An air conditioning control method for assisting oxygen therapy

Abstract

This invention relates to the field of air conditioning control technology, and proposes an air conditioning control method for auxiliary oxygen intake, comprising: adjusting the speed of the air compressor based on the residual cooling capacity of the refrigeration module; performing preliminary heat exchange between the high-temperature, high-pressure compressed air and the condenser of the refrigeration module via a precooler, followed by deep heat exchange with the cooling capacity provided by the evaporator; performing counter-current heat exchange between the low-temperature, high-pressure air and the low-temperature nitrogen returning from the distillation column via a counter-current heat exchanger to obtain cryogenic air and delivering it to a throttling expansion device; the throttling expansion device throttles and expands the cryogenic air, adjusting the opening of the expansion valve based on the pressure difference and temperature change before and after throttling to continuously maintain the optimal liquefaction rate, obtaining a gas-liquid mixture and delivering it to the distillation column; the distillation column performs distillation separation on the gas-liquid mixture, controlling the purity of the oxygen product by adjusting the reflux ratio, outputting an oxygen product of a specified purity, and obtaining low-temperature nitrogen to be returned to the counter-current heat exchanger for cooling capacity recovery.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control technology, and in particular to an air conditioning control method for auxiliary oxygen inhalation. Background Technology

[0002] Against the backdrop of the increasing demand for indoor environmental quality and auxiliary oxygen supply in the current medical and health fields, air conditioning equipment with both cooling and oxygen generation functions is gradually attracting attention.

[0003] Currently, some devices with oxygen generation capabilities are in use. A typical approach involves adding a separate oxygen generation unit to a traditional refrigeration cycle, such as using molecular sieves or membrane separation technology to extract oxygen from the air. These devices usually treat refrigeration and oxygen generation as two relatively independent subsystems, driven by different power sources and control logics. The refrigeration module is responsible for regulating the indoor temperature, while the oxygen generation module operates based on its own designed capacity. There is a lack of synergy in energy use between the two, and the excess cooling capacity generated by the refrigeration system is not effectively utilized by the oxygen generation module.

[0004] However, this type of existing technology has a significant drawback: low energy efficiency. Because the refrigeration and oxygen production processes operate independently, the excess cooling capacity generated by the refrigeration system cannot be identified and utilized by the oxygen production module in real time, resulting in a large amount of wasted cooling energy. At the same time, the oxygen production module often needs to consume more electrical energy to reach the required air liquefaction temperature, resulting in a low overall system energy efficiency ratio, which is not conducive to energy-saving operation and the stability of continuous oxygen supply. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to propose an air conditioning control method for auxiliary oxygen inhalation, which seeks to solve the problems of uneven cooling distribution and low energy utilization when traditional air conditioners switch between cooling and oxygen production functions by coordinating the operation of the cooling module and the oxygen enrichment module.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An air conditioning control method for auxiliary oxygen inhalation, wherein the control method is applied to the air conditioner, the air conditioner includes a refrigeration module and an oxygen enrichment module, the refrigeration module includes an evaporator, a compressor, a condenser and a throttling device, and the oxygen enrichment module includes an air compressor, a precooler, a countercurrent converter, a throttling expansion device and a distillation column, wherein the air compressor, precooler, countercurrent converter, throttling expansion device and distillation column are connected in sequence;

[0008] The control method includes:

[0009] When the oxygen-enriched mode activation command is received:

[0010] The compressor of the refrigeration module and the air compressor of the oxygen-enriched module are started to generate high-temperature and high-pressure refrigerant and high-temperature and high-pressure compressed air, respectively.

[0011] The speed of the air compressor is adjusted based on the remaining cooling capacity of the refrigeration module to control the flow rate of the high-temperature and high-pressure compressed air, so that the flow rate of the high-temperature and high-pressure compressed air matches the cooling capacity available for air liquefaction.

[0012] The precooler performs a preliminary heat exchange between the high-temperature, high-pressure compressed air and the condenser of the refrigeration module to obtain a first low-temperature, high-pressure air. Then, it performs a deep heat exchange with the cooling capacity provided by the evaporator to obtain a second low-temperature, high-pressure air, which is then delivered to the counter-current heat exchanger.

[0013] The countercurrent heat exchanger exchanges the second low-temperature high-pressure air with the low-temperature nitrogen returning from the distillation column in a countercurrent heat exchange and monitors the temperature of the air after the heat exchange until the temperature of the air after the heat exchange reaches below the critical temperature required for throttling expansion, thus obtaining cryogenic air and delivering it to the throttling expansion device.

[0014] The throttling expansion device throttles and expands the cryogenic air, and adjusts the opening of the expansion valve based on the pressure difference and temperature change before and after throttling to maintain the optimal liquefaction rate, thereby obtaining a gas-liquid mixture and delivering it to the distillation column.

[0015] The distillation column performs distillation separation on the gas-liquid mixture, controls the purity of the oxygen product by adjusting the reflux ratio, outputs oxygen product of specified purity, and obtains low-temperature nitrogen gas to be refluxed to the countercurrent heat exchanger for cold energy recovery.

[0016] Preferably, when the user first sets the cooling temperature and then sets the oxygen production target:

[0017] The remaining cooling capacity of the cooling module is determined based on the set cooling temperature.

[0018] Based on the remaining cooling capacity and the set oxygen production target, the speed of the air compressor is adjusted to control the flow rate of the high-temperature and high-pressure compressed air;

[0019] When the user sets the oxygen production target first and then sets the cooling temperature:

[0020] The required cooling capacity allocation is determined based on the set oxygen production target;

[0021] The operating parameters of the refrigeration module are adjusted based on the required cooling capacity allocation and the set refrigeration temperature.

[0022] The operating parameters include the compressor operating frequency, the opening degree of the throttling device, and the refrigerant distribution flow rate between the condenser and the evaporator.

[0023] Preferably, when the user first sets the cooling temperature and then sets the oxygen production target:

[0024] Monitor the superheat parameter at the evaporator outlet. When the superheat parameter is greater than a first set threshold, it is determined to be a state of insufficient utilization of cooling capacity.

[0025] Calculate the difference between the set cooling temperature and the indoor ambient temperature. When the difference is greater than the second set threshold, it is determined to be a high cooling load state.

[0026] When both insufficient cooling capacity utilization and high cooling load are detected simultaneously, it is determined that the remaining cooling capacity of the cooling module is insufficient.

[0027] The required compressor frequency increase is calculated based on the difference between the customized cooling temperature and the indoor ambient temperature, and the target opening degree of the throttling device is calculated based on the frequency increase.

[0028] Adjust the compressor operating frequency and the opening of the throttling device to maintain the evaporator outlet superheat within the optimal superheat range;

[0029] Based on the adjusted cooling output of the refrigeration module, the maximum supported oxygen production capacity of the oxygen enrichment module is recalculated, and the speed of the air compressor is adjusted accordingly.

[0030] Preferably, when the user first sets the oxygen production target and then sets the cooling temperature, and the remaining cooling capacity in the current cooling mode cannot meet the oxygen production target:

[0031] Calculate the theoretical cooling capacity required for the oxygen production target and assess the current maximum available cooling capacity of the cooling module. When the theoretical cooling capacity consumption is less than or equal to the maximum available cooling capacity, execute control according to the user-set oxygen production target and cooling temperature.

[0032] When the theoretical cooling capacity consumption exceeds the maximum available cooling capacity:

[0033] If the difference between the current indoor ambient temperature and the set cooling temperature is less than the third set threshold, the cooling capacity requirement of the oxygen-enriched module will be prioritized. The compressor operating frequency will be increased according to the size of the cooling capacity gap, and the opening of the throttling device will be adjusted according to the increase in frequency to increase the total cooling capacity output of the cooling module.

[0034] If the difference between the current indoor ambient temperature and the set cooling temperature is greater than or equal to the third set threshold, the cooling-oxygen production coordinated control mode is activated. The compressor operating frequency increase is calculated based on the size of the cooling capacity gap, and the opening of the throttling device is adjusted accordingly based on the frequency increase. At the same time, the cooling capacity supply of the oxygen enrichment module and the cooling module is proportionally allocated based on the actual available cooling capacity.

[0035] Preferably, the cooling supply to the oxygen-enriched module and the refrigeration module is allocated proportionally based on the actual available cooling capacity, including:

[0036] Calculate the cooling capacity gap between the current maximum available cooling capacity of the cooling module and the actual cooling capacity requirement, and obtain the user-set cooling temperature priority flag and oxygen production target priority flag;

[0037] If the cooling temperature priority flag is high, then the cooling capacity is allocated according to the cooling capacity demand of the cooling module, and the remaining cooling capacity is allocated to the oxygen enrichment module, and the oxygen production target is reduced accordingly.

[0038] If the oxygen production target priority flag is high, then the cooling capacity is allocated first according to the cooling capacity demand of the oxygen enrichment module, and the remaining cooling capacity is allocated to the refrigeration module. The compressor operating frequency and throttling device opening of the refrigeration module are adjusted accordingly.

[0039] If both have the same priority, the load of refrigeration and oxygen production will be reduced according to the ratio of cooling capacity deficit, and the operating parameters of the refrigeration module and the air compressor speed of the oxygen enrichment module will be recalculated.

