Reheating dehumidification control system and air conditioner

Abstract

The utility model discloses a reheating dehumidification control system and an air conditioner, the reheating dehumidification control system is suitable for a distributed air conditioner, the distributed air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger and a fan, an outdoor throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger, and the fan corresponds to the indoor heat exchanger. The reheating dehumidification control system comprises an indoor throttling device, and the indoor throttling device is arranged on the indoor heat exchanger and can divide a flow path of the indoor heat exchanger into a reheating section flow path used for converting inlet air into hot air and a dehumidification section flow path used for converting inlet air into cold air in a dehumidification mode. Based on the distributed air supply air conditioner, the flow path of the indoor heat exchanger is divided into the reheating section and the dehumidification section through the indoor throttling device, the reheating section and the dehumidification section are used for carrying out flow path layout and partition design to achieve distributed air supply with the refrigerating and heating performance and the dehumidification performance of the air conditioner, and the cold-feeling-free constant-temperature dehumidification effect is achieved; therefore, the reheating dehumidification effect of the air conditioner is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a reheating and dehumidifying control system and an air conditioner. Background Art

[0002] The operation mode of the dehumidification mode of existing air conditioner products is set according to the lowest value of the temperature set by the air conditioner. In the dehumidification mode, the indoor fan runs at a low wind speed and the compressor runs intermittently. However, there are some differences in the on-off time settings of the compressors of air conditioners of different brands. This dehumidification mode is essentially no different from the refrigeration mode. That is to say, when the dehumidification mode is running, the air conditioner will still intermittently blow out cold air, which will make people feel uncomfortable in climatic conditions where the temperature is not high. And because dehumidification and refrigeration are coupled together, it is impossible for traditional air conditioners to achieve the function of only dehumidifying without refrigerating. Therefore, it is necessary to design and research air conditioners with constant temperature dehumidification function, which can not only broaden the use functions of air conditioners, improve the utilization rate of equipment, but also avoid economic losses caused by high humidity environment and reduce the occurrence of diseases, thereby improving people's living conditions. Therefore, air conditioners with constant temperature dehumidification function have good development and application prospects.

[0003] At present, the technology for the constant temperature dehumidification function of household cabinet air conditioners in the industry mainly focuses on neutralizing the excessive temperature reduction during the dehumidification process by means of compressor frequency, fan speed or combined with electric heating, etc. However, most of these solutions are controlled from the control method and do not consider the design of the indoor heat exchanger structure and flow path, resulting in insufficient reheating and dehumidifying effect. Therefore, how to improve the reheating and dehumidifying effect of air conditioners is a problem that needs to be solved by those skilled in the art. Summary of the Utility Model

[0004] The embodiment of the utility model provides a reheating and dehumidifying control system and an air conditioner, aiming to improve the reheating and dehumidifying effect of the air conditioner.

[0005] In the first aspect, the embodiment of the utility model provides a reheating and dehumidifying control system, which is applicable to a distributed air conditioner. The distributed air conditioner includes an indoor heat exchanger, an outdoor heat exchanger and a fan. An outdoor throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger. The fan is arranged corresponding to the indoor heat exchanger. The reheating and dehumidifying control system includes:

[0006] An indoor throttling device, which is arranged on the indoor heat exchanger and can divide the flow path of the indoor heat exchanger into a reheating section flow path for converting a part of the incoming air into hot air and a dehumidifying section flow path for converting another part of the incoming air into cold air in the dehumidification mode. The fan is used to mix the hot air and the cold air and output mixed air.

[0007] Further, the reheat section flow path is located above the indoor throttling device, and the dehumidification section flow path is located below the indoor throttling device.

[0008] Further, the number of paths of the reheat section flow path is less than the number of paths of the dehumidification section flow path.

[0009] Further, the ratio of the number of paths of the reheat section flow path to the number of paths of the dehumidification section flow path is 1:1.5 to 1:3.

