153 results about "Heat exchanger temperature" patented technology

The invention provides an outer ring temperature sensor fault detection method, an air conditioner and a readable storage medium. The outer ring temperature sensor fault detection method comprises the steps that the outer ring temperature is obtained through an outer ring temperature sensor, and the outdoor heat exchanger temperature and the compressor temperature are obtained through an outdoor heat exchanger temperature sensor; if the first preset condition is met, the air conditioner is controlled to operate in a heating mode for a first preset duration according to the outer ring temperature; and after a control strategy is determined according to the relation between the cooling rate and a preset rate and the air conditioner is controlled to operate, whether an outer ring temperature sensor breaks down or not is judged according to the temperature of the outdoor heat exchanger. The first preset condition is that the current heating operation, the outer ring temperature, the outdoor heat exchanger temperature and the compressor temperature are all smaller than a first preset temperature value, and the difference value between the outer ring temperature and the minimum value in other temperatures is larger than or equal to a second preset temperature value. According to the invention, the accuracy of judging the fault of the outer ring temperature sensor is improved aiming at low-temperature influence.

The invention provides a self-cleaning control method and device for an air conditioner, a storage medium and a program product, and the method comprises the steps that after the air conditioner enters a sleep mode, the air conditioner is controlled to enter a refrigeration condensation stage, so that condensation is formed on the surface of an indoor heat exchanger of the air conditioner; when the current moment reaches the preset moment and the temperature difference value between the indoor environment temperature and the set temperature of the air conditioner is smaller than or equal to a preset temperature difference threshold value, the air conditioner is controlled to enter a refrigeration frosting stage; and when it is detected that the temperature of the indoor heat exchanger meets the preset defrosting execution condition, a defrosting stage is started, non-reversing defrosting is conducted by controlling the rotating speed of an inner fan, the frequency of a compressor, the opening degree of a throttling device and the rotating speed of an outer fan, and self-cleaning of the air conditioner is achieved. According to the scheme provided by the invention, air conditioner self-cleaning can be carried out without specially consuming time.

The invention relates to the technical field of air conditioners, discloses a defrosting control method for a variable frequency heat pump air conditioner and an outdoor heat exchanger system, and aims to solve the problems that condensate water affects the heat exchange efficiency and the indoor temperature fluctuates in an existing heat pump air conditioner. The super-hydrophobic fins of the outdoor heat exchanger promote the condensed water to fall off quickly so as to maintain the heat exchange efficiency; when it is detected that the temperature of the outdoor heat exchanger is continuously lower than 0 DEG C and reaches a first preset time threshold value, a defrosting mode is controlled to be started; in the defrosting mode, the expansion valve is controlled to be opened to the maximum opening degree so as to reduce or stop throttling, the air speed of the indoor fan is reduced, and meanwhile the heating flow direction of the four-way valve is kept unchanged; and when it is detected that the temperature of the outdoor heat exchanger is continuously higher than 0 DEG C and reaches a second preset time threshold value, the defrosting mode is controlled to exit, and normal control is recovered. According to the invention, the energy efficiency and reliability during conventional operation are improved, and the indoor temperature fluctuation during defrosting is reduced.

The utility model belongs to the technical field of heat supply engineering, solar photovoltaic photo-thermal and shallow geothermal energy comprehensive utilization, and discloses a PVT heat pump soil cross-season energy storage coupling municipal heat source combined heat and power generation system suitable for a traditional radiator. Comprising a municipal thermodynamic system, a solar PVT heat pump soil cross-season energy storage system, a tail end radiator system and an intelligent monitoring control system. The municipal thermodynamic system comprises a municipal thermodynamic primary net, a municipal thermodynamic secondary net, a circulating water pump, a plate heat exchanger, a temperature sensor and an electric valve; the solar PVT heat pump soil cross-season energy storage system comprises a solar PVT array, a solar heat exchange unit, a buried pipe system, an electricity meter, an inverter, a heating heat pump unit and an electric valve set. The intelligent monitoring control system comprises a temperature sensor, an electric valve, a heating heat pump unit and a circulating water pump. Solar energy, air energy and shallow geothermal energy are fully utilized, energy is saved, carbon is reduced, and meanwhile the tail end heating effect is guaranteed.