[0040] Preferably, the distribution of cooling capacity satisfies the following relationship:

[0041] When the cooling temperature priority flag is set to high, the final available cooling capacity of the oxygen-enriched module is... Satisfying the relation:

[0042] ;

[0043] When the oxygen production target priority is set to high, the final available cooling capacity of the cooling module is... Satisfying the relation:

[0044] ;

[0045] When both priority flags are the same, the cooling mode and the oxygen-enriched module share the same upper limit of available cooling capacity. Satisfying the relation:

[0046] ;

[0047] Actual cooling capacity distributed by the refrigeration module The actual cooling capacity allocated to the oxygen generation module ;

[0048] in, This indicates the maximum cooling capacity that the cooling module can provide under the current operating conditions. This indicates the cooling capacity requirement of the refrigeration module. This indicates the cooling capacity requirement of the oxygen generation module. This represents the cooling capacity loss coefficient during the operation of the cooling module itself. This represents the cooling loss coefficient of the oxygen generation module during the liquefaction and distillation processes. This indicates the efficiency of cold energy transfer from the refrigeration module to the oxygen generation module. This represents the weighting factor of the cooling module. This represents the weighting factor of the oxygen generation module.

[0049] Preferably, during the distillation separation of the gas-liquid mixture by the distillation column:

[0050] The temperature and pressure at the top and bottom of the distillation column are monitored in real time, and the current actual reflux ratio is calculated based on the detected values ​​of nitrogen purity at the top and oxygen purity at the bottom.

[0051] The actual reflux ratio is compared with the target reflux ratio. If the actual reflux ratio is lower than the target reflux ratio, the opening of the reflux regulating valve is increased based on the difference between the actual reflux ratio and the target reflux ratio to proportionally adjust the rate of change of the reflux liquid volume and increase the reflux liquid volume.

[0052] If the actual reflux ratio is higher than the target reflux ratio, the reflux regulating valve is reduced based on the difference between the actual and target reflux ratios to proportionally adjust the rate of change of the reflux liquid volume and reduce the reflux liquid volume.

[0053] Preferably, it includes: arranging temperature sensor arrays in the airflow channel inlet section, middle section and outlet section of the counterflow heat exchanger to collect temperature distribution data of different cross sections in real time;

[0054] The initial heat exchange efficiency is calculated based on the temperature distribution at the inlet section, and the inlet flow rate and distribution uniformity of the low-temperature nitrogen are adjusted according to the heat exchange efficiency value.

[0055] A dynamic heat exchange model is established based on the temperature distribution in the middle section to predict the remaining heat exchange time required to reach the target temperature. The final heat exchange effect is evaluated based on the temperature distribution in the outlet section, and the temperature field uniformity coefficient and average temperature difference are calculated.

[0056] When the temperature at any measuring point in the outlet section is found to be higher than the critical temperature, the residence time is increased by adjusting the angle of the guide vanes and the cross-sectional area of ​​the flow path inside the heat exchanger. When the difference between the overall temperature of the outlet section and the critical temperature is found to be greater than the preset difference value, the heat exchange intensity is optimized by reducing the nitrogen reflux flow rate and reducing the flow resistance.

[0057] Preferably, the dynamic model of heat exchange satisfies the following relationship:

[0058] ;

[0059] The temperature field uniformity coefficient satisfies the following relationship:

[0060] , ;

[0061] The average temperature difference satisfies the following relationship:

[0062] ;

[0063] in, Indicates the remaining heat exchange time. Indicates the target critical temperature. This indicates the average temperature of the middle section. Indicates air density, Indicates air volume flow rate, This indicates the specific heat capacity of air at constant pressure. Indicates the overall heat transfer coefficient. Indicates the heat exchange area. This represents the logarithmic mean temperature difference. Indicates the temperature field uniformity coefficient. Indicates the standard deviation of temperature. This indicates the average temperature at the outlet section. Indicates the number of measurement points. This represents the temperature at the i-th measuring point. Indicates the air inlet temperature. Indicates the air outlet temperature. Indicates the nitrogen inlet temperature. This indicates the nitrogen outlet temperature.

[0064] One of the above technical solutions has the following advantages or beneficial effects:

[0065] This invention ensures basic resource coordination within the air conditioning system by simultaneously activating the core power unit of the refrigeration and oxygen enrichment modules. Furthermore, by dynamically adjusting the air compressor speed based on remaining cooling capacity, it achieves accurate matching between compressed air flow and available cooling capacity, reducing energy waste and redundant operation of the air conditioning system at the source. Subsequently, through preliminary heat exchange between the precooler and condenser, and deep heat exchange with the evaporator, energy is fully utilized, significantly improving the overall energy efficiency of the air conditioning system. The counter-current heat exchanger prepares and monitors the temperature of cryogenic air, the throttling expansion device maintains the optimal liquefaction rate, and the distillation column precisely controls oxygen purity through reflux ratio adjustment, separating oxygen from the air and recovering cooling capacity. Therefore, this invention achieves a comprehensive technical effect by highly integrating refrigeration and air separation functions, significantly improving energy utilization efficiency, ensuring oxygen product purity, and enhancing the operational stability and adaptability of the air conditioning system. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0067] Figure 1 This is a first flowchart of the air conditioning control method for assisted oxygen inhalation provided in an embodiment of the present invention;

[0068] Figure 2 This is a second flowchart of the air conditioning control method for assisted oxygen inhalation provided in an embodiment of the present invention;

[0069] Figure 3 This is a flowchart of step S3 of the air conditioning control method for auxiliary oxygen inhalation provided in an embodiment of the present invention. Detailed Implementation

[0070] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0071] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] An air conditioning control method for assisting oxygen inhalation is disclosed. The control method is applied to the air conditioner, which includes a refrigeration module and an oxygen-enriching module. The refrigeration module comprises an evaporator, a compressor, a condenser, and a throttling device. Figure 1 and 2 As shown, in a preferred embodiment of the present invention, the oxygen-enriched module includes an air compressor, a precooler, a countercurrent converter, a throttling expansion device, and a distillation column, which are connected in sequence.

[0073] The control method includes the following steps:

[0074] When the oxygen-enriched mode activation command is received:

[0075] S1: Start the compressor of the refrigeration module and the air compressor of the oxygen-enriched module to generate high-temperature and high-pressure refrigerant and obtain high-temperature and high-pressure compressed air, respectively;

[0076] The compressor in the refrigeration module is the heart of the refrigeration system, achieving the refrigeration cycle by compressing the refrigerant. The air compressor in the oxygen-enriched module is responsible for compressing the air to a certain pressure, providing conditions for subsequent air separation. "High-temperature, high-pressure refrigerant" refers to the state of the refrigerant after it has done work in the compressor; its temperature and pressure have increased, enabling it to release heat in the condenser. "High-temperature, high-pressure compressed air" refers to the air after it has been compressed by the air compressor, resulting in similarly increased temperature and pressure, laying the foundation for subsequent pre-cooling and distillation operations.

[0077] In actual operation, when the user issues the oxygen-enriched mode start command through the control panel, the air conditioner's control system simultaneously sends start signals to both the compressor in the refrigeration module and the air compressor in the oxygen-enriched module. The compressor starts running, drawing in low-temperature, low-pressure refrigerant vapor from the evaporator, compressing it, and then discharging high-temperature, high-pressure refrigerant gas. At the same time, the air compressor also starts working, drawing in outside air, compressing it, and producing high-temperature, high-pressure compressed air.

[0078] S2: Adjust the speed of the air compressor based on the remaining cooling capacity of the refrigeration module to control the flow rate of the high-temperature and high-pressure compressed air, so that the flow rate of the high-temperature and high-pressure compressed air matches the cooling capacity available for air liquefaction;

[0079] It should be noted that "remaining cooling capacity" refers to the excess cooling capacity of the refrigeration module after meeting the indoor cooling needs; it reflects the module's surplus workload. "Air compressor speed" is a key factor determining the compressed air flow rate; the higher the speed, the more air is compressed per unit time. By monitoring the refrigeration module's operating status in real time through sensors, the remaining cooling capacity is calculated, and the air compressor speed is adjusted accordingly to match the compressed air flow rate with the available cooling capacity. This ensures a sufficient cooling source for the oxygen production process while preventing cooling waste.

[0080] Understandably, the purpose of step S2 is to achieve a dynamic balance of cooling capacity between the refrigeration and oxygen generation modules. The principle is that if the cooling capacity generated by the refrigeration module is not effectively utilized, it will result in energy waste; conversely, if the oxygen generation module does not receive sufficient cooling capacity, it will affect the efficiency of air liquefaction and oxygen separation. By adjusting the speed of the air compressor, the flow rate of compressed air can be precisely controlled to match the remaining cooling capacity of the refrigeration module, thereby improving the energy utilization rate of the entire system.

[0081] Specifically, as the indoor temperature gradually approaches the set temperature and the remaining cooling capacity of the cooling module increases, the air compressor speed is increased, and the compressed air flow rate is increased, allowing more air to enter the subsequent cooling and separation processes. Conversely, when the indoor temperature is low and the remaining cooling capacity decreases, the air compressor speed is reduced, and the compressed air flow rate is decreased to match the limited cooling capacity. This adjustment method can flexibly adjust the operating status of the two modules according to the actual indoor cooling and oxygen production needs, achieving a rational allocation of energy.

[0082] S3: The precooler performs a preliminary heat exchange between the high-temperature and high-pressure compressed air and the condenser of the refrigeration module to obtain the first low-temperature and high-pressure air. Then, it performs a deep heat exchange with the cooling capacity provided by the evaporator to obtain the second low-temperature and high-pressure air, which is then delivered to the counter-current heat exchanger.

[0083] It should be noted that the "precooler" is a heat exchange device within the oxygen-enriched module. Its function is to utilize the heat dissipated by the condenser of the refrigeration module to initially cool the high-temperature, high-pressure compressed air. "Initial heat exchange" refers to the first heat exchange between the compressed air and the heat dissipated by the condenser in the precooler, lowering the air temperature, but not yet achieving deep cooling. "First low-temperature, high-pressure air" is the air after initial cooling by the precooler; its temperature has decreased, but further cooling is still required. "Cooling capacity provided by the evaporator" refers to the cooling capacity generated by the evaporator in the refrigeration module during the refrigeration cycle; this cooling capacity can be used for deep cooling of the air. "Deep heat exchange" refers to the second heat exchange between the compressed air and the cooling capacity provided by the evaporator in another heat exchange device, further lowering the air temperature to obtain "second low-temperature, high-pressure air," creating conditions for subsequent air liquefaction and other operations.

