Large-temperature-difference anti-condensation method, system and equipment of air mixing unit and medium

Abstract

The invention provides a large-temperature-difference condensation prevention method, system and equipment of a mixed fan unit and a medium, and belongs to the technical field of heating ventilation air conditioners. The method comprises the steps that in a winter heating and humidifying mode, the fresh air temperature and humidity and the return air temperature and humidity are detected, and whether the condensation risk exists or not is judged according to the fresh air temperature and humidity and the return air temperature and humidity; when it is determined that the condensation risk exists, the opening degree of the first air valve assembly and the opening and closing of the second air valve assembly are adjusted, and the compressor is driven to enter a heating state; according to the set air supply temperature, the operation frequency of the compressor is adjusted, and according to the set dew point temperature, the input proportion of the humidifier is adjusted; and the exhaust pressure of the compressor is detected, and the opening degree of the second air valve assembly is adjusted according to the exhaust pressure so that the exhaust pressure can be maintained within the set pressure range. The condensation phenomenon occurring during large-temperature-difference air mixing can be avoided, and the energy consumption of a unit is reduced.

Description

Technical Field

[0001] The present application relates to the field of heating, ventilation and air conditioning technology, and in particular to a large temperature difference anti-condensation method, system, equipment and medium for a mixed air unit. Background Art

[0002] In the low-temperature environment of winter, in traditional mixed-air air-conditioning units, the temperature difference between fresh air and return air is large, which will cause condensation in the mixed air. Usually, the fresh air is heated before mixing to avoid condensation. However, the use of heating methods such as electric heating or steam heating will increase the energy consumption of the unit. If the air is forced to mix, it will cause filter blockage, filtration failure and bacterial growth. Summary of the Invention

[0003] The main purpose of the embodiments of the present application is to propose a large temperature difference anti-condensation method, system, equipment and medium for a mixed air unit to solve the condensation phenomenon that occurs when the mixed air has a large temperature difference and reduce the energy consumption of the unit.

[0004] To achieve the above objectives, one aspect of an embodiment of the present application provides a large temperature difference condensation prevention method for a mixed air unit, the method comprising: an indoor unit of the unit is provided with a first cavity and a second cavity, the first cavity is provided with a first damper assembly, the second cavity is provided with a second damper assembly, and the second cavity is connected to the first cavity via the second damper assembly; the method comprising:

[0005] Obtaining a mode selection instruction, and determining, according to the mode selection instruction, that the current operating mode is a winter heating and humidification mode;

[0006] In the winter heating and humidification mode, detecting the fresh air temperature and humidity and the return air temperature and humidity, and judging whether there is a condensation risk based on the fresh air temperature and humidity and the return air temperature and humidity;

[0007] When it is determined that there is a condensation risk, the opening of the first air valve assembly is adjusted, the opening and closing of the second air valve assembly are adjusted, and the compressor is driven to enter a heating state;

[0008] According to the set air supply temperature, the operating frequency of the compressor is adjusted, and according to the set dew point temperature, the input ratio of the humidifier is adjusted;

[0009] The exhaust pressure of the compressor is detected, and the opening of the second air valve assembly is adjusted according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

[0010] In some embodiments, determining whether there is a condensation risk based on the fresh air temperature and humidity and the return air temperature and humidity includes:

[0011] According to the set mixing ratio step, the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated multiple times to obtain multiple relative humidities;

[0012] According to the plurality of relative humidities, it is confirmed whether one of the relative humidities is greater than the set saturation humidity to determine whether there is a condensation risk.

[0013] In some embodiments, the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated multiple times according to the set mixing ratio step to obtain multiple relative humidities, including:

[0014] Obtaining the set initial mixing ratio, and determining the current fresh air mixing ratio and the current return air mixing ratio based on the set initial mixing ratio;

[0015] Performing mixed calculation processing on the fresh air temperature and humidity and the return air temperature and humidity according to the current fresh air mixing ratio and the current return air mixing ratio to determine the current relative humidity;

[0016] According to the set mixing ratio step, the current fresh air mixing ratio and the current return air mixing ratio are updated to calculate the next relative humidity and obtain multiple relative humidities.

