71 results about "Frost (temperature)" patented technology

The invention provides a condenser type refrigeration cycle intelligent adaptation control method and system, and relates to the technical field of refrigeration. The method comprises the steps that environment state parameters are obtained, the environment frost point temperature is calculated, and an altitude correction factor representing the air side heat exchange capacity is calculated; executing boundary contraction transformation on a preset compressor operation envelope based on the altitude correction factor, and determining an allowable condensing pressure upper limit; an evaporator temperature response sequence is monitored, the time domain integral cumulant of the temperature response sequence relative to the environment frost point temperature is calculated, and the allowable evaporation temperature lower limit is dynamically increased based on the cumulant; constructing a target operation domain according to the allowable condensation pressure upper limit and the allowable evaporation temperature lower limit; and determining a current operation working point, and adjusting the control variable to enable the operation working point to fall into the target operation domain. The safety of the condensation side and the frost prevention stability of the evaporation side can be considered under the high-altitude and complex environment working conditions, and the continuous operation reliability of refrigeration circulation is improved.

The invention relates to the technical field of geological disaster prevention and control, and particularly discloses a freeze-thaw collapse event risk early warning method based on an adaptive weighting algorithm and LSTM, and the method comprises the steps: S1, obtaining and collecting multi-source spatio-temporal data, and obtaining a unified data set; s2, obtaining an index vector of each moment; s3, obtaining a normalized feature vector; s4, obtaining a weighted feature vector at the moment; s5, obtaining prediction risk sequences from a short period to a middle period; s6, obtaining risk early warning output for emergency response and a repair strategy; according to the method, an adaptive weighting algorithm based on contribution degree evaluation is introduced, so that the model can dynamically adjust the relative importance of each input index under different time windows and environment conditions. Compared with a static weight method, the mechanism can automatically amplify physical driving factors directly associated with freeze-thaw collapse, such as the influence of short-term snow melting rate, ground temperature gradient or sudden rainfall accumulation, and meanwhile, inhibits event-independent or noise indexes.

The utility model discloses an evaporator thermal insulation structure of a snowflake machine, which belongs to the technical field of snowflake machines and comprises a barrel-shaped evaporator main body, one end of the evaporator main body is provided with a first rotating shaft, the other end of the evaporator main body is open, and a fixed cover is provided with an end cover which is provided with a second rotating shaft. A first thermal insulation plate and a second thermal insulation plate are arranged at the two ends of an inner cavity of the evaporator body respectively. According to the structure, the temperature isolation function of the first thermal insulation plate and the second thermal insulation plate is utilized to block heat transfer between a high-pressure refrigerant and the two ends of the evaporator body, so that the high-pressure refrigerant can only complete heat transfer with the arc-shaped side face of the evaporator body, and liquid can only frost on the arc-shaped side face of the evaporator body; due to the fact that the high-pressure refrigerant cannot conduct heat transfer with the two ends of the evaporator body, the defect that liquid is frosted at the two ends of the evaporator body can be effectively overcome, cooling capacity waste is reduced, it can be guaranteed that the evaporator body can rotate stably, and practicability is high.

The application provides a kind of hierarchical defrosting heat pump intelligent control method and system, method includes: collecting fin import and export temperature calculation temperature difference and its change rate, assesses the initial state of frost formation;Then combine water side heat exchange efficiency and its attenuation rate, further analyze the influence of frost layer on system performance.Based on this information, the controller uses the frost formation level score function to accurately determine the mild, moderate and severe frost formation state, and automatically matches the corresponding defrosting strategy: maintain heating mode and online defrosting when mild;Progressive bypass defrosting is used when moderate;Switch to refrigeration mode and dynamically adjust the expansion valve opening when severe to enhance the defrosting effect.The application not only improves the defrosting accuracy and system stability, but also improves the operating efficiency and user experience of heat pump equipment in low temperature environment.