The invention discloses a hydrogen storage, hydrogen injection, hydrogen transportation and hydrogen supply system and method of a low-pressure hydrogen storage station, relates to the technical field of hydrogen energy utilization and hydrogen refueling stations, and comprises the hydrogen storage, hydrogen injection, hydrogen transportation and hydrogen supply system of the low-pressure hydrogen storage station and the hydrogen storage, hydrogen injection, hydrogen transportation and hydrogen supply method of the low-pressure hydrogen storage station. A hydrogen storage, hydrogen injection, hydrogen transportation and hydrogen supply system of a low-pressure hydrogen storage station comprises a gas discharging column module and a gas discharging column module, wherein the design pressure is 22 MPa, the working pressure is 20 MPa, two CGA1350 interface hoses are configured, the length of the hoses is more than 5 meters, the hoses are provided with snap valves, and the gas discharging column module is used for discharging hydrogen through 20 MPa / 45 MPa double-pressure platform staged compression, three-stage sequence valve group dynamic pressure regulation (35 / 40 MPa threshold value) and pre-cooling heat exchanger temperature closed-loop control (85 DEG C limit value protection); and through the integrated design of the 35 cubic meter heat storage system and the waste heat recovery water pump, the core breakthrough that the hydrogen storage efficiency is improved by 25%, the filling temperature rise control precision is + / -1.5 DEG C, and the safety response time is shortened to 0.5 second is achieved.

The refrigerating system comprises a compressor, an evaporative condenser, a gas-liquid separator, a heat regenerator, an evaporator, a heat recoverer, an energy storage device, a terrace heat exchanger, an oil separator, an oil cooler, a water pump, a temperature control valve, an electronic expansion valve, a three-way valve, a control device, a temperature sensor and a pressure sensor. The control device collects signals of compressor outlet and inlet pressure sensors and temperature sensors, evaporator outlet pressure sensors and temperature sensors, an oil return temperature sensor and a floor heat exchanger temperature sensor. Condensing pressure is adjusted by controlling starting and stopping of a condenser side fan and a water pump, and the opening degree of the three-way valve is controlled to enable the oil return temperature to be within a safe range. The evaporation temperature is maintained by adjusting the opening degree of an evaporator inlet electronic expansion valve. By monitoring the terrace temperature in the refrigeration house, the electromagnetic valve is controlled to adjust the refrigerant flow in the terrace heat exchanger to maintain the outlet temperature, and the energy storage device is intermittently put into the refrigeration house to improve the system energy efficiency.

To provide an abnormality diagnostic device capable of appropriately diagnosing the nature of abnormalities occurring in a fuel cell device.SOLUTION: The abnormality diagnostic device determines that an abnormality has occurred in a heat exchange temperature measurement device when both a first determination condition that the heat exchanger temperature measured by the heat exchange temperature measurement device is at a predetermined high temperature state and a second determination condition that the heat exchanger temperature measured by the heat exchange temperature measurement device is higher than the exhaust gas temperature measured by the exhaust gas temperature measurement device are satisfied.SELECTED DRAWING: Figure 3

