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.
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Heat pump is the devise which is used to heat the room room winter seasons. All the components of heat pump are exactly same as the air conditioner and refrigerator, the only difference is that they work in reverse direction.
HVAC stands for heating, ventilating, air-conditioning. Many times the letter R is also added to it making it HVAC-R or HVACR.
The HVAC stands for Heating, ventilating and air-conditioning. Traditionally the mechanical engineers have mostly been employed as the HVAC engineers by most of the companies.
Heat is the form of energy that flows from body at high temperature to the body at low temperature. There are three modes of heat transfer: conduction, convection and radiation. Some media is required for transfer of by conduction and convection, but for radiation no media is required.
Discussion about heat transmission and how it affects HVAC-R performance.
When the substance is heated its temperature increases and when the susbtance is cooled its temperature reduces. The amount of heat required to added to the susbtance to increase it temperature by unit degree is called as the specific heat of the susbtance.
The amount of heat required to change the phase of the substance is called as the latent heat of substance. There are three phases of substance: solid liquid and gaseous, accordingly there are three types of latent heats.
The two systems are said to be in thermodynamic equilibrium wih each other when they are in mechanical, chemical and thermal equilibrium with each other. Here are various types of equilibrium and the conditions for thermodynamic equilibrium of the system.
Tight competition exists in the semiconductor industry where manufacturers squeeze their schedules to research, develop and produce new products in order to keep-up with their competitors. Here are some potential solutions for a competitive HVAC semiconductor cleanroom.
(ASHRAE) has been responsible for promoting research and development in the heating, refrigerating and air-conditioning field. It has also developed a number of codes and standards for testing, designing and operation of HVAC.
In the very earlier days carbon-dioxide and ammonia were used as refrigerants. With the increasing applications of refrigeration and air conditioning, a number of new refrigerants were found. Of these the most popular are the halogenated hydrocarbons.
The chlorine atoms present in CFC refrigerants are the cause of depletion of the ozone layer and greenhouse effect. Chlorine reacts with ozone and converts it into oxygen.
Halogenated hydrocarbons have been extensively used as refrigerants. The refrigerants that contain chlorine as one of the atoms in their compounds cause ozone depletion and greenhouse effect. Chlorofluorocarbons or CFCs have a major effect on the ozone layer.
Of the various types of air conditioners, the best ones for your home or office are window and split air conditioners. The window air conditioners are fitted in the wall, while the split air conditioner has two parts, one inside the room and the other outside.
A number of software programs have come on the market that make complex HVAC design and heat load calculations very simple. Here one such product named AutoCAD HVAC Design software is described.
Refrigerants are the life blood of the vapor compression system. The refrigerant flows continuously through the vapor compression cycle, absorbing the heat in the evaporator and releasing it in the condenser. It undergoes various phase changes while flowing though the cycle.
The human body is like a machine that consumes fuel and produces power and heat. When the body consumes food, which contains lots of calories, it gets converted partially into energy and partially into heat. To attain body comfort, the excess heat generated inside the body should be removed.
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.
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.