135results about How to "Solve frosting" patented technology

The invention provides an air conditioner control method which comprises the steps of under a dehumidification mode, detecting the temperature of a heat exchange pipe of the air conditioner; judging whether the temperature is greater than a first preset threshold value; when the temperature is greater than the first preset threshold value, controlling the air conditioner to run under a normal dehumidification mode; when the temperature is smaller than the first preset threshold value, increasing the temperature of the heat exchange pipe by adjusting the running frequency of a compressor of the air conditioner and / or the rotating speed of an indoor fan so as to ensure that the air conditioner runs under the dehumidification mode efficiently and stably. The invention also provides an adaptive dehumidification control system and an air conditioner.

The invention relates to an outdoor unit of a heat pump type air conditioner. The outdoor unit comprises a shell and a compressor, a heat exchanger and a fan system arranged in the shell. The shell is provided with a first air inlet and an air outlet, the air outlet is corresponding to the fan system, the first air inlet is corresponding to the heat exchanger. The invention is characterized in that: the outdoor unit also comprises a compressor waste heat collection device, the shell is also provided with a second air inlet on the position corresponding to the waste heat collection device; when the outdoor unit works, the waste heat collection device preheats the air which enters through the second air inlet and conveys the preheated air to a plenum box which covers outside the heat exchanger through a heating pipeline, so that the mixed air of the outside air from the first air inlet and the preheated air from the heating pipeline enters into an inner cavity of the plenum box. Compared with the prior art, the outdoor unit improves the air temperature of the heat exchanger so as to avoid frosting of the heat exchanger and overcome the defect that the prior air conditioner needs to close down twice to defrost the heat exchanger to affect the heating effect.

The invention discloses a heat exchanger integrally formed by a profiled micro-channel and an external corrugated fin. The heat exchanger comprises a fin group, an upper cover plate, a lower cover plate, a side plate, an air inlet and an air outlet; the fin group is connected in parallel by a plurality of fins; each fin is made of plate material; two sides of the fin is provided with a corrugated fin and the middle part of the fin is provided with a plurality of profiled micro-passage structures; the corrugated fin and the plate material are integrally formed; the upper cover plate and the lower cover plate are respectively provided with a trough which is used for arranging the fin; two adjacent troughs of the upper cover plate and the lower cover plate are communicated with each other intermittently, thus leading the refrigerant to flow through a plurality of fins sequentially; and the profiled micro-passage is a square passage with the side length of 0.8-1mm. The heat exchanger utilizes the micro-pore passage technology, integral external fin technology and no-welding refrigerant high-pressure sealing technology, is applicable to CO2 refrigeration systems, and effectively solves the problem of the high-pressure running of the system. The heat exchanger has compact structure, high heat-exchanging efficiency, small volume, light weight, is made of full-aluminium composite, and greatly reduces the cost.

The invention relates to a heat exchange device and a thermal management system. The device (40) is equipped in a thermal management system and includes a first heat exchanger (10) allowing a cooling fluid to pass, a second heat exchanger (36) allowing carried hot fluid to pass. The device (40) includes a heat storing member (M) for heat exchange with first and second heat exchangers (10, 36). The thermal management system (1) includes such a heat exchange device (40).

The invention provides a solar energy storage heat pump air conditioning system on the basis of solution. The invention is a new heat pump air conditioning system which performs the heat humidity independent processes in summer, absorbs the heat from the air with the help of the solution in winter, realizes the functions of cooling and heating and takes full advantages of the solar energy and is capable of storing the energy. The system comprises a solution part, a hot and cold water part and an air processing part and mainly comprises a hot and cold water machine set, a cooling tower, a dilute solution reservoir, a concentrated solution reservoir, a solution regenerator, a solar thermal collector, a dehumidifier, a superheater and a surface air cooler. When the heating mode is run in winter, the air source is taken as the heat quantity source of the heat pump on the basis of the solution, thereby thoroughly solving the frosting problem when the heating mode of the prior air source heat pump runs in winter, improving the performance coefficient of the heat pump; meanwhile, the solar energy is taken as the heat quantity source of the heat pump system, thereby realizing the solar energy storage on the basis of the solution and solving the unstable problem of the solar energy.

