Variable-concentration directly-heated type heat pump water heater with flash evaporators and working method thereof
A technology of heat pump water heaters and flash evaporators, which is applied in the field of variable concentration direct heat pump water heaters, and can solve problems such as difficulty in large-scale promotion, large pressure ratios, and attenuation of energy efficiency in heating systems
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Embodiment 1
[0040] Embodiment 1: as figure 1 As shown, a variable concentration direct heating heat pump water heater with a flash evaporator includes a main circulation loop, an air supply branch and a concentration adjustment branch. The main circulation loop includes a compressor 1, and the exhaust port 1b of the compressor 1 It is connected with the inlet 2a of the condenser 2, and the outlet 2b of the condenser 2 is connected with the inlet 3a of the high-pressure accumulator 3, and the outlet 3b of the high-pressure accumulator 3 is respectively connected with the inlet 4a of the subcooler 4 and the supplementary expansion of the working medium The inlet 12a of the valve 12 is connected, the outlet 4b of the subcooler 4 is connected with the inlet 5a of the first expansion valve 5 and the inlet 11a of the third stop valve 11 respectively, and the outlet 5b of the first expansion valve 5 is connected with the outlet of the flash evaporator 6 The inlet 6a is connected, the exhaust por...
Embodiment 2
[0048]Example 2: A working method of a variable concentration direct heating air source heat pump water heater. The control method adopted by the system can be suction pressure control valve, compressor power consumption control valve, working fluid level control method, superheat control valve Or its combination, in the present invention, it is preferred to use the inspiratory pressure control method to specifically describe the following working modes:
[0049] The working mode of the heat pump water heater is mainly affected by the outdoor air temperature. When the outdoor air temperature is low, the heat pump water heater runs in the low temperature working mode (S1, S2 and S3), and when the outdoor air temperature is high, it runs in the normal working mode (S4, S5 and S6). The application of air injection enthalpy increasing technology can significantly increase the heating capacity and COP of the heat pump water heater under low temperature conditions and broaden its ap...
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