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Air Conditioning Systems Questions and Answers

1.

Which type of air conditioning system is commonly used for large buildings or entire city blocks and utilizes a central plant for cooling?

Exam Year(s)

DSSSB - 2023,

Answer: B

A district cooling system is used for large buildings or entire city blocks, with a central plant for cooling. Chilled water from the central plant is piped to the buildings. Portable units, window units and split systems are for single rooms or small spaces and have their own compressors, so they do not use a central plant.

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2.

In a variable refrigerant flow (VRE) system, what allows the system to simultaneously provide heating and cooling to different zones in a building?

Exam Year(s)

DSSSB - 2023,

Answer: A

Heat recovery technology allows a variable refrigerant flow system to give heating and cooling to different zones at the same time. In a heat recovery VRF system the heat removed from the zones that need cooling is moved to the zones that need heating, and this is done through refrigerant circuits, with three pipes in many models. Split type compressors, variable speed fans and dual thermostat control do not give the simultaneous heating and cooling by themselves.

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