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Industrial air conditioning Content
1. Psychometric
Define psychometric and the composition of moist air, Discuss the methods used for estimating properties of moist air ,Present perfect gas law model for moist air ,Define important psychometric properties, Present graphical representation of psychometric properties on a psychometrics chart ,Discuss measurement of psychrometric properties ,Discuss straight-line law as applied to air-water mixtures ,Discuss the concept of adiabatic saturation and thermodynamic wet bulb temperature ,Describe a wet-bulb thermometer ,Discuss the procedure for calculating psychrometric properties from measured values of barometric pressure, dry bulb and wet bulb temperatures ,Describe a psychrometer and the precautions to be taken while using psychrometers
2. Psychrometric Processes
Introduction to psychrometric processes and their representation ,Important psychrometric processes namely, sensible cooling and heating, cooling and dehumidification, cooling and humidification, heating and humidification, chemical dehumidification and mixing of air streams ,Representation of the above processes on psychrometric chart and equations for heat and mass transfer rates ,Concept of Sensible Heat Factor, By-pass Factor and apparatus dew point temperature of cooling coils ,Principle of air washers and various psychrometric processes that can be performed using air washers ,Concept of enthalpy potential and its use
3. Inside And Outside Design Conditions
Describe a typical air conditioning system and discuss the need for fixing
suitable indoor and outdoor design conditions ,Discuss the criteria used for selecting inside design conditions , Define thermal comfort, metabolic rate and response of human beings to variation in body temperature, Present heat balance equation, equations for convective, radiative and evaporative losses from the skin, metabolic rates for various types of activities and discuss the thermo-regulatory mechanism used by human body to fight against heat and cold , Discuss the factors affecting thermal comfort ,Discuss the various thermal indices used for evaluating indoor environment and present ASHRAE comfort chart, recommended inside design conditions and discuss the concept of Predicted Mean Vote (PMV) and Percent of People Dissatisfied (PPD),Discuss the criteria used for selecting outside design conditions and present typical summer design conditions for major Indian cities as suggested by ASHRAE
4. Psychrometry of Air Conditioning Systems
Purpose of psychrometric calculations, Analysis of a simple, summer air conditioning system with 100% re-circulated air, Analysis of a summer air conditioning system with outdoor air for ventilation and, with zero by-pass factor Analysis of a simple, summer air conditioning system with outdoor air for ventilation and with non-zero by-pass, Analysis of a summer air conditioning system with re-heat for high latent cooling load applications, Selection guidelines for supply air conditions
5. Evaporative, Winter And All Year Air Conditioning Systems
Introduce evaporative cooling systems , Classify evaporative cooling systems ,Discuss the characteristics of direct evaporative cooling systems ,Discuss the characteristics of indirect evaporative cooling systems ,Discuss the characteristics of multi-stage evaporative cooling systems, Discuss advantages and disadvantages of evaporative cooling systems, Discuss the applicability of evaporative cooling systems ,Describe winter air conditioning systems ,Describe all year air conditioning systems
6. Cooling And Heating Load Calculations
Introduction to cooling and heating load calculations , Solar radiation, solar constant and solar irradiation ,Solar geometry, latitude, declination, hour angles, local solar time and total sunshine hours ,Derived solar angles ,Angle of incidence for horizontal, vertical and tilted surfaces ,Calculation of direct, diffuse and reflected radiation using ASHRAE solar radiation model, Effect of clouds