CN115854440B - Air conditioning unit and control method thereof - Google Patents
Air conditioning unit and control method thereof Download PDFInfo
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- CN115854440B CN115854440B CN202211313984.XA CN202211313984A CN115854440B CN 115854440 B CN115854440 B CN 115854440B CN 202211313984 A CN202211313984 A CN 202211313984A CN 115854440 B CN115854440 B CN 115854440B
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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
本发明涉及水冷空调技术领域，具体提供一种空调机组及其控制方法。旨在解决现有空调机组的控制方式没有基于不同机组的水量进行相应修正而导致控制非最优化的问题。为此，本发明的空调机组包括冷媒循环回路和水循环回路，冷媒循环回路上依次设置有蒸发器、压缩机、冷凝器和节流构件，水循环回路设置成能够与蒸发器和冷凝器中的至少一个进行换热，本发明的控制方法包括：在空调机组的调试阶段，获取水循环回路中的循环水量，基于预设响应速度，根据水循环回路中的循环水量和预设循环水量的比较结果确定空调机组的响应速度；其中，预设循环水量和预设响应速度为具有对应关系的存储值，进而有效提升空调机组的控制稳定性。
The present invention relates to the technical field of water-cooled air conditioners, and specifically provides an air conditioning unit and a control method thereof. The purpose is to solve the problem that the control method of the existing air conditioning unit does not make corresponding corrections based on the water volume of different units, resulting in non-optimal control. To this end, the air conditioning unit of the present invention includes a refrigerant circulation loop and a water circulation loop, and the refrigerant circulation loop is sequentially provided with an evaporator, a compressor, a condenser and a throttling component, and the water circulation loop is configured to be able to exchange heat with at least one of the evaporator and the condenser. The control method of the present invention includes: in the debugging stage of the air conditioning unit, the amount of circulating water in the water circulation loop is obtained, and based on a preset response speed, the response speed of the air conditioning unit is determined according to the comparison result of the circulating water volume in the water circulation loop and the preset circulating water volume; wherein the preset circulating water volume and the preset response speed are storage values with a corresponding relationship, thereby effectively improving the control stability of the air conditioning unit.
Description
Technical Field
The invention relates to the technical field of water-cooling air conditioners, and particularly provides an air conditioning unit and a control method thereof.
Background
With the continuous development of air conditioning technology, air conditioning types for different application scenes are generated, and for large-scale heat exchange places, the heat exchange requirements of users are difficult to meet by common air-cooled air conditioners, so that water-cooled air conditioners are widely applied. The water-cooling air conditioner takes the refrigerant circulation system as the center to control the host machine, which is controllable, reliable and reliable, and in the host machine control process of the water-cooling air conditioner, the control information of the air disc is not collected, but the control requirement can be met, because the water circulation system has enough heat capacity to meet the control of water inlet and outlet temperatures. Engineering, minimum limit (start-up process allowed), maximum limit (condenser and line pressure limit). Specifically, since the host test before delivery is performed based on a certain water volume set in the water circulation system, in the actual application process, the field installation water volumes of different application scenes are uncertain, the set water volumes may be the same as the water volumes in the test, but most scenes are different from the water volumes in the test, and in this case, the control mode in the test is not enough, and the problem of insufficient control utilization is unavoidable.
Accordingly, there is a need in the art for a new air conditioning unit and a control method thereof to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to solve the technical problems that the control mode of the existing air conditioning unit is not correspondingly corrected based on the water quantity of different units, so that the control is not optimized.
In a first aspect, the present invention provides a control method of an air conditioning unit including a refrigerant circulation circuit having an evaporator, a compressor, a condenser, and a throttle member sequentially disposed thereon, and a water circulation circuit disposed to be capable of exchanging heat with at least one of the evaporator and the condenser,
The control method comprises the following steps:
in the debugging stage of the air conditioning unit, acquiring the circulating water quantity in the water circulation loop;
comparing the circulating water quantity in the water circulating loop with a preset circulating water quantity;
Based on a preset response speed, determining the response speed of the air conditioning unit according to a comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity;
the preset circulating water quantity and the preset response speed are stored values with corresponding relations.
