CN110529922B - Single-cooling type temperature and humidity control multi-split air conditioning system and control method thereof - Google Patents
Single-cooling type temperature and humidity control multi-split air conditioning system and control method thereof Download PDFInfo
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- CN110529922B CN110529922B CN201910809525.2A CN201910809525A CN110529922B CN 110529922 B CN110529922 B CN 110529922B CN 201910809525 A CN201910809525 A CN 201910809525A CN 110529922 B CN110529922 B CN 110529922B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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Abstract
The invention relates to a single-cooling temperature and humidity control multi-split air conditioning system and a control method thereof, wherein the system comprises an outdoor unit and at least two indoor units, the outdoor unit comprises an outdoor heat exchanger, a compressor and a refrigeration accessory, each indoor unit comprises a fan and an indoor heat exchanger, each indoor unit comprises two indoor heat exchangers, a bypass valve set is arranged on each second heat exchanger, and the first heat exchanger is connected with the outdoor unit after being connected with the second heat exchanger so as to switch the work of the single heat exchanger or the work of the double heat exchangers as required; a high-pressure gas storage tank is arranged between the exhaust port of the compressor and the outdoor heat exchanger, and a second outlet of the high-pressure gas storage tank is connected with the front end of the first heat exchanger of each indoor unit; the indoor unit is provided with a temperature sensor, an air outlet humidity sensor and an air return humidity sensor, and the system is also provided with a control module which is respectively and electrically connected with each sensor and each valve. The system and the control method thereof are beneficial to treating the condensed water at the air outlet and the indoor unit, so that the air outlet and the indoor unit are kept dry.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a single-cooling type temperature and humidity control multi-split air conditioning system and a control method thereof.
Background
With the development of society, air conditioners have become essential living necessities for families. The multi-split air conditioning system refers to an air conditioner in which one outdoor unit is connected to two or more indoor units through a pipe. The multi-split air conditioner has the advantages of energy conservation, low maintenance cost, simplicity and flexibility in installation and the like, so that the multi-split air conditioner occupies a large market rate. Especially in hot summer and warm winter areas, the single-cooling multi-connected air conditioner is more and more emphasized.
However, with the use of the single-cooling multi-split air conditioner, some problems arise, which are particularly shown in the following: 1) the ceiling is condensed and even yellowed, which affects the beauty. When the multi-split air conditioner is in a stop state, the humidity of indoor air exceeds the standard, air blown out from the air outlets at four sides at high rotating speed can cause the air outlets to be condensed when the multi-split air conditioner runs intermittently, and the appearance is that the air outlets are hung by water drops, and a suspended ceiling even turns yellow. 2) The indoor unit is easily mildewed. Due to the limitation of the structure of the heat exchanger of the indoor unit, when the multi-split air conditioner is in a non-use state, condensed water is attached to the surface of the heat exchanger of the indoor unit, and a long time is needed for evaporation. In the process, dust, viruses, bacteria and the like are easy to accumulate in a humid environment, so that the indoor unit is easy to mildew, and the indoor air quality is seriously influenced.
At present, the main methods for solving the problem are as follows: in patent 02225003.4, a humidity sensor is installed on the indoor unit, and the indoor unit is dried by adjusting the angle of the fan and the air guide strip. Patent 201610206797.X proposes to use a blowing drying program, to use a drying mode of heating operation, and to simultaneously execute blowing and heating operation programs to dry an indoor unit. These methods can only dry the condensed water generated by the indoor unit body, do not relate to how to treat the condensed water at the air outlet and the ceiling, and do not consider how to reduce the condensed water of the indoor unit, and the effect is not obvious particularly for the single-cooling multi-split air conditioner in the areas with summer heat and winter heat.
Disclosure of Invention
The invention aims to provide a single-cooling type temperature and humidity control multi-split air conditioning system and a control method thereof, which are beneficial to treating condensed water at an indoor unit and an air outlet and keeping the indoor unit and the air outlet dry.