The invention relates to the technical field of heat exchange, in particular to a shell-and-tube efficient heat exchanger and a preparation method thereof.The shell-and-tube efficient heat exchanger comprises a shell, an end socket assembly, a tube bundle assembly, a first flow control assembly, a second flow control assembly, a first fixing assembly, a second fixing assembly and the like. The tube bundle assembly, the first flow control assembly and the second flow control assembly are arranged in the depth direction of the shell, the tube bundle assembly penetrates through the first flow control assembly and the second flow control assembly and is slidably connected with the first flow control assembly and the second flow control assembly, and the distance adjusting assembly in the shell can adjust the distance between the first flow control assembly and the second flow control assembly. The liquid inlet part and the liquid outlet part are distributed diagonally, the first flow control assembly and the second flow control assembly are combined to guide fluid to flow, and a pressure stabilizing part, a heat conduction assembly and the like are arranged. The tube bundle assembly adopts a multi-stage reducing design, and the second fixing assembly comprises a flow collecting piece and a fixing piece. According to the scheme, tube pass and shell pass media are prevented from being mixed, the thermal expansion coefficient of the joint is reduced, stress concentration is reduced, the problem of unbalanced heat transfer efficiency caused by uneven distribution of shell pass fluid is solved, and the temperature uniformity, heat exchange efficiency and other effects of the heat exchanger are improved.

The control method comprises the steps that the rotating speed of a high-temperature-stage inverter compressor is mainly comprehensively determined by the high-temperature-stage exhaust temperature, the high-temperature-stage condenser temperature, the high-temperature-side outlet temperature of an intermediate heat exchanger and the high-temperature-stage return air temperature; through dynamic adjustment of the first fuzzy PID controller, the working condition and energy efficiency of the high-pressure side of the system are optimized; the rotating speed of the low-temperature-stage frequency conversion compressor is mainly comprehensively determined by the temperature in the box, the real-time rotating speed of the high-temperature-stage compressor, the low-temperature-stage exhaust temperature, the temperature of the intermediate heat exchanger and the low-temperature-stage return air temperature, and the rotating speed is dynamically adjusted through the second fuzzy PID controller so as to ensure that the temperature in the box is accurate and stable and is matched with the high-temperature-stage capacity in real time. Through cooperative control of the parameter groups, the problems of low efficiency and unstable operation caused by mismatching of two-stage capabilities of the cascade system are solved, and efficient, stable and reliable operation of the system under all working conditions is realized.

The invention relates to the technical field of water treatment devices, and discloses a control method of a water treatment device, the water treatment device and a medium. The method comprises the steps that a controller detects the temperature of a heat exchanger through a first temperature sensor, and when the temperature is lower than a heat preservation threshold value, a driving pump and a heating device are started; hot water flows in the heat preservation circulation loop until the heat exchanger reaches the set temperature. Through double-pump division of labor, a heat preservation circulation task is undertaken by the driving pump, the running time of the circulating pump is greatly shortened, the service life of the circulating pump is remarkably prolonged, meanwhile, the instant heating effect is guaranteed, and the system reliability is improved.

In a refrigerant circuit in which an indoor unit is connected to an outdoor unit by a refrigerant pipe, a predetermined amount of refrigerant is filled, the outdoor unit has a compressor, an outdoor heat exchanger, and an expansion valve, and the indoor unit has an indoor heat exchanger. The air conditioner has a calculation model that calculates an amount of refrigerant remaining in the refrigerant circuit using at least a rotational speed of the compressor, a refrigerant discharge temperature of the compressor, a heat exchanger temperature, an opening degree of the expansion valve, and an outside air temperature, which are amounts indicating an operating state at the time of operation. The indoor heat exchanger has a sensor for detecting a temperature of refrigerant flowing through an indoor heat exchanger intermediate portion that connects a first indoor heat exchanger port portion and a second indoor heat exchanger port portion. The outdoor heat exchanger has an outdoor heat exchanger intermediate portion that connects a first outdoor heat exchanger port portion and a second outdoor heat exchanger port portion, and a sensor provided in the second outdoor heat exchanger port portion for detecting a temperature of refrigerant flowing from an outdoor heat exchanger outlet of the second outdoor heat exchanger port portion at the time of refrigeration operation. The present invention provides an air conditioner that can calculate the amount of refrigerant remaining even when only limited sensors are provided.

