Computer version of air conditioning principle-air conditioning working schematic diagram

In the process of air conditioning, you may encounter the problem of computer version of air conditioning principle. Today, I will look at the principle of computer air conditioning from the following aspects: what is the principle of air conditioning, the principle of Midea 23 computer air conditioning, and the working schematic diagram of air conditioning.

Working principle diagram of air conditioner

Air conditioning is mainly composed of outdoor unit and indoor unit. For outdoor cooling or heating, the indoor unit is responsible for conveying cold air or hot air indoors, and conveying indoor hot air or cold air outdoors through pipes to achieve the effect of cooling or heating. In the past, air conditioners were simply used for cooling and heating and for handling cold and hot air. With the innovation and progress of technology, many health functions and intelligent settings have been added to air conditioners: 1. Ventilation function. Through the treatment of indoor and outdoor air, the indoor air is guaranteed to be fresh and natural; Second, increasing indoor active oxygen and negative ions through special facilities is beneficial to human health; Third, adopt frequency conversion energy-saving system to minimize power consumption; Fourthly, the remote control of air conditioning is realized through network. After the air conditioner is started, it usually takes 15 minutes to achieve the expected temperature effect. Before going home, people can connect to the landline phone through the network, give instructions, start the air conditioner and set the temperature. When you get home, they can enjoy the "coolness" you need. In addition, the current air conditioner not only pays attention to health, energy saving, low noise and comfort, but also innovates in appearance to make it more novel, fashionable and decorative. The high-temperature and high-pressure refrigeration steam from the compressor enters the condenser through the high-pressure hose; Because the temperature outside the vehicle is lower than that of the refrigerant entering the condenser, most of the heat of the refrigerant flowing in the condenser is taken away by the air outside the vehicle with the help of the condensing fan, so that the high-temperature and high-pressure gas is condensed into high-temperature and high-pressure liquid. When this high-temperature and high-pressure liquid flows through the throttling expansion valve, its volume suddenly increases and its pressure drops, becoming a low-pressure and low-temperature atomized liquid, which enters the evaporator and vaporizes at constant pressure. Because the temperature of the refrigerant when it vaporizes in the tube is lower than the temperature of the circulating air in the car outside the evaporator tube, it can absorb the heat in the air outside the tube, thus reducing the temperature of the air flowing through the evaporator, thus producing a cooling effect. The evaporated refrigeration steam is pumped and compressed by the compressor into high temperature and high pressure gas to complete the refrigeration system. Household central air conditioning-working principle-classification of household central air conditioning ☆ Air duct machine, a fixed-frequency outdoor unit and a fixed-frequency indoor unit, which can send cold and hot air to each room through air ducts, and can easily introduce outdoor fresh air; It is also easy to carry out centralized treatment such as air humidification, and it is a cheap machine. Reasonable design of noise in each room only increases 1 ~ 3 decibels. There is no need for ceiling in the bedroom, and the temperature of each room can be controlled above the temperature set by the main thermostat. It can transfer a certain proportion of energy to achieve the effects of saving energy and accelerating the cooling and heating speed of air conditioning. The local noise of the indoor unit is relatively large, which is measured between 42 and 52 decibels according to different installation conditions on site, and the design and installation requirements are very professional. ☆ Constant frequency multi-connection and multi-traction (1) integrates split air conditioners into an outdoor unit, with three compressors at most, and the refrigeration system is independent; Change the exposed indoor unit into the concealed indoor unit; It is difficult to introduce fresh air, which is a deformation of split air conditioning. The noise of the bedroom fan will increase by 7 ~ 14 dB from low to high, and the maximum noise can reach 50 dB. Each bedroom needs a suspended ceiling with a length of 1.2m, a width of 0.6m and a height of 0.3m, and a manhole is also needed. Each indoor unit needs a pipe to discharge condensed water. The refrigeration system is independent, but the loop part has * * * use points; When there are faults such as external fan, external temperature probe, pressure protection or local short circuit of electrical appliances, the whole machine will not run. (2) There are 1 ~ 2 variable frequency compressors or 1 fixed frequency compressors, and the circuit has radio frequency interference, which has an impact on the computer. Fresh air introduction ceiling and manhole condensate are the same as multi-line system; The branch pipe of fluorine pipe needs reasonable design; The upper and lower floors use 1 machine, and the pipeline requirements are higher; When it is fully open, it is easy to have poor effect in the terminal. ☆ Cold and hot water heaters, constant frequency cold and hot water heaters or variable frequency cold and hot water heaters, large central air conditioners are reduced, and condensers are changed from water cooling to air cooling; Pump hot and cold water into the fan coil unit. Fresh air intake, manhole, ceiling condensate discharge and noise indicator are the same as those of multi-line connection. But hot and cold water pipes are added; Due to the large temperature difference, the sealing problem is outstanding, and the water leakage has great damage to the decoration. In addition, the evaporator of large central air conditioner is cleaned and pickled regularly; There is no good solution for domestic hot and cold water heaters, and the long-term use efficiency of cold and heat exchangers will be greatly reduced. If it can be combined with the central water treatment system, the above difficulties can be overcome. Air conditioning is used in a single room, and hot and cold water pipes flow through fan coils in other rooms, which will also produce energy consumption; It is popular to close the waterway with electromagnetic water valve; In addition to the cost factor; It will also cause the problem that the local water flow speed is too high and noise is generated. 2. The working principle of home central air conditioning 1. The basic working process of the cold (hot) water unit is: the outdoor refrigeration unit cools (or heats) the cold (hot) medium water, and then the cooled cold (hot) water is transported to the indoor fan coil unit by the water pump, and the fan coil unit exchanges heat with the indoor air through local return air, thus achieving the purpose of indoor air treatment. 2. The basic working process of air duct (air duct) unit is: during refrigeration, outdoor refrigeration unit absorbs refrigerant vapor from indoor unit, and delivers liquid refrigerant to indoor units after compression and condensation. When heating, the outdoor refrigeration unit absorbs refrigerant vapor from the condenser, and delivers the vapor refrigerant to each indoor unit after compression. The indoor unit sucks air through the air return opening on the ceiling, sends it into the air duct (air duct) installed on the ceiling of each indoor room after heat exchange, and delivers the air to each indoor room through the diffuser on the air outlet. There are fresh air doors and exhaust doors on the air duct (air duct), which can replace air according to a certain proportion to ensure indoor air quality. 3. The basic working process of the frequency conversion multi-unit is: during refrigeration, the outdoor refrigeration unit absorbs refrigerant vapor from the indoor unit, and delivers the liquid refrigerant to each indoor unit after compression and condensation. When heating, the outdoor refrigeration unit absorbs refrigerant vapor from the condenser, and delivers the vapor refrigerant to each indoor unit after compression. Each indoor unit is installed on the ceiling in a concealed way. Air is sucked in through its air return port, sent in after heat exchange, and then the treated air is sent back to the room through the air supply port in the form of local return air. The energy adjustment mode of the unit is controlled by microcomputer, and the inverter compressor of the outdoor unit automatically adjusts the working state of the compressor according to the change of indoor cold and heat load to meet the requirements of indoor cold and heat load.