The invention discloses a full-vacuum horizontal liquefied natural gas (LNG) submerged pump pool. The full-vacuum horizontal LNG submerged pump pool comprises a pump pool body, a submerged pump pool and a support. A liquid outlet device which is arranged on the inner side of a pump pool cap is in a structure of high vacuum and heat insulation and an outer casing tube which is arranged on the outer side of the pump poop cap is fixedly connected with a vacuumized joint. The vacuumized joint is communicated with the liquid outlet device and the structure of high vacuum and heat insulation of the full-vacuum horizontal LNG submerged pump pool is formed by the vacuumized joint and a high-vacuum and heat-insulated interlayer between an outer cylinder and inner cylinder of the full-vacuum horizontal LNG submerged pump pool. According to this arrangement, all ways of heat leakage, such as convention, conduction and radiation can be eradicated so that good cold-insulated effect can be ensured. The rate of evaporation per day of LNG in the full-vacuum horizontal LNG submerged pump pool can be reduced by 21.5% to 31.5% compared with the vertical submerged pump pool in the prior art. The full-vacuum horizontal LNG submerged pump pool can be used for filling vehicles or transporting vehicle-mounted LNG, so as to greatly improve the economic benefit of LNG filling stations, LNG transportation and filling vehicles.

An air source solution-type heat pump device, which relates to a heat pump heating method based on the principle that the solution absorbs energy from the air and a device for implementing the method. The device comprises a coolant circulation loop and a solution circulation loop. The coolant circulation loop comprises a compressor, two solenoid valves, a regenerator, a four-way valve, a first heat exchanger, four one-way valves, a reservoir, a filter, an electronic expansion valve, a secondary heat exchanger, a gas-liquid separator and connecting tubes thereof. The solution circulation loop comprises a , a solution container, three manual valves, a frequency-variable pump, an electric three-way regulating valve, an regenerator, a second heat exchanger and connecting tubes thereof. The invention solves the problems that the water-cooling unit is not used in winter, the air source heat pump has poor refrigeration performance in summer (compared with the water-cooling unit) and has high risk of frost formation in winter. The device is a novel air source solution-type heat pump heating device capable of the water-cooling refrigeration in summer and the solution-based air heat absorption in winter.

The invention relates to a semi-open and heat-returning type air compression circulation heat pump water heater. The heat pump water heater comprises an air compressor, a heating water tank, a heat returning device and an air expansion machine. The air compressor is communicated with the air inlet end of the heating water tank, the heat returning device is communicated with the air outlet end of the heating water tank, the air outlet end of the heat returning device is directly communicated with the outside environment, a circulation loop is formed between the air expansion machine and the heat returning device in a communicated mode, and the air expansion machine and the air compressor are connected through a transmission coupler. Compared with the prior art, the heat pump water heater is designed based on the reverse Brayton cycle basic principle, a heat pump unit absorbs heat from the environment air in the compressing, heat releasing, expanding and heat absorbing processes and transmits the heat to high-temperature water. Air directly serves as cycle working fluid in the heat pump and is free of damage, pollution and preparing cost, a non-closed structure can be adopted in the using process, the cycle working fluid can be directly obtained from the environment through a cryogenic heat exchanger part, the leakage of the working fluid does not need to be taken into consideration, and the frosting problem under the low-temperature work condition does not exist.