The application discloses a defrosting control method, an air conditioning unit and a computer readable storage medium, and comprises the following steps: when the first temperature sensing bag and the second temperature sensing bag are both within T0±a, timing is started; when the first temperature sensing bag or both the first temperature sensing bag and the second temperature sensing bag deviate from the interval of T0±a, timing is stopped, and one of the first temperature sensing bag and the second temperature sensing bag is selected as a main temperature sensing bag according to a preset selection logic; the frost formation rate z is calculated by substituting the maintenance time length t into a preset frost formation rate calculation formula, the current preset defrosting interval is determined according to the frost formation rate and the current outdoor environment temperature parameter, and it is judged whether the defrosting mode is entered. The application detects the pipe temperature and the environment temperature through the double-pipe temperature sensing bag, calculates the frost formation rate through the maintenance time length, judges the current frost formation interval, carries out defrosting treatment according to different frost formation intervals, does not need to additionally increase a humidity detection device, is more accurate in judging the frost formation interval of the unit, and achieves precise defrosting.

The invention discloses a multi-directional heat dissipation self-adaptive orchard early-spring low-temperature frost prevention machine, and relates to the technical field of frost prevention machines. The multidirectional heat dissipation self-adaptive orchard early-spring low-temperature frost prevention machine is fixedly installed in an orchard, the temperature measuring device measures the temperature in the orchard after the machine is powered on, when the environment temperature reaches-2 DEG C, the frost prevention machine starts to work, the heating mechanism converts electric power into heat, and the frost prevention machine is powered on. When the environment temperature reaches 0 DEG C, work is stopped, through cooperation of the bottom guide cover and the wind scooper, when hot air cannot be guided out in time, the hot air moves downwards under pushing of air pressure, the wind scooper is used for separating air continuously flowing upwards, and accumulated air smoothly penetrates through an arc through groove of the wind scooper and flows downwards through a gap between the bottom guide cover and the heat conduction cylinder to be heated again. And the situation that the temperature is reduced due to the fact that internal gas cannot be guided out in time, and less heat is transferred into the air after the internal gas is exhausted is avoided.

The invention discloses a defrosting control method and device, a medium and an air conditioner, and the method comprises the steps: obtaining a target evaluation parameter used for evaluating a defrosting load, and switching a defrosting exit condition from an initial first condition to a second condition easier to trigger when the parameter indicates that the parameter is in a load risk state; according to the scheme, the quit time can be dynamically adjusted according to the actual defrosting load, and it is ensured that the system can respond quickly and quit the defrosting mode immediately after the frost layer is actually melted; the problem that in the prior art, the defrosting exit time is delayed due to fixed duration or preset pipe temperature threshold value control is effectively solved, the situation that the system is in an invalid defrosting state for a long time is avoided, and the operation efficiency of the air conditioner system is remarkably improved.

The invention provides a cold and hot bypass regulation and control method and system for a CO2 environmental test chamber and a medium, and the method comprises the steps: obtaining the temperature in the chamber in real time, comparing the temperature with a set target to decide an operation mode, and synchronously monitoring the temperature of an evaporator and the air return temperature of a compressor in a refrigeration mode to judge the frosting risk and the air return state; a hot gas bypass instruction or a cooling bypass instruction is dynamically triggered accordingly; the opening degree of an interstage bypass valve is adjusted by comparing the air return pressure of a high-stage compressor and the air return pressure of a low-stage compressor in the two-stage cascade operation, and meanwhile a hot air bypass valve of the low-temperature evaporator is adjusted according to the temperature fluctuation condition of the low-temperature evaporator; besides, the exhaust temperature of the compressor is monitored in real time, graded protection is implemented, a local hot gas bypass branch is precisely adjusted by analyzing the temperature difference of all areas of the evaporator, and finally a defrosting program is intelligently started according to a defrosting mark; therefore, the self-adaptive control of the refrigerating system of the CO2 test box is realized, and the effects of saving energy, reducing consumption, preventing frosting and prolonging the service life of equipment are achieved.