In the above preferred technical solution of the control method of an air conditioning unit, the step of determining the response speed of the air conditioning unit based on the preset response speed according to the comparison result of the circulating water amount in the water circulation loop and the preset circulating water amount specifically includes:
and determining the response speed of the air conditioning unit according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity based on the preset response speed.
In the preferred technical solution of the control method of an air conditioning unit, the step of determining the response speed of the air conditioning unit based on the preset response speed according to the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume, wherein the preset response speed is set based on the time variation, specifically includes:
and determining the response speed of the air conditioning unit changing along with time according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity based on the preset response speed set by the preset time variation.
In the preferred technical solution of the control method of an air conditioning unit, the step of determining the response speed of the air conditioning unit based on the preset response speed according to the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume specifically includes:
and determining the response speed of the air conditioning unit along with the change of the amplitude according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity based on the preset response speed set by the change of the preset parameter.
In a preferred embodiment of the control method of an air conditioning unit, the water circulation circuit is a chilled water circulation circuit, and the chilled water circulation circuit is configured to exchange heat with the evaporator.
In the above preferred technical solution of the control method of an air conditioning unit, the step of determining the response speed of the air conditioning unit based on the preset response speed according to the comparison result of the circulating water amount in the water circulation loop and the preset circulating water amount further includes:
and determining the response speed of the refrigerant circulation loop according to the comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity based on the preset response speed.
In a preferred embodiment of the control method of an air conditioning unit, the water circulation loop is a cooling water circulation loop, and the cooling water circulation loop is configured to exchange heat with the condenser.
In the above preferred technical solution of the control method of an air conditioning unit, the step of determining the response speed of the air conditioning unit based on the preset response speed according to the comparison result of the circulating water amount in the water circulation loop and the preset circulating water amount further includes:
and determining the response speed of the cooling water circulation loop according to the comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity based on the preset response speed.
In the preferred technical solution of the control method of an air conditioning unit, the cooling water circulation loop is provided with a cooling water circulation pump, and a cooling fan is disposed near the cooling water circulation loop, and the step of determining the response speed of the cooling water circulation loop based on the preset response speed according to the comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity specifically includes:
And determining the response speed of the cooling water circulating pump and/or the cooling fan according to the comparison result of the circulating water quantity in the water circulating loop and the preset circulating water quantity based on the preset response speed.
In a second aspect, the present invention also provides an air conditioning unit comprising a controller capable of executing the control method described in any one of the above preferred technical solutions.
Under the condition that the technical scheme is adopted, the air conditioning unit comprises a refrigerant circulation loop and a water circulation loop, wherein an evaporator, a compressor, a condenser and a throttling component are sequentially arranged on the refrigerant circulation loop, the water circulation loop is arranged to be capable of exchanging heat with at least one of the evaporator and the condenser, the control method comprises the steps of obtaining circulating water quantity in the water circulation loop in a debugging stage of the air conditioning unit, comparing the circulating water quantity in the water circulation loop with preset circulating water quantity, and determining response speed of the air conditioning unit according to a comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity based on the preset response speed, wherein the preset circulating water quantity and the preset response speed are storage values with corresponding relations. Based on the control mode, the air conditioning unit can correspondingly adjust the response speed based on different circulating water amounts, so that the running parameters set in the debugging stage can be adaptively applied to different units after adjustment, based on the control mode, the air conditioning unit can provide a faster decision to ensure the response speed of a host, and can also better realize the energy-saving control of a compressor, thereby realizing minimized protection and further effectively improving the control stability of the air conditioning unit.
Further preferably, the invention can determine the response speed of the air conditioning unit according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity based on the preset response speed, and the correction process can be more quantitatively processed based on the introduction of the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity, so that the correction effect is effectively improved, and the purpose of improving the control stability is effectively achieved.
