1343results about How to "Meet cooling needs" patented technology

The invention provides a control method for an air-conditioner, a control device for the air-conditioner and an air-conditioner. The method comprises the steps that after the air-conditioner receives a starting-up instruction, whether an indoor temperature detecting device of the air-conditioner works normally is judged; when it is judged that the indoor temperature detecting device does not work normally, first indoor heat exchanger coiler temperature, measured when the air-conditioner does not operate, of the air-conditioner is obtained, and the corrected first indoor heat exchanger coiler temperature serves as current first indoor temperature of the air-conditioner; when the air-conditioner receives an operation mode instruction, according to target indoor temperature included by the operation mode instruction and the current first indoor temperature, the air-conditioner is controlled to enter an operation mode corresponding to the operation mode instruction or stop operation. By means of the technical scheme, when an indoor temperature sensor of the air-conditioner is disconnected or breaks down, it can be ensured that on the basis of not increasing the cost of the air-conditioner, the operating state of the air-conditioner can still be controlled accurately so as to control normal operation of the air-conditioner.

The invention relates to a cooling control system for a power battery of a hybrid electric vehicle. By adoption of the cooling control system, influence of the vehicle operation working condition to the battery pack cooling is analyzed and evaluated comprehensively; and air cooling, water cooling and compressor refrigerating are controlled to realize in-time and effective cooling by virtue of integration of the working environment temperature of the battery pack, the residual electric quantity of the battery and the battery output power according to different requirements in battery cooling, so that compatibility and part sharing with the conventional automobile thermal management system are realized, and power consumption management can be realized easily. The invention also relates to a cooling control method for the power battery of the hybrid electric vehicle; the cooling control method comprises three cooling modes, including a natural water cooling mode, a fan water cooling mode and a forced cooling mode, so that requirements of different levels in battery pack cooling can be satisfied, stable transition of different cooling modes can be realized, and energy-saving design of the system is also taken into consideration.

The invention provides an electric vehicle cooling system which comprises three circulating loops: a small circulating loop, a large circulating loop and a warm air loop, wherein the three loops have a shared cooling pipeline, and the shared cooling pipeline is provided with a heat radiator and an electric pump; the small circulating loop is that a cooling liquid sequentially passes through the electric pump, a motor controller and a motor through a cooling pipe, and does not pass through the heat radiator; the large circulating loop is that a cooling liquid sequentially passes through the electric pump, the heat radiator, the motor controller and the motor through a cooling pipe; the warm air loop is that a cooling liquid passes through the electric pump, a warm air heat exchanger, the motor controller and the motor through a cooling pipe; the cooling system also comprises an expansion box; the heat radiator and a pressure-limiting valve of a warm air loop heat exchanger are connected with an upper water port of the expansion box; the lower water port of the expansion box and a main cooling pipe are connected in parallel to a water inlet of the electric pump; temperature sensors are installed at the inlet part of the motor controller, the cooling liquid outlet part of the electric pump and the outlet part of the heat radiator; sensor signals above are all connected to a cooling system control unit; and the cooling system control unit controls the operation of the system according to the information obtained from a vehicle-mounted bus as well as sensor information. The invention also provides a control method for the electric vehicle cooling system, and the normal operation of the power part of the electric vehicle is ensured.

The invention discloses a refrigeration control method of a multi-split air conditioner. The method includes the steps that in the operation process of the air conditioner, capability demand values of indoor units, in a running state, of the air conditioner are acquired; set temperatures of the indoor units and the current indoor environment temperature are acquired; the accumulated value of the capability demand values of the indoor units is corrected according to the set temperatures of the indoor units and the current indoor environment temperature, and a corrected value is obtained; the operation frequency of a compressor is correspondingly adjusted according to the corrected value. The invention further discloses the multi-split air conditioner. The refrigeration demand of an indoor room is met, and meanwhile the frequency of the compressor is accurately controlled; besides, the air conditioner is good in energy efficiency.