The application relates to the technical field of heat pump control, and discloses an air source heat pump variable parameter defrosting control method based on visual recognition technology, which comprises the following steps: acquiring an outdoor heat exchanger image and temperature data; extracting macroscopic coverage representing a frost accumulation area and microscopic characteristic parameters representing physical properties of a frost layer; calculating a thermal attenuation index, determining a correction factor based on the deviation of the index and the macroscopic coverage, and calculating a target defrosting heat load in combination with the microscopic characteristic parameters; determining a target operating frequency of a variable frequency compressor and a target opening degree of an electronic expansion valve according to the target defrosting heat load, and executing defrosting; and monitoring the macroscopic coverage and the coil temperature in real time, and exiting defrosting when the visual readiness and the thermal readiness conditions are simultaneously met. The application realizes accurate prediction of defrosting heat load and on-demand defrosting by introducing a correction factor to compensate for a visual blind area, and solves the problems of incomplete defrosting and low energy efficiency.

The invention discloses refrigeration equipment and a control method of the refrigeration equipment, and relates to the technical field of refrigeration equipment, the refrigeration equipment comprises an evaporator, a water receiving tank, a defrosting component and a controller; the controller is configured to determine the working condition type of the refrigeration equipment; when the working condition type is a medium-temperature working condition, firstly controlling the evaporator to enter a countercurrent defrosting mode, and starting a defrosting component when the evaporator enters a sensible heat defrosting stage; and after the evaporator completes the sensible heat defrosting stage, the reverse flow defrosting mode is quitted, and when the refrigeration equipment meets the defrosting ending condition, operation of the defrosting component is stopped. Under the high-temperature working condition, if the frosting amount is larger than or equal to the preset frosting amount, an evaporator countercurrent defrosting part and a defrosting part are synchronously started, the evaporator quits the countercurrent defrosting mode after completing the sensible heat defrosting stage, and the defrosting part is shut down when the defrosting ending condition is met; and if the frosting amount is smaller than the preset frosting amount, the defrosting control step corresponding to the medium-temperature working condition is executed. Based on the refrigeration equipment, energy consumption can be optimized while the defrosting effect is guaranteed.

This invention provides a control method and air conditioner for preventing frost formation during air conditioning heating. The control method includes: S1, operating in heating mode; S2, acquiring outdoor temperature T, dew point temperature Td, and outdoor unit coil temperature Tw in real time; S3, determining whether T, Td, and Tw meet the frost formation conditions; if yes, maintaining the heating mode and turning on the outdoor heater; if no, maintaining the heating mode and turning off the outdoor heater, returning to step S2; the frost formation conditions are: T≤Td and Tw≤first preset temperature T1. This invention provides a control method and air conditioner for preventing frost formation during air conditioning heating, which can promptly heat and melt the frost on the outdoor heat exchanger, preventing frost buildup and ensuring the air conditioner maintains good heating performance. Furthermore, after meeting the frost formation conditions, this application does not switch the air conditioner from heating mode to defrost mode, but continues to operate in heating mode, fully ensuring the user's heating needs and guaranteeing user comfort.

The invention relates to the technical field of air source heat pumps, in particular to an intelligent defrosting control method and system for a low-temperature variable-frequency air source heat pump and a computer program product. According to the method, characteristics of coil temperature, frost layer thickness, environment humidity and the like collected by a multi-modal sensor are fused, optimal control parameters of a next control period are predicted through a convolution-LSTM deep network, and security redundancy judgment is executed in combination with confidence and a hardware boundary; and triggering a rollback strategy based on the temperature slope and the frost thickness when the confidence coefficient is insufficient. Meanwhile, a distributed reinforcement learning framework is adopted to optimize a prediction model and a rollback control table online, and dynamic balance of defrosting energy consumption and integrity is achieved. Experiments prove that the defrosting energy consumption and the shutdown time can be remarkably reduced, and the stability and the heating performance of the system are improved.