The invention relates to a solar photovoltaic heat pump system, which comprises a solar photovoltaic electricity generation system, a recycle cooling system and a heat pump hot water system. A waterside inlet of an evaporator is connected with an inlet branch of a condenser through a branch, a fourth temperature control valve is arranged in the middle part, a cooler is pasted on the back of a photovoltaic component, an outlet of the cooler is respectively connected with a hot water storage tank and a constant-temperature water tank through a second temperature control valve and a first temperature control valve, a left side branch in the lower part of the hot water storage tank is connected with the cooler through a first recycle water pump, a right side branch in the upper part of the hot water storage tank is connected with the waterside inlet of the evaporator through a second recycle water pump and a third temperature control valve, an outlet of the evaporator is connected with the lower right side of the hot water storage tank through a pipe, the waterside inlet of the evaporator is connected with a third recycle water pump and the constant water tank in series through the pipe, a refrigeration loop of the evaporator is connected with a regenerator and is connected with an air entry and an exhaust outlet of a compressor through a liquid storage tank, and the inlet and the outlet of the condenser is connected with the evaporator entry through the regenerator and the electronic expansion valve.

The invention discloses an air source heat pump device with a solar hot water auxiliary defrosting function and a use method thereof. The device comprises a solar hot water system and an air source heat pump system, wherein the solar hot water system comprises a circulating water pump, a solar hot water drain pipe, a first cutoff valve, a solar heat collector, a heat storage water tank and a third cutoff valve, and the air source heat pump system comprises an evaporator, an expansion valve, a condenser, a four-way reversing valve and a compressor. The exterior of the original evaporator of the air source heat pump device is additionally provided with one row of heat exchange pipes, and hot water heated by solar energy flows in the heat exchange pipes. On one hand, the hot water is used for preheating the air, and on the other hand, a refrigerant pipeline is heated through the heat conduction of fins, so the evaporation temperature is raised to fundamentally avoid frosting. The air source heat pump device and the use method have the advantage that the evaporation temperature is raised to fundamentally avoid frosting; meanwhile, the efficiency and the working stability of the heat pump are improved, the electricity is saved, the environment-friendly and energy-saving effects are realized, and the like.

The invention discloses a low light level image intensifier test system which comprises a test box for containing the tested low light level image intensifier, a test power supply assembly for providing a working power supply to the tested low light level image intensifier, an illumination assembly for providing a test optical signal input to the tested low light level image intensifier, and a recording assembly for receiving an output optical signal generated by the tested low light level image intensifier based on the test optical signal input and converting the output optical signal into atest electrical signal and recording the voltage data of the test electrical signal. The illumination assembly comprises a light emitting device for emitting the test optical signal and a light guidedevice for transmitting the test optical signal; the test power supply assembly, the light emitting device and the recording assembly are all arranged outside the test box, the light guide device is arranged inside the test box and is used for transmitting the test light signal emitted by the light emitting device to the tested low light level image intensifier as the input of the test light signal.

The invention discloses a low temperature resistant fuel gas heat pump air-conditioning system combining awaste heat recovery mode and a liquid dehumidification mode. The system mainly comprises a gas engine (1), a compressor (2), a hot water waste heat recovery device (3), a four-way reversing valve (4), a heat exchanger (5), a throttling valve (6), a heat exchanger (7), a liquid storage tank (8), a solution heat exchanger (9), a preprocessor (10), a dehumidifier (11), a fan coil (12), an oil separator (13), a cooling water circulating pump (14), a chilled water circulating pump (19), a solution pump (20) and a heat insulation plate (23), which form four subsystems, namely a refrigerant system, a chilled water system, a cooling water system and a liquid dehumidification system, and the flow direction and the flow rate of a medium are regulated through valves; in summer, a dilute solution is heated by enginewasteheat and condensation heat to concentrate, so as to form a temperature and humidity independently controlled dehumidification link; in winter, the enginewasteheat is used for improving the temperature of an evaporator heat transferring medium, so as to improve the machine set COP (Coefficient Of Performance). According to the low temperature resistant fuel gas heat pump air-conditioning system, the gas engine waste heat can be used effectively, the energy consumption in operation is reduced, and the adaptability of the system tothe low-temperature environment is enhanced.

