Control method of circulating pump-free type steam pressurized ejector refrigeration system
A technology of a refrigeration system and a control method, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., and can solve problems such as inconvenient system instability, rising, liquid circulation pump failure maintenance, etc.
Inactive Publication Date: 2015-05-27
ZHEJIANG UNIV
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Problems solved by technology
At the same time, the problem of easy failure and inconvenient maintenance of the liquid circulation pump makes the system unstable
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Embodiment 1～15
[0105] by figure 2 The system shown is taken as an example, with R134a as the refrigerant, the cooling capacity Q is 2KW, the evaporation temperature is 10°C, the condensation temperature is 30°C, and the volume of the liquid storage tank is 0.013m 3 . The density of saturated liquid and saturated gas of R134a varies with temperature as image 3 shown.
[0106] According to formula (33), when the refrigerant type and condensation temperature are determined, the optimal initial boost ratio is only determined by the occurrence temperature. Examples 1-15 in Table 2 give the values of the corresponding optimal initial boosting ratios at the occurrence temperature of 80-94°C.
[0107] Through software (see A.Khalil, M.Fatouh, E.Elgendy, Ejector design and theoretical study of R134a ejector refrigeration cycle. International journal of refrigeration 2011; 34:1684–1698) to simulate the ejector refrigeration with R134a as refrigerant Table 2 shows the value of the ejection rati...
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The invention discloses a control method of a circulating pump-free type steam pressurized ejector refrigeration system. The initial condensate hydraulic pressure ratio is controlled in a liquid-storage tank to obtain the optimal initial pressure ratio, so that the COP (Coefficient of Performance) of system performance is maximal, and the amount of cooling water in the liquid-storage tank in the cooling sub-process is minimal. The optimal initial pressure ratio is only determined by the refrigerant type, the temperature, and the condensing temperature; and the optimal initial pressure ratio can be obtained by adjusting the volume of the liquid-storage tank and the time of the refrigeration stage. For the actual system, the refrigerant type, the temperature, the evaporating temperature, the condensing temperature, the refrigerating capacity and the volume of the liquid-storage tank are determined, so that when the optimal initial pressure ratio is obtained, the time of the refrigeration stage is uniquely determined. Only the refrigeration stage time needs to be controlled accordingly, the system operation can be under the optimal initial pressure ratio state, so that the COP can be optimized, and the cooling water consumption is minimal. The control method of the circulating pump-free type steam pressurized ejector refrigeration system has the advantages of being simple in the realization method, obvious in the effect, and beneficial for the deep understanding and promotion of the pressurized ejector refrigeration system.
Description
technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a control method of a non-circulation pump type steam pressurization injection refrigeration system. Background technique [0002] Ejectors are able to boost the pressure of low pressure fluid with high pressure fluid. Ejector refrigeration systems utilize ejectors to replace mechanical compressors in traditional refrigeration systems such as figure 1 As shown, 1 is a generator, 2 is an evaporator, 3 is a condenser, 4 is an ejector, 5 is a liquid pump, and 6 is a throttle valve. The ejection refrigeration system is driven by low-grade heat energy, which is conducive to reducing energy and environmental pressure. [0003] A part of the liquid coming out of the condenser 3 is used for refrigeration, and another part of the liquid makes up for the liquid reduced by the high temperature and high pressure generated by the generator 1 . But before the condensate en...
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IPC IPC(8): F25B49/00
CPCF25B49/00F25B2600/00
Inventor 何一坚张胜李荣王祎陈光明唐黎明
Owner ZHEJIANG UNIV