[0084] Step S3 involves two heat exchange processes, such as... Figure 3 As shown, the temperature of the compressed air is gradually reduced to fully utilize the cooling capacity generated by the refrigeration module, achieving tiered energy utilization. First, the heat dissipated by the condenser is used for preliminary cooling of the compressed air, recovering some of the cooling capacity and lowering the air temperature, thus reducing the load on subsequent deep cooling. Then, the even lower temperature provided by the evaporator is used for deep cooling of the air, lowering the air temperature to a level close to the air liquefaction temperature, creating favorable conditions for subsequent air separation and oxygen extraction. This design improves the overall energy efficiency of the system, reduces the energy consumption of the refrigeration module, and ensures that the oxygen enrichment module receives sufficiently low-temperature air, ensuring the smooth operation of the oxygen production process.

[0085] Assuming that during a certain oxygen-enriched mode operation, the air compressor produces high-temperature, high-pressure compressed air with the following parameters: temperature 80℃, pressure 0.5MPa, and flow rate 15m³ / min. The heat dissipated by the condenser of the refrigeration module raises the ambient air temperature to 35℃. In the precooler, this high-temperature, high-pressure compressed air undergoes initial heat exchange with the 35℃ air. After 1.5 minutes of heat exchange, the temperature of the compressed air drops to 45℃, resulting in the first low-temperature, high-pressure air.

[0086] Subsequently, the first low-temperature high-pressure air is delivered to the deep cooler. At this time, the cooling capacity provided by the evaporator makes the temperature of the cold air in the deep cooler 5°C. The first low-temperature high-pressure air and the 5°C cold air exchange heat in the deep cooler. After 4 minutes of heat exchange, the temperature of the compressed air is further reduced to 10°C, resulting in the second low-temperature high-pressure air.

[0087] The control system monitored that the inlet and outlet air temperatures of the precooler were 80℃ and 45℃, respectively, and the pressure was 0.5 MPa. The inlet and outlet air temperatures of the deep cooler were 45℃ and 10℃, respectively, and the pressure was 0.5 MPa. The monitoring data showed that the preliminary heat exchange and deep heat exchange processes were proceeding normally. The second low-temperature high-pressure air was then successfully transported to the countercurrent heat exchanger, which prepared for the subsequent air liquefaction and oxygen extraction.

[0088] S4: The countercurrent heat exchanger exchanges the second low-temperature high-pressure air with the low-temperature nitrogen returning from the distillation column in a countercurrent heat exchange and monitors the temperature of the air after the heat exchange until the temperature of the air after the heat exchange reaches below the critical temperature required for throttling expansion, thereby obtaining cryogenic air and delivering it to the throttling expansion device.

[0089] A counter-current heat exchanger is a highly efficient heat exchange device whose internal structure allows two fluids (in this case, cryogenic high-pressure air and cryogenic nitrogen) to exchange heat in a counter-current manner, meaning their flow directions are opposite. This design improves heat exchange efficiency, maintaining a large temperature difference between the two fluids throughout the heat exchange process, thus achieving more efficient heat transfer. "Counter-current heat exchange" refers to the process in which cryogenic high-pressure air and cryogenic nitrogen exchange heat in a counter-current manner within the counter-current heat exchanger. In this way, the air can further release heat, lowering its temperature; while the cryogenic nitrogen absorbs heat, raising its temperature. "Monitoring the temperature of the air after heat exchange" ensures that the air temperature reaches below the critical temperature required for throttling expansion, and temperature sensors or other monitoring equipment are typically installed for real-time measurement. "Cryogenic air" refers to air that, after being cooled by the counter-current heat exchanger, reaches a very low temperature (e.g., below -100°C), meeting the temperature requirements of the throttling expansion device.

[0090] The aim is to utilize the cooling energy of the cryogenic nitrogen returning from the distillation column to further reduce the temperature of the second cryogenic high-pressure air, bringing it to the cryogenic state required for throttling expansion. The highly efficient heat exchange characteristics of the counter-current heat exchanger can fully utilize the cooling energy of the cryogenic nitrogen to achieve deep cooling of the air. Simultaneously, by monitoring the air temperature after heat exchange, it can be ensured that the air temperature meets the requirements for throttling expansion, guaranteeing the efficiency of subsequent air liquefaction and oxygen extraction. Furthermore, this heat recovery and utilization method also helps improve the overall energy efficiency of the system and reduces the waste of cooling energy.

[0091] Suppose that at a certain moment, the temperature of the second cryogenic high-pressure air is 10°C. After entering the countercurrent heat exchanger, it undergoes countercurrent heat exchange with cryogenic nitrogen gas returning from the distillation column at a temperature of -180°C. After a period of heat exchange, the air temperature gradually decreases, while the nitrogen temperature gradually increases. A temperature sensor installed at the air outlet of the countercurrent heat exchanger monitors the air temperature in real time and transmits the data to the control system. When the air temperature drops to -150°C, the control system determines that this temperature is below the critical temperature required for throttling expansion (assumed to be -140°C). At this point, the air is considered to have reached a cryogenic state and can be transported to the throttling expansion device for the next step of throttling expansion operation.

[0092] S5: The throttling expansion device throttles and expands the cryogenic air, and adjusts the opening of the expansion valve based on the pressure difference and temperature change before and after throttling to continuously maintain the optimal liquefaction rate, thereby obtaining a gas-liquid mixture and delivering it to the distillation column;

[0093] A "throttling expansion device" is a device that uses the throttling effect to expand and cool a gas, typically composed of components such as an expansion valve. When gas passes through the throttling device, the temperature drops sharply due to the sudden decrease in pressure, and some of the gas may liquefy, forming a gas-liquid mixture. "Throttling expansion" refers to the process where cryogenic air undergoes a throttling process in the throttling expansion device, resulting in a decrease in pressure and temperature, and partial liquefaction. The "pressure difference before and after throttling" refers to the pressure difference between the cryogenic air before and after entering the throttling expansion device; this pressure difference is one of the key factors in achieving throttling expansion. The "temperature change" is the decrease in air temperature caused by the throttling effect. The "expansion valve opening" is an important parameter for regulating the throttling expansion process; by changing the opening of the expansion valve, the airflow and pressure drop through the valve can be controlled, thus affecting the throttling expansion effect. The "optimal liquefaction rate" refers to the ratio under certain operating conditions that allows air to be liquefied to the maximum extent; this is an important indicator in distillation separation processes because it directly affects oxygen extraction efficiency and yield. A "gas-liquid mixture" refers to a mixture of gas and liquid formed by the partial liquefaction of air after throttling and expansion. The liquid portion is rich in oxygen and other components, providing raw materials for subsequent distillation and separation.

[0094] The air is further cooled and liquefied by a throttling expansion device, providing a suitable gas-liquid mixture for distillation separation. When cryogenic air enters the throttling expansion device, the air temperature drops sharply due to the sudden decrease in pressure, and part of the air liquefies. By adjusting the opening of the expansion valve, the pressure difference and temperature change before and after throttling can be controlled, thereby maintaining the optimal liquefaction rate. The resulting gas-liquid mixture contains a high concentration of oxygen in the liquid portion, which is beneficial for the subsequent distillation separation process, improving the oxygen extraction efficiency and purity. At the same time, reasonable throttling expansion operation can further optimize the energy utilization efficiency of the entire system.

[0095] Assume the pressure of the cryogenic air entering the throttling expansion device is 0.5 MPa and the temperature is -150°C. By adjusting the opening of the expansion valve, the pressure after throttling is reduced to 0.1 MPa. Due to the throttling effect, the air temperature will further decrease to approximately -180°C, and about 30%-40% of the air will liquefy, forming a gas-liquid mixture. This proportion is the liquefaction rate. If the control system detects that the current liquefaction rate is lower than the optimal value (assuming the optimal liquefaction rate is 35%), it will appropriately adjust the opening of the expansion valve, for example, by increasing the opening to increase the pressure difference before and after throttling, allowing more air to liquefy until the liquefaction rate reaches the optimal value. At this point, the resulting gas-liquid mixture is transported to the distillation column, where the liquid portion is rich in oxygen, providing a good feedstock for subsequent distillation separation.

[0096] S6: The distillation column performs distillation separation on the gas-liquid mixture, controls the purity of the oxygen product by adjusting the reflux ratio, outputs oxygen product of specified purity, and obtains low-temperature nitrogen gas to be refluxed to the countercurrent heat exchanger for cold energy recovery.

[0097] A distillation column is a device used to separate different components in a liquid mixture. It typically contains packing material or trays to provide a suitable environment for sufficient contact and mass transfer between the gas and liquid phases. A gas-liquid mixture refers to a mixture containing oxygen, nitrogen, and other components exiting a throttling expansion device. Distillation separation utilizes the differences in volatility of the components in the mixture, involving multiple partial vaporization and condensation processes within the distillation column to separate and purify the different components. The reflux ratio is the ratio of reflux liquid to produced liquid during distillation; it is a crucial parameter affecting distillation efficiency and product purity. The purity of the oxygen product refers to the proportion of oxygen in the output oxygen, usually expressed as a percentage, such as 99.9%. Adjusting the reflux ratio allows control over the purity of the oxygen product to meet different application requirements. Low-temperature nitrogen refers to nitrogen used as a carrier gas or refrigerant during distillation at a relatively low temperature. After being cooled during the distillation process, this portion of nitrogen gas may drop to around -180°C. It can then be used as a cold source to be refluxed to the countercurrent heat exchanger to recover cold energy and further improve the system's energy efficiency.

