Introduction of refrigeration
- 1. SHARAD INSTITUTE OF TECHNOLOGY COLLEGE OF ENGINEERING, YADRAV Prof. Avesahemad S. N. Husainy Assistant Professor, Department of Mechanical Engineering Member of ISHRAE and ASHRAE (Applied Thermodynamics-II) Introduction of Refrigeration https://www.youtube.com/channel/UCPVNu2txpcsFU2eZf0DPRsg linkedin.com/in/avesahemad-husainy-54507aa3 https://classroom.google.com/w/NTYyMjQxO Class Code: on4uvhh
- 2. Definition Refrigeration is a process that removes heat from a space, substance, or system to lower and/or maintain its temperature below the ambient temperature. Unit of refrigeration A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the rate of heat transfer that results in the melting of 1 short ton of pure ice at 0 °C (32 °F) in 24 hours. Applications of Refrigeration For convenience of study, refrigeration applications may be grouped into 4 general categories: 1. Domestic refrigeration. 2. Commercial refrigeration. 3. Industrial refrigeration. 4. Marine and transportation refrigeration. Introduction
- 3. It includes, • It include the study of second law of thermodynamics (Clausius Statement): Clausius Statement from the second law of thermodynamics states that: “It is impossible to design a device which works on a cycle and produce no other effect other than heat transfer from a cold body to a hot body.” That is, heat transfer can only occur spontaneously in the direction of temperature decrease. • It includes study of heat pump and refrigerator. • Also studies of different thermodynamic process are come under these points. • Thermal cycle is also part of this point. Thermodynamics of refrigeration
- 4. Vapor compression refrigeration cycle Advantages: • COP is high • Evaporator size required is smaller • Controlling is easy • Operation temperature range is huge • Volume of refrigerant circulation is low Applications: • Domestic refrigerator • Air conditioner • Cold storage • Ice plant • Dairy outlets. Disadvantages: • High initial investment • High cost of refrigerants • Noise is more • Environmental hazardous because of refrigerants • Leakage problems
- 5. PH andTS of VCR
- 6. Vapor absorption refrigeration system (Aqua ammonia system) Advantages: • The whole system will operated at huge temperature range • Circulation volume of refrigerant is low which reduces the running cost • Evaporator size is also small when compared with others • Coefficient of performance will be very high here Disadvantages: • Efficiency of absorption system will be very low when compared with others • Time to quotient will be high so as to produce cooling effect