In order to achieve the purpose, the invention adopts the technical scheme that: a single-cooling temperature and humidity control multi-split air conditioning system comprises an outdoor unit and at least two indoor units connected with the outdoor unit through a pipe, wherein the outdoor unit mainly comprises an outdoor heat exchanger, a compressor and a refrigeration accessory, the indoor units mainly comprise a fan and an indoor heat exchanger, the indoor units are provided with two indoor heat exchangers, namely a first heat exchanger and a second heat exchanger, a bypass valve group is arranged on the second heat exchanger, and the first heat exchanger is connected with the outdoor unit after being connected with the second heat exchanger provided with the bypass valve group so as to switch the first heat exchanger to work independently or the first heat exchanger and the second heat exchanger to work together as required; a high-pressure gas storage tank is arranged between the exhaust port of the compressor and the outdoor heat exchanger, and a second outlet of the high-pressure gas storage tank is connected with the front end of the first heat exchanger of each indoor unit through a drying pipeline, a drying branch and a corresponding valve; the indoor unit is provided with a temperature sensor, an air outlet humidity sensor and an air return humidity sensor, the system is further provided with a control module, the temperature sensor, the air outlet humidity sensor and the air return humidity sensor are respectively electrically connected with the input end of the control module, and the output end of the control module is respectively electrically connected with each valve so as to control each valve to work.
Furthermore, the bypass valve group comprises an upstream valve, a downstream valve and a bypass valve arranged on a bypass pipeline, the upstream valve and the downstream valve are respectively arranged on an upstream pipeline and a downstream pipeline of the second heat exchanger, an outlet of the first heat exchanger is divided into two paths, one path is connected with the front end of the upstream pipeline of the second heat exchanger, the other path is connected with the front end of the bypass pipeline, and the rear end of the downstream pipeline of the second heat exchanger is connected with the rear end of the bypass pipeline and then is connected with the outdoor unit.
Furthermore, the first heat exchanger is connected with a gas-liquid separator of an outdoor unit after being connected with a second heat exchanger provided with a bypass valve group, an outlet pipeline of the gas-liquid separator is connected with an air inlet of a compressor, an air outlet of the compressor is connected with a high-pressure air storage tank through an oil separator, a first outlet of the high-pressure air storage tank is connected with the outdoor heat exchanger, an outlet pipeline of the outdoor heat exchanger is connected with a liquid storage device through an electronic expansion valve, outlet pipelines of the liquid storage device are respectively connected with refrigerant pipelines in front of indoor units, a filter is arranged on each refrigerant pipeline, and the rear section of each refrigerant pipeline is connected with the front end of the corresponding first heat exchanger through a throttle valve and.
Further, the throttling valve comprises a first throttling valve and a second throttling valve, the switching valve comprises a first switching valve and a second switching valve, the rear section of the refrigerant pipeline is divided into a first refrigerant branch and a second refrigerant branch which are connected with the front end of the first heat exchanger, the first throttling valve and the first switching valve are arranged on the first refrigerant branch, and the second throttling valve and the second switching valve are arranged on the second refrigerant branch to open the corresponding throttling valve and the corresponding switching valve according to dry and wet working conditions.
Furthermore, the temperature sensor and the air outlet humidity sensor are arranged at an air outlet of the indoor unit, and the return air humidity sensor is arranged at an air return inlet of the indoor unit.