Still further preferably, the preset response speed is set based on a time variation, so that the preset response speed set based on the preset time variation can be determined according to a ratio of the circulating water volume in the water circulation loop to the preset circulating water volume, so that the running mode of the air conditioning unit can be effectively corrected from a time variation dimension, and the control stability of the air conditioning unit can be improved.
Still further preferably, the preset response speed is set based on a parameter variation range, so that the preset response speed set based on the preset parameter variation range can be determined according to the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume, and the response speed of the air conditioning unit along with the variation of the amplitude is determined, so that the operation mode of the air conditioning unit is effectively corrected from the dimension of the variation of the amplitude, and the control stability of the air conditioning unit is improved.
In addition, it is further preferable that the water circulation loop is a chilled water circulation loop, the chilled water circulation loop is configured to exchange heat with the evaporator, and the control method of the invention can determine the response speed of the refrigerant circulation loop according to the comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity based on the preset response speed, so as to effectively ensure the indoor heat supply requirement, and further ensure the heat exchange experience of a user to the greatest extent.
In addition, it is further preferable that the water circulation loop in the present invention is a cooling water circulation loop, and the cooling water circulation loop is configured to exchange heat with the condenser, and the control method in the present invention is capable of determining the response speed of the cooling water circulation loop according to the comparison result of the circulating water amount in the water circulation loop and the preset circulating water amount based on the preset response speed, so as to effectively ensure that the cooling water circulation loop can help the refrigerant circulation loop to perform better heat dissipation, thereby further improving the control stability of the unit.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a refrigerant circulation circuit of an air conditioning unit according to the present invention;
FIG. 2 is a schematic diagram of a chilled water loop of an air conditioning unit according to the present invention;
FIG. 3 is a logic diagram of a control method of the present invention;
FIG. 4 is a flow chart of the main steps of the control method of the present invention;
reference numerals:
11. Refrigerant circulation loop, 111, evaporator, 112, compressor, 113, condenser, 114, throttle component;
12. The system comprises a chilled water circulation loop, 121, a fan disc, 122, a chilled water circulation pump, 123, a chilled water outlet temperature sensor, 124, a chilled water return temperature sensor, 125, a target flow switch;
13. and a cooling water circulation loop.
Detailed Description
Various 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 merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. For example, the air conditioning unit of the present invention may be used in both malls and industrial production. Such changes as to the application object do not deviate from the basic principle of the invention and fall within the protection scope of the invention.
In the description of the preferred embodiment, unless explicitly stated or limited otherwise, the terms "connected," "connected," and the like should be construed broadly, and may be, for example, directly connected, indirectly connected through an intermediary, or internally connected between two elements, and therefore should not be construed as limiting the invention.
Furthermore, it should be noted that in the description of the present application, although the respective steps of the control method of the present application are described in a specific order in the present application, these orders are not limitative, but a person skilled in the art may perform the steps in a different order without departing from the basic principle of the present application.
Referring first to fig. 1, a schematic diagram of a refrigerant circulation circuit of an air conditioning unit according to the present invention is shown. As shown in fig. 1, the air conditioning unit of the present invention includes a refrigerant circulation circuit 11, and an evaporator 111, a compressor 112, a condenser 113 and a throttling member 114 sequentially disposed on the refrigerant circulation circuit 11, it is understood that other heat exchange members may be disposed on the refrigerant circulation circuit 11, which is not limited, and those skilled in the art may select the types of the evaporator 111, the compressor 112, the condenser 113 and the throttling member 114 according to actual use requirements, for example, the throttling member 114 may be an electronic expansion valve or a capillary tube. The refrigerant in the refrigerant circulation loop 11 is continuously subjected to gas-liquid conversion between the evaporator 111 and the condenser 113 to realize heat exchange, and the control of the refrigerant circulation loop 11 can be realized by controlling the compressor 112 and the throttling member 114 in the unit operation process. It should be noted that the specific structure of the refrigerant circulation circuit 11 is not limited in the present invention, and those skilled in the art can set the refrigerant circulation circuit according to the actual use requirements.
