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ME-801 Refrigeration & Air Conditioning Notes

5 notes for Refrigeration & Air Conditioning, unit by unit.

Unit 1 · Short notes Introduction Principles and methods of refrigeration, freezing · Mixture cooling by gas reversible expansion, throttling, evaporation, Joule‑Thomson effect and reverse Carnot cycle · Unit of refrigeration, coefficient of performance, vortex tube & thermoelectric refrigeration, adiabatic demagnetization · Air refrigeration cycles – Joule’s cycle, bootstrap cycle, reduced ambient cycle and regenerative cooling cycles
Unit 2 · Short notes Vapour Compression System Vapour compression cycle, p‑h and t‑s diagrams · Deviations from theoretical cycle, sub‑cooling and super‑heating · Effect of condenser and evaporator pressure on COP · Multi‑pressure system: removal of flash gas, multiple expansion & compression with flash intercooling · Low temperature refrigeration: production of low temperatures, cascade system, dry ice, air liquefaction system
Unit 3 · Short notes Vapour Absorption, Steam‑Jet Refrigeration and Refrigerants Theoretical and practical vapour absorption systems such as aqua‑ammonia, Electrolux and other systems · Steam‑jet refrigeration: principles, simple cycle operation, description and working of simple system · Refrigerants – nomenclature & classification, desirable properties, common refrigerants, comparative study, leak detection methods · Environment‑friendly refrigerants and refrigerant mixtures, brine and its properties
Unit 4 · Short notes Psychrometrics Calculation of psychrometric properties of air by tables and charts · Psychrometric processes: sensible heating and cooling, evaporative cooling, cooling and dehumidification, heating and humidification, mixing of air streams, sensible heat factor · Principles of air conditioning, comfort requirements, ventilation standards, infiltrated air load, fresh air load, human comfort, effective temperature chart · Heat production and regulation of the human body
Unit 5 · Short notes Air Conditioning Calculation of summer & winter air‑conditioning load · Bypass factor of coil, calculation of supply air rate and its condition · Room sensible heat factor, gross sensible heat factor, effective sensible heat factor, dehumidified air quantity · Problems on cooling load calculation · Air distribution and ventilation systems

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