The invention also provides a control method of the single-cooling type temperature and humidity control multi-split air conditioning system, which comprises the following steps:
step 1) setting a wet condition single heat exchanger refrigeration dehumidification mode, a wet condition double heat exchanger refrigeration dehumidification mode, a dry condition single heat exchanger refrigeration mode, a dry condition double heat exchanger refrigeration mode, a drying mode and an indoor air humidity threshold phi0Indoor air temperature threshold t0；
Step 2) the temperature sensor and the air outlet humidity sensor measure the indoor temperature t and the indoor humidity phi in real time, and when the phi is larger than the phi0Then step 3 is entered, when phi is less than or equal to phi0Then entering step 4;
step 3) when the indoor temperature t is less than or equal to t0When the indoor temperature t is higher than t, the indoor temperature enters a single heat exchanger refrigeration and dehumidification mode under the wet working condition0When the humidity reaches the second preset value, entering a wet working condition double-heat-exchanger refrigeration dehumidification mode;
step 4) when the indoor temperature t is less than or equal to t0When the indoor temperature t is higher than t, the single heat exchanger refrigeration mode under dry condition is started0When the pressure is higher than the preset pressure, entering a dry working condition double-heat-exchanger refrigeration mode;
and 5) when the outdoor unit is shut down after the refrigeration work is finished, entering a drying mode, opening a relevant valve between a high-pressure air storage tank and the first heat exchanger, an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger by a control module, closing a switch valve on a refrigerant pipeline in front of the indoor unit and a bypass valve on a bypass pipeline of the second heat exchanger, sequentially entering the first heat exchanger and the second heat exchanger by high-temperature and high-pressure refrigerant steam in the high-pressure air storage tank, drying the first heat exchanger and the second heat exchanger under the action of an indoor fan, simultaneously heating an air outlet and surrounding structures by air blown out from an air outlet of the indoor unit, finishing the drying work when the deviation between the humidity of return air and the humidity of outlet air is smaller than a set value, shutting down.
Further, the working method of the single heat exchanger refrigeration dehumidification mode under the wet working condition comprises the following steps: the control module opens a bypass valve on a bypass pipeline of the second heat exchanger, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, and closes a first switch valve on a first refrigerant branch pipeline in front of the indoor unit0If so, entering the step 4; the process is a wet cooling process, the first heat exchanger and the air outlet of the indoor unit are cooled in a wet mode, and condensation water can occur.
Further, the working method of the wet condition double heat exchanger refrigeration dehumidification mode is as follows: the control module opens upstream and downstream valves on upstream and downstream pipelines of the second heat exchanger and a second switch valve on a second refrigerant branch in front of the indoor unit, closes related valves between the high-pressure gas storage tank and the first heat exchanger and closes a bypass pipeline of the second heat exchangerThe control module uses the temperature after throttling as the dew point temperature to subtract a second set value to adjust the opening of a second throttle valve, the high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger and the second heat exchanger in sequence after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates in the same way until the indoor temperature t is less than or equal to t0When the humidity reaches the standard value, + a, entering a single heat exchanger refrigeration and dehumidification mode under a wet working condition; the process is a wet cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are cooled in a wet mode, and condensation water can occur.
Further, the working method of the dry-condition single heat exchanger refrigeration mode comprises the following steps: the control module opens a bypass valve on a bypass pipeline of the second heat exchanger, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, and closes a second switch valve on a second refrigerant branch pipeline in front of the indoor unit, refrigerant in the outdoor unit enters a liquid storage device through the compressor, the high-pressure gas storage tank and the outdoor heat exchanger by opening the first heat exchanger, the control module adjusts the opening of a first throttle valve by taking the temperature after throttling as dew point temperature and adding a first set value, high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger at the temperature slightly higher than the dew point temperature after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates until the refrigeration work is finished; the process is a dry cooling process, the first heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and condensation water cannot occur.
Further, the working method of the dry-condition double-heat-exchanger refrigeration mode comprises the following steps: the control module opens upstream and downstream valves on upstream and downstream pipelines of the second heat exchanger, a first switch valve on a first refrigerant branch in front of the indoor unit, closes related valves between the high-pressure gas storage tank and the first heat exchanger, closes a bypass valve on a bypass pipeline of the second heat exchanger, and opens a bypass valve on a bypass pipeline of the indoor unit in front of the indoor unitThe second switch valve on the second refrigerant branch is used for enabling refrigerant in the outdoor unit to enter the liquid storage device through the compressor, the high-pressure air storage tank and the outdoor heat exchanger by opening the first heat exchanger and the second heat exchanger, the control module adjusts the opening degree of the first throttle valve by taking the temperature after throttling as the dew point temperature and adding a first set value, high-pressure refrigerant liquid from the liquid storage device sequentially enters the first heat exchanger and the second heat exchanger through filtering and throttling and the temperature slightly higher than the dew point temperature, returns to the compressor after phase change heat exchange, and circulates until the indoor temperature t is less than or equal to t0When the pressure is higher than the preset pressure, entering a dry working condition single heat exchanger refrigeration mode; the process is a dry cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and condensation water cannot occur.