[0098] Through a distillation process, oxygen in a gas-liquid mixture is separated from other components (mainly nitrogen) to obtain a high-purity oxygen product. Simultaneously, the low-temperature nitrogen generated during distillation is used as a cold source, refluxed to a counter-current heat exchanger for energy recovery, achieving energy recycling. The principle of distillation is based on the difference in volatility of the components in the mixture. Multiple partial vaporization and partial condensation operations are performed within the distillation column, gradually enriching oxygen in the liquid phase, thus obtaining a high-purity oxygen product. Adjusting the reflux ratio can change the gas-liquid ratio within the distillation column, affecting mass transfer and separation efficiency, thereby controlling the purity of the oxygen product. By rationally adjusting the reflux ratio, the energy consumption and efficiency of the distillation process can be optimized while ensuring oxygen purity. Furthermore, refluxing the low-temperature nitrogen to the counter-current heat exchanger fully utilizes its cooling capacity, reducing the cooling load on the refrigeration module and improving the energy efficiency and economy of the entire air conditioning system.

[0099] Preferably, when the user first sets the cooling temperature and then sets the oxygen production target:

[0100] The remaining cooling capacity of the cooling module is determined based on the set cooling temperature.

[0101] Based on the remaining cooling capacity and the set oxygen production target, the speed of the air compressor is adjusted to control the flow rate of the high-temperature and high-pressure compressed air;

[0102] When the user sets the oxygen production target first and then sets the cooling temperature:

[0103] The required cooling capacity allocation is determined based on the set oxygen production target;

[0104] The operating parameters of the refrigeration module are adjusted based on the required cooling capacity allocation and the set refrigeration temperature.

[0105] The operating parameters include the compressor operating frequency, the opening degree of the throttling device, and the refrigerant distribution flow rate between the condenser and the evaporator.

[0106] It should be noted that "cooling temperature" is the desired indoor temperature value, which determines the basic operating load of the refrigeration module; "remaining cooling capacity" refers to the remaining cooling capacity available for oxygen production after the refrigeration module has met its cooling needs. By monitoring the operating parameters of the refrigeration module, such as the evaporator temperature and compressor power, the remaining cooling capacity can be calculated, thus providing a basis for the operation of the oxygen-enriched module. "Oxygen production target" refers to indicators such as the oxygen flow rate or oxygen concentration desired by the user, which determines the cooling capacity requirement of the oxygen-enriched module; "operating parameters" include compressor operating frequency, throttling device opening, and refrigerant flow rate, and the adjustment of these parameters directly affects the cooling capacity output and distribution of the refrigeration module.

[0107] Understandably, the aim is to flexibly adjust the cooling capacity allocation between the cooling and oxygen-enriching modules based on the user's priority order to meet individual user needs. When the user sets the cooling temperature first, the system prioritizes cooling demand, rationally allocating remaining cooling capacity to the oxygen-enriching module to ensure stable indoor temperature regulation while also maintaining oxygen production functionality. Conversely, when the user sets the oxygen production target first, the system prioritizes oxygen production demand, adjusting the operating parameters of the cooling module to ensure sufficient cooling capacity for the oxygen-enriching module, achieving efficient oxygen production. This flexible control strategy improves the system's adaptability and user satisfaction.

[0108] Specifically, when the user sets the cooling temperature, the system determines the operating power of the cooling module based on the difference between the cooling temperature and the current indoor temperature, and then calculates the remaining cooling capacity Qremaining = Qcooling module - Qcooling demand. Then, based on the set oxygen production target, such as the oxygen flow rate Qoxygen target, the required compressed air flow rate Qair = Qoxygen target / k4 (where k4 is the ratio coefficient between oxygen production and compressed air flow rate) is calculated. Combining this with Qremaining = Qair × k3, the air compressor speed n = Qair / (k2) can be derived, achieving precise adjustment of the air compressor speed. When the user sets the oxygen production target, the system determines the required cooling capacity Qoxygen demand = Qoxygen target × k5 (where k5 is the ratio coefficient between the required cooling capacity and oxygen production). Based on Qoxygen demand and the set cooling temperature, the total cooling capacity required by the cooling module Qtotal = Qcooling demand + Qoxygen demand is calculated. Then, by adjusting the compressor operating frequency f, the throttling device opening a, and the refrigerant flow rate q, the cooling capacity of the refrigeration module Qrefrigeration module = k6×f + k7×a + k8×q (k6, k7, and k8 are the proportional coefficients of each parameter to the cooling capacity), which satisfies Qrefrigeration module ≥ Q total refrigeration, thereby ensuring the coordinated operation of refrigeration and oxygen production.

[0109] Preferably, when the user first sets the cooling temperature and then sets the oxygen production target:

[0110] Monitor the superheat parameter at the evaporator outlet. When the superheat parameter is greater than a first set threshold, it is determined to be a state of insufficient utilization of cooling capacity.

[0111] Calculate the difference between the set cooling temperature and the indoor ambient temperature. When the difference is greater than the second set threshold, it is determined to be a high cooling load state.

[0112] When both insufficient cooling capacity utilization and high cooling load are detected simultaneously, it is determined that the remaining cooling capacity of the cooling module is insufficient.

[0113] The required compressor frequency increase is calculated based on the difference between the customized cooling temperature and the indoor ambient temperature, and the target opening degree of the throttling device is calculated based on the frequency increase.

[0114] Adjust the compressor operating frequency and the opening of the throttling device to maintain the evaporator outlet superheat within the optimal superheat range;

[0115] Based on the adjusted cooling output of the refrigeration module, the maximum supported oxygen production capacity of the oxygen enrichment module is recalculated, and the speed of the air compressor is adjusted accordingly.

[0116] It should be noted that the "evaporator outlet superheat parameter" is an important indicator for measuring the operating status of the refrigeration system. It reflects the evaporation of refrigerant in the evaporator. A higher superheat indicates that the refrigerant is evaporating excessively in the evaporator, which may indicate that the cooling capacity is not being fully utilized. The "difference between the set cooling temperature and the indoor ambient temperature" reflects the indoor cooling demand. The larger the difference, the more cooling capacity is needed to reach the set temperature, i.e., it is in a high cooling load state. When both "insufficient cooling capacity utilization" and "high cooling load state" exist simultaneously, it indicates that the cooling capacity generated by the refrigeration module is insufficient to meet the cooling demand, and the remaining cooling capacity is insufficient to support the normal operation of the oxygen-enriched module. The "compressor frequency increase" and "target opening degree of the throttling device" are key parameters for adjusting the cooling capacity output of the refrigeration module. By increasing the compressor frequency and adjusting the opening degree of the throttling device, the cooling capacity of the refrigeration module can be increased. The "optimal superheat range" is an ideal range to ensure the efficient operation of the refrigeration system. By adjusting the operating parameters to keep the evaporator outlet superheat within this range, the cooling effect can be optimized. "Maximum supported oxygen production capacity" refers to the maximum oxygen output that the oxygen-enriched module can achieve under the current cooling output of the refrigeration module. By recalculating and adjusting the air compressor speed based on changes in cooling output, the oxygen-enriched module can be ensured to operate efficiently within the range allowed by the refrigeration module.

[0117] Understandably, this system aims to address the potential issue of insufficient remaining cooling capacity in the refrigeration module when users set the cooling temperature first and then the oxygen production target. By monitoring the evaporator outlet superheat and the indoor-outdoor temperature difference, it accurately assesses cooling capacity utilization and cooling load, promptly identifying situations where insufficient cooling capacity is detected. Once insufficient remaining cooling capacity is determined, the system immediately adjusts the refrigeration module by calculating the compressor frequency increase and the target opening of the throttling device, increasing the cooling capacity output. Simultaneously, the operating parameters of the oxygen enrichment module are adjusted to adapt to changes in the cooling capacity of the refrigeration module, ensuring stable operation and energy efficiency optimization of the entire air conditioning system.

[0118] Specifically, when the user sets the cooling temperature to 25℃, the current indoor temperature is 32℃, and the first set threshold is 5℃ and the second set threshold is 8℃, the system first monitors the evaporator outlet superheat parameter. If the superheat is 8℃, which is greater than the first set threshold of 5℃, it is determined that the cooling capacity is not being fully utilized. Then, the difference between the set cooling temperature and the indoor ambient temperature is calculated to be 7℃, which is greater than the second set threshold of 8℃, indicating a high cooling load. Since both the insufficient cooling capacity utilization and high cooling load conditions are met simultaneously, the remaining cooling capacity of the refrigeration module is determined to be insufficient. Next, based on the 7℃ temperature difference, the required compressor frequency increase Δf is calculated using the formula Δf=k9×ΔT (where k9 is the frequency increase coefficient and ΔT is the temperature difference). Assuming k9=0.2Hz / ℃, then Δf=0.2×7=1.4Hz. Based on Δf, the target opening degree of the throttling device is calculated as atarget = aoriginal + k10 × Δf (k10 is the opening adjustment coefficient). Assuming aoriginal = 50% and k10 = 2% / Hz, then atarget = 50% + 2% × 1.4 = 52.8%. Then, the compressor operating frequency is increased by 1.4Hz, and the throttling device opening degree is adjusted to 52.8%, gradually reducing the evaporator outlet superheat to the optimal superheat range of 3℃-5℃. Finally, based on the adjusted cooling output Qcooling module new of the refrigeration module, the maximum supported oxygen production capacity of the oxygen-enriched module is recalculated as Qoxygen max = Qcooling module new × k3 / k4 (k3 is the conversion coefficient between cooling capacity and flow rate, and k4 is the proportional coefficient between oxygen production and compressed air flow rate). The air compressor speed n = Qoxygen max / (k2) is adjusted accordingly to ensure efficient operation of the oxygen-enriched module under the new cooling conditions. For example, if the cooling output of the refrigeration module after adjustment is 1200 kcal / h, k3 = 0.8 kcal / h·L / min, and k4 = 0.6 L / min·kcal / h, then Q_oxygen_max = 1200 × 0.8 / 0.6 = 1600 L / min. Based on Q_oxygen_max and k2 = 2 L / min·r / min (assuming k2 is the proportional coefficient between flow rate and speed), the air compressor speed n = 1600 / 2 = 800 r / min is calculated. Adjusting the air compressor to this speed achieves stable operation of the oxygen-enriched module.

