253 results about "Condensation temperature" patented technology

The invention provides an anti-condensation temperature and humidity regulation and control system and method for remote deep learning prediction aided decision making, and the method is characterized in that a field controller is connected with a temperature and humidity collection device, obtains the environment temperature and humidity, calculates the dew point temperature, obtains the surface temperature of a protected part, and starts and stops a heating and / or dehumidification device by comparing the difference between the two values with a preset threshold value; the temperature and humidity acquisition device acquires field environment temperature and humidity data for the field controller to calculate the dew point temperature, and the temperature and humidity acquisition device is also used for acquiring the surface temperature of the protected part; the heating device is used for raising environment temperature; the dehumidification device is used for reducing the environment humidity; the communication module is used for data transmission between the field controller and the remote prediction terminal, sending field data and receiving prediction information; the remote prediction terminal obtains field data through the communication module; an anti-condensation system structure combining local autonomous control and remote prediction assistance is established, and redundancy fault-tolerant capability is achieved; even if the remote prediction function fails, the field control can still operate independently and reliably.

A method and system for modulating vapor and liquid fractions of a cycling liquid-vapor fluid operating within its phase transition envelope by creating forced oscillating heat transfer between liquid and vapor fractions of the cycling stream. A liquid stream segment is expansion cooled and brought into thermal communication with a vapor stream segment. The contact with the expansion-cooled liquid enables intermolecular forces to drive condensation and release condensation heat at a condensation temperature higher than the temperature of the expansion-cooled stream segment. The resulting temperature gradient enables the expansion-cooled segment held at constant volume to capture the condensation heat and isochorically vaporize into a vapor stream segment that again is forced to condense so as to form an oscillating thermal cycle within the cycling liquid-vapor fluid.

The invention provides a cooling system, a cooling method and a heat pump unit. The cooling system comprises a cooler, an oil circulation loop, a first motor cooling loop, a second motor cooling loop and a refrigerant purifier. Supplementary water enters the cooler to cool a heat exchange coil in the cooler, the heat exchange coil is connected into an oil circulation loop and a first motor cooling loop, and the oil circulation loop is used for circularly conveying lubricating oil to cool a compressor bearing. The first motor cooling loop is used for conveying a liquid refrigerant to cool a compressor motor; the supplemented water in the cooler continuously enters the refrigerant purifier and is used for condensing the refrigerant and separating non-condensable gas in the refrigerant; and the second motor cooling loop is connected with the refrigerant purifier and is used for conveying a refrigerant to cool the compressor motor. By arranging the cooling system, the problem that the high-temperature heat pump is not suitable for a conventional cooling system due to too high condensation temperature is solved, the heat exchange effect of the unit is guaranteed, and the reliability of the unit is improved.

The utility model discloses a gas conveying device and process equipment of a semiconductor device. The device comprises a first group of gas paths, the gas inlet end of which is connected with a carrier gas source and a TEOS (tetraethyl orthosilicate) source and is used for transmitting a first group of gas comprising carrier gas and TEOS; the gas inlet end of the second group of gas paths is connected with a supplementary gas source, and a second group of gas including supplementary gas is transmitted; the gas inlet end of the third group of gas paths is connected with the ozone source and transmits a third group of gas containing ozone; the gas inlet ends of the gas mixing parts are respectively connected with the gas outlet ends of the first group of gas paths, the second group of gas paths and the third group of gas paths, so that the first group of gas, the second group of gas and the third group of gas in equal proportion are obtained and mixed, and the mixed gas is averagely distributed to the corresponding treatment stations in the reaction cavity from the gas outlet ends of the gas mixing parts for a deposition process. According to the utility model, the distribution uniformity of a plurality of groups of process gases can be improved, so that the film thickness difference of each treatment station is reduced, the condensation temperature of TEOS (tetraethyl orthosilicate) can be improved, and the film particle pollution is improved.

