CN112303827B - Control method of combined air-conditioning system - Google Patents
Control method of combined air-conditioning system Download PDFInfo
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- CN112303827B CN112303827B CN202011196734.3A CN202011196734A CN112303827B CN 112303827 B CN112303827 B CN 112303827B CN 202011196734 A CN202011196734 A CN 202011196734A CN 112303827 B CN112303827 B CN 112303827B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of a combined air conditioning system. The invention aims to solve the problems that the existing air conditioning unit has poor mode of coping with overhigh high pressure of a compressor and is easy to cause adverse effect on the refrigerating effect of the unit. Therefore, the combined air-conditioning system can selectively cooperate with the refrigerant circulation loop and the ground cooling branch to exchange heat with the secondary refrigerant circulation loop, when the outdoor temperature is greater than or equal to the preset outdoor temperature, the secondary refrigerant circulation loop is selectively communicated with the ground cooling branch according to the high-pressure of the refrigerant circulation loop, so that the secondary refrigerant flows through the ground cooling branch in the circulation process to be cooled through the underground cold source, the ground cooling branch assists in refrigeration and accordingly reduces the load of the refrigerant circulation loop, the high-pressure of the compressor can be quickly recovered to the normal pressure range, and the combined air-conditioning system is effectively guaranteed to continuously and reliably perform refrigeration operation, so that the refrigeration requirements of users are effectively met.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of a combined air conditioning system.
Background
Along with the continuous improvement of the living standard of people, the air conditioning unit becomes a heat exchange device essential to the life of people. Although the types of the existing air conditioning units are more and more, and the overall structure is continuously updated, the compressor is always an essential important element of various air conditioning units, and the running state of the compressor can directly influence the reliability of the whole air conditioning unit. Generally, when the ambient temperature is not very high, the air conditioning unit can normally perform cooling operation, but when the ambient temperature is very high, particularly when the air conditioning unit is used in some high-temperature areas, the compressor of the air conditioning unit is easy to malfunction due to high-load operation. Especially when the air conditioning unit is restarted after being shut down for a long time, the temperature of water in a heat exchange pipe of the air conditioning unit is very high, and the target temperature required by a user is usually very low; this high load operating requirement can easily cause the compressor to give an excessive high pressure warning and even lead directly to a problem of a failed shutdown. This not only affects the cooling performance of the air conditioning unit, but also can cause severe damage to the compressor due to frequent high-pressure start and stop. In order to make the air conditioning unit perform cooling in a high temperature environment better, many solutions have been proposed by the prior art, but the prior solutions are all based on adjusting various operation parameters of the air conditioning unit itself to achieve the purpose of reducing the high pressure, such as adjusting the opening degree of an electronic expansion valve, the operation frequency of a compressor, and the like. Although the modes can also achieve the effect of reducing the high pressure to a certain extent, the adjustment of the parameters can affect the refrigerating capacity of the air conditioning unit, so that the refrigerating effect is poor, the adjustment and control process is very complicated, and the actual application effect is not very ideal.
Accordingly, there is a need in the art for a new control method of a combined air conditioning system to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problems that the existing air conditioning unit is poor in a mode of coping with overhigh high pressure of a compressor and is easy to cause adverse effects on a refrigeration effect, the invention provides a control method of a combined air conditioning system, wherein the combined air conditioning system comprises a refrigerant circulating loop, a ground cold branch and a secondary refrigerant circulating loop, secondary refrigerant in the secondary refrigerant circulating loop can exchange heat with refrigerant in the refrigerant circulating loop, and the secondary refrigerant circulating loop can be selectively communicated with the ground cold branch and accordingly enables the secondary refrigerant to flow through the ground cold branch in a circulating process to be cooled through an underground cold source; the control method comprises the following steps: acquiring the outdoor temperature and the liquid inlet temperature of the secondary refrigerant circulation loop; if the liquid inlet temperature of the secondary refrigerant circulation loop is higher than the target liquid inlet temperature, the combined air-conditioning system performs refrigeration operation in a heat exchange mode of the secondary refrigerant circulation loop and the secondary refrigerant circulation loop; if the outdoor temperature is greater than or equal to the preset outdoor temperature, further comparing the liquid inlet temperature of the secondary refrigerant circulation loop with a first preset liquid inlet temperature; if the liquid inlet temperature of the secondary refrigerant circulation loop is greater than or equal to the first preset liquid inlet temperature, acquiring the high-pressure of the refrigerant circulation loop in the refrigerating operation process of the combined air-conditioning system; selectively communicating the secondary refrigerant circulation loop with the ground cooling branch according to the high-pressure of the secondary refrigerant circulation loop; wherein the first preset inlet liquid temperature is greater than the target inlet liquid temperature.
In a preferred embodiment of the above control method, the step of selectively communicating the coolant circulation circuit with the ground cooling branch according to the high pressure of the coolant circulation circuit includes: and if the high pressure of the refrigerant circulation loop is greater than or equal to the preset high pressure, communicating the secondary refrigerant circulation loop with the ground cooling branch.
