Advanced Refrigeration Systems

By Prof. Jahar Sarkar | IIT BHU Varanasi

Learners enrolled: 386 | Exam registration: 4

ABOUT THE COURSE:

The main aim of this course is to discuss the various advancements or modifications of conventionalvapor compression systems and alternative refrigeration systems with future perspectives. This course contains energy and exergy analyses of vapor compression refrigeration cycles and their conventional and advanced modifications to improve the performance. This course also discusses the refrigerants in view of their performance, safety and environmental issues. This course also contains two important alternative refrigeration systems: ejector refrigeration (heat-driven system) and thermoelectric refrigeration (solid-state system). This course will not only educate on the different aspects of refrigeration but also give an overview of recent R&D trends in refrigeration.

INTENDED AUDIENCE: Students from Mechanical Engineering and Food Technology

PREREQUISITES: Thermodynamic and Heat transfer

Summary

Course Status :	Upcoming
Course Type :	Elective
Language for course content :	English
Duration :	12 weeks
Category :	Mechanical Engineering Energy Systems
Credit Points :	3
Level :	Postgraduate
Start Date :	19 Jan 2026
End Date :	10 Apr 2026
Enrollment Ends :	26 Jan 2026
Exam Registration Ends :	13 Feb 2026
Exam Date :	24 Apr 2026 IST
NCrF Level	4.5 — 8.0

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1:

Refrigeration cycle (thermodynamic view), Simple vapor compression cycle, Energy and exergy analyses, Ewing’s construction

Week 2:

Transcritical refrigeration cycle, Modified cycles with internal heat exchanger, turbine and flash gas bypass

Week 3:

Modified cycles with multi-stage compression and multi-evaporators

Week 4:

Cascade refrigeration system, Refrigeration system with parallel compression economization

Week 5:

Refrigeration system with mechanical subcooling, Vortex tube enhanced refrigeration system

Week 6:

Refrigerants (thermodynamics, physical, chemical and environmental aspects)

Week 7:

System components (evaporator and condenser)

Week 8:

System components (compressor and expansion device)

Week 9:

Other system components, System simulation, design, measurement and control aspects

Week 10:

Steam ejector refrigeration cycle, Modified ejector refrigeration cycle

Week 11:

Two-phase ejectors, Ejector-enhanced vapor compression refrigeration cycle

Week 12:
Thermo-electric refrigeration systems

Books and references

1. Refrigeration and Air-conditioning by C P Arora

2. Refrigeration and Air-conditioning by R C Arora

3. Refrigeration Systems and Applications by I. Dincer

Instructor bio

Prof. Jahar Sarkar

IIT BHU Varanasi

Dr. Jahar Sarkar is Professor of Mechanical Engineering at Indian Institute of Technology (BHU), Varanasi. He received B.E. (IIEST, Shibpur), MTech and PhD (IIT Karagpur) in Mechanical Engineering. He has 20 years of teaching and research experience. His field of interest includes Thermodynamic, Heat Transfer, Refrigeration, Air-conditioning, Heat Pump and Renewable Energy. He has significant research contributions in Thermal Sciences with excellent publication and citation records.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.

The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).

Date and Time of Exams: April 24, 2026 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.

Registration url: Announcements will be made when the registration form is open for registrations.

The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.

Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

Please note that assignments encompass all types (including quizzes, programming tasks, and essay submissions) available in the specific week.

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT BHU Varanasi. It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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