CN110017563B - Dehumidification control method for double-cold-source fresh air unit - Google Patents

Dehumidification control method for double-cold-source fresh air unit Download PDF

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Publication number
CN110017563B
CN110017563B CN201910245468.XA CN201910245468A CN110017563B CN 110017563 B CN110017563 B CN 110017563B CN 201910245468 A CN201910245468 A CN 201910245468A CN 110017563 B CN110017563 B CN 110017563B
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Prior art keywords
moisture content
air
preset
cold
fresh air
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CN110017563A (en
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杨文秀
朱秋月
张秋云
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN201910245468.XA priority Critical patent/CN110017563B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00Ventilation
    • F24F7/04Ventilation with ducting systems also by double walls; with natural circulation
    • F24F7/06Ventilation with ducting systems also by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08Ventilation with ducting systems also by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/20Humidity

Abstract

The invention belongs to the technical field of air conditioners, and particularly provides a dehumidification control method for a double-cold-source fresh air unit. The invention aims to solve the problem that the existing double-cold-source fresh air unit only controls the dehumidification capacity of the unit by adjusting the water flow in the high-temperature surface cooler, so that the dehumidification capacity is poor. To this end, the dehumidification control method of the present invention comprises the steps of: acquiring the moisture content of the air supply; comparing the air supply moisture content with a preset moisture content so as to judge whether the current dehumidification capacity of the double-cold-source fresh air unit can meet the use requirement of a user; and selectively adjusting the rotating speed of the blower and/or the running state of the low-temperature cold source system according to the comparison result of the moisture content of the air supply and the preset moisture content. The invention improves the dehumidification capacity of the double-cold-source fresh air unit by adjusting the rotating speed of the air feeder and/or the running state of the low-temperature cold source system, so that the dehumidification capacity of the double-cold-source fresh air unit can be greatly improved, and the dehumidification requirement of a user can be effectively met.

Description

Dehumidification control method for double-cold-source fresh air unit
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a dehumidification control method for a double-cold-source fresh air unit.
Background
In recent years, with the improvement of life quality, people have higher and higher requirements for purchasing various electric appliances. Taking an air conditioner as an example, the double-cold-source air conditioning unit is different from the traditional single-cold-source air conditioner in the characteristics of high energy consumption and low temperature control precision, and is more and more favored by people due to the characteristics of energy conservation, comfort, high temperature and humidity control precision and the like. The double-cold-source air conditioning unit is provided with two cold source systems, namely a high-temperature cold source system and a low-temperature cold source system, in the name of the double-cold-source air conditioning unit. The basic operation principle is as follows: sensible heat load and latent heat load in the air are separately processed through the high-temperature cold source system and the low-temperature cold source system, and therefore independent control over the temperature and the humidity of the indoor environment is achieved. Thus, a dual cold source air conditioning unit is also referred to as a dual cold source fresh air (dehumidification) unit.
Although the double-cold-source fresh air unit has the advantages compared with the traditional single-cold-source air conditioner, the existing double-cold-source fresh air unit still has some defects. For example, the existing double-cold-source fresh air unit has a single control logic when dehumidification is performed; specifically, current two cold source fresh air machine group all realizes the control to unit dehumidification ability through the discharge size in the high temperature surface cooler of control high temperature cold source system, and this kind of control mode not only causes great influence to the heat transfer ability of two cold source fresh air machine group easily, and its regulating capability is also very limited moreover, leads to the relatively poor and problem that regulating mode is also not enough intelligent of dehumidification ability of current two cold source fresh air machine group, and then leads to the not good problem of user experience.
Accordingly, there is a need in the art for a new dehumidification control method for a dual cold source fresh air unit that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing dual-cold-source fresh air unit controls the dehumidification capability of the unit only by adjusting the water flow in the high-temperature surface cooler, so that the dehumidification capability is not good, the present invention provides a dehumidification control method for a dual-cold-source fresh air unit, wherein the dual-cold-source fresh air unit comprises a low-temperature cold source system and a blower, and the dehumidification control method comprises the following steps: acquiring the moisture content of the air supply; comparing the air supply moisture content with a preset moisture content; and selectively adjusting the rotating speed of the air blower and/or the running state of the low-temperature cold source system according to the comparison result of the air supply moisture content and the preset moisture content.
In the above-mentioned preferred embodiment of the dehumidification control method for a double-cold-source fresh air unit, the step of "selectively adjusting the rotation speed of the blower and/or the operation state of the low-temperature cold source system according to the comparison result between the supply air moisture content and the preset moisture content" includes: if the air supply moisture content is larger than the preset moisture content, reducing the rotating speed of the air supply fan; if the supply air moisture content is less than or equal to the preset moisture content, keeping the rotating speed of the air blower unchanged.