In a preferred embodiment of the above control method, the control method further includes: and determining the first preset liquid inlet temperature according to the condensing temperature corresponding to the high pressure of the refrigerant circulation loop and the outdoor temperature.
In a preferred embodiment of the above control method, the step of determining the first preset inlet temperature according to the condensing temperature corresponding to the high pressure of the refrigerant circulation loop and the outdoor temperature includes calculating the first preset inlet temperature by using the following equation:
T1＝(Tcold－TOuter cover)*k1+k2
Wherein, T1Is the first predetermined inlet temperature, TColdA condensing temperature, T, corresponding to a high pressure of the refrigerant circulation circuitOuter coverIs the outdoor temperature, k1Is a first correction coefficient, k2Is the second correction coefficient.
In a preferred embodiment of the control method, the first correction coefficient k is1Equal to 0.8 and/or a second correction factor k2Equal to 3.
In a preferred embodiment of the above control method, the step of selectively communicating the coolant circulation circuit with the ground cooling branch circuit according to the high pressure of the coolant circulation circuit further includes: and if the high-pressure of the refrigerant circulation loop is less than the preset high-pressure, the secondary refrigerant circulation loop is not communicated with the ground cooling branch.
In a preferred technical solution of the above control method, the step of causing the combined air conditioning system to perform cooling operation in a manner of exchanging heat between the coolant circulation loop and the coolant circulation loop if the feed liquid temperature of the coolant circulation loop is greater than the target feed liquid temperature further includes: and if the duration time that the liquid inlet temperature of the secondary refrigerant circulation loop is greater than the target liquid inlet temperature reaches a first preset time, enabling the combined air-conditioning system to carry out refrigeration operation in a heat exchange mode between the secondary refrigerant circulation loop and the refrigerant circulation loop.
In a preferred embodiment of the above control method, the control method further includes: and determining the first preset time according to the magnitude relation between the outdoor temperature and the preset outdoor temperature.
In a preferred embodiment of the above control method, after the step of "communicating the coolant circulation circuit with the ground cooling branch", the control method further includes: after a preset time, obtaining the liquid inlet temperature of the secondary refrigerant circulation loop again; if the liquid inlet temperature obtained again is lower than a second preset liquid inlet temperature, cutting off the communication relation between the refrigerating medium circulation loop and the ground cooling branch; and the second preset liquid inlet temperature is less than or equal to the first preset liquid inlet temperature.
In a preferred technical solution of the above control method, the step of cutting off the communication relationship between the coolant circulation loop and the ground cooling branch if the liquid inlet temperature obtained again is lower than a second preset liquid inlet temperature further includes: and if the duration time that the liquid inlet temperature obtained again is less than the second preset liquid inlet temperature reaches a second preset duration, cutting off the communication relation between the secondary refrigerant circulation loop and the ground cooling branch.
As can be understood by those skilled in the art, in the technical solution of the present invention, the combined air conditioning system of the present invention includes a refrigerant circulation loop, a ground cold branch and a coolant circulation loop, wherein coolant in the coolant circulation loop can exchange heat with coolant in the refrigerant circulation loop, and the coolant circulation loop can also be selectively communicated with the ground cold branch and thus make coolant flow through the ground cold branch during circulation to cool down through an underground cold source, so as to reduce the load of the coolant circulation loop; the control method of the invention comprises the following steps: acquiring the outdoor temperature and the liquid inlet temperature of the secondary refrigerant circulation loop; if the liquid inlet temperature of the secondary refrigerant circulation loop is higher than the target liquid inlet temperature, the combined air-conditioning system performs refrigeration operation in a heat exchange mode of the secondary refrigerant circulation loop and the secondary refrigerant circulation loop; if the outdoor temperature is greater than or equal to the preset outdoor temperature, further comparing the liquid inlet temperature of the secondary refrigerant circulation loop with a first preset liquid inlet temperature; if the liquid inlet temperature of the secondary refrigerant circulation loop is greater than or equal to the first preset liquid inlet temperature, acquiring the high-pressure of the refrigerant circulation loop in the refrigerating operation process of the combined air-conditioning system; selectively communicating the secondary refrigerant circulation loop with the ground cooling branch according to the high-pressure of the secondary refrigerant circulation loop; wherein the first preset inlet liquid temperature is greater than the target inlet liquid temperature. The combined air-conditioning system disclosed by the invention is matched with the refrigerant circulation loop and the ground cooling branch, when the outdoor temperature is greater than or equal to the preset outdoor temperature, the control method can selectively enable the secondary refrigerant circulation loop to be communicated with the ground cooling branch according to the high pressure of the refrigerant circulation loop so as to enable the ground cooling branch to assist in refrigeration and reduce the load of the refrigerant circulation loop, so that the high pressure of a compressor arranged on the refrigerant circulation loop can be quickly recovered to be within a normal pressure range, and further, the combined air-conditioning system is effectively ensured to continuously and reliably perform refrigeration operation, so that the refrigeration requirements of users are effectively met.
