REFRIGERATION AND AIR CONDITIONING B.Tech. IV Year I Sem. JNTUH R-18

• What are the different types of refrigeration systems and their applications?

• different types of refrigeration systems

• How is the unit of refrigeration and coefficient of performance (COP) defined?

• What is the difference between mechanical refrigeration and air refrigeration?

• Explain the ideal cycle of refrigeration and its limitations.

• Describe the Bell Coleman cycle and Brayton cycle for air refrigeration.

• What are the advantages and disadvantages of open and dense air systems?

• Discuss the applications of air refrigeration and the justification for using it.

• What are the different types of air refrigeration systems and their problems?

Unit II: Vapour Compression Refrigeration

• Explain the working principle and essential components of a vapour compression refrigeration plant.

• Describe the simple vapour compression refrigeration cycle and its COP.

• How is the cycle represented on T-S and p-h charts?

• What is the effect of subcooling and superheating on the cycle performance?

• Analyze the actual vapour compression refrigeration cycle and the factors affecting its performance.

• How can p-h charts be used to analyze refrigeration systems?

Unit III: System Components

• Classify compressors and compare their advantages and disadvantages.

• Describe the different types of condensers and their working principles.

• Explain the working principles of various types of evaporators.

• Discuss the different types of expansion devices and their working principles.

• What are the desirable properties of refrigerants and some common refrigerants used?

• Explain the concepts of ozone depletion and global warming in relation to refrigerants.

• What are azeotropes and zeotropes, and how are they used in refrigeration systems?

Unit IV: Absorption Refrigeration Systems

• Calculate the maximum COP of a vapour absorption system.

• Describe the working principle of NH3-water and Li-Br absorption systems.

• Explain the principle of operation of a three-fluid absorption system and its salient features.

• Describe the working principle of a steam jet refrigeration system and its basic components.

• Explain the principle and operation of thermoelectric refrigerators and vortex tubes.

Unit V: Introduction to Air Conditioning

• Define psychometric properties and processes, including sensible and latent heat.

• Explain the characterization of air conditioning loads and the need for ventilation.

• Discuss the load concepts of RSHF, ASHF, ESHF, and ADP.

• Describe the concept of human comfort and effective temperature.

• Explain the principles of comfort air conditioning and industrial air conditioning requirements.

• Perform air conditioning load calculations.

• Classify air conditioning equipment and explain the functions of cooling, heating, humidification, and dehumidification.

• Describe the role of filters, grills, registers, deodorants, fans, and blowers in air conditioning systems.

• Explain the concept of a heat pump, its heat sources, different heat pump circuits, and its applications.