A cascade frequency conversion heat pump system with automatic switching between high and low condensation and its operating method
A heat pump system, automatic switching technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of unfavorable and high power consumption, and achieve the effects of strong practicability, improved energy utilization, and good system stability
Active Publication Date: 2021-12-31
QINGDAO TECHNOLOGICAL UNIVERSITY +1
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Problems solved by technology
However, when the water supply temperature of the air-conditioning unit with this structure is lowered (that is, when the low-pressure ratio is reached), there will be a problem of excessive power consumption, which is not conducive to the realization of energy-saving and emission-reduction goals.
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[0026] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention.
[0027] Such as figure 1 As shown, the cascade variable frequency heat pump system with high and low condensation automatic switching of the present invention includes a low-temperature stage variable frequency compressor 1, a first gas-liquid separator 2, an outdoor evaporator 3, a first liquid receiver 4, and a first throttling Device 5, oil separator 6, refrigerant-refrigerant condenser 7, refrigerant-low temperature water condenser 8, high temperature inverter compressor 9, second gas-liquid separator 10, second liquid receiver 11, second section Flow device 12, refrigerant-high temperature water condenser 13, frequency conversion water pump 14, first solenoid valve 15, seco...
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The present invention provides a cascade frequency conversion heat pump system with automatic switching between high and low condensation and its operating method, wherein the operating method includes the following steps: monitoring the temperature T of the air entering and exiting the evaporating side during operation a‑in and T a‑out and the supply and return water temperature T at the end g and T h ; According to the single-stage low-temperature condensation heat pump system model, calculate the evaporation temperature T e and T con , to determine the suction and exhaust pressure ratio P in this state; according to T g and P to determine the operating mode of the heat pump system, if P>11 or T g >60 o C, operate according to the mode of two-stage high-temperature condensation cascade heat pump system; if P<11 and T g <60 o C. Operate according to the single-stage low-temperature condensing heat pump system mode. The cascade frequency conversion heat pump system and operation method with automatic switching between high and low condensation of the present invention can realize automatic switching between single-stage low-temperature condensation and double-stage condensation cascade according to the heating demand, and can meet the water supply requirements of different temperatures and improve energy efficiency.
Description
technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a cascade heat pump system capable of automatically switching between high and low condensation and an operating method. Background technique [0002] In the existing air conditioner unit, when the heat pump faces high water supply temperature, the pressure ratio of the heat pump unit will increase, which will reduce the unit’s operating performance. In severe cases, it will cause the unit to alarm and shut down, and even the compressor will be damaged. [0003] In order to solve the above problems, some heat pump systems will use a two-stage condensing cascade system to replace the traditional single-stage condensing heat pump system to improve the stability and energy efficiency of the unit. However, when the temperature of the air-conditioning unit with this structure is lowered (that is, when the low-pressure ratio), there will be a problem of excessive pow...
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IPC IPC(8): F25B7/00F25B41/20F25B41/30F25B49/02
CPCF25B7/00F25B41/20F25B41/30F25B49/02
Inventor 梁士民林春文姚俊平林均钊江庚兴梁振标吕章锦姚宁宁
Owner QINGDAO TECHNOLOGICAL UNIVERSITY