Method and device for cooling an engine
A motor and equipment technology, applied in the field of equipment for implementing the method, can solve the problems of time-consuming, system efficiency reduction, etc.
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[0030] exist figure 1 A coolant circuit 1 of a heat pump with a two-stage compressor 2 comprising a first compression stage 3 and a second compression stage 4 is schematically shown in FIG. The two-stage compressor 2 is driven by a motor 5 , wherein the mechanical connection between the motor 5 and the compression stages 3 , 4 of the two-stage compressor 2 is not shown for the sake of clarity.
[0031] With the aid of the compression stages 3 , 4 of the two-stage compressor 2 , the pressure level of the coolant is first increased from a first pressure level to a medium average level and then to a high pressure level. In this case, a liquid fluid under excess pressure is used as coolant, which fluid is gaseous after depressurization and absorption of heat. The coolant is, for example, gaseous and is fed at low pressure to the first compression stage 3 of the compressor 2 and builds up there at an intermediate pressure level, wherein the coolant is heated at the same time.
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