Latent heat is important in the operation of an air conditioning system because the cooling effect is derived from changing the state of liquid refrigerant to vapor. This liquid changes to gas and evaporates as it extracts heat from the air around it and in low pressure conditions it again gets converted to liquid and after entering into the normal pressure region this again changes into gas. Standard air is dry air at sea level with a temperature of 70f. Heat flow is a basic principle of refrigeration in fact, of all hvac work. For air conditioning calculations, the value of standard air is used for altitudes up to. It wasnt practical and couldnt be used for cooling food but it was a start. In this, the outside air flows through the damper and mixed with the recirculated air. L, refrigeration and airconditioning, khanna publishers, new delhi, 2014 t4 manohar prasad, refrigeration and airconditioning, new age international, 2011 r1 stoecker w. These refrigerants which provide a cooling effect during the phase change from liquid to vapor are commonly use in refrigeration, air conditioning and heat pupm systems. In this course of refrigeration and airconditioning, you will find all the important topics related to refrigeration and airconditioning. Working principle, advantages, disadvantages, application, pdf march 22, 2019. Working principle of refrigeration and air conditioning pdf. J, principles of refrigeration, pearson education india, 2002 r3 ashrae.
The refrigeration cycle and air conditioning cycle basics are covered stepbystep, to give a complete understanding on the refrigerator and air conditioner working principle. The outside air flows through a damper and mixes with the recirculated air. This liquid changes to the gas and evaporates as it extracts heat from the air around it and under low pressure conditions it is converted into liquid again and after entering the normal pressure range it is. For air conditioning calculations, the value of standard air is used for altitudes up to 2,000 ft.
Working substance in air conditioning is the moist air which is a mixture of two gases. Mechanical refrigeration works by changing the the majority of heat is removed from the the majority of the works by removedchanging the absorbed heat is state of the refrigerant. You dont have to be an airconditioning expert to use spot coolers, but understanding the basics of air conditioning will help you understand how spot coolers work. Air conditioning theory there are two laws that are significant to understand the basic refrigeration cycle and air conditioning. An air conditioner collects hot air from a given space, processes it within itself with the help of a refrigerant and a bunch of coils and then releases cool air into the same space where the hot air had originally been collected. An central air conditioning system includes both the cooling and heating of air and cleans the air as well as controls the moisture level. Nov 15, 2015 refrigerator working principle the working principle of a refrigerator and refrigeration, in general is very simple. Almost all heat pumps work on the principle of the vapour compression cycle. Pdf refrigeration and air conditioning third edition johana c. The compressor is driven by the engine through a belt drive. Materials as printouts and additionally also as pdf files. But your air conditioner actually removes warm air and recirculates it as cool air.
Sep 22, 2015 the working of automotive air condition system is similar to all other air conditioning system. The science behind refrigeration berg chilling systems inc. It is defined as the ratio of the heat absorption from an evaporator to the work. They design, install and maintain refrigeration and hvac heating, ventilation and air conditioning systems. Refrigeration training course air conditioner working principle. Introduction and basic concepts of refrigeration and air conditioning. Refrigeration and air conditioning technology gunt hamburg. F, refrigeration and airconditioning, mcgrawhill publishing company, 2009 r2 dossat.
Refrigeration and air conditioning technology 7th edition pdf by william c. The four types of refrigeration systems you need to know. The refrigeration system comprises of various components like freon gas, compressor, condenser, evaporator, thermostat etc, which are all enclosed in a casing. Heating and airconditioning principles 5 element that expands and contracts, based on the humidity. Basic principles of refrigeration air conditioning, heating. This animation shows ac working flow at both hot weather and cold weather, and demonstrates how 4way valve works to switch between two. This section highlights some of the basic principles of air conditioning for those who would benefit from additional knowledge in this area. An introduction to the basic principles and practices of. Is the process of removing the undesirable heat from a given body to maintain it at a desired lower temperature. This is the series of articles that describes the difference between the refrigeration compressors and air compressors, types of refrigeration compressors, principle of working of the reciprocating compressors and parts of the reciprocating compressors. Refrigeration and air conditioning has a wide range of applications today.
