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A/C system. A/C系统
Two points that are critical to the understanding of the A/C system are the route through which the refrigerant flows and the differing states the refrigerant is in as it travels around the circuit. A great starting point for the understanding of this is at the compressor.
有两点对于理了解解A/C系统的运行非常关键，即制冷剂流动的线路和制冷剂在环路中循环时的不同状态。了解这些的一个很好的最好切入点就是压缩机。
Commonly, A/C compressors contain reciprocating pistons. As the piston travels in one direction, through a one way valve, it draws in the refrigerant gas from the low pressure side of the circuit. The piston then travels back in the other direction and compresses the refrigerant gas causing a large increase in pressure. Once the pressure reaches a specific threshold it will overcome a second one way valve and allow the now high pressure refrigerant gas to exit the compressor and into the high pressure side of the refrigerant circuit. There is a relationship between pressure and temperature. When the pressure of a substance is increased its temperature will also increase.
通常A/C压缩机都包含一些往复式活塞压缩机都有一些往复式活塞。活塞向一个方向移动时，环路中低压端的气态制冷剂通过一个单向阀，循环中低压端的气态制冷剂被吸入进来。活塞然后向反方向移动，压缩气态制冷剂，引起压强急剧升高。一旦压强达到临界点，它将迫使第二个单向阀打开，此时高气压中的气态制冷剂从压缩机中被释放出来，进入制冷循环的高压端进入制冷环路的高压端。这里就存在着一个压强与温度的关系，当物体所受的压强升高，它的温度将随之升高。
The pressure increases substantially as the refrigerant travels through the compressor. The low pressure side of the circuit would typically be under the pressure of 2 bar; the high pressure would typically be under the pressure of 15 bar. A rise of 13 bar! This large increase in pressure also results in a large increase in temperature. The temperature of the refrigerant entering the compressor would be 10-20°C and the temperature of the refrigerant exiting the compressor would be in the region of 90°C!
制冷剂通过压缩机时，压强急剧升高。循环环路中的低压端正常压强为2巴，高压端的正常压强为15巴。一下增加了13巴！这一压强的剧增同样引起了温度的骤升这一压强的剧增同样引起了温度的大幅上升。制冷剂进入压缩机时温度大概为10-20°C，离开时温度则会变为90°C左右！
This high pressure high temperature gas then travels onwards to the condenser – a large heat exchanger usually located in front of the engine radiator. If two substances of differing temperatures are placed together, heat will travel from the hotter substance to the cooler substance until both substances reach an equal temperature.
这一高压高温气体接着向冷凝器转移。冷凝器是一个大的换热器，通常位于引擎散热器的前端。如果不同温度的两种物质被放置在一起，热量将会从较热的物体向较冷的物体转移，直到两者温度相等相当。
As the term heat exchanger suggests, heat is exchanged from the hotter body to the cooler body. In this case the hotter body is the refrigerant gas and the cooler body comprises the fins of the condenser. As the heat is transferred to the fins of the condenser, cooling air flows over them. Again a heat exchange process occurs allowing the heat from the fins to transfer into the cooler air travelling past them into, usually, the engine compartment. 
正如换热器其名，热量从较热物体转移交换到较冷物体上。这一情况中，较热物体是气态制冷剂，较冷物体包括冷凝器的那些散热片。当热量被转移到散热片上时，冷空气从上层经过。这样，又一次热交换过程发生，散热片上的热量转移至上空经过的冷空气中，这些冷空气通常是去往引擎室的。
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