138 results about "Frost (temperature)" patented technology

The invention discloses an existing wind power blade electrothermal film deicing control method based on big data, and relates to the technical field of wind turbine generator operation control and ice prevention and removal. Frost ice / glaze ice probability output by an ice type discrimination model does not only give an alarm any more, but is directly converted into an increase / decrease coefficient constrained by boundary and monotonicity; energy can be fully put in a glaze ice scene, and overheating and over-consumption can be avoided in a frost ice scene; according to the method, the change trend of wind speed, temperature and relative humidity is introduced as modulation factors, the working condition of forming / turning glaze ice is responded in advance, and insufficient deicing caused by static threshold hysteresis is reduced; according to power deviation correction, a unit wind speed-power curve serves as a reference, a dead zone, segmented gain and accumulative saturation structure is adopted, on the premise of not depending on an external icing sensor, extrinsic performance of pneumatic degradation is closed into controlled quantity, sensitivity and stability are considered, and start-stop oscillation and duration drift are reduced.

The invention discloses a loading lap joint device for cold chain transportation and sorting and a using method thereof, and relates to the technical field of cold chain transportation, the loading lap joint device comprises a drawing cold storage module, a cold storage module, a cold storage module, a cold storage module, a cold storage module, a cold storage module and a cold storage module, the drawing cold storage module is slidably mounted on a sliding groove in the bottom of a cold chain vehicle compartment, and a cold storage cavity is formed in the drawing cold storage module; the linkage defrosting mechanism comprises a frame type defrosting scraping plate arranged above the drawing cold storage module, a frost collecting groove is formed in the side edge of the cold storage cavity, and scraped frost water is guided into the frost collecting groove through the defrosting scraping plate; the lap joint interface module is arranged at the front end of the drawing cold storage module and comprises a conveying plate and a temperature adjusting air curtain which are movably hinged, and the temperature adjusting air curtain communicates with the cold storage cavity and the frost collecting groove through an air duct and releases cold air; the control unit is used for monitoring the temperature in the compartment and the platform position and adjusting the air speed of the air curtain to control the cold air circulation amount. The system not only can automatically remove the frost layer in the carriage and effectively reduce the environment temperature during loading, but also can be flexibly butted with a sorting line, so that energy conservation, high efficiency and temperature control guarantee of a cold chain loading link are realized.

The invention relates to the technical field of heat pump control, and discloses a defrosting method and device of a heat pump system and the heat pump system.The defrosting method comprises the steps that the temperature and humidity of gaps of a fin type heat exchanger are monitored in real time; and when the temperature is lower than or equal to the threshold value of the dynamic dew point temperature plus the safety margin and the humidity is higher than or equal to the threshold value, it is judged that the frosting prevention condition is met, the gap temperature is increased by adjusting the refrigerant bypass valve, the gap humidity is reduced by adjusting the airflow adjusting valve, and therefore frosting is actively prevented. And if the frost layer appears, short-time refrigeration interruption or low-power heating is started for defrosting according to the thickness of the frost layer or a pressure difference signal. And the formed ice layer is forcibly removed by switching the flow direction of the refrigerant and heating. By means of three-level linkage control, accurate defrosting in the whole process from prevention to removal is achieved, energy waste is effectively avoided, the defrosting efficiency and operation stability of the system are improved, and the user experience is improved.

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 provides a heat pump intelligent control method and system for hierarchical defrosting, and the method comprises the steps: collecting the temperature of an inlet and an outlet of a fin, calculating the temperature difference and the change rate thereof, and evaluating the initial state of frosting; and the influence of the frost layer on the system performance is further analyzed in combination with the water side heat exchange efficiency and the attenuation rate thereof. Based on the information, the controller accurately judges mild, moderate and severe frosting states by using a frosting grade scoring function, and automatically matches corresponding defrosting strategies: when the frosting state is mild, the heating mode is maintained, and online defrosting is carried out; when the temperature is moderate, a progressive bypass is adopted for defrosting; and switching to a refrigeration mode and dynamically adjusting the opening degree of the expansion valve to strengthen the defrosting effect when the temperature is heavy. The defrosting precision and the system stability are improved, and the operation efficiency and the user experience of the heat pump equipment in the low-temperature environment are improved.

