Chlorofluorocarbons (CFCs) have been found to cause the depletion of the ozone layer. The ozone layer prevents ultraviolet radiations of the sun from coming on the earth. This article describes the process of damaging effects of CFCs.
HVAC: Heating, Ventilation & Air-Conditioning
HVAC stands for Heating, Venitlation and Air-Conditioning. Within this topic you’ll find articles on how to choose the best air conditioner for your home or office, how refrigerators work, and all about designing a room for optimum ventilation.
Get expert advice and opinion at with our Mechanical Engineering articles, whether you’re tackling an at home project, getting informed before making your next purchase, or brushing up on technical info and stats.
The human body feels comfortable at certain values of temperature, relative humidity and velocity of air inside a room. These are called comfort conditions or comfort zone. They depend on a number of factors, which the HVAC designers should be aware of.
In throttling devices the pressure of the refrigerant drops down suddenly and due to this its temperature also reduces drastically. This article describes various types of throttling devices being used for refrigerator and air-conditioning systems.
In condensers the refrigerant gives up the heat that is has absorbed in the evaporator. There are three main types of condensers: air cooled condensers, water cooled condensers and evaporative condensers.
Window air conditioners are one of the most commonly used and cheapest type of air conditioners. To install one of these units, you need the space to make a slot in the wall, and there should also be some open space behind the wall.
Mechanical Engineering is one of the widest fields of engineering. It includes various fields like manufacturing processes, automobiles, thermal & hydraulic power plants, refrigerators & air-conditioners, aeroplanes, rockets, cryogenics, and much more.
The process of refrigeration is used for many day-to-day applications. It is used to chill water, make ice and ice cream, keep your food fresh and a host of other purposes. Let us try to know the basics of the refrigeration process.
This article describes the arrangement of compressors in the package air conditioners with multiple compressors. It also describes the capacity control system in these units.
There are four important parts of a refrigerator: compressor, condenser, expansion valve and evaporator. Freon gas passes through all these parts continuously in the form of a cycle and undergoes various phase and temperature and pressure transformations. Freon acts as the media for transfer of heat.
Central air conditioning plants are used for applications like big hotels, large buildings having multiple floors, hospitals, etc, where very high cooling loads are required. The article describes various possible arrangements of central air conditioning plants.
Air conditioning is the process of maintaining comfortable conditions inside a closed space. It controls temperature, humidity, air flow rate and the cleanliness of air inside a room.
In many cases especially in places of heavy rainfall, the dehumidification carried out by air-conditioners is not sufficient because the moisture content of the air is extremely high. In such cases portable dehumidifiers are very useful and convenient to use.
The HVAC system selected haphazardly for your home or office can turn out to be insufficient or highly expensive. For achieving comfortable conditions at optimum costs, HVAC design for your home or office is important.