Under a given operating condition, to adjust the cooling capacity of the system, it is necessary to change or. For refrigeration systems with fixed speed and fixed volume compressors, if the influence of the gas transmission coefficient is neglected, the actual gas delivery volume of the compressor is determined only by the structural parameters and rotational speed of the compressor, and the type and working conditions of the refrigerant. It has nothing to do with it and cannot be changed. For pure working fluids, there is nothing to do with changing the working fluid; however, for mixed working fluids composed of two or more boiling points of different pure qualities, the change is achievable. In general, a working fluid with a high boiling point has a low cooling capacity per unit volume, while a working fluid with a low boiling point has a high cooling capacity per unit volume; when the two are combined in different ratios, the mixed working fluid The unit volume cooling capacity can be varied within a wide range to achieve the purpose of compressor capacity adjustment. According to the gas-liquid equilibrium theory of the mixture, there are some differences between the two components in the gas phase and the liquid phase under the same pressure and saturation state. The percentage of the low-boiling component in the gas phase is greater than that in the liquid phase. The percentage in the high boiling component is lower in the gas phase than in the liquid phase. Therefore, it is possible to select non-azeotropic mixed working fluids with similar thermodynamic properties and suitable components to form a large difference in temperature at the bubble point, and then separate and recombine the mixture by a specific device, thereby achieving a purposeful change of system circulation. The compositional concentration of the mass reaches the purpose of adjusting the system load. The development status of the variable concentration capacity adjustment device is roughly divided according to the position of the variable capacity device in the system, and the above-mentioned device is improved by You Ying et al. The main purpose is to change the external heating source in the two liquid storage tanks to use high-pressure superheated gas to make the device more energy-saving. However, by using the effect of gas-liquid separation in the liquid storage tank to change the concentration of the system, the effect will be insignificant, and the magnitude of the concentration change is limited by the size of the liquid storage tank and the amount of the solution in the liquid storage tank, and it is difficult to achieve the desired capacity adjustment. effect. Therefore, he proposed that the two devices are only ideas and have not been implemented. The component separation system is installed between the indoor unit and the throttle valve. Since the component separation system is disposed on the high pressure side of the system, it is not necessary to perform special insulation. The liquid storage tank in the separation system stores the volatile components separated by the rectification column, and solves the oil return problem of the system. In order to avoid excessively high compressor exhaust temperature when the volatile components in the system increase, a throttling valve is installed between the condenser outlet and the compressor inlet. The experiment proves that the compressor discharge temperature can be effectively prevented. The main characteristic of such a device between the condenser and the evaporator is that the change of the working condition is used to change the opening degree of the expansion valve, so that the circulation flow rate of the system changes, thereby achieving the purpose of changing the components of the system. position. The variable concentration device is mainly similar to the one in the condenser between the condenser and the compressor. The composition ratio of the mixed working fluid is changed by the change of the system flow rate of the mixed working fluid variable concentration capacity adjusting device. The only difference is that the two capillaries connecting the variable concentration system to the refrigeration system are not on either side of the expansion valve, but between the condenser outlet and the compressor suction port. The main characteristic of such a variable concentration device between the evaporator and the compressor is that the outlet of the evaporator has a liquid working fluid outflow, and then the composition of the mixed working medium is changed by some variable concentration device to change the compressor. Inhalation specific volume, to achieve the purpose of system capacity change. Variable concentration device position. Conclusions and Prospects According to the placement position of the variable concentration device in the system, several types of variable concentration capacity adjustment devices existing in the literature are summarized and the following conclusions are drawn: 1) The types of variable concentration capacity adjustment devices mainly have storage. The liquid tank, gas-liquid separator and rectification column are different from the separation effect of the high and low components of the mixed working fluid, and the effect of separating and changing the concentration by the rectifying column is better than that of the liquid storage tank and the gas-liquid separator. 2) In order for the variable concentration adjusting device to function, it is necessary to have a mixed working medium mainly composed of liquid or liquid to flow into the variable concentration adjusting device. Therefore, the inlet end of the variable concentration device must be placed in a place where the liquid working medium flows out (eg At the condenser outlet or at the evaporator inlet, the actual effect of changing the composition is better than at a location where there is no liquid working fluid or liquid working medium (eg compressor outlet or evaporator outlet). Aluminum cooling plate widely use in the heat exchange industry. 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