Refrigeration and air conditioning are two interconnected fields of engineering that involve the control of temperature, humidity, and air quality to provide comfort, preserve goods, and enable industrial processes. They rely on principles of thermodynamics, heat transfer, and fluid mechanics to operate efficiently. The course starts with the focus on Refrigeration which is the process of removing heat from a space or substance to lower its temperature and maintain it below the surrounding environment with the help of the key components such as the Compressor which Compresses the refrigerant to increase its pressure and temperature, Condenser that rejects heat from the refrigerant to the surroundings, turning it into a liquid, Expansion Valve that reduces the pressure of the refrigerant, lowering its temperature and Evaporator that Absorbs heat from the desired area, causing the refrigerant to evaporate and cool the space. The course also comprises of modules on Air conditioning which is a process of controlling temperature, humidity, and air circulation to maintain comfort in indoor spaces encompassing residential, commercial, and industrial needs to provide cooling and, in some systems, heating. The air conditioning modules covers various units such as the Central Air Conditioning that provides cooling to large buildings through a duct network, Split Systems which has separate indoor and outdoor units for smaller spaces, Window Units which are compact systems that cool a single room and Heat Pumps that provide both cooling and heating by reversing the refrigeration cycle.
Thus the course on Refrigeration and air conditioning provides an insight into various refrigeration systems and equipments, refrigerants and lubricants, refrigerant flow controls, applications of refrigeration systems, air conditioning systems and tools used for Refrigeration and air conditioning.
Course outcomes:
At the end of the course the participants will be able to
Define refrigeration and types of refrigeration cycles
Explain vapour compression and vapour absorption system working principles
Identify the components required for refrigeration system.
Identify the controlling components for a refrigeration system
Explain the working principle of air conditioning
| Course Status : | Completed |
| Course Type : | Not Applicable |
| Language for course content : | English |
| Duration : | 8 weeks |
| Category : |
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| Credit Points : | 3 |
| Level : | Diploma |
| Start Date : | 20 Jan 2025 |
| End Date : | 15 May 2025 |
| Enrollment Ends : | 28 Feb 2025 |
| Exam Date : | 17 May 2025 IST |
| Translation Languages : | English |
| NCrF Level : | 4.5 |
| Industry Details : | Teaching |
Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.
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swayam@nitttrc.edu.in, swayam@nitttrc.ac.in
Week1: Introduction to Refrigeration
Definition of Refrigeration – Refrigerating effect – unit of refrigeration – Coefficient of performance – Types of refrigeration – Ice, Dry ice, Steam jet, Throttling, Liquid nitrogen refrigeration - Carnot refrigeration Cycle; Air refrigeration- Bell - Coleman cycle, PV& TS diagram; Advantage and disadvantages in air refrigeration; Simple problems
Week 2: Refrigeration systems:
Basic components – Flow diagram of working of vapour compression refrigeration cycle – Representation of vapour compression cycle on P-H, T-S & P-V Diagram- Expression for Refrigerating effect - work done and power required - Types of Vapour Compression cycle - Effects of super heating and under cooling, its advantages and disadvantages - Simple Vapour absorption cycle and its flow diagram – Simple Electrolux system for domestic units – Comparison of vapour absorption and vapour compression system – Simple problems on vapour compression cycle.
Week 3: Refrigeration equipments:
Compressor - types of compressors; Hermetically sealed and Semi hermetically sealed compressor; Condensers - Air Cooled, water cooled, natural and forced draught cooling system; Advantages and disadvantages of air cooled and water cooled condensers; Evaporators -natural, convection, forced convection types.
Week 4 : Refrigerants and Lubricants:
Introduction to refrigerants – Properties of good refrigerants – Classification of refrigerants by group number and commonly used refrigerants in practice – Detection of refrigerant leakage – Charging the system with refrigerant – Lubricants used in refrigeration and their properties.
Week 5 : Refrigerant flow controls:
Capillary tube – Automatic expansion valve – Thermostatic expansion valve – High side and low side float valve – Solenoid valve - Evaporator pressure regulator.
Week 6: Application of refrigeration:
Slow and quick freezing - Cold storage and Frozen storage - Dairy refrigeration - Ice making industry - Water coolers.
Week 7: Air conditioning:
Introduction to Air conditioning - Factors affecting Air conditioning- Psychometric chart and its use- Psychometric process-sensible heating and cooling - Humidifying and dehumidifying - Adiabatic saturation process - Equipments used in air conditioning cycle - Air conditioning units and plants.
Week 8: Refrigeration and Air conditioning tools:
Tools used in refrigeration and Air conditioner installation - Installation procedure- Faults in refrigeration and air conditioning system - Servicing procedure.
Refrigeration and Air Conditioning – Sadhu Singh, Khanna Book Publishing Co., New Delhi
Refrigeration and Air Conditioning – S. Domakundawar, Dhanpat Rai publications.
Refrigeration and Air Conditioning – A.S.Sarao & G.S. Gabi, 6th edition, Satya Prakashan publications, New Delhi, 2004.
Principles of Refrigeration – Roy J.Dossat, 5th edition, Pearson Publications, 2001
Refrigeration and Air Conditioning, Zakira Baig, Premier/Radiant Publishing House
Refrigeration and Air Conditioning – C.P Arora, Tata McGraw Hill Education, 2000.
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