[0017] In some embodiments, the first air valve assembly includes a fresh air valve, a first return air valve, and a second return air valve; and adjusting the opening of the first air valve assembly includes:

[0018] Adjust the opening of the fresh air valve according to the set fresh air opening;

[0019] Close the first return air valve and open the second return air valve.

[0020] In some embodiments, the second air valve assembly includes a first air inlet valve and a second air inlet valve; and adjusting the opening and closing of the second air valve assembly includes:

[0021] Close the first air inlet valve and open the second air inlet valve.

[0022] In some embodiments, adjusting the opening of the second air valve assembly according to the exhaust pressure includes:

[0023] adjusting the opening of the first air inlet valve and the opening of the second air inlet valve according to the exhaust pressure;

[0024] The opening of the first air inlet valve is inversely correlated with the opening of the second air inlet valve.

[0025] In some embodiments, the sum of the fresh air mixing ratio and the return air mixing ratio is 100%.

[0026] To achieve the above objectives, another aspect of the present invention provides a large temperature difference anti-condensation system for a mixed air unit, the system comprising:

[0027] A mode selection module is used to obtain a mode selection instruction and determine that the current operating mode is a winter heating and humidification mode according to the mode selection instruction;

[0028] A judgment module, configured to detect the temperature and humidity of fresh air and the temperature and humidity of return air in the winter heating and humidification mode, and to judge whether there is a condensation risk based on the temperature and humidity of fresh air and the temperature and humidity of return air;

[0029] a first regulating module, configured to, when determining that there is a condensation risk, adjust the opening of the first damper assembly and the opening of the second damper assembly, and drive the compressor to enter a heating state;

[0030] The second control module is used to adjust the operating frequency of the compressor according to the set air supply temperature and adjust the input ratio of the humidifier according to the set dew point temperature;

[0031] The third control module is used to detect the exhaust pressure of the compressor and adjust the opening of the first air inlet valve and the second air inlet valve according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

[0032] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned method when executing the computer program.

[0033] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above-mentioned method when executed by a processor.

[0034] The embodiments of the present application include at least the following beneficial effects: The present application provides a large temperature difference anti-condensation method, system, equipment and medium for a mixed air unit. The scheme analyzes whether there is a condensation risk by analyzing the fresh air temperature and humidity and the return air temperature and humidity. Compared with the prior art in which the fresh air dry-bulb temperature is detected to be lower than a certain value, thereby starting fresh air preheating or mixed air reheating, the opening of the air valve assembly is adjusted and the operating frequency of the compressor is adjusted to increase the air temperature entering the indoor unit, reduce the energy consumption of electric preheating or steam heating, and adjust the input ratio of the humidifier to avoid condensation and increase the input amount of the rear humidifier, thereby achieving a double energy-saving effect. The opening of the second air valve assembly is adjusted again by the exhaust pressure of the compressor to make the exhaust pressure within the high-efficiency operating range and at an appropriate refrigerant anti-condensation temperature level, solving the condensation phenomenon in the mixed air cavity during large temperature difference mixed air, the high energy consumption operation of using electric preheating to heat the fresh air part to prevent condensation, the filter clogging and filtration failure phenomenon, and the electrical safety problems of the electrical components in the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a flow chart of a large temperature difference anti-condensation method for a mixed air unit provided in an embodiment of the present application;

[0036] Figure 2 This is a structural diagram of the air mixing unit provided in an embodiment of the present application;

[0037] Figure 3 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of the present application.

[0038] Figure numerals: 100, compressor, 200, four-way valve, 300, outdoor heat exchanger, 400, first indoor heat exchanger, 500, second indoor heat exchanger, 600, indoor unit, 610, first cavity, 611, fresh air valve, 612, first return air valve, 613, second return air valve, 620, second cavity, 621, first air inlet valve, 622, second air inlet valve, 710, first temperature and humidity sensor, 720, second temperature and humidity sensor, 730, exhaust pressure detector, 810, oil separator, 820, gas-liquid separator, 830, liquid separator, 840, one-way valve, 850, flow regulating valve, 860, electronic expansion valve. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are merely examples of systems and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0040] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0041] The terms "at least one", "plurality", "each", "any", etc. used in this application include "at least one", "two" or more, "plurality" or "each", "any" or "any one", "each" or "any one" as used herein.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0043] Figure 2 2 is a structural diagram of an air mixing unit provided in an embodiment of the present application. In an embodiment of one aspect of the present application, the air mixing unit includes: an indoor unit and a main circuit.