To more reliably suppress a rise in temperature inside a storage facility during defrosting. [Solution] A cooling device having multiple heat exchangers 10 inside a storage 31 is adopted, which is equipped with a first refrigerant passage 51 for supplying refrigerant connected to one heat exchanger A among the multiple heat exchangers 10, a second refrigerant passage 52 for supplying refrigerant connected to another heat exchanger B that has a relatively smaller amount of frost formation than the first heat exchanger A, and a control unit 40 that performs defrost control to cut off the supply of refrigerant to at least one of the first refrigerant passage 51 and the second refrigerant passage 52 for the purpose of defrosting.

This application provides a vehicle defrosting control method, electronic device, and vehicle. The method determines the temperature distribution of relevant areas of the vehicle window through multimodal feature maps. Based on the multimodal feature maps and historical temperature sequences, a frost and fog generation area prediction map can be determined to predict the frost and fog generation area in real time. The frost and fog diffusion trend map sequence can predict the diffusion trend of frost and fog in real time. Combined with the risk score of the risk area, a defrosting path map is dynamically generated to guide the operation of the defrosting equipment. The angle, air volume, temperature, and heating power of the defrosting equipment outlet are adjusted according to the defrosting path map to achieve precise defrosting while reducing energy consumption.

The invention relates to the technical field of refrigeration equipment control, and discloses a cold storage dynamic defrosting control and fault early warning system based on an AI algorithm, and the system comprises a sensing detection assembly and a central processing unit. The central processing unit superposes the micro-disturbance signal into an electronic expansion valve control instruction to drive the valve to generate pressure pulsation excitation; and synchronously acquiring stator current, air return pressure, air return temperature and valve opening signals of the air cooler. The processing unit calculates a thermodynamic residual characteristic value representing the heat exchange performance, an aerodynamic impedance characteristic value representing the aerodynamic load, and a cross-domain coherence characteristic value of the return air pressure and the stator current at the excitation frequency. Based on the multi-dimensional characteristics, the system recognizes that the evaporator is in a frostless, loose-frost, compact-ice or non-frosting type air duct blocking state at present, and performs defrosting, operation maintaining or alarming operation according to the current state of frostless, loose-frost, compact-ice or non-frosting type air duct blocking state. According to the invention, through active excitation and cross-domain feature fusion, quantitative distinguishing of frost layer texture and accurate early warning of non-frosting faults are realized.

The application provides a temperature control type pile-bearing embankment structure with tie beams and a construction method thereof, which comprises, from bottom to top, a threaded pile layer, a connecting layer, a cushion layer, a geogrid layer and an embankment layer; the threaded pile layer comprises a plurality of vertical threaded piles, and each threaded pile comprises a pile body, a pile cap, a pile tip and a heat exchange channel arranged in the pile body; the connecting layer comprises a grid structure formed by tie beams connecting adjacent pile caps and has a built-in grouting pipe network; the application further comprises an energy supply module, an active temperature control module and a monitoring and control module. The threaded pile body cavity and the refrigeration assembly form a closed loop circulation system through the heat exchange pipe, and the coolant flows through the heat exchange pipe to absorb the heat of the soil around the pile under the driving of the compressor; in cooperation with the temperature sensor and the threshold control of the microcontroller, the refrigeration assembly can be automatically started and stopped, the frozen soil temperature can be effectively maintained stable, and the frost-heave settlement can be inhibited.

This invention belongs to the technical field of ambient air vaporizers, specifically a large-diameter ambient air vaporizer with a flow guiding structure. It includes a base, a support platform fixedly connected to the upper end of the base, and a shell fixedly connected to the upper surface of the support platform. A heat exchanger body is housed inside the shell. An outlet pipe is connected to the output end of the heat exchanger body, penetrating one side of the shell. A liquid inlet pipe is connected to the input end of the heat exchanger body, penetrating the other side of the shell. A visual inspection-based defrosting assembly is also installed inside the shell. This invention utilizes a visual inspection-based defrosting assembly, where an elastic cloth, an insulation cover, and a fixing ring together form a barrier matching the area of ​​the frosted region, partially wrapping the pipeline. Subsequently, an electric heating wire is energized, and the heat generated is concentrated by the barrier, focusing on the frosted area, thereby quickly removing the frost from the pipeline surface, improving defrosting efficiency and saving energy.