The invention discloses an industrial dangerous waste liquid treatment whole-process intelligent control method and system based on digital twinning, and relates to the technical field of intelligent control, and the method can recognize the sudden change trend of a liquid level and bubbles in real time through a tension field twinning mapping prediction model and the calculation of a bubble form volatilization unsteady state index. Based on a standard data set collected in real time, when the liquid level has an abnormal sudden change trend, early warning can be performed in advance, and a linkage control strategy is automatically triggered. For example, when the liquid level sudden change pre-judgment index R exceeds a safety threshold value, bubble evaporation twinborn prediction is automatically triggered, and control means such as stirring speed reduction and condensation temperature adjustment are executed. According to the intelligent control based on digital twinning and twinning feedback, the reaction environment in the waste liquid treatment process can be accurately controlled, the risk that the reaction is out of control is greatly reduced, lagging reaction and misoperation in a traditional method are avoided, and continuous and stable reaction process is ensured.

The invention discloses a large-scale cruise ship water chilling unit pipe network cold storage intelligent energy-saving control method based on double-layer deep reinforcement learning, which comprises the following steps: 1, carrying out inherent cold storage engineering modeling on a chilled water pipe network of a water chilling unit to obtain an energy balance relationship between equivalent cold storage capacity and cold release sustainable time of the pipe network and bearable cold capacity; the relationship is used as a physical prior to introduce strategy learning and a security boundary; 2, constructing a double-layer deep reinforcement learning architecture; 3, a safety layer is additionally arranged in the double-layer deep reinforcement learning architecture, the safety layer cuts and projects output feasible regions of a target layer and a sublayer through a hard constraint and barrier mechanism, the water supply temperature, the temperature difference, the start-stop interval, the condensation temperature and the power change rate are ensured, and the maritime affair safety requirement is met; and 4, on the basis of a pipe network inherent cold storage model, a double-layer deep reinforcement learning framework and a safety layer, peak load shifting control of low-load cold charging-high-load cold discharging is achieved, and unit cold energy consumption of the water chilling unit is reduced.

The invention discloses a precise temperature controller and a dynamic control method thereof.The precise temperature controller comprises a refrigerating unit, a precise temperature control unit and a multi-parameter decoupling controller, and a cooling water outlet of an evaporator in the refrigerating unit, the precise temperature control unit and a cooling water inlet of the evaporator are connected in a circulating mode; the precise temperature control unit comprises an auxiliary water tank, a main water tank, a constant-temperature water tank, an electromagnetic valve, an electric heater, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a refrigerating unit. The electric heater of the precise temperature control unit, the control end of the electromagnetic valve, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all connected with the parameter decoupling controller. The Smith predictor and the fuzzy PID are coupled for control, the rotating speed of the compressor and the opening degree of the electronic expansion valve are adjusted and corrected, condensation temperature dynamic optimization and water temperature fine adjustment control are combined, and the method has the advantages of being high in precision, quick in response and high in robustness.

The invention discloses a condensation pressure reference control method and device for an ammonia absorption type refrigeration system. The method comprises the following steps: establishing an absolute physical reference, namely a target condensing pressure, determined by ammonia physical properties, wherein the value is uniquely determined at a given condensing temperature; the condensing pressure is detected in real time; and with approaching as a target, working condition parameters of the ammonia purification device are adjusted, so that the purity of ammonia vapor entering the evaporator is close to 100%. The device is an electronic control or self-operated machine. According to the method, the condensing pressure is increased to be an active physical reference based on the double-rigidity constraint of fixed ammonia charge and determined condensing pressure, so that the system automatically approaches to a theoretical optimal state in a wide temperature range, the rectification fault risks such as tower flooding and tower flushing are remarkably reduced, the energy efficiency is improved, and the method is suitable for industrial waste heat recovery, refrigeration houses and other scenes.

