Control method of air conditioning unit and air conditioning unit

Abstract

The invention provides a control method of an air conditioning unit and the air conditioning unit. The air conditioning unit is provided with a plurality of air supply outlets, a cabin is divided into a plurality of areas from top to bottom, and each area is at least communicated with one air supply outlet. Adjusting the target temperature or the target humidity of the cabin in the middle area, and performing compensation by taking the target temperature or the target humidity of the middle area as a reference to set the target temperature or the target humidity of other areas; and controlling the air valve opening degree of the air supply outlet of each area to enable the detected temperature of each area to be close to or equal to the target temperature. According to the invention, the cabin is partitioned, and air supply control is carried out on each region, so that the temperature control in the cabin is more accurate. And the temperature and humidity control efficiency of the unit is improved by correcting the temperature of the air outlet side of the condenser and the humidity of the air outlet side of the evaporator.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning temperature and humidity control, and in particular to a control method and an air-conditioning unit. Background Art

[0002] The air conditioning system for liquid cargo tanks of liquefied natural gas (LNG) ships is gradually emerging in the domestic market. The market generally adopts a combination of rotary dehumidifier + refrigerator. The principle is that the rotary system provides dehumidification capacity, the refrigeration system provides summer cooling capacity, and the electric heating provides winter heating capacity. However, how to effectively solve the problem of temperature and humidity uniformity of air conditioning in liquid cargo tanks has become a common problem faced by the industry. In response to this challenge, the heat pump dehumidification and air conditioning system for liquid cargo tanks of LNG ships developed must ensure that the air temperature in the cabin is maintained at 20-30°C and the relative humidity (RH) is lower than 70% during construction. More importantly, condensation must be avoided in the cabin to ensure the normal operation of the equipment.

[0003] The core goal of this system design is to meet the strict requirements of GTT (Gaztransport & Technigaz) for indoor environment under different climate environments. However, the existing heat pump dehumidification air conditioner for LNG cargo tanks has a low degree of automation in cooling and heating, and cannot achieve precise constant temperature and humidity regulation of the temperature and humidity in the cabin. Summary of the invention

[0004] In order to solve the technical problem of poor temperature and humidity control effect of heat pump dehumidification air conditioning for liquid cargo tanks in the above-mentioned prior art, the present invention provides a control method and an air conditioning unit.

[0005] The technical solution adopted by the present invention is:

[0006] The present invention proposes a control method for an air conditioning unit, wherein the air conditioning unit has a plurality of air outlets, the cabin is divided into a plurality of areas from top to bottom, and each area is connected to at least one of the air outlets, and the control method comprises the steps of:

[0007] If the temperature or humidity of the cabin does not meet the use requirements, adjust the target temperature or target humidity of the middle area of ​​the cabin, and use the target temperature or target humidity of the middle area as a reference for compensation to set the target temperature or target humidity of other areas;

[0008] The air valve opening of the air supply outlet of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature.

[0009] Furthermore, the target humidity or target temperature of the area above the middle area is obtained by subtracting the corresponding compensation value, and the target humidity or target temperature of the area below the middle area is obtained by adding the corresponding compensation value.

[0010] Furthermore, when the unit is in cooling mode, controlling the air valve opening of the air outlet of each area so that the temperature detected in each area is close to or equal to the target temperature specifically includes:

[0011] When the zone temperature is greater than the target temperature of the zone, and the temperature change within the preset time is less than the preset change, increase the air valve opening of the zone;

[0012] When the zone temperature is lower than the target temperature of the zone and the temperature change within a preset time period is smaller than the preset change, the air valve opening of the zone is reduced.

[0013] Specifically, when the air valve opening of any area increases to the maximum opening, the area temperature is still greater than the target temperature of the area, and the temperatures of other areas are greater than or equal to the target temperatures corresponding to other areas, the operating frequency of the compressor is increased to change the heat exchange capacity of the functional heat exchanger and reduce the outlet side temperature of the functional heat exchanger of the unit.

[0014] Furthermore, when the unit is in the heating mode, controlling the air valve opening of the air outlet of each area so that the temperature detected in each area is close to or equal to the target temperature specifically includes:

[0015] When the area temperature is greater than the target temperature of the area, and the temperature change within the preset time is less than the preset change, the air valve opening of the area is reduced;

[0016] When the zone temperature is lower than the target temperature of the zone and the temperature change within a preset time period is lower than the preset change, the air valve opening of the zone is increased.

[0017] Specifically, when the air valve opening of any area is increased to the maximum opening, the area temperature is still lower than the target temperature of the area, and the temperatures of other areas are lower than or equal to the target temperatures corresponding to other areas, the operating frequency of the compressor is increased to change the heat exchange capacity of the functional heat exchanger and increase the outlet air temperature of the functional heat exchanger of the unit.

[0018] Preferably, the air valve opening of the air supply outlet of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature; first, the target air supply volume corresponding to the target temperature of each area is obtained, and the air valve opening of each area is controlled so that the actual air supply volume of each area is equal to or close to the target air supply volume.