The invention discloses an ultralow-temperature vacuum pump with an efficient air compression function, and relates to the technical field of low-temperature vacuum pumps, the ultralow-temperature vacuum pump comprises a low-temperature vacuum pump body, the low-temperature vacuum pump body comprises a barrel, an inner cavity of the barrel is fixedly connected with a cold plate body, and the bottom of the barrel is fixedly communicated with a backing pump; a defrosting mechanism is arranged on the surface of the barrel; according to the ultralow-temperature vacuum pump with the efficient air compression function, by arranging the defrosting unit and the dehumidification unit, the purpose of reducing frosting can be achieved, when the low-temperature vacuum pump operates, moisture is effectively prevented from entering the low-temperature vacuum pump, and the air compression efficiency is improved. The frosting speed of the adsorption cold plate in the low-temperature vacuum pump is reduced, so that the adsorption time of the adsorption cold plate is prolonged, meanwhile, frost on the surface of the adsorption cold plate can be effectively removed, and the operation duration of the low-temperature vacuum pump and the utilization rate of equipment are improved.

An air conditioner defrosting method. In the air conditioner's heating process, after the end of every defrosting procedure, the temperature of the outdoor heat exchanger coil and the time used over the course of the defrosting procedure can be measured and recorded. The defrosting situation of the air conditioner is reflected, and an initial determination of whether there is frost accumulation is made. After the initial determination, the air conditioner continues carrying out the heating procedure, and when specific conditions are met, it carries out a third defrosting procedure. When second determination results indicate that there is frost accumulation, the frost accumulation problem is deemed to be quite severe with a risk of icing up, and it is necessary to conduct forced intervention and carry out forced defrosting steps.

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 present application relates to the technical field of household appliances, in particular to a dehumidifier and a control method thereof. The control method of the dehumidifier comprises: obtaining a first temperature of an evaporator; determining an actual frost accumulation time according to whether the first temperature is less than a first preset temperature; and judging whether the evaporator meets a first defrosting condition according to the actual frost accumulation time. According to the present application, whether the evaporator meets the first defrosting condition is judged according to the actual frost accumulation time, which can improve the accuracy of defrosting judgment, thereby reducing the possibility of invalid defrosting, and further avoiding the problem of dehumidification efficiency reduction caused by too long defrosting time.

The utility model belongs to the technical field of evaporators, and particularly relates to a freezing evaporator assembly which comprises a base. An evaporator main body is mounted on one side in the base; a blower device shell is fixedly connected to one side of the exterior of the base; a first servo motor is mounted in the blower device shell; the output end of the first servo motor is fixedly connected with fan blades; in the long-term use process of the freezing evaporator, due to the facts that the surface temperature of the freezing evaporator is low, frosting and freezing are likely to occur, too thick frost blocks air circulation, the heat exchange efficiency is reduced, and the refrigerating effect is poor, when frost appears on the surface of the evaporator body, the defrosting effect can be achieved only by opening the heating piece, and the defrosting efficiency is improved. And the influence of thicker frost on the refrigeration effect is reduced.

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 invention discloses a micro-area fogdrop-airflow synergistic rime formation method and system, and relates to the technical field of artificial rime formation, and the method comprises the following specific steps: step 1, dividing and preparing a test area; 2, parameters of a fog drop generation system are set; 3, setting parameters of an airflow generation system; 4, fog drops are generated and distributed; 5, conveying airflow generated by the airflow generation system to the micro-area through a pipeline, and arranging a flow guide device at an outlet of the pipeline for further adjusting the direction and speed distribution of the airflow; meanwhile, in the airflow conveying process, the airflow temperature is monitored and adjusted in real time through the temperature control device, and it is guaranteed that the airflow temperature is stabilized within the set range. According to the micro-area fog drop-airflow synergistic rime forming method and system, by accurately regulating and controlling generation and distribution of micro-area fog drops and the speed, direction and temperature of airflow, accurate control over the rime forming process is achieved, the rime forming efficiency and the simulation effect are improved, and the requirements of different fields for rime forming research are met.