[0044] The main circuit includes a compressor 100, a four-way valve 200, an outdoor heat exchanger 300, a second indoor heat exchanger 500 and a first indoor heat exchanger 400 which are connected in sequence to form a circuit. The first indoor heat exchanger 400 is used to receive the first mixed air for heat exchange processing, and the second indoor heat exchanger 500 is used to receive the second mixed air for heat exchange processing and discharge air into the room.

[0045] The indoor unit is provided with a first cavity 610 for arranging the first indoor heat exchanger 400 and a second cavity 620 for arranging the second indoor heat exchanger 500 .

[0046] The first cavity 610 is provided with a first air valve assembly, and the second cavity 620 is provided with a second air valve assembly. The second cavity 620 is communicated with the first cavity 610 through the second air valve assembly.

[0047] The first air valve assembly includes: a fresh air valve 611, a first return air valve 612 and a second return air valve 613. The second air valve assembly includes: a first inlet air valve 621 and a second inlet air valve 622.

[0048] The second cavity 620 is in communication with the first cavity 610 via a first air inlet valve 621 and a second air inlet valve 622 .

[0049] The outdoor fresh air introduced by the fresh air valve 611 and the indoor return air introduced by the first return air valve 612 form a first mixed air. The outlet air of the first indoor heat exchanger 400 and the indoor return air introduced by the second return air valve 613 form a second mixed air. The first air inlet valve 621 and the second air inlet valve 622 are respectively used to introduce the second mixed air into the second cavity 620. The outlet air of the second indoor heat exchanger 500 and the second mixed air introduced by the first air inlet valve 621 form a third mixed air.

[0050] The air mixing unit also includes: an oil separator 810, a gas-liquid separator 820, a liquid separator head 830, a one-way valve 840, a flow regulating valve 850, an electronic expansion valve 860, a humidifier, a first temperature and humidity sensor 710, a second temperature and humidity sensor 720 and an exhaust pressure detector 730.

[0051] The first temperature and humidity sensor 710 is located at the fresh air valve 611. The first temperature and humidity sensor 710 is used to obtain the fresh air temperature and fresh air humidity to obtain the fresh air temperature and humidity.

[0052] The second temperature and humidity sensor 720 is located at the first return air valve 612. The second temperature and humidity sensor 720 is used to obtain the return air temperature and return air humidity to obtain the return air temperature and humidity.

[0053] The exhaust pressure detector 730 is located at the exhaust end of the compressor 100. The exhaust pressure detector 730 is used to obtain the pressure at the exhaust end of the compressor 100 to obtain the exhaust pressure.

[0054] The humidifier is disposed in the second cavity 620 of the indoor unit and is used to humidify the air.

[0055] The oil separator 810 is connected to the compressor 100 and the four-way valve 200, respectively. The gas-liquid separator 820 is connected to the four-way valve 200 and the compressor 100, respectively. One end of the liquid separator 830 is connected to the first indoor heat exchanger 400, and the other end of the liquid separator 830 is connected to the one-way valve 840, the flow control valve 850, and the second indoor heat exchanger 500. The electronic expansion valve 860 is connected to the second indoor heat exchanger 500, the outdoor heat exchanger 300, and the flow control valve 850, respectively.

[0056] Figure 1 This is an optional flow chart of a large temperature difference anti-condensation method for a mixed air unit provided in an embodiment of the present application. Figure 1 The method may include but is not limited to steps S100 to S500.

