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# PPT ON REFRIGERATION.pptx

ASSITANT PROFESSOR à KCNIT BANDA
25 Dec 2022
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### PPT ON REFRIGERATION.pptx

1. KALI CHARAN NIGAM INSTITUTE OF TECHNOLOGY, BANDA LECTURE ON INTRODUCTION TO REFRIGERATION FUNDAMENTAL OF MECHANICAL ENGINEERING (BME101) BY : DEEPAK KUMAR YADAV ME DEPARTMENT
2. REFRIGERATION The term refrigeration may be defined as the process of removing heat from a substance under controlled conditions. In other words the refrigeration means a continued extraction of heat from a body whose temperature is already below the temperature of its surrounding.
3. REFRIGERATING EFFECT The rate of heat absorbed from a body to be cooled is called refrigerating effect. Refrigerating effect : It is amount of heat energy removed per unit time from the space to be cooled by the refrigeration process. It is expressed in KW or KJ/s.
4. TON OF REFRIGERATION  The practical unit of refrigeration is expressed in terms of ‘ ton of refrigeration’ (TR). A ton of refrigeration is defined as amount of refrigerating effect produced by the uniform melting of one ton (1000kg) of ice from and at 0oC in 24 hours. Latent heat of ice = 335 Therefore one ton of refrigeration 1 TR = 1000×335 KJ in 24 hr = = 232.6 KJ/min In actual practice, one ton of refrigeration is taken as equivalent to 210 KJ/min or 3.5 KW.
5. HEAT ENGINE  Heat engine is the device which converts chemical energy of fuel into heat energy and this heat energy is utilized converting it to mechanical work.  Thermal efficiency : The ratio of net work output to the entire amount of heat supplied to the working medium.
6. THERMAL EFFICIENCY OF HEAT ENGINE The work extracted is equal to the difference between the heat energy transferred from the hot reservoir and the heat exhaust into cold reservoir:  Thermal efficiency =
7. HEAT PUMP Heat pump is a device is used to maintain a higher temperature as compared to surrounding by supplying heat to system.  Coefficient of Performance (COP): COP of a heat pump is expressed by ratio of amount of heat delivered To hot body to amount of work required to be done on the system
8. REFRIGERATOR Refrigerator is a device is used to maintain a lower temperature as compared to surrounding by absorbing heat from the system.
9. THANK YOU
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