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: 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 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.
HVAC stands for heating, ventilating, air-conditioning. Many times the letter R is also added to it making it HVAC-R or HVACR.
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.
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.
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.
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.