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HVAC (pronounced either "H-V-A-C" or "aitch-vak") is an acronym that stands for the closely related functions of "Heating, Ventilating, and Air Conditioning"- the technology of indoor environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). HVAC is particularly important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with temperature and humidity, as well as "fresh air" from outdoors. From Wikipedia under the
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Q. My HVAC unit seems to be failing. It starts up, make a very high pitched sound. The fan does not appear to be hitting anything. The air handler is not blowing any air, as I suspect it's waiting for the outside unit to produce heat so it does not cold air. any thoughts? The unit is about 3 years old. Thanks! Asked by Old School - Tue Mar 11 10:16:00 2008 - - 3 Answers - 0 Comments A. call company that installed the unit for you if it is only 3 years old maybe under warranty still.. Answered by monica - Tue Mar 11 11:03:30 2008 From Yahoo Answer Search: "HVAC"
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Refrigeration Service Engineers Society
Numerical Modeling of Cryocoolers
High Performance HVAC