The utility model provides a temperature control system of a continuous hot press, which relates to the technical field of hot presses and comprises an oil tank, a heater, a heat exchanger, a pressure die end, an electric cabinet, a temperature sensor and a circulating pump. The first end of the circulating pump is connected with the heater, and the second end is connected with the pressure mold end; the temperature sensor is arranged between the circulating pump and the heater; the electric control box is electrically connected with the heater, the heat exchanger, the temperature sensor and the circulating pump. According to the utility model, rapid heating and cooling of the hot press can be realized; the stability of the working temperature of the hot press is good; the heat exchange efficiency is high; it is guaranteed that the system works under the safe pressure, and meanwhile the function of emergency pressure relief when equipment leaks and breaks down is achieved.

The invention provides an air conditioner and a control method thereof.The air conditioner comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttling device and a heater, the compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger can be communicated to form a refrigeration circulation loop, and the air conditioner further comprises parallel branches; the parallel branches are arranged at the two ends of the throttling device in parallel, and the heater is arranged on the parallel branches so that the heater can be located between the outdoor heat exchanger and the indoor heat exchanger. When the outdoor heat exchanger defrosts, exhaust gas of the compressor is communicated with one end of the outdoor heat exchanger, the throttling device can be closed, and a refrigerant can flow through the heater to be heated and then enters the indoor heat exchanger. According to the air conditioner, the problems that in the prior art, the temperature of an indoor heat exchanger is too low in the defrosting period, flowing of lubricating oil in the heat exchanger is affected, and even oil blockage is caused can be solved.

The invention relates to an aircraft outer skin convective heat transfer coefficient ground test system based on an incubator, belongs to the technical field of aircraft heat dissipation, and aims to solve the problem that the existing method cannot accurately simulate the flight condition in a low-temperature and low-pressure environment and cannot measure and obtain the convective heat transfer coefficient of the aircraft outer skin in the low-temperature and low-pressure environment. An aircraft outer skin convective heat transfer coefficient ground test system based on an incubator comprises a low-temperature and low-pressure incubator, a centrifugal fan, a skin heat exchanger, a temperature collector, a circulating pump, a thermocouple and a simulation heat source. Different external flow fields of the skin heat exchanger are simulated on the ground through the wind speed generated by the centrifugal fan, different high-altitude low-temperature and low-pressure environments are simulated through the low-temperature and low-pressure incubator, and measurement of the convective heat transfer coefficient of the outer skin of the aircraft is completed on the ground.

The utility model provides gas-water separation equipment for an electrolytic bath, which comprises a dryer, a discharge pipe is arranged on the dryer, a flowmeter, a back pressure valve and a concentration detector are arranged on the discharge pipe, a gas-liquid separation mechanism is arranged on one side of the dryer, and the dryer is communicated with the gas-liquid separation mechanism through a pipeline a; an inlet pipe is arranged on the gas-liquid separation mechanism, and a plate heat exchanger, a temperature sensor and a pressure sensor are arranged on the inlet pipe; and the gas-liquid separation mechanism comprises a separation tank. Gas enters the fixing sleeve along the inlet pipe, flows out of the throwing-out pipe along the groove, the inlet groove and the liquid flowing groove, the rotating driving piece drives the driving wheel to rotate, the rotating wheel is driven by the belt to rotate, the moving rod and the throwing-out pipe are driven to rotate, a gas-water mixture is thrown out through centrifugal force, and the gas flows to the dryer through the pipeline a. Water is collected at the bottom of the separation tank, and the gas-water separation effect is enhanced through centrifugal force.

The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a dehumidification operation control method thereof. The method can perform backup dehumidification operation when a humidity sensor fails. During the backup dehumidification operation, a target shutdown state point in a dehumidification mode is determined based on changes in indoor ambient temperature, indoor heat exchanger temperature, and target humidity information set by a user. In addition, based on the characteristic that the higher the indoor humidity, the slower the indoor ambient temperature and indoor heat exchanger temperature drop, change data of the indoor ambient temperature and indoor heat exchanger temperature are collected during a data collection phase. The dehumidification load is indirectly inferred based on the collected data, thereby selecting conditions for stopping dehumidification without affecting the dehumidification operation of the air conditioner.

