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Vehicle engine almost get the energy by heat of combustion. The heat of combustion is consummed to generating work and thermal loss. It is good for efficiency to reduce thermal loss, but it has a limit because of engine durability. So, we must use a cooling system to lower engine temperature. There are two types of cooling system which are Water cooled system and air cooled system. Recently, vehicle engine uses a water cooled system. And most of water cooled system uses a radiator and a fan. The fan has two types generally. One is a viscous fan. This fan is connected with fluid clutch directly. And the fluid clutch is linked to engine by belt. If engine operates, the fan always turn round. But it is not matching engine speed, because of slip between engine and fan by fluid clutch. Anyway, in a viscous fan, there are always fuel consumption of fan during operating an engine. The other is an Electric fan. This fan is connected at electronic motor which electronically operates. So, It does not work when engine temperature is low. This means that fuel consumption of fan is zero. Moreover, a viscous fan is bad for warm-up because a fan always operates. And engine temperature of a viscous fan is lower than that of electronic fan when temperature is stabilized. Because the low temperature increases engine friction, a viscous fan is bad for fuel economy. This paper discusses about the effect of fuel economy according to viscous fan and electronic fan. The results show that a difference of vehicle fuel economy according to a fan is 2.4% in FTP-75 mode. It is important to choice of a fan to be a efficient car.

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Abstract
1. 서론
2. 연비 분석 방법론
3. 실험방법 및 장치
4. 결론
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