The invention relates to the technical field of seawater bromine extraction production, and discloses a seawater bromine extraction production line digital management method and system, and the method comprises the steps: collecting and integrating meteorological ocean data, raw material seawater real-time components, a process sensor network and equipment state data in real time, and forming a four-dimensional data set; constructing the four-dimensional data set into a graph structure, excavating a nonlinear coupling relationship among seawater characteristics, process parameters and equipment efficiency based on the graph structure, establishing a coupling analysis model, and pre-judging a fluctuation condition through the coupling analysis model; the condensation temperature and the tail gas bromine concentration are monitored in real time, and a multi-layer LSTM network model is adopted to predict the optimal value of the steam consumption; constructing a digital twinborn model of the production line, and simulating and predicting the production process in the digital twinborn body by using a model prediction control algorithm to obtain a predicted production result; when the deviation between the predicted production result and the actual production data exceeds a set threshold value, a DQN algorithm is adopted for intelligent regulation and control; according to the invention, the efficiency and precision of production management are improved.

The invention relates to the field of engine intake and exhaust system control, in particular to an EGR system control method, a vehicle, electronic equipment and a storage medium. The EGR system comprises an EGR waste gas temperature adjusting unit and an EGR valve, wherein the EGR waste gas temperature adjusting unit is connected with the EGR valve through a pipeline; the EGR system control method comprises the steps that the condensation temperature threshold value of temperature-adjusted waste gas is obtained, and the temperature-adjusted waste gas is waste gas exhausted by an engine with the temperature adjusted through an EGR waste gas temperature adjusting unit; determining the condensation risk degree of the temperature-adjusted waste gas based on the condensation temperature threshold value and the temperature of the temperature-adjusted waste gas; if the condensation risk degree belongs to the first condensation risk grade, the cooling degree of waste gas exhausted by the engine is lowered through an EGR waste gas temperature adjusting unit; if the condensation risk degree belongs to a second condensation risk level, the opening degree of the EGR valve is controlled to be reduced; wherein the second condensation risk grade is higher than the first condensation risk grade. According to the method, generation of condensate water can be accurately prevented, and the high EGR rate is guaranteed as much as possible.

The invention belongs to the technical field of heat pump system modeling, and particularly relates to a heat pump modeling method based on black box model and white box model coupling, which comprises the following steps: inputting structure parameters, working condition parameters and setting parameters of a heat pump system; determining an initial population of the evaporation temperature and the condensation temperature based on a meta-heuristic intelligent algorithm; determining state parameters of the working medium at different temperatures and pressures; calculating the heat exchange area of the heat exchanger based on a white box model and black box model coupled hybrid model; whether convergence conditions are met or not is judged, and if the convergence conditions are not met, evaporation temperature and condensation temperature populations are regenerated through an intelligent solver based on a meta-heuristic algorithm; if the convergence condition is met, a calculation result is output, and calculation of the heat pump system performance is completed. By coupling the black box model and the white box model, the prediction precision of the heat pump system is remarkably improved.

The application discloses a kind of switch cabinet purification method, system, device, storage medium and computer equipment.The method comprises: obtaining the environmental information of all grid spaces pre-divided in switch cabinet, wherein each grid space has the same spatial complexity;Based on the environmental information of each grid space, determine the condensation temperature threshold and particulate matter deposition threshold corresponding to each grid space, and monitor the temperature information and particulate matter concentration information of each grid space;Determine whether the temperature information of each grid space is less than or equal to the condensation temperature threshold corresponding to the grid space, and whether the particulate matter concentration information is greater than or equal to the particulate matter deposition threshold corresponding to the grid space;If the temperature information is less than or equal to the condensation temperature threshold and / or the particulate matter concentration information is greater than or equal to the particulate matter deposition threshold, then perform environmental purification work on the switch cabinet.The above method can greatly improve the environmental purification effect of switch cabinet.