In the above-described preferred embodiment of the dehumidification control method for a double-cold-source fresh air unit, before the step of "reducing the rotation speed of the blower", the dehumidification control method further includes: and determining the reduction amount of the rotating speed of the blower according to the difference value of the air supply moisture content and the preset moisture content.
In the above-mentioned preferred embodiment of the dehumidification control method for a double-cold-source fresh air unit, the step of "selectively adjusting the rotation speed of the blower and/or the operation state of the low-temperature cold source system according to the comparison result between the supply air moisture content and the preset moisture content" further includes: acquiring the supply air moisture content again in the case where the rotation speed of the supply air blower has been reduced; comparing the supply air moisture content with the preset moisture content; and selectively adjusting the running state of the low-temperature cold source system according to the comparison result of the moisture content of the supplied air and the preset moisture content.
In a preferred embodiment of the dehumidification control method for the double-cold-source fresh air unit, the low-temperature cold source system includes an inverter compressor, and the step of selectively adjusting the operating state of the low-temperature cold source system according to the comparison result between the supply air moisture content and the preset moisture content includes: if the moisture content of the supplied air is larger than the preset moisture content, the variable frequency compressor is communicated, and the low-temperature cold source system is operated; and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the low-temperature cold source system in a shutdown state.
In a preferable embodiment of the dehumidification control method for a double-cold-source fresh air unit, the step of "selectively adjusting the operating state of the low-temperature cold source system according to the comparison result between the supply air moisture content and the preset moisture content" further includes: under the condition that the variable frequency compressor is communicated and the low-temperature cold source system is operated, acquiring the moisture content of the supplied air again; comparing the supply air moisture content with the preset moisture content; and selectively adjusting the frequency of the variable frequency compressor according to the comparison result of the air supply moisture content and the preset moisture content.
In a preferable embodiment of the dehumidification control method for the double-cold-source fresh air unit, the step of selectively adjusting the frequency of the inverter compressor according to the comparison result between the supply air moisture content and the preset moisture content includes: if the moisture content of the supplied air is larger than the preset moisture content, increasing the frequency of the variable frequency compressor; and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the frequency of the variable frequency compressor unchanged.
In the above-described preferred embodiment of the dehumidification control method for a dual cold source fresh air unit, before the step of "increasing the frequency of the inverter compressor", the dehumidification control method further includes: and determining the frequency increase amount of the variable frequency compressor according to the difference value between the air supply moisture content and the preset moisture content.
In a preferred technical solution of the dehumidification control method for a double-cold-source fresh air unit, the low-temperature cold source system further includes a fixed-frequency compressor connected in parallel to the inverter compressor, and the step of selectively adjusting the operation state of the low-temperature cold source system according to a comparison result between the moisture content of the supplied air and the preset moisture content further includes: acquiring the moisture content of the supplied air again under the condition that the frequency of the variable frequency compressor is increased; acquiring the moisture content of the supplied air again under the condition that the frequency of the variable frequency compressor is increased; and selectively communicating the fixed-frequency compressor according to the comparison result of the air supply moisture content and the preset moisture content.
In a preferred embodiment of the dehumidification control method for the double-cold-source fresh air unit, "selectively turning on the fixed-frequency compressor according to a comparison result between the supply air moisture content and the preset moisture content" includes: if the moisture content of the supplied air is larger than the preset moisture content, enabling the fixed-frequency compressor to be communicated; and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the constant-frequency compressor in a disconnected state.
As can be understood by those skilled in the art, in the technical solution of the present invention, the dual cold source fresh air handling unit of the present invention includes a low temperature cold source system and a blower, and the dehumidification control method includes the following steps: acquiring the moisture content of the supplied air so as to judge the current dehumidification capacity of the double-cold-source fresh air unit; comparing the air supply moisture content with a preset moisture content so as to judge whether the current dehumidification capacity of the double-cold-source fresh air unit can meet the use requirement of a user; and then, selectively adjusting the rotating speed of the air blower and/or the running state of the low-temperature cold source system according to the comparison result of the moisture content of the air blower and the preset moisture content. It can be understood that when the supply air moisture content is less than or equal to the preset moisture content, the current dehumidification capacity of the double-cold-source fresh air fan set is enough to meet the requirement of a user, so that no adjustment needs to be made on the current operation state of the double-cold-source fresh air fan set; when the air supply moisture content is greater than the preset moisture content, the current dehumidification capacity of the double-cold-source new fan set cannot meet the user requirement, at the moment, the double-cold-source new fan set improves the current dehumidification capacity of the double-cold-source new fan set by correspondingly adjusting the rotating speed of the air feeder and/or the operation state of the low-temperature cold source system, so that the double-cold-source new fan set can adjust the rotating speed of the air feeder and/or the operation state of the low-temperature cold source system according to the air supply moisture content and the preset moisture content, the dehumidification capacity of the double-cold-source new fan set is effectively improved, and the problem that the dehumidification capacity of the existing double-cold-source new fan set is poor due to the fact that the existing double-cold-source new fan set only controls the unit dehumidification capacity by adjusting the water flow in the high-temperature surface cooler is effectively solved, so that the intelligent degree of the double-cold-source fresh air unit is effectively improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a dual cold source fresh air unit of the present invention;
FIG. 2 is a flow chart of the main steps of the dehumidification control method of the present invention;
fig. 3 is a flowchart of the steps of a preferred embodiment of the dehumidification control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "left", "right", "front", "back", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connecting" should be interpreted broadly, and may be, for example, mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring first to fig. 1, fig. 1 is a schematic view of the overall structure of a double-cold-source fresh air unit according to the present invention. As shown in fig. 1, the dual-cold-source fresh air handling unit of the present invention includes a fresh air processing unit 1 and a condensation heat removal unit 2, wherein the fresh air processing unit 1 is used for processing outdoor fresh air and then sending the processed fresh air into a room, and the condensation heat removal unit 2 is used for processing indoor air and waste heat of the fresh air processing unit 1 and then discharging the processed fresh air to the outside of the room; the double-cold-source fresh air unit further comprises a high-temperature cold source system, a low-temperature cold source system, a heat recovery system and a condensate water recovery system.
