RAC Lecture 14 - Lesson 14 Vapour Absorption Refrigeration...

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Lesson 14 Vapour Absorption Refrigeration Systems Version 1 ME, IIT Kharagpur 1
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The objectives of this lesson are to: 1. Introduce vapour absorption refrigeration systems ( Section 14.1 ) 2. Explain the basic principle of a vapour absorption refrigeration system ( Section 14.2 ) 3. Compare vapour compression refrigeration systems with continuous vapour absorption refrigeration systems ( Section 14.2 ) 4. Obtain expression for maximum COP of ideal absorption refrigeration system ( Section 14.3 ) 5. Discuss properties of ideal and real refrigerant-absorbent mixtures ( Section 14.4 ) 6. Describe a single stage vapour absorption refrigeration system with solution heat exchanger ( Section 14.5 ) 7. Discuss the desirable properties of refrigerant-absorbent pairs for vapour absorption refrigeration systems and list the commonly used working fluids ( Section 14.6 ) At the end of the lecture, the student should be able to: 1. List salient features of vapour absorption refrigeration systems and compare them with vapour compression refrigeration systems 2. Explain the basic principle of absorption refrigeration systems and describe intermittent and continuous vapour absorption refrigeration systems 3. Find the maximum possible COP of vapour absorption refrigeration systems 4. Explain the differences between ideal and real mixtures using pressure- composition and enthalpy-composition diagrams 5. Draw the schematic of a complete, single stage vapour absorption refrigeration system and explain the function of solution heat exchanger 6. List the desirable properties of working fluids for absorption refrigeration systems and list some commonly used fluid pairs 14.1. Introduction Vapour Absorption Refrigeration Systems (VARS) belong to the class of vapour cycles similar to vapour compression refrigeration systems. However, unlike vapour compression refrigeration systems, the required input to absorption systems is in the form of heat. Hence these systems are also called as heat operated or thermal energy driven systems. Since conventional absorption systems use liquids for absorption of refrigerant, these are also sometimes called as wet absorption systems. Similar to vapour compression refrigeration systems, vapour absorption refrigeration systems have also been commercialized and are widely used in various refrigeration and air conditioning applications. Since these systems run on low-grade thermal energy, they are preferred when low-grade energy such as waste heat or solar energy is available. Since conventional absorption systems use natural refrigerants such as water or ammonia they are environment friendly. Version 1 ME, IIT Kharagpur 2
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In this lesson, the basic working principle of absorption systems, the maximum COP of ideal absorption refrigeration systems, basics of properties of mixtures and simple absorption refrigeration systems will be discussed.
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This note was uploaded on 02/29/2012 for the course CHEMICAL 302 taught by Professor Nptel during the Spring '12 term at Birla Institute of Technology & Science.

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RAC Lecture 14 - Lesson 14 Vapour Absorption Refrigeration...

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