The invention relates to a self-cooled thermal power acting method and belongs to the field of thermal energy power. A working medium of a thermal power system absorbs heat from a heat source to act. The self-cooled thermal power acting method includes the temperature rising process in which after the pressure of the working medium which is in a low temperature state is boosted and the working medium is heated, the working medium becomes a power air source, the expansion acting process carried out after the power air source enters an expansion acting system and the heat releasing process in which heat of the low-temperature gas working medium which carried out expansion acting is further released. The thermal power system achieves the thermal power circulating process from the temperature rising process, the expansion acting process, the heat releasing process and the temperature rising process. A thermal pump process is used for cooling or liquefying the gas working medium which carried out expansion acting. When heat is released in the thermal pump process, the temperature or the pressure parameter of the working medium is lower than the maximum parameter of the power air source. In the expansion acting process, partial or overall heat which is released in the thermal pump process is absorbed and common acting is carried out. A heat returning process is adopted, so that the heat released by the system is absorbed in the system heat absorbing process. An air energy engine with practicability is obtained, and high-efficiency thermal power circulation of all sorts is achieved. Meanwhile, the invention provides a novel jetting air ejector and a novel thermal pump optimizing system and cost is reduced.

The invention relates to the technical field of air-conditioners in electrical equipment, in particular to an air-conditioner outdoor motor control method, and aims at reducing noise and vibration production in the process of starting to a high rotation speed of an overall unit. The air-conditioner outdoor motor control method includes the following steps: S1, starting up: the rotation speed of an outdoor fan motor is improved to P (i) max from an actual rotation speed P (actual), and then the outdoor fan motor operates for 3minutes, wherein the P (actual) is equal to n P (i) max; and S2, the difference value delta T between temperature of indoor environment and set temperature of an indoor unit is judged. According to the air-conditioner outdoor motor control method, the rotation speed of the starting stage of the outdoor motor is set to be from low to high, and therefore the noise and the vibration are not easily produced in the process of the starting to the high rotation speed of the overall unit, and use comfortable sensation of users is improved.

The invention discloses a heating method and device of a dual-heat source heat pump. The device comprises a heat pump power unit, a condenser, a liquid reservoir, a dry filter, a throttling device, an air source evaporator, a condensed ice evaporator, an ice-water separator, a water make-up tank, a gas-liquid separator, a solenoid valve, a temperature sensor and a controller. In the invention, the two evaporators are switched with each other for operation according to the ambient temperature to form a dual-heat source heat pump device; by means of heat extraction from the ice coagulation process, the evaporating temperature in case of low ambient temperature is increased so as to obtain high average performance coefficient of the heat pump; part of water in the condensed ice evaporator issolidified into ice slurry, thus achieving good flow characteristics and high heat transfer coefficient; and the obtained ice slurry can be used by an external user. The invention has the advantages of efficient energy conservation in case of low ambient temperature, no frosting, high safety, wide application range and the like, and is convenient installation and operation.

The invention relates to a gas heat pump device based on a heat source tower. The gas heat pump device comprises a solution circulation unit, a gas heat pump unit and a waste heat recycling unit, a solution outlet of the heat source tower in the solution circulation unit is connected with a solution inlet of a solution-refrigerant heat exchanger through a solution pump and a first solution valve,a solution outlet of the solution-refrigerant heat exchanger is connected with a solution inlet of the heat source tower, a cooling water circulating water tank, a cylinder sleeve water circulating water pump and a cylinder sleeve heat exchanger in the waste heat recycling unit are connected through a pipeline to form a cylinder sleeve water waste heat recovery loop, the cooling water circulatingwater tank, a second water pump, a flue gas heat exchanger, a first water valve and the cooling water circulating water tank are sequentially connected through a pipeline to form a flue gas waste heatrecovery loop, and a waste heat utilization loop is formed by sequentially connecting the cooling water circulating water tank, the second water pump, the flue gas heat exchanger, a second water valve, a regeneration heater and the cooling water circulating water tank through a pipeline and sequentially connecting the cooling water circulating water tank, the first water pump, a domestic hot water tank and the cooling water circulating water tank through a pipeline.

