117results about How to "Stable indoor temperature" patented technology

The invention discloses a dynamic climate compensation method for centralized heating. Firstly, the outdoor temperature is predicted, water supply and return temperatures are adjusted some time ahead according to the predicted value of the outdoor temperature, and the hysteresis of pipe network adjustment in the manner that adjustment is performed while sampling is overcome. The outdoor temperature of the next day is predicted according to local historical meteorological data and weather forecast of the meteorological department, and the value is used as basic data for prediction of a thermal load; and then the thermal load is predicted, that is, the thermal load curve of the next day is calculated according to the outdoor temperature. With the method, the outdoor temperature is reasonably predicted so as to realize advanced dynamic adjustment of a climate compensator; heating medium parameters of a heating system are adjusted by the aid of an adjusting model according to the thermal load value set in advance, a heat source is changed from original wide passive heating into active heating, on the premise that the indoor temperature for the user is stable, the operation adjusting indictor of the heating system within the specified time are given in advance, the heating efficiency is improved, and the heating energy consumption is reduced.

The present invention is automatic volume regulating and controlling method for heat pump in gas-burning machine, and belongs to the field of volume regulating technology for heat pump in gas-burning machine. The automatic volume regulating and controlling method includes the macro regulation and control of the mixed control system with rotation speed of the gas-burning machine as target, the intake valve of the gas-burning machine as executing mechanism, the predicted value of building load as main feedforward parameter and building indoor temperature as control feedback parameter; and the micro egulation and control of the mixed control system with the opening of the electronic expansion valve as the regulating target, the step motor as the executing mechanism, the rotation speed of the gas-burning machine as the feedforward parameter and the system overheat degree as the feedback parameter. The present invention has automatic running control of heat pump set in high energy utilizing rate.

The invention discloses a fresh air machine with a temperature compensation function and relates to the field of air purification. The fresh air machine comprises an outdoor unit and an indoor unit, the outdoor unit is a heat exchange system comprising a compressor, and the indoor unit is an air purification adjustment portion and comprises an air quality testing portion, an air purification portion and a temperature adjustment portion; the air quality testing portion comprises a PM (particulate matter) 2.5 sensor, a TVOC (total volatile organic compound) sensor, a CO2 sensor, a temperature and humidity sensor and the like; the air purification portion comprises an initial effect filter, an electrostatic dust collector, an activated carbon filter, an efficient filter and a light catalyst component; the temperature adjustment portion refers to heat exchange fins connected with the outdoor unit. Indoor air can be purified manually or according to indoor air quality testing values, the indoor air temperature can also be regulated, air is purified, and meanwhile, comfortable temperature is provided.

The invention discloses a control method for a wall-mounted frequency conversion air conditioner. The control method includes the steps that when a received air conditioner control instruction is a refrigeration energy conservation comfortable instruction and when the current room temperature is larger than or equal to the set room environmental temperature threshold value, the frequency conversion air conditioner is controlled to operate according to an original frequency conversion control manner of the frequency conversion air conditioner; otherwise, the compressor target frequency worked out according to the original frequency conversion control manner is obtained, and whether the compressor target frequency is smaller than the first set compressor frequency or not is judged; if yes, a compressor is controlled to operate at the first set compressor frequency, and an outdoor fan is controlled to operate at a set rotating speed; if not, the compressor and the outdoor fan are controlled to operate according to the original frequency conversion control manner. In the original frequency conversion control manner, room temperature PID control over or fuzzy control over the compressor are conducted, and the room temperature is compensated in the room temperature PID control. By the application of the control method, energy conservation and refrigeration comfort of the air conditioner are improved.

The invention discloses a defrosting control method, which comprises the steps of when an air conditioner operates at a heating mode, judging whether defrosting is required or not; if defrosting is not required, controlling the air conditioner to keep at the heating mode; if defrosting is required, controlling the air conditioner to switch the heating mode into a defrosting mode, controlling an operating mode of a four-way valve to be unchanged, controlling a compressor and an indoor fan to work continuously, switching on a refrigerant heating device to heat a refrigerant flowing into a condenser, and switching off an outdoor fan; and when the air conditioner is at the defrosting mode and reaches first preset time, switching off the refrigerant heating device, switching on the outdoor fan, and controlling the air conditioner to operate according to parameters corresponding to the heating mode. The invention further discloses a defrosting control device and the air conditioner. According to the defrosting control method, the defrosting control device and the air conditioner provided by the invention, during a whole heating, defrosting and heating period operation process, the compressor operates continuously, and the refrigerant continuously releases heat indoors when flowing through an evaporator, so that indoor temperature can remain stable.

