What is the primary function of a heat wheel in HVAC systems?

The primary function of a heat wheel in HVAC systems is to transfer heat between air streams. A heat wheel, also known as a rotary heat exchanger, is designed to enhance the energy efficiency of HVAC systems by allowing for the exchange of thermal energy between incoming fresh air and outgoing exhaust air. As the wheel rotates, one side absorbs heat from the warmer exhaust air, while the opposite side transfers that absorbed heat to the cooler incoming air. This process minimizes energy loss and can significantly reduce the heating and cooling loads on the system.

Understanding this function is crucial for HVAC professionals, as it highlights the importance of energy recovery ventilation in optimizing system performance and maintaining indoor air quality.