[0119] Preferably, when the user first sets the oxygen production target and then sets the cooling temperature, and the remaining cooling capacity in the current cooling mode cannot meet the oxygen production target:

[0120] Calculate the theoretical cooling capacity required for the oxygen production target and assess the current maximum available cooling capacity of the cooling module. When the theoretical cooling capacity consumption is less than or equal to the maximum available cooling capacity, execute control according to the user-set oxygen production target and cooling temperature.

[0121] When the theoretical cooling capacity consumption exceeds the maximum available cooling capacity:

[0122] If the difference between the current indoor ambient temperature and the set cooling temperature is less than the third set threshold, the cooling capacity requirement of the oxygen-enriched module will be prioritized. The compressor operating frequency will be increased according to the size of the cooling capacity gap, and the opening of the throttling device will be adjusted according to the increase in frequency to increase the total cooling capacity output of the cooling module.

[0123] If the difference between the current indoor ambient temperature and the set cooling temperature is greater than or equal to the third set threshold, the cooling-oxygen production coordinated control mode is activated. The compressor operating frequency increase is calculated based on the size of the cooling capacity gap, and the opening of the throttling device is adjusted accordingly based on the frequency increase. At the same time, the cooling capacity supply of the oxygen enrichment module and the cooling module is proportionally allocated based on the actual available cooling capacity.

[0124] It should be noted that "theoretical cooling capacity consumption" is a cooling capacity value calculated based on the user-set oxygen production target, using the relationship between the cooling capacity required for oxygen production and the oxygen output; "maximum available cooling capacity" is the maximum cooling capacity that the refrigeration module can provide under current operating conditions. When the theoretical cooling capacity consumption is less than or equal to the maximum available cooling capacity, it means that the refrigeration module can meet the cooling capacity requirements of the oxygen production module, and at this time, the refrigeration and oxygen production control will be executed normally according to the user's settings. "Cooling capacity deficit" is the difference between the theoretical cooling capacity consumption and the maximum available cooling capacity, reflecting the degree of current cooling capacity insufficiency of the refrigeration module. When a cooling capacity deficit exists, different control strategies are adopted according to the size of the indoor and outdoor temperature difference: if the temperature difference is small, it means that the indoor cooling demand is relatively low, and the cooling capacity requirement of the oxygen enrichment module can be prioritized, increasing the cooling capacity output by increasing the compressor frequency and adjusting the opening of the throttling device; if the temperature difference is large, it means that the indoor cooling demand is high, and at this time, the coordinated control mode is activated, comprehensively considering the needs of refrigeration and oxygen production, and allocating the cooling capacity proportionally.

[0125] Specifically, assume the user first sets the oxygen flow rate to 10L / min, then sets the cooling temperature to 24℃. Based on the relationship between the required cooling capacity for oxygen production and the oxygen output, Qoxygen-demand = 1.5 × Qoxygen-target, the theoretical cooling capacity consumption is calculated as Qtheoretical = 1.5 × 10 = 15kcal / h. The current maximum available cooling capacity of the cooling module is assessed as Qmaximum-available = 12kcal / h. Since Qtheoretical = 15kcal / h > Qmaximum-available = 12kcal / h, proceed to the next step. The third setting threshold is set to 6℃. The current indoor ambient temperature is 30℃, and the difference between this and the set cooling temperature of 24℃ is 6℃, which equals the third setting threshold. At this point, the cooling-oxygen production coordinated control mode is activated. The cooling capacity shortfall ΔQ is calculated as Qtheoretical - Qmaximum-available = 3kcal / h. Based on ΔQ, calculate the compressor operating frequency increase Δf_coordinated = k11 × ΔQ (k11 is the frequency increase coefficient under coordinated control). Assuming k11 = 0.3 Hz / kcal / h, then Δf_coordinated = 0.3 × 3 = 0.9 Hz. Based on Δf_coordinated, calculate the throttling device opening adjustment Δa_coordinated = k12 × Δf_coordinated (k12 is the opening adjustment coefficient under coordinated control). Assuming k12 = 1.5% / Hz, then Δa_coordinated = 1.5% × 0.9 = 1.35%. Adjusting the compressor frequency to increase by 0.9 Hz increases the throttling device opening by 1.35%. Simultaneously, based on the actual available cooling capacity Q_actual_available = 12 kcal / h, the cooling capacity supply to the oxygen-enriched module and the refrigeration module is proportionally allocated. For example, if the cooling demand weight for the oxygen-enriched module is set to ωoxygen = 0.6, and the cooling demand weight for the refrigeration module is set to ωcooling = 0.4, then the cooling capacity allocated to the oxygen-enriched module, Qoxygen allocation = Qactual available × ωoxygen = 12 × 0.6 = 7.2 kcal / h, and the cooling capacity allocated to the refrigeration module, Qcooling allocation = 12 × 0.4 = 4.8 kcal / h. Based on the relationship between Qoxygen allocation, the required cooling capacity for oxygen production, and the oxygen output, the actual oxygen output, Qoxygen actual = Qoxygen allocation / 1.5 = 7.2 / 1.5 = 4.8 L / min. Simultaneously, based on the relationship between Qcooling allocation, the refrigeration capacity, and the indoor temperature, the operating parameters of the refrigeration module are adjusted to ensure that the indoor temperature gradually approaches the set refrigeration temperature.

[0126] Preferably, the cooling supply to the oxygen-enriched module and the refrigeration module is allocated proportionally based on the actual available cooling capacity, including:

[0127] Calculate the cooling capacity gap between the current maximum available cooling capacity of the cooling module and the actual cooling capacity requirement, and obtain the user-set cooling temperature priority flag and oxygen production target priority flag;

[0128] If the cooling temperature priority flag is high, then the cooling capacity is allocated according to the cooling capacity demand of the cooling module, and the remaining cooling capacity is allocated to the oxygen enrichment module, and the oxygen production target is reduced accordingly.

[0129] If the oxygen production target priority flag is high, then the cooling capacity is allocated first according to the cooling capacity demand of the oxygen enrichment module, and the remaining cooling capacity is allocated to the refrigeration module. The compressor operating frequency and throttling device opening of the refrigeration module are adjusted accordingly.

[0130] If both have the same priority, the load of refrigeration and oxygen production will be reduced according to the ratio of cooling capacity deficit, and the operating parameters of the refrigeration module and the air compressor speed of the oxygen enrichment module will be recalculated.

[0131] It should be noted that the "cooling capacity gap" is the difference between the maximum available cooling capacity of the cooling module and the actual cooling capacity demand, reflecting the degree of insufficient cooling capacity. The "cooling temperature priority flag" and "oxygen production target priority flag" are user-defined parameters indicating the importance of cooling and oxygen production functions, determining their priority in cooling capacity allocation. When the cooling temperature priority is high, the cooling capacity demand of the cooling module is prioritized to ensure stable indoor temperature regulation, while the oxygen production target is appropriately lowered to accommodate insufficient cooling. When the oxygen production target priority is high, the cooling capacity demand of the oxygen enrichment module is prioritized to ensure a stable oxygen supply, while the operating parameters of the cooling module are adjusted to appropriately reduce the cooling effect. When both priorities are equal, the load on cooling and oxygen production is reduced evenly according to the proportion of the cooling capacity gap. By recalculating operating parameters and adjusting the air compressor speed, the system is made to operate stably under the new conditions.