[0010] Further, the ratio of the number of paths of the reheat section flow path to the number of paths of the dehumidification section flow path is 1:2 to 1:3.

[0011] Further, the indoor throttling device is an electronic expansion valve.

[0012] Further, the indoor throttling device is a dehumidification solenoid valve.

[0013] Further, the outdoor throttling device is an electronic expansion valve.

[0014] In a second aspect, an embodiment of the present invention provides an air conditioner, including an indoor heat exchanger, an outdoor heat exchanger, and a fan. An outdoor throttling device is provided between the indoor heat exchanger and the outdoor heat exchanger. The fan is arranged corresponding to the indoor heat exchanger, and further includes the reheat dehumidification control system according to any one of the above.

[0015] Further, the air outlet of the air conditioner is an I-shaped air outlet.

[0016] An embodiment of the present invention provides a reheat dehumidification control system and an air conditioner. The reheat dehumidification control system is applicable to a distributed air conditioner. The distributed air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, and a fan. An outdoor throttling device is provided between the indoor heat exchanger and the outdoor heat exchanger. The fan is arranged corresponding to the indoor heat exchanger. The reheat dehumidification control system includes: an indoor throttling device, which is arranged on the indoor heat exchanger and can divide the flow path of the indoor heat exchanger into a reheat section flow path for converting a part of the incoming air into hot air and a dehumidification section flow path for converting another part of the incoming air into cold air in the dehumidification mode. The fan is used to mix the hot air and the cold air and output mixed air. Based on the distributed air supply air conditioner, the embodiment of the present invention conducts reheat dehumidification design. By setting the indoor throttling device, the flow path of the indoor heat exchanger is divided into a reheat section flow path and a dehumidification section flow path, and then through the reheat section and the dehumidification section, the flow path layout and zoning design are carried out to realize the distributed air supply that takes into account the refrigeration, heating, and dehumidification performance of the air conditioner, achieving the effect of cold-sensation-free constant temperature dehumidification, thereby improving the reheat dehumidification effect of the air conditioner. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 It is the system schematic diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0019] Figure 2 It is the flow path design diagram of the indoor heat exchanger in the prior art;

[0020] Figure 3 It is the first flow path design diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0021] Figure 4 It is the second flow path design diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0022] Figure 5 It is the third flow path design diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0023] Figure 6 It is the fourth flow path design diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0024] Figure 7 It is the fifth flow path design diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0025] Figure 8 It is the control flow schematic diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0026] Figure 9 It is the control logic diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0027] Figure 10 It is the sub-control flow schematic diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention;

[0028] Figure 11 It is another control flow schematic diagram of a reheating and dehumidifying control system provided by the embodiment of the present invention. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0031] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0032] It should be further understood that the term "and / or" used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] Please refer to the following Figure 1 , an embodiment of the present invention provides a reheating and dehumidifying control system applicable to a distributed air conditioner. The distributed air conditioner includes an indoor heat exchanger 1, an outdoor heat exchanger 2, and a fan 5. An outdoor throttling device 3 is arranged between the indoor heat exchanger 1 and the outdoor heat exchanger 2. The fan 5 is arranged corresponding to the indoor heat exchanger 1. The reheating and dehumidifying control system includes:

[0034] An indoor throttling device 4 is arranged on the indoor heat exchanger 1 and can divide the flow path of the indoor heat exchanger 1 into a reheating section flow path 11 for converting a part of the incoming air into hot air and a dehumidifying section flow path 12 for converting another part of the incoming air into cold air in the dehumidification mode. The fan 5 is used to mix the hot air and the cold air to output mixed air.