[0019] Furthermore, the temperature of the cabin does not meet the use requirements, and the target temperature of the cabin in the middle area is adjusted as follows:

[0020] If the temperature of any temperature measuring point in the cabin exceeds the preset temperature range, it is determined that the temperature of the cabin does not meet the use requirements;

[0021] When the temperature of any temperature measuring point in the cabin exceeds the maximum value of the preset temperature range, the target temperature in the middle area of ​​the cabin is lowered by a first preset temperature;

[0022] When the temperature of any temperature measuring point in the cabin exceeds the minimum value of the preset temperature range, the target temperature of the middle area of ​​the cabin is increased by a second preset temperature.

[0023] Further, after adjusting the target temperature of the middle area of ​​the cabin,

[0024] Determine whether the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature;

[0025] If yes, the unit keeps running in the current state;

[0026] If not, adjust the compressor frequency to change the heat exchange capacity of the functional heat exchanger until the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature or within the target temperature deviation range.

[0027] Furthermore, after adjusting the target humidity in the middle area of ​​the cabin,

[0028] Determine whether the humidity on the outlet side of the unit's heat recovery heat exchanger is equal to the target humidity;

[0029] If yes, the unit keeps running in the current state;

[0030] If not, adjust the refrigerant flow rate of the heat recovery heat exchanger to change the heat exchange amount until the humidity on the outlet side of the heat recovery heat exchanger of the unit is equal to the target humidity or within the target humidity deviation range. If the refrigerant flow rate of the heat recovery heat exchanger has been adjusted to the maximum preset flow rate, adjust the electric heating power of the rotary dehumidifier to make the humidity on the outlet side of the heat recovery heat exchanger of the unit equal to the target humidity or within the target humidity deviation range.

[0031] The present invention also proposes an air-conditioning unit, comprising: an air supply duct, and a rotary dehumidifier adsorption zone, a functional heat exchanger, and a heat recovery heat exchanger installed in the air supply duct and distributed in sequence along the air flow direction, wherein the functional heat exchanger and the heat recovery heat exchanger are both connected to a refrigerant circulation loop, and the above-mentioned control method is used to control the cabin temperature and humidity.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. Divide the cabin into zones and control the air supply to each zone to make the temperature control in the cabin more precise.

[0034] 2. By taking the middle area as the benchmark, adjusting the target temperature of other areas, and independently controlling the air supply of each area, the temperature and humidity control in the cabin is more targeted, the temperature and humidity control in each area is more reasonable, the temperature and humidity fluctuations in each area are reduced, and the stability of the temperature and humidity in the cabin is ensured.

[0035] 3. Improve the temperature and humidity control efficiency of the unit by correcting the temperature on the condenser outlet side and the humidity on the evaporator outlet side. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 is a flow chart of an embodiment of the present invention;

[0038] Figure 2 is a control flow chart of an embodiment of the present invention that does not meet the temperature and humidity requirements;

[0039] Figure 3 is a flow chart of target temperature control in an embodiment of the present invention;

[0040] Figure 4 is a cross-sectional schematic diagram of the air conditioning unit of the present invention;

[0041] Figure 5 It is a schematic diagram of the air processing flow of the air conditioning unit of the present invention;

[0042] Figure 6 is a cabin control schematic diagram of the marine air conditioning system of the present invention;

[0043] 1. Chassis; 2. Air supply channel; 21. Fresh air inlet; 22. Return air inlet; 3. Compressor; 4. Rotary dehumidifier; 5. Functional heat exchanger; 6. Heat recovery heat exchanger; 7. Air supply fan; 8. External unit heat exchange channel; 81. Condensation air outlet; 9. External unit heat exchange component; 10. Regeneration channel; 11 Regeneration fan; 12. Regeneration air outlet; 13. Fresh air filter; 14. Return air filter; 15. Electric heating device; 16. Air supply end; 17. Return air end; 18. Temperature and humidity sensor; 100. Air conditioning unit; 200. Cabin. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0046] The existing heat pump dehumidification air conditioner for LNG cargo tanks has a low degree of automation in cooling and heating, and cannot achieve accurate constant temperature and humidity regulation of the cabin. In addition, the overall area of ​​the cabin is too large, and adjusting the cabin as a whole is likely to cause excessive temperature regulation in the cabin, causing some areas in the cabin to exceed the appropriate temperature range, thus affecting the range requirements of the temperature and humidity in the cabin.

[0047] like Figure 1 As shown, in this regard, the present invention proposes a control method for an air-conditioning unit, which can be specifically a heat pump dehumidification air-conditioning unit, which is mainly used for cabin temperature and humidity control in a large area, and the cabin is divided into multiple areas from top to bottom, and the air supply end of the air-conditioning unit has multiple air supply ducts, that is, multiple air supply ports, and each area of ​​the cabin is connected to at least one air supply port. The control method specifically includes:

[0048] The preset time for the unit to start running;

[0049] If the temperature or humidity of the cabin does not meet the use requirements, that is, the temperature and humidity are out of range, adjust the target temperature or target humidity of the middle area of ​​the cabin, and use the target temperature or target humidity of the middle area as a benchmark to compensate and set the target temperature or target humidity of other areas; control the air valve opening of the air outlet of each area so that the temperature detected in each area is close to or equal to the target temperature;

[0050] If the temperature or humidity of the cabin meets the use requirements, that is, the humidity and temperature are within the corresponding range, then each area of ​​the cabin maintains the original target temperature and the unit is not adjusted.