Further, the air conditioning unit of the present invention further includes a chilled water circulation loop 12 and a cooling water circulation loop 13, wherein the chilled water circulation loop 12 is provided to be capable of exchanging heat with the evaporator 111, and the cooling water circulation loop 13 is provided to be capable of exchanging heat with the condenser 113. It should be noted that, although the water circulation circuit in the preferred embodiment includes both the chilled water circulation circuit 12 and the cooling water circulation circuit 13, the water circulation circuit may obviously also include only one of the chilled water circulation circuit 12 and the cooling water circulation circuit 13, and the specific structure of the chilled water circulation circuit 12 and the cooling water circulation circuit 13, the specific heat exchange manner of the chilled water circulation circuit 12 and the evaporator 111, and the specific heat exchange manner of the cooling water circulation circuit 13 and the condenser 113 are not limited in the present invention, and may be set by one skilled in the art according to the actual use requirements.
Referring next to fig. 2, a schematic diagram of a chilled water loop of an air conditioning unit according to the present invention is shown. As shown in fig. 2, a plurality of air disks 121 are disposed near the chilled water circulation loop 12 of the present invention to perform heat exchange better, however, the present invention does not limit the number of specific air disks 121, and those skilled in the art can set the number of air disks 121 according to the actual use requirement, and the plurality of air disks 121 can be disposed in different spaces or in the same space, and the present invention is not limited thereto. The chilled water circulation loop 12 is further provided with a chilled water circulation pump 122 and a target flow switch 125 for ensuring normal circulation of chilled water, and of course, the invention does not limit the setting positions of the chilled water circulation pump 122 and the target flow switch 125, and a person skilled in the art can set the setting positions according to actual use requirements. In addition, the chilled water circulation loop 12 is further provided with a chilled water outlet temperature sensor 123 and a chilled water return water temperature sensor 124, and the chilled water outlet temperature sensor 123 and the chilled water return water temperature sensor 124 are respectively disposed at two ends of the evaporator 111, so as to more accurately measure the outlet water temperature and the return water temperature. It should be noted that, the specific types, setting positions and setting numbers of the chilled water circulation pump 122, the chilled water outlet water temperature sensor 123, the chilled water return water temperature sensor 124 and the target flow switch 125 are not limited in the present invention, and can be set by a person skilled in the art according to actual use requirements.
The cooling water circulation circuit 13 is similar to the chilled water circulation circuit 12 except that a fan is not generally provided, and thus will not be described here.
In addition, the air conditioning unit further includes a controller capable of acquiring detection information of each sensor and also capable of controlling the operation of the air conditioning unit, for example, the operation frequency of the compressor 112, the opening degree of the throttle member 114, and the like, which are not limitative. It will 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 an original controller of the air conditioning unit or a controller separately provided for executing the control method of the present invention, and those skilled in the art may set the structure and model of the controller according to actual use requirements.
Referring next to fig. 3, a logic relationship diagram of the control method of the present invention is shown. As shown in fig. 3, for the control of the water-cooled air conditioning unit, the target outlet water temperature Ts of the chilled water circulation loop 12 is usually set first, then the heat exchange capacity of the refrigerant circulation loop 11 (for example, by adjusting the power of the compressor 112 or the opening of the throttling member 114) is correspondingly controlled, the control of the refrigerant system is realized through the conversion of the control command, based on the control of the refrigerant system, the refrigerant system generates corresponding heat, the generated heat generated by the refrigerant system is transferred to the water circulation loop, a part of the heat is necessarily leaked in the transfer process, that is, the part which is not transferred to the water circulation loop and is lost, and the temperature of the water after heat exchange, that is, the outlet water temperature of the chilled water, is output after the heat exchange, thereby realizing the heat exchange.
Based on the control logic, a system operation formula may be derived based on parameters involved in the control logic:
Wherein T i is the water outlet temperature of the water circulation loop, T is time, C P is the specific heat of the circulating water, M A is the mass of the circulating water, Q W is the generated heat of a refrigerant system, Q L is the leakage heat in the heat exchange process, k is a correction system, and T o is the external temperature.