An air conditioner may include a heat exchanger temperature sensor, a compressor, at least one memory storing one or more instructions, and at least one processor, wherein the at least one processor is configured to execute the one or more instructions stored in the memory to calculate a dew point of a ceiling interior space where an indoor unit of the air conditioner is provided, obtain a surface temperature of the indoor unit based on a sensor value of the heat exchanger temperature sensor during operation of the air conditioner, and based on the obtained surface temperature of the indoor unit being lower than or equal to the dew point of the ceiling interior space, increase the surface temperature of the indoor unit by reducing a driving frequency of the compressor.

The present invention discloses a defrosting and cold air prevention control method for an air conditioner, an air conditioner, and a medium. The method comprises: upon receiving a command to enter defrost mode, shutting down the compressor; obtaining the current ambient temperature; determining a closing rate of an air deflector based on the ambient temperature, wherein the lower the ambient temperature, the higher the closing rate; controlling the air deflector to close at the closing rate; and, after the air deflector closes, turning on the compressor and performing defrost. This method solves the technical problem in the prior art of not implementing cold air prevention control during the initial residual heat blowing phase of an air conditioner defrosting, resulting in cold air blowing on the user. The method achieves the effect of cold air prevention control during the initial residual heat blowing phase of the defrosting phase.

The application discloses a cascade refrigeration system flow control method and device, a refrigeration equipment and a medium. The cascade refrigeration system comprises a low-temperature stage compressor, a high-temperature stage compressor, an intermediate heat exchanger, a temperature sensor, a condensing fan and a temperature drop rate sensor. The temperature sensor is arranged on the intermediate heat exchanger. The method comprises the following steps: when the low-temperature stage compressor is started, the real-time temperature monitored by the temperature sensor is synchronously acquired, and the running time length of the low-temperature stage compressor is recorded; the running state of the low-temperature stage compressor is determined according to the real-time temperature and the running time length; and if the low-temperature stage compressor is in a low-flow running state, a low-flow response mode is started. The temperature detected by the temperature sensor and the calculated instantaneous temperature drop rate are utilized to determine the flow condition when the low-temperature stage compressor is started, and the flow control is performed according to the instantaneous temperature drop rate, so that the problem that the refrigerant flow is low and the temperature drop rate is slow due to the liquid accumulation in the intermediate heat exchanger when the low-temperature stage compressor is started is solved.

To provide an air conditioner capable of surely detecting refrigerant leakage from a refrigerant circuit.SOLUTION: The control part 50 compares an initial detection temperature being a detection value in the heat exchange temperature sensor 40 immediately after the start of operation with a first detection temperature being a detection value in the heat exchange temperature sensor 40 after a predetermined time elapses from the start of operation, opens the bypass valve 36 when a predetermined first condition is satisfied, compares a second detection temperature being a detection value in the heat exchange temperature sensor 40 after a predetermined time elapses from the opening of the bypass valve 36 with the first detection temperature, and stops the operation when a predetermined second condition is satisfied. As a result, the occurrence of refrigerant leakage from the refrigerant circuit 30 can be accurately detected regardless of the temperature around the main body case 10. In addition, since the present invention can be implemented without installing an additional member such as a room temperature sensor, the cost of the product is not increased.SELECTED DRAWING: Figure 5

The utility model belongs to the technical field of sugar alcohol drying, and relates to a drying and aging system for sugar alcohol crystals, which comprises a drying cylinder for storing the sugar alcohol crystals, a feed port, a discharge port and an air outlet are respectively arranged on the drying cylinder, at least one layer of air inlet device is arranged on the lower portion of the drying cylinder, and the air inlet device is arranged on the lower portion of the drying cylinder. Each layer of air inlet device is provided with a plurality of air inlets communicated with the interior of the drying cylinder, each air inlet is communicated with an air outlet port of the rotary dehumidifier through an air inlet pipeline, an air feeder, a heat exchanger, a temperature sensor, a flow sensor and an air volume adjusting valve are sequentially arranged on the air inlet pipeline, and an exhaust outlet is communicated with an exhaust pipeline. And an induced draft fan and a humidity sensor are respectively arranged on the exhaust pipeline. The drying cylinder is simple in structure and easy and convenient to operate, sugar alcohol crystals can be directly aged in the drying cylinder after being dried, the fluidity of the aged sugar alcohol crystals is good, the caking risk can be effectively reduced, and in addition, the storage space is saved.