[0051] That is, if the temperature and humidity in the cabin deviate from the preset temperature and humidity range, it means that the current target temperature or humidity may not be suitable for rapid temperature and humidity adjustment in each area, and the target temperature needs to be adjusted. Since the cold air is easy to sink, and the upper layer of the cabin is generally the illuminated area, while the lower layer is generally located underwater, the impact of the outside world on the inside is different. Therefore, the target temperature of other areas is adjusted based on the middle area, and the air supply control is performed on each area to make the temperature and humidity in the cabin more balanced to meet the corresponding temperature and humidity requirements, and at the same time, the temperature and humidity fluctuations are smaller.

[0052] By dividing the cabin into zones and controlling the air supply in each zone, the temperature control in the cabin can be made more accurate. By taking the middle zone as the benchmark, adjusting the target temperature of other zones, and independently controlling the air supply outlets in each zone, the temperature and humidity control in the cabin can be made more targeted, the temperature and humidity control in each zone can be made more reasonable, the temperature and humidity fluctuations in each zone can be reduced, and the temperature and humidity stability in the cabin can be ensured.

[0053] To avoid ambiguity, the above control is described in detail as follows: if the temperature of the cabin does not meet the use requirements, that is, the temperature is out of range, the target temperature of the cabin in the middle area is adjusted, and the target temperature of other areas is set based on the target temperature of the middle area; if the humidity of the cabin does not meet the use requirements, that is, the humidity is out of range, the target humidity of the cabin in the middle area is adjusted, and the target humidity of other areas is set based on the target humidity of the middle area;

[0054] The air valve opening of the air supply outlet of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature.

[0055] In a specific embodiment, when the unit is in cooling mode or heating mode, the target humidity of the area above the middle area is obtained by subtracting the corresponding compensation humidity, and the target humidity of the area below the middle area is obtained by adding the corresponding compensation humidity.

[0056] For example, if the target humidity in the middle area is 60%, the target humidity in the upper area can be reduced by 2% to compensate for the humidity, which is 58%; the target humidity in the lower area can be increased by 2% to compensate for the humidity, which is 62%.

[0057] Because when the unit is in cooling mode or heating mode, the humid air density is low and easy to rise, so humidity is easy to accumulate in the upper area, resulting in higher humidity in the upper area. By setting the target humidity in the upper area relatively low and the target humidity in the lower area relatively high, the humidity in the upper and lower areas can be kept away from the extreme values ​​of the humidity range to avoid humidity fluctuations.

[0058] In a specific embodiment,

[0059] When the unit is in cooling mode, the target temperature of the area above the middle area is obtained by subtracting the corresponding compensation value, and the target temperature of the area below the middle area is obtained by adding the corresponding compensation value;

[0060] When the unit is in heating mode, the target temperature of the area above the middle area is obtained by adding the corresponding compensation value, and the target temperature of the area below the middle area is obtained by subtracting the corresponding compensation value.

[0061] For example, the eight areas in the cabin are divided into three areas from top to bottom. The top three layers are the upper area with a target temperature of T1; the middle two layers are the middle area with a target temperature of T2; and the bottom three layers are the lower area with a target temperature of T3.

[0062] In cooling mode, the preset value of target temperature T1 is 22°C, the preset value of target temperature T2 is 25°C, and the preset value of target temperature T3 is 28°C. A decrease of 3°C is used as the compensation temperature, and different target temperatures in the cabin are used to control the cabin temperatures in the three areas to be close to 25°C.

[0063] Because the upper area is more difficult to cool down than other areas in cooling mode (due to external environmental influences such as light), it is more likely to reach the upper temperature limit. Its target temperature and humidity can be set lower than that of the middle area to increase the cooling capacity it supplies. In this way, when there is a large temperature fluctuation, the upper area can still be within the preset temperature range. In the lower area, due to the sinking of cooling capacity and the rise of humid air, the temperature of the lower area is more likely to reach the lower temperature limit, so its target temperature and humidity are set higher.

[0064] When the unit is in heating mode, the cabin needs to be heated up. The upper part is relatively easy to heat up, so its target temperature is set lower than that of the middle area to reduce the heat supply. The lower part is relatively difficult to heat up, so its target temperature is set higher than that of the middle area to increase the heat supply.

[0065] In a specific embodiment, when the unit is in cooling mode, controlling the air valve opening of the air outlet of each area so that the temperature detected in each area is close to or equal to the target temperature specifically includes:

[0066] When the temperature of a zone is greater than the target temperature of the zone, and the temperature change over a preset time period is less than a preset change, increase the air valve opening of the zone;

[0067] When the temperature of a zone is lower than the target temperature of the zone, and the temperature change within a preset time period is smaller than a preset change, the air valve opening of the zone is reduced.