The invention discloses a control method for a wall-mounted inverter air-conditioner. The control method comprises the steps: when a received air-conditioner control instruction is a refrigeration energy conservation and comfort instruction, and when the current room temperature is not lower than a preset room environment temperature threshold, the inverter air-conditioner is controlled to operate according to an original inverter control mode of the inverter air-conditioner; or else, a compressor target frequency calculated according to the original inverter control mode is obtained, and the compressor target frequency is judged to be smaller than a first preset compressor frequency or not; if yes, a compressor is controlled to operate with the first preset compressor frequency, and an outdoor fan is controlled to operate with a preset rotation speed; and if not, the compressor and the outdoor fan are controlled to operate according to the original inverter control mode. In the original inverter control mode, room temperature PID (Proportion Integration Differentiation) control or fuzzy control is performed on the compressor, and room temperature is compensated during room temperature PID control. By adopting the control method, the energy-saving performance and refrigeration comfort of the air-conditioner are improved.

The invention relates to a vertical fresh air fan for heat recovery, comprising a cabinet, wherein an independent fresh air suction area, a secondary fresh air filtering area, a fresh air discharge area, a stale air discharge area, a stale air suction air and a heat exchange area are arranged in the cabinet; a first filter used for filtering outdoor air is inlaid in the fresh air suction area; an electrostatic precipitator and a fresh air fan are inlaid in the secondary fresh air filtering area, wherein the electrostatic precipitator is used for filtering fresh air passing through the first filter again, and the fresh air fan is used for discharging the fresh air passing through the electrostatic precipitator to the fresh air discharge area; a second filter used for carrying out third level of filtering on the fresh air discharged from the fresh air fan is inlaid in the fresh air discharge area; an exhaust fan used for discharging indoor stale air to the outside is inlaid in the stale air discharge area; and a plate heat exchanger used for carrying out energy exchange between the fresh air and / or the stale air is inlaid in the heat exchange area. The fresh air fan is high in filtering efficiency, capable of preventing blockage, large in fresh air inlet space, good in energy saving effect and strong in universality.

The invention discloses an air conditioner control method. The method includes: when a received air conditioner control instruction is an energy-saving comfortable refrigeration instruction and a current indoor temperature is not lower than a set indoor environment temperature threshold, controlling a variable-frequency air conditioner to operate according to an original variable-frequency control mode of the variable-frequency air conditioner; otherwise, acquiring a compressor target frequency calculated according to an original variable-frequency control mode, and judging whether the compressor target frequency is smaller than a first set compressor frequency or not; if yes, controlling the compressor to operate by the first set compressor frequency, and controlling an outdoor fan to operate by a set rotating speed; if not, controlling the compressor and the outdoor fan to operate according to the original variable-frequency control mode; in the original variable-frequency control mode, executing room temperature PID control or dual PID control including coil temperature PID control on the compressor, wherein a coil target temperature adopted in coil temperature PID control is determined according to real-time indoor humidity. By application of the air conditioner control method, energy saving and refrigeration comfort of the air conditioner are improved.

The invention relates to a combination heat storage and heating furnace. It includes stove, burner, combustion fan, kitchen ventilator, condensation purifier, water supply pipe, water drainage pipe, and furnace controller. The feature is that the heat gathering cover is set on the burner, smoke switch valve is set on smoke outlet tubing head, gas to gas heat exchanger and gas to water heat exchanger are set in the whole heat exchanger channel, floating ball water-level controller and hot water pipe bundle are set in hot water storage tank, balance smoke discharging apparatus is set on the top of the kitchen ventilator to exhaust gas and take in fresh air. The front of the kitchen ventilator sets fresh air switch valve and wind forming device. The invention assembles several heat exchangers to combines hot water supply and warming.

The invention provides a control method for a double-throughflow air conditioner. The control method comprises a detection step, a judgment step and a control step. The detection step is used for detecting indoor environment temperature t and for detecting whether the double-throughflow air conditioner is in a refrigeration mode or a heating mode. The judgment step is used for judging whether theindoor environment temperature t and a preset temperature value T0 meet the relation that t1 error<|t-T0|<=t2 error after the air conditioner is started for preset time. According to the control step,when t1 error<|t-T0|<=t2 error, the rotation speed N1 of a first motor is controlled to be N1max, the rotation speed N2 of a second motor is controlled to be N2min, or the rotation speed N1 of the first motor is controlled to be N1min, the rotation speed N2 of the second motor is controlled to be N2max, wherein N1max is the preset maximum rotation speed of the first motor, N2max is the preset maximum rotation speed of the second motor, N1min is the preset minimum rotation speed of the first motor, and N2min is the preset minimum rotation speed of the second motor. Through the control method,on the premise that the requirement of a room load is met, air-feeling-free air supply enjoyment is really brought to a user, and the comfort level of a human body is increased.