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.

A kind of micro-channel heat exchanger heat pump system and its working method, the micro-channel heat exchanger heat pump system includes compressor, four-way reversing valve, indoor heat exchanger, micro-channel heat exchanger, 4 ball valves, 2 throttles;Micro-channel heat exchanger works when in frosting condition, there is the problem that frost rate is faster, heat exchange performance attenuates faster, in addition, in defrosting process, there is also the problem that defrosting water is more difficult to remove, and defrosting efficiency is low;The present application proposes a kind of micro-channel heat exchanger heat pump system and its working method, in frosting process, utilize the high-temperature refrigerant heat and compressor waste heat of indoor heat exchanger to heat low-temperature refrigerant, improve evaporation temperature, delay frost, in defrosting process, utilize the heat source provided by compressor waste heat, shorten defrosting time, improve defrosting efficiency.

The invention discloses an air conditioner and a defrosting judgment method thereof, electronic equipment and a storage medium. The method comprises the steps that environment parameters and system operation parameters are collected; and a plurality of real-time judgment indexes and a frosting risk index F are obtained based on the environment parameters and the system operation parameters, and if any real-time judgment index does not meet the corresponding preset requirement and F is larger than a set threshold value F0, it is judged that the air conditioner needs to be defrosted. According to the method, the multiple real-time judgment indexes and the frosting risk index F are obtained on the basis of the environment parameters and the system operation parameters, double verification is conducted by combining the real-time judgment indexes and the frosting risk index F, then whether the air conditioner evaporator needs to be defrosted or not is judged, the accuracy rate is higher than that of the prior art depending on a single temperature difference index, and therefore the technical problems of mistaken defrosting and delayed defrosting are solved.

The invention discloses a defrosting control method and device of an air conditioner, the air conditioner, a storage medium and a computer program product.The air conditioner outdoor heat exchanger comprises at least two defrosting areas capable of being dynamically divided, and each defrosting area is connected with a compressor exhaust pipeline through an independent bypass pipeline; the bypass pipeline is provided with a bypass electronic expansion valve used for adjusting flow and a bypass electromagnetic valve used for controlling on-off. The method comprises the steps that during heating, an outdoor heat exchanger surface heat image is collected, frost layer distribution and thickness are analyzed and recognized, and a frost layer distribution diagram is generated; according to the image, areas needing to be defrosted and areas not needing to be defrosted are determined from the defrosting areas; for the area needing to be defrosted, a bypass electromagnetic valve corresponding to a bypass pipeline is controlled to be opened, the opening degree of a bypass electronic expansion valve is adjusted, and the high-temperature refrigerant flows into the area to be defrosted; and for the area without defrosting, the bypass electromagnetic valve corresponding to the bypass pipeline is controlled to be closed, so that the refrigerant keeps the heating circulation flow direction to continuously supply heat to the indoor space. According to the scheme, the defrosting efficiency and stability are improved.

Systems and methods implementing a frost sensor comprising a substrate (S); and sub-sensors disposed on the substrate. The sub-sensors comprising: a resistance-based sub-sensor (RSS) formed of a first trace disposed on S in a winding pattern and configured to measure a temperature; a capacitance-based sub-sensor formed of a second trace defining a first electrode and a third trace defining a second electrode (wherein (i) the first and second electrodes comprise interdigitated fingers or other interdigitated structures (including, but not limited to, round, spiral interdigitated electrodes, etc.) configured to detect a change in capacitance due of frost, ice or water, and (ii) the second trace is integrally formed with the first trace); and another RSS formed of a fourth trace defining a third electrode and a fifth trace defining a fourth electrode (wherein (i) the third and fourth electrodes comprise interdigitated fingers or other interdigitated structures (including, but not limited to, round, spiral interdigitated electrodes, etc.) configured to detect a change in resistance due to the frost, ice or water, and (ii) the fourth trace is integrally formed with the third trace).