[0035] In this embodiment, an indoor throttling device 4 is added to the indoor heat exchanger 1 of the air conditioner. In this way, in the cooling / heating mode, the indoor throttling device 4 can be opened to the maximum opening degree to ensure the normal operation of the cooling / heating mode. In the dehumidification mode, the indoor throttling device 4 divides the flow path of the indoor heat exchanger 1 into a reheating section flow path 11 for converting a part of the incoming air into hot air and a dehumidification section flow path 12 for converting another part of the incoming air into cold air. In this way, the heat exchange performance of the reheating section flow path 11 and the dehumidification section flow path 12 can be controlled by adjusting the opening degree of the indoor throttling device 4, so as to achieve the effect of reheating and dehumidifying. Combined with Figure 1 , Figure 1 in the air (N state) flowing through the indoor heat exchanger 1, a part is reheated by the reheating section (i.e., the process of N state → B state), and another part is cooled and dehumidified by the dehumidification section (i.e., the process of N state → A state). Subsequently, these two parts of air are mixed in the volute of the fan 5 (centrifugal fan) and then blown out as the mixed air of O state, and its equivalent process is N state → O state. Specifically, the indoor throttling device 4 described in this embodiment can be an electronic expansion valve or a dehumidification solenoid valve, that is, the heat exchange performance of the reheating section flow path 11 and the dehumidification section flow path 12 in the indoor heat exchanger 1 is controlled by the opening degree of the electronic expansion valve or the dehumidification solenoid valve. At the same time, the outdoor throttling device 3 can also be an electronic expansion valve.

[0036] This embodiment is based on the refrigerant state change and heat exchange characteristics of the indoor heat exchanger 1 in the distributed air supply air conditioner to carry out the reheating and dehumidifying design. By setting the indoor throttling device 4, the flow path of the indoor heat exchanger 1 is divided into a reheating section flow path 11 and a dehumidification section flow path 12. Then, through the flow path layout and zoning design of the reheating section and the dehumidification section, the distributed air supply that takes into account the cooling, heating and dehumidification performance of the air conditioner is realized, and the effect of cold-sensation-free constant temperature dehumidification is achieved, thereby improving the reheating and dehumidifying effect of the air conditioner. It should be noted that the reheating and dehumidifying control system provided in this embodiment is particularly suitable for the dehumidification control of household cabinet air conditioners.

[0037] It should also be noted that in some application scenarios, before adopting the reheating and dehumidifying control system provided in this embodiment, it is necessary to judge whether the fan system of the air conditioner is in the form of mixing hot and cold air and then sending it out, that is, whether the centrifugal fan 5 is adopted; and judge whether the air outlet of the air conditioner is an I-shaped air outlet, so as to avoid the situation that the cross-flow fan of the I-shaped machine blows out cold air directly. That is to say, the reheating and dehumidifying control system provided in this embodiment is particularly suitable for air conditioners adopting the fan 5 and having an I-shaped air outlet.

[0038] In one embodiment, the reheating section flow path 11 is located above the indoor throttling device 4, and the dehumidification section flow path 12 is located below the indoor throttling device 4.

[0039] In addition, the number of paths of the reheating section flow path 11 is less than the number of paths of the dehumidification section flow path 12.

[0040] Specifically, the ratio of the number of paths of the reheating section flow path 11 to that of the dehumidifying section flow path 12 is 1:1.5 to 1:3.

[0041] In this embodiment, considering that the evaporator flow path is vertically arranged in two rows front and back, its upper and lower lengths are relatively long and the flow path is relatively long, so the pressure loss of the flow path splitting and recombining is relatively obvious. In addition, arranging front and back requires making the inner row of the heat exchanger the reheating part and the outer row of the heat exchanger the dehumidifying part, which is contrary to the original flow path design, thus seriously affecting the convective heat transfer efficiency between the air and the heat exchanger. Therefore, the front-back series flow path design scheme is not suitable for the reheating and dehumidifying control system. Hence, this embodiment adopts the form of up-down series to arrange the reheating section flow path 11 and the dehumidifying section flow path 12. Further, considering that when the reheating section is below the indoor throttling device 4, part of the condensed water will be heated and return to the air again during the process of flowing through the reheating section, thereby causing the dehumidification amount to decrease instead, and this phenomenon will be more obvious as the rotational speed of the blower 5 increases. Therefore, on the basis of up-down series, it is determined that the reheating section flow path 11 is above and the dehumidifying section flow path 12 is below.