Drawings
Fig. 1 is a schematic view of the overall construction of a combined air conditioning system of the present invention;
FIG. 2 is a flow chart of the main steps of the control method of the present invention;
FIG. 3 is a flow chart of the steps of a preferred embodiment of the control method of the present invention;
reference numerals:
11. a compressor; 12. an evaporator; 13. a throttling member; 14. a condenser; 15. a four-way valve; 16. a heat exchange fan;
21. a buried pipe; 22. a liquid pump;
101. a liquid inlet three-way valve; 102. a liquid outlet three-way valve; 103. and a liquid inlet temperature sensor.
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. And can be adjusted as needed by those skilled in the art to suit particular applications. Further, in the description of the present invention, although the respective steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
It should be noted that in the description of the preferred embodiment of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "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.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected 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, the overall structure of the combined air conditioning system of the present invention is schematically shown. The combined air conditioning system comprises a refrigerant circulation loop (a part positioned in a right square frame), a ground cold branch and a secondary refrigerant circulation loop, wherein secondary refrigerant in the secondary refrigerant circulation loop can exchange heat with refrigerant in the refrigerant circulation loop to reduce the temperature of the secondary refrigerant in the secondary refrigerant circulation loop, the secondary refrigerant in the secondary refrigerant circulation loop exchanges heat with indoor air again to realize refrigeration, and the secondary refrigerant circulation loop can be selectively communicated with the ground cold branch and can flow through the ground cold branch in the circulation process to reduce the temperature through an underground cold source, so that the ground cold branch can assist the refrigerant circulation loop in reducing the temperature of the secondary refrigerant in the secondary refrigerant circulation loop. As shown in fig. 1, in the preferred embodiment, the refrigerant circulation loop includes a refrigerant pipeline, and a compressor 11, an evaporator 12, a throttling member 13, a condenser 14 and a four-way valve 15 which are sequentially connected through the refrigerant pipeline, wherein the evaporator 12 adopts a water-cooled evaporator, the condenser 14 adopts an air-cooled condenser, the refrigerant in the refrigerant pipeline circulates between the water-cooled evaporator 12 and the air-cooled condenser 14 to continuously exchange heat, and a heat exchange fan 16 is further disposed near the condenser 14 to improve heat exchange efficiency. It should be noted that, the invention does not limit the specific structure of the refrigerant circulation loop, and a technician can set the configuration according to the actual use requirement as long as the refrigerant circulation loop can exchange heat with the secondary refrigerant circulation loop; for example, the refrigerant circulation circuit may further include only a refrigerant pipeline, and a compressor 11, an evaporator 12, a throttling member 13, and a condenser 14 that are sequentially connected through the refrigerant pipeline; and a skilled person can set the specific types of the compressor 11, the evaporator 12, the throttling member 13, the condenser 14 and the four-way valve 15 at will according to the actual use requirements. Changes in this detailed structure can be made without departing from the basic principles of the invention and are intended to be within the scope of the invention.
With continued reference to fig. 1, the ground cooling branch includes a ground cooling pipeline, and a buried pipe 21 and a liquid pump 22 connected through the ground cooling pipeline, wherein the buried pipe 21 is buried underground, the underground cold source can cool the coolant in the buried pipe 21 when the coolant passes through the buried pipe 21, and the buried pipe 21 in the preferred embodiment is formed by connecting a plurality of U-shaped pipes in parallel, so as to effectively improve the heat exchange capability. It should be noted that, the invention does not limit the specific structure of the ground cold branch, as long as the secondary refrigerant can exchange heat with the underground cold source when passing through the ground cold branch; for example, a part of the ground cooling pipeline can be directly buried underground to realize heat exchange with an underground cooling source.
Further, a part of the coolant circulation circuit is disposed in the water-cooled evaporator 12, so that the coolant flowing through the evaporator 12 can exchange heat with the coolant in the coolant circulation circuit to cool the coolant. A liquid inlet three-way valve 101 and a liquid outlet three-way valve 102 are further arranged on the refrigerating medium circulation loop, the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102 are respectively positioned at the upper side and the lower side of the evaporator 12, wherein two valve ports of the liquid inlet three-way valve 101 are used for being communicated with the refrigerating medium circulation loop, and the other valve port is connected with the upper end of the ground cooling pipeline; two valve ports of the liquid outlet three-way valve 102 are communicated with the coolant circulation loop, and the other valve port is connected with the lower end of the ground cooling pipeline, so that the coolant circulation loop and the ground cooling branch are coupled through the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102, and the communication relationship between the coolant circulation loop and the ground cooling branch can be controlled by controlling the communication states of the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102. It should be noted that the manner of controlling the communication relationship is not limited, and the technician may set the communication relationship according to the actual use requirement, for example, the communication relationship may be implemented by matching a plurality of check valves; in addition, the invention does not carry out any limitation on the types of the secondary refrigerant used in the secondary refrigerant circulation loop, and technicians can set the secondary refrigerant used in the secondary refrigerant circulation loop according to actual use requirements; preferably, the coolant used in the coolant circulation circuit is water, which is cost effective.