The invention discloses an air conditioner and a low-temperature cooling control method and device of the air conditioner. The low-temperature cooling control method of the air conditioner includes the following steps: detecting the current temperature of the outdoor environment; judging a temperature interval to which the current temperature of the outdoor environment belongs, wherein the temperature of the outdoor environment is divided into a plurality of temperature intervals, and each temperature interval corresponds to one draught fan rotating speed; controlling the air conditioner to run in the cooling mode, and controlling an outdoor draught fan of the air conditioner to run at the draught fan rotating speed corresponding to the temperature interval to which the current temperature of the outdoor environment belongs. In this way, the cooling requirement of a user in the low-temperature environment can be met; for example, the air conditioner can normally carry out cooling at the temperature ranging from -15 DEG C to 20 DEG C, and the requirement that 100% of the cooling capacity is output can be met.

The invention discloses a central air conditioning system energy-saving control method based on a neural network and a genetic algorithm. The method is characterized by comprising the following stepsthat equipment operation data and building load data of an air conditioning system are acquired; the data are preprocessed; the preprocessed data are learned through the neural network to obtain a system energy efficiency model; operation state optimization parameters are obtained through optimization by means of the genetic algorithm according to the system energy efficiency model; and accordingto the operation state optimization parameters, optimal control is carried out on operation of the air conditioning system. Compared with existing control technologies, the control method has the following beneficial effects that the situations that after long-time operation of equipment, the performance is reduced, and factory data provided by a factory cannot be applied to energy efficiency analysis are avoided, and a reasonable energy efficiency curve plays an important role in formulation of operation strategies; and the system energy efficiency model is established through the neural network, the operation parameters are optimized by using the genetic algorithm, and an energy-saving strategy meeting the refrigeration requirement of the current system can be quickly matched.

The invention relates to an engine cooling system adopting a delayed circulation flow path. The engine cooling system comprises a high-temperature circulating cooling system and a low-temperature circulating cooling system, wherein the high-temperature circulating cooling system comprises a large circulation cooling fluid flow path, a small circulation cooling fluid flow path and a delayed circulation cooling fluid flow path. The engine cooling system has the beneficial effects that the heating requirements of all the parts after an engine stops can be better met and the problem of the flow direction of cooling circulation among different parts can be solved by adding an electronic control auxiliary water pump to the high-temperature circulating cooling system and realizing delayed circulation.

The application brings forward a fixed-frequency air-conditioning system, a control method and device of the fixed-frequency air-conditioning system, an electronic device and a storage medium. The method comprises the following steps: detecting air intake temperature of an indoor heat exchanger when the system operates in a refrigeration mode; obtaining temperature difference value between the airintake temperature and the set temperature of the fixed-frequency air-conditioning system; and adjusting the opening degree of an electronic expansion valve according to the temperature difference value and controlling a compressor to start and close. Through the electronic expansion valve, quantity of coolants entering the indoor heat exchanger is adjusted in order to fulfill the purpose of precisely controlling indoor temperature. The indoor temperature is kept stably close to the set temperature. Therefore, a user feels more comfortable. The compressor is prevented from frequent start andstop.

The invention relates to the technical field of IT and discloses a cabinet server and a control method of the cabinet server. The cabinet server comprises a cabinet, a rotating speed acquisition device, a temperature acquisition device and a controller. Multiple separation boards are arranged in the cabinet so that multiple air ducts can be formed, and each air duct is internally provided with a fan; the air ducts are arranged in at least one air duct set, each air duct set comprises one convertible air duct and two side air ducts; air outlets of the convertible air ducts are provided with air outlet baffles; the separation boards between the side air ducts and the convertible air ducts are provided with ventilation openings and ventilation opening baffles; the controller is in signal connection with the rotating speed acquisition device and the temperature acquisition device and can control the rotating speed of the fans in the convertible air ducts and the rotating speed of the fans in the side air ducts according to information acquired by the rotating speed acquisition device and the temperature acquisition device, so that the ventilation openings are controlled to be opened or closed through the ventilation opening baffles. When the heat dissipation condition is met, the noise of the fans is the lowest when the cabinet server works.

