87results about How to "Raise the supply air temperature" patented technology

The invention relates to compatible control method for hot-blast stove of blast furnace, which comprises: determining the lowest blast temperature, designing correlated process parameters and constructing case database; extracting burning data to add into database; obtaining real-time process parameters; with case-base inference method, predicting the time that blast temperature drops down to lowest temperature as the blast end time and the burning terminal time of successive furnace; comparing the predicted time with preset terminal time of successive furnace; according to result, changing gas supply to achieve the waste gas temperature upper limit with set terminal; repeating said steps to realize the variable-period running. This invention increases total blast temperature, and reduces blast temperature.

The invention relates to a superhigh-temperature heat pump drying system. The superhigh-temperature heat pump drying system comprises a drying room, an air return duct, a circulating draught fan, an exhaust duct, an exhaust fan, an air heat recovering device and at least two heat pump units. The air return duct is communicated with an air supply port and an air return port of the drying room. The circulating draught fan is arranged in the air return duct. The exhaust duct is communicated with the air return duct. The exhaust fan is arranged at a duct opening of the exhaust duct. The air heat recovering device is arranged at the intersection of the air return duct and the exhaust duct. The heat pump units are used in parallel. According to the superhigh-temperature heat pump drying system, the two or more heat pump units work in parallel, and the drying room is heated by absorbing low-grade ambient air heat at the initial stage of the drying process, so that the temperature is increased; after the temperature is increased to a certain extent, high-temperature and high-humidity air exhausted out of the drying room is dehumidified, and sensible heat and latent heat contained in the high-temperature and high-humidity air are recovered to the maximum extent; due to the gradient difference of the temperature ranges of cycle working fluid of the heat pump units, relatively higher air supply temperature can be provided through the system, and meanwhile it is guaranteed that the evaporating temperature of the drying units is sufficiently increased.

The present invention discloses an air-conditioning unit for machine room, which comprises an indoor air-conditioner and a chiller unit. The chiller unit is connected with the indoor air-conditioner. Chiller water of the indoor air-conditioner is provided by the chilled unit which comprises a compressor, a condensing coil, an expansion valve and an evaporator that are sequentially, front and back connected. A centrifugal fan, a static pressure box and an air outlet of the indoor air-conditioner are sequentially connected. The air outlet is positioned under the indoor air-conditioner. An air return vent is positioned at top of the machine room. The chilled unit also comprises a heat exchanging disc of natural cooling and a tee regulating valve. One end of the heat exchanging disc of natural cooling is connected with a water return pipe of the chiller water of the air conditioning system, and the other end is sequentially connected with the tee regulating valve and an evaporator. The other end of the tee regulating valve is connected with a water return bypass pipe of the air conditioning system. The present invention can optimize the air flow and the distribution of the temperature inside the machine room so as to achieve the best effect of the heat exchanging, and saves the energy by the improvement of the difference between the air supplying temperature and the air returning temperature, and greatly improves the effect of energy-saving by adopting the technical proposal of natural cooling.

An air conditioning system is provided, including: an outdoor air conditioner, configured to cool outdoor air at an outdoor temperature into dehumidified air at a dehumidified temperature, to heat the dehumidified air into supply air at a supply air temperature, and to provide the supply air to a plurality of rooms; a plurality of indoor air conditioners provided inside the plurality of rooms, respectively, each indoor air conditioner being configured to draw in input air at an input temperature, to heat or cool the input air into output air at an output temperature, and to provide the output air to a corresponding room; a control circuit configured to determine whether an air conditioning load exists in a set number of the plurality of rooms, and to adjust operation of the outdoor air conditioner to set the supply air temperature based on whether the air conditioning load is determined to exist.

