The cooling agents customarily employed are air and a liquid (usually or a solution of water and ), either alone or in combination. In some cases, direct contact with ambient air (free ) may be sufficient; in other cases, it may be necessary to employ forced-air convection, created either by a fan or by the natural motion of the hot body. Liquid is typically moved through a continuous loop in the cooling system by a .
, apparatus employed to keep the temperature of a structure or device from exceeding limits imposed by needs of safety and efficiency. If overheated, the oil in a mechanical loses its lubricating capacity, while the fluid in a hydraulic coupling or converter leaks under the pressure created. In an , overheating causes deterioration of the insulation. The pistons in an overheated may seize (stick) in the cylinders. Cooling systems are employed in automobiles, industrial plant machinery, nuclear reactors, and many other types of machinery. (For a treatment of cooling systems used in buildings, see .)
In an , the motion of the vehicle provides sufficient forced-convection cooling for the transmission and the gears in the rear axle; in the , however, so much energy is released that, except for some early models and certain small cars with low-powered engines, air cooling is inadequate, and a water cooling system (radiator) is required.
A typical automotive cooling system comprises (1) a series of channels cast into the engine block and cylinder head, surrounding the combustion chambers with circulating liquid to carry away heat; (2) a , consisting of many small tubes equipped with a honeycomb of fins to convect heat rapidly, that receives and cools hot liquid from the engine; (3) a water pump, usually of the centrifugal type, to circulate the liquid through the system; (4) a thermostat to control temperature by varying the amount of liquid going to the radiator; and (5) a fan to draw fresh air through the radiator.
|Noun||1.||cooling system - equipment in a motor vehicle that cools the engine|
engine cooling system
equipment - an instrumentality needed for an undertaking or to perform a service
fan - a device for creating a current of air by movement of a surface or surfaces
fan belt - a belt driven by the crankshaft that drives a fan that pulls air through the radiator
automotive vehicle, motor vehicle - a self-propelled wheeled vehicle that does not run on rails
pump - a mechanical device that moves fluid or gas by pressure or suction
radiator - a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan
radiator hose - a flexible hose between the radiator and the engine block
thermoregulator, thermostat - a regulator for automatically regulating temperature by starting or stopping the supply of heat
|2.||cooling system - a mechanism for keeping something cool; "the cooling was overhead fans"|
air conditioner, air conditioning - a system that keeps air cool and dry
coolant system - a cooling system that uses a fluid to transfer heat from one place to another
cooling tower - a cooling system used in industry to cool hot water (by partial evaporation) before reusing it as a coolant
evaporative cooler - a cooling system that cools by evaporation
mechanism - device consisting of a piece of machinery; has moving parts that perform some function
refrigeration system - a cooling system for chilling or freezing (usually for preservative purposes)
water pump - the pump in the cooling system of an automobile that cause the water to circulate