The invention relates to heating control technologies, aims to solve the problem that the existing air source heat pump hot water unit causes poor indoor temperature stability due to change of external environment temperatures, and provides a heating control system and method. According to the technical scheme, the heating control system comprises a processing unit and a temperature acquisition module and a setting module, wherein the temperature acquisition module and the setting module are connected to the processing module, and the setting module is used for a user to set an initial set temperature of a water tank according to the demand of the indoor temperature; the temperature acquisition module is used for acquiring an current external environment temperature and a current water temperature of the water tank; the processing module is used for connecting a controlled water tank. The needed indoor temperature is obtained according to the initial set temperature and the current external environment temperature, when the heating control system runs, a corresponding water tank target temperature is obtained according to current external environment processing, the water temperature in the controlled water tank is adjusted to a target temperature of the water tank, and thus the indoor temperature is kept at the needed indoor temperature. The heating control system and method has the advantages of bringing convenience to users, and the system is suitable for the air source heat pump hot water unit.

The invention relates to a climate compensation controller of a heating system. The heating system comprises a heat source and a plate heat exchanger. The climate compensation controller comprises a control module, a human machine interface module, an A / D converter and a temperature sensor, wherein the human machine interface module is connected with the communication interface of the control module; the A / D converter is connected with the input and output interface of the control module; and the temperature sensor is connected with the input interface of the A / D converter. The heat source is connected with the plate heat exchanger through a water supply pipe and a water-returning pipe; a bypass pipe is arranged between the water supply pipe and the water returning pipe; a solenoid valve is arranged at the connection place of the water supply pipe, the bypass pipe and the plate heat exchanger; and the solenoid valve is connected with the output interface of the A / D converter. The climate compensation controller of the heating system provided by the invention can adjust the temperature of the outlet water of the heat supply in real time according to the dynamic change of outdoor climate to keep the indoor temperature stable and comfortable. The climate compensation controller is the climate compensation controller with advanced control technology, which reduces the fuel consumption at the warm climate.

The invention discloses a floor heating system with a variable-frequency air source heat pump. The floor heating system is characterized by comprising a variable-frequency air source heat pump host machine, a variable-frequency internal machine and a radiant floor heating system arranged below indoor floor, wherein the variable-frequency air source heat pump host machine internally comprises a variable-frequency compressor and variable-frequency electric control equipment, and a refrigerant backflow connector and a refrigerant output connector are arranged on the variable-frequency air source heat pump host machine; the radiant floor heating system comprises a water pipe, the water pipe is arranged at the bottom of the floor and arranged into an S shape, a water inlet of the S-shaped water pipe is connected with a floor heating water supply pipe, and a water outlet of the S-shaped water pipe is connected with a floor heating water return pipe; a plate heat exchanger, a water pump and indoor electric control equipment are arranged on the variable-frequency internal machine. The floor heating system with the air source heat pump has the advantages of super-high energy efficiency, good environment friendliness, high safety, comfort, the capability of realizing intelligent control and the like.

The invention relates to the technical field of air conditioners, in particular to an embedded air conditioner, an air discharging control method thereof and a computer readable storage medium. The invention aims to solve the problem that because the embedded air conditioner cannot control the air supply intensity based on the number of indoor persons, the energy waste is caused. To achieve the purpose, the air discharging control method comprises the following steps that 1, in the operation process of the embedded air conditioner, the number of the persons in the indoor environment is obtained; 2, whether a person exists indoors or not is judged based on the number of the persons; 3, when no person exists indoors and the duration of the no-person state is larger than or equal to a presettime threshold value according to the judgment result, the embedded air conditioner is controlled to run in an energy-saving mode; and 4, when the embedded air conditioner operates in the energy-saving mode, the opening and closing of an air deflector and the rotating speed of a fan are controlled based on the duration of the no-person state. According to the air discharging control method, the air discharging intensity can be reasonably adjusted based on the number of the indoor persons, the air conditioner energy consumption when no person exists indoors is reduced, and the energy waste is avoided.