Specifically, the high-temperature cold source system comprises a high-temperature surface air cooler 11 arranged in the fresh air processing unit 1, and the high-temperature surface air cooler 11 is used for primarily cooling outdoor fresh air; the low-temperature cold source system comprises a compressor assembly 121 (for better illustration, the compressor assembly 121 is specially drawn outside the fresh air processing unit 1), an evaporator 122, a first condenser 123 and a second condenser 124, wherein the compressor assembly 121 is arranged in the fresh air processing unit 1, and the second condenser 124 is arranged in the condensation heat removal unit 2; the compressor assembly 121 is configured to compress a refrigerant, the compressor assembly 121 includes a variable frequency compressor 1211 and a fixed frequency compressor 1212 which are arranged in parallel, when the dual-cold-source fresh air unit operates in a refrigeration working condition, the evaporator 122 is configured to perform deep cooling and dehumidification on outdoor fresh air, the first condenser 123 is configured to heat the outdoor fresh air after the deep cooling, and the second condenser 124 is configured to dissipate waste heat of the low-temperature cold source system, it should be noted that, when the dual-cold-source fresh air unit operates in the refrigeration working condition, one of the first condenser 123 and the second condenser 124 may be selected for use, or may be used at the same time; meanwhile, when the double-cold-source fresh air unit operates in the heating working condition, the evaporator 122 serves as a condenser to heat fresh air outdoors, the second condenser 124 serves as an evaporator to discharge cold air in the air to be sent into the room outdoors, and the first condenser 123 does not operate, it should be noted that when the double-cold-source fresh air unit operates in the heating working condition, the low-temperature cold source system may not operate, and the double-cold-source fresh air unit only depends on the high-temperature surface cooler 11 to heat air.
Referring next to fig. 1, the heat recovery system includes a first heat exchanger 131, a second heat exchanger 132 disposed in the fresh air processing unit 1, and a heat recovery pump 133 disposed between the first heat exchanger 131 and the second heat exchanger 132; the first heat exchanger 131 is arranged at the upstream of the high-temperature surface cooler 11 and is used for exchanging heat with outdoor fresh air to complete heat recovery; the second heat exchanger 132 is arranged at the downstream of the evaporator 122 and is used for exchanging heat with the deeply cooled outdoor fresh air to complete the utilization of the recovered heat; the heat recovery pump 133 is used to complete the circulation of the heat exchange medium in the first heat exchanger 131 and the second heat exchanger 132. It should be noted that, because there is no heat offset problem in the heating condition, the heat recovery system does not need to be started to recover heat when the dual-cold-source fresh air unit operates in the heating condition; and when the double-cold-source fresh air unit operates in a refrigeration working condition, the heat exchange between the first heat exchanger 131 positioned at the upstream of the high-temperature surface cooler 11 and the fresh air also belongs to cooling, but as the main function of the heat exchange lies in heat recovery, the function of the heat exchange is called pre-cooling in the application, and the heat exchange between the high-temperature surface cooler 11 and the fresh air is called primary cooling. In the present embodiment, "upstream" and "downstream" refer to the flow direction of fresh air in the fresh air processing unit 1 or the indoor air in the condensation heat rejection unit 2. For example, according to the orientation shown in fig. 1, the upstream of the high-temperature surface cooler 11 is the left side of the high-temperature surface cooler 11, the downstream of the evaporator 122 is the right side of the evaporator 122, the upstream of the second condenser 124 is the right side of the second condenser 124, and the downstream of the second condenser 124 is the left side of the second condenser 124.