[0057] Step S100, obtaining a mode selection instruction, and determining that the current operating mode is a winter heating and humidification mode according to the mode selection instruction;

[0058] Step S200: In the winter heating and humidification mode, the fresh air temperature and humidity and the return air temperature and humidity are detected, and whether there is a condensation risk is determined based on the fresh air temperature and humidity and the return air temperature and humidity.

[0059] In step S300, when it is determined that there is a condensation risk, the opening of the first damper assembly is adjusted, the opening and closing of the second damper assembly are adjusted, and the compressor is driven to enter a heating state.

[0060] Step S400: adjusting the operating frequency of the compressor according to the set air supply temperature, and adjusting the input ratio of the humidifier according to the set dew point temperature.

[0061] Step S500: detecting the exhaust pressure of the compressor, and adjusting the opening of the second air valve assembly according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

[0062] Steps S100 to S500 shown in the embodiment of the present application analyze whether there is a condensation risk by analyzing the fresh air temperature and humidity and the return air temperature and humidity. Compared with the prior art in which the fresh air dry-bulb temperature is detected to be lower than a certain value, thereby starting fresh air preheating or mixed air reheating, the opening of the air valve assembly is adjusted, and the operating frequency of the compressor is adjusted to increase the air temperature entering the indoor unit, reduce the energy consumption of electric preheating or steam heating, and adjust the input ratio of the humidifier to avoid condensation and increase the input amount of the rear humidifier, thereby achieving a double energy-saving effect. The opening of the second air valve assembly is adjusted again through the exhaust pressure of the compressor to make the exhaust pressure within the high-efficiency operating range and the appropriate refrigerant anti-condensation temperature level, which solves the condensation phenomenon in the mixed air cavity when the mixed air has a large temperature difference, the high energy consumption operation of using electric preheating to heat the fresh air part to prevent condensation, the filter clogging and filtration failure phenomenon, and the electrical safety problems of the electrical components of the cavity.

[0063] In some embodiments of S100, the mixed air unit is controlled to start, and in response to a mode selection instruction, the operating mode of the unit is determined according to the instruction to select the corresponding operating mode for the current winter environment, thereby performing temperature and humidity control for heating and humidification.

[0064] In one embodiment, the current operating mode may be a winter heating and humidification mode.

[0065] That is, according to the mode selection instruction, the current operating mode is judged, and after the current operating mode is determined, the condensing fan in the indoor unit is operated.

[0066] In some embodiments of S200 , it may be determined that condensation may exist in the current environment based on the current operating mode, and corresponding environmental data is detected in the current operating mode.

[0067] The first temperature and humidity sensor detects the fresh air temperature and humidity, that is, the fresh air temperature and fresh air humidity.

[0068] The return air temperature and humidity, ie, the return air temperature and return air humidity, are detected by the second temperature and humidity sensor.

[0069] When there is a large temperature difference between the fresh air temperature and humidity and the return air temperature and humidity, the unit will experience mixed air condensation. The presence of condensation risk can be determined by the fresh air temperature, fresh air humidity, return air temperature and return air humidity.

[0070] In one embodiment, a plurality of corresponding mixing ratios are obtained according to the set mixing ratio step size, and the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated according to the corresponding mixing ratios. Whether the relative humidity is close to the set saturation humidity is used to determine whether there is a condensation risk.

[0071] In some embodiments of S300 , when the risk of condensation is confirmed, a large temperature difference anti-condensation strategy is executed.

[0072] According to the large temperature difference anti-condensation strategy, the opening of the first air valve assembly is adjusted, the opening and closing of the second air valve assembly is controlled, and the compressor is controlled to enter the heating state.

[0073] In one embodiment, when condensation risk is confirmed, the fresh air valve is opened to the set fresh air opening, the first return air valve is closed, and the second return air valve is opened to reduce the amount of return air with lower temperature and humidity entering the indoor unit. The opening adjustment logic of the first return air valve is opposite to that of the second return air valve, meaning the openings of the two valves are inversely correlated. The first inlet air valve is closed, and the second inlet air valve is opened. The opening adjustment logic of the first inlet air valve is opposite to that of the second inlet air valve, meaning the openings of the two valves are inversely correlated, and the compressor operates in heating mode.