[0132] Specifically, assuming the maximum available cooling capacity of the refrigeration module is 15 kcal / h, the actual cooling demand is 20 kcal / h, and the cooling capacity shortfall ΔQ = 5 kcal / h. The user-set priority flag for cooling temperature is high, and the priority flag for oxygen production target is medium. In this case, cooling capacity is allocated based on the cooling demand of the refrigeration module, i.e., 15 kcal / h is allocated to the refrigeration module, leaving 0 cooling capacity remaining (here, 0 indicates that, including operating losses, the refrigeration module is operating at full capacity, and all cooling capacity generated is used to meet the cooling demand). This is insufficient to meet the cooling demand of the oxygen enrichment module, therefore the oxygen production target needs to be lowered. Based on the relationship between the required cooling capacity for oxygen production and oxygen output, the original cooling capacity demand corresponding to the original oxygen production target is Qoxygen-original-demand = 1.2 × Qoxygen-original-target. Assuming the original oxygen production target is 8 L / min, then Qoxygen-original-demand = 1.2 × 8 = 9.6 kcal / h. Due to insufficient remaining cooling capacity, the oxygen production target is lowered to the new oxygen demand (Q_oxygen_new_target), ensuring that Q_oxygen_new_demand = 1.2 × Q_oxygen_new_target ≤ remaining cooling capacity 0 kcal / h, i.e., Q_oxygen_new_target = 0 L / min. Oxygen production is then paused. If the user-set priority for oxygen production is high and for cooling temperature is medium, cooling capacity is allocated based on the cooling demand of the oxygen-enriched module. Assuming the oxygen-enriched module's cooling demand is 10 kcal / h, the remaining cooling capacity after allocation is 15 kcal / h - 10 kcal / h = 5 kcal / h, which is allocated to the cooling module. Based on the relationship between cooling capacity and indoor temperature, the compressor operating frequency and throttling device opening of the cooling module are adjusted to reduce the cooling capacity to 5 kcal / h, allowing the indoor temperature to gradually rise. When both priorities are equal, the cooling and oxygen production loads are reduced proportionally to the cooling capacity shortfall. Assuming a cooling capacity shortfall ΔQ = 5 kcal / h, a cooling capacity demand weight of ωcold = 0.6 for the refrigeration module, and a cooling capacity demand weight of ωoxygen = 0.4 for the oxygen generation module, then the reduced cooling capacity ΔQcold for the refrigeration module = ΔQ × ωcold = 5 × 0.6 = 3 kcal / h, and the reduced cooling capacity ΔQoxygen for the oxygen generation module = 5 × 0.4 = 2 kcal / h. Recalculating the operating parameters of the refrigeration module, such as the compressor frequency reduction Δfcold = k13 × ΔQcold (where k13 is the refrigeration module frequency reduction coefficient), assuming k13 = 0.2 Hz / kcal / h, then Δfcold = 0.2 × 3 = 0.6 Hz. Simultaneously, based on the reduced cooling capacity ΔQoxygen from the oxygen generation module, calculating the air compressor speed reduction Δnoxygen = ΔQoxygen / k3 (where k3 is the conversion coefficient between cooling capacity and flow rate), assuming k3 = 0.5 kcal / h·L / min, then Δnoxygen = 2 / 0.5 = 4 L / min. Based on the relationship between the air compressor's flow rate and speed, the speed reduction Δn = Δnoxygen / k2 (where k2 is the proportionality coefficient between flow rate and speed) is calculated. Assuming k2 = 2 L / min·r / min, then Δn = 4 / 2 = 2 r / min. Adjusting the air compressor speed to reduce it by 2 r / min achieves a balanced reduction in both cooling and oxygen production loads.

[0133] Preferably, the distribution of cooling capacity satisfies the following relationship:

[0134] When the cooling temperature priority flag is set to high, the final available cooling capacity of the oxygen-enriched module is... Satisfying the relation:

[0135] ;

[0136] When the oxygen production target priority is set to high, the final available cooling capacity of the cooling module is... Satisfying the relation:

[0137] ;

[0138] When both priority flags are the same, the cooling mode and the oxygen-enriched module share the same upper limit of available cooling capacity. Satisfying the relation:

[0139] ;

[0140] Actual cooling capacity distributed by the refrigeration module The actual cooling capacity allocated to the oxygen generation module ;

[0141] in, This indicates the maximum cooling capacity that the cooling module can provide under the current operating conditions. This indicates the cooling capacity requirement of the refrigeration module. This indicates the cooling capacity requirement of the oxygen generation module. This represents the cooling capacity loss coefficient during the operation of the cooling module itself. This represents the cooling loss coefficient of the oxygen generation module during the liquefaction and distillation processes. This indicates the efficiency of cold energy transfer from the refrigeration module to the oxygen generation module. This represents the weighting factor of the cooling module. This represents the weighting factor of the oxygen generation module.

[0142] Understandably, quantifying the cooling capacity allocation scheme through mathematical formulas provides a clear calculation basis for the rational allocation of cooling capacity. When the cooling temperature priority is high, the cooling capacity demand of the cooling module is prioritized, and the available cooling capacity of the oxygen-enriching module is calculated based on the remaining cooling capacity and transmission efficiency. When the oxygen production target priority is high, the cooling capacity demand of the oxygen-enriching module is prioritized, and the available cooling capacity of the cooling module is calculated based on the remaining cooling capacity and loss coefficient. When both priorities are equal, the upper limit of the available cooling capacity shared by both is calculated through weighting factors and loss coefficients, and the cooling capacity is allocated proportionally, making the cooling capacity allocation more precise and rational, and improving the control accuracy and reliability of the air conditioning system.

[0143] Specifically, assuming the maximum available cooling capacity of the cooling module under the current operating conditions. =20kcal / h, cooling capacity requirement of the refrigeration module =15kcal / h, cooling loss coefficient =0.8, Cooling requirement of the oxygen generation module =10kcal / h, cooling loss coefficient =0.7, transmission efficiency =0.9, weighting factor =0.6, =0.4. When the cooling temperature priority flag is high, the final available cooling capacity of the oxygen-enriched module is... =0.9×max(0,20-15 / 0.8)=0.9×max(0,20-18.75)=0.9×1.25=1.125kcal / h. When the oxygen production target priority is high, the final available cooling capacity of the refrigeration module is... =max(0,20-10 / (0.7×0.9))=max(0,20-10 / 0.63)=max(0,20-15.87)=4.13kcal / h. When both priority flags are the same, the upper limit of available cooling capacity is shared by the refrigeration module and the oxygen-enriched module. =20 / (0.6×1 / 0.8+0.4×1 / (0.7×0.9))=20 / (0.6×1.25+0.4×1.587)=20 / (0.75+0.635)=20 / 1.385≈14.44kcal / h. Actual cooling capacity distributed by the refrigeration module. =0.6×14.44≈8.66kcal / h, the actual distributed cooling capacity of the oxygen generation module =0.4×14.44≈5.78kcal / h.

[0144] Preferably, during the distillation separation of the gas-liquid mixture by the distillation column:

[0145] The temperature and pressure at the top and bottom of the distillation column are monitored in real time, and the current actual reflux ratio is calculated based on the detected values ​​of nitrogen purity at the top and oxygen purity at the bottom.

[0146] The actual reflux ratio is compared with the target reflux ratio. If the actual reflux ratio is lower than the target reflux ratio, the opening of the reflux regulating valve is increased based on the difference between the actual reflux ratio and the target reflux ratio to proportionally adjust the rate of change of the reflux liquid volume and increase the reflux liquid volume.

[0147] If the actual reflux ratio is higher than the target reflux ratio, the reflux regulating valve is reduced based on the difference between the actual and target reflux ratios to proportionally adjust the rate of change of the reflux liquid volume and reduce the reflux liquid volume.

[0148] It should be noted that the "distillation column" is a key piece of equipment in the oxygen-enriched module used to separate oxygen and nitrogen. Oxygen and nitrogen are separated through multiple partial vaporizations and condensations of the gas-liquid mixture within the column. The "actual reflux ratio" is the ratio of the reflux volume to the produced volume during distillation, reflecting the separation efficiency of the process. The "target reflux ratio" is an ideal value preset based on oxygen purity requirements. By adjusting the opening of the reflux regulating valve, the reflux volume can be changed, thereby adjusting the actual reflux ratio to approach the target reflux ratio and ensuring the purity of the oxygen product.

[0149] Understandably, real-time monitoring of the distillation column's operating parameters and precise control of the reflux ratio are crucial for ensuring the purity of the oxygen product. During distillation, changes in parameters such as temperature, pressure, nitrogen purity, and oxygen purity all affect the actual reflux ratio, thus impacting oxygen purity. By monitoring these parameters in real-time, calculating the actual reflux ratio, and comparing it to the target reflux, the system can promptly detect deviations. By adjusting the opening of the reflux regulating valve and changing the reflux volume, the actual reflux ratio is restored to near the target value, ensuring the oxygen product's purity meets requirements.

[0150] Specifically, assume the target reflux ratio of the distillation column is 3. Real-time monitoring shows the top temperature of the distillation column is 80℃, the bottom temperature is 100℃, the nitrogen purity at the top is 98%, and the oxygen purity at the bottom is 95%. Based on these parameters, the actual reflux ratio is calculated to be 2.8. Compared to the target reflux ratio of 3, the actual reflux ratio is found to be less than the target reflux ratio, with a difference of 0.2. Based on this difference, the opening of the reflux regulating valve is increased. Assuming the adjustment coefficient per unit of reflux ratio is 5%, the opening of the reflux regulating valve is increased by 1%. After increasing the opening of the reflux regulating valve, the reflux liquid volume increases, causing the actual reflux ratio to gradually approach the target reflux ratio. After a period of adjustment, the actual reflux ratio rises back to 3, at which point the oxygen purity reaches the set value. If at another moment the actual reflux ratio is calculated to be 3.2, which is greater than the target reflux ratio of 3, with a difference of -0.2, then the opening of the reflux regulating valve is decreased by 1%, reducing the reflux liquid volume and lowering the actual reflux ratio back to 3.

[0151] Preferably, it includes: arranging temperature sensor arrays in the airflow channel inlet section, middle section and outlet section of the counterflow heat exchanger to collect temperature distribution data of different cross sections in real time;

[0152] The initial heat exchange efficiency is calculated based on the temperature distribution at the inlet section, and the inlet flow rate and distribution uniformity of the low-temperature nitrogen are adjusted according to the heat exchange efficiency value.

[0153] A dynamic heat exchange model is established based on the temperature distribution in the middle section to predict the remaining heat exchange time required to reach the target temperature. The final heat exchange effect is evaluated based on the temperature distribution in the outlet section, and the temperature field uniformity coefficient and average temperature difference are calculated.

[0154] When the temperature at any measuring point in the outlet section is found to be higher than the critical temperature, the residence time is increased by adjusting the angle of the guide vanes and the cross-sectional area of ​​the flow path inside the heat exchanger. When the difference between the overall temperature of the outlet section and the critical temperature is found to be greater than the preset difference value, the heat exchange intensity is optimized by reducing the nitrogen reflux flow rate and reducing the flow resistance.

