Unit 1 Unit-1 Introduction

5 lecture hours

• 1.1Definition of Refrigeration and air-conditioning. 1.2 Refrigerating effect
• unit of refrigeration
• Coefficient of performance. 1.3 Types of Refrigeration-Ice
• dry ice, Steam jet, Throttling
• Liquid nitrogen refrigeration 1.4 Carnot refrigeration Cycle on PV & TS diagrams 1.5 Air refrigeration cycle (Reverse Brayton or Bell - Coleman cycle) on PV& TSdiagrams. 1.6 Advantages
• disadvantages and applications of air refrigeration cycles. 1.7 Simple numerical on Reverse Brayton cycle

Unit 2 Unit-2 Vapor Refrigeration Systems

10 lecture hours

• 2.1 Flow diagram with basic components of Vapor Compression Refrigeration system. 2.2 Representation of the vapor compression cycle on P-H
• 2.3 Expression for Refrigerating effect and coefficient of performance. 2.4 Effects of changes in operating conditions (sub-cooling
• super heating of suction vapor and change in suction pressure of compressor) on performance of vapor compression refrigeration cycle. 2.5 Simple Vapor absorptions cycleand its flow diagram
• 2.6 Simple Electrolux system for domestic units 2.7 Comparison of Vapor absorption and vapor compression system. 2.8 Simple numerical on vapor compression cycle

Unit 3 Unit-3 Common Equipments and refrigerants of Vapor

• Compression Refrigeration System. 15 36 Program Name: Diploma Engineering Level: Diploma Branch: Mechanical Engineering Subject Code: DI05019051 Subject Name: Refrigeration and Air Conditioning 3.1Common equipments of Vapor Compression Refrigeration System with classification
• advantage and disadvantages
• (A)Compressors (B)Condensers (C)Evaporators (E) Expansion devices 3.2 Refrigerants and lubricants: a) Classification of refrigerants b) Properties of refrigerants c) Commonly used refrigerants in practiceand green refrigerants d) Detection ofrefrigerants leakage e) Charging the system with refrigerant f) Lubricants used in refrigeration and their properties

Unit 4 Unit-4 Air conditioning

10 lecture hours

• 4.1 Air conditioning: Introduction
• classification and applications of Air conditioning. 4.2 Psychometric Properties of air 4.3 Psychometric chart and its use
• 4.4 Psychometric processes-sensible heating and cooling
• Humidifying anddehumidifying
• Adiabatic saturation process. 4.5 Air conditioning units and plants. a) Desert cooler b) Window air conditioner c) Split air conditioner d) Ducts in air conditioning systems e) Air Filters in air conditioning systems 4.6 Simple numerical on Psychometric Properties of air

Unit 5 Unit-5 Installation and Maintenance of Refrigeration and Air-

5 lecture hours

• conditioning units. 5.1 Tools used in refrigeration and Air conditioner installation and maintenance
• 5.2 Installation of Refrigeration and Air-conditioning units. 5.3 Faults in refrigeration and air conditioning systems. 5.4 Servicing procedure of Refrigeration and Air-conditioning units