The invention discloses a control method for improving the stability of a heating process of an air conditioner, and relates to an air conditioner performance control method. The control method comprises the steps that when the air conditioner runs in a heating mode, the outdoor environmental temperature, the outdoor environmental humidity and the temperature of a coiler of a heat exchanger of anoutdoor unit are obtained; by comparing the temperature of the coiler of the heat exchanger of the outdoor unit with a temperature interval preset value, a capillary network control valve is controlled to be started; after a pipe network branch is started, the maximum opening time of a pipe network is determined according to the obtained outdoor environmental humidity; according to the temperatureof the coiler of the heat exchanger of the outdoor unit, a defrosting exit temperature preset value and the maximum opening time of the pipe network, the air conditioner is controlled to exit from the defrosting mode. The problems are solved that in an existing defrosting process, heating output is interrupted, and the whole heating capacity is reduced; when the heat exchanger of the outdoor unitis defrosted, a refrigerant circulating system can be little affected, the heating capacity in the process is ensured so as to maintain indoor temperature smooth, and no additional energy consumptionis increased.

The invention discloses an energy-storage air conditioning system which includes an energy reserving device, a heat pump outdoor unit, a first circulation pipe, a heat exchanger, an energy circulation device, a second circulation device, an accumulator and a controller, which are connected with each other. Compared with the prior art, the heat exchange system of the invention can store the energy, except for the satisfying the requirement in the temperature when the electricity is out, so that the energy exchange can be achieved to keep the stability of the indoor temperature through the driving of a circulation pump and a fan coil by utilizing the energy provided by solar batteries when the electricity is out. Thereby, a great amount of cost is saved for the users. In addition, the system does not change the cleanness, humidity and other indexes in the room and overcomes the disadvantages that in the prior art, an extra dynamo is needed when the electricity is out, thereby having no increased cost and unnecessary waste of the energy.

The invention provides a real-time air purification and disinfection system for a public areas and a disinfection method of the real-time air purification and disinfection system. In the process of purifying and disinfecting the air in the public place through a plasma treatment module by the air purification and disinfection system, a carbon dioxide online detection module and an ozone online detection module are used for monitoring the content of carbon dioxide and the content of ozone in air in the public place in real time, fresh air is supplemented in time, air pollution is avoided, the health of indoor personnel and the safety of cardiovascular disease patients are guaranteed; if the air purification disinfection system is popularized and used in a large range, public health safety of public places such as schools and hospitals can be effectively guaranteed, cross infection of virus and bacteria and the like is avoided, large-area infection shutdown and class halt in autumn and winter are prevented, the phenomenon that most people frequently and massively use antibiotics due to fear of infection can be further effectively avoided, drug resistance of bacteria is prevented, anda large amount of national fund for health and epidemic prevention is saved.

The invention provides a multi-fan air conditioner defrosting method and an air conditioner. The air conditioner defrosting method is used for a multi-fan air conditioner, and comprises the steps of acquiring a current indoor ambient temperature; calculating the difference value Delta T between the current indoor ambient temperature and a user preset ambient temperature; comparing the Delta T witha preset temperature difference value Delta T0 under a hot air defrosting condition to determine whether a hot air defrosting condition is satisfied or not; and if the hot air defrosting condition issatisfied, at the time, reducing the air outlet amount per unit time of an upper air outlet and a lower air outlet, and making the air outlet amount per unit time of the upper air outlet less than the air outlet amount per unit time of the lower air outlet to enter a defrosting mode. According to the multi-fan air conditioner defrosting method and the air conditioner, the problems of great indoorambient temperature fluctuation and poor body sense of user caused during defrosting process of the air conditioner are solved.

The invention discloses a building temperature control method and system based on model predictive control. Based on model predictive control (MPC), the method performs heat supply temperature adjustment, adds prediction of interference in predictive control, and compensates for upcoming ambient temperature changes. The system comprises: an MPC controller for maintaining the room temperature of abuilding at a determined most comfortable temperature value and calculating an optimal heat supply temperature value; a PID controller used for controlling an executing mechanism to respond accordingto the optimal heat supply temperature value and the secondary side water supply and return temperature; an executing mechanism for adjusting the primary side hot water flow of a heat exchanger and controlling the temperature of secondary side hot water through the heat exchanger; a first temperature sensor for collecting the temperature of the secondary side hot water of the heat exchanger and sends the temperature to the PID controller; and a second temperature sensor used for collecting the indoor real-time temperature of the building and sending the indoor real-time temperature to the MPCcontroller. According to the method and the system, the indoor temperature is more stable, the comfort level of a user is improved, and the heat supply energy consumption is remarkably reduced.