[0074] Through this embodiment, the temperature of the air entering the indoor unit is increased, the energy consumption of electric preheating or steam heating is reduced, and the problem of the unit heating the fresh air and then the mixed air in turn when the air is mixed with a large temperature difference is solved. The secondary heating process of the high-temperature mixed air effectively avoids excessive condensation of the fresh air.

[0075] In some embodiments of S400, the compressor is controlled to operate according to the set supply air temperature, and the operating frequency of the compressor is adjusted. The humidifier operates according to the set dew point temperature, and the humidifier input ratio, that is, the operating power, is adjusted, wherein the dew point temperature can be the set room dew point or the set supply air dew point.

[0076] For example, when the set supply air temperature is 25° C., when the supply air temperature detected by the supply air temperature detector is lower than the set supply air temperature, the operating frequency of the compressor is increased.

[0077] In some embodiments of S500, the exhaust pressure is obtained by an exhaust pressure detector. Based on the exhaust pressure, the opening of the second damper assembly is adjusted again to maintain the exhaust pressure within a set pressure range, so that the exhaust pressure is within a high-efficiency operating range and at an appropriate refrigerant anti-condensation temperature level.

[0078] The set pressure range is 17 bar to 23 bar.

[0079] In one embodiment, the opening adjustment logic of the first air inlet valve is opposite to that of the second air inlet valve, that is, the openings of the two air valves are inversely correlated. According to the exhaust pressure and, the openings of the first air inlet valve and the second air inlet valve are adjusted to make the high-pressure pressure within the high-efficiency energy-efficient operating range and at an appropriate refrigerant anti-condensation temperature level, so that the high-temperature and high-pressure exhaust medium in the unit can quickly preheat the fresh air and achieve a rapid condensation effect.

[0080] In some embodiments of one aspect of the present invention, in S200, the process of determining the condensation risk includes:

[0081] S210 , performing multiple mixing calculations on the fresh air temperature and humidity and the return air temperature and humidity according to the set mixing ratio step to obtain multiple relative humidities.

[0082] S220: Determine whether one of the relative humidities is greater than the set saturation humidity based on the multiple relative humidities to determine whether there is a condensation risk.

[0083] In some embodiments of S210, since the specific opening of the fresh air valve and the specific opening of the return air valve are uncertain during the initial operation, that is, the proportion of fresh air volume and the proportion of return air volume entering the unit are actually uncertain, the fresh air and return air mixed in any proportion are detected to determine whether there is a risk of condensation.

[0084] According to the set mixing ratio step, multiple corresponding mixing ratios are obtained, and the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated according to the multiple corresponding mixing ratios to obtain multiple relative humidities.

[0085] In some embodiments of S220 , it is determined whether there is a relative humidity greater than a set saturation humidity among multiple relative humidities to determine whether there is a condensation risk.

[0086] The saturated humidity is set at 95%.

[0087] In some embodiments of one aspect of the present invention, in S210, performing multiple mixing calculations on the fresh air temperature and humidity and the return air temperature and humidity according to the set mixing ratio step size includes:

[0088] S211, obtaining a set initial mixing ratio, and determining a current fresh air mixing ratio and a current return air mixing ratio based on the set initial mixing ratio.

[0089] S212, performing mixed calculation processing on the fresh air temperature and humidity and the return air temperature and humidity based on the current fresh air mixing ratio and the current return air mixing ratio to determine the current relative humidity;

[0090] S213: Update the current fresh air mixing ratio and the current return air mixing ratio according to the set mixing ratio step size to calculate the next relative humidity and obtain multiple relative humidities.

[0091] In some embodiments of S211, the set initial mixing ratio is obtained, and the current fresh air mixing ratio matching the fresh air temperature and humidity and the current return air mixing ratio matching the return air temperature and humidity are determined based on the set initial mixing ratio.

[0092] In some embodiments of S112, the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated based on the current fresh air mixing ratio and the current return air mixing ratio to obtain the current relative humidity.

[0093] Since temperature can be linear but humidity can be nonlinear, a hybrid calculation is performed using the psychrometric diagram to determine relative humidity.

