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] in figure 1 The coolant cycle 1 of the heat pump is schematically shown in, and the coolant cycle has a two-stage compressor 2 including a first compression stage 3 and a second compression stage 4. 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 clarity.
[0031] By means of the compression stages 3, 4 of the two-stage compressor 2, the pressure level of the coolant is first increased from the first pressure level to the medium average level and then to the high pressure level. Here, as the coolant, a liquid fluid under overpressure is used, and the fluid is gaseous after depressurizing and absorbing heat. The coolant is, for example, in a gaseous state and is fed to the first compression stage 3 of the compressor 2 at a low pressure, where an intermediate pressure level is established, wherein the coolant is heated at the same time.
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