The invention relates to the technical field of smart homes, and discloses a frosting detection method for an outdoor unit, which comprises the following steps: acquiring operating parameters during heating operation of an air conditioner in real time, the operating parameters comprising the temperature of an outdoor coil and other operating parameters; based on the temperature of the outdoor coil pipe, time sequence attenuation characteristics used for representing dynamic changes of the temperature of the outdoor coil pipe in the frosting process are constructed; fusing the time sequence attenuation features with other operation parameters to obtain fused features; and inputting the fusion features into a pre-trained frosting state classification model to obtain a current frosting state judgment result. According to the scheme, the detection sensitivity at the initial frosting stage and the judgment accuracy and generalization robustness under complex working conditions are remarkably improved, and earlier, more accurate and more stable intelligent detection is achieved. The invention further discloses a frosting detection device for the outdoor unit, an air conditioner and a computer readable storage medium.

[Problem] To provide heating in a low-temperature environment without using an electric heater or the like. [Solution] When a heat medium–heating electric heater 83 cannot be used in a low-temperature environment and it has been determined that there is frost on an outdoor heat exchanger 42, the outside air temperature is above a prescribed condition, and the demand for heating is high, a control device 90 selects to not perform a heat exchange at a high-temperature-side heat exchanger 22 and to perform a hot gas cycle–based defrosting and heating operation in which defrosting is performed by release of heat from a refrigerant at a first evaporator 14 to heat a heat medium flowing through a first low-temperature-side heat exchanger 24 and passage of the heated heat medium through the outdoor heat exchanger 42 and heating is performed by release of heat from a refrigerant at a second evaporator 17 to heat a heat medium flowing through a second low-temperature-side heat exchanger 27 and passage of the heated heat medium through a cooler core 72.

This invention discloses a local nitrogen purging and anti-frost system and method for the windward side duct of an environmental test chamber evaporator. The system includes a nitrogen source, a pressure reducing and flow control assembly, an injection pipeline and injection port, a local dehumidification branch, a sensor group, and a controller. The injection port is located upstream of the mixing section of the windward side duct of the evaporator, and the exhaust port is located in the evaporator section or its downstream duct section, forming a directional local dehumidification channel within the duct. The control method uses dew point temperature and evaporator pressure difference as core criteria, employing a composite judgment logic combining trend and time window to execute a phased control strategy. A pre-purging dehumidification stage is triggered at the initial stage of door opening and cooling or during the transition from damp heat to cooling. A low-temperature maintenance stage is entered when the low-temperature section crosses a preset high-risk temperature zone or when abnormal trends in pressure difference or dew point are detected. This invention limits nitrogen purging to a localized area on the windward side of the evaporator, resulting in minimal temperature disturbance, low gas consumption, and effective suppression of frost blockage, maintaining the evaporator's heat exchange efficiency.

The invention discloses a cryoablation needle target area frosting state identification method based on image processing, and relates to the technical field of cryoablation needles. Constructing a target area original image sequence under the unified space-time coordinate system; outputting corresponding degradation stage information; obtaining a high-fidelity target region clear image sequence; aggregating the signal subspace features through a channel gating mechanism to obtain a signal enhancement feature image set; generating a target area multi-scale semantic feature tensor; outputting an initial frosting probability distribution diagram of the target area; performing form constraint segmentation optimization to obtain a frosted area mask with a consistent form; and a time sequence stable frosting area mask sequence is obtained, a frosting state dynamic evolution model is constructed, and early warning information is displayed in real time. According to the method, the problem of feature submerging caused by mixed noise is effectively inhibited, and the recognizable degree and stability of bottom layer structure information of a target area are remarkably improved in a low-temperature imaging environment.