[0155] It should be noted that the "counter-current heat exchanger" is a key device in the oxygen-enriched module used for counter-current heat exchange between the second low-temperature, high-pressure air and low-temperature nitrogen. This counter-current heat exchange further reduces the air temperature, bringing it below the critical temperature required for throttling expansion. The "temperature sensor array" consists of multiple temperature sensors arranged at different cross-sections of the airflow channel in the counter-current heat exchanger, used to collect real-time temperature distribution data. The "preliminary heat exchange efficiency" is an indicator of the heat exchange effect in the inlet section, reflecting the degree of heat exchange between the low-temperature nitrogen and air at the inlet. The heat exchange effect can be improved by adjusting the inlet velocity and distribution uniformity of the low-temperature nitrogen. The "heat exchange dynamic model" is a mathematical model established based on the temperature distribution in the intermediate section, used to predict the remaining heat exchange time required to reach the target temperature. The "temperature field uniformity coefficient" and "average temperature difference" are indicators for evaluating the heat exchange effect in the outlet section, reflecting the uniformity of the temperature distribution and the temperature difference between the hot and cold fluids. "Guide plate angle" and "flow cross-sectional area" are internal structural parameters of the heat exchanger. By adjusting them, the flow path and residence time of air in the heat exchanger can be changed, thereby optimizing the heat exchange effect. "Nitrogen reflux flow rate" and "flow resistance" are also factors that affect the heat exchange intensity. By reducing the nitrogen reflux flow rate and reducing the flow resistance, the heat exchange effect can be further optimized.

[0156] Understandably, by arranging temperature sensor arrays at key locations in the countercurrent heat exchanger, the temperature distribution can be monitored in real time, and this data can be used to calculate heat exchange efficiency, perform dynamic model predictions, and evaluate the heat exchange effect. Based on the monitoring and evaluation results, the system can promptly identify problems in the heat exchange process, such as excessively high local temperatures or uneven temperature fields. By adjusting the internal structural parameters of the heat exchanger and the nitrogen reflux flow rate, the heat exchange effect can be optimized to ensure that the air reaches below the critical temperature required for throttling expansion, thereby improving oxygen production efficiency and oxygen purity.

[0157] Specifically, temperature sensor arrays are arranged in the inlet, middle, and outlet sections of the airflow channel of the counter-current heat exchanger. Each array contains multiple temperature sensors to collect temperature data in real time. For example, the temperature distribution collected by the inlet section temperature sensor array is as follows: inlet temperature 1 -10℃, inlet temperature 2 -12℃, inlet temperature 3 -11℃, etc. Based on the inlet section temperature distribution, the preliminary heat exchange efficiency is calculated. Assuming the nitrogen inlet temperature is -30℃, the air inlet temperature is 20℃, and the target air outlet temperature is -15℃, the preliminary heat exchange efficiency is calculated as follows: the actual heat transfer equals the air mass flow rate multiplied by the air specific heat capacity multiplied by (air inlet temperature minus air outlet temperature); the maximum possible heat transfer equals the air mass flow rate multiplied by the air specific heat capacity multiplied by (air inlet temperature minus nitrogen inlet temperature); and the preliminary heat exchange efficiency equals the actual heat transfer divided by the maximum possible heat transfer multiplied by 100%. If the air mass flow rate is 1 kg / s, the specific heat capacity of air is 1 kJ / kg·℃, and the air outlet temperature is -5℃, then the actual heat transfer is 1 × 1 × (20 - (-5)) = 25 kJ / s, the maximum possible heat transfer is 1 × 1 × (20 - (-30)) = 50 kJ / s, and the initial heat exchange efficiency is 25 / 50 × 100% = 50%. Based on the initial heat exchange efficiency of 50%, the heat exchange effect is considered average, and the inlet flow rate and distribution uniformity of the low-temperature nitrogen need to be adjusted. Assume the current inlet flow rate of the low-temperature nitrogen is 2 m / s, and the distribution uniformity is 0.8. By adjusting, the nitrogen inlet flow rate is increased to 2.5 m / s, and the distribution uniformity is optimized to 0.9 to improve the heat exchange effect. In the middle section, the temperature distribution collected by the temperature sensor array is as follows: middle temperature 1 is -15℃, middle temperature 2 is -16℃, middle temperature 3 is -14℃, etc. Based on this data, a dynamic heat exchange model is established to predict the remaining heat exchange time required to reach the target temperature of -20℃. For example, the dynamic model calculates the remaining heat exchange time to be 10 seconds. At the outlet section, the temperature distribution collected by the temperature sensor array is as follows: outlet temperature 1 is -18℃, outlet temperature 2 is -17℃, outlet temperature 3 is -19℃, etc. The temperature field uniformity coefficient is calculated, where the temperature standard deviation is 1℃ and the average temperature at the outlet section is -18℃. The temperature field uniformity coefficient is then 1 - 1 / 18 ≈ 0.944, indicating good temperature field uniformity. The average temperature difference is calculated as follows: assuming the air inlet temperature is 20℃, the nitrogen outlet temperature is -25℃, the air outlet temperature is -18℃, and the nitrogen inlet temperature is -30℃. The average temperature difference is calculated as follows: ((air inlet temperature - nitrogen outlet temperature) - (air outlet temperature - nitrogen inlet temperature)) divided by the natural logarithm ((air inlet temperature - nitrogen outlet temperature) / (air outlet temperature - nitrogen inlet temperature)).Substituting the values, we get: ((20-(-25))-(-18-(-30))) / ln((20-(-25)) / (-18-(-30)))=(45-12) / ln(45 / 12)≈33 / 1.45≈22.76℃. If the temperature at a certain measuring point in the outlet section is found to be -10℃, which is higher than the critical temperature of -15℃, then the angle of the guide vanes inside the heat exchanger is adjusted from 30° to 45°, and the flow cross-sectional area is increased from 0.1m² to 0.12m², which prolongs the residence time of air in the heat exchanger and enhances the heat exchange effect. If the difference between the overall temperature of the outlet section and the critical temperature is monitored to be -18℃ - (-15℃) = -3℃, and the absolute value is greater than the preset difference value of 2℃, then the nitrogen reflux flow rate is reduced from 5m³ / h to 4m³ / h, the flow resistance is reduced from 10Pa to 8Pa, the heat exchange intensity is optimized, and the air temperature is ensured to reach below the critical temperature required for throttling expansion.

[0158] Preferably, the dynamic model of heat exchange satisfies the following relationship:

[0159] ;

[0160] The temperature field uniformity coefficient satisfies the following relationship:

[0161] , ;

[0162] The average temperature difference satisfies the following relationship:

[0163] ;

[0164] in, Indicates the remaining heat exchange time. Indicates the target critical temperature. This indicates the average temperature of the middle section. Indicates air density, Indicates air volume flow rate, This indicates the specific heat capacity of air at constant pressure. Indicates the overall heat transfer coefficient. Indicates the heat exchange area. This represents the logarithmic mean temperature difference. Indicates the temperature field uniformity coefficient. Indicates the standard deviation of temperature. This indicates the average temperature at the outlet section. Indicates the number of measurement points. This represents the temperature at the i-th measuring point. Indicates the air inlet temperature. Indicates the air outlet temperature. Indicates the nitrogen inlet temperature. This indicates the nitrogen outlet temperature.

[0165] Understandably, by establishing a dynamic model of heat exchange, mathematical expressions for the temperature field uniformity coefficient, and average temperature difference, a precise quantitative description and control basis for the heat exchange process of the counter-current heat exchanger can be provided. The dynamic model of heat exchange can predict the remaining time required to reach the target temperature, providing a reference for real-time control of the system; the temperature field uniformity coefficient and average temperature difference can evaluate the heat exchange effect and guide the optimization and adjustment of the system. The application of these mathematical models enables the system to control the heat exchange process more precisely, improve heat exchange efficiency, and ensure that the air temperature can stably reach below the critical temperature required for throttling expansion, providing reliable cooling support for the oxygen production process.

[0166] Specifically, assuming the target critical temperature =-20℃, average temperature in the middle section =-15℃, air density =1.29 kg / m³, air volumetric flow rate =0.5 m³ / s, specific heat capacity of air at constant pressure =1.005 kJ / kg·℃, overall heat transfer coefficient =50W / (m²·℃), heat exchange area =2m², logarithmic mean temperature difference =25℃. The remaining heat exchange time is calculated based on the heat exchange dynamic model. =((-20-(-15))×1.29×0.5×1.005×1000) / (50×2×25)≈-1.314s. Since time cannot be negative, this indicates that under the current operating conditions, the air temperature has reached or fallen below the target temperature, and further heat exchange is unnecessary. At the outlet section, the collected temperature data are Toutlet1=-18℃, Toutlet2=-17℃, Toutlet3=-19℃, Toutlet4=-18℃, and Toutlet5=-17℃, i.e., n=5 measuring points. Calculate the average temperature of the outlet section. =(-18+(-17)+(-19)+(-18)+(-17)) / 5=(-99) / 5=-19.8℃. The calculated temperature standard deviation is... ≈2.136℃. Temperature field uniformity coefficient. =1-2.136 / 19.8≈1-0.108≈0.892, indicating that the temperature field uniformity is good, and the calculated average temperature difference is... =((20-(-25))-(-18-(-30))) / (ln(20-(-25)) / (-18-(-30)))=((45)-(12)) / (ln(45) / 12)≈33 / 1.45≈22.76℃.