The invention provides a thermal management system and method for automobile exhaust gas recirculation and an automobile, the thermal management system comprises a heat exchanger, a first pipeline, a second pipeline and a regulating pipeline group, the heat exchanger is provided with a first port and a second port, the first pipeline is provided with a first multi-way valve, the first port is communicated with a first interface of the first multi-way valve, the second pipeline is provided with a second multi-way valve, and the regulating pipeline group is communicated with a second interface of the second multi-way valve. The second port is communicated with the first interface of the second multi-way valve, and the adjusting pipeline group is respectively communicated with the first multi-way valve and the second multi-way valve; according to the technical scheme, the heat exchanger at least has the beneficial effects that by arranging the adjusting pipeline set, the liquid inlet direction of the heat exchanger can be adjusted, so that the heat exchange efficiency is adjusted, the liquid inlet direction in the heat exchanger is adjusted to be reverse under the condition that the temperature is extremely low, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. The heat exchange efficiency of the heat exchanger is reduced, the waste gas condensation temperature is further reduced, and the use temperature range of the waste gas recirculation system is enlarged.

The invention discloses an operation control method of a heating and ventilation system, the heating and ventilation system and related equipment. The heating and ventilation system comprises a heat source unit, a heat storage module and a control unit. Wherein the heat storage module is provided with a phase change material and at least one temperature sensor, and the heat source unit is connected with the heat storage module through an energy charging flow path. The control unit determines the target condensation temperature of the heat source unit based on the temperature, detected by the temperature sensor, of the phase change material when the heat storage module is charged; and controlling the compressor frequency of the heat source unit based on the target condensation temperature. In this way, the system can effectively improve the operation efficiency and the energy utilization rate, and meanwhile the stability and reliability of the system are ensured.

A heat pump system according to an aspect of the disclosed invention may include: a compressor for compressing a refrigerant; a refrigerant-water heat exchanger performing heat exchange between the compressed refrigerant and the introduced water; an expansion valve for expanding the refrigerant condensed in the refrigerant-water heat exchanger; an outdoor heat exchanger performing heat exchange between the refrigerant expanded by the expansion valve and outdoor air; a high-pressure sensor for sensing a high-pressure saturation temperature of the refrigerant compressed in the compressor; the water inlet temperature sensor is used for sensing the temperature of water entering the refrigerant-water heat exchanger; the condensation temperature sensor is used for sensing the temperature of the refrigerant condensed in the refrigerant-water heat exchanger; the outdoor temperature sensor is used for sensing the outdoor temperature; the control component determines the reference supercooling degree of the refrigerant based on the sensing results of the outdoor temperature sensor and the water inlet temperature sensor and the operation frequency of the compressor, determines the current supercooling degree of the refrigerant based on the sensing results of the high pressure sensor and the condensation temperature sensor, and compares the reference supercooling degree with the current supercooling degree. To determine whether there is a refrigerant leak.

The application provides a compressor performance test system and a test method thereof, wherein the compressor performance test system comprises a to-be-tested compressor, at least two condensers, at least two calorimeters and a control unit, a temperature sensor, a pressure sensor and an electronic expansion valve are arranged between the inlet of the calorimeter and the outlet of the condenser, and the outlet of the calorimeter and the liquid reservoir are spaced apart to arrange the pressure sensor and the temperature sensor. In the compressor performance test system and the test method thereof provided in the application, two or more sets of calorimeter systems are used to simultaneously obtain refrigerating capacity of two or more evaporation sides and heating capacity of two or more condensation sides, so as to meet the performance test requirements of the compressor with multiple evaporation temperatures and multiple condensation temperatures.

The invention relates to a refrigerating system control method and device, computer equipment and a computer readable storage medium, and the method comprises the steps that in the operation stage of a refrigerating system, the target frequency of an inverter compressor is obtained according to the required refrigerating capacity of a secondary refrigerant side and the target condensation temperature and target evaporation temperature of a refrigerant side; controlling the inverter compressor to output by taking the target frequency as the current frequency, and running for a first preset duration; and when the current frequency is within the upper and lower limit range of the target frequency, the current frequency of the inverter compressor is adjusted based on the relation between the actual liquid supply temperature flowing to the evaporator from the refrigerant side and the target liquid supply temperature. The actual liquid supply temperature is close to the target liquid supply temperature so as to guarantee the temperature control effect, meanwhile, the inverter compressor can operate at the frequency matched with the temperature control working condition, the inverter compressor is prevented from operating at the high frequency all the time, power consumption of a refrigerating system and a heating system is reduced, meanwhile, temperature control through excessive dependence on the heating system can be avoided, and the energy consumption of the refrigerating system and the heating system is reduced. And the temperature control effect is ensured.