The application provides a medical ultralow-temperature preservation box local ultrasonic defrosting device and a control method. The device comprises an ultrasonic sensor for detecting the position and thickness of frost and ice; a controller for calculating defrosting ultrasonic wave generation parameters according to the position and thickness of frost and ice; and an ultrasonic wave generator for generating corresponding ultrasonic wave signals according to the defrosting ultrasonic wave generation parameters sent by the controller. The application is based on ultrasonic defrosting technology, can accurately detect the position and thickness of frost and ice, and apply appropriate ultrasonic wave signals according to actual conditions to realize local defrosting and avoid affecting the temperature in the whole preservation box, thereby improving the defrosting efficiency.

A vehicle air-conditioning device includes a compressor, a heating unit, an outside air heat exchanger, a wind speed regulation unit, and a controller. The heating unit includes a heating heat exchanger and heats ventilation air supplied to a space to be air conditioned using a high-pressure refrigerant as a heat source. The wind speed regulation unit regulates a wind speed of air supplied to the outside air heat exchanger. The control unit performs, as a defrosting operation of defrosting the outside air heat exchanger, a dry defrosting mode for evaporating and removing frost adhering to the outside air heat exchanger in a state where the outside air is at a low temperature. In the dry defrosting mode, the controller causes the wind speed regulation unit to supply air to the outside air heat exchanger at a wind speed in a range determined to promote evaporation and removal of frost.

This application discloses a control method, apparatus, storage medium, and heat pump system for a heat pump system. The method includes: acquiring the ambient temperature of the environment in which the heat pump system operates, the temperature of the first fin of a first finned heat exchanger, and the temperature of the second fin of a second finned heat exchanger; determining, based on the ambient temperature, the first fin temperature, and the second fin temperature, whether the heat pump system meets the anti-frost triggering condition or the uniform frost triggering condition; if the anti-frost triggering condition is met, controlling the second heat pump unit to ensure that both the first and second finned heat exchangers are in an unfrost-free state; if the uniform frost triggering condition is met, controlling the first heat pump unit to ensure that both the first and second finned heat exchangers are in a frosted state. This method can achieve the goal of both finned heat exchangers in the heat pump system being frosted or neither being frosted, effectively avoiding the uneven frost phenomenon caused by only a single finned heat exchanger being frosted.

The invention discloses an ultralow-temperature transparent frost prevention material as well as a preparation method and application thereof. The frost prevention material contains a polymer which can be dissolved in water and an organic solvent. The anti-frost material disclosed by the invention can be suitable for preventing frost on the surface of the material in an ultralow-temperature environment. Meanwhile, the anti-frost material disclosed by the invention has good anti-frost performance, and the cryopreservation tube coated with the anti-frost material disclosed by the invention can still keep the surface clear and not frosted in an environment of-80 DEG C for 4 hours, so that the anti-frost material has an obvious anti-frost effect. The anti-frost material also has ultrahigh light transmittance, when the anti-frost material is applied to the surface of a quartz plate, the light transmittance is 97% or above under the wavelength of visible light, and after the anti-frost material is coated on the surface of glass and then placed in an environment of-80 DEG C to be taken out, patterns on the surface of the glass can still be seen through the glass. The anti-frost material disclosed by the invention shows excellent anti-frost performance and light transmittance.

The invention discloses an intelligent temperature control system for condensation water taking, and relates to the technical field of temperature control and regulation, the intelligent temperature control system comprises a data acquisition module, a data processing module, a temperature control decision module and a feedback module, the acquisition module periodically acquires condenser operation parameters, air temperature and air humidity through multiple types of sensors, and generates a parameter table with a timestamp; the processing module carries out filtering and denoising, abnormal point elimination and dimension standardization preprocessing on the parameter sequence in the parameter table, and then outputs a standardized effective parameter table; the decision-making module is used for constructing a frost resistance coefficient according to the effective parameter table by fusing multi-dimensional parameters so as to accurately match the defrosting heat and duration, pre-judging the pipe surface temperature through a transient recovery model after defrosting, and adjusting the refrigeration power in combination with a self-adaptive temperature control algorithm, and the feedback module is used for continuously optimizing model parameters and algorithm adjusting coefficients based on the operation deviation so as to accurately adjust the defrosting heat and duration. Energy consumption optimization, heat exchange efficiency improvement and precise temperature control adaptation are achieved.

