Heater & Crunch
Heating, ventilation, and air conditioning (HVAC ) systems regulate temperature, humidity, and indoor air quality in residential, commercial, and industrial buildings, and in enclosed vehicles. They are designed to provide thermal comfort and to control airborne contaminants through heating, cooling, ventilation, filtration, and humidity control. HVAC system design is a subdiscipline of mechanical engineering based on the principles of thermodynamics, fluid mechanics, and heat transfer. Design considerations include energy efficiency, indoor air quality, maintenance, and environmental impact, particularly in green building projects. In building design, mechanical, electrical, and plumbing engineers may integrate HVAC systems with other building systems and use energy modeling to evaluate performance and operating costs. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, while ventilation is sometimes omitted, as in HACR.
Ventilation (the "V" in HVAC) is the process of exchanging or replacing air in any space to provide higher air quality. This involves temperature regulation, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, and keeps interior air circulating. Building ventilation methods are generally classified as mechanical (forced) ventilation or natural ventilation.
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