HVAC and Ventilation
Overview of HVAC System
HVAC stands for Heating, Ventilation and Air Conditioning. The main idea behind this system is that it provides cooling and heating to both residential and commercial buildings. HVAC is important in the design of medium to large industrial applications like power plants, onboard vessels, office buildings such as skyscrapers, and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to fresh air, temperature, and humidity.
Air conditioning ranges from simple air conditioning by use of packaged type window AC and single-split AC where cooling, minor filtration, and dehumidifying, is done ,to much complicated air conditioning systems used in process plants, vessels, laboratories, and centrally air-conditioned office buildings.
Objectives of HVAC
It is to control the air condition inside the designated space such as temperature, humidity, air quality, supply of outside fresh air for control of oxygen and carbon dioxide levels, and finally, control of the movement of air or draught. Managing these factors equate to a successful HVAC system. Air conditioning has changed over the years from just cooling of a space to the effective control of all the above parameters. The key of HVAC is keeping an area at a desired temperature.
Types of Air Conditioning Systems
Different types of air conditioning systems are recommended for different applications. The most used are described henceforth.
The choice of which air conditioner system to use depends upon several factors including how large the area is to be cooled, the total heat generated inside the enclosed area, etc. all the related parameters are considered and the system most suitable for your space suggested.
- Window Air Conditioner
Window air conditioner is the most used air conditioner for single rooms. In this air conditioner, all the components, namely the compressor, condenser, expansion valve or coil, evaporator and cooling coil are enclosed in a single box. This unit is fitted in a slot made in the wall of the room, or more commonly a windowsill.
- Split Air Conditioner
The split air conditioner comprises of two parts: the outdoor unit and the indoor unit. The outdoor unit, fitted outside the conditioned room, houses components like the compressor, condenser and expansion valve. The indoor unit comprises the evaporator or cooling coil and the cooling fan. For unit you do not require any slot in the wall of the room. Further, present day split units have aesthetic appeal and do not take up as much space as a window unit. A split air conditioner can be used to cool one or two rooms (Multi Split).
- Packaged Air Conditioner
This type of air conditioner is suggested if one wants to cool more than two rooms or a larger space at your home or office. In this arrangement, all the components, namely the compressor, condenser (which can be air cooled, or water cooled), expansion valve and evaporator are housed in a single box. The cooled air is thrown by the high-capacity blower, and it flows through the ducts laid through the large space or various rooms.
- Central Air Conditioning System
Central air conditioning is used for cooling big buildings, apartment buildings, offices, entire hotels, gyms, movie theatres, factories etc. If the whole building is to be air conditioned, putting individual units in each of the rooms is very expensive making this a better option. A central air conditioning system is comprised of a high-capacity condensing unit that has the capacity to produce hundreds of tons of cooling. Cooling big halls, malls, huge spaces, galleries etc is usually only feasible with central conditioning units.
Components of an HVAC System
There are two main components of a HVAC system. These two parts are the air handler, heating and cooling system, and the heat exchanger. In most cases, the heat source is some type of furnace/boiler. In an air conditioning system, the cooling system is composed of several unique subcomponents varying for different HVAC systems.
Types of Air Conditioning Systems
Different types of air conditioning systems are recommended for different applications. The most used are described henceforth.
The choice of which air conditioner system to use depends upon several factors including how large the area is to be cooled, the total heat generated inside the enclosed area, etc. all the related parameters are considered and the system most suitable for your space suggested.