The invention discloses a heat exchanger temperature segmented cascade control method and system, and the system comprises a gas flow path located on the hot side of a heat exchanger unit, and a first cooling medium flow path and a second cooling medium flow path which are located on the cold side of the heat exchanger unit. The system further comprises a temperature measuring device, a flow detecting and adjusting device, a first cascade control loop, a second cascade control loop, a temperature interval judging module and a control loop switching module. According to the method, the gas outlet temperature target value and the first cooling medium outlet temperature target interval are set, the gas outlet temperature, the first cooling medium outlet temperature and the mass flow of two paths of cooling media are collected in real time, and the temperature difference range parameter is calculated based on the relation between the first cooling medium outlet temperature and the target interval and the temperature difference range parameter. The first cascade control loop or the second cascade control loop is selected in a segmented mode to be in an active adjusting state, double-target decoupling and cooperative control over the gas outlet temperature and the first cooling medium outlet temperature are achieved, and the operation safety of a compressor and the cooling medium waste heat utilization efficiency are both considered.

The temperature control system comprises an upper-layer heat exchanger and a lower-layer heat exchanger, the upper portion of a heat pipe is arranged in the upper-layer heat exchanger, the lower portion of the heat pipe is arranged in the lower-layer heat exchanger, and a medium C in the heat pipe is communicated to a balance tank through a vapor-phase balance pipe and a liquid-phase balance pipe. The energy accumulator communicates with the upper portion of the balance tank through a pipeline and is provided with a pressure adjusting device used for dynamically adjusting system pressure to control the evaporation temperature of the medium C. The system is simple in structure, convenient to use and capable of adjusting the system pressure in a self-adaptive mode, so that the evaporation temperature of the medium C is always higher than the freezing temperature of the working medium B, and the working medium B cannot be frozen in the heat exchange process; the temperature control precision is high, the response is fast, the system stability is high, the safety and the heat exchange efficiency of the system are improved, and high practical value is achieved in industrial application.

The invention provides a carbon deposition cleaning control method and a parking heater, and the method comprises the steps: obtaining the operation data of the parking heater; the operation data comprises at least one of the following items: the temperature of a heat exchanger of the parking heater, the temperature of tail gas, the resistance value of an ignition plug in the parking heater, the operation duration of the parking heater at each operation gear, the starting times of the parking heater and the ignition failure times of the parking heater; comparing the operation data with a preset threshold value corresponding to the operation data, and determining whether to execute a carbon deposition cleaning operation or not; and in response to the fact that the carbon deposition cleaning operation is determined to be executed, the rotating speed of a draught fan in the parking heater is increased to the preset rotating speed, and / or the oil pumping frequency of the parking heater is increased to the preset frequency.

A chiller system capable of controlling the temperature of a heat exchanger without tuning, according to an embodiment of the present invention, comprises: a reservoir tank storing a fluid recovered from a semiconductor facility; a recovery line through which the recovered fluid is stored in the reservoir tank; a supply line through which the stored fluid is supplied to the semiconductor facility; a pump pumping the fluid to the semiconductor facility; and a heat exchanger temperature control system including a heat exchanger and a heat exchanger temperature control unit.

The utility model relates to an ethylene oxide feeding device which comprises a reaction kettle, a feeding device communicated with a feeding port of the reaction kettle and a first heat exchanger arranged between the feeding device and the feeding port, and the first heat exchanger is connected with a heat exchange system. The first heat exchanger does not need to be subjected to heat exchange by heat generated by the reaction kettle, so that the temperature of the first heat exchanger can be accurately controlled, the temperature of ethylene oxide entering the reaction kettle is relatively high and is in a vaporized state, the temperature of reaction fog drops of the ethylene oxide reaches the addition reaction temperature, and the addition reaction efficiency of the ethylene oxide is improved.