Further, the condensed water recovery system is disposed in the condensed heat rejection unit 2, and includes a recovery main pipeline 211, a first recovery branch 212 and a second recovery branch 213, and a condensed water recovery pump 214 and a spraying device 215 are disposed on the recovery main pipeline 211; the first recovery branch 212 is connected between the recovery main pipe 211 and the high-temperature surface cooler 11 and used for recovering condensed water generated by the high-temperature surface cooler 11, the second recovery branch 213 is connected between the recovery main pipe 211 and the evaporator 122 and used for recovering the condensed water generated by the evaporator 122, and the spraying device 215 is located above the evaporative condenser and used for spraying and cooling the second condenser 124.
With further reference to fig. 1, the fresh air processing unit 1 is further provided with a first air inlet 171 and a first air outlet 172; the first air outlet 172 is provided with a blower 16 for making fresh air outside flow into the room through the fresh air processing unit 1. A humidifying device 15 is further disposed between the first condenser 123 and the blower 16 for humidifying fresh air flowing into the room. Meanwhile, the condensation heat rejection unit 2 is further provided with a second air inlet 241 and a second air outlet 242; the second outlet 242 is provided with an exhaust fan 23 for allowing the indoor air to flow to the outside through the condensing heat-discharging unit 2.
According to the orientation of fig. 1, as a preferred embodiment, the first heat exchanger 131, the high temperature surface air cooler 11, the evaporator 122, the second heat exchanger 132, the first condenser 123, the humidifying device 15, and the blower 16 are sequentially arranged in a direction from the first air inlet 171 to the first air outlet 172, and the second condenser 124, the condensed water recovery system, and the blower 23 are sequentially arranged in a direction from the second air inlet 241 to the second air outlet 242. The skilled person can understand that the specific structure of the dual cold source fresh air unit does not belong to the protection content of the present invention, and therefore, the skilled person can set the specific structure of the dual cold source fresh air unit according to the actual use requirement as long as the dual cold source fresh air unit can execute the dehumidification control method of the present invention.
Further, the dual-cold-source fresh air handling unit further comprises a moisture content measuring instrument and a controller, wherein the moisture content measuring instrument is arranged at the first air outlet 172, so that the moisture content measuring instrument can detect the air supply moisture content of the dual-cold-source fresh air handling unit; it should be noted that, the present invention does not set any limitation on the specific installation position and the specific structure type of the moisture content measuring instrument, as long as the moisture content measuring instrument can detect the supply air moisture content of the new fan set with two cold sources. The controller can acquire the air supply moisture content of the double-cold-source fresh air unit through the moisture content measuring instrument, and can control the operation condition of each element in the unit, so that the operation state of the double-cold-source fresh air unit is controlled. It can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the dual cold source fresh air handling unit, or may be a controller separately configured to perform the dehumidification control method of the present invention, and the structure and model of the controller may be set by a skilled person according to actual use requirements.
Referring next to fig. 2, a flowchart of the main steps of the dehumidification control method of the present invention is shown. As shown in fig. 2, based on the dual cold source fresh air unit described in the foregoing embodiment, the dehumidification control method of the invention mainly includes the following steps:
s1: acquiring the moisture content of the air supply;
s2: comparing the moisture content of the supplied air with the preset moisture content;
s3: and selectively adjusting the rotating speed of the blower and/or the running state of the low-temperature cold source system according to the comparison result of the moisture content of the air supply and the preset moisture content.
Further, in step S1, during the dehumidification mode of the dual cold source fresh air handling unit, the controller obtains the supply air moisture content of the dual cold source fresh air handling unit through the moisture content measuring instrument. It should be noted that the moisture content measuring instrument may be one element in the dual cold source fresh air unit, or may be an external moisture content measuring instrument, as long as the controller can obtain the moisture content of the supplied air by using the moisture content measuring instrument; meanwhile, the dehumidification mode described in this embodiment may be a single mode, or may be a mixed mode in which the dehumidification mode is combined with other modes, as long as the dual-cold-source fresh air fan unit performs dehumidification. Next, in step S2, the controller can compare the supply air moisture content with the preset moisture content; it should be noted that the preset moisture content represents the dehumidification requirement of the user, so that the user can set the preset moisture content according to the actual use requirement. Furthermore, as can be understood by those skilled in the art, in the embodiment, the comparison between the supplied air moisture content and the preset moisture content may be directly performed by comparing the supplied air moisture content with the preset moisture content, or may be performed by comparing a difference value or a ratio between the supplied air moisture content and the preset moisture content with a preset value, and a specific comparison manner may be set by a skilled person according to a use requirement.