Compared with the prior art, the invention has the following beneficial effects: the system performs temperature and humidity control on the indoor unit and the air outlet in the refrigeration process, reduces condensed water as much as possible, performs drying treatment on the condensed water when the normal operation of other indoor units of the system is not influenced, keeps the indoor unit and the air outlet dry, prevents the indoor unit from going mouldy and prevents the ceiling from generating condensed water, turning yellow and the like, and has strong practicability and wide application prospect.
Drawings
Fig. 1 is a schematic diagram of a system architecture of an embodiment of the present invention.
Fig. 2 is a system control schematic diagram of an embodiment of the invention.
Fig. 3 is a flowchart of a control method according to an embodiment of the present invention.
In the figure, 1-a first heat exchanger, 2-a second heat exchanger, 3-a filter, 4-a high-pressure air storage tank, 5-a drying pipeline, 6-a valve on a drying branch, 7-a temperature sensor, 8-an air outlet humidity sensor, 9-a control module, 10-a bypass valve, 11-an upstream valve, 12-a downstream valve, 13-a first switch valve, 14-a second switch valve, 15-a throttle valve, 16-a valve on the drying pipeline and 17-a return air humidity sensor.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a single-cooling temperature and humidity control multi-split air conditioning system, which comprises an outdoor unit and at least two indoor units connected with the outdoor unit through a pipe, wherein the outdoor side adopts air cooling heat exchange, the indoor side adopts direct evaporation heat exchange, the outdoor unit mainly comprises an outdoor heat exchanger, a compressor and a refrigeration accessory, and the indoor unit mainly comprises a fan and an indoor heat exchanger (evaporator), and is characterized in that the indoor unit is provided with two indoor heat exchangers, namely a first heat exchanger 1 and a second heat exchanger 2, the second heat exchanger 2 is provided with a bypass valve group, and the first heat exchanger 1 is connected with the outdoor unit after being connected with the second heat exchanger 2 provided with the bypass valve group so as to switch the first heat exchanger 1 to work alone or the first heat exchanger 1 and the second heat exchanger 2 to work together according to needs; and a high-pressure gas storage tank 4 is arranged between the exhaust port of the compressor and the outdoor heat exchanger, and a second outlet of the high-pressure gas storage tank 4 is connected with the front end of the first heat exchanger of each indoor unit through a drying pipeline 5, a drying branch and corresponding valves 16 and 6.
The bypass valve group comprises an upstream valve 11, a downstream valve 12 and a bypass valve 10 arranged on a bypass pipeline, the upstream valve and the downstream valve are respectively arranged on an upstream pipeline and a downstream pipeline of the second heat exchanger, an outlet of the first heat exchanger is divided into two paths, one path is connected with the front end of the upstream pipeline of the second heat exchanger, the other path is connected with the front end of the bypass pipeline, and the rear end of the downstream pipeline of the second heat exchanger is connected with the rear end of the bypass pipeline and then is connected with the outdoor unit.
The air conditioner comprises a first heat exchanger 1, a second heat exchanger 2, a high-pressure air storage tank, an outdoor heat exchanger, an electronic expansion valve, a liquid storage device, a filter 3 and a switch valve, wherein the first heat exchanger is connected with the gas-liquid separator of an outdoor unit after being connected with the second heat exchanger 2 provided with a bypass valve group, an outlet pipeline of the gas-liquid separator is connected with an air inlet of a compressor, an air outlet of the compressor is connected with the high-pressure air storage tank through the oil separator, a first outlet of the high-pressure air storage tank is connected with the outdoor heat exchanger, an outlet pipeline of the outdoor heat exchanger is connected with the liquid storage device through the electronic expansion valve, the outlet pipeline of the liquid storage device is respectively connected with refrigerant pipelines in front of indoor units, the refrigerant pipeline is provided with.
In this embodiment, the throttle valve includes a first throttle valve and a second throttle valve, the switch valve includes a first switch valve and a second switch valve, the refrigerant pipeline back end is divided into a first refrigerant branch and a second refrigerant branch, and both are connected with the front end of the first heat exchanger, the first throttle valve and the first switch valve are arranged on the first refrigerant branch, and the second throttle valve and the second switch valve are arranged on the second refrigerant branch to open the corresponding throttle valve and switch valve according to the dry and wet conditions.
