﻿ Dr. Sameer Khandekar

# ME340A: Introduction to Refrigeration and Air Conditioning

Welcome to ME340A

Rudolf Clausius: Heat can never pass from a colder to a warmer body without some other change, connected therewith, occurring at the same time

Lord Kelvin: It is impossible, by means of inanimate material agency, to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects.

Course File

 Lecture Date Download Topics covered Lecture #1 29.07.2019 Lecture Notes #1 Course outline, semester plan, grading policy, books, introduction to Refrigeration and HVAC systems, Industrial scope, Examples Lecture #2 01.08.2019 Lecture Notes #2 Basic thermodynamics, Units and conversion, Conservation laws, Temperature, Pressure, Enthalpy, Intrinsic and extrinsic properties Lecture #3 08.08.2019 - Steady flow processes, First law applied to Nozzles, diffusers, heat exchangers, turbines, compressors, Examples in RAC Lecture #4 09.08.2019 Lecture Notes #3 Basic elements of a vapor-compression refrigeration system, Phase-change processes, PVT representation, Thermodynamic property tables, Charts Holiday due to Id (12/08/19) and Independence day (15/08/2019) Lecture #5 16.08.2019 Lecture Notes #4 Phase-change processes, Representation, Refrigeration effect, COP, Refrigeration and Heat Pump operation Lecture #6 19.08.2019 Practice Problem Set #1 Supplementary Questions Carnot cycle, Ideal VCR cycle, Real;/Practical VCR cycle, Pressure drops, sub-cooling and superheating, Household refrigerator, Heat Pump System Lecture #7 22.08.2019 Lecture Notes #5 Modes of heat transfer, Conduction, Insulation, Heat Convection, Internal and external flows, Boundary layers Lecture #8 23.08.2019 - Assignment #1 Problem solving tutorial session Lecture #9 26.08.2019 - Estimation of transfer coefficients, Newtons law of cooling, Laminar and turbulent flows, Heat transfer coefficient Lecture #10 29.08.2019 - Phase-change heat transfer, Boiling/Condensation, Discussion on practical design considerations Lecture #11 30.08.2019 Quiz #1 conducted Lecture #12 02.09.2019 Lecture Notes #6 Type of heat exchangers, Overall heat transfer coefficient in heat exchangers,  fouling resistance, estimation of fouling, Examples: Scaling and rating problems Lecture #13 05.09.2019 Lecture Notes #7 Introduction to heat exchanger analysis, LMTD method, Arithmatic mean, Simple geometries and complex designs, Correction factor Lecture #14 06.09.2019 Lecture Notes #8 NTU - Effectiveness method, Derivation and characteristics Home Work #1 Given on 09.09.2019 To be submitted 14.10.2019 Lecture #15 09.09.2019 - Introduction to type of evaporators, Flooded tank, Shell and Tube, Beudelot, Finned tube systems, Defrosting, Type of condensers, Evaporative cooling systems Lecture #16 12.09.2019 Problems solving class: Overall heat transfer coefficient and LMTD methods Lecture #17 13.09.2019 Lecture Notes #9 Introduction to compressors (Part 1), types of compressors, reciprocating, centrifugal, scroll, construction and their operation END OF TERM #1: Mid Semester Exam on Wednesday, September 18, 2019 | L12 | 13:00 hrs Lecture #18 23.09.2019 Lecture Notes #10 Introduction to two-phase flows, flow boiling and flow condensation, different flow patterns, flow patterns maps, adiabatic/non-adiabatic systems Lecture #19 26.09.2019 - Various definitions, relation between mass fraction and void fraction, slip ratio; ways of flow acceleration, heating/cooling, flashing, phase- compressibility and area change Lecture #20 27.09.2019 Lecture Notes #11 Development of 1D basic homogeneous flow model, assumptions, two-phase frictional, acceleration and gravitational components, Lecture #21 30.09.2019 Lecture Notes #12 Refrigerants, types, thermodynamic properties, ASHRAE nomenclature, classification, new developments, Comparison of refrigerants Lecture #22 03.10.2019 Lecture Notes #13 Comparison between different refrigerants, Alternate refrigerants, replacement of phased out refrigerants, Environmental impact of refrigerants Lecture #23 04.10.2019 Lecture Notes #14 Compressor Analysis - Part 1: COP, EER, SEER rating, Ideal and real systems, Volumetric efficiency, Isentropic efficiency, actual cycles, Compressor oil, other sub-systems, Introduction to EES (Solver), Compressor performance simulation Mid Semester Break from 05.10.2019 to 13.10.2019 Lecture #24 14.10.2019 Lecture Notes #15 Overview of all R/HVAC systems installed in IIT Kanpur (Central AC, Microscope Building, Core Labs, Library, DX-Units, Water coolers, Chilled rooms, Animal House, Computer Centre etc. Lecture #25 17.10.2019 Lecture Notes #16 Compressor Analysis - Part 2: recent advances in compressor designs, performance data, modelling thermal performance of a compressor, design and selction Lecture #26 18.10.2019 FIELD VISIT Visit to the Central AC plant, Environmental science building, Air handling units, Maintenance Shop, Chillers, Cooling tower, etc. Lecture #27 21.10.2019 Lecture Notes #17 Introduction to Psychrometric processes, Saturation and thermodynamics, Vapor pressure, Relative humidity, WBT, DBT, Psychrometric Chart Lecture #28 24.10.2019 Lecture Notes #18 Air conditioning processes, Heating, Cooling, Humidification and Dehumidification, Isenthalpic saturation, Use of Psychrometric Chart, Human Comfort Lecture #29 25.10.2019 Problem solving exercise on the use of Psychrometric Chart Lecture #30 28.10.2019 Lecture Notes #19 Introduction to Radiation heat transfer fundamentals, black body radiation, emissivity, absorptivity, transmisivity, Color, Solar spectrum, Gray and diffused bodies, Radiation and building air conditioning Lecture #32 31.10.2019 Lecture Notes #20 Vapor Absorption Refrigeration System, thermal compression, NH3-water system, construction, Lecture #33 01.11.2019 COP of absorption systems, Comparison with VCR, Advantages and limitations Lecture #34 04.11.2019 Innovative Refrigeration Systems, Cascade, Multi-stage and Multi-purpose systems, Lecture #35 07.11.2019 Lecture Notes #21 Gas liquefaction, Linde-Hampson cycle, Joule-Thomson Coefficient, Gas refrigeration, Reverse Brayton cycle, COP, Lecture #36 08.11.2019 Solving problems on innovative refrigeration systems Lecture #37 14.11.2019 Quiz #2 was conducted during regular class hour

All rights reserved: Dr. Sameer Khandekar, Department of Mechanical Engineering, IIT Kanpur, Kanpur, 208016 India.