(3) RESULT AND DISCUSSION
Developed a tables of different parameters of four stroke four cylinder diesel engine and
drawn different types of characteristic curves like load Vs exhaust temperature, exhaust gas flow
rate, air fuel ratio ,brake power, indicated power , specific fuel consumption. When load of diesel
engine increases all these parameters are decreases. Other characteristic curves are load vs. engine
back pressure, engine efficiency, cooling capacity, heat input vs. cooling capacity, heat transfer at the
generator vs. cooling capacity. Back pressure increases when speed increase if surface area of
generator is less and back pressure reduce when surface area is more, engine efficiency increase as
well as increase automobile air conditioning has advantages of reducing the dedicated diesel engine,
refrigerant compressor, unit weight, capital cost, fuel cost, maintenance, atmospheric pollution and
noise pollution. One difficulty may occur when automobile is in very slow moving condition or it
rest. The eutectic plate, solar power, small electric heater is provided for heat exchanger or generator
of vapour absorption system.
The Lithium Bromide Water system and Aqua ammonia- Water system based as a
automobile air conditioner have following advantages and limitations.
(1) Generator or shell and tube heat exchanger designing is based on minimum back pressure and
maximum heat transfer capacity.
(2) Balance the fluctuation in cooling capacity of automobile cabin due to changing of speed,
traffic speed and cruse speed.
(3) Generator is made from stainless steel or galvanized steel due to reduce the corrosion
(4) The Lithium Bromide Water absorption refrigeration system have crystallization problem
and Aqua ammonia have toxic nature of ammonia keep in mind when designing absorption
automobile air conditioning system.
(5) Additional energy source is available for automobile air conditioner, when the vehicle in
parking i.e. eutectic plate, solar energy or electric heater.
(6) This air conditioning system is totally eco friendly in nature or used only natural refrigerants
as well as increases the mileage of automobile.