The invention provides an air supply control method and device of an air-cooled refrigerator. The air supply control method of the air-cooled refrigerator comprises the steps that the actual temperature in a cold storage chamber and actual temperature in a freezing chamber are detected through a first temperature sensor and a second temperature sensor which are arranged in the cold storage chamber and the freezing chamber correspondingly; whether the actual temperature in the cold storage chamber is larger than or equal to the preset turn-on temperature is judged, and if yes, an air door is controlled to be opened at a preset angle, and a fan is controlled to operate at a first rotating speed; whether the actual temperature in the cold storage chamber is smaller than or equal to the first turn-off temperature is judged, the actual temperature in the freezing chamber is larger than the second shut-down temperature, and if yes, the air door is controlled to be closed and the fan is controlled to operate at a second rotating speed. According to the scheme, by shortening the negative pressure time of the cold storage chamber and reducing the negative pressure degree of the cold storage chamber, the condensation phenomenon in the cold storage chamber can be effectively relieved, and the problem that condensation affects the service life and the refrigeration effect of the refrigerator is avoided.

The invention discloses a method and device for testing the heat dissipation performance of a radiator assembly and belongs to the field of performance testing of an automobile cooling system. The method includes the first step of determining operating parameters of the radiator assembly under a real vehicle working condition through an engine and gearbox bench test, the second step of enabling the radiator assembly to simulate the real vehicle working condition to carry out testing on a wind tunnel and determining testing operating parameters of the wind tunnel of the radiator assembly on the premise of the first step, the third step of determining heat dissipation performance parameters of the radiator assembly according to the operating parameters under the real vehicle working condition and the testing operating parameters of the wind tunnel, and the fourth step of comparing the heat dissipation performance parameters with standard heat dissipation performance parameters, and determining that the radiator assembly meets the heat dissipation requirements of an engine and a gearbox if the heat dissipation performance parameters are larger than the standard heat dissipation performance parameters. Through the method and device, the real vehicle working condition can be simulated, and heat dissipation performance testing can be carried out on the radiator assembly with a built-in oil cooler, so operating parameters of the oil cooler and the operating parameters of a radiator can be accurately matched, and the accuracy degree of the heat dissipation performance parameters of the radiator assembly can be improved.

The invention relates to a control device of a variable-displacement compressor of an air conditioner, and the control device comprises an internal temperature control module, an air-out temperature control module and a compressor control module. The internal temperature control module calculates the target air-out temperature at least on the basis of the set temperature of the air conditioner as well as the temperature inside a car and the temperature outside the car. The air-out temperature control module calculates the target temperature of an evaporator on the basis of the temperature outside the car, the set temperature of the air conditioner and the temperature inside the car, and the target temperature of the evaporator is approximate to the target air-out temperature; the compressor control module comprises an evaporator temperature control unit which controls the displacement of the compressor by adopting a PID (Proportion Integration Differentiation) control algorithm on the basis of the target temperature of the evaporator and the currently measured temperature of the evaporator. The control device of the variable-displacement compressor of the air conditioner accurately controls the electric current of an electric control valve of the compressor fully based on the target temperature of the evaporator and the current temperature of the evaporator, so as to achieve the purpose of the accurate displacement of the compressor, and the refrigeration effect of the air conditioning system achieves expectation of users as soon as possible and stabilizes afterwards.

The application provides a water pump control method and system of an air conditioner cooling system and a household central air conditioner. The control method and system are applied to the household central air conditioner which performs cooling by using water. The method and the system are characterized in that firstly inlet and outlet water temperature difference between a water inlet and a water outlet of the air conditioner cooling system is obtained; then the inlet and outlet water temperature difference is respectively compared with a preset inlet and outlet water temperature difference upper limit and a preset inlet and outlet water temperature difference lower limit; if the inlet and outlet water temperature difference is smaller than the inlet and outlet water temperature difference lower limit, the rotating speed of a water pump is reduced; if the inlet and outlet water temperature difference is greater than the inlet and outlet water temperature difference upper limit, the rotating speed of the water pump is increased; if the inlet and outlet water temperature difference is between the inlet and outlet water temperature difference lower limit and the inlet and outlet water temperature difference upper limit, the current rotating speed of the water pump is maintained. By adaptively adjusting the rotating speed of the water pump through a judgment result of the inlet and outlet water temperature difference, when the inlet and outlet water temperature difference is smaller than the preset inlet and outlet water temperature difference lower limit, the rotating speed of the water pump is reduced at proper time and thus the overall energy consumption of the central air conditioner system can be reduced.