Refrigerant is the fluid that circulate in the refrigeration machine and absorbing heat during evaporation. There is a direct relationship between the nature and. May 21, 2007 as air heats up, it expands and therefore weighs less. The refrigerant vapour from the evaporator is compressed to high pressure by the compressor. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. Jan 08, 20 this video describes the working principle of an air conditioner. Working principle of refrigerators how refrigerators work. Refrigeration and air conditioning technology 7th edition pdf. Miller professor, industrial technology the university of texas at tyler tyler, texas mcgrawhill new york chicago san francisco lisbon london madrid mexico city milan new delhi san juan seoul singapore sydney toronto. Intensive properties do not depend on the size of the system e. The compressor constricts the refrigerant vapor, raising its pressure and temperature, and pushes it into the coils of the condenser on the outside of the refrigerator. Refrigeration and air conditioning training course principles. Working principle of air conditioner, animation by.
The refrigeration system requires some means of connecting the basic major components evaporator, compressor, condenser, and metering device just as roads connect communities. Hygrometers typically resemble a clock, with the scale reading from 0% to 100% relative humidity. The stirling refrigerator consists of a working cylinder 6. The working fluid called refrigerant completes its function upon evaporation during which it absorbs the heat in an amount equivalent to its refrigerating effect. This book has been written especially for use in programs where a full curriculum in refrigeration is offered. However, the material covered and the method of presentation are such that the text is also suitable for adult evening classes and for onthejob training and selfinstruction. Air conditioner working principle in yearround air conditioning system. John gorrie 1803 1855, an early pioneer in the invention of the artificial manufacture of ice, refrigeration, and air conditioning, was granted the first u. F, refrigeration and air conditioning, mcgrawhill publishing company, 2009. Refrigeratordefinition, main parts or component, working principle, advantages, disadvantages, application, pdf march 22, 2019 difference between vapour compression and vapour absorption refrigeration system with pdf.
It uses the evaporation of a refrigerant, like freon, to provide cooling. The most commonly used refrigeration machines are the household refrigerator and deep freezer, though these machines are available in many other forms. The refrigeration and air conditioning training course is a complete reference on the topic. Difference between vapour compression and vapour absorption refrigeration system with pdf february 4, 2019. How air conditioning works the essential ingredients in an air conditioning system are a fan to blow air around, a cold surface to cool and dehumidify the air, a warm surface and a source of water vapour. When you pass a lowtemperature liquid close to objects that you want to cool, heat from those objects is transferred to the liquid, which. Specifically, all air systems, allwater systems, and air water systems are discussed.
No doubt, rac engineering has a great future ahead. Pdf refrigeration and air conditioning third edition. Tubing or lines make the system complete so that the refrigerant will not leak out into the atmosphere. The principle of refrigeration is to remove heat from one area i. A refrigeration and air conditioning engineer works on commercial, residential and industrial projects. Refrigeration and air conditioning training course principles of refrigeration 32 hours, 32 nate cehs, 3. However, first lets understand air conditioning theory, the basic principle, types of heat, how heat transfers and i will show you how the basic refrigeration cycle diagram works. A refrigeration and air conditioning engineer works on commercial, residential, public, and industrial projects, including transportation and storage. Extensive properties depend on the size of the system e,g, volume, internal energy, enthalpy, etc. Figure 16 a combination meter that measures and displays both the temperature and the humidity is useful to use. In a large system there will also be a tangle of tubes to distribute the air and collect it again.
This warming and cooling of the air is usually referred to as winter and summer air conditioning. Schematic for a modern summer yearround air conditioning is arranged. In this course of refrigeration and airconditioning, you will find all the important topics related to refrigeration. As air heats up, it expands and therefore weighs less. Parts, working principle, advantages, disadvantages and applications pdf by mohammed shafi may 6, 2020 may 22, 2020 hotchkiss drive is the most widely used type of rear axle drive. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle.
The basic principles are those of thermodynamics, and these principles as. Others perfected method and, after many experiments, patents and industrial models, in 1915 a practical household refrigerators were introduced. Introduction and basic concepts of refrigeration and air. Air conditioning system working principle animation youtube.
Air conditioning and refrigeration rex miller professor emeritus state university college at buffalo buffalo, new york mark r. L, refrigeration and air conditioning, khanna publishers, new delhi, 2014 t4 manohar prasad, refrigeration and air conditioning, new age international, 2011 r1 stoecker w. Vapour compression refrigeration system using ammonia as refrigerant is widely used in india for industrial refrigeration, air conditioning. For example, in the refrigeration cycle, the evaporator cooling coil is.
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