Further, in step S3, the controller can selectively adjust the rotation speed of the blower and/or the operation state of the low temperature heat sink system according to the comparison result between the supply air moisture content and the preset moisture content. Specifically, if the air supply moisture content is greater than the preset moisture content, it indicates that the current dehumidification capacity of the dual-cold-source fresh air unit is not enough to meet the dehumidification demand of the user, and at this time, the controller can adjust the rotation speed of the air blower and/or the operation state of the low-temperature cold source system to improve the current dehumidification capacity of the dual-cold-source fresh air unit to meet the use demand of the user; it should be noted that, in this embodiment, the adjusting the operation state of the low-temperature cold source system may refer to adjusting an on-off state of the low-temperature cold source system, may refer to adjusting the frequency of the variable frequency compressor 1211 or adjusting the communication state of the fixed frequency compressor 1212, and may even refer to adjusting the opening of a valve (not shown in the figure) of the low-temperature cold source system, and the change of these specific operations does not depart from the basic principle of the present invention, that is, it belongs to the protection scope of the present invention as long as the operation can change the operation state of the low-temperature cold source system to improve the current dehumidification capability of the dual-cold-source fresh air fan set. If the moisture content of the supplied air is smaller than or equal to the preset moisture content, the current dehumidification capacity of the double-cold-source fresh air unit is sufficient to meet the current dehumidification requirement of a user, and at the moment, the controller does not need to adjust the rotating speed of the air blower and/or the running state of the low-temperature cold source system.
Referring next to fig. 3, a flowchart illustrating steps of a dehumidification control method according to a preferred embodiment of the present invention is shown. Based on the double-cold-source fresh air unit described in the above embodiments, a preferred embodiment of the present invention specifically includes the following steps:
s101: acquiring the moisture content of the air supply;
s102: judging whether the moisture content of the air supply is greater than the preset moisture content or not; if yes, executing step S104; if not, executing step S103;
s103: keeping the rotating speed of the blower unchanged;
s104: reducing the rotation speed of the blower;
s105: acquiring the supply air moisture content again in the case where the rotation speed of the supply air blower has been reduced;
s106: judging whether the moisture content of the air supply is greater than the preset moisture content or not; if yes, go to step S108; if not, executing step S107;
s107: the low-temperature cold source system is kept in a shutdown state;
s108: communicating the variable frequency compressor and operating the low-temperature cold source system;
s109: under the condition that the variable frequency compressor is communicated and the low-temperature cold source system is operated, acquiring the moisture content of the supplied air again;
s110: judging whether the moisture content of the air supply is greater than the preset moisture content or not; if yes, go to step S112; if not, executing step S111;
s111: keeping the frequency of the inverter compressor unchanged;
s112: increasing the frequency of the inverter compressor;
s113: acquiring the moisture content of the supplied air again under the condition that the frequency of the variable frequency compressor is increased;
s114: judging whether the moisture content of the air supply is greater than the preset moisture content or not; if yes, go to step S116; if not, go to step S115;
s115: keeping the constant-frequency compressor in a disconnected state;
s116: the fixed frequency compressor is communicated.
Further, in step S101, in the process of operating the dual cold source fresh air handling unit in the dehumidification mode, the controller obtains the air supply moisture content of the dual cold source fresh air handling unit through the moisture content measuring instrument, so that the controller can compare the air supply moisture content serving as a basic parameter with the preset moisture content. It should be noted that the moisture content measuring instrument may be one measuring element in the dual cold source fresh air unit, or may be an external moisture content measuring instrument, as long as the controller can obtain the moisture content of the supplied air by the moisture content measuring instrument; meanwhile, the dehumidification mode described in this embodiment may be a single mode, or may be a mixed mode in which the dehumidification mode is combined with other modes, as long as the dual-cold-source fresh air fan unit performs dehumidification.
Further, in step S102, the controller can determine whether the supply air moisture content is greater than the preset moisture content, so as to determine whether the current dehumidification capacity of the dual-cold-source fresh air unit can meet the use requirement of the user, so that the controller can selectively adjust the rotation speed of the blower 16. It should be noted that, in the preferred embodiment, when the dual-cold-source fresh air handling unit just enters the dehumidification mode, the dual-cold-source fresh air handling unit only uses the high-temperature surface cooler 11 and the heat recovery system to achieve the purpose of dehumidification, so as to meet the dehumidification requirement of the user and simultaneously reduce the energy consumption required by the operation of the unit as much as possible. Under the condition, the dehumidification capacity of the double-cold-source fresh air unit can be controlled by selectively changing the rotating speed of the blower 16, and it can be understood that the dehumidification capacity of the double-cold-source fresh air unit can be improved by changing the rotating speed of the blower 16, and the double-cold-source fresh air unit can be realized only by consuming less energy consumption, so that the energy-saving effect is effectively achieved, and therefore, when the current dehumidification capacity of the double-cold-source fresh air unit cannot meet the use requirement of a user, the current dehumidification capacity of the double-cold-source fresh air unit is preferentially improved by changing the rotating speed of the blower 16.
