Air Conditioning & Refrigeration ME-604A Contracts: 3L Credits- 3 Module 1 Introduction: Concepts of Refrigeration and Air-conditioning. Unit of refrigeration, Refrigerants – Desirable Properties, Nomenclature [02] Module 2 Simple Vapour Compression Refrigeration System(Simple VCRS): Vapour compression cycle on p-h and T-s diagrams. Cycles with subcooling and superheating, their effects; Effect of changes in evaporator pressure and condenser pressure on the performance of a simple VCRS; dry compression and wet compression of refrigerant; actual Vapour Compression Cycle. [06] Module 3 Air Refrigeration System (ARS): Bell-Coleman refrigerator. COP determination, actual air-refrigeration cycle. [03] Module 4 Vapour Absorption Refrigeration System (VARS): Advantages of VARS over VCRS. Working principle of simple VARS, practical VARS. Limitations of VARS, maximum COP of a VARS, Lithiumbromide-water System; Aquaammonia systems. [04] Module 5 Equipment and Control: Major Refrigeration Equipment - Compressors: Types; reciprocating, rotary & centrifugal, volumetric efficiency, Condensers: types used in refrigeration systems; Evaporators: expansion devices: capillary tubes and thermostatic expansion valves. [06] Module 6 Ventilation – Definition & Requirement, Natural & Mechanical Ventilation, Ventilation Load Calculation [03] Module 7 Basic definitions and principles related to Psychometry ; Psychometric Charts & Their Uses; Heating, Cooling, Heating & Humidification & Cooling & Dehumidification processes. Adiabatic Saturation, Cooling Coils*, By-pass Factor. [06] Module 8 Sensible Heat Factors. Heat Load estimation: Simple cases of Cooling and Dehumidification. [04] Module 9 Duct Sizing & Design. [02] Module 10 Air-conditioning equipment: ** Airhandling units, Cooling Towers. [04] *shifted from10 (as it is more related to the by-pass factor) **”chillers” already included as evaporators in Topic 5 Note: Some of the changes are suggested as discussed with ISHRAE Kolkata Chapter. Total no. of lectures = 40 + 2 C.T. = 42 Texts & References: 1. Refrigeration and Air Conditioning –Stocker & Jones, Mcgraw Hill 2. Refrigeration and Air Conditioning –C.P. Arora 3. Refrigeration and Air Conditioning –P L Ballaney 4. Refrigeration and Air Conditioning –R.C.Arora, TMH

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