In order to realize the automatic control of the system, as shown in fig. 2, a temperature sensor 7, an air outlet humidity sensor 8 and an air return humidity sensor 17 are arranged on the indoor unit, the temperature sensor 7 and the air outlet humidity sensor 8 are arranged at an air outlet of the indoor unit, the air return humidity sensor 17 is arranged at an air inlet of the indoor unit, the system is further provided with a control module 9, the temperature sensor 7, the air outlet humidity sensor 8 and the air return humidity sensor 17 are respectively and electrically connected with an input end of the control module 9, an output end of the control module 9 is respectively and electrically connected with each valve, and the control module comprises an upstream valve 11, a downstream valve 12, a bypass valve 10, a first switch valve 13, a second switch valve 14, a valve 16 on a drying pipeline between the high-pressure gas storage tank and the first heat exchanger and a valve 6 on a.
The invention also provides a control method of the single-cooling type temperature and humidity control multi-split air conditioning system, which comprises the following steps as shown in fig. 3:
step 1) setting a wet condition single heat exchanger refrigeration dehumidification mode, a wet condition double heat exchanger refrigeration dehumidification mode, a dry condition single heat exchanger refrigeration mode, a dry condition double heat exchanger refrigeration mode, a drying mode and an indoor air humidity threshold phi0Indoor air temperature threshold t0。
Step 2) the temperature sensor 7 and the air outlet humidity sensor 8 measure the indoor temperature t and the indoor humidity phi in real time, and when the phi is larger than the phi0Then step 3 is entered, when phi is less than or equal to phi0Step 4 is entered.
Step 3) when the indoor temperature t is less than or equal to t0When the temperature is + a (in the embodiment, a is 5 ℃), the single heat exchanger refrigeration and dehumidification mode under the wet condition is entered, and when the indoor temperature t is more than t0And when the humidity reaches + a, the system enters a wet working condition double-heat-exchanger refrigeration and dehumidification mode.
The working method of the wet working condition single heat exchanger refrigeration dehumidification mode comprises the following steps: the control module 9 opens a bypass valve 10 on a bypass pipeline of the second heat exchanger, closes related valves 16 and 6 between the high-pressure gas storage tank and the first heat exchanger, opens upstream and downstream valves 11 and 12 on upstream and downstream pipelines of the second heat exchanger, and closes a first switch valve 13 on a first refrigerant branch in front of the indoor unit, refrigerant in the outdoor unit enters a liquid storage device through a compressor, the high-pressure gas storage tank and the outdoor heat exchanger by opening the first heat exchanger, the control module adjusts the opening degree of a second throttle valve by subtracting a second set value of 8 ℃ from the throttled temperature, high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates in such a way until the indoor humidity phi is less than or equal to phi0If so, entering the step 4; the process is a wet cooling process, the first heat exchanger and the air outlet of the indoor unit are cooled in a wet mode, and condensation water can occur.
The working method of the wet working condition double heat exchanger refrigeration dehumidification mode comprises the following steps: the control module 9 opens the upstream and downstream valves 11, 12 on the upstream and downstream pipelines of the second heat exchanger, and the second switch valve 14 on the second refrigerant branch in front of the indoor unit, closes the related valves 16, 6 between the high-pressure gas storage tank and the first heat exchanger, the bypass valve 10 on the bypass pipeline of the second heat exchanger, and the first switch valve 13 on the first refrigerant branch in front of the indoor unit, by opening the first heat exchanger and the second heat exchanger, the refrigerant in the outdoor unit enters the liquid storage device through the compressor, the high-pressure gas storage tank and the outdoor heat exchanger, the control module adjusts the opening degree of the second throttle valve by subtracting a second set value of 8 ℃ from the temperature after throttling, and the high-pressure brake from the liquid storage deviceFiltering and throttling the refrigerant liquid, sequentially entering a first heat exchanger and a second heat exchanger, performing phase change heat exchange, returning to the compressor, and circulating until the indoor temperature t is less than or equal to t0When the humidity reaches the standard value, + a, entering a single heat exchanger refrigeration and dehumidification mode under a wet working condition; the process is a wet cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are cooled in a wet mode, and condensation water can occur.
