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2L급 디젤 차량에서 냉각팬 종류에 따른 차량 연비효과
이용규(Yonggyu Lee),홍영택(Youngtaek Hong),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
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.
최종민(Jongmin Choi),김귀택(Gwitaek Kim),김선진(Sunjin Kim),정융(Yoong Jung),김민수(Min Soo Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, semi lumped parameter thermal modelling is developed for transient analysis of 4 kW TEFC(totally enclosed fan cooled) induction motor. In order to validate the method, the previous experimental and analytic results using lumped parameter thermal modelling is adopted from Amar Bousbaine (1993). Various heat transfer coefficient correlations are chosen for this modelling, which are from literatures and widely applied for heat transfer analysis accompanying with the laminar or turbulent flow around electric motors. The results show comparatively similar tendency except for stator and end cap air region, which are limited in calculation due to complicated heat transfer mechanism nearby and intrinsic simplicity of semi lumped parameter thermal modelling.