liquid longer and doesn’t flash into vapor at the metering point, so more refrigerant can absorb latent heat in the evaporator, improving efficiency and capacity. This device isn’t used to lower the discharge temperature, reduce suction pressure, or increase evaporator superheat; its main purpose is to increase liquid sub-cooling.