The invention discloses an air condition that carries low temperature heating function and the method to control. A temperature sensor that can detect the running mode of the air condition is set in it. The sensor connects to a controller that is set a temperature reference value in it. The controller would control the air condition to run in the mode of low temperature heating by the result of comparing the detecting signal and the reference value. When in low temperature heating mode, the controller outputs control signal to control the relay to adjust the fan motor running in low speed mode, and control the assistant electric heater to start. The invention could obviously increase the blow temperature when heating and improve the effect of low temperature heating.

The invention discloses a flue gas recirculation type garbage pyrolysis gasification oxygen-rich incinerator which comprises an incinerator main body, a flue gas recirculation type air feeding system, a flue gas filter device, an oxygen-rich air feeding system, a flue gas waste-heat heat exchanger and a flue gas purifying device, wherein the incinerator main body comprises a combustion chamber I and a combustion chamber II which are respectively used for garbage pyrolysis gasification and incineration of combustible materials; the circulated flue gas is injected into the incinerator through the flue gas recirculation type air feeding system, so that turbulivity in the incinerator is improved, garbage incineration is strengthened, incompletely-combusted pollutants such as a dioxin precursor and the like are reduced, and discharge of the pollutants is reduced. The oxygen-rich air feeding system can increase an incineration temperature, and can reduce consumption of auxiliary fuels; the flue gas filter device and the flue gas purifying device can further reduce discharge of pollutants; and the flue gas waste-heat heat exchanger can recycle flue gas waste heat. The flue gas recirculation type garbage pyrolysis gasification oxygen-rich incinerator can effectively solve the problems that a garbage thermal value is low, water content is high, an incineration temperature caused by low oxygen content in air is low, combustion efficiency is poor, consumption of auxiliary fuels is high, discharge of pollutants is not up to standard, and the like.

The invention discloses a tunnel type multi-stage heat pump series drying and dehumidifying system. The tunnel type multi-stage heat pump series drying and dehumidifying system comprises a multi-stage heating chamber, a multi-stage dehumidification chamber, a tunnel type drying chamber, a return opening and a mixing chamber. An inlet of the multi-stage heating chamber is provided with a main air blower and the multi-stage heating chamber is connected with the mixing chamber. An outlet of the multi-stage heating chamber is connected with an inlet of the tunnel type drying chamber. An outlet of the tunnel type drying chamber is connected with an inlet of the multi-stage dehumidification chamber through the return opening. An outlet of the multi-stage dehumidification chamber is connected with the mixing chamber. The closed multi-stage heat pump drying and dehumidification system of the invention is not affected by the external environment. Compared with a single-stage heat pump drying system, multi-stage dehumidification effectively removes the moisture in the dry air and reduces the temperature difference of the single-stage air, and multi-stage heating effectively improves the air supply temperature and reduces the temperature difference of single-stage air. The pressure ratio of a compressor is reduced. The efficiency of the compressor and the dehumidification efficiency are improved effectively.

The invention provides an automatic control method for an air conditioner system. The air conditioner system comprises an air conditioner outdoor unit, an air conditioner host and an air conditioner remote controller integrating an infrared temperature measuring device. The method comprises the steps conducted on the air conditioner remote controller, an infrared temperature measuring sensor arranged on the air conditioner remote controller is utilized for measuring the surface temperature of a target human body in the environment, and the surface temperature of the target human body is obtained; and according to the surface temperature of the target human body and body temperature normal range parameters, the air conditioner air supply operation is controlled. The air conditioner remote controller of the air conditioner system integrates the infrared human body temperature measuring function and an independent processing unit. A module with the self-adjusting function is arranged in the air conditioner remote controller, and transformation on a conventional air conditioner host is not needed. During sleeping, the temperature measuring information of the face and other naked positions is fed back to the processing unit on the air conditioner remote controller. By means of the method, whether air conditioner air supply needs to be adjusted or not is judged, and accordingly whena person sleeps or is in an unconsciousness state, the person can be in the proper air temperature environment.