Working principle diagram of air conditioner

1. Refrigeration cycle: The flow direction of refrigerant for refrigeration workers is: compressor → muffler → external heat exchanger of four-way reversing valve (condensation at this time → one-way valve 1→ drying filter 2→ capillary tube 2→ indoor heat exchanger (evaporator at this time) → buffer → four-way reversing valve → compressor.

2. Heating work: Under heat pump condition, the flow direction of refrigerant is: compressor sounder → four-way reversing valve → buffer → indoor heat exchanger → one-way valve 2→ drying filter 1→ capillary 1→ outdoor heat exchanger → four-way reversing valve → compressor.

When air conditioning is used for refrigeration, the compressor sucks in low-pressure gaseous refrigerant, compresses it into high-temperature and high-pressure gaseous refrigerant, and sends it to the condenser for refrigeration. The axial flow fan sucks outdoor air from the shutters on the left and right sides of the air conditioner and sends it to the condenser, so that the refrigerant vapor is cooled and turned into high-pressure liquid refrigerant, and then it is sent to the evaporator after being throttled and depressurized by the capillary tube. The indoor air is sucked into the evaporator by the centrifugal fan, and the low-pressure liquid refrigerant entering the evaporator becomes gaseous refrigerant because it absorbs the heat of the indoor air, so that the indoor air is cooled, and the cooled indoor air returns to the room through the air duct under the action of the centrifugal fan. The low-pressure gaseous refrigerant passing through the evaporator is sucked into the compressor and compressed into high-pressure gaseous refrigerant again.