Step 4) when the indoor temperature t is less than or equal to t0When the indoor temperature t is higher than t, the single heat exchanger refrigeration mode under dry condition is started0And when the pressure reaches + a, entering a dry working condition double-heat exchanger refrigeration mode.
The working method of the dry working condition single heat exchanger refrigeration mode comprises the following steps: the control module 9 opens a bypass valve 10 on a bypass pipeline of the second heat exchanger, and a first switch valve 13 on a first refrigerant branch in front of the indoor unit, closes related valves 16 and 6 between the high-pressure gas storage tank and the first heat exchanger, upstream and downstream valves 11 and 12 on upstream and downstream pipelines of the second heat exchanger, and a second switch valve 14 on a second refrigerant branch in front of the indoor unit, by opening the first heat exchanger, refrigerant in the outdoor unit enters the liquid storage device through the compressor, the high-pressure air storage tank and the outdoor heat exchanger, the control module adjusts the opening degree of the first throttle valve by taking the temperature after throttling as dew point temperature and adding a first set value of 1 ℃, high-pressure refrigerant liquid from the liquid storage device is filtered and throttled, the refrigerant enters the first heat exchanger at a temperature slightly higher than the dew point temperature, returns to the compressor after phase change heat exchange, and circulates in the way until the refrigeration work is finished; the process is a dry cooling process, the first heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and condensation water cannot occur.
The working method of the dry working condition double heat exchanger refrigeration mode comprises the following steps: the control module 9 opens the upstream and downstream valves 11, 12 on the upstream and downstream pipelines of the second heat exchanger, and a first switch valve 13 on the first refrigerant branch in front of the indoor unit, closes the related valves 16, 6 between the high-pressure gas storage tank and the first heat exchanger, a bypass valve 10 on the bypass pipeline of the second heat exchanger, and a second switch valve 14 on the second refrigerant branch in front of the indoor unit, and opens the first heat exchanger and the second heat exchanger to realize the control of the outdoor unitRefrigerant enters a liquid storage device through a compressor, a high-pressure gas storage tank and an outdoor heat exchanger, a control module adjusts the opening degree of a first throttle valve by taking the temperature after throttling as dew point temperature and adding a first set value of 1 ℃, high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger and a second heat exchanger in sequence at the temperature slightly higher than the dew point temperature after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates until the indoor temperature t is less than or equal to t0When the pressure is higher than the preset pressure, entering a dry working condition single heat exchanger refrigeration mode; the process is a dry cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and condensation water cannot occur.
And 5) when the outdoor unit is shut down after the refrigeration work is finished, the outdoor unit enters a drying mode, a control module 9 opens related valves 16 and 6 between a high-pressure air storage tank and a first heat exchanger, upstream and downstream valves 11 and 12 on upstream and downstream pipelines of a second heat exchanger, closes switch valves 13 and 14 on a refrigerant pipeline in front of an indoor unit and a bypass valve 10 on a bypass pipeline of the second heat exchanger, high-temperature and high-pressure refrigerant steam in the high-pressure air storage tank sequentially enters the indoor first heat exchanger and the indoor second heat exchanger, the first heat exchanger and the second heat exchanger are dried under the action of an indoor fan, meanwhile, air blown out from an air outlet of the indoor unit heats up the air outlet and surrounding structures, when the deviation between the humidity of return air and the humidity of outlet air is less than 5%, the drying work is finished, the indoor unit is shut down.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (5)
1. A single-cooling temperature and humidity control multi-split air conditioning system comprises an outdoor unit and at least two indoor units connected with the outdoor unit through a pipe, wherein the outdoor unit mainly comprises an outdoor heat exchanger, a compressor and a refrigeration accessory, and the indoor units mainly comprise a fan and an indoor heat exchanger; a high-pressure gas storage tank is arranged between the exhaust port of the compressor and the outdoor heat exchanger, and a second outlet of the high-pressure gas storage tank is connected with the front end of the first heat exchanger of each indoor unit through a drying pipeline, a drying branch and a corresponding valve; the system is characterized in that a temperature sensor, an air outlet humidity sensor and an air return humidity sensor are arranged on the indoor unit, the system is also provided with a control module, the temperature sensor, the air outlet humidity sensor and the air return humidity sensor are respectively and electrically connected with the input end of the control module, and the output end of the control module is respectively and electrically connected with each valve so as to control each valve to work;