The invention relates to the technical field of panel defogging and defrosting, in particular to an efficient defogging and defrosting system for a front transparent panel of an intelligent two-wheeled vehicle, the surface temperature and the frost layer thickness of the transparent panel are detected through an environment sensing unit, the temperature and humidity inside and outside the vehicle are collected, and an intelligent control unit controls the defogging and defrosting of the front transparent panel according to the temperature and humidity data and the frost layer thickness collected by the environment sensing unit. And whether a demisting condition or a defrosting condition is achieved or not is judged, a hierarchical control strategy is executed according to the mist level or the frost layer thickness, and a transparent heating layer, an airflow regulation and control module, an auxiliary drying assembly and a low-temperature defrosting strengthening module in the transparent panel are controlled to conduct defrosting and demisting. According to the technical scheme, quick and efficient defrosting in the low-temperature environment can be achieved, efficiency is high, secondary icing and fogging are prevented, adaptability is high, and meanwhile the light transmittance of the transparent panel is guaranteed.

The utility model discloses an air energy ultralow-temperature heat pump, which belongs to the technical field of air energy heat pumps and comprises a water tank (a condenser is arranged in the water tank), an external unit (comprising an evaporator, a compressor and an electronic expansion valve) and an intelligent defrosting system. During working, the outdoor unit evaporator absorbs heat of external low-temperature air through the air blower, so that a refrigerant is evaporated and is compressed into high-temperature and high-pressure gas through the compressor, and then the high-temperature and high-pressure gas releases heat to water in the water tank condenser. And the condensed refrigerant liquid returns to the evaporator for circulation through throttling and pressure reduction. During operation, the infrared frosting detection sensor on the surface of the evaporator monitors frosting, and data are transmitted to the controller. When frosting reaches the set thickness, the controller starts the hot gas bypass electromagnetic valve, part of high-temperature refrigerant gas directly enters the evaporator to be defrosted, and meanwhile the electric heating fan is started for assisting. The heat pump can stably and efficiently heat in an ultralow-temperature environment, the defrosting period is prolonged, and reliable operation is guaranteed.

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 utility model discloses an air-cooled heat pump defrosting chassis, which belongs to the technical field of air-cooled heat pump defrosting chassis, and adopts the technical scheme that the air-cooled heat pump defrosting chassis comprises a chassis component, a unit structure is arranged at the top of the chassis component, sliding rods are arranged on the front side and the rear side of the chassis component, and defrosting boxes are arranged at the tops of the sliding rods; a heating assembly is connected to the inner wall of the defrosting box in a bolted mode, and the problems that an existing air-cooled heat pump defrosting base plate is prone to being blocked in the using process, impurities such as silt, rust and microorganism wreckage in water are prone to being gradually accumulated in the long-term discharging process along with frost water, a drainage pipeline is blocked, the frost water cannot be normally discharged, and the frost water cannot be normally discharged are solved. The problems that when defrosting is carried out, a frost layer is slowly melted only through natural environment temperature rising, or a reverse circulation defrosting method low in efficiency is adopted, and the defrosting process is long in time consumption and inconvenient to use by a user are solved.