Further, based on the determination result in step S102, if the controller determines that the supply air moisture content is less than or equal to the preset moisture content, it indicates that the current dehumidification capacity of the dual-cold-source new fan set is sufficient to meet the use requirement of the user, in this case, step S103 is executed, i.e. the rotation speed of the blower 16 is kept unchanged, so as to ensure that the energy consumption of the dual-cold-source new fan set is kept unchanged. If the controller judges that the air supply moisture content is greater than the preset moisture content, the current dehumidification capacity of the double-cold-source fresh air unit cannot meet the use requirement of a user, in this case, step S104 is executed, that is, the rotating speed of the air blower 16 is reduced, so that the air which needs to flow into the room can have more sufficient time to contact with the high-temperature surface air cooler 11 and the heat recovery system when flowing through the high-temperature surface air cooler 11 and the heat recovery system, and the dehumidification effect of the double-cold-source fresh air unit can be further improved on the basis of effectively saving the energy consumption of the unit.
Those skilled in the art will appreciate that, as a preferred embodiment, the controller is capable of determining an amount of reduction in the rotational speed of blower 16 based on the difference between the supply air moisture content and the predetermined moisture content; specifically, the greater the difference between the supply air moisture content and the preset moisture content, the greater the reduction in the rotation speed of blower 16; the smaller the difference between the supply air moisture content and the preset moisture content is, the smaller the reduction amount of the rotation speed of the blower 16 is; of course, a technician may set a specific corresponding relationship between the difference between the supply air moisture content and the preset moisture content and the reduction of the rotation speed of the blower 16 according to the specific situation of the double-cold-source fresh air fan set. In addition, in order to ensure the air supply amount of the double-cold-source fresh air fan set, a technician needs to set the minimum rotation speed of the air blower 16, and the rotation speed of the air blower 16 cannot be lower than the set minimum rotation speed all the time during the adjustment process, so as to effectively ensure that the double-cold-source fresh air fan set can have a sufficiently large air supply amount.
Further, in step S105, in the case where the rotation speed of the blower 16 has been reduced, the controller acquires the blower moisture content again by the moisture content measuring instrument; it should be noted that the present invention does not impose any limitation on the final reduction in the rotation speed of blower 16, and the maximum adjustment amount of the rotation speed of blower 16 is to reduce the rotation speed of blower 16 to the minimum rotation speed. Next, in step S106, the controller can determine again whether the supplied air moisture content is greater than the preset moisture content, so as to determine whether the current dehumidification capability of the dual cold source fresh air unit can meet the use requirement of the user, so that the controller can selectively adjust the operation state of the low temperature cold source system. That is to say, when the rotating speed of the blower 16 is reduced and the current dehumidification capacity of the dual cold source fresh air unit is not enough to meet the use requirement of the user, the controller needs to adjust the operation state of the low-temperature cold source system, so as to greatly improve the current dehumidification capacity of the dual cold source fresh air unit, and further effectively ensure that the current dehumidification capacity of the dual cold source fresh air unit can meet the user requirement. In other words, when the current dehumidification capacity of the dual cold source fresh air unit cannot be increased by changing the rotation speed of the blower 16, the present invention can further increase the current dehumidification capacity of the dual cold source fresh air unit again by adjusting the operation state of the low-temperature cold source system, so that the current dehumidification capacity of the dual cold source fresh air unit is sufficient to meet the user requirement.
Further, based on the determination result in step S106, if the controller determines that the supply air moisture content is less than or equal to the preset moisture content, it indicates that the current dehumidification capacity of the dual cold source fresh air fan set is sufficient to meet the use requirement of the user after the rotation speed of the blower 16 is adjusted, in this case, step S107 is executed, i.e., the low temperature cold source system is kept in a shutdown state, so as to ensure that the energy consumption of the dual cold source fresh air fan set is kept unchanged. If the controller determines that the air supply moisture content is still greater than the preset moisture content, it indicates that the current dehumidification capacity of the dual-cold-source fresh air unit still cannot meet the user requirement, in this case, step S108 is executed, that is, the inverter compressor 1211 is connected and the low-temperature cold source system is operated, so that the low-temperature cold source system can perform a further dehumidification treatment on the air flowing into the room, and the dehumidification effect of the dual-cold-source fresh air unit is effectively improved. In addition, it should be noted that, during the operation of the low-temperature cold source system, the inverter compressor 1211 and the fixed-frequency compressor 1212 may be used alternatively or simultaneously, and in the preferred embodiment, the controller preferentially connects the inverter compressor 1211, so that the controller can adjust the current dehumidification capacity of the dual-cold-source fresh air unit by controlling the frequency of the inverter compressor 1211 first, thereby effectively improving the flexibility of the adjustment process. Of course, this communication method is not limited, and the technician may first communicate the fixed-frequency compressor 1212, that is, the technician may set the specific communication method according to the actual use requirement.