The invention discloses a natural cooling air-cooled chiller unit, a control method, a control device and an air-conditioner system of the chiller unit. The natural cooling air-cooled chiller unit comprises a compressor, a check valve, a condensing device, a variable frequency fan, a solenoid valve, an electronic expansion valve, a refrigerant pump and an evaporator, wherein the condensing device comprises an air-cooled condenser and the variable frequency fan; the output end of the compressor and the output end of the check valve are both connected with the input end of the air-cooled condenser; the output end of the air-cooled condenser is connected to the input end of the solenoid valve and the input end of the electronic expansion valve; the output end of the solenoid valve is connected to the input end of the refrigerant pump; the output end of the refrigerant pump and the output end of the electronic expansion valve are both connected to the input end of the evaporator; the output end of the evaporator is connected to the input end of the compressor and the input end of the check valve; in this way, a first refrigerating circulation and a second refrigerating circulation are formed. With the technical scheme provided by the invention, the accurate control on the refrigeration circulations is realized, and the reliability of the natural cooling air-cooled chiller unit is improved.

The invention discloses a method and device for controlling a fan of a server. The method for controlling the fan is applied in a baseboard management controller (BMC) and comprises the steps that a temperature of the environment where the server is located is obtained; the environment temperature and a high temperature warning value is compared, wherein if an environment temperature value is larger than the high temperature warning value, a fan weight strategy corresponding to whole server cooling is called from a preset first database, and if the environment temperature value is smaller thanthe high temperature warning value, according to an obtained device temperature of a target power device in the server, a fan weight strategy corresponding to cooling of the target power device is called from a preset second database. According to the method and the device, according to change of the temperature of the environment where the server is located and the device temperature of the target power device, the fan weight is dynamically adjusted, so that the cooling requirements under different running working conditions are met, and the energy saving capacity and the adaptive capabilityto the environment of the server reach optimal states.

The invention relates to a multi-ejector parallel type solar ejecting refrigeration unit which utilizes solar energy to supply cold air, which comprises a solar hot-water loop, an ejecting refrigerant loop and an air conditioner water loop. The unit solves the problems that the prior ejecting refrigeration system is only provided with an ejector, the structural dimension of the ejector is fixed and the efficiency of an ejector system is drastically declined directly because operation condition is derivated from design condition. The unit is arranged between a generator and a condenser, and is provided with two or more than two ejectors with different structural dimensions in parallel. The multiple ejectors can meet high-efficiency operation of variable working conditions; and the unit can automatically or manually switch to a proper ejector for working according to solar radiation or weather changing conditions, further ensure that the system operates in refrigeration season with high efficiency, can improve the operation efficiency of the solar ejector system, and realize the aim of supplying the cold air with high efficiency and reasonability, thereby improving the utilization rate of solar energy, saving energy, relieving the pressure of electricity grid at the peak time, and improving the light-heat utilization efficiency.

The invention discloses a control method for an outdoor fan of an air conditioner. The control method comprises the following steps that the air conditioner operates in a refrigeration manner, and the outdoor environment temperature T4 is detected; when the outdoor environment temperature T4 is lager than the preset environment temperature i, the outdoor fan is controlled to be kept in the current positive rotation state; when the outdoor environment temperature T4 is smaller than the preset environment temperature i, the rotating speed of the outdoor fan and a detection object are detected, and the detection object is at least one of the running frequency F of a compressor, the temperature T3 of an outdoor heat exchanger and the pressure PL in an indoor heat exchanger; when the rotating speed of the outdoor fan is the preset rotating speed and the detection result of the detection object meets the preset conditions, the outdoor fan is controlled to do reverse rotation motion; and when the rotating speed of the outdoor fan is higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, the outdoor fan is controlled to be kept in the current positive rotation state. According to the control method, the air volume of the outdoor fan is lowered, the pressure of the condensation side is increased, and the air conditioner can output refrigerating capacity continuously.