The present disclosure provides methods and systems for producing a C4+ compound, including the steps of: (i) reacting a feed stream comprising C1+O1-3 hydrocarbons in the presence of an acid condensation (AC) catalyst at a condensation temperature and condensation pressure to produce an AC product stream including the C4+ compound; (ii) fractionating AC product stream into an AC liquid product stream including organic products and a vapor stream; (iii) fractionating the AC liquid product stream by a fractionation column into a liquid C4+ compound product stream and a gaseous overhead stream; (iv) cooling the gaseous overhead stream to produce a liquid reflux stream and a gaseous vent stream; (v) recycling a first portion of the liquid reflux stream to the fractionation column for the fractionation in step (iii); and (vi) recycling a second portion of the liquid reflux stream to the feed stream for the reaction in step (i).

The invention discloses an intelligent positive displacement condensing unit controller which comprises a main control unit, a multi-mode sensing module, an actuator driving unit, a communication center, a self-adaptive power management system, a human-computer interaction interface and a fault prediction and health management module. The system has the advantages that all-parameter real-time monitoring can be achieved, and 12 key parameters including the exhaust temperature, the back air temperature, the environment temperature, the air outlet temperature, the condensate temperature, the evaporation temperature, the condensation temperature, the refrigeration house temperature, the compressor current / frequency, the fan rotating speed and the like can be covered; based on a fuzzy PID algorithm and a machine learning model, operation parameters are dynamically adjusted, and manual debugging is omitted; electric heating is replaced by hot gas bypass defrosting, and'defrosting with frost and no defrosting without frost 'is realized in combination with a self-learning algorithm; the requirements of the refrigeration house at the temperature ranging from-40 DEG C to + 15 DEG C are automatically recognized, and a single controller adapts to high / medium / low temperature working conditions.

The invention discloses a device for separating low-boiling-point substances in white spirit based on pneumatic reflux. The device comprises a gas source, a separation tank, a condensation assembly and a reflux assembly, the air source is communicated with the separation tank, the separation tank is provided with an air outlet hole matched with the condensation assembly, and the condensation assembly is communicated with the separation tank through the air outlet hole; multiple stages of condensation parts with different condensation temperatures are arranged on the condensation assembly, each stage of condensation part is communicated with the separation tank through a reflux assembly, and at least one group of recoverers is arranged in the reflux assembly.

The invention provides an evaporative cooling air conditioner control system for energy-saving operation of a low-condensation-temperature compressor, and relates to the technical field of automatic control, and the evaporative cooling air conditioner control system comprises an acquisition module which is used for acquiring the dry-bulb temperature and the wet-bulb temperature of outdoor air and the indoor return air temperature and the air supply temperature in real time, and calculating the heat transfer efficiency of a current air heat exchanger according to indoor and outdoor parameters; the judgment module is used for judging whether the current operation condition meets the operation condition of the indirect evaporative cooling mode or not according to the heat transfer efficiency and by combining the outdoor wet bulb temperature and the indoor set air supply temperature, and a judgment result is obtained; the control module is used for prohibiting starting of the compressor and utilizing a natural cold source if the judgment result meets the indirect evaporative cooling mode condition; and if the judgment result shows that indirect evaporative cooling cannot meet the refrigeration requirement, the compressor is allowed to be started, and mechanical cold supplementing is conducted. The energy consumption is effectively reduced, the refrigeration efficiency is improved, and energy-saving and efficient operation is achieved.

