Heat gain
Heat gain refers to the increase in temperature within a conditioned space due to various sources. These can include heat from sunlight entering through windows (solar radiation), warm air infiltrating through gaps or leaks, heat generated by people as they breathe and move around (occupant respiration), and heat emitted by lighting, appliances, or other devices inside the space. This concept is important in HVAC as it helps determine the cooling capacity needed to maintain a comfortable indoor temperature.
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