[0068] That is, in cooling mode, if the area temperature is high and does not change much for a long time and is not obviously close to the target temperature, the air supply may be insufficient. It is necessary to increase the opening of the air valve in the area to increase the cooling supply. When the area temperature is lower than the target temperature of the area, it means that the cooling supply is too much. It is necessary to reduce the opening of the air valve to reduce the cooling supply so that the area temperature will automatically increase.

[0069] In a further embodiment, when the air valve opening of any area is increased to the maximum opening, the temperature of the area is still greater than the target temperature of the area, and the temperatures of other areas are greater than or equal to the target temperatures corresponding to other areas, that is, there is no area with excessive cold supply, the operating frequency of the compressor is increased to change the heat exchange capacity of the functional heat exchanger, thereby reducing the temperature on the air outlet side of the functional heat exchanger of the unit.

[0070] When the air valve opening of one or more areas is opened to the maximum, but the temperature cannot be reduced to the target temperature corresponding to the area, it means that the cooling supply on the unit side is insufficient. By increasing the operating frequency of the compressor and changing the heat exchange capacity of the functional heat exchanger, i.e., the evaporator, the temperature on the air outlet side of the functional heat exchanger of the unit can be reduced, the cooling capacity of the unit can be increased, and the areas with high temperatures can be brought close to their set target temperatures.

[0071] In a specific embodiment, when the unit is in the heating mode, controlling the air valve opening of the air outlet of each area so that the temperature detected in each area is close to or equal to the target temperature specifically includes:

[0072] When the temperature of a zone is greater than the target temperature of the zone, and the temperature change over a preset time period is less than a preset change, the air valve opening of the zone is reduced;

[0073] When the temperature of a zone is lower than the target temperature of the zone, and the temperature change within a preset time period is lower than a preset change, the air valve opening of the zone is increased.

[0074] In heating mode, since heat is supplied to each area in the cabin, the larger the opening of the air valve, the greater the heat supply and the higher the temperature rise rate, which is exactly the opposite of the cooling mode. Therefore, when the temperature of a zone is lower than the target temperature of the zone, the air valve needs to increase its opening. When the temperature of a zone is higher than the target temperature of the zone, the air valve needs to decrease its opening.

[0075] In a further embodiment, when the air valve opening of any area is increased to the maximum opening, the area temperature is still lower than the target temperature of the area, and the temperatures of other areas are lower than or equal to the target temperatures corresponding to other areas, the operating frequency of the compressor is increased to change the heating capacity of the functional heat exchanger, i.e., the condenser, and increase the air outlet side temperature of the functional heat exchanger, i.e., the condenser of the unit.

[0076] When the air valve opening of one or more areas is opened to the maximum, but the temperature cannot be raised to the corresponding target temperature of the area, it means that the heating supply on the unit side is insufficient. By increasing the operating frequency of the compressor to change the heating capacity of the functional heat exchanger, i.e. the condenser, the temperature of the air outlet side of the functional heat exchanger of the unit can be increased, and the heating capacity of the unit can be increased, so that each area with low temperature can be close to its set target temperature.

[0077] In a specific embodiment, the air valve opening of the air supply outlet of each area is controlled so that each area detects a temperature close to or equal to the target temperature; first, the target air supply volume corresponding to the target temperature of each area is obtained, and the air valve opening of each area is controlled so that the actual air supply volume of each area is equal to or close to the target air supply volume.

[0078] That is, air volume sensors are set in each area to detect the air volume of the air outlet, and the corresponding target air volume is preset for each target temperature. That is, the opening of the air valve can be quickly adjusted to the appropriate opening, which is faster than adjusting by temperature and reduces the number of times the air valve is adjusted.

[0079] For example, if the air supply volume in a certain area is less than the target air supply volume, the opening of the air supply valve in the relevant area will be increased according to the air valve adjustment step (5%); if it is detected that the air supply volume in a certain area is greater than the target air volume, the opening of the air supply valve in that area will be reduced; if the air supply volume is close to the target air volume, the target temperature condition will be used to adjust the air valve opening.

[0080] like Figure 2 , 3 As shown, in a specific embodiment, the temperature of the cabin does not meet the use requirements, and the target temperature of the cabin in the middle area is adjusted as follows:

[0081] If the temperature of any temperature measuring point in the cabin exceeds the preset temperature range, it is determined that the temperature of the cabin does not meet the use requirements;

[0082] When the temperature of any temperature measuring point in the cabin exceeds the maximum value of the preset temperature range, the target temperature in the middle area of ​​the cabin is lowered by a first preset temperature;

[0083] When the temperature of any temperature measuring point in the cabin exceeds the minimum value of the preset temperature range, the target temperature of the middle area of ​​the cabin is increased by a second preset temperature.

[0084] like Figure 3 As shown, the first preset temperature and the second preset temperature can both be 0.5°, and the preset temperature range is between 21° and 29°. The temperature in the cabin is kept below 27° and at a height of 22°, so that the temperature detected by the temperature sensor is within 20-30°.