The utility model discloses an anti-freezing water segregator of a snowmaker, which comprises a water segregator main water pipe and a water segregator gas tank, and the two ends of the water segregator main water pipe are respectively provided with a water segregator plug and a water inlet elbow; the water segregator gas tank is arranged outside the water segregator main water pipe; the two ends of the water segregator gas tank are sealed, the water segregator gas tank is provided with a gas inlet pipe and a gas outlet pipe, an arc-shaped gas channel is formed among the gas inlet pipe, the water segregator gas tank and the gas outlet pipe, and the shunt valve penetrates through the arc-shaped gas channel to be connected with the water segregator main water pipe. The air inlet pipe is communicated with an exhaust pipe of the compressor, and the air outlet pipe is communicated with an air inlet of the snowmaker head. Therefore, the high-temperature gas normally discharged by the compressor passes through the periphery of the shunt valve, so that the shunt valve is preheated and subjected to heat preservation, and the problem of freezing of the shunt valve is effectively prevented. Meanwhile, exposed circuits and electric appliance elements are omitted, electric drive is not needed, and therefore the failure rate is reduced, the performance stability and the operation safety are ensured, and the service life is prolonged.

A device for testing temperature conduction and frost-heaving strain of a concrete lining canal comprises: a frost-heaving device comprising a lining canal body and a temperature control device, the temperature control device being configured to provide a predetermined temperature for the lining canal body; a detection device comprising a transverse deformation detection device, a vertical deformation detection device and a plurality of temperature sensors, the transverse deformation detection device being configured to detect a transverse frost-heaving strain parameter of the lining canal body, and the plurality of temperature sensors being arranged along an axial direction of the lining canal body, being embedded inside the lining canal body and being configured to detect temperature conduction performance of the lining canal body.

The inference device calculates an estimated value of the time required for frost melting relative to the defrost temperature information, wherein the defrost temperature information represents the temperature of the outdoor heat exchanger of the outdoor unit of the air-conditioning device or the state of change of the temperature, and the time required for frost melting is the period during which the temperature of the outdoor heat exchanger is stable within a first range. The inference device comprises: a first data acquisition unit, which acquires the defrost temperature information of the air-conditioning device; and an inference unit, which uses a learned model for inferring the time required for frost melting based on the defrost temperature information, and calculates the estimated value of the time required for frost melting relative to the defrost temperature information based on the defrost temperature information acquired by the first data acquisition unit.

The embodiment of the invention provides an air conditioner defrosting method and device, an air conditioner and a medium. The method comprises the steps that the current environment temperature, the current fin temperature, the current indoor temperature and the set temperature are obtained; the current frost layer thickness is determined according to the current environment temperature; according to the set temperature, the current indoor temperature and the current environment temperature, a heating power threshold value is determined; according to the heating power threshold value, a frost layer thickness threshold value corresponding to the heating power threshold value is determined; and if the current frost layer thickness is greater than or equal to the frost layer thickness threshold value, entering a defrosting mode. According to the embodiment of the invention, the corresponding frost layer thickness can be accurately estimated according to the environment parameters in the current environment, and the heating power threshold value is dynamically adjusted to ensure that the current heating power threshold value corresponds to the working condition requirement corresponding to the current environment; according to the heating power threshold value, the corresponding frost layer thickness is determined to serve as the triggering standard of the defrosting mode, the defrosting accuracy is improved, and meanwhile the heating efficiency is improved.

The application relates to the air conditioning technical field, and discloses a system for defrosting, which comprises a frosting detection device and a controller. The frosting detection device is electrically connected with the controller and is used for detecting frosting conditions of a heat exchanger and sending the frosting conditions to the controller. The controller is electrically connected with an external defrosting device, and is used for triggering the external defrosting device to heat the heat exchanger when the frosting conditions are frosting conditions of the heat exchanger. The external defrosting device is arranged on the heat exchanger and is used for heating the heat exchanger. In this way, the heat exchanger surface can be heated, so that the frost on the heat exchanger is melted. Since there is no refrigerant flow reversal during the defrosting process, it is not necessary to reestablish the balance, so that the probability of indoor temperature fluctuation can be reduced. The application further discloses an air conditioner.

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.