ME 684: Air Conditioning System Design


The course is a so-called advanced course of Refrigeration and Air conditioning system (RAC) and Thermal Environment Engineering (TEE) usually offered in spring semester. It builds upon the last topic taught in RAC i.e. psychrometry and goes up-to the applied air-conditionings catering to real life cooling demand of industries and buildings. In short, RAC and TEE covers theoretical part of AC system whereas this course covers practical aspects it.

Since, the course is purely applications based, you will not find yourself dealing with derivation kind of stuff rather you will learn the skill of using them practically as required. The course revolves around 3-4 major topics and doesn’t not have a large exhaustive topic list to be learned. Thus, the course expects you to systematically learn and apply major concepts of AC design and once you are through it, it will be a cake walk provided you devote time to practice some problems


The major take away of the course (provided studied properly) are as follows:

  1. You will be able to estimate the cooling load for a building (Yes you can calculate how much tonnage of air-conditioner is required for your house too :p)
  2. Designing of the cooling tower; height required etc.
  3. Calculation of area of heat exchanger required for evaporator and condenser of the AC for a particular cooling load
  4. Design of central cooling systems (like in malls etc.): Ducts sizing, pressure drop, kind of fan/blower required etc.

To summarize, the content is designed such that you will be able to directly apply its principles in an air conditioning industry

Course Content:

  1. Introduction to Psychrometric Processes
  2. Comfort Conditioning (ASHRAE Standards)
  3. Solar Geometry & Heat gain through walls and windows
  4. Cooling Tower Design
  5. Heating and Cooling Coil Design
  6. Fans & Duct Design


Quizzes (2) – 20%

Midsem – 30%

Endsem – 50%

The exams are numerical in nature and exactly based on the concepts and examples given in references.

In the year academic year 2015-16 spring semester 40 students took the course
(Prof. S.L. Bapat) of which 7(17.5%) got AB or above and 10(25%) got FR. The stats of the previous academic year (Prof. Rane Milind) are much better with 50% getting 9 and above and only 3(8%) people getting an FR.


  1. Thermal Environment Engineering by Threlkeld (Please note that it has only few copies in library and it is not available in India for purchasing (Importing is very costly): Rest all parts of the course
  2. Refrigeration and Air Conditioning by C P Arora: Solar Radiation Part
  3. (Maybe of some minor help)

Experts’ Advice:

Disclaimer: Valid only if taken by Prof. S. L. Bapat

The teaching will be done using presentations which will not be provided to the students. Please make regular notes in class or have someone who can provide it (second option not recommended at all: making notes in class will reflect in your grade as you will be familiar to content). The student needs to be self-motivated to learn and solve problems from books provided in reference section as class notes will not be provided to students. You don’t have to solve lot of problems. Just solving one detailed example about each topic from books provided will suffice for a good grade.