The invention discloses a fresh air treatment device for indirect evaporative cooling return air total heat recovery. The fresh air treatment device is composed of a sensible heat recovery device for supply air and return air, a return air total heat recovery device, an air treatment device and the like. The sensible heat recovery device is adopted for the fresh air treatment device, the supply air low in temperature is used for cooling the indoor return air, a state point of the return air is close to a saturation line before the return air enters the total heat recovery device, and therefore the total heat recovery process of fresh air and the return air is close to the saturation line, and the efficiency of the total heat recovery device is improved. Meanwhile, the supply air temperature of the fresh air is increased, and the fresh air can be fed indoors directly. Through the fresh air treatment device, recoverable energy of the return air is fully used, the input cooling capacity of a cold source is reduced, and the energy efficiency of the fresh air treatment device is improved. In addition, through working condition switching, the fresh air treatment device can have the functions of recovering heat of the return air and heating and humidifying the fresh air in winter.

The invention discloses a displacement ventilation air conditioner room air supply device and method. The air supply device comprises an air supply system, an air supply opening is formed in the lowerportion of the side wall of an air conditioner room, and an air return opening is formed in the top of the air conditioner room; and the air supply system comprises an axial flow fan and an air supply nozzle, the axial flow fan comprises an axial flow fan motor, the air supply nozzle is connected with the axial flow fan through a spiral hose and a straight pipe which is connected with the spiralhose, and a wind speed and air volume adjusting valve is arranged on the straight pipe. The displacement ventilation air conditioner room air supply method comprises the following steps that 1, freshair is sent into the air conditioner room from the air supply opening to form a fresh air layer; and 2, the fresh air in the fresh air layer enters the air supply system under the suction effect of the axial flow fan and is sent out by the air supply nozzle. According to the displacement ventilation air conditioner room air supply device and method, acting areas can be adjusted freely along with changes of room division or positions of an indoor table / working table, the action range is flexible, a comfortable and healthy hot environment can be created for indoor personnel at a higher room background temperature, and the energy consumption of an air conditioner is effectively saved.

The invention discloses an energy-saving air conditioner integrating humidification, fresh air and air processing. The energy-saving air conditioner resolves the problem that an existing data central apparatus room is high in energy consumption. The energy-saving air conditioner integrating humidification, the fresh air and air processing comprises a cabinet (1), a wet film humidification mechanism, an air control mechanism, a water supply mechanism, a draught fan (11), an air flue and an electric cabinet (9), wherein the wet film humidification mechanism is arranged in the cabinet and used for humidifying and cooling air, the air control mechanism is located at the top in the cabinet (1) and used for air return and fresh air conveying, the water supply mechanism is used for supplying a water source, the draught fan (11) is located at the bottom in the cabinet (1), the air flue is formed in the cabinet (1) and used for conveying the air out of the air control mechanism through the draught fan, and the electric cabinet (9) is used for controlling operation. On the basis, the invention further discloses a fresh air enthalpy value control method. According to the energy-saving air conditioner and the fresh air enthalpy value control method, double-layer humidification and cooling are adopted, the fresh air enthalpy value control method is used in a matched mode, and the energy-saving and emission reduction effect of the air conditioner is improved furthest.

The invention discloses a parallel loop heat pipe heat dissipation device used for heat dissipation of a server chip, which comprises a cooling box, N evaporators, N-1 three-way structure, N-section gas lines, N-section liquid line sand N-1 evaporation lines; N evaporators pass through the evaporation pipeline, a liquid line and a gas line are connecte in parallel to that cooling box; At that sametime, the first gas line extend into the cooling box, A loop of coil is formed inside that cooling box, A coil extends out of the cooling box and communicates with the liquid line of the first section, the N evaporator extends into the interior of the server and contact N chips and fixed with the N chips; The heat generated in the working process on the chip evaporates the liquid in the evaporator into gas, which is sent to the cooling box by the evaporation pipeline and the gas pipeline, and the cooling fluid in the cooling box is heat exchanged with the cooling fluid in the cooling box andcondensed into liquid, thereby realizing the chip heat dissipation, N >= 1. The invention simplifies the heat dissipation structure, improves the heat dissipation efficiency, and reduces the energy consumption cost and the potential safety hazard.

