The present work investigates the effect of high ambient temperature on the specific fuel consumption. When tested at low speed and low load, it was shown that the engine performance, the fuel consumption and the engine pollution were significantly affected. Urban cycle testwas used to measure the performance and consumption, which was adopted to suit these circumstances in Kuwait where the temperature reachesalmost 55 o C in summer (in the shadow) especially in July and August. The current study reveals clearly the effect of ambient temperature on the performance criteria.
This study investigates the effect of using A/C refrigerant to reduce the temperature of the coolant in a vehicle cooling system. An increase in coolant temperature due to harsh working conditions increases fuel consumption and leads to a reduction in engine power. Modifying vehicle air-conditioning by passing the suction line of the A/C system through the heat exchanger located in the lower part of the radiator (down flow type) can significantly improve the performance of the engine cooling system. The results show a reduction in the temperature of coolant within the cooling system, thus maintaining a controlled working temperature within the allowable limits.
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