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ntroduction to Refrigeration and Airconditioning 8. NTRODUCTON Refrigeration refers to the use of mechanical devices or heat activated devices for producing and maintaining the temperature in a region less than that of surroundings. American Society of Refrigerating Engineers defines refrigeration as the science of providing and maintaining temperature below that of the surrounding atmosphere. Refrigerating a region in reference to the human comfort is called air conditioning. Thus, air conditioning refers to maintaining a space for the human comfort i.e. temperature, humidity and ventilation are the parameters to be controlled. When refrigeration provides temperature below 50C then this is known as cryogenics. Equipment used for removing the heat continuously for maintaining low temperature in a space is called refrigerator and cycles on which it operates are called refrigeration cycles. The working fluids used for carrying away heat are called refrigerants which are used in both refrigeration and air conditioning equipments. Equipment used for air conditioning are called airconditioners. The air conditioning of space may also be the requirement of various goods, equipments and processes etc. When air conditioning is done for human comfort then it is called comfort air conditioning while when it is done for industrial purposes then it is called industrial air conditioning. Comfort air conditioning can be further categorized as summer air conditioning and winter air conditioning. Summer air conditioning is used in summer season and generally requires cooling and dehumidification. Winter air conditioning used in winter generally requires heating and humidification. Comfort air conditioning is extensively used in residential buildings, hospitals, offices, working spaces, vehicles, trains, aeroplanes etc. ndustrial air conditioning is used for spot cooling/heating, environmental laboratories, printing industry, textile industry, precision parts manufacturing, computer rooms of power plants etc. Refrigeration is extensively used for increasing the storage life of perishable items specially food products, vegetables, fruits, milk, beverages, chilling of water, ice formation etc. along with industrial applications in chemical manufacturing, petroleum refinery, petrochemical plants, paper and plup industry etc. History of refrigeration system dates back to 834 when Jacob Perkins had got first patent on mechanical type refrigeration system using ether as refrigerant. First successful commercial refrigeration system was produced in 857 by James Harrison and D.E. Siebe using ethyl ether as refrigerant. Refrigeration can be achieved by using refrigeration cycle which may be open cycle type or closed cycle type.

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