The utility model relates to a first-class lithium bromide absorption heat pump unit for preparing a high-temperature heat source. Comprising a generator A, a condenser A, a generator B, a condenser B, an evaporator A, an absorber A, an evaporator B, an absorber B, a heat exchanger A, a heat exchanger B, a solution pump A, a refrigerant pump A, a solution pump B, a refrigerant pump B, an internal circulation water pump, an internal circulation medium-temperature hot water system, pipelines, valves and the like, recycled low-temperature waste heat source heat is transferred to internal circulation medium-temperature hot water through the evaporator A and the absorber A. The internal circulation medium-temperature hot water enables the evaporation temperature of the evaporator B to be increased and the absorption pressure to be increased, so that the absorber B produces a high-temperature heat source. The generator and the condenser adopt independent cylinders, the pressure bearing capacity and the thermal displacement capacity of the unit are improved, the generating pressure and the condensing temperature are increased, and a high-temperature heat source can be produced. The unit expands the application field, realizes single-machine ultra-large type, reduces the total investment, and improves the comprehensive utilization rate of energy.

The invention discloses a composite working medium condensation and separation device for a semi-closed S-CO2 power cycle system, relates to the technical field of composite working medium condensation and separation, and solves the problem of separation of gaseous water in a CO2 working medium. The device comprises a composite working medium inlet drain pipe box, a circulating water shell and a working medium outlet pipe box which are vertically arranged and sequentially connected, wherein a spiral heat exchange pipe bundle is arranged in the circulating water shell; the composite working medium inlet drain pipe box, the spiral heat exchange pipe bundle and the working medium outlet pipe box are sequentially communicated; the composite working medium inlet drain pipe box is provided with a composite working medium inlet connecting pipe and a drain outlet connecting pipe; a water supply inlet connecting pipe and a water supply outlet connecting pipe are arranged on the circulating water shell; a working medium outlet connecting pipe and a starting exhaust port connecting pipe are arranged on the working medium outlet pipe box, and a wire mesh demister is arranged in the working medium outlet pipe box. According to the invention, through the coiled tube type heat exchanger, circulating water is adopted as a cold source to cool and condense the composite working medium, and based on the condensation temperature difference of CO2 and H2O, efficient separation of two components of CO2 and H2O is completed.

The invention relates to a dynamic method for maintaining a predetermined supercooling of the refrigerant exiting the condenser by means of dynamically controlling the circulating mass of the refrigerant by transferring refrigerant into or to a reservoir installed in parallel with the connection between the condenser and the regulator depending on the temperature difference between the condensation temperature of the saturating liquid and the outlet temperature of the condenser.

The application discloses a method for determining the condensation temperature of nitrogen under low vacuum pressure, in which, in one test, the total pressure at the inlet of a nozzle is kept unchanged through pressure control, the total temperature at the inlet of the nozzle is first adjusted to a higher total temperature through temperature control, and then the total temperature at the inlet of the nozzle is gradually reduced according to certain temperature intervals, the total pressure at the inlet of the nozzle, the total temperature at the inlet of the nozzle and the pitot pressure at the outlet of the nozzle are monitored in real time during the operation of the wind tunnel, and the condensation temperature of nitrogen under low vacuum pressure is determined through comprehensive analysis of the above data. The method can accurately determine the condensation temperature of nitrogen under low vacuum pressure, and makes up for the deficiencies of the theoretical formula and the traditional test acquisition method. The result can be used to reasonably determine the total temperature of a hypersonic low-density wind tunnel, which can not only reduce the design difficulty of the heater itself, but also reduce the overall energy supporting scale of the wind tunnel.

A method for determining an optimal condensing temperature of a refrigerant being used in a compressor-condenser-arrangement is presented, comprising the following steps: determining an actual operating condition of the compressor-condenser-arrangement; determining base-values of compressor-operation; determining base-values of condenser-fan-operation; determining an actual value of compressor-operation and calibrating the base-values of compressor-operation, and / or determining an actual value of condenser-operation and calibrating the base-values of condenser- fan-operation; determining a total power and determining the operating condition of the compressor-condenser-arrangement for which the total power is minimized and determining the condensing temperature for this operating condition as the optimal condensing temperature. Furthermore, an apparatus adapted to carry out the method and an according computer program are described.