[0167] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0168] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioning control method for assisting oxygen inhalation, the control method being applied to the air conditioner, the air conditioner comprising a refrigeration module and an oxygen enrichment module, the refrigeration module comprising an evaporator, a compressor, a condenser, and a throttling device, characterized in that, The oxygen-enriched module includes an air compressor, a precooler, a countercurrent converter, a throttling expansion device, and a distillation column, which are connected in sequence. The control method includes: When the oxygen-enriched mode activation command is received: The compressor of the refrigeration module and the air compressor of the oxygen-enriched module are started to generate high-temperature and high-pressure refrigerant and high-temperature and high-pressure compressed air, respectively. The speed of the air compressor is adjusted based on the remaining cooling capacity of the refrigeration module to control the flow rate of the high-temperature and high-pressure compressed air, so that the flow rate of the high-temperature and high-pressure compressed air matches the cooling capacity available for air liquefaction. The remaining cooling capacity refers to the excess cooling capacity of the refrigeration module after meeting the indoor cooling demand. The precooler performs a preliminary heat exchange between the high-temperature, high-pressure compressed air and the condenser of the refrigeration module to obtain a first low-temperature, high-pressure air. Then, it performs a deep heat exchange with the cooling capacity provided by the evaporator to obtain a second low-temperature, high-pressure air, which is then delivered to the counter-current heat exchanger. The countercurrent heat exchanger exchanges the second low-temperature high-pressure air with the low-temperature nitrogen returning from the distillation column in a countercurrent heat exchange and monitors the temperature of the air after the heat exchange until the temperature of the air after the heat exchange reaches below the critical temperature required for throttling expansion, thus obtaining cryogenic air and delivering it to the throttling expansion device. The throttling expansion device throttles and expands the cryogenic air, and adjusts the opening of the expansion valve based on the pressure difference and temperature change before and after throttling to maintain the optimal liquefaction rate, thereby obtaining a gas-liquid mixture and delivering it to the distillation column. The distillation column performs distillation separation on the gas-liquid mixture, controls the purity of the oxygen product by adjusting the reflux ratio, outputs oxygen product of specified purity, and obtains low-temperature nitrogen gas to be refluxed to the countercurrent heat exchanger for cold energy recovery. When the user sets the cooling temperature first and then sets the oxygen production target: The remaining cooling capacity of the cooling module is determined based on the set cooling temperature. Based on the remaining cooling capacity and the set oxygen production target, the speed of the air compressor is adjusted to control the flow rate of the high-temperature and high-pressure compressed air; When the user sets the oxygen production target first and then sets the cooling temperature: The required cooling capacity allocation is determined based on the set oxygen production target; The operating parameters of the refrigeration module are adjusted based on the required cooling capacity allocation and the set refrigeration temperature. The operating parameters include the compressor operating frequency, the opening degree of the throttling device, and the refrigerant distribution flow rate between the condenser and the evaporator.

2. The air conditioning control method for assisted oxygen therapy according to claim 1, characterized in that, When the user sets the cooling temperature first and then sets the oxygen production target: Monitor the superheat parameter at the evaporator outlet. When the superheat parameter is greater than a first set threshold, it is determined to be a state of insufficient utilization of cooling capacity. Calculate the difference between the set cooling temperature and the indoor ambient temperature. When the difference is greater than the second set threshold, it is determined to be a high cooling load state. When both insufficient cooling capacity utilization and high cooling load are detected simultaneously, it is determined that the remaining cooling capacity of the cooling module is insufficient. The required compressor frequency increase is calculated based on the difference between the customized cooling temperature and the indoor ambient temperature, and the target opening degree of the throttling device is calculated based on the frequency increase. Adjust the compressor operating frequency and the opening of the throttling device to maintain the evaporator outlet superheat within the optimal superheat range; Based on the adjusted cooling output of the refrigeration module, the maximum supported oxygen production capacity of the oxygen enrichment module is recalculated, and the speed of the air compressor is adjusted accordingly.

3. The air conditioning control method for assisted oxygen therapy according to claim 1, characterized in that, When a user sets an oxygen production target first and then sets a cooling temperature, and the remaining cooling capacity in the current cooling mode cannot meet the oxygen production target: Calculate the theoretical cooling capacity required for the oxygen production target and assess the current maximum available cooling capacity of the cooling module. When the theoretical cooling capacity consumption is less than or equal to the maximum available cooling capacity, execute control according to the user-set oxygen production target and cooling temperature. When the theoretical cooling capacity consumption exceeds the maximum available cooling capacity: If the difference between the current indoor ambient temperature and the set cooling temperature is less than the third set threshold, the cooling capacity requirement of the oxygen-enriched module will be prioritized. The compressor operating frequency will be increased according to the size of the cooling capacity gap, and the opening of the throttling device will be adjusted according to the increase in frequency to increase the total cooling capacity output of the cooling module. If the difference between the current indoor ambient temperature and the set cooling temperature is greater than or equal to the third set threshold, the cooling-oxygen production coordinated control mode is activated. The compressor operating frequency increase is calculated based on the size of the cooling capacity gap, and the opening of the throttling device is adjusted accordingly based on the frequency increase. At the same time, the cooling capacity supply of the oxygen enrichment module and the cooling module is proportionally allocated based on the actual available cooling capacity.

4. The air conditioning control method for assisted oxygen therapy according to claim 3, characterized in that, The cooling supply to the oxygen-enriched module and the refrigeration module is proportionally allocated based on the actual available cooling capacity, including: Calculate the cooling capacity gap between the current maximum available cooling capacity of the cooling module and the actual cooling capacity requirement, and obtain the user-set cooling temperature priority flag and oxygen production target priority flag; If the cooling temperature priority flag is high, then the cooling capacity is allocated according to the cooling capacity demand of the cooling module, and the remaining cooling capacity is allocated to the oxygen enrichment module, and the oxygen production target is reduced accordingly. If the oxygen production target priority flag is high, then the cooling capacity is allocated first according to the cooling capacity demand of the oxygen enrichment module, and the remaining cooling capacity is allocated to the refrigeration module. The compressor operating frequency and throttling device opening of the refrigeration module are adjusted accordingly. If both have the same priority, the load of refrigeration and oxygen production will be reduced according to the ratio of cooling capacity deficit, and the operating parameters of the refrigeration module and the air compressor speed of the oxygen enrichment module will be recalculated.

5. The air conditioning control method for assisted oxygen therapy according to claim 4, characterized in that, The distribution of cooling capacity satisfies the following relationship: When the cooling temperature priority flag is set to high, the final available cooling capacity of the oxygen-enriched module is... Satisfying the relation: ； When the oxygen production target priority is set to high, the final available cooling capacity of the cooling module is... Satisfying the relation: ； When both priority flags are the same, the cooling mode and the oxygen-enriched module share the same upper limit of available cooling capacity. Satisfying the relation: ； Actual cooling capacity distributed by the refrigeration module The actual cooling capacity allocated to the oxygen generation module ; in, This indicates the maximum cooling capacity that the cooling module can provide under the current operating conditions. This indicates the cooling capacity requirement of the refrigeration module. This indicates the cooling capacity requirement of the oxygen generation module. This represents the cooling capacity loss coefficient during the operation of the cooling module itself. This represents the cooling loss coefficient of the oxygen generation module during the liquefaction and distillation processes. This indicates the efficiency of cold energy transfer from the refrigeration module to the oxygen generation module. This represents the weighting factor of the cooling module. This represents the weighting factor of the oxygen generation module.

6. The air conditioning control method for assisted oxygen therapy according to claim 1, characterized in that, During the distillation separation of the gas-liquid mixture by the distillation column: The temperature and pressure at the top and bottom of the distillation column are monitored in real time, and the current actual reflux ratio is calculated based on the detected values ​​of nitrogen purity at the top and oxygen purity at the bottom. The actual reflux ratio is compared with the target reflux ratio. If the actual reflux ratio is lower than the target reflux ratio, the opening of the reflux regulating valve is increased based on the difference between the actual reflux ratio and the target reflux ratio to proportionally adjust the rate of change of the reflux liquid volume and increase the reflux liquid volume. If the actual reflux ratio is higher than the target reflux ratio, the reflux regulating valve is reduced based on the difference between the actual and target reflux ratios to proportionally adjust the rate of change of the reflux liquid volume and reduce the reflux liquid volume.

7. The air conditioning control method for assisted oxygen therapy according to claim 1, characterized in that, include: Temperature sensor arrays are arranged in the airflow channel inlet section, middle section and outlet section of the counterflow heat exchanger to collect temperature distribution data of different cross sections in real time. The initial heat exchange efficiency is calculated based on the temperature distribution at the inlet section, and the inlet flow rate and distribution uniformity of the low-temperature nitrogen are adjusted according to the heat exchange efficiency value. A dynamic heat exchange model is established based on the temperature distribution in the middle section to predict the remaining heat exchange time required to reach the target temperature. The final heat exchange effect is evaluated based on the temperature distribution in the outlet section, and the temperature field uniformity coefficient and average temperature difference are calculated. When the temperature at any measuring point in the outlet section is found to be higher than the critical temperature, the residence time is increased by adjusting the angle of the guide vanes and the cross-sectional area of ​​the flow path inside the heat exchanger. When the difference between the overall temperature of the outlet section and the critical temperature is found to be greater than the preset difference value, the heat exchange intensity is optimized by reducing the nitrogen reflux flow rate and reducing the flow resistance.

8. The air conditioning control method for assisted oxygen therapy according to claim 7, characterized in that, The dynamic model of heat exchange satisfies the following relationship: ； The temperature field uniformity coefficient satisfies the following relationship: ， ； The average temperature difference satisfies the following relationship: ； in, Indicates the remaining heat exchange time. Indicates the target critical temperature. This indicates the average temperature of the middle section. Indicates air density, Indicates air volume flow rate, This indicates the specific heat capacity of air at constant pressure. Indicates the overall heat transfer coefficient. Indicates the heat exchange area. This represents the logarithmic mean temperature difference. Indicates the temperature field uniformity coefficient. Indicates the standard deviation of temperature. This indicates the average temperature at the outlet section. Indicates the number of measurement points. This represents the temperature at the i-th measuring point. Indicates the air inlet temperature. Indicates the air outlet temperature. Indicates the nitrogen inlet temperature. This indicates the nitrogen outlet temperature.

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