The invention relates to a ventilation system based on an air and light complementary technology. An air inlet is internally provided with partition boards and is divided into multiple air channels. Any air channel of the air inlet is provided with a bladeless fan. An air draught fan blade is installed on a driving shaft in the air inlet, and the driving shaft is provided with a sealing plate. The periphery of a pipeline below the sealing plate is evenly provided with air holes, and a fresh air pipeline is arranged above the air inlet. An air valve is arranged below the air inlet, and the air valve is connected with a heat exchanger. The side face of the heat exchanger is provided with a used air pipeline which is connected with a solar heat collecting pipeline coaxial with the air draught fan blade. The solar heat collecting pipeline is connected with an exhaust fan, and the lower portion of the heat exchanger is connected with a volute cyclone. According to the ventilation system based on the air and light complementary technology, a solar cell panel can be used for power generating, energy accumulating, heating and exhausting, authigenic ventilation is formed, pollution is avoided, sustainability is achieved, and zero-energy-consumption and high-efficiency ventilation can be achieved.

The invention discloses a new air dehumidification system with double heat exchange cores. The system comprises a sensitive heat exchange core, a total heat exchange core, an evaporator, a first condenser, a second condenser, a compressor, a four-way reversing valve, a bidirectional expansion valve, an air exhaustion blower and an air feeding blower, wherein the compressor is sequentially connected with the second condenser, the four-way reversing valve, the first condenser, the bidirectional expansion valve and the evaporator by a refrigerant conveying pipeline; the air feeding blower is arranged on one side of the first condenser; the air exhaustion blower is arranged on one side of the second condenser; the sensitive heat exchange core is arranged at an indoor air return inlet; and the total heat exchange core is arranged at an indoor new air inlet. The new air dehumidification system disclosed by the invention has a simple structure and a good energy-saving effect and is convenient to use; the pre-cooling of the new air can be realized without external energy sources, and the energy consumption is reduced.

The invention discloses a refrigerator which comprises a refrigerator body, an evaporator, a middle air channel, a heat source and a cold air self evaporator. A refrigerating chamber and a freezing chamber are defined in the refrigerator body. One side of the refrigerating chamber is provided with a refrigerating air input channel communicated with fluid of the refrigerating chamber, and one side of the freezing chamber is provided with a freezing air input channel communicated with fluid of the freezing chamber. The evaporator is arranged in an evaporator cavity in the rear portion of the freezing chamber. The freezing air input channel is communicated with fluid of the evaporator cavity. The middle air channel is formed between the refrigerating air input channel and the freezing air input channel and selectively communicated with the fluid of the refrigerating air input channel and the fluid of the freezing air input channel. The middle air channel comprises a first air path and a second air path which are arranged side by side. The heat source is arranged in the second air path. The cold air self evaporator can selectively enter the first air path and / or the second air path through the freezing air input channel and then enter the refrigerating air input channel. The refrigerator can achieve multiple air supply modes of the refrigerating chamber and meet the different requirements of users.

The invention relates to a comprehensive optimized smoke discharge waste heat deep recycle system of smoke in a thermal power plant. The system comprises a smoke cooler is arranged at the back of a dust remover and in front of a desulfurizing tower in a smoke channel. A preferable scheme further comprises a smoke discharge waste heat utilizing device used for enabling absorbed heat to heat condensation water or enabling a steam air heater to heat air to improve air supply temperature. Compared with the prior art, the system greatly reduces smoke discharge temperature, simultaneously completely utilizes recycled heat and improves unit efficiency.