Heating is the reverse cycle of refrigeration.

Working principle diagram of air conditioner

Air conditioning principle

By compressing some easily liquefied gases [media] and liquefying them, and releasing a lot of heat at the same time, the temperature of the surrounding air is raised, and then the compressed liquefied media enters the evaporator for evaporation, and the air is reduced to gas after cooling. In the process of waste, the medium should absorb the surrounding heat, and the temperature of the surrounding air will decrease. Split air conditioner consists of two parts. The outdoor part is the core part of air conditioning-compressor, which consists of compressor and heat exchanger. The indoor part is the air conditioner, which consists of the control part of the whole air conditioner [including automatic control and operation control] and the heat exchanger.

At present, there are three main types of household air conditioners: wall-mounted air conditioners, wall-mounted air conditioners and window air conditioners.

Wall-mounted air conditioners and wall-mounted air conditioners consist of indoor units and outdoor units. The indoor unit is mainly composed of evaporator, air supply system, controller and shell. The outdoor unit is mainly composed of air supply system (blade and motor), condenser, compressor, pipeline system, circuit and casing.

The window machine is mainly composed of evaporator, condenser, compressor, pipeline system, electrical control system and shell.

Midea 23 computer board air conditioning principle

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What is the principle of air conditioning?

The principle of air conditioning and the concept of "variable frequency air conditioning" are compared with the traditional "air conditioning". As we all know, the voltage of China's power grid is 220 volts and 50 hertz, and the air conditioner working under this condition is called "fixed frequency air conditioner". Because the power supply frequency can't be changed, the rotating speed of the compressor of the traditional fixed frequency air conditioner is basically unchanged. By constantly "starting and stopping" the compressor to adjust the indoor temperature, it is easy to cause the room temperature to be hot and cold between starting and stopping, which will consume more electricity. In contrast, the inverter of "variable frequency air conditioner" changes the power supply frequency of the compressor and adjusts the speed of the compressor. According to the compressor speed, the room temperature fluctuates little, consumes less electricity, and greatly improves the comfort. Frequency conversion air conditioner with frequency conversion control technology can automatically select heating, cooling and dehumidification operation modes according to the ambient temperature, so that the room can reach the required temperature quickly in a short time with low rotation speed and low energy consumption, and fluctuate with small temperature difference, thus achieving rapid, energy-saving and comfortable temperature control effect. High power supply frequency, high compressor speed and large refrigeration (heat) capacity of air conditioner; When the power supply frequency is low, the cooling (heating) capacity of the air conditioner is small. This is the so-called "fixed frequency" principle. The core of inverter air conditioner is its inverter, which is a high-tech that came out in the 1980 s. It realizes the automatic adjustment of motor working frequency through current conversion, and changes the fixed grid frequency of 50Hz into frequency conversion of 30 to 130Hz, thus completing a new revolution of air conditioning. At the same time, the power supply voltage range reaches 142V to 270V, which completely solves the problem that the air conditioner cannot work normally due to the unstable power grid voltage. Every time the inverter air conditioner is used, it usually heats or cools the air conditioner with maximum power and air volume, and quickly approaches the set temperature. Because the inverter air conditioner improves the low-temperature heating capacity by increasing the working frequency of the compressor, the maximum heating capacity can reach 1.5 times that of the same brand and the same level air conditioner, and it can still maintain good heating effect at low temperature. In addition, the general split machine has only four speeds that can be adjusted, but when the indoor fan of the inverter air conditioner runs automatically, the speed will change within the range of 12 with the working frequency of the compressor. Because the rotation speed of the fan is reasonably matched with the capacity of the air conditioner, the quiet operation with low noise is realized. When the air conditioner runs at high power and quickly approaches the set temperature, the compressor will run at low speed and low energy consumption, and only use the required power to maintain the set temperature. This not only stabilizes the temperature, but also avoids the life attenuation caused by frequent start and stop of the compressor, greatly reduces the power consumption and realizes high efficiency and energy saving. "Variable frequency air