Tag Archive: AC/Refrigeration technology

An automobile AC consumes about one-tenth of the total fuel. This is a significant cost for the vehicle owners such as truck drivers who travel round the clock running. The innovation by Harish Tiwari addresses this challenge by designing an AC that may be able to run itself by using waste heat from the automobile exhaust. It may therefore make the running of an automobile more economical. It achieves this by using an adsorption refrigeration system powered by exhaust heat with only two control valves. A prototype of 1 kW cooling capacity has been designed and developed in the laboratory. The adsorbers use an innovative double pipe heat exchanger to enhance heat transfer and reduce the heating and cooling time. The system dimensions have been obtained and found to be suitable for Automobile and the system can operate in mobile applications. The overall weight of the system for a cooling capacity of 1 kW is around 30 kg. The heating time required to achieve the cooling effect is around 10 minutes. The number of valves is just two which gives reliability to the system and reduces the likelihood of leakage. The project requires support in fabricating a full-scale prototype. The project received Appreciation under the Gandhian young technology awards ‘More from less’ category from Dr. Mashelkar.

Harish Umashankar Tiwari, Pimpri Chinchwad College of Engineering, Pune University Prof. Dr. G.V. Parishwad, Government College of Engineering, Pune

Continuous electricity supply is still not available in large parts of the country. Still the people in these regions require refrigeration for a variety of socially relevant purposes such as cold storage or storing medical supplies. This project has the novelty of using LPG instead of electricity for refrigeration. This solution is convenient for refrigeration in regions without proper electricity.
It works on the principle that during the conversion of LPG into gaseous form, expansion of LPG takes place. Due to this expansion there is a pressure drop and increase in volume of LPG that results in the drop of temperature and a cooling effect. This cooling effect can be used for refrigeration purposes.
The technology can provide refrigeration for socially relevant needs in areas where continuous electricity supply is absent. It can also replace refrigerators currently using CFCs and HFCs, which are causing global warming.
The Gandhian awards received prototypes from two teams based on this concept.

Team 1:
The team from Laljibhai Chaturbhai Institute of Technology made a prototype in which the evaporator temperature reached -5 ºC at an ambient temperature of 12 ºC.
Chintan Patel, Mayank D Patel, Mayank I Patel and Biren Patel,
Laljibhai Chaturbhai Institute of Technology, Mehsana, Gujarat Technological University
Project Guides: Prof YL Raol, Prof AB Patel

Team 2:

ITR utilised this principle to develop a heat exchanger comprising network of pipes through which LPG gas can pass, covered by thin and closely spaced fins. The addition of fins help in effective and faster cooling. The insulating material helps in storing the cooling effect for a longer period of time.
Jainil Bhatt, Dhruvin Kagdi, Tirth Jani, Kunjal Jadav,
LDRP-­ITR College
Project Guide: Prof. Tushar Patel