In addition, the combined air conditioning system of the present invention further includes an inlet temperature sensor 103 and a controller, wherein the inlet temperature sensor 103 is disposed on the coolant circulation loop to detect an inlet temperature of the coolant circulation loop, that is, a temperature of the coolant before heat exchange with the evaporator 12, and the controller is capable of acquiring a detection result of the inlet temperature sensor 103. It should be noted that the specific installation position of the liquid inlet temperature sensor 103 is not limited in the present invention, and the technician can set the position according to the actual use requirement. The controller can also control the operation state of the combined air conditioning system, for example, control the refrigerant circulation loop to exchange heat with the secondary refrigerant circulation loop to realize refrigeration, control the communication state of the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102, and the like. In addition, 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 combined air conditioning system, or may be a controller separately provided for executing the control method of the present invention, and the skilled person can set the specific structure and model of the controller according to the actual use requirement.
Referring next to fig. 2, a flow chart of the main steps of the control method of the present invention is shown. As shown in fig. 2, based on the combined air conditioning system described in the above preferred embodiment, the control method of the present invention mainly includes the following steps:
s1: acquiring the outdoor temperature and the liquid inlet temperature of a secondary refrigerant circulation loop;
s2: if the liquid inlet temperature is higher than the target liquid inlet temperature, the combined air-conditioning system performs refrigeration operation in a way of exchanging heat between the secondary refrigerant circulation loop and the refrigerant circulation loop;
s3: if the outdoor temperature is greater than or equal to the preset outdoor temperature, further comparing the liquid inlet temperature with the first preset liquid inlet temperature;
s4: if the liquid inlet temperature is greater than or equal to the first preset liquid inlet temperature, acquiring the high-pressure of a refrigerant circulation loop in the refrigerating operation process of the combined air-conditioning system;
s5: and selectively communicating the secondary refrigerant circulation loop with the ground cooling branch according to the high-pressure of the secondary refrigerant circulation loop.
In step S1, the controller can acquire the outdoor temperature through the outdoor temperature sensor, and acquire the feed temperature of the coolant circulation circuit through the feed temperature sensor 103. It should be noted that, the invention does not limit the specific way for the controller to obtain the outdoor temperature, and the technician can set the temperature according to the actual use requirement; for example, the outdoor temperature may be obtained by an outdoor temperature sensor provided in the air conditioning system itself, may be obtained by an external outdoor temperature sensor, and may be obtained in a network-connected manner, which is not limited.
In step S2, if the controller determines that the feed liquid temperature of the secondary refrigerant circulation circuit obtained by the feed liquid temperature sensor 103 is higher than the target feed liquid temperature, it indicates that the feed liquid temperature is too high, and in this case, the controller controls the combined air conditioning system to perform cooling operation in a heat exchange manner between the secondary refrigerant circulation circuit and the refrigerant circulation circuit, so as to reduce the feed liquid temperature of the secondary refrigerant circulation circuit to the target feed liquid temperature, thereby effectively meeting the cooling requirement of the user. It should be noted that the target inlet liquid temperature may be a temperature value set by a user, or may be a fixed value stored in the controller, and the source is not limited.
Next, in step S3, if the controller determines that the obtained outdoor temperature is greater than or equal to the preset outdoor temperature, it indicates that the refrigerant circulation loop may have a problem of an excessive load; at this time, the controller can further compare the liquid inlet temperature of the coolant circulation loop acquired by the liquid inlet temperature sensor 103 with the first preset liquid inlet temperature, so as to further determine whether the coolant circulation loop has the problem of too high load. It should be noted that, the present invention does not limit the specific values of the preset outdoor temperature and the first preset inlet liquid temperature, and a technician can set the values according to actual situations, as long as the first preset inlet liquid temperature is greater than the target inlet liquid temperature; preferably, the preset outdoor temperature is 43 ℃.
Further, in step S4, if the controller determines that the inlet temperature of the coolant circulation loop is greater than or equal to the first predetermined inlet temperature, the controller needs to obtain the high pressure of the coolant circulation loop during the cooling operation of the combined air conditioning system, and the high pressure can be obtained by arranging a pressure sensor at the exhaust port of the compressor 11, so as to further accurately determine whether the compressor 11 is in the operation state with too high pressure. Next, in step S5, the controller selectively communicates the coolant circulation circuit with the ground cooling branch according to the high pressure of the coolant circulation circuit, so as to selectively use the ground cooling branch for auxiliary cooling according to actual requirements, thereby effectively ensuring the safety of the compressor 11 and further effectively ensuring the continuous and reliable operation of the coolant circulation circuit on the basis of ensuring the cooling effect.