The invention discloses a heat-pump-driven indirect evaporative cooling return air total heat recovery fresh air treatment device. The heat-pump-driven indirect evaporative cooling return air total heat recovery fresh air treatment device comprises a return air treatment system, a fresh air treatment system and a mechanical refrigeration system. The return air treatment system comprises a return air-water heat exchanger and a plurality of spraying filler modules which are connected in sequence. The fresh air treatment system comprises a supply air-water heat exchanger, a surface air cooler and a plurality of fresh air-water heat exchangers which are connected in sequence. According to the heat-pump-driven indirect evaporative cooling return air total heat recovery fresh air treatment device, irreversible loss in the heat and mass transfer process can be effectively avoided, the total heat recovery efficiency of the systems is improved, the cooling capacity input by a cold source is reduced, and the total energy efficiency of the fresh air treatment device is improved.

The invention provides an air conditioner control method, an air conditioner and a computer readable storage medium. The method comprises the steps that when it is determined that the obtained indoortemperature value is smaller than the first preset temperature value and the obtained outdoor temperature value is smaller than the second preset temperature value, the air conditioner is controlled to run according to the preset mode; and after the air conditioner runs in the preset mode, the refrigerating amount is reduced, and the rotation speed of an indoor unit draught fan is higher than thefirst preset rotation speed threshold value. The invention further provides the air conditioner achieving the above method and the computer readable storage medium. According to the air conditioner control method, the air conditioner and the computer readable storage medium, the refrigerating amount of the air conditioner can be adjusted according to the indoor temperature and the outdoor temperature, and the comfort of the human body feeling is improved.

The invention belongs to the technical field of refrigerators, and discloses a refrigeration temperature control refrigerator, a method, a refrigerator, a controller, a terminal and a storage medium.Cold energy of an evaporator chamber is introduced, and meanwhile mixed with return air of a refrigerating chamber; the supply air temperature of the refrigerating chamber is reduced; and the air supply of the refrigerating chamber is controlled within the optimal temperature range through regulation of the opening degree of a freezing air door. According to the refrigeration temperature control refrigerator, through a brand-new air supply mode, it is guaranteed that the air supply temperature of the refrigerating chamber is the optimal air supply temperature required for the refrigerating chamber and the freezing chamber, and the temperature control precision of the refrigerating chamber is improved, and the temperature stability of the refrigerating chamber is improved; and the temperature fluctuation of the refrigerating chamber is reduced, and the fresh-keeping effect of the refrigerating chamber is improved. Through optimal control over the air temperature, the situation that theair with the temperature of far lower than 0 DEG C is directly blown to the refrigerating chamber and consequently food is frozen and frostbitten is avoided, meanwhile the icing phenomenon that the temperature of the lower portion of the refrigerating chamber is lower than 0 DEG C due to cold accumulation at the bottom of the refrigerating chamber is avoided, and reliability of the refrigerator isimproved.

The invention provides a data center natural cooling system employing solar power. The data center natural cooling system comprises a natural cooling system and also comprises a solar auxiliary cold supply system, wherein the natural cooling system comprises a cooling unit, a cooling water pump, a liquid-cooling system and an air-cooling system, the liquid-cooling system and the air-cooling systemare connected in parallel and then are connected in series with the cooling water pump and the cooling unit, the solar auxiliary cold supply system and the natural cooling system shares the same cooling unit, and the solar auxiliary cold supply system is connected with the air-cooling system and is used as temperature compensation equipment of the air-cooling system when natural cooling capability is not enough. Data center natural cooling and heat dissipation is achieved by the natural cooling system comprising the liquid-cooling system and the air-cooling system, the solar absorption type refrigerating system is used as temperature compensation equipment of the air-cooling system, and safe, reliable, continuous and stable running of the data center cooling system is ensured by favorablecomplementarity of the air-cooling system and the solar absorption type refrigerating system.

