Basic Of Refrigeration And Air Conditioning Pdf

basic of refrigeration and air conditioning pdf

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Lesson 3. Lesson 5. Effect of change of operation conditions on the working of vapour compression refrigeration plant. Lesson Importance of Multiple evaporator and compressor systems, Multi evaporator and one compressor systems.

How does air conditioning work?

This section highlights some of the basic principles of air conditioning for those who would benefit from additional knowledge in this area. Heat is a form of energy. Every object on earth has some heat energy. The less heat an object has, the colder we say it is. Cooling is the process of transferring heat from one object to another. When an air-conditioning system cools, it is actually removing heat and transferring it somewhere else.

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Introduction and Basic Concepts of Refrigeration and Air Conditioning, PDF

One very important part of all HVAC systems is the basic refrigeration cycle. It contains four major components: the compressor, condenser, expansion device, and evaporator. The system pipes refrigerant through these four components in a loop, giving the cycle its name and keeping your home cool! The refrigerant in your system starts as vapour in the first component of the cycle, the compressor. The compressor forces the refrigerant through the system, squeezing the cool refrigerant and turning it into a very hot, high-pressure vapour.

Refrigeration

Mechanical refrigeration is accomplished by continuously circulating, evaporating, and condensing a fixed supply of refrigerant in a closed system. Evaporation occurs at a low temperature and low pressure while condensation occurs at a high temperature and high pressure. Thus, it is possible to transfer heat from an area of low temperature i. Referring to the illustration below, beginning the cycle at the evaporator inlet 1 , the low-pressure liquid expands, absorbs heat, and evaporates, changing to a low-pressure gas at the evaporator outlet 2.

The work of energy transfer is traditionally driven by mechanical means, but can also be driven by heat, magnetism , electricity , laser , or other means. Refrigeration has many applications, including household refrigerators , industrial freezers , cryogenics , and air conditioning. Heat pumps may use the heat output of the refrigeration process, and also may be designed to be reversible, but are otherwise similar to air conditioning units. Refrigeration has had a large impact on industry, lifestyle, agriculture, and settlement patterns.

This process is accompanied by an increase in Entropy along with a drop in pressure due to which volume increases and a part of the liquid is vaporized, thus cooling the liquid. Real gases produce a substantial decrease in temperature under certain condition, which corresponds to a certain initial low temperature and high pressure of the gas. Cooling is produced of one junction of two dissimilar metals if a current is passed through them. The phenomenon is called the Peltier effect. The heat rejected to the surroundings equals the heat absorbed from the cold body or refrigeration produced plus the work done or mechanical energy consumed.

Air-Conditioning and Refrigeration. Mechanical Engineering Handbook

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2 COMMENTS

Podasinni1957

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In the s, the introduction of microprocessor- based direct-digital control systems raised the technology of air conditioning and refrigeration to a higher level.

Kristi R.

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