[0085] The target humidity is adjusted in the same way as the target temperature, namely:

[0086] If the humidity at any humidity measuring point in the cabin exceeds the preset humidity range, it is determined that the humidity in the cabin does not meet the use requirements;

[0087] When the temperature of any humidity measuring point in the cabin exceeds the maximum value of the preset humidity range, the target humidity in the middle area of ​​the cabin is reduced by a first preset humidity;

[0088] When the temperature of any humidity measuring point in the cabin exceeds the minimum value of the preset humidity range, the target humidity in the middle area of ​​the cabin is increased by a second preset humidity.

[0089] If the temperature in the cabin exceeds the preset temperature and humidity range, in order to reduce damage to the equipment and storage in the cabin, the cooling or heating efficiency is changed by adjusting the target temperature so that the temperature in the cabin can be quickly restored to the preset temperature and humidity range.

[0090] In a specific embodiment, after adjusting the target temperature of the middle area of ​​the cabin,

[0091] Determine whether the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature;

[0092] If yes, keep the current unit running in the current state;

[0093] If not, adjust the compressor frequency to change the heat exchange capacity of the functional heat exchanger until the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature or within the target temperature deviation range.

[0094] The functional heat exchanger is an evaporator in cooling mode and a condenser in heating mode. The temperature of the air outlet side will directly affect the target temperature. First adjust it to a temperature close to the target temperature (within the target temperature deviation range, specifically the target temperature ±0.5°) or equal to the target temperature, so that the unit and the cooling and heating capacity can be quickly matched with the demand.

[0095] In a specific embodiment, in cooling mode, after adjusting the target humidity in the middle area of ​​the cabin,

[0096] Determine whether the humidity on the outlet side of the unit's heat recovery heat exchanger is equal to the target humidity;

[0097] If yes, keep the current unit running in the current state;

[0098] If not, adjust the refrigerant flow rate of the heat recovery heat exchanger to change the heat exchange amount until the humidity on the outlet side of the heat recovery heat exchanger of the unit is equal to the target humidity or within the target humidity deviation range. If the refrigerant flow rate of the heat recovery heat exchanger has been adjusted to the maximum flow rate, adjust the electric heating power of the rotary dehumidifier to make the humidity on the outlet side of the heat recovery heat exchanger of the unit equal to the target humidity or within the target humidity deviation range.

[0099] In cooling mode, the humidity on the outlet side of the heat recovery heat exchanger will directly affect the target temperature and has the highest priority. By preferentially adjusting the humidity on the outlet side of the heat recovery heat exchanger to be close to or equal to the target humidity, it can match the dehumidification demand in the cabin.

[0100] It should also be noted that in the heating mode, the functional heat exchanger is the condenser, and the humidity on its air outlet side has the highest priority. In order to avoid adjusting the compressor frequency affecting the supply air temperature, the electric heating power of the rotary dehumidifier is directly adjusted to make the humidity on the air outlet side of the functional heat exchanger of the unit, i.e. the condenser, equal to the target humidity or within the target humidity deviation range.

[0101] The present invention also proposes an air-conditioning unit, including an air supply duct, and a rotary dehumidifier adsorption zone, a functional heat exchanger, and a heat recovery heat exchanger installed in the air supply duct and distributed in sequence along the air flow direction. The functional heat exchanger and the heat recovery heat exchanger are both connected to a refrigerant circulation loop, and the above-mentioned control method is used to adjust the temperature and humidity in the cabin.

[0102] Multi-stage refrigeration dehumidification and condensation heat recovery heating are used to replace the conversion dehumidification of existing technology, and the temperature and humidity in the cabin are controlled in different areas to achieve precise constant temperature and humidity regulation of the cabin temperature and humidity.

[0103] like Figure 4 As shown, the air-conditioning unit 100 also includes: a plurality of temperature and humidity sensors 18 distributed in 8 small areas from top to bottom of the cabin 200 (the temperature and humidity of the upper area, the middle area, and the lower area are obtained by averaging the small areas), and the detection data of each temperature and humidity sensor 18 is received by the controller, and the air-conditioning unit 100 is controlled by the controller.

[0104] The cabin 200 is provided with an air supply port 16 and an air return port 17 connected to the air conditioning unit 100. The return air port 17 is located at the bottom of the cabin 200. Each small area is connected to a return air port, and the return air port is provided with a proportional air valve to control the opening size and can be controlled individually.

[0105] like Figure 5 , 6 As shown, the chassis 1 is divided into an air supply channel 2, in which the adsorption area of ​​the rotary dehumidifier 4 distributed in sequence along the air flow direction, at least two stages of functional heat exchangers 5, and a heat recovery heat exchanger 6 are installed. The air supply channel 2 is provided with a blower 7 for driving the air flow. The functional heat exchanger 5 and the heat recovery heat exchanger 6 are both connected to the refrigerant circulation loop, and the functional heat exchangers of each stage are arranged in parallel and can work independently to participate in the refrigerant circulation.