Reference is now made to fig. 3, which is a flow chart of the steps of a preferred embodiment of the control method of the present invention. As shown in fig. 3, based on the combined air conditioning system described in the above preferred embodiment, the preferred embodiment of the present invention specifically includes the following steps:
s101: acquiring the liquid inlet temperature of a secondary refrigerant circulation loop;
s102: judging whether the liquid inlet temperature is higher than the target liquid inlet temperature or not; if yes, go to step S103; if not, executing step S101;
s103: the combined air-conditioning system is refrigerated and operated in a mode of exchanging heat between the secondary refrigerant circulation loop and the refrigerant circulation loop;
s104: acquiring outdoor temperature;
s105: judging whether the outdoor temperature is greater than or equal to a preset outdoor temperature; if yes, go to step S107; if not, executing step S106;
s106: the refrigerating medium circulation loop is not communicated with the ground cooling branch;
s107: judging whether the liquid inlet temperature is greater than or equal to a first preset liquid inlet temperature or not; if yes, go to step S108; if not, executing step S106;
s108: acquiring the high pressure of a refrigerant circulation loop in the refrigerating operation process of the combined air-conditioning system;
s109: judging whether the high-pressure is greater than or equal to a preset high-pressure or not; if yes, go to step S110; if not, executing step S106;
s110: communicating the coolant circulation loop with the ground cooling branch;
s111: after the preset time, the liquid inlet temperature of the secondary refrigerant circulation loop is obtained again;
s112: judging whether the liquid inlet temperature is lower than a second preset liquid inlet temperature or not; if so, go to step S113; if not, executing step S111;
s113: and cutting off the communication relation between the refrigerating medium circulation loop and the ground cooling branch.
In step S101, the controller obtains the inlet temperature of the coolant circulation loop through the inlet temperature sensor 103. Next, in step S102, the controller determines whether the acquired inlet liquid temperature is greater than the target inlet liquid temperature, so as to selectively enable the combined air conditioning system to start a cooling mode.
Based on the judgment result of the step S102, if the liquid inlet temperature of the secondary refrigerant circulation loop is greater than the target liquid inlet temperature, it indicates that the liquid inlet temperature is too high, and in this case, step S103 is executed, that is, the controller controls the communication state of the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102, so that the combined air conditioning system performs refrigeration operation in a manner that the secondary refrigerant circulation loop exchanges heat with the secondary refrigerant circulation loop, so as to reduce the liquid inlet temperature of the secondary refrigerant circulation loop to the target liquid inlet temperature, and further effectively meet the refrigeration requirements of users.
As a preferred embodiment, in step S102, the controller can further determine a duration that the feed liquid temperature of the coolant circulation loop is greater than the target feed liquid temperature, and perform step S103 when the duration that the feed liquid temperature of the coolant circulation loop is greater than the target feed liquid temperature reaches a first preset duration, so as to effectively improve the accuracy of the determination result. It should be noted that, a technician may set the first preset time period according to an actual use requirement. Preferably, the first preset time period is determined by a magnitude relation between the outdoor temperature and the preset outdoor temperature, that is, a first preset time period adopted when the outdoor temperature is greater than or equal to the preset outdoor temperature is different from a first preset time period adopted when the outdoor temperature is less than the preset outdoor temperature; specifically, the outdoor temperature is greater than or equal to the first preset duration adopted when the outdoor temperature is preset, the first preset duration adopted when the outdoor temperature is smaller than the first preset duration adopted when the outdoor temperature is preset, so that the combined air-conditioning system can respond to the refrigeration demand in time under the high-temperature environment, the refrigeration demand of a user can be met quickly, the refrigeration load of the combined air-conditioning system can be reduced properly, and the stability of the system is protected better.
Next, in step S104, the controller can acquire an outdoor temperature through an outdoor temperature sensor so as to determine an external working environment of the combined air conditioning system. Of course, it should be noted that the execution time of step S104 is not limited in the present invention, and the technician can adjust the execution time according to the actual use requirement; for example, step S104 may be performed in synchronization with step S101, or may even be performed before step S101, which is not limiting.
Based on the judgment result of the step S105, if the outdoor temperature is less than the preset outdoor temperature, it indicates that the air conditioning system is not operated in a high temperature environment, and thus there is no risk of too high pressure; in this case, step S106 is executed, that is, the coolant circulation loop is not communicated with the ground cooling branch, and the air conditioning system is only required to perform the cooling operation in a heat exchange manner between the coolant circulation loop and the coolant circulation loop, so as to effectively ensure the stability of the cooling process. If the outdoor temperature is greater than or equal to the preset outdoor temperature, it is indicated that the combined air-conditioning system is operating in a high-temperature environment, and at this time, a risk of too high pressure may be encountered, so that further judgment needs to be performed on the operating condition of the combined air-conditioning system, so that a more comprehensive and accurate analysis result is formed in a step-by-step judgment manner, the safe operation of the compressor 11 is better protected, and the reliability of the whole air-conditioning system is effectively improved.
Further, in step S107, the controller may further compare the liquid inlet temperature of the coolant circulation loop obtained by the liquid inlet temperature sensor 103 with the first preset liquid inlet temperature, so as to further determine whether the coolant circulation loop has a problem of an excessively high load, and further effectively determine a risk index that the coolant circulation loop has an excessively high pressure. Based on the judgment result of the step S107, if the feed liquid temperature of the secondary refrigerant circulation loop is less than the first preset feed liquid temperature, that is, the feed liquid temperature of the secondary refrigerant circulation loop is greater than the target feed liquid temperature and less than the first preset feed liquid temperature, it is determined that the load of the secondary refrigerant circulation loop is not too high, and in this case, the step S106 is performed, that is, the secondary refrigerant circulation loop is not communicated with the ground cooling branch, and only the air conditioning system is required to perform refrigeration operation in a heat exchange manner between the secondary refrigerant circulation loop and the secondary refrigerant circulation loop, so as to effectively ensure the stability of the refrigeration process. If the liquid inlet temperature of the secondary refrigerant circulation loop is greater than or equal to the first preset liquid inlet temperature, the load of the secondary refrigerant circulation loop is really high, and the risk that the high-pressure of the secondary refrigerant circulation loop is too high is extremely high; in this case, step S108 is performed, that is, the controller directly obtains the high pressure of the refrigerant circulation circuit to perform the determination during the cooling operation of the combined air conditioning system. It should be noted that, the present invention does not limit the specific value of the first preset inlet liquid temperature at all, and the skilled person can set the value according to the actual situation.
