Gas supplementing and enthalpy increasing control method of low-temperature type direct-current variable-frequency heat pump system
A DC frequency conversion, heat pump system technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of heating performance attenuation, system reliability, etc., and achieve the effect of improving the operation effect, increasing the low pressure, and increasing the heating capacity
Active Publication Date: 2019-01-29
宁波市海智普智能科技有限公司
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[0005] The technical problem to be solved by the present invention is: to provide a low-temperature direct current frequency conversion heat pump system air replenishment and enthalpy increase control method to solve the problem of attenuation of heating performance and system reliability of the frequency conversion heat pump system in the low temperature environment in practical application engineering
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] like Figure 1~2 As shown, the present invention provides a low-temperature direct current frequency conversion heat pump system air supplement enthalpy control method:
[0021] like figure 1 As shown, a low-temperature DC frequency conversion heat pump system related to the present invention specifically includes: DC frequency conversion compressor, oil separator, high pressure pressure sensor, high pressure pressure switch, four-way reversing, outdoor heat exchanger, heating main electronic expansion Valves, plate heat exchangers, enthalpy injection electronic expansion valves, enthalpy injection solenoid valves, check valves, casing heat exchangers, gas-liquid separators, low-pressure pressure sensors, and low-pressure pressure switches.
[0022] The heating process of the system is as follows:
[0023] like figure 1 As shown in t...
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The invention discloses a gas supplementing and enthalpy increasing control method of a low-temperature type direct-current variable-frequency heat pump system. The key of the method is as follows, anexhaust temperature of the system is detected, when the exhaust temperature is larger than or equal to 70 DEG C, and when an exhaust superheat degree is larger than or equal to 25 DEG C, an enthalpyspraying electromagnetic valve (10) is electrified and started, and an enthalpy spraying auxiliary path is circulated; an enthalpy spraying electronic expansion valve (11) is started, an initial opening degree is 100 PLS and kept for 3 minutes, then adjusting is carried out according to an actual supercooling degree, when the actual supercooling degree is larger than or equal to a target supercooling degree, the opening valve control of the enthalpy spraying electronic expansion valve (11) is carried out; and when the actual supercooling degree is less than the target supercooling degree, theclosing valve control of the enthalpy spraying electronic expansion valve (11) is carried out, when the exhaust superheat degree is less than 20 DEG C, the enthalpy spraying electronic expansion valve(11) is closed, the enthalpy-spraying auxiliary path is not circulated, and the safety and reliability of a compressor are guaranteed. According to the gas supplementing and enthalpy increasing control method of the low-temperature direct-current variable-frequency heat pump system, the problems that in an actual application project, the heating performance of the variable-frequency heat pump system is attenuated and the system reliability is poor in a low-temperature use environment are solved.
Description
technical field [0001] The invention relates to the technical field of a low-temperature DC frequency conversion heat pump system, in particular to a method for controlling air supplementation and enthalpy increase of a low temperature DC frequency conversion heat pump system. Background technique [0002] The lower the outdoor temperature, the worse the heating effect of the air conditioner and the lower the energy efficiency ratio. In the case of heating, as the outdoor ambient temperature continues to drop, the indoor heat load continues to increase. At the same time, the suction specific volume of the refrigerant increases, the suction volume of the unit decreases, and the heating capacity of the system decreases, which cannot meet the indoor heat load. load demand. As the compression ratio of the compressor increases, the coefficient of performance of the system also drops sharply. [0003] In addition, the low pressure of the system decreases with the drop of the ext...
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IPC IPC(8): F25B49/02
CPCF25B49/022F25B2600/2513
Inventor 邓晨冕徐永华
Owner 宁波市海智普智能科技有限公司
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