The invention belongs to the technical field of condensation collection devices, and particularly relates to a condensate collection system and method with expiration and environment sampling functions, and the system comprises an air inlet unit, an air outlet unit, a flow rate monitoring unit, a temperature monitoring unit, a condensate collection unit and a power control unit; the air inlet unit comprises an air inlet pipe, a one-way valve and an air pump, an air outlet of the air inlet pipe is connected with the condensate collecting unit, and the air pump is used for exhausting air in an environment sampling mode; the gas outlet unit is used for discharging condensed gas from the condensate collecting unit; the flow rate monitoring unit is used for monitoring the air inlet flow rate in real time; the temperature monitoring unit is used for monitoring the condensation temperature in real time; the condensate collecting unit comprises a refrigerating module and a condensate collecting bottle, and the refrigerating module is used for refrigerating the condensate collecting bottle; the power control unit is used for regulating and controlling the refrigeration power of the refrigeration module according to the air inlet flow speed and the condensation temperature. The system is comprehensive in function, and refrigeration energy efficiency is improved through feedforward-feedback control.

The invention discloses an air conditioner and a control method thereof, and belongs to the technical field of air treatment. The air conditioner comprises a shell provided with a side air return opening and a lower air return opening; when the air port cover plate covers the lower air return port, the air inlet form of the air conditioner is side air return; when the air port cover plate covers the side air return port, the air inlet form of the air conditioner is lower air return; the control method comprises the steps that in a refrigeration mode, a fan is controlled to operate according to the side return air speed, and the actual evaporation temperature is obtained; if the actual evaporation temperature is smaller than the preset evaporation temperature, a lower return air inlet form is recognized, and a fan is controlled to operate according to the lower return air speed; otherwise, a side air return air inlet mode is adopted; in the heating mode, a fan is controlled to operate according to the side return air speed, and the actual condensation temperature is obtained; if the actual condensation temperature is larger than the preset condensation temperature, a lower air return air inlet form is recognized; wherein under the same wind gear, the lower air return speed is lower than the side air return speed. According to the air conditioner and the control method, noise generated during air return can be reduced.

The utility model discloses a sectional type fraction extraction device which comprises a base, a support is fixedly installed on the base, a rectifying column is fixedly installed on the support, the bottom of the rectifying column is fixedly communicated with an evaporator, the top of the rectifying column is fixedly communicated with an air condenser, and the air condenser is fixedly communicated with an evaporator. And the right side of the air condenser fixedly communicates with a condensed water condenser. The condensation water condenser, the control assembly and the condensation assembly are arranged, the control assembly controls the condensation temperature by adjusting the temperature and the flow speed of the condensation water, so that multi-stage condensation and backflow of steam in the condensation water condenser are achieved, condensation and backflow of MMPA materials are achieved, the condensation efficiency and the operation flexibility of the device are improved, and the energy consumption is reduced. The multi-stage condensation and backflow device has the advantages that the multi-stage condensation and backflow of the material are realized, impurities with different boiling points are separated, and the purity of the MMPA product can be obviously improved.

The application provides a control method for a heat pump system and the heat pump system, and comprises a compressor, a hot water heat exchanger, an outdoor air heat exchanger, a cold water heat exchanger and a gas-liquid separator which are connected by a circulating pipeline assembly, and the circulating pipeline assembly comprises an output pipeline, a first input pipeline, a second input pipeline and a third input pipeline; wherein a first pipeline assembly arranged on the liquid side of the outdoor air heat exchanger is connected with a second pipeline assembly composed of the first input pipeline and the output pipeline and a third pipeline assembly composed of the second input pipeline and the third input pipeline; the technical problem solved by the application is that in the existing heat pump system, the maximum refrigerant medium is in the refrigeration main mode, after the refrigerant medium is filled into the heat pump system, in other refrigeration modes, heating modes and heating main modes, the excessive refrigerant liquid is retained in the condenser, which causes the refrigerant medium to be over-cooled too much, the condensation temperature of the refrigerant medium is increased, and thus the heat exchange effect of the heat pump system is affected.