the control method of the single-cooling type temperature and humidity control multi-split air conditioning system comprises the following steps:
step 1) setting a wet condition single heat exchanger refrigeration dehumidification mode, a wet condition double heat exchanger refrigeration dehumidification mode, a dry condition single heat exchanger refrigeration mode, a dry condition double heat exchanger refrigeration mode, a drying mode and an indoor air humidity threshold phi0Indoor air temperature threshold t0；
Step 2) the temperature sensor and the air outlet humidity sensor measure the indoor temperature t and the indoor humidity phi in real time, and when the phi is larger than the phi0Then step 3 is entered, when phi is less than or equal to phi0Then entering step 4;
step 3) when the indoor temperature t is less than or equal to t0When the indoor temperature t is higher than t, the indoor temperature enters a single heat exchanger refrigeration and dehumidification mode under the wet working condition0When the humidity reaches the second preset value, entering a wet working condition double-heat-exchanger refrigeration dehumidification mode;
step 4) when the indoor temperature t is less than or equal to t0When the indoor temperature t is higher than t, the single heat exchanger refrigeration mode under dry condition is started0When the pressure is higher than the preset pressure, entering a dry working condition double-heat-exchanger refrigeration mode;
step 5) when the outdoor unit is shut down after the refrigeration work is finished, a drying mode is entered, the control module opens a relevant valve between the high-pressure air storage tank and the first heat exchanger, an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, closes a switch valve on a refrigerant pipeline in front of the indoor unit, and closes a bypass valve on a bypass pipeline of the second heat exchanger, high-temperature and high-pressure refrigerant steam in the high-pressure air storage tank sequentially enters the indoor first heat exchanger and the indoor second heat exchanger, the first heat exchanger and the second heat exchanger are dried under the action of an indoor fan, meanwhile, air blown out from an air outlet of the indoor unit heats up an air outlet and surrounding structures, when the deviation between the humidity of return air and the humidity of outlet air is smaller than a set value, the;
the working method of the wet working condition single heat exchanger refrigeration dehumidification mode comprises the following steps: the control module opens a bypass valve on a bypass pipeline of the second heat exchanger, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, and closes a first switch valve on a first refrigerant branch pipeline in front of the indoor unit0If so, entering the step 4; the process is a wet cooling process, the first heat exchanger and the air outlet of the indoor unit are subjected to wet cooling, and condensate water can appear;
the working method of the wet working condition double heat exchanger refrigeration dehumidification mode comprises the following steps: the control module opens an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, a second switch valve on a second refrigerant branch in front of the indoor unit, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes a bypass valve on a bypass pipeline of the second heat exchanger, and opens the first heat exchanger and the second heat exchanger, so that refrigerant in the outdoor unit passes through the compressor, the high-pressure gas storage tank and the chamberThe outer heat exchanger enters a liquid storage device, the control module subtracts a second set value from the temperature after throttling to adjust the opening degree of a second throttle valve, high-pressure refrigerant liquid from the liquid storage device sequentially enters the first heat exchanger and the second heat exchanger after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates until the indoor temperature t is less than or equal to t0When the humidity reaches the standard value, + a, entering a single heat exchanger refrigeration and dehumidification mode under a wet working condition; the process is a wet cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are subjected to wet cooling, and condensate water can appear;
the working method of the dry working condition single heat exchanger refrigeration mode comprises the following steps: the control module opens a bypass valve on a bypass pipeline of the second heat exchanger, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes an upstream valve and a downstream valve on an upstream pipeline and a downstream pipeline of the second heat exchanger, and closes a second switch valve on a second refrigerant branch in front of the indoor unit, refrigerant in the outdoor unit enters a liquid storage device through a compressor, the high-pressure gas storage tank and the outdoor heat exchanger by opening the first heat exchanger, the temperature after throttling is dew point temperature, the control module adjusts the opening degree of a first throttle valve according to the sum of the dew point temperature and a first set value, high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger at the temperature slightly higher than the dew point temperature after filtration and throttling, returns to the compressor after phase change heat exchange, and circulates until the refrigeration work is finished; the process is a dry cooling process, the first heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and no condensate water is generated;