conditioner" adopts advanced technology, which can be started at low pressure and low temperature due to low voltage, which can improve the situation that air conditioners are difficult to start in some areas in winter due to unstable voltage or low indoor temperature. Because of the stepless speed change of the compressor, it can also meet the needs of refrigeration and heating in a larger area. However, the price of "variable frequency air conditioner" is usually about 1000 yuan higher than that of "fixed frequency air conditioner", so the following points should be paid attention to when purchasing "variable frequency air conditioner": 1. DC frequency conversion saves energy 48%. Experts from China Refrigeration Society pointed out that the polarities of the two electrodes of DC are fixed, and the current has only one direction, so there will be no alternation and no frequency at all. What about frequency conversion? At present, the so-called "DC frequency conversion air conditioner" advertised in the market is actually a DC speed regulation air conditioner, and the DC speed regulation technology adopted by it is far superior to the frequency modulation technology. However, in order to make full use of people's thinking mode, marketers put on the original inverter hat without thinking, so they made a joke. According to reports, DC speed regulation only goes through a voltage conversion, so the energy loss is smaller than that of FM speed regulation. In addition, because the rotor of this DC motor is a permanent magnet, it also saves the rotor current consumption of three-phase AC asynchronous motor, so its electrical efficiency from power supply to the motor is higher than that of frequency modulation speed regulation, saving some energy. However, some manufacturers exaggerate the energy saving of this internal regulation system as the energy saving of the whole machine, so there is a saying that energy saving is 48%. Experts said that energy saving mainly depends on the design and configuration of the refrigeration system and the size of the refrigeration coefficient of the system. It is not difficult to see that the improvement of fixed-speed air conditioning to variable-speed air conditioning is mainly to improve its automatic adjustment mode and improve the quality of the machine, rather than saving energy. However, it should be pointed out that speed regulation is only a basis to improve the quality of air conditioning operation, and the real improvement depends on the matching of refrigeration system. The key components to adjust the cooling capacity of the system are throttling and decompression components. If the capillary tube with constant damping is not replaced by an electronic pressure reducing valve (expansion valve) with adjustable damping suitable for speed regulation range, then this speed regulation air conditioner is of little significance and even consumes the electric energy required for internal conversion. At present, the efficiency ratio of air conditioners is generally between 2.6 and 2.9, and rarely exceeds 3.0. So the propaganda of saving energy by 48% is inaccurate. Second, "wage conversion" is not to reduce prices, but to reduce costs. The price of "wage conversion" air conditioners is about 1000 yuan lower than that of most "frequency conversion" air conditioners, mainly to reduce costs. First of all, at present, inverter air conditioners are basically double-rotor, and most of them use imported compressors, while "wage inverter" uses Shanghai Hitachi single-rotor compressor. The difference is about a few hundred dollars. Secondly, there are two kinds of throttling devices, one is an expansion valve and the other is a capillary. Capillary tube for general constant frequency air conditioner and expansion valve for variable frequency air conditioner. The "wage frequency conversion" uses a capillary tube, which costs more than ten yuan, and the expansion valve costs one or two hundred yuan. The third is the frequency converter, which is generally imported, and the "wage frequency converter" is made in China. At this point, in addition to the difference in cost, there is also the difference in frequency conversion range. Fourth, the "wage inverter" is a single-cooling inverter, which is not used in winter. The commonly used four-way valve has become a straight-through, and a four-way valve costs several hundred yuan. Together, these items are estimated to reduce the cost by around 800 yuan. Third, don't take the maximum cooling capacity as the standard of purchase. There is a difference between the choice of inverter air conditioner and ordinary air conditioner. When purchasing, the power of inverter air conditioner should be determined according to the area of the room, rather than the maximum refrigeration capacity as the standard for purchasing. Because the inverter air conditioner does not work under the maximum refrigeration condition for a long time, its maximum refrigeration capacity is limited to the refrigeration capacity that can be achieved in a room with a specific area in a short time, so it must be avoided to use it in the case of over-area. Experts suggest that consumers can buy (145— 175)W square meters inverter air conditioner.