As a preferable setting mode of the first preset inlet liquid temperature, the first preset inlet liquid temperature is determined by both the condensing temperature corresponding to the high pressure of the refrigerant circulation loop and the outdoor temperature, so as to ensure the reliability of the judgment result to the maximum extent. Specifically, the first preset inlet liquid temperature is calculated by the following equation:
T1＝(Tcold－TOuter cover)*k1+k2
Wherein, T1The first preset feed liquid temperature is measured in units of; t isColdThe unit of the condensation temperature corresponding to the high pressure of the refrigerant circulation loop is; t isOuter coverIs the outdoor temperature in units of; k is a radical of1Is a first correction coefficient, k2Is the second correction coefficient.
In addition, it should be noted that the technician may set the first correction coefficient k according to the actual situation1And a second correction coefficient k2The specific value of (a); preferably, the first correction coefficient k1Equal to 0.8, second correction factor k2Equal to 3.
Next, in step S109, the controller may determine whether the high pressure of the refrigerant circulation circuit is greater than or equal to the preset high pressure; it should be noted that, the specific value of the preset high pressure is not limited by the present invention, and the technical personnel can set the pressure according to the actual conditions of different compressors. In addition, it can be understood by those skilled in the art that, although the embodiment of the present invention is used to determine whether the high pressure of the refrigerant circulation circuit is too high by comparing the obtained high pressure with the preset high pressure, it is obvious that the determination may be performed by other manners, for example, by comparing the ratio of the obtained high pressure to the preset high pressure with a preset ratio, and the skilled person may set the determination according to actual needs. As a preferred embodiment, a time duration determination factor may be added in step S109, for example, a determination condition is adopted to determine whether the duration of the high pressure of the refrigerant circulation circuit being greater than or equal to the preset high pressure reaches a preset time duration, and a technician may set the preset time duration according to actual use requirements.
Based on the determination result of step S109, if the high pressure of the refrigerant circulation circuit is less than the preset high pressure, step S106 is performed. If the high pressure of the refrigerant circulation loop is greater than or equal to the preset high pressure, step S110 is executed, in this case, the controller controls the three valve ports of the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102 to be communicated, so that the refrigerant circulation loop is communicated with the ground cooling branch, the ground cooling branch assists in cooling and accordingly reduces the load of the refrigerant circulation loop, the high pressure of the refrigerant circulation loop is rapidly restored to a normal pressure range, and the combined air conditioning system is effectively guaranteed to continuously and reliably perform cooling operation, so that the cooling requirement of a user is effectively met.
Further, in step S111, after the preset time, the controller obtains the liquid inlet temperature of the coolant circulation loop again; it should be noted that, the specific value of the preset time is not limited by the present invention, and the technical staff can set the time according to the actual use requirement. Next, in step S112, the controller may determine whether the liquid inlet temperature obtained again is less than the second preset liquid inlet temperature, so as to analyze whether there is a risk of the refrigerant circulation loop that the high pressure is too high. It should be noted that, the specific value of the second preset inlet liquid temperature is not limited, and a technician can set the second preset inlet liquid temperature according to actual use requirements as long as the second preset inlet liquid temperature is less than or equal to the first preset inlet liquid temperature.
Based on the judgment result of the step S112, if the liquid inlet temperature obtained again is greater than or equal to the second preset liquid inlet temperature, continuing to return to the step S111 so as to continue to monitor the cutting-off time of the ground cooling branch; and if the liquid inlet temperature obtained again is lower than the second preset liquid inlet temperature, the refrigerant circulation loop can meet the existing refrigeration requirement, and in this case, in order to effectively ensure the stability of the refrigeration process, the controller cuts off the communication relationship between the refrigerant circulation loop and the ground cooling branch by controlling the communication state of the liquid inlet three-way valve 101 and the liquid outlet three-way valve 102.
