Course Details
Subject {L-T-P / C} : ME4333 : Refrigeration and Air-Conditioning { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. S. Murugan
Syllabus
MODULE 1
Introduction, COP, Carnot refrigeration cycle, Air refrigeration cycle , Bell Coleman air refrigeration cycle, Refrigerants-Primary and secondary refrigerants, nomenclature, ecofriendly refrigerants, vapour compression system- Single stage system , analysis of theoretical vapour compression cycle, effect of pressure change on COP , Use of T-S & p-h charts , effect of subcooling of condensate on COP& capacity , effect of superheating of vapour compression, two fluid and three fluid refrigeration systems.
MODULE 2
Compressors, Single stage compression and multistage compression systems, Evaporators, multi-evaporator system, Condensers, Expansion devices, cooling towers. Effects of condenser and evaporator pressure on COP-multi pressure system-low temperature refrigeration-Cascade systems- problems.
MODULE 3
Steam jet refrigeration- Ejector refrigeration systems- Thermoelectric refrigeration-Air refrigeration – Magnetic – Vortex and Pulse tube refrigeration systems, Aircraft refrigeration.
MODULE 4
Properties of air-vapour mixture, Law of water vapour-air mixture, Enthalpy of moisture, Adiabatic saturation, Psychrometric chart, Simple heating and cooling, Humidification, Dehumidification, Mixture of air streams.
MODULE 5
Requirements of comfort air conditioning: Oxygen supply, Heat removal, moisture removal, air motion, purity of air, Thermodynamics of human body, comfort and comfort chart, effective temperature, factors governing optimum effective temperature , Air Conditioning System: Process in air conditioning : Summer air conditioning, Winter air conditioning and year round air conditioning, Cooling load calculations.
Course Objectives
- To educate the students the basics of refrigeration, unit of refrigeration, different thermodynamic cycles followed and conventional and unconventional refrigeration systems.
- To make the students to understand classification of primary refrigerants, secondary refrigerants, their designations and their different properties. To make the students to learn different refrigerants available for refrigeration and air conditioning applications.
- To make the students to learn different refrigeration equipment such as evaporator, compressor, condenser and expansion devices. To make the students to solve problems related to different conventional and unconventional refrigeration systems.
- To make the students to learn air water mixtures, empirical relations used to calculate desirable properties air water vapour mixture, different psychrometric properties and their use in air conditioning applications. Also to make the students to learn how to thermodynamically analyse refrigeration and air conditioning systems and evaluate performance parameters. The should also know heat load calculations for desigining air conditioning. Apply the principles of psychometrics to design the air conditioning loads for the industrial applications.
Course Outcomes
At the end of the course, the student should be able to differentiate between different types of refrigeration systems with respect to application as well as conventional and unconventional refrigeration systems. Thermodynamically analyse refrigeration and air conditioning systems and evaluate performance parameters. Apply the principles of Psychometrics to design the air conditioning loads for the industrial applications.
Essential Reading
- C P Arora, Refrigeration & air conditioning, Tata McGraw Hill , 3rd Edition
- Arora and Domkundwar, Course in Refrigeration and Air conditioning, Dhanpat Rai & Sons.
Supplementary Reading
- Stoecker, W. F. Jones, J. W. Stoecker, Wilbert F., Refrigeration and Air Conditioning, McGraw-Hill Science
- Roy J. Dossat, Principles of Refrigeration, Pearson Education