[0094] For example, in a psychrometric chart, the fresh air state point is determined based on the fresh air temperature and humidity, and the return air state point is determined based on the return air temperature and humidity. Based on the current fresh air mixing ratio and the current return air mixing ratio, a mixed calculation is performed on the moisture content at the fresh air state point and the moisture content at the return air state point to calculate the mixed humidity. Similarly, a mixed enthalpy value is calculated, and based on the mixed humidity content and the mixed enthalpy value, a state point after the mixed calculation is determined from the psychrometric chart. The current relative humidity is determined from this state point.

[0095] In some embodiments of S213, the current fresh air mixing ratio and the current return air mixing ratio are updated with the set mixing ratio step, and the next relative humidity is calculated based on the updated current fresh air mixing ratio and the current return air mixing ratio to obtain multiple relative humidities.

[0096] The sum of the fresh air mixing ratio and the return air mixing ratio is 100%. The mixing ratio step size can be 1%, 3%, or 5%. In this embodiment, there is no restriction on the mixing ratio step size.

[0097] For example, when the fresh air temperature is 15°C, the fresh air humidity is 50%, the return air temperature is 20°C, the return air humidity is 60%, and the set mixing ratio step is 5%, based on the set initial mixing ratio, the current fresh air mixing ratio is determined to be 5% and the current return air mixing ratio is determined to be 95%.

[0098] Based on a fresh air mixing ratio of 5% and a return air mixing ratio of 95%, a fresh air temperature of 15°C, a fresh air humidity of 50%, a return air temperature of 20°C and a return air humidity of 60% are mixed and calculated to obtain the current relative humidity.

[0099] With a set mixing ratio step of 5%, the current fresh air mixing ratio of 5% and the current return air mixing ratio of 95% are updated, and the updated current fresh air mixing ratio is 10% and the current return air mixing ratio is 90%.

[0100] Based on a 10% fresh air mixing ratio and a 90% return air mixing ratio, a mixed calculation is performed for a fresh air temperature of 15°C, a fresh air humidity of 50%, a return air temperature of 20°C, and a return air humidity of 60% to obtain the next relative humidity. This is repeated in this way to obtain multiple relative humidities, so as to determine whether one of the relative humidities exceeds the set saturation humidity and thus determine whether there is a condensation risk.

[0101] Optionally, refer to Figure 2 In S300, the process of the compressor entering the heating state includes:

[0102] When the four-way valve is reversed and energized, the unit operates in the heating cycle direction. The refrigerant is pressurized and discharges high-temperature, high-pressure, superheated gas from the compressor. After oil separation, the high-temperature, superheated refrigerant flows out through the four-way valve DE and flows to the first indoor heat exchanger to condense the high-temperature liquid. After passing through the liquid separator, a part of the refrigerant continues to condense through the second indoor heat exchanger according to the built-in algorithm, and the other part is bypassed and merged through the one-way valve and the flow control valve in turn. It is then reduced in pressure and throttled by the electronic expansion valve. The low-temperature two-phase refrigerant enters the outdoor heat exchanger for evaporation and heat absorption. After becoming superheated steam, it flows through the four-way valve CS to the gas-liquid separator. The gaseous refrigerant coming out of the gas-liquid separator returns to the compressor.

[0103] The outdoor fresh air is mixed for the first time through the fresh air valve and part of the return air of the first return air valve with adjusted opening, and enters the first indoor heat exchanger for heating treatment. The air fluid processed by the first indoor heat exchanger is mixed for the second time with the other part of the return air with adjusted opening. The mixed air fluid is distributed through the first air inlet valve and the second air inlet valve with adjusted opening. A part of the air fluid flowing through the second air inlet valve is heated for the second time through the second indoor heat exchanger. After heating, it is mixed for the third time with the other part of the air fluid flowing through the bypass of the first air inlet valve, and finally supplied to the room.