Further, in step S109, in the case where the inverter compressor 1211 has been brought into communication and the low temperature heat source system is operated, the controller acquires the supplied air moisture content again by the moisture content measuring instrument; it should be noted that there is an initial set value for the frequency of the inverter compressor 1211, and the operation of the low temperature heat sink system described herein refers to the operation under the condition that the frequency of the inverter compressor 1211 is at the initial set value, but a skilled person may set the initial frequency of the inverter compressor 1211 according to actual use requirements. In addition, it can be understood that after the low-temperature cold source system is operated, the current dehumidification capacity of the double-cold-source fresh air unit is changed, so that the moisture content of the supplied air obtained at the moment is different from the moisture content of the supplied air obtained before. Next, in step S110, the controller can determine again whether the supply air moisture content is greater than the preset moisture content, so as to determine whether the current dehumidification capacity of the dual cold source fresh air unit can meet the use requirement of the user, thereby enabling the controller to selectively adjust the frequency of the inverter compressor 1211. Specifically, when the low-temperature cold source system is operated in an initial state, which is not enough to enable the current dehumidification capacity of the dual-cold-source fresh air fan set to meet the user requirement, the controller can further adjust the frequency of the variable frequency compressor 1211, so as to improve the heat exchange capacity of the low-temperature cold source system, so that water vapor in the air can be more easily liquefied when contacting the evaporator 122 of the low-temperature cold source system, and further, the current dehumidification capacity of the dual-cold-source fresh air fan set is further improved again, so that the current dehumidification capacity of the dual-cold-source fresh air fan set is enough to meet the user requirement.
Further, based on the determination result of step S110, if the controller determines that the supply air moisture content is less than or equal to the preset moisture content, it indicates that the current dehumidification capacity of the dual cold source new fan set is sufficient to meet the use requirement of the user after the low temperature cold source system is operated in the initial state, in this case, step S111 is executed, that is, the frequency of the variable frequency compressor 1211 is kept unchanged, so as to ensure that the energy consumption of the dual cold source new fan set is kept unchanged. If the controller determines that the air supply moisture content is still greater than the preset moisture content, it indicates that the current dehumidification capacity of the dual cold source fresh air fan set still cannot meet the use requirement of the user, in this case, step S112 is executed, that is, the frequency of the variable frequency compressor 1211 is increased, so that the heat exchange capacity of the low temperature cold source system is effectively improved, so that the water vapor in the air can be more easily liquefied when contacting the evaporator 122, and the current dehumidification capacity of the dual cold source fresh air fan set is further improved.
As can be appreciated by those skilled in the art, the controller can determine the amount of increase in the frequency of the inverter compressor 1211 based on the difference between the supply air moisture content and the preset moisture content; specifically, the larger the difference between the supply air moisture content and the preset moisture content is, the larger the increase amount of the frequency of the inverter compressor 1211 is; the smaller the difference between the supplied air moisture content and the preset moisture content is, the smaller the increase amount of the rotation speed of the blower 16 is; of course, a technician may set a specific corresponding relationship between the difference between the supplied air moisture content and the preset moisture content and the increase amount of the frequency of the inverter compressor 1211 according to the specific situation of the dual-cold-source fresh air unit.
Further, in step S113, in the case where the frequency of the inverter compressor 1211 has been increased, the controller acquires the supply air moisture content again by the moisture content measuring instrument; it should be noted that the present invention does not impose any limitation on the final amount of increase in the frequency of the inverter compressor 1211, and preferably, the maximum amount of adjustment of the frequency of the inverter compressor 1211 is to increase the frequency of the inverter compressor 1211 to the maximum frequency of the inverter compressor 1211. Next, in step S114, the controller can determine again whether the supply air moisture content is greater than the preset moisture content, so as to determine whether the current dehumidification capability of the dual cold source fresh air unit can meet the use requirement of the user, so that the controller can selectively communicate with the fixed frequency compressor 1212 of the low temperature cold source system. Specifically, when the frequency of the variable frequency compressor 1211 is not enough to enable the current dehumidification capacity of the dual cold source fresh air unit to meet the use requirement of the user, the controller can further communicate the fixed frequency compressor 1212, so as to increase the heat exchange capacity of the low temperature cold source system again, and further effectively increase the current dehumidification capacity of the dual cold source fresh air unit.