[0042] In addition, since the refrigerant enters the evaporator in a low-pressure and low-temperature gas-liquid two-phase mixed state, its dryness is small when it first enters the evaporator. As the evaporation process proceeds, the gas-phase component continuously increases, the liquid-phase component continuously decreases, and the dryness becomes larger and larger until it is completely vaporized and enters the superheat section for superheating. If the refrigerant is branched into multiple paths when it enters the evaporator, due to the small dryness and specific volume of the refrigerant at the inlet, the multiple paths will cause the flow velocity in the pipe to become smaller and the heat transfer coefficient to decrease, which will affect the heat transfer effect of the refrigerant. Therefore, having fewer or no branches at the evaporator inlet is beneficial to heat transfer. When the dryness gradually increases, the gaseous refrigerant becomes more, the specific volume becomes larger, the volume of the refrigerant increases, and the flow velocity also increases accordingly. Therefore, to reduce the flow resistance of the refrigerant, multiple branches can be designed to reduce the flow velocity.

[0043] In summary, the reheating and dehumidifying control system provided in this embodiment selects a "less → more" flow path design on the basis of up-down two-section series. That is, in the direction of the refrigerant flow on the indoor side, the part of the indoor heat exchanger 1 upstream of the indoor throttling device 4 is the reheating section flow path 11, mainly with "less" paths, and the part of the indoor heat exchanger 1 downstream is the dehumidifying section flow path 12, mainly with "more" paths.

[0044] In an actual application scenario, taking a 72 distributed air supply air conditioner as an example, the original flow path design of the indoor heat exchanger 1 is as Figure 2 shown. This embodiment adopts the flow path 1 (2 paths → 4 paths, 2 paths is the number of paths of the reheating section flow path 11, 4 paths is the number of paths of the dehumidifying section flow path 12, the same below) as shown in Figure 3 and as shown in Figure 4The reheating and dehumidification control system is designed with the shown flow path 2 (3-way → 3-way), and tested under the rated cooling (indoor 27°C / 19°C, outdoor 35°C / 24°C) and rated heating (indoor 20°C / —, outdoor 7°C / 6°C) conditions. The test results of capacity, power and energy efficiency are shown in Table 1 below. It can be seen from Table 1 that compared with the original flow path, adding an indoor throttling device 4 to the indoor heat exchanger 1 will lead to the attenuation of cooling and heating performance. However, compared with flow path 2 (3-way → 3-way), the attenuation of the cooling performance of flow path 1 (2-way → 4-way) is relatively low, but the heating performance is significantly improved. Therefore, it can be proved that the design of the reheating and dehumidification flow path in the "less → more" manner in this embodiment has certain advantages.

[0045]

[0046] Table 1

[0047] In another actual application scenario, for the above-mentioned up-and-down series connection and less → more flow path design method, the partition forms of the reheating section and the dehumidification section are analyzed. As Figure 4 shown, flow path 2 adopts a partition flow path design with the reheating section at the bottom and the dehumidification section at the top. As Figure 5 shown, flow path 3 adopts a partition flow path design with the reheating section at the top and the dehumidification section at the bottom. Theoretically, it can be analyzed that the performance of flow path 3 is better than that of flow path 2. The reason is that if the reheating section is set at the lower end of the indoor throttling device 4, part of the condensed water will be heated and return to the air again when flowing through the reheating section, resulting in a decrease in the dehumidification capacity, and this phenomenon will be more obvious with the increase of the rotational speed of the fan 5. The specific performance and dehumidification performance test results are shown in Table 2 below. It can be seen from Table 2 that under the condition of equivalent cooling performance, compared with flow path 2, the dehumidification capacity of flow path 3 is greatly improved. Therefore, it is proved that adopting the partition flow path design with the reheating section at the top and the dehumidification section at the bottom will make the advantages of the reheating and dehumidification control system more obvious.