The invention discloses a fan; the fan comprises a distance detection module, a temperature detection module, an electric motor, and an electric control module; the distance detection module is used for detecting the distance between a user and the fan; the temperature detection module is used for detecting the environmental temperature; the electric control module is respectively connected with the distance detection module, the temperature detection module and the electric motor; the electric control module controls the rotation speed of the electric motor based on the distance between the user and the fan as well as the environmental temperature, so as to regulate the wind speed of the fan. The fan is able to automatically adjust the rotation speed of the electric motor based on the distance between people and the fan as well as the environmental temperature, so as to achieve an intelligent switchover, thereby enabling the wind speed to change with the change of the distance between people and the fan, and also change with the change of the environmental temperature, enable the user to feel the most comfortable wind speed, thereby increasing the comfort level of the user and completely meeting the requirements of the user. Additionally, unnecessary electric energy waste can be avoided in the premise of meeting the requirement of cooling, thus effectively saving the electric energy. The invention further discloses a control method of the fan.

The invention provides a method for designing a bonding pad of a surface mounted component. The method comprises the following steps of: modifying a design structure of a radiating bonding pad in the center of the surface mounted component, and dividing a solder mask of the bonding pad into N equal parts according to the size of the radiating bonding pad of the surface mounted component, so that the lengths or widths of the divided solder masks of the bonding pad range from 2 to 3 millimeters; and arranging a through hole array at adjacent positions of the equal parts of the divided solder masks of the bonding pad. By the method, the problem of the offset or sliding caused in the process of processing the surface mounted component by a backflow welding process is solved, and the radiating requirement of chips is met.

The invention discloses a satellite-borne high-power power conditioning unit platform of an extensible structure. The satellite-borne high-power power conditioning unit platform of the extensible structure comprises a plurality of function modules, remote control and remote measurement flex-rigid printed boards, main error amplifier EMA modules, complete machine bus bars, an upper cover plate, a rear cover plate and side cover plates, wherein the function modules comprises the charge-discharge conditioning modules, the shunt conditioning modules and the remote control and remote measurement modules, the number of the charge-discharge conditioning modules and the number of the shunt conditioning modules are determined according to a power design objective, the main body of each function module is of a wholly-hollowed-out pentahedron structure, the side cover plates are installed after all the function modules are vertically arranged in a stacked mode, every two adjacent function modules are connected with each other through a protruding lug, each remote control and remote measurement flex-rigid printed board is installed in a cavity in the top of the corresponding function module, each error EMA module and each complete machine bus bar are installed in two cavities in the back side of the corresponding function module respectively, and the overall arrangement of the interior of each function module is layered and three-dimensional. The satellite-borne high-power power conditioning unit platform of the extensible structure can meet the environmental testing requirement of satellite-borne electronic equipment and can also meet the heat radiating requirement of a complete machine.

The invention relates to an air conditioner with variable cooling capacity. The air conditioner is used for adjusting the temperature of a cabinet and comprises a control system, a compression refrigeration system and a fresh air refrigeration / harmful gas discharge system, wherein the compression refrigeration system comprises a compressor, an evaporator, a condenser, an evaporation blower and a condensation blower; the fresh air / harmless air discharge system comprises a throttle component, an evaporation blower and a condensation blower; the throttle component comprises a throttle motor and a throttle which can be driven by the throttle motor and is switched between a first state and a second state; the rotation speeds of the compressor, the condensation blowers and the evaporation blowers are adjustable; the control system can adjust the compressor, the condensation blowers and the evaporation blowers in a direct proportion according to calorie values in the cabinet and / or different seasons to be operated in different rotation speeds, so as to provide different cooling capacity. By virtue of adjusting the speeds of the compressor, the evaporation blowers and the condensation blowers, the air conditioner with variable cooling capacity can provide different cooling capacity choices and meet different refrigeration demands.