The utility model discloses an anti-freezing faucet which comprises a faucet body, a gas injection assembly and a control module used for controlling a gas injection unit are arranged on the faucet body, the gas injection assembly comprises a connecting water pipe installed on the faucet body, a pressurizing cylinder is installed on the connecting water pipe, an exhaust valve is installed on the connecting water pipe, and the pressurizing cylinder is connected with the exhaust valve. The exhaust valve is located in the pressurizing cylinder, a pressurizing plate is arranged in the pressurizing cylinder, and the side face of the pressurizing plate is attached to the inner wall of the pressurizing cylinder. According to the anti-freezing faucet, air can be actively injected into the faucet through the air injection assembly, and water is effectively prevented from being frozen at the low temperature; according to the water faucet, the risks that the water faucet is damaged due to freezing and a water pipe cracks due to freezing are avoided, water resource waste and maintenance cost are reduced, automatic control is achieved through cooperation of the control module and the detection box, gas injection operation can be automatically started or stopped according to changes of the internal pressure of the water faucet, frequent manual intervention is not needed, and use convenience is greatly improved.

This invention discloses a heat exchanger, a control method, an air conditioner, and a storage medium. The heat exchanger includes a heating medium inlet, a heating medium outlet, a subcooling branch, and at least one heat exchange branch. The subcooling branch is connected to the heating medium inlet, and the heat exchange branch is connected between the heating medium outlet and the subcooling branch. Each heat exchange branch is provided with at least one first throttling element, which is used to throttle the working medium passing through the heat exchange branch. This invention uses a subcooling branch and a heat exchange branch for staged heat exchange, and at least one first throttling element is provided on each heat exchange branch to throttle the working medium in the heat exchange branch, thereby suppressing the temperature slippage phenomenon of the non-azeotropic refrigerant in the heat exchanger, keeping the non-azeotropic refrigerant in the heat exchanger as close to 0°C as possible to avoid frost and ice formation in the heat exchanger and ensure the working efficiency of the heat exchanger.

The present application relates to the technical field of heat pump air conditioners, and particularly relates to a heat pump air conditioner and a defrosting operation control method thereof. The control method can control the heat pump air conditioner to perform frost inhibition operation on the upper half and the lower half of the outdoor heat exchanger in sequence when frost formation on the outdoor heat exchanger is less and indoor heating load is small, and the outdoor ambient temperature is high at this time, thereby removing the frost attached to the surface of the outdoor heat exchanger without stopping the heating operation, and ensuring the thermal comfort of the indoor environment while inhibiting frost formation. In addition, the frost inhibition operation will increase the power consumption of the air conditioner and reduce the operation efficiency of the air conditioner. If the outdoor ambient temperature decreases and the frost inhibition effect cannot be guaranteed during the frost inhibition operation, the air conditioner stops the frost inhibition operation and switches to the normal heating operation mode, thereby avoiding the situation that the frost inhibition effect is poor and the operation efficiency of the air conditioner is reduced, and ensuring the thermal comfort of the indoor environment.

The present disclosure relates to a defrosting control method, device and system, an air conditioner and a multi-stage refrigeration air conditioning system. The defrosting control method comprises: obtaining the temperature and humidity of the inlet and outlet of an air conditioner heat exchanger, the air speed into and out of the heat exchanger, and the weight of condensate water; determining the frost amount on the heat exchanger according to the temperature and humidity of the inlet and outlet of the air conditioner heat exchanger, the air speed into and out of the heat exchanger, and the weight of condensate water; determining whether the frost amount on the heat exchanger is greater than or equal to a first defrosting threshold; and in the case that the frost amount on the heat exchanger is greater than or equal to the first defrosting threshold, controlling the air conditioner to stop and start defrosting. The present disclosure can directly and accurately calculate the frost amount on the surface of the heat exchanger to directly determine whether defrosting should be started, thereby more accurately determining whether to start the defrosting mode and avoiding false defrosting and incomplete defrosting.