The invention relates to a phase-change microcapsule for inhibiting a pavement from being iced and a preparation method, and belongs to the field of functional materials. The phase-change microcapsulecomprises a wall material and a core material, wherein the wall material is made from a melamine modified urea-formaldehyde resin prepolymer; the melamine modified urea-formaldehyde resin prepolymeris prepared from melamine, urea and formaldehyde according to a molar ratio of (3 to 5) to (1 to 3) to (5 to 7); the mass ratio of the wall material to the core material is (0.5 to 0.8) to 1. The phase-change microcapsule can be used for effectively controlling the low-temperature distress of an asphalt pavement, and has the advantages of being high in phase-change latent heat, simple to prepare and reversible in phase-change process, free from toxicity and corrosivity and being capable of effectively inhibiting the pavement from being iced and frosted, and the like, is used for improving theadaptive capacity, to the change of an ambient temperature, of the asphalt pavement, and is used for providing help for containing a temperature shrinkage crack and prolonging the service life of an existing pavement.

A wet-film surface air cooler of a composite structure comprises a plurality of fins and a plurality of heat-exchanging pipes, wherein the fins are arranged in parallel at intervals and the heat-exchanging pipes penetrate through the fins. A wet-film layer is arranged on the surfaces of the fins. At least one water absorption belt is extended outwards from the wet-film layer and is used for leading water into the wet-film layer. The wet-film surface air cooler of the composite structure is simple in structure, low in cost, free of power and high in reliability. On one hand, the heat-dissipation efficiency and the COP of condensate water or tap water applied to the surface air cooler of an air conditioner are improved, the air-discharging pressure is reduced when the air conditioner is used for cooling, the COP of a common air cooling air conditioner used for cooling is increased from 3.2 to 4.1, energy is saved by over 30%, and on the other hand, the surface air cooler of the air conditioner is prevented from being frosted in winter.

The invention relates to a defrosting method of a fresh-air machine system. The defrosting method is applied to the fresh-air machine system. The defrosting method includes: detecting the outlet temperature of an air exhausting heat exchanger under the mode of heating of the fresh-air machine system; when the outlet temperature of the air exhausting heat exchanger is lower than a first set temperature, enabling the fresh-air machine system to enter and run in the defrosting mode, namely enabling a fresh-air fan to run at a low speed for stop running, enabling an air exhausting fan to run at a high speed, and enabling a compressor to stop running; when the time of the defrosting mode reaches the set defrosting time or the detected outlet temperature of the air exhausting heat exchanger is higher than a second set temperature, allowing the fresh-air machine system to restore to the heating mode. By the application of the method, the problem about frosting of the air exhausting heat exchanger and a main heat exchanger can be solved under the winter running heating mode, noises brought by switching of a four-way valve can be avoided, and indoor temperature reduction caused by the fact that fresh air is too low in temperature can be prevented.

The invention relates to a full-electric vehicle heat pump air-conditioning system based on air compression and circulation. The full-electric vehicle heat pump air-conditioning system comprises a turbine type air compressor, a turbine type air expander, a transmission coupler, a heat regenerator, a vehicle internal air cooler, a vehicle external air cooler, an air mixing box, a direct current fan, a water stop plate with a condensate water disc, a plurality of air-supply air channels, a plurality of air supply openings, a compartment, a vehicle external air inlet, an exhaust opening, a fresh air opening, an exhaust outlet, a three-way reversing valve and a connecting pipe. In comparison with the prior art, based on the semi-open type heat regeneration type air compression and circulation heat pump principle, the air compression and circulation refrigerating and heat pump technology is applied to a full-electric vehicle air-conditioner, and the problem that when a current full-electric vehicle is used in a severe cold region, the power consumption of the air-conditioner is large is solved.