[0106] The refrigerant circulation loop includes a compressor 3, a throttling element, at least two-stage functional heat exchangers 5 arranged in parallel, and a heat recovery heat exchanger 6. The throttling element can be an electronic expansion valve. When the refrigerant circulation loop is in a refrigeration state, the functional heat exchanger 5 acts as an evaporator and the heat recovery heat exchanger 6 acts as a condenser. The refrigerant flow direction is that the high-temperature refrigerant discharged from the compressor 3 enters the heat recovery heat exchanger 6 for condensation and cooling, passes through the throttling element, is sent to the functional heat exchanger 5 for heat absorption and evaporation, and then returns to the compressor 3.

[0107] When the refrigerant circulation loop is in the cooling state, the functional heat exchangers 5 at all levels are turned on, and the air flow direction is that after the air flow passes through the functional heat exchangers 5 at all levels for step-by-step cooling and dehumidification, the temperature will be significantly lower than the use requirements, and the low-temperature air flow is then sent to the single-stage heat recovery heat exchanger 6 for condensation heat recovery and heating treatment, so that the temperature of the air flow sent into the room meets the use requirements, which can not only ensure comfort but also prevent condensation in the room.

[0108] Although the air supply channel 2 is installed with a rotary dehumidifier 4, the function of the rotary dehumidifier 4 is standby dehumidification, that is, the rotary dehumidifier 4 is usually turned on according to the above control requirements.

[0109] Based on the fact that the unit has the above-mentioned air supply channel 2, in some embodiments, the chassis 1 is also divided to form an external unit heat exchange channel 8, and the external unit heat exchange channel 8 is installed with an external unit heat exchange component 9, and the external unit heat exchange component 9 includes an external unit heat exchanger and an external fan for driving the airflow. The external unit heat exchanger is also connected to the refrigerant circulation loop, and the external unit heat exchanger is arranged in parallel with the heat recovery heat exchanger 6. The external unit heat exchanger and the heat recovery heat exchanger 6 can work independently to participate in the refrigerant circulation, and the refrigerant flow rate of the external unit heat exchanger and the heat recovery heat exchanger 6 can be adjusted by a valve to change the refrigerant circulation ratio, thereby changing the heat exchange amount of the heat recovery heat exchanger 6 to adjust the humidity.

[0110] Specifically, the refrigerant circulation loop includes a compressor 3, a throttling element, at least two-stage functional heat exchangers 5 arranged in parallel, and a heat recovery heat exchanger 6 and an outdoor heat exchange component 9 arranged in parallel. When the refrigerant circulation loop is in the heating state, the functional heat exchanger 5 is selectively turned on, and the heat recovery heat exchanger 6 is turned off. The turned-on functional heat exchanger 5 serves as a condenser and the outdoor heat exchange component 9 serves as an evaporator. The refrigerant flow direction is that the high-temperature refrigerant discharged from the compressor 3 enters the turned-on functional heat exchanger 5 for condensation and cooling, passes through the throttling element, is sent to the outdoor heat exchange component 9 for heat absorption and evaporation, and then returns to the compressor 3.

[0111] When the refrigerant circulation loop is in the heating state, the number of functional heat exchangers 5 to be opened is selected according to the heating demand, and the heat recovery heat exchanger 6 is closed. The air flow direction is that the air flow passes through the opened functional heat exchanger 5 for heating, and the hot air flow passes through the closed heat recovery heat exchanger 6 and is finally delivered to the room.

[0112] The present invention designs an outdoor heat exchange channel 8 and an outdoor heat exchange component 9. In the heating state, at least one functional heat exchanger 5 is turned on as a condenser and the outdoor heat exchange component 9 is turned on as an evaporator. The condenser is used to replace the electric heating device in the prior art to provide heat, making the air-conditioning unit more energy-saving and reliable.

[0113] It should be understood that a good heating effect can be achieved by turning on the first-stage functional heat exchanger 5 as a condenser. When the indoor heat demand is large or the outdoor ambient temperature is low, you can choose to turn on more than two stages of functional heat exchangers 5 as condensers to increase the heat supply.

[0114] In addition, in some embodiments, the air supply channel 2 is also equipped with an electric heating device 15, which heats the air flow passing through when turned on. The electric heating device 15 can be installed on the air outlet side of the heat recovery heat exchanger 6, and the present invention does not impose any special restrictions on this.

[0115] The function of the electric heating device 15 is standby heating, that is, the electric heating device 15 is usually not turned on. Under special working conditions, the electric heating device 15 is turned on for heating to ensure that the indoor temperature meets the use requirements. The special working conditions here can be designed according to actual conditions. For example, in the heating state, if the opening of the compressor 3 and the electronic expansion valve is adjusted to the most unfavorable condition, and the indoor temperature still cannot meet the use requirements, the electric heating device 15 is turned on for heating.