[0048]

[0049] Table 2

[0050] Further, by exploring the influence of the flow path change of the indoor heat exchanger 1 on the refrigeration, heating, and dehumidification performance of the air conditioner, the segmented position of the optimal dehumidification flow path is determined to achieve the effect of constant-temperature dehumidification without cold sensation. Based on the above-mentioned "less → more" flow path and the partitioned flow path design with the reheating section on top and the dehumidification section at the bottom, the segmented position between the reheating section and the dehumidification section of the indoor heat exchanger 1 is designed. Specifically, since there is a restrictive relationship between the influence of the reheating section and the dehumidification section on the refrigeration, heating, and dehumidification performance, it is necessary to reasonably design the dehumidification flow path according to the actual placement position of the indoor heat exchanger 1 and the wind speed distribution, and minimize the influence of the reheating section flow path 11 design on the system performance. Theoretically analyzed, the selection of the segmented position of the dehumidification section is affected by multiple factors. Increasing the flow path of the dehumidification section can reduce the influence of the flow path change on the system performance, but it will cause an increase in the dehumidification temperature drop and affect comfort. Increasing the flow path of the reheating section can reduce the indoor temperature drop during dehumidification, but it will cause a relatively large attenuation of the system performance. Therefore, there is a restrictive relationship in the position selection of the reheating section and the dehumidification section, and the dehumidification flow path design needs to be reasonably considered.

[0051] Taking the 72 distributed air supply air conditioner as an example, combined with Figure 5 - Figure 7 , the flow paths 3 (1:1.8), 4 (1:2.3), and 5 (1:2.6) with the ratio of the flow path number of the reheating section to the dehumidification section in the range of 1:1.5 to 1:3 are respectively selected for analysis, and the analysis results shown in Table 3 below are obtained. According to Table 3, compared with the original flow path, the capacity attenuation of flow paths 3 and 4 is relatively large, while the heating energy efficiency of flow path 5 is slightly improved while ensuring comparable refrigeration capacity. That is to say, when the ratio of the number of the reheating section flow path to the dehumidification section flow path is 1:2 to 1:3, the effect is better. Of course, specific products can be adjusted accordingly according to the original flow path design and system configuration.

[0052]

[0053] Table 3

[0054] As Figure 8 shown, when the reheat dehumidification control is performed based on the reheat dehumidification control system in the embodiment of the present invention, it specifically includes: steps S101 to S104.

[0055] Step S101, when the air conditioner operates in the dehumidification mode, perform reheating and dehumidification treatments through the reheating section flow path 11 and the dehumidification section flow path 12 respectively, obtain the current air outlet temperature and the preset air outlet temperature of the air conditioner, and then calculate the temperature difference between the current air outlet temperature and the preset air outlet temperature;

[0056] Step S102, determine whether the temperature difference is within the preset dehumidification temperature difference range;

[0057] Step S103, if so, operate according to the current dehumidification mode;

[0058] Step S104: If not, perform dehumidification control according to a preset dehumidification load correction strategy; wherein, the dehumidification load correction strategy is to control the compressor frequency of the air conditioner and the opening degree of the indoor throttling device 4 according to the relationship between the temperature difference and the preset dehumidification temperature difference range.