The invention discloses a grain drying dehumidifying heat pump unit and a grain drying circulation heat pump system, and belongs to the field of drying dehumidifying equipment. Three independent heat pump systems and a sensible heat type runner heat exchanger are installed in a dehumidifying heat pump unit box body, a cooling dehumidifying part is installed in an upper layer box body, an air inlet end is connected with an air inlet section of the unit, and an air outlet end is connected with evaporators; and a heating part is mounted in a lower layer box body, an air inlet end is connected with compressor sections of the unit, and an air outlet end is connected with air cooling condensers. In the grain circulation heat pump drying system, the dehumidifying heat pump unit is in hot air connection with a batch type grain dryer, the batch type grain dryer is connected with a precision dust remover, the precision dust remover is connected with a circulation fan, and an outlet of the circulation fan is connected with the dehumidifying heat pump unit and an exhaust pipe. The unit and the system are environmentally friendly, energy-saving and emission-reducing, and are efficient and stable in operation, the cost is reduced, the unattended automatic operation can be realized, good quality of dried grains can be guaranteed, then the application region of the heat pump system for grain drying is expanded, and the developing of low-temperature drying of grains is embodied.

The invention discloses a multifunctional dehumidifying and a drying machine system. An outlet E of a drying box is connected with a temperature adjusting cooler through an air duct; the temperature adjusting cooler is connected with an inlet C of a heat recoverer through an air duct; an outlet D of the heat recoverer is connected with an evaporator through an air duct; the evaporator is connectedwith an inlet A of the heat recoverer through an air duct; an outlet B of the heat recoverer is connected with a condenser through an air duct; the condenser is connected with a circulating fan through an air duct; and the circulating fan is connected with an inlet F of a drying box through an air duct, so that drying medium circulation of a circulating drying channel is realized. According to the multifunctional air source air cooling type or water cooling type dehumidifying and the drying machine system which is capable of achieving rapid preheating, heating dehumidifying, constant-temperature dehumidifying and cooling dehumidifying, the problems that the drying time is long, the energy consumption is high, the dehumidification energy efficiency is low, a system is unstable and the temperature of a drying room is inconvenient to adjust are solved, so that the purposes of heat recovery, and rapid heating and temperature-regulating dehumidification of the drying space and materials can be achieved at the same time.

The invention relates to a fresh air heat recovery device with an anti-frosting function, and belongs to the technical field of building environment and equipment engineering. Based on the problem that in northern severe cold and cold areas, fresh air heat recovery devices used in different kinds of buildings are frosted and are high in anti-frosting energy consumption, the following technical scheme is provided: a heat pump drives a rotary wheel to realize dehumidification, so indoor air return humidity is lowered and frosting of the heat recovery device is prevented; compared with the regular method of electrical heating is adopted for preheating of outdoor fresh air to prevent frosting, the method can realize in-depth recovery of energy in exhausted air, the air supplying temperature ishigh, and dry fresh air can be humidified; and at the same time, energy consumption of a the heat pump is much lower than energy consumption of electrical heating, so the device has significant advantages from both the perspective of comfortableness and the perspective of energy saving.

The invention relates to a novel air conditioning system in a machine room based on underfloor air distribution and an air distribution method thereof. A cold / hot water output end of an air source cold / hot water unit is connected with the input end of a water pump. The input end of the water pump is connected with the input end of an electrically operated valve. The output end of the electrically operated valve is connected with the first input end of an air handling unit, and the first output end of the air handling unit is connected with the input end of the air source cold / hot water unit. The second output end of the air handling unit is connected with the air input end of the room through a first pipeline. The air output end of the room is connected with the second input end of the air handling unit through a second pipeline. The third input end of the air handling unit is communicated with atmosphere. An inner air distribution cabinet is placed on an elevated floor. An air distribution opening of an air distribution channel of the inner air distribution cabinet is connected with an air distribution opening of the elevated floor. According to the system, air is directly distributed to nearby computers in layers of the air distribution cabinet, so that high air distribution temperature is allowed, thereby further improving the water supply temperature of the air source cold / hot water unit, improving the energy efficiency ratio and saving the energy source.