[0104] This mode mainly operates through a heat pump, automatically adapting to changes in indoor and outdoor heat loads to calculate and allocate the optimal heating air volume and heating area. Compared with the traditional purification constant air volume and constant area heat exchange method, it has a wider operating range and is more energy-efficient. When excessive heat is not needed, it can also be bypassed through the first air inlet valve to further reduce the air side wind resistance and achieve low-carbon economic operation.

[0105] Another embodiment of the present application further provides a large temperature difference anti-condensation system for a mixed air unit, which can implement the large temperature difference anti-condensation method for the above-mentioned mixed air unit. The system includes: a mode selection module, a judgment module, a first control module, a second control module and a third control module.

[0106] The mode selection module is used to obtain a mode selection instruction and determine that the current operating mode is a winter heating and humidification mode according to the mode selection instruction;

[0107] The judgment module is used to detect the temperature and humidity of the fresh air and the temperature and humidity of the return air in the winter heating and humidification mode, and judge whether there is a condensation risk based on the temperature and humidity of the fresh air and the temperature and humidity of the return air;

[0108] The first control module is configured to adjust the opening of the first damper assembly and the opening of the second damper assembly when it is determined that there is a condensation risk, and drive the compressor to enter a heating state;

[0109] The second control module is used to adjust the operating frequency of the compressor according to the set air supply temperature, and adjust the input ratio of the humidifier according to the set dew point temperature;

[0110] The third control module is used to detect the exhaust pressure of the compressor and adjust the openings of the first air inlet valve and the second air inlet valve according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

[0111] It can be understood that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0112] The working principle and application method of such units, such as the addition of liquid receivers, liquid cooling drive plates, and jet enthalpy increase economizers to the refrigeration system, are all within the scope of protection of this application;

[0113] Compressors with variable or fixed frequency and oil or oil-free series, including piston, rotor, scroll, screw, centrifugal, magnetic suspension, gas suspension and other compressors are within the scope of protection of this application;

[0114] By using this method, a fluorine pump cycle is introduced, and a series or parallel connection is adopted to further realize the natural cooling technology. Whether it is a liquid pump or an air pump, a centrifugal pump or a gear pump, etc., it is within the scope of protection of this application;

[0115] By using this method, the introduction of a multi-connected system with two or more evaporators connected in parallel is within the scope of protection of this application;

[0116] Cooling methods including air cooling, water cooling, direct (indirect) evaporation condensation, condensation heat storage or a combination thereof are all within the scope of protection of this application;

[0117] Refrigeration methods including direct evaporation of cold air, direct evaporation of cold water, direct evaporation of cold storage, or a combination thereof are all within the scope of protection of this application;

[0118] The modification of the internal unit by adding functional segment components or adjusting the arrangement order of functional segments is within the scope of protection of this application;

[0119] All types of humidification using the isenthalpic or isothermal principle are within the scope of protection of this application;

[0120] Adding a constant air volume device to the fresh air inlet to provide constant hygienic fresh air is within the scope of protection of this application;

[0121] Using this method, multiple system combinations using a rotating defrost strategy to solve defrost fluctuations are all within the scope of protection of this application.

[0122] Another embodiment of the present application provides an electronic device comprising a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned large temperature difference condensation prevention method for a mixed air unit. The electronic device can be any smart terminal, including a tablet computer and an in-vehicle computer.

[0123] It can be understood that the contents of the above method embodiments are applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0124] See also Figure 3 , Figure 3 The hardware structure of an electronic device according to another embodiment is shown. The electronic device includes:

[0125] The processor may be implemented as a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0126] The memory can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory and is called by the processor to execute the large temperature difference anti-condensation method for the mixed air unit in the embodiments of this application;

[0127] Input / output interface, used to realize information input and output;

[0128] Communication interface, used to realize communication interaction between this device and other devices, which can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, Wi-Fi, Bluetooth, etc.);

[0129] The bus transmits information between the various components of the device (such as the processor, memory, input / output interfaces, and communication interfaces);

[0130] The processor, memory, input / output interface and communication interface are connected to each other through a bus within the device.

[0131] Another embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the large temperature difference anti-condensation method of the above-mentioned mixed air unit.