The invention provides an anti-frosting heat recovery system for preheating outdoor fresh air. The system comprises a fresh air channel, an exhaust air channel, a central heat exchange plate and an anti-frosting system. The outdoor fresh air enters the fresh air channel from a fresh air inlet, indoor exhaust air enters the exhaust air channel from an exhaust air inlet, a circulating pump pushes heat exchange working media in heat exchangers to flow, the temperature of the indoor exhaust air is higher than the temperature of the outdoor fresh air, enhanced heat exchange between the indoor exhaust air and the outdoor fresh air can be realized through the heat exchangers, and therefore the temperature of the central heat exchange plate which the outdoor fresh air makes contact with is raised. The system overcomes the defect that in the prior art, extra energy is consumed to heat fresh air; through a circulating loop formed by the heat exchangers arranged at the exhaust air inlet and the fresh air inlet, heat of the exhaust air is utilized for preheating the fresh air, thus, the problem that an air heat exchange channel frosts due to excessively low outdoor fresh air temperature is solved, and the heat exchange efficiency of the whole system is effectively improved.

The invention provides a heat pump drying system which comprises a compressor, a condenser, a throttling component, an evaporator, a drying chamber, a backheating heat exchanger and a draught fan. Anoutlet of the compressor is connected with a hot end inlet of the condenser, a hot end outlet of the condenser is connected with a cold end inlet of the evaporator through the throttling component, and a cold end outlet of the evaporator is connected with an inlet of the compressor; a cold end inlet of the backheating heat exchanger inputs air acted by the draught fan, a cold end outlet of the backheating heat exchanger is connected with a cold end inlet of the condenser, a cold end outlet of the condenser is connected with an inlet of the drying chamber, an outlet of the drying chamber is connected with a hot end inlet of the backheating heat exchanger, a hot end outlet of the backheating heat exchanger is connected with an inlet of the draught fan, and an outlet of the draught fan is communicated with the outside. By means of the heat pump drying system, the backheating heat exchanger is used for achieving temperature recovering of air discharged from the drying chamber, the temperature of air entering the cold end evaporator is decreased, the temperature of air entering the hot end condenser is increased, the heat exchange temperature difference can be effectively reduced, coldand heat end heat exchange is improved, and the system efficiency is improved.

The invention discloses a solar phase-change heat-storage heat source tower heat pump system (see attached drawing for schematic diagram). The system mainly comprises an improved closed heat source tower (1), a solution expansion tank (2), a phase-change heat storage tank (3), a constant pressure device (4), an ethylene glycol circulating pump (5), a solar heat-collecting panel (6), a load pump (7), a heat source tower water pump (8), a heat source tower heat pump set (9) and an air conditioner end (10), which are communicated through water pipes, and valves are installed for regulation; and the phase-change heat storage tank (3) is in series connected with the improved closed heat source tower (1). When the system is started, the solar heat collector absorbs solar energy, and the energy is stored in the phase-change heat storage tank; the antifreezing solution first enters the heat source tower to be in indirect heat exchange with air (the spray-antifrosting system is stared when necessary), then enters the solar phase-change heat storage tank to be continued to conduct heat exchange, and finally enters the heat pump set for heating after the temperature further increases; and the system can solve the problem of low COP value of the heat pump set in winter in the improved closed heat source tower heat pump system, reduce the operating energy consumption and the operating cost of the heat pump set, and is energy-saving and environment-friendly.

The invention provides a water receiver and a freezer comprising the same. The water receiver comprises a shell; an inner cavity, a water inlet and a water outlet are formed in the shell; the water inlet and the water outlet communicate with the inner cavity; the water inlet is used for being connected with a water drainage pipe; and the shell is further provided with a water storage tank used forforming the water seal and a multi-level buffering structure used for relieving shaking of water flow at the water outlet. The water receiver not only can prevent airflow from being injected into thewater drainage pipe in an inverse direction, but also can relieve or avoid the phenomenon of splashing caused by movement or shaking of water inside the water receiver.