[0059] In this embodiment, when the dehumidification mode is running, the throttling device on the outdoor side is fully open, and the high-temperature and high-pressure refrigerant directly enters the indoor unit, and throttling is carried out by relying on the indoor throttling device. Part of the indoor heat exchanger 1 upstream of the indoor throttling device 4 is the reheating section, and part of the indoor heat exchanger 1 downstream of the indoor throttling device 4 is the dehumidification section. Subsequently, based on the design of the reheating section on the upper side and the dehumidification section on the lower side, and the number of reheating sections being less than the number of dehumidification sections from less to more, the load during dehumidification is controlled, that is, the indoor fan speed, the outdoor fan speed, the indoor valve opening degree control, and the compressor frequency are controlled. Since the indoor fan speed can be set by the user himself, if the user does not set the wind speed when the dehumidification mode is turned on, it can be defaulted that the indoor fan runs at the maximum speed and the outdoor fan runs at the minimum speed. Therefore, when the dehumidification mode is running, the opening degree of the indoor throttling device 4 and the frequency of the compressor can be controlled based on the air outlet temperature of the air conditioner to achieve the effect of constant temperature dehumidification without cold feeling and improve the reheating dehumidification effect of the air conditioner.

[0060] Specifically, in combination with Figure 9 , first detect and record the current air outlet temperature t 出风 of the air conditioner, the set temperature t 设定 of the air conditioner, as well as data such as the indoor fan speed R, the indoor valve opening degree P, the compressor operating speed f, and the indoor environmental humidity W. Subsequently, calculate the temperature difference △t between the current air outlet temperature t 出风 and the set temperature t 设定 of the air conditioner, △t = t 出风 - t 设定 , and compare the temperature difference △t with the set dehumidification temperature difference range [△t1, △t2]. When the temperature difference △t is within the set dehumidification temperature difference range [△t1, △t2], it runs according to the default settings; when the temperature difference △t is not within the set dehumidification temperature difference range [△t1, △t2], it enters the dehumidification load correction control program.

[0061] In a specific embodiment, as Figure 10 shown, the step S104 includes: steps S201 to S202.

[0062] Step S201: When the temperature difference is less than the minimum value of the preset dehumidification temperature difference range, reduce the compressor frequency of the air conditioner and increase the opening degree of the indoor throttling device 4;

[0063] Step S202: When the temperature difference is greater than the maximum value of the preset dehumidification temperature difference range, increase the compressor frequency of the air conditioner and decrease the opening degree of the indoor throttling device 4.

[0064] That is to say, if t 出风 -t 设定 <△t1, it indicates that the outlet air temperature is lower than the comfortable range of the set temperature, that is, the tube temperature of the indoor heat exchanger 1 is relatively low at this time. Therefore, the outlet air temperature can be increased by reducing the compressor frequency △f and increasing the opening degree of the indoor valve △P. If t 出风 -t 设定 >△t2, it indicates that the outlet air temperature is higher than the comfortable range of the set temperature, that is, the tube temperature of the indoor heat exchanger 1 is relatively high at this time. Therefore, the outlet air temperature can be reduced by increasing the compressor frequency △f and decreasing the opening degree of the indoor valve △P. Specifically, the air conditioner set temperature t 设定 can be set according to the comfortable temperature of the indoor environment. For example, it can be set to 24 - 26°C. △t1 in the dehumidification temperature difference range [△t1, △t2] can be set to -2 - 0°C, and △t2 can be set to 0 - 2°C. In addition, the compressor operating frequency f in the dehumidification mode can be set to 24 - 40 hz. When adjusting the compressor frequency, the frequency can be increased or decreased by an amplitude of △f of 0 - 4 hz. The opening degree P of the indoor throttling device 4 in the dehumidification mode can be set to 50 - 150P. When adjusting the opening degree of the indoor throttling device 4, the opening degree can be increased or decreased by an amplitude of △P of 0 - 20P.

[0065] Further, as Figure 11 shown, after the step S104, it further includes: steps S301 - S303.

[0066] Step S301: Obtain the indoor environmental humidity and compare the indoor environmental humidity with the preset dehumidification lower limit humidity;

[0067] Step S302: When the indoor environmental humidity is greater than the preset dehumidification lower limit humidity, continue to perform dehumidification control according to the preset dehumidification load correction strategy;

[0068] Step S303: When the indoor environmental humidity is less than or equal to the preset dehumidification lower limit humidity, stop running the dehumidification mode.

