HVAC legislation
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In most countries, any person who services an air conditioning system must be separately accredited to comply with local environmental protection legislation, or under close supervision of an accredited person.
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Vehicle heating & ventilation systems
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To improve passenger comfort and safety, fresh air is drawn from outside ducts and directed to the passenger compartment. Incoming air can be heated by passing over a small heating core connected to the engine’s cooling system.
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Basic air-conditioning principles
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Heat transfer can take place by one of three methods, conduction, convection and radiation.
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Air-conditioning capacity
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Latent heat is the amount of heat required to be added to a substance or removed from a substance to bring about a change of state.
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Air-conditioning refrigerant
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The refrigerant removes heat from the vehicle interior and transfers it to the outside air in a continuous cycle of vaporization and condensation.
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| Humidity |
Reducing the temperature of the air also reduces its humidity. Cold air will not hold as much water vapor as warm air. |