As a preferred embodiment, in step S112, the controller may further determine a duration that the liquid inlet temperature obtained again is less than the second preset liquid inlet temperature, and execute step S113 when the liquid inlet temperature obtained again is less than the second preset liquid inlet temperature and reaches a second preset duration, so as to effectively improve the accuracy of the determination result; certainly, a technician can set the value of the second preset duration according to actual use requirements.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously 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 (10)
1. The control method of the combined air-conditioning system is characterized in that the combined air-conditioning system comprises a refrigerant circulation loop, a ground cold branch and a secondary refrigerant circulation loop, wherein secondary refrigerant in the secondary refrigerant circulation loop can exchange heat with refrigerant in the refrigerant circulation loop, and the secondary refrigerant circulation loop can be selectively communicated with the ground cold branch so that the secondary refrigerant flows through the ground cold branch in the circulation process to be cooled through an underground cold source;
the control method comprises the following steps:
acquiring the outdoor temperature and the liquid inlet temperature of the secondary refrigerant circulation loop;
if the liquid inlet temperature of the secondary refrigerant circulation loop is higher than the target liquid inlet temperature, the combined air-conditioning system performs refrigeration operation in a heat exchange mode of the secondary refrigerant circulation loop and the secondary refrigerant circulation loop;
if the outdoor temperature is greater than or equal to the preset outdoor temperature, further comparing the liquid inlet temperature of the secondary refrigerant circulation loop with a first preset liquid inlet temperature;
if the liquid inlet temperature of the secondary refrigerant circulation loop is greater than or equal to the first preset liquid inlet temperature, acquiring the high-pressure of the refrigerant circulation loop in the refrigerating operation process of the combined air-conditioning system;
selectively communicating the secondary refrigerant circulation loop with the ground cooling branch according to the high-pressure of the secondary refrigerant circulation loop;
wherein the first preset inlet liquid temperature is greater than the target inlet liquid temperature.
2. The control method as claimed in claim 1, wherein the step of selectively communicating the coolant circulation circuit with the ground cooling branch circuit according to the high pressure of the coolant circulation circuit comprises:
and if the high pressure of the refrigerant circulation loop is greater than or equal to the preset high pressure, communicating the secondary refrigerant circulation loop with the ground cooling branch.
3. The control method according to claim 2, characterized by further comprising:
and determining the first preset liquid inlet temperature according to the condensing temperature corresponding to the high pressure of the refrigerant circulation loop and the outdoor temperature.
4. The control method as claimed in claim 3, wherein the step of determining the first predetermined inlet temperature according to the condensing temperature corresponding to the high pressure of the refrigerant circulation loop and the outdoor temperature is to calculate the first predetermined inlet temperature by the following equation:
T1＝(Tcold－TOuter cover)*k1+k2
Wherein, T1Is the first predetermined inlet temperature, TColdA condensing temperature, T, corresponding to a high pressure of the refrigerant circulation circuitOuter coverIs the outdoor temperature, k1Is a first correction coefficient, k2Is the second correction coefficient.
5. Control method according to claim 4, characterized in that the first correction factor k1Equal to 0.8 and/or a second correction factor k2Equal to 3.
6. The control method as claimed in claim 2, wherein the step of selectively communicating the coolant circulation circuit with the ground cooling branch according to the high pressure of the coolant circulation circuit further comprises:
and if the high-pressure of the refrigerant circulation loop is less than the preset high-pressure, the secondary refrigerant circulation loop is not communicated with the ground cooling branch.
7. The method as set forth in claim 1, wherein the step of operating the combined air conditioning system in a cooling mode in which the coolant loop exchanges heat with the coolant loop if the inlet temperature of the coolant loop is greater than the target inlet temperature further comprises:
and if the duration time that the liquid inlet temperature of the secondary refrigerant circulation loop is greater than the target liquid inlet temperature reaches a first preset time, enabling the combined air-conditioning system to carry out refrigeration operation in a heat exchange mode between the secondary refrigerant circulation loop and the refrigerant circulation loop.
8. The control method according to claim 7, characterized by further comprising:
and determining the first preset time according to the magnitude relation between the outdoor temperature and the preset outdoor temperature.
9. The control method according to any one of claims 1 to 8, further comprising, after the step of placing the coolant circulation circuit in communication with the ground cooling branch:
after a preset time, obtaining the liquid inlet temperature of the secondary refrigerant circulation loop again;
if the liquid inlet temperature obtained again is lower than a second preset liquid inlet temperature, cutting off the communication relation between the refrigerating medium circulation loop and the ground cooling branch;
and the second preset liquid inlet temperature is less than or equal to the first preset liquid inlet temperature.
10. The control method according to claim 9, wherein the step of cutting off the communication between the coolant circulation circuit and the ground cooling branch if the reacquired feed liquid temperature is less than a second preset feed liquid temperature further comprises:
and if the duration time that the liquid inlet temperature obtained again is less than the second preset liquid inlet temperature reaches a second preset duration, cutting off the communication relation between the secondary refrigerant circulation loop and the ground cooling branch.