[0069] After executing the dehumidification load correction strategy, compare the relationship between the indoor environmental humidity W and the dehumidification lower limit humidity W 1 When the dehumidification lower limit humidity W 1 ≥ the indoor environmental humidity W, it indicates that the indoor environmental humidity has been reduced to the lower limit humidity W 1, so the current dehumidification mode can be exited. Otherwise, the dehumidification control can continue according to the dehumidification load correction strategy until the lower limit of dehumidification humidity W 1 ≥ the indoor environmental humidity W, and the dehumidification mode is exited. Specifically, the indoor environmental humidity W is generally 40% - 80%, and the lower limit of dehumidification humidity W 1 can be set to 40% - 45%.

[0070] In an actual application scenario, taking a 72 distributed air supply air conditioner as an example, the flow path 5 involved in the solution shown in Figure 7 is adopted. For the rated dehumidification condition of 27°C / 60% in the inner loop, assuming the set temperature in the dehumidification mode is 26°C, the air outlet temperature of the air conditioner operates according to the default setting between 24°C and 28°C. At this time, the compressor frequency is 30 hz and the inner unit valve opening is 100P. If the air outlet temperature of the air conditioner ≤ 24°C, the air outlet temperature of the air conditioner can be increased by reducing the compressor frequency to 26 hz or increasing the valve opening to 120P, or adjusting both at the same time. When the air outlet temperature of the air conditioner is between 24°C and 28°C and the indoor humidity has dropped to the lower limit humidity of the current condition, the dehumidification mode can be exited.

[0071] The embodiment of the present utility model also provides an air conditioner, including an indoor heat exchanger, an outdoor heat exchanger and a fan. An outdoor throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger. The fan is arranged corresponding to the indoor heat exchanger, and further includes the reheating dehumidification control system as described in any one of the above.

[0072] Further, the air outlet of the air conditioner is an I-shaped air outlet.

[0073] The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, refer to the description in the method part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0074] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A reheat dehumidification control system, suitable for a distributed air conditioner, the distributed air conditioner comprising an indoor heat exchanger, an outdoor heat exchanger and a fan, an outdoor throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger, the fan is arranged corresponding to the indoor heat exchanger, characterized in that: The reheat dehumidification control system comprises: An indoor throttling device is provided on the indoor heat exchanger, and can divide the flow path of the indoor heat exchanger into a reheating section flow path for converting a part of the incoming air into hot air and a dehumidification section flow path for converting another part of the incoming air into cold air in a dehumidification mode, and the fan is used for mixing the hot air and cold air to output mixed air.

2. The reheat dehumidification control system according to claim 1, characterized in that: The reheat section flow path is located above the indoor throttling device, and the dehumidification section flow path is located below the indoor throttling device.

3. The reheat dehumidification control system according to claim 1, characterized in that: The number of the reheating section flow paths is less than the number of the dehumidification section flow paths.

4. The reheat dehumidification control system according to claim 3, characterized in that: The ratio of the number of the reheating section flow path to the number of the dehumidification section flow path is 1:1.5 to 1:

3.

5. The reheat dehumidification control system according to claim 4, characterized in that: The ratio of the number of the reheating section flow path to the number of the dehumidification section flow path is 1:2 to 1:

3.

6. The reheat dehumidification control system according to claim 1, characterized in that: The indoor throttling device is an electronic expansion valve.

7. The reheat dehumidification control system according to claim 1, characterized in that: The indoor throttling device is a dehumidification solenoid valve.

8. The reheat dehumidification control system according to claim 1, characterized in that: The outdoor throttling device is an electronic expansion valve.

9. An air conditioner, characterized in that: It includes an indoor heat exchanger, an outdoor heat exchanger and a fan, an outdoor throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger, the fan is arranged corresponding to the indoor heat exchanger, and also includes the reheat dehumidification control system as described in any one of claims 1 to 8.

10. The air conditioner according to claim 9, characterized in that: The air outlet of the air conditioner is an I-type air outlet.

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