Temperature and humidity sensor for HVAC ventilation ducts to detector temperature & humidity

HVAC is the English abbreviation of Ventilation and Air Conditioning which is heating ventilating and air conditioning. It not only represents the above academic and technical contents but also represents the related trades and industries involved in the above subject and technology. HVAC also means an application subject that has a wide influence on the world architecture design, project and manufacturing industry. There are HVAC Association, HVAC branch of architectural society of China(the official representative body of China) in each country. The heat transfer theory, engineering thermodynamics and hydromechanics are their basic theories. Their research and development direction is proving a more comfortable working and learning environment for people.

The theory of air condition to supply cooling, heating, or dehumidification is similar. The use of refrigerant under the action of the compressor, evaporation or condensation, thereby causing the evaporation or condensation of the surrounding air, to achieve the purpose of changing the temperature and humidity. It's worth  noting that the “warming machine” is rare and the thermal efficiency is greater than 1 excellent equipment (If the “ greenhouse effect” is not be considered. This makes it less useful in sub-tropical areas than it is in temperate ones.

HVAC is a air condition with heating, ventilate and air conditioning.
HAVC is the comprehensive abbreviation of its three main function -Heating,Ventilating and Air Conditioning.

HVAC is the air regulation system or related equipment in charge  of  heating and ventilating indoor and in the car. The design of the HVAC system relates to the thermodynamics, hydromechanics and fluid machinery, which is an important branch subject of the Mechanical engineering field. Sometimes, “R” is added into the HVAC that stands for Refrigeration.  So that the abbreviation is turning into “HVAC&R” or “HVACR”.Or adding into the “R” and delete the “V” which stands for the ventilate, the abbreviation becomes the “HACR”. The HVAC system can control the air temperature and humidity, improving indoor comfort. It is an important process of the medium and large industrial buildings or office buildings(such as the skyscraper ).

In modern architecture, the above function (including its controlling system and the design & install of the system) will be integrated into one and many HVAC systems. For a small building, the contractor will choose the HVAC system and equipment as their requirement directly. For the large one, the choice of the HVAC system will be analyzed and design by architectural designers and engineers of machine and structure, and installed by a professional machinery contractor.

The HVAC system is an international industry that including the system operating, maintaining, design & structure, equipment manufacturer & business, learning & education promotion. The HVAC industry was managed by the HVAC equipment manufacturer before. There much international management and standard organizations concern about this area. Including the HARDI, the ASHRAE, the SMACNA, the Air Conditioning Contractors of America, the Uniform Mechanical Code and the International Building Code are be used to provide HVAC related services and improve its level.