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| CN202011196734.3A CN112303827B (en) | 2020-10-30 | 2020-10-30 | Control method of combined air-conditioning system |
| PCT/CN2021/099549 WO2022068257A1 (en) | 2020-10-30 | 2021-06-11 | Control method for combined air conditioning system |
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| CN202011196734.3A CN112303827B (en) | 2020-10-30 | 2020-10-30 | Control method of combined air-conditioning system |
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| CN112303827B (en) * | 2020-10-30 | 2022-05-20 | 青岛海尔空调电子有限公司 | Control method of combined air-conditioning system |
| CN115962554A (en) * | 2022-12-20 | 2023-04-14 | 珠海格力电器股份有限公司 | Fluorine pump refrigerating system, control method and device thereof, and storage medium |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006084149A (en) * | 2004-09-17 | 2006-03-30 | Asahi Kasei Homes Kk | Heating-cooling system using underground heat |
| CN101418971A (en) * | 2008-11-28 | 2009-04-29 | 巢民强 | Composite multi-source central air-conditioning machine set using geothermal energy |
| JP2010048527A (en) * | 2008-08-25 | 2010-03-04 | Masahiro Izutsu | Heat pump type air conditioning system, heat pump type hot water supply system, and integrated system of heat pump type air conditioning-hot water supply |
| JP2010216783A (en) * | 2009-03-19 | 2010-09-30 | Toshiba Carrier Corp | Air conditioning system |
| CN102679484A (en) * | 2012-05-31 | 2012-09-19 | 东南大学 | Water loop heat pump air conditioning system with geothermal energy as single auxiliary cold and heat source |
| CN202648229U (en) * | 2012-05-25 | 2013-01-02 | 泰豪科技股份有限公司 | Energy-saving type air-cooling water chilling unit |
| CN103090592A (en) * | 2013-01-21 | 2013-05-08 | 深圳市庄合地能产业科技有限公司 | Cold and hot external balancer set |
| CN103900178A (en) * | 2014-03-24 | 2014-07-02 | 深圳达实智能股份有限公司 | Ground source heat pump energy storage central air-conditioning system |
| CN203824152U (en) * | 2014-03-28 | 2014-09-10 | 山东中瑞新能源科技有限公司 | Ground-source heat pump system coupled with passive type space radiation refrigeration |
| CN106885348A (en) * | 2017-04-13 | 2017-06-23 | 青岛海尔空调器有限总公司 | A kind of air-conditioner and control method |
| CN111578467A (en) * | 2020-05-12 | 2020-08-25 | 广东美的制冷设备有限公司 | Control method of air conditioning system and air conditioning system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100062405A (en) * | 2008-12-02 | 2010-06-10 | 삼성전자주식회사 | Air conditioner and control method thereof |
| CN201368551Y (en) * | 2009-02-13 | 2009-12-23 | 上海华电源牌环境工程有限公司 | Air conditioner for combining ground source heat pump and ice-storage system |
| JP2012137290A (en) * | 2012-04-08 | 2012-07-19 | Masahiro Izutsu | Integrated utilization system of household wastewater |
| CN204063300U (en) * | 2014-08-14 | 2014-12-31 | 铁道第三勘察设计院集团有限公司 | A kind of soil composite type variable refrigerant flow aircondition |
| CN204880484U (en) * | 2015-08-05 | 2015-12-16 | 黄国和 | Steam ability and sewage source coupling air conditioning system |
| CN112303827B (en) * | 2020-10-30 | 2022-05-20 | 青岛海尔空调电子有限公司 | Control method of combined air-conditioning system |
-
2020
- 2020-10-30 CN CN202011196734.3A patent/CN112303827B/en active Active
-
2021
- 2021-06-11 WO PCT/CN2021/099549 patent/WO2022068257A1/en active Application Filing
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006084149A (en) * | 2004-09-17 | 2006-03-30 | Asahi Kasei Homes Kk | Heating-cooling system using underground heat |
| JP2010048527A (en) * | 2008-08-25 | 2010-03-04 | Masahiro Izutsu | Heat pump type air conditioning system, heat pump type hot water supply system, and integrated system of heat pump type air conditioning-hot water supply |
| CN101418971A (en) * | 2008-11-28 | 2009-04-29 | 巢民强 | Composite multi-source central air-conditioning machine set using geothermal energy |
| JP2010216783A (en) * | 2009-03-19 | 2010-09-30 | Toshiba Carrier Corp | Air conditioning system |
| CN202648229U (en) * | 2012-05-25 | 2013-01-02 | 泰豪科技股份有限公司 | Energy-saving type air-cooling water chilling unit |
| CN102679484A (en) * | 2012-05-31 | 2012-09-19 | 东南大学 | Water loop heat pump air conditioning system with geothermal energy as single auxiliary cold and heat source |
| CN103090592A (en) * | 2013-01-21 | 2013-05-08 | 深圳市庄合地能产业科技有限公司 | Cold and hot external balancer set |
| CN103900178A (en) * | 2014-03-24 | 2014-07-02 | 深圳达实智能股份有限公司 | Ground source heat pump energy storage central air-conditioning system |
| CN203824152U (en) * | 2014-03-28 | 2014-09-10 | 山东中瑞新能源科技有限公司 | Ground-source heat pump system coupled with passive type space radiation refrigeration |
| CN106885348A (en) * | 2017-04-13 | 2017-06-23 | 青岛海尔空调器有限总公司 | A kind of air-conditioner and control method |
| CN111578467A (en) * | 2020-05-12 | 2020-08-25 | 广东美的制冷设备有限公司 | Control method of air conditioning system and air conditioning system |
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| CN112303827A (en) | 2021-02-02 |
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