The invention relates to the technical field of temperature control, and discloses a heat exchanger automatic cooling circulation control method and system based on the Internet of Things. Firstly, a heat exchanger related parameter data set is obtained, and a heat exchanger automatic cooling circulation control model is established; secondly, establishing a BP neural network, and searching an initial weight of the BP neural network by using an improved red-mouth blue-magpie optimization algorithm to obtain a globally optimal solution; using the globally optimal solution as an initial weight of a BP neural network, training PID control parameters by using a PID control algorithm to obtain optimized PID control parameters, and completing cooling circulation cooling control in combination with an automatic cooling circulation control model of the heat exchanger; and finally, training to obtain a GRU neural network early warning model, outputting a temperature early warning value of the heat exchanger, and realizing temperature control early warning of the heat exchanger. By designing the heat exchanger automatic cooling circulation control system, the purpose of heat exchanger automatic cooling circulation control is achieved, and the method is accurate and objective.

The application discloses an air conditioner and a control method thereof, a storage medium, and an electronic device and a control device, and the control method comprises the following steps: acquiring operation parameters of the air conditioner, wherein the operation parameters comprise an indoor side wind speed of the air conditioner, and a temperature difference between an indoor side inlet air temperature and an indoor side heat exchanger temperature of the air conditioner; acquiring outdoor side parameters of the air conditioner, wherein the outdoor side parameters comprise an outdoor temperature; and adjusting a compressor operation frequency of the air conditioner according to the operation parameters and the outdoor side parameters. The application can select a suitable compressor operation frequency, avoid a temperature of an electric control connected with the compressor being too high, reduce a failure rate, and prolong a service life of the air conditioner.

The invention provides an air conditioner defrosting misjudgment restraining method, a control device and an air conditioner, and relates to the technical field of air conditioners. The air conditioner defrosting misjudgment restraining method comprises the steps that the outdoor environment temperature, the outdoor unit heat exchanger temperature and the temperature difference between the outdoor environment temperature and the outdoor unit heat exchanger temperature are obtained; judging whether the outdoor environment temperature and the temperature difference meet a preset defrosting condition for the first time or not; if yes, whether a defrosting mode is started or not is determined according to preset judgment factors, and the preset judgment factors comprise the temperature change value of the temperature of the outdoor unit heat exchanger within the first preset time. By means of the air conditioner defrosting misjudgment restraining method, air conditioner defrosting misjudgment can be effectively restrained, the judgment accuracy of the air conditioner entering the defrosting mode is improved, extra energy consumption caused by invalid defrosting, indoor temperature fluctuation caused by mistaken defrosting and frequent starting and stopping of a compressor caused by mistaken defrosting are reduced, and the air conditioner defrosting misjudgment restraining method is suitable for popularization and application. And the air conditioner heating APF and the user comfort are correspondingly improved, and the service life of the compressor is prolonged.

The invention discloses a heat exchanger temperature and pressure alternating fatigue coupling test platform and a test method thereof. The test platform is formed by coupling a temperature alternating system and a pressure alternating system, wherein the temperature alternating system is composed of a high-temperature medium circulating system and a low-temperature medium circulating system. Wherein the high-temperature medium circulating system comprises a hot oil tank (1), a shield pump A (5), a shield pump C (7), a stable-temperature heater (13) and a circulating heater (15); the low-temperature medium circulating system comprises a cold oil tank (2), a shield pump B6, a shield pump D8, a stable-temperature cooler (14) and a water cooling unit (16); the pressure alternating system comprises a hot oil tank (1), a cold oil tank (2), a pneumatic plunger pump (21) and a screw compressor (23). The temperature and pressure alternating environment of the heat exchanger in the actual working process can be simulated, the fatigue life of the heat exchanger is evaluated, and therefore the reliability and safety of the heat exchanger are improved.