[0132] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0133] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0134] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0135] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0136] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0137] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the above units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or units, which can be electrical, mechanical or other forms.

[0138] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A large temperature difference anti-condensation method for a mixed air unit, characterized in that: The indoor unit of the unit is provided with a first cavity and a second cavity, the first cavity is provided with a first damper assembly, the second cavity is provided with a second damper assembly, and the second cavity is connected to the first cavity through the second damper assembly; the method includes: Obtaining a mode selection instruction, and determining, according to the mode selection instruction, that the current operating mode is a winter heating and humidification mode; In the winter heating and humidification mode, detecting the fresh air temperature and humidity and the return air temperature and humidity, and judging whether there is a condensation risk based on the fresh air temperature and humidity and the return air temperature and humidity; When it is determined that there is a condensation risk, the opening of the first air valve assembly is adjusted, the opening and closing of the second air valve assembly are adjusted, and the compressor is driven to enter a heating state; According to the set air supply temperature, the operating frequency of the compressor is adjusted, and according to the set dew point temperature, the input ratio of the humidifier is adjusted; The exhaust pressure of the compressor is detected, and the opening of the second air valve assembly is adjusted according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

2. The method according to claim 1, characterized in that The determining whether there is a condensation risk based on the fresh air temperature and humidity and the return air temperature and humidity includes: According to the set mixing ratio step, the fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated multiple times to obtain multiple relative humidities; According to the plurality of relative humidities, it is confirmed whether one of the relative humidities is greater than the set saturation humidity to determine whether there is a condensation risk.

3. The method according to claim 2, characterized in that The fresh air temperature and humidity and the return air temperature and humidity are mixed and calculated multiple times according to the set mixing ratio step to obtain multiple relative humidity, including: Obtaining the set initial mixing ratio, and determining the current fresh air mixing ratio and the current return air mixing ratio based on the set initial mixing ratio; Performing mixed calculation processing on the fresh air temperature and humidity and the return air temperature and humidity according to the current fresh air mixing ratio and the current return air mixing ratio to determine the current relative humidity; According to the set mixing ratio step, the current fresh air mixing ratio and the current return air mixing ratio are updated to calculate the next relative humidity and obtain multiple relative humidities.

4. The method according to claim 1, wherein The first air valve assembly includes a fresh air valve, a first return air valve, and a second return air valve; and adjusting the opening of the first air valve assembly includes: Adjust the opening of the fresh air valve according to the set fresh air opening; Close the first return air valve and open the second return air valve.

5. The method according to claim 1, characterized in that The second air valve assembly includes a first air inlet valve and a second air inlet valve; and adjusting the opening and closing of the second air valve assembly includes: Close the first air inlet valve and open the second air inlet valve.

6. The method according to claim 5, characterized in that The adjusting the opening of the second air valve assembly according to the exhaust pressure includes: adjusting the opening of the first air inlet valve and the opening of the second air inlet valve according to the exhaust pressure; The opening of the first air inlet valve is inversely correlated with the opening of the second air inlet valve.

7. The method according to claim 3, characterized in that The sum of the fresh air mixing ratio and the return air mixing ratio is 100%.

8. A large temperature difference anti-condensation system for a mixed air unit, characterized in that: The system comprises: A mode selection module is used to obtain a mode selection instruction and determine that the current operating mode is a winter heating and humidification mode according to the mode selection instruction; A judgment module, configured to detect the temperature and humidity of fresh air and the temperature and humidity of return air in the winter heating and humidification mode, and to judge whether there is a condensation risk based on the temperature and humidity of fresh air and the temperature and humidity of return air; a first regulating module, configured to, when determining that there is a condensation risk, adjust the opening of the first damper assembly and the opening of the second damper assembly, and drive the compressor to enter a heating state; The second control module is used to adjust the operating frequency of the compressor according to the set air supply temperature and adjust the input ratio of the humidifier according to the set dew point temperature; The third control module is used to detect the exhaust pressure of the compressor and adjust the opening of the first air inlet valve and the second air inlet valve according to the exhaust pressure to maintain the exhaust pressure within a set pressure range.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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