The invention relates to the technical field of refrigerators in electrical equipment, particularly a refrigerator with Sabbath function and a control method thereof. The refrigerator with Sabbath function comprises a main control panel module, a refrigerator cold storage chamber temperature sensor connected with the main control panel module, a refrigerator freezing chamber temperature sensor, a compressor, a cold storage door switch detection device, a freezing door switch detection device, a blower and an electric throttle. By adopting the intelligence learning mode, the working mode of the refrigerator is learned, so that the optimum control mode is automatically called after entering the Sabbath mode; and thus, under the condition of not using various sensors, the invention can ensure the indoor temperature in the refrigerator chamber to stay in an ideal state when the external temperature is higher or lower, thereby well preserving food.

The method for determining temperature of return water of central heating system is characterized by that according to the circulating water flow of heating system and outdoor maximum air temperatureand minimum air temperature the "return water temperature-circulating water flow-outdoor temperature" curve diagram can be drawn, then according to indoor and outdoor temperatures said curve diagram can be looked over to determine the temperature of return water of said centre heating system, said invention also provides the principle and method for drawing said curve diagram, and can attain the goal of ensuring heating temperature, saving energy, reducing consumption and reducing pollution.

The invention discloses a mechanical defrosting device for an outdoor flat plate type heat exchanger of an air source heat pump system. The mechanical defrosting device comprises the outdoor flat plate type heat exchanger which consists of coiled tubes as well as a framework, a brush head straight rod, a motor, a gear, a frame rail, a frame, a rack and a defrosting brush head which are fixedly equipped with the heat exchanger. According to the mechanical defrosting device disclosed by the invention, the surface of the flat plate type heat exchanger is wavy, so that heat transfer area of the heat exchanger can be effectively improved; and an arc-shaped brush head is correspondingly adopted to be matched with the surface of the heat exchanger better, so that defrosting efficiency is remarkably improved. The mechanical defrosting device is adopted, so that a frost layer can be quickly and effectively removed with low energy consumption when the air source heat pump system continuously and normally operates, and therefore, heating effect of the system is improved, and the indoor temperature is kept stable.

The invention provides a multi-split defrosting method and device, a multi-split air conditioner system and a readable storage medium. The multi-split defrosting method comprises the steps that the state of an indoor unit is judged, and the state comprises shutdown and unmanned startup; the capacity volumes of the indoor unit and an outdoor unit are obtained after the state is judged, the sum of the capacity volume of the indoor unit which is shut down and the capacity volume of the indoor unit which is not started up is calculated, and the ratio of the sum of the capacity volumes to the capacity volume of the outdoor unit is calculated; and the indoor unit is controlled to enter a corresponding defrosting mode according to the ratio. The state of each indoor unit of the multi-split air conditioning system can be analyzed, the actual use condition of the multi-split air conditioning system is represented through the capacity volume ratio related to the state of each indoor unit, defrosting control is carried out according to the actual operation condition, so that the defrosting control can be fit with the actual use condition of the multi-split air conditioning system, the indoor temperature is kept stable as much as possible during defrosting, and the thermal comfort experience of a user is guaranteed.

The invention provides an indoor unit of a fresh air conditioner. A fresh air device is additionally arranged on the traditional air conditioner indoor unit, so outdoor air can be introduced into a room through the fresh air device even if a window is closed during the cooling or heating process of the air conditioner, continuous and fresh air can be provided for a closed indoor space, the oxygencontent of the indoor air can be increased, and air conditioning diseases can be eliminated. The ratio of the distance between the air outlet of the fresh air device and the air inlet of the indoor unit to the length of the air outlet along the transverse direction of the shell is set between 2: 1 and 1: 1. In this way, the air flow sent out from the air outlet is more easily sucked into the air inlet again, so that more air sent out from the air outlet enters the air inlet and exchanges heat with a heat exchanger. The outdoor fresh air sent into the room reaches the indoor set temperature quickly after heat exchange by the indoor unit heat exchanger, so that the indoor temperature does not fluctuate greatly, the indoor temperature keeps stable, and a comfortable and healthy environment isprovided for users.

