G2 Gas Fitter Practice Exam

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What is the expected function of a heat exchanger in HVAC systems?

To release outdoor air
To maintain humidity levels
To transfer heat between fluids
To filter particles from air

The correct answer is: To transfer heat between fluids

The expected function of a heat exchanger in HVAC systems is to transfer heat between fluids. Heat exchangers play a crucial role in improving energy efficiency by allowing heat to be exchanged between two or more fluids without mixing them. This process helps in either heating or cooling the air inside a building by transferring the heat from one fluid to another, such as from refrigerant or boiler water to the air circulating within the system. The transfer of heat can occur in various configurations, including coil-based systems or plate designs, and is essential for maintaining a comfortable indoor environment while reducing energy consumption. The other functions mentioned, like releasing outdoor air, maintaining humidity levels, or filtering particles, represent different aspects of HVAC technology that can involve other components but are not the primary purpose of a heat exchanger. For instance, outdoor air is typically managed by an air handling unit, humidity control often involves dehumidifiers or humidifiers, and particle filtration is mainly the job of air filters. Each of these systems serve distinct purposes within the broader HVAC structure, but none encapsulate the heat transfer role of a heat exchanger.