The invention discloses a refrigeration system which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a compressor, a first indoor heat exchanger and a second indoor heat exchanger; the outdoor unit comprises an outdoor heat exchanger; an exhaust port of the compressor is connected with one end of the outdoor heat exchanger; the other end of the outdoor heat exchanger is connected with one end of the first indoor heat exchanger; the other end of the first indoor heat exchanger is connected with a gas returning port of the compressor, so that a loop in an air conditioning mode is formed; the second indoor heat exchanger is lower than the outdoor heat exchanger; one end of the second indoor heat exchanger is connected with one end of the outdoor heat exchanger; and the other end of the outdoor heat exchanger is connected with the other end of the second indoor heat exchanger, so that a loop in a heat tube mode is formed. The invention further discloses a refrigeration method of the refrigeration system. The technical scheme meets cooling requirements at different temperatures of working conditions, the refrigeration efficiency is improved, and the purchase cost of equipment is reduced.

The invention provides a light-emitting diode (LED) display screen and an LED display device and belongs to the technical field of LED display. The LED display screen comprises a mask, a lamp panel, a heat conduction base plate, a rear panel, a control panel and a casing, wherein the mask, the lamp panel, the heat conduction base plate and the rear panel are sequentially overlapped, and the casing is covered on the control panel and fixed on the rear panel. The LED display device is formed by connecting a plurality of the LED display screens by the aid of connecting pieces and connecting piece groups. According to the light-emitting diode (LED) display screen and the LED display device, a boss is arranged on the surface of the mask, so that LEDs on the lamp panel are well protected, less light is shielded, and visual angles of the LEDs are broadened; besides, the heat conduction base plate is added, so that even if a chip is protruded on the rear surface of the lamp panel, hole punching processing is not required to be performed to the rear panel, and the production efficiency of products is greatly increased; and a radiating hole and a radiating port are arranged on a rear casing, the whole casing is ventilated, accordingly, air circulation inside and outside the casing is facilitated, the radiating effect is enhanced, and the control panel is subjected to waterproof treatment in consideration of waterproof issues.

The invention discloses a centrifugal fan set used for cooling a high speed train traction motor. The centrifugal fan set comprises a collector, flanges, a fan impeller, a volute, a shaft disc and an electromotor and is characterized in that the collector is fixed on one side of an end plate of the volute through the flanges, the volute is fixed on the electromotor, the fan impeller which is arranged in the volute is fixed with the shaft disc, an installation hole which is matched with a motor shaft of the electromotor is formed in the shaft disc, and the shaft disc is fixed with the electromotor. According to the centrifugal fan set, on the premise that the appearance size of the product is not changed, the difficult problems that the static pressure is not enough and the weight excesses limitation are solved, the required technical requirement which needs to be met when the high speed train traction motor runs is met, performance and reliability of the traction motor are improved, and the centrifugal fan set has the advantages of being high in efficiency, high in reliability, simple and compact in structure, low in noise and the like.

The invention relates to the field of engineering machinery, and discloses a vehicle cooling system, a control device and a control method of the vehicle cooling system, and engineering machinery. The vehicle cooling system comprises a heat radiator, a first fan, a second fan, an engine cooling pipeline and a hydrodynamic retarder cooling pipeline, wherein the first fan is arranged in a first cooling area of the heat radiator; the second fan is arranged in a second cooling area of the heat radiator; the engine cooling pipeline is connected with the hydrodynamic retarder cooling pipe to form a cooling loop; and the cooling loop is provided with a cooling liquid outlet and a cooling liquid inlet which are respectively communicated with the outlet end and the inlet end of the heat radiator. Compared with the prior art, the cooling effect of the vehicle cooling system can meet cooling requirements under different situations, so that the cooling ability of the system can be guaranteed, the cooling efficiency of the system is improved, and unnecessary energy waste is avoided; in addition, the vehicle cooling system is low in cost and occupies a small space.

