2014/5/8 7,3 Radiator散热量】 e -10 24 716 1.03 32.8 67.2 L.028 3.5 61.5 1.0506 L.0586 1.0827 54.7 45.3 1.0713 -50 59.9 0.1 1.0780 1型 同将大汽卓国 窗凡冷大司 风情★原酒 窗凡冷复 培大鲜汽率■ 重时W、项W Radiator cap到散热推 Working process of radiator cap 同骨大代厚甲用 得情大章汽甲滑 大代用 Reserve tank补德水塘 shte通叶直 T.4 Radiator Fan冷却风德) For the aual Dew faa'satrw ,山 The radatar fan eas每由hn的 aErive hekegr an slertrie isstec 界4 物月冷右餐 同将大汽摩恒 复日冷木置 n/ 降修大示究率植 @R冷大司 阳密大究率■ 22014/5/8 2 10/27 同济大学汽车学院 The mixture of ethylene glycol(乙二醇) and water is widely used. Freezing temperature /℃ ethylene glycol （％volume） water （％volume） density g/cm3 -10 -15 -20 -25 -30 -40 -50 28.4 32.8 38.5 45.3 47.8 54.7 59.9 71.6 67.2 61.5 54.7 52.2 45.3 40.1 1.043 1.0426 1.0506 1.0586 1.0627 1.0713 1.0780 11/27 同济大学汽车学院 There are different kinds of antifreeze, which are most easily identified by their color. “The green stuff” is traditional coolant, which can be used in most cars. It contains lubricating silicates(润滑硅酸盐) and corrosion inhibitors(缓 蚀剂), but these silicates deteriorate(恶化) rather quickly, requiring coolant changes every two years/24,000 miles. Coolant can also be red, yellow, orange, or even purple. These coolants are pretty much the same; they are simply dyed（染色） different colors. They have a longer claimed service life, thus requiring fewer fluid changes-in some cases up to 100,000 miles. 12/27 同济大学汽车学院 7.3 Radiator (散热器) The radiator is a heat exchanger with hundreds of individual tubes and fins(散 热片) that reduce the temperature of the coolant. As coolant travels through the water jacket（水套） it absorbs and removes heat from the engine and transports it to the radiator. Air flows through the coolant passages as the car moves, cooling the tubes and fins and coolant reenters the engine with a reduced temperature. 13/27 同济大学汽车学院 Radiator Core (散热器芯) 散热器材料：黄铜、铝或复合材料 Radiator is made of brass, aluminum or composite materials. fin and tube core ribbon-tubular core Plate core coolant 14/27 同济大学汽车学院 Radiator cap(散热器盖) The radiator cap is a pressure-release valve. It keeps the cooling system under pressure which is higher than ambient pressure in order to increase the boiling point of coolant. Steam valve 蒸汽阀 Air valve 空气阀 Steam valve spring 蒸汽阀弹簧 Air valve spring 空气阀弹簧 Cap (盖) 15/27 同济大学汽车学院 Working process of radiator cap Air valve open Air valve Steam valve open Steam valve 16/27 同济大学汽车学院 Reserve tank(补偿水箱) 其作用就是当冷却液受热膨胀时，部分冷却液流入补偿水桶；而当冷却液降 温时，部分冷却液又被吸回散热器，冷却液不会溢失。 Radiator 散热器 Reserve tank 补偿水箱 When the cooling liquid expands when heated , part of the coolant flows into the reserve tank; when the cooling liquid is cooling , the part of the coolant is sucked back into the radiator. As a result , the coolant won’t overflow from radiator and it keeps the radiator full of coolant. 17/27 同济大学汽车学院 功用：通过调节流经散热器的空气量来调节冷却系的冷却强度。 Shutter(百叶窗) Shutter To control the opening state of shutter, we can regulate the mass of air flowing to the radiator. So the degree of cooling can be controlled. 18/27 同济大学汽车学院 7.4 Radiator Fan (冷却风扇) The fan is used for increasing the velocity and mass of air flowing to the radiator. It is mounted(安装) behind the radiator. Category: Axial flow fan(轴流式) Centrifugal fan(离心式) For the axial flow fan’s structure is simple and it has high efficiency, so it’s widely used on automotive. The radiator fan can be driven by a drive belt or an electric motor. Axial flow fan(轴流式)