[0116] Based on the above-mentioned air supply channel 2 of the unit, in some embodiments, the chassis 1 is further divided to form a regeneration channel 10, in which regeneration heaters and the regeneration area of ​​the rotary dehumidifier 4 are installed in sequence along the airflow direction, and a regeneration fan 11 for driving the airflow is arranged in the regeneration channel 10. After the rotary dehumidifier 4 is turned on, the regeneration fan 11 drives the regeneration air to pass through the regeneration heater into the regeneration area of ​​the rotary dehumidifier 4, and then discharges the regeneration channel 10.

[0117] The regeneration channel 10 and the air supply channel 2 of the present invention are separated to avoid mutual interference of airflows and improve the air handling efficiency of the unit. In addition, in the embodiment in which the air supply channel 2, the external heat exchange channel 8 and the regeneration channel 10 are designed at the same time, the air supply channel 2, the external heat exchange channel 8 and the regeneration channel 10 are all separated. A fresh air filter 13 and a return air filter 14 are also installed in the air supply channel 2. The fresh air filter 13 is located on the air inlet side of the adsorption zone of the rotary dehumidifier 4, and the return air filter 14 is located on the air outlet side of the adsorption zone of the rotary dehumidifier 4. The air supply channel 2 is provided with a fresh air inlet 21, a return air inlet 22 and an air supply inlet. The functions of the fresh air inlet 21 and the return air inlet 22 are to introduce air flow into the air supply channel 2, and the function of the air supply inlet is to deliver the processed air flow in the air supply channel 2 to the indoor room. The fresh air inlet 21 is located on the air inlet side of the adsorption zone of the rotary dehumidifier 4, and the return air inlet 22 is located on the air outlet side of the adsorption zone of the rotary dehumidifier 4. The outdoor fresh air flows into the air supply channel from the air inlet side of the adsorption zone of the rotary dehumidifier 4, and the indoor return air flows into the air supply channel 2 from the air outlet side of the adsorption zone of the rotary dehumidifier 4.

[0118] For application scenarios such as ships or coastal areas, the fresh air filter 13 includes a primary filter, a desalination mist filter, and a chemical filter. The return air filter 14 includes a primary filter and a chemical filter. The primary filter is mainly responsible for filtering coarse particles and dust in the air to protect the components in the air supply channel from being blocked. The salt mist filter effectively blocks humid air containing salt from entering the components in the air supply channel to prevent salt mist from corroding and damaging the components. The chemical filter uses chemical filter materials and catalysts to effectively adsorb and decompose molecular-level pollutants (such as sulfides, nitrogen oxides, etc.) in the air, thereby removing harmful gases and purifying the air delivered to the room.

[0119] An application example of the present invention is used for explanation. The air supply channel 2, the external heat exchange channel 8 and the regeneration channel 10 all take in air from the side. The air inlet of the air supply channel 2 is the fresh air inlet 21 and the return air inlet 22. The air inlet of the external heat exchange channel 8 is the condensation air inlet 81. The air inlet of the regeneration channel 10 is the regeneration air inlet 12. Figure 1 It is a cross-sectional schematic diagram of the unit. The above-mentioned air outlet is located on the side not shown, so the fresh air outlet 21, the return air outlet 22, the condensation air outlet 81, and the regeneration air outlet 12 are represented by dotted lines. The order of components installed in the air supply channel 2 is the fresh air filter 13, the adsorption area of ​​the rotary dehumidifier 4, the return air filter 14, the two-stage functional heat exchanger 5, the single-stage heat recovery heat exchanger 6, the electric heating device 15, and the air supply fan 7. A water receiving pan is provided below the functional heat exchanger 5 and the heat recovery heat exchanger 6.

[0120] In this application example, the air treatment process of the air supply channel in the summer cooling state is as follows: outdoor fresh air enters the air supply channel 2 from the fresh air inlet 21, passes through the fresh air filter 13, passes through the rotary dehumidifier 4 and is mixed with the return air sent in from the return air inlet 22, the mixed air flow is cooled and dehumidified by the two-stage functional heat exchanger 5, and then passes through the single-stage heat recovery heat exchanger 6 to absorb heat and heat up, the treated air passes through the electric heating device 15, and is sent into the cabin by the air supply fan 7.

[0121] In this application example, the air treatment process of the air supply channel in the winter heating state is as follows: outdoor fresh air enters the air supply channel from the fresh air inlet 21, passes through the fresh air filter 13, passes through the rotary dehumidifier 4 and mixes with the return air sent in from the return air inlet, the mixed air flow passes through the primary functional heat exchanger 5 to absorb heat and heat up, the treated air passes through the heat recovery heat exchanger 6 and the electric heating device 15, and is sent into the cabin through the air supply fan 7.

[0122] In order to improve the control accuracy of the unit, in some embodiments, temperature and humidity sensors are installed on the air outlet side of the functional heat exchanger 5 and the air outlet side of the heat recovery heat exchanger 6. The advantage of this design is that the temperature and humidity sensors on the air outlet side of each stage of the heat exchanger can provide real-time feedback on the air processing situation, and the data fed back by the temperature and humidity sensors can realize multi-stage segmented control and achieve precise control of temperature and humidity.