The invention relates to an overflowing fanning strip for strengthening cooling of a motor stator. The novel overflowing fanning strip is arranged between stator core sections in a whole-circle way to form a stator ventilation channel, and fluid flowing through the stator ventilation channel can cool a stator coil and a stator core. The ventilation channel forms a plurality of overflowing areas with alternate compression and expansion at a tooth part through broken line overflowing channel steel. Local fluid whirl generated in the overflowing areas is utilized to strengthen the cooling effect of the stator coil and the stator core, the fluid can take away more consumed heat, and the temperature of each heating component is reduced. In addition, the broken line overflowing channel steel enables the wind resistance of the ventilation channel to be higher, so that the total wind volume declines, the ventilation consumption is reduced, and the efficiency of a motor is improved. Through improvement of the cooling effect, the cooling demand of the motor can be met greatly, and greater economic benefits are brought to users through the efficiency improvement.

The invention provides a method for controlling refrigeration of a variable frequency air conditioner. The indoor air conditioner comprises two evaporators connected in parallel, two draught fans corresponding to the two evaporators and two air blowout units corresponding to the two draught fans respectively. Each air blowout unit includes at least one air outlet. The refrigeration control methodconsists of the steps that the indoor target temperature Ta, the interior environmental temperature Tb, the outdoor environmental Tc and the coil pipe temperature of two evaporators should be detectedwhile the air conditioner is operating in a refrigeration mode, wherein the lower value of coil pipe temperature is marked as Td; the on-or-off state of the two draught fans is detected; the operating frequency of compressors is determined by Td temperature range and the value of Ta, Tb, Tc if both draught fans are in service; and the operating frequency of compressors is decided by temperature difference range of Tb, Ta and the value of Ta, Tb, Tc if only one draught fan is on. The method not only makes air conditioners capable of meeting the cooling needs, but also protects the evaporatorsfrom frost by controlling the operating frequency of compressors accurately.

The invention provides a water-cooling pipe, a motor housing and a manufacturing method thereof. The motor housing comprises a housing body and a water-cooling pipe, wherein the water-cooling pipe is arranged in the housing body; the water-cooling pipe comprises two ports; the housing body comprises an inlet and an outlet; the two ports of the water-cooling pipe are arranged at the inlet and the outlet respectively; the water-cooling pipe is in a spiral form and is made of a copper material; and at least one support body is arranged between copper pipes of the water-cooling pipe. The manufacturing method of the motor housing comprises the following steps: (1) installing the spiral water-cooling pipe between a left metal die and a right metal die; (2) preheating the water-cooling pipe to 300-350 DEG C; (3) heating aluminum to 700-850 DEG G, and then adding 6.5%-7.5% of Si, 0.2%-0.4% of Mg and 0.03%-0.07% of La to obtain a molten aluminum alloy; (4) filling a mold cavity between the left metal die and the right metal die with the molten aluminum alloy, wherein the casting temperature is 700-720 DEG C; (5) after the molten aluminum alloy is hardened, separating the left die from the right die and obtaining a motor housing blank; and (6) carrying out artificial aging treatment on the motor housing blank.

The invention discloses a temperature humidity dual control variable refrigerant flow air conditioning system and a control method thereof, wherein the temperature humidity dual control variable refrigerant flow air conditioning system comprises multiple indoor units, an outdoor unit and a control module; the outdoor unit is provided with a first interface and a second interface; each indoor unit comprises an indoor throttle, a first heat exchanger, a second heat exchanger, a first solenoid valve, a second solenoid valve, a third solenoid valve, a temperature detection module and a humidity detection module; the control module controls the temperature humidity dual control variable refrigerant flow air conditioning system by controlling the indoor throttle valve, the first solenoid valve, the second solenoid valve and the third solenoid valve in each indoor unit. The temperature humidity dual control variable refrigerant flow air conditioning system and the control method thereof meet the temperature humidity dual control requirement without influencing normal refrigerating and heating performances, and fully meet user demands.