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    AUTOMOBILE A/C BY UTILISING WASTE HEAT & GASES AKA ENVIRONMENTAL FRIENDLY REFRIGERATION & AIR CONDITIONING SYSTEM PROJECT REPORT | We, Mechanical farm, provide the widest list of mechanical engineering final year project and Automobile Engineering project topics and reports. Also, we have a great variety of pre-made Solar project kits using solar panels, batteries, Inverter, LEDs for you to use in your projects.


    It is an established fact that only about 30% of heat supplied by the fuel is converted into useful work, in case of internal combustion (I.C) engines and the rest is going waste to the atmosphere in the form of coolant losses (35%) and exhaust gas losses (35%). The conventional air conditioning system which most of the A/C vehicles use is the Vapour Compression Refrigeration System, in which the compressor needs mechanical work (i.e) Higher-grade energy is then taken directly from the engine crankshaft. Thus it ultimately reduces the brake power (B.P.) available and increasing brake specific fuel consumption. 

    The vapour absorption refrigeration system utilizes the waste heat as it does not involve any compressor and hence not require great mechanical work instead of that it works directly on the heat energy  (i.e) low grade energy.

    Thus by making proper use of lost heat (about 60–70% of total heat). The conventional air conditioning can be replaced with this system and the same effect can be experienced. The common vapour absorption refrigeration systems, which are in practice, are

    1. Aqua Ammonia system
    2. Lithium Bromide water system


    1. No moving parts so, quiet in operation, subjected to little wear, low maintenance cost. The pump required quite small power in comparison with compressor.
    2. Large capacity.
    3. Excellent part load efficiency and almost constant c.o.p. of the system over a wide range of load.
    4. Automatic capacity control is easy.
    5. Smaller space per unit capacity.
    6. No harm to the ozone layer.
    7. Inexpensive refrigerant.
    8. Leakage can be easily detected in case of aqua-ammonia system.
    9. It can reduce the rate of global warming of atmosphere.     


    Thus we have seen that the VARS is efficient in every respect, and can be successfully implemented with better designs and sophistication. Now it is the task of the up-coming engineers to overcome the hurdles in the way if any and make our country’s people enjoy the comfort and luxury of A/C and fuel will also be saved to a greater extent which would have been consumed in excess by the (VCRS) air conditioner. And also, the environment is kept healthy and pollution-free.


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