[0123] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0124] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0125] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0126] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0127] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for an air conditioning unit, characterized in that: The air conditioning unit has a plurality of air outlets, the cabin is divided into a plurality of areas from top to bottom, and each area is connected to at least one of the air outlets, and the control method comprises the steps of: If the temperature or humidity of the cabin does not meet the use requirements, adjust the target temperature or target humidity of the middle area of ​​the cabin, and use the target temperature or target humidity of the middle area as a reference for compensation to set the target temperature or target humidity of other areas; The air valve opening of the air supply outlet of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature.

2. The control method of the air conditioning unit according to claim 1, characterized in that: The target humidity or target temperature of the area above the middle area is obtained by subtracting the corresponding compensation value, and the target humidity or target temperature of the area below the middle area is obtained by adding the corresponding compensation value.

3. The control method of the air conditioning unit according to claim 1, characterized in that: When the unit is in cooling mode, the air valve opening of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature. Specifically, it includes: When the zone temperature is greater than the target temperature of the zone, and the temperature change within the preset time is less than the preset change, increase the air valve opening of the zone; When the zone temperature is lower than the target temperature of the zone and the temperature change within a preset time period is smaller than the preset change, the air valve opening of the zone is reduced.

4. The control method of the air conditioning unit according to claim 3, characterized in that: When the air valve opening of any area increases to the maximum opening, the area temperature is still greater than the target temperature of the area, and the temperatures of other areas are greater than or equal to the corresponding target temperatures of other areas, the operating frequency of the compressor is increased to change the heat exchange of the functional heat exchanger and reduce the outlet temperature of the functional heat exchanger of the unit.

5. The control method of the air conditioning unit according to claim 1, characterized in that: When the unit is in heating mode, the air valve opening of each area is controlled so that the temperature detected in each area is close to or equal to the target temperature. Specifically, it includes: When the area temperature is greater than the target temperature of the area, and the temperature change within the preset time is less than the preset change, the air valve opening of the area is reduced; When the zone temperature is lower than the target temperature of the zone and the temperature change within a preset time period is lower than the preset change, the air valve opening of the zone is increased.

6. The control method of the air conditioning unit according to claim 5, characterized in that: When the air valve opening of any area increases to the maximum opening, and the area temperature is still lower than the target temperature of the area, and the temperatures of other areas are lower than or equal to the corresponding target temperatures of other areas, the operating frequency of the compressor is increased to change the heat exchange of the functional heat exchanger and increase the outlet temperature of the functional heat exchanger of the unit.

7. The control method of the air conditioning unit according to claim 1, characterized in that: Control the air valve opening of the air supply outlet of each area so that the temperature detected in each area is close to or equal to the target temperature; first obtain the target air supply volume corresponding to the target temperature of each area, and control the air valve opening of each area so that the actual air supply volume of each area is equal to or close to the target air supply volume.

8. The control method of the air conditioning unit according to claim 1, characterized in that: The temperature of the cabin does not meet the use requirements, and the target temperature of the cabin in the middle area is adjusted as follows: If the temperature of any temperature measuring point in the cabin exceeds the preset temperature range, it is determined that the temperature of the cabin does not meet the use requirements; When the temperature of any temperature measuring point in the cabin is higher than the maximum value of the preset temperature range, the target temperature in the middle area of ​​the cabin is lowered by a first preset temperature; When the temperature at any temperature measuring point in the cabin is lower than the minimum value of the preset temperature range, the target temperature in the middle area of ​​the cabin is increased by a second preset temperature.

9. The control method of the air conditioning unit according to claim 1, characterized in that: After adjusting the target temperature in the middle area of ​​the cabin, Determine whether the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature; If yes, the unit keeps running in the current state; If not, adjust the compressor frequency to change the heat exchange capacity of the functional heat exchanger until the outlet temperature of the functional heat exchanger of the unit is equal to the target temperature or within the target temperature deviation range.

10. The control method of the air conditioning unit according to claim 3, characterized in that: After adjusting the target humidity in the middle area of ​​the cabin, Determine whether the humidity on the outlet side of the unit's heat recovery heat exchanger is equal to the target humidity; If yes, the unit keeps running in the current state; If not, adjust the refrigerant flow rate of the heat recovery heat exchanger to change the heat exchange amount until the humidity on the outlet side of the heat recovery heat exchanger of the unit is equal to the target humidity or within the target humidity deviation range. If the refrigerant flow rate of the heat recovery heat exchanger has been adjusted to the maximum preset flow rate, adjust the electric heating power of the rotary dehumidifier to make the humidity on the outlet side of the heat recovery heat exchanger of the unit equal to the target humidity or within the target humidity deviation range.

11. An air conditioning unit, characterized in that: It includes: an air supply channel, and a rotary dehumidifier adsorption zone, a functional heat exchanger, and a heat recovery heat exchanger installed in the air supply channel and distributed in sequence along the air flow direction. The functional heat exchanger and the heat recovery heat exchanger are both connected to a refrigerant circulation loop, and the temperature and humidity of the cabin are controlled using the control method described in any one of claims 1 to 10.

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