INTRODUCTION TO HAVC

Heating, ventilation, and air conditioning is the technology of indoor and Parking environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality( IAQ ). H.V.A.C system design is a sub-discipline of mechanical engineering, based on the principles of (TD) Thermodynamics, (FM) Fluid Mechanics and Heat Transfer.”Refrigeration” is sometimes added to the field’s abbreviation, like HVAC & R or HVACR.

WHAT IS HVAC?

Heating, Ventilation & Air Conditioning

Heating
Heating is often used in the winter season (i:e cold climate ) to heat private houses or commercial buildings etc. Heaters are appliances whose purpose is to generate heat (i.e. warmth) the building. This can be done via central heating. Heating systems usually comprise of a boiler, furnace or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. There are three modes of heat transferred i:e conduction, convection, and radiation.

Ventilation

Ventilation is the process of changing or replacing the air in any space to control the temperature or remove any combination of moisture, odors, smoke, heat, dust, airborne bacteria, or carbon dioxide, and to return oxygen.
Ventilation includes both the exchange of air with the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality (IAQ) in buildings. Two types of ventilation methods are used Mechanical (Forced) and Natural Ventilation types.

Air Conditioning
This system is used in Summer (i:e warm climate) Air conditioning (Referred to as A/C) is the process of removing heat and moisture from the interior of an occupied space, to improve the comfort of occupants.A/C can be used in both domestic and commercial environments. An air conditioning system provides cooling and humidity control for all or part of a building. Air-conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions. Outside, fresh air is generally drawn into the system by a vent into the indoor heat exchanger section, creating positive air pressure. The percentage of return air made up of fresh air can usually be manipulated by adjusting the opening of this vent. The typical fresh air intake is about 10%-15%.