The invention provides a multi-split air conditioner defrosting method and device, a multi-split air conditioner system and a readable storage medium. The method comprises the steps: judging the on-off state of indoor units, wherein the on-off state comprises shutdown; obtaining the capacity volumes of the indoor units and an outdoor unit after the state is judged, calculating the sum of the capacity volumes of the shutdown indoor units, and calculating the ratio of the sum of the capacity volumes to the capacity volume of the outdoor unit; and controlling the indoor units to enter corresponding defrosting modes according to the ratio. According to the multi-split air conditioner defrosting method and device, the multi-split air conditioner system and the readable storage medium, the state of each indoor unit of the multi-split air conditioner system can be analyzed, the actual use condition of the multi-split air conditioner system is represented through the capacity volume ratio related to the state of each indoor unit, and defrosting control is carried out according to the actual operation condition so that the defrosting control can be fit with the actual use condition of the multi-split air conditioner system, the indoor temperature is kept stable as much as possible during defrosting, and the thermal comfort experience of a user is guaranteed.

The invention provides a ventilating cabinet type air conditioner indoor unit. The ventilating cabinet type air conditioner indoor unit comprises a machine shell, at least one air supplying assembly,a heat exchanger and a ventilating device, wherein the machine shell is provided with a machine shell air inlet and at least one machine shell air outlet, the at least one air supply assembly is arranged in the machine shell, the air supply assembly comprises a centrifugal fan and a volute arranged outside the centrifugal fan, and the centrifugal fan is configured to suck indoor air from the machine shell air inlet and bring the indoor air to be sent to the indoor environment again through the machine shell air outlets; the heat exchanger is arranged on an air inlet main air duct between the volute of the centrifugal fan and the machine shell air inlet, so that the entered indoor air through the machine shell air inlet is subjected to heat exchange with the heat exchanger; and the ventilating device is arranged below the air supply assembly, and comprises an air inlet module and a fan module communicating with the air inlet module, wherein the air inlet module is located at the lower part of the fan module, the at least one air supply assembly is further configured to suck at least part of outdoor fresh air discharged from the ventilating fan from the machine shell air inlet, and the outdoor fresh air is discharged from the machine shell air outlets after heat exchanging with the heat exchanger.

The invention relates to a fresh air fan for heat recovery, comprising a cabinet, wherein an independent fresh air suction area, a secondary fresh air filtering area, a fresh air discharge area, a stale air discharge area, a stale air suction air and a heat exchange area are arranged in the cabinet; a first filter used for filtering outdoor air is inlaid in the fresh air suction area; an electrostatic precipitator and a fresh air fan are inlaid in the secondary fresh air filtering area, wherein the electrostatic precipitator is used for filtering fresh air passing through the first filter again, and the fresh air fan is used for discharging the fresh air passing through the electrostatic precipitator to the fresh air discharge area; a second filter used for carrying out third level of filtering on the fresh air discharged from the fresh air fan is inlaid in the fresh air discharge area; an exhaust fan used for discharging indoor stale air to the outside is inlaid in the stale air discharge area; a plate heat exchanger used for carrying out energy exchange between the fresh air and / or the stale air is inlaid in the heat exchange area; and a fresh air bypass area is arranged between the fresh air suction area and the secondary fresh air filtering area, and a bypass valve is arranged in the fresh air bypass area. The fresh air fan is high in filtering efficiency, capable of preventing blockage, large in fresh air inlet space, good in energy saving effect and strong in universality.

The invention discloses a novel external wall insulation material for a building. Materials are heated for pre-foaming after the materials are mixed uniformly, and then the materials are subjected to extrusion molding in a mould. The materials comprises, by weight, 100 parts of polystyrene resin, 0.7-1.2 parts of a foaming agent, 0.4-0.8 part of a nucleating agent, 0.1-0.3 part of lubricant and 10-15 parts of other auxiliary agents. The novel external wall insulation material for the building is good in strength and has functions of heat insulation, weather-proofing, indoor temperature stability maintenance, moisture-proofing, external wall frosting resistance and the like, so that the service life of the building is prolonged.

The invention discloses a novel defrosting system and a control method thereof. The novel defrosting system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger, an air outlet and an air inlet of the compressor are connected through a second air return pipeline, and an electromagnetic valve device is arranged on the second air return pipeline. A novel defrosting method of an air conditioner includes the steps of (1) thin frost and thick frost detection and judgment, and (2) defrosting: when judgment is thin frost, adopting a thin frost removal mode, and when judgment is thick frost, adopting a thick frost removal mode. By the novel defrosting system and the control method thereof, the thin frost and the thick frost can be distinguished automatically, different defrosting modes are adopted for the thin and thick frost to allow indoor temperature to be more stable, defrosting effect is better, and waiting time of customers is shortened.