Further, based on the determination result in step S114, if the controller determines that the supply air moisture content is less than or equal to the preset moisture content, it indicates that the current dehumidification capacity of the dual-cold-source fresh air fan set is sufficient to meet the use requirement of the user after the frequency of the inverter compressor 1211 is adjusted, in this case, step S115 is executed, that is, the fixed-frequency compressor 1212 is kept in the off state, so as to ensure that the energy consumption of the dual-cold-source fresh air fan set is kept unchanged. Meanwhile, if the controller determines that the air supply moisture content is still greater than the preset moisture content, it indicates that the current dehumidification capacity of the dual-cold-source fresh air unit still cannot meet the use requirement of the user, and in this case, step S116 is executed, that is, the fixed-frequency compressor 1212 is communicated, so that the heat exchange capacity of the low-temperature cold source system is increased again, and the current dehumidification capacity of the dual-cold-source fresh air unit is increased to the maximum extent to meet the user requirement. In addition, it should be noted that, as a preferred embodiment, a skilled person can set the highest operation frequency of the inverter compressor 1211 and the frequency of the fixed frequency compressor 1212 to be the same, so as to flexibly control the frequency adjustment range of the compressor assembly 121.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the technical solutions of the present invention have been described with reference to the accompanying drawings, but it is obvious to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (6)

1. A dehumidification control method for a double-cold-source fresh air unit is characterized in that the double-cold-source fresh air unit comprises a low-temperature cold source system and a blower, and the dehumidification control method comprises the following steps:
acquiring the moisture content of the air supply;
comparing the air supply moisture content with a preset moisture content;
selectively adjusting the rotating speed of the blower and/or the running state of the low-temperature cold source system according to the comparison result of the moisture content of the supplied air and the preset moisture content;
the step of "selectively adjusting the rotation speed of the blower and/or the operation state of the low temperature heat sink system according to the comparison result between the supply air moisture content and the preset moisture content" includes:
if the air supply moisture content is larger than the preset moisture content, reducing the rotating speed of the air supply fan;
the step of "selectively adjusting the rotation speed of the blower and/or the operation state of the low temperature heat sink system according to the comparison result between the supply air moisture content and the preset moisture content" further includes:
acquiring the supply air moisture content again in the case where the rotation speed of the supply air blower has been reduced;
comparing the supply air moisture content with the preset moisture content;
selectively adjusting the running state of the low-temperature cold source system according to the comparison result of the air supply moisture content and the preset moisture content;
the low-temperature cold source system comprises a variable frequency compressor, and the step of selectively adjusting the running state of the low-temperature cold source system according to the comparison result of the moisture content of the supplied air and the preset moisture content comprises the following steps:
if the moisture content of the supplied air is larger than the preset moisture content, the variable frequency compressor is communicated, and the low-temperature cold source system is operated;
the step of selectively adjusting the operation state of the low temperature heat sink system according to the comparison result of the moisture content of the supplied air and the preset moisture content further comprises the following steps:
under the condition that the variable frequency compressor is communicated and the low-temperature cold source system is operated, acquiring the moisture content of the supplied air again;
comparing the supply air moisture content with the preset moisture content;
selectively adjusting the frequency of the variable frequency compressor according to the comparison result of the air supply moisture content and the preset moisture content;
the step of selectively adjusting the frequency of the inverter compressor according to the comparison result of the supply air moisture content and the preset moisture content comprises the following steps:
if the moisture content of the supplied air is larger than the preset moisture content, increasing the frequency of the variable frequency compressor;
the low-temperature cold source system further comprises a fixed-frequency compressor connected in parallel with the variable-frequency compressor, and the step of selectively adjusting the running state of the low-temperature cold source system according to the comparison result of the moisture content of the supplied air and the preset moisture content further comprises the following steps:
acquiring the moisture content of the supplied air again under the condition that the frequency of the variable frequency compressor is increased;
comparing the supply air moisture content with the preset moisture content;
selectively communicating the fixed-frequency compressor according to the comparison result of the air supply moisture content and the preset moisture content;
the step of selectively turning on the fixed frequency compressor according to the comparison result of the supply air moisture content and the preset moisture content comprises the following steps:
if the moisture content of the supplied air is larger than the preset moisture content, enabling the fixed-frequency compressor to be communicated;
and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the constant-frequency compressor in a disconnected state.
2. The dehumidification control method according to claim 1, wherein the step of selectively adjusting the rotation speed of the blower and/or the operation state of the low temperature heat sink system according to the comparison result between the supply air moisture content and the preset moisture content further comprises:
if the supply air moisture content is less than or equal to the preset moisture content, keeping the rotating speed of the air blower unchanged.
3. The dehumidification control method according to claim 2, wherein, prior to the step of "reducing the rotation speed of the blower", the dehumidification control method further comprises:
and determining the reduction amount of the rotating speed of the blower according to the difference value of the air supply moisture content and the preset moisture content.
4. The dehumidification control method according to claim 1, wherein the step of selectively adjusting the operation state of the low temperature heat sink system according to the comparison result between the supply air moisture content and the preset moisture content further comprises:
and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the low-temperature cold source system in a shutdown state.
5. The dehumidification control method according to claim 1, wherein the step of selectively adjusting the frequency of the inverter compressor according to the comparison of the supply air moisture content and the preset moisture content further comprises:
and if the moisture content of the supplied air is less than or equal to the preset moisture content, keeping the frequency of the variable frequency compressor unchanged.
6. The dehumidification control method according to claim 5, wherein before the step of increasing the frequency of the inverter compressor, the dehumidification control method further comprises:
and determining the frequency increase amount of the variable frequency compressor according to the difference value between the air supply moisture content and the preset moisture content.
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