The invention discloses a solar-air source combined heat pump water-free heating system with a heat storage function. The solar-air source combined heat pump water-free heating system with the heat storage function comprises a solar heat collector with the heat storage function and a heat supply system. The solar heat collector comprises a plurality of solar heat collecting pipes, an air inlet, an air outlet, a heat storage layer and a heat preservation layer, wherein the solar heat collecting pipes are distributed between the air inlet and the air outlet and connected through connectors, and an air channel is formed inside the solar heat collector. According to the heating system, after solar energy is converted into heat energy, one part of heat energy directly heats outdoor air, and the other part of heat energy is stored in a phase-change material of the heat storage layer. The heat supply system comprises an evaporator and a heat supply structure, and the evaporator and the heat supply structure communicate with each other. The air outlet of the solar heat collector communicates with the evaporator through a pipeline. Air heated by the solar heat collector and a heating medium in the evaporator are subjected to heat exchange, the heating medium evaporates when being heated, gas is converted into a heating medium of a high temperature after entering a compressor to be compressed, and heat is supplied externally through the heat supply structure.

The invention discloses an air conditioning system and an anti-freezing control method thereof. According to the system and the method, an external environment temperature, an internal environment temperature, an inner fan wind grade and an outer fan wind grade are detected, corresponding detection values are distributed in corresponding sections An, Bn, Cn and Dn, the An, the Bn, the Cn and the Dn are permutated and combined to obtain N kinds of results, En is used for representing each result value, and the En values correspond to a corresponding different first preset low-pressure value Px,a corresponding different first preset time value Tm, a corresponding different second preset low-pressure value Py and a corresponding different second preset time value Ta. The optimal Px value, Tmvalue, Py value and Ta value are confirmed after a lot of experiments, so that the condition that the system enters an anti-freezing condition and the condition that the system exits from the anti-freezing condition are confirmed, the good anti-freezing effect can be achieved, and the problem that the system carries out defrosting in the situation that frost does not exist can be avoided.

The invention provides an air-cooled refrigerator and an air duct cover plate and a cabinet of the air-cooled refrigerator. The air duct cover plate of the air-cooled refrigerator is provided with strip-type air supply outlets which are transversely arranged, and wind is obliquely upwardly sent out through the strip-type air supply outlets. The air duct cover plate is simple in structure and convenient to manufacture; the strip-type outlets are transversely arranged in the air duct cover plate, so that trends that the wind sent out descends vertically are alleviated, closed areas are avoided forming among the neighboring air supply outlets due to the fact that a plurality of air supply outlets are formed, airflow dead corners are avoided, and condensation and frost formation are prevented inside the air-cooled refrigerator.

The invention discloses a multi-loop condensation technology for recovery of propylene in polypropylene device tail gas. For tail gas containing steam, firstly, drying processing is carried out or a frost prevention plug and a defrosting measure are arranged in the condensation process of the tail gas. A refrigerating unit is arranged, glycol refrigerated water is generated, and tail gas in different discharging points is condensed by glycol refrigerated water through heat exchangers respectively. Glycol refrigerated water and the tail gas in different discharging points are subjected to heat exchange in respective heat exchanges respectively, and the vast majority of propylene in the tail gas is condensed. Because ingredients and pressures of tail gas in different discharging points are different, respective condensation is selected, the self pressure of tail gas can be utilized, and propylene is recovered in an effective manner. In the obtained condensate liquid, the content of propylene is more than 90% (mass), the content of propylene and propane is more than 99.7% (mass), the total content of light components of hydrogen, nitrogen, C2 and the like is less than 0.15% (mass), and recovery of propylene is achieved indeed.

The invention discloses an air conditioning system control method and relates to the technical field of air conditioning equipment. According to the method, the fresh air enthalpy value and the dew point enthalpy value are involved in calculation and control of the compressor refrigerating capacity, since the enthalpy values are involved in calculation of the compressor refrigerating capacity, thethermal insulation amount in the air is fully considered, shortcomings of PID control when the compressor input is in a certain critical state are covered, the stability of an air conditioning systemis further optimized, the problem of frosting caused by the excessively large or early input of compressors of air conditioning units in coastal launching sites of our nation currently is solved, andthe energy-saving purpose of the air conditioning system is also achieved while the precision and stability of the air conditioning system are guaranteed.