the working method of the dry working condition double heat exchanger refrigeration mode comprises the following steps: the control module opens upstream and downstream valves on upstream and downstream pipelines of the second heat exchanger, a first switch valve on a first refrigerant branch in front of the indoor unit, closes a related valve between the high-pressure gas storage tank and the first heat exchanger, closes a bypass valve on a bypass pipeline of the second heat exchanger, and opens the first heat exchanger and the second heat exchanger, refrigerant in the outdoor unit enters a liquid storage device through the compressor, the high-pressure gas storage tank and the outdoor heat exchanger, and throttled warm refrigerant enters the liquid storage device through the throttled warm refrigerant branchThe temperature is dew point temperature, the control module adjusts the opening degree of the first throttle valve according to the sum of the dew point temperature and a first set value, high-pressure refrigerant liquid from the liquid storage device enters the first heat exchanger and the second heat exchanger in sequence at the temperature slightly higher than the dew point temperature after being filtered and throttled, returns to the compressor after phase change heat exchange, and circulates until the indoor temperature t is less than or equal to t0When the pressure is higher than the preset pressure, entering a dry working condition single heat exchanger refrigeration mode; the process is a dry cooling process, the first heat exchanger, the second heat exchanger and the air outlet of the indoor unit are cooled in a dry mode, and condensation water cannot occur.
2. The single-cooling temperature and humidity control multi-split air conditioning system according to claim 1, wherein the bypass valve group comprises an upstream valve, a downstream valve and a bypass valve arranged on a bypass pipeline, the upstream valve and the downstream valve are respectively arranged on an upstream pipeline and a downstream pipeline of the second heat exchanger, an outlet of the first heat exchanger is divided into two paths, one path is connected with a front end of the upstream pipeline of the second heat exchanger, the other path is connected with a front end of the bypass pipeline, and a rear end of the downstream pipeline of the second heat exchanger is connected with a rear end of the bypass pipeline and then is connected with an outdoor unit.
3. A single-cooling type temperature and humidity control multi-split air conditioning system as claimed in claim 1, wherein the first heat exchanger is connected to a second heat exchanger with a bypass valve set and then connected to a gas-liquid separator of an outdoor unit, an outlet pipeline of the gas-liquid separator is connected to an air inlet of a compressor, an air outlet of the compressor is connected to a high-pressure air storage tank through an oil separator, a first outlet of the high-pressure air storage tank is connected to an outdoor heat exchanger, an outlet pipeline of the outdoor heat exchanger is connected to a liquid storage device through an electronic expansion valve, outlet pipelines of the liquid storage device are respectively connected to refrigerant pipelines in front of the indoor units, a filter is disposed on the refrigerant pipelines, and a rear section of the refrigerant pipeline is connected to a front end of the corresponding first heat exchanger through a throttle.
4. The single-cooling type temperature and humidity control multi-split air conditioning system according to claim 3, wherein the throttle valve comprises a first throttle valve and a second throttle valve, the switch valve comprises a first switch valve and a second switch valve, the rear section of the refrigerant pipeline is divided into a first refrigerant branch and a second refrigerant branch, and the first refrigerant branch and the second refrigerant branch are both connected with the front end of the first heat exchanger, the first throttle valve and the first switch valve are arranged on the first refrigerant branch, and the second throttle valve and the second switch valve are arranged on the second refrigerant branch to open the corresponding throttle valve and the corresponding switch valve according to dry and wet conditions.
5. The single-cooling type temperature and humidity control multi-split air conditioning system as claimed in claim 1, wherein the temperature sensor and the outlet humidity sensor are disposed at an outlet of the indoor unit, and the return air humidity sensor is disposed at an inlet of the indoor unit.
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