The invention discloses an automatic-control energy-saving type smoke plume eliminating device. The automatic-control energy-saving type smoke plume eliminating device comprises an air heater system,a condensation water system, a smoke gas cooling system, a smoke gas heating system, and a smoke temperature automatic-control system, wherein smoke gas at an outlet of a dust remover is cooled by a primary cooling device, so that ability of carrying water when the smoke gas passes through a desulfurizing tower is reduced; and the smoke gas passes through the desulfurizing tower. Smoke gas at theoutlet of the desulfurizing tower is condensed by a secondary cooling device to separate out water in the smoke gas, and the cooled smoke gas enters a smoke gas heating system; the smoke temperature automatic control system controls a proper smoke gas temperature, and the heated smoke gas is exhausted into atmosphere through a chimney, so that the purpose of eliminating smoke plume is achieved. The system can effectively realize multiple effects of saving energy, saving water, reducing emission and eliminating smoke plume, and has relatively good economical and environmental benefits.

The invention discloses a low-environment temperature heat pump drying unit. The unit comprises a circulating drying medium process, a dehumidifying and drying process and a refrigerant drying systemprocess; the refrigerant drying system process comprises a main path refrigerant loop channel, a compressor air-supplement enthalpy-increasing refrigerant loop channel and a refrigerant system defrosting process; and the drying system capable of realizing safe operation in the low-temperature environment or a severe environment through jet enthalpy increasing is high in heating capacity is high inheat exchange efficiency, and can obtain enough heat from the low-temperature environment of minus 25 DEG C. According to the low-environment temperature heat pump drying unit, a heat pump technology, an air jetting enthalpy increasing technology and a heat recovery technology are adopted and are integrated into the low-environment temperature heat pump drying unit.

Disclosed is a direct evaporation type air cooling type fresh air unit. An inlet air valve (13) is arranged at one end of an air conditioning cabinet (1), an air filter (14) is arranged on the inner side of the inlet air valve, a fan (2) is arranged at the other end of the air conditioning cabinet, a first-level refrigerating system, a second-level refrigerating system and a third-level refrigerating system are arranged, the first-level refrigerating system is provided with a first refrigerating circuit, a second refrigerating circuit and a third refrigerating circuit, the first refrigerating circuit, the second refrigerating circuit and the third refrigerating circuit can independently or simultaneously run, a first-level evaporator (11) shared by the first refrigerating circuit, the second refrigerating circuit and the third refrigerating circuit is arranged in the air conditioning cabinet, the second-level refrigerating system is provided with a fourth refrigerating circuit and a fifth refrigerating circuit, the fourth refrigerating circuit and the fifth refrigerating circuit can independently or simultaneously run, a second-level evaporator (6) shared by the fourth refrigerating circuit and the fifth refrigerating circuit is arranged in the air conditioning cabinet, and the third-level refrigerating system is composed of a sixth refrigerating circuit, and a third-level evaporator (4) is arranged in the air conditioning cabinet. The unit can stably run under the wide weather condition, the dehumidification requirement of the air conditioning system is met, the air supply comfort is improved, and moisture condensation is prevented from happening to an air outlet.

The present invention relates to a high heating flux rack heat radiation cooling method and a high heating flux rack composite heat exchanger. The high heating flux rack composite heat exchanger comprises a rack heat exchanger and a heat transportation device. The rack heat exchanger is arranged at a back plate or a side plate of a rack and capable of performing exchange with heat air from a highheating flux rack and independently completing a full process of heat absorption and heat releasing, the heat transportation device is an independent device having one end being in surface contact with the rack heat exchanger and having the other end located at the external portion of the rack, the rack heat exchanger performs exchange with the heat air in the high heating flux rack and then transmits heat to one end of the heat transportation device with surface contact, and the heat transportation device transports heat to the other end through internal medium itself so as to take the heat out of the rack. The high heating flux rack composite heat exchanger can greatly save traditional air conditioning energy consumption and has very good safety and reliability.