Based on the above formula, when the quality of the circulating water becomes variable, the generated heat of the refrigerant system is correspondingly changed in order to ensure the heat exchange effect of the unit. In other words, the amount of water required for each air conditioning unit is uncertain based on different installation sites, and the existing control methods do not consider corresponding configuration based on different amounts of water, so that the problem of insufficient control utilization is easily caused by using the control methods tested before leaving the factory.
Based on the above, the control method of the invention considers that the quality M A of the circulating water is set as a constant parameter to be substituted into the control scheme, so that the constant parameter M A is correspondingly regulated based on the installation configuration of different scenes, thereby optimizing the control logic to the greatest extent and improving the control stability.
In particular, reference is made to fig. 4, which is a flow chart of the main steps of the control method of the present invention. As shown in fig. 4, based on the air conditioning unit described in the above embodiment, the control method of the present invention mainly includes the following steps:
s1, acquiring the circulating water quantity in a water circulation loop in a debugging stage of an air conditioning unit;
s2, comparing the circulating water quantity in the water circulating loop with a preset circulating water quantity;
and S3, based on the preset response speed, determining the response speed of the air conditioning unit according to a comparison result of the circulating water quantity in the water circulation loop and the preset circulating water quantity.
Further, in step S1, in the commissioning phase of the air conditioning unit, it is understood that the commissioning phase herein refers to a commissioning phase in which the air conditioning unit has been installed on site but is not formally used, and is not a commissioning phase before shipping. The amount of circulating water in the water circulation circuit is obtained, and the water circulation circuit can be either the chilled water circulation circuit 12 or the cooling water circulation circuit 13, so long as corresponding control is performed later. In addition, it should be noted that the present invention does not limit the specific way of obtaining the circulating water amount in the water circulation loop, and those skilled in the art can set the water circulation loop according to the actual use requirement, so long as the actual circulating water amount can be obtained.
Further, in step S2, the circulating water amount in the water circulation loop is compared with the preset circulating water amount, and it is understood that the preset circulating water amount is the circulating water amount used when the air conditioning unit is tested before leaving the factory. As a preferred arrangement, the specific way of comparing the circulating water volume in the water circulation loop with the preset circulating water volume is to compare the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume, so that corresponding control can be performed in the subsequent step based on the ratio. Of course, it should be further noted that the present invention does not limit the specific comparison between the circulating water amount in the water circulation loop and the preset circulating water amount, and those skilled in the art can set the water circulation loop according to the actual use requirement.
Finally, in step S3, based on a preset response speed, the response speed of the air conditioning unit is determined according to a comparison result of the circulating water volume in the water circulation loop and the preset circulating water volume. It can be understood that the preset circulating water amount and the preset response speed are storage values with corresponding relation, specifically, before the air conditioning unit leaves the factory, technicians can perform corresponding tests on the operation logic stored in the air conditioning unit, and after continuous tests and self-learning, the optimal operation logic can be made to achieve good control stability, and of course, the invention does not limit the process, in the testing process before delivery, the water quantity in the water circulation loop configured by the air conditioning unit is fixed, the water quantity is the preset circulating water quantity, based on the circulating water quantity, the technician also sets the optimal response speed of the air conditioning unit corresponding to the water quantity, and the optimal response speed tested before delivery is the preset corresponding speed in the step.
Based on the preferred setting mode corresponding to the step S2, the preferred setting mode corresponding to the step S3 is to determine the response speed of the air conditioning unit according to the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume based on the preset response speed, that is, to set the response speed of the air conditioning unit and the preset response speed in corresponding equal proportion based on the ratio of the circulating water volume in the water circulation loop to the preset circulating water volume. It should be noted that, the specific parameter types corresponding to the response speed in the preferred embodiment are not limited in the present invention, and those skilled in the art can set the parameter types according to the actual use requirements.
And selecting dimensions based on the parameter types, setting the preset response speed based on the time variation, setting the preset response speed based on the preset time variation, and determining the response speed of the air conditioning unit along with the time variation according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity. Specifically, when the time variation is accumulated to a preset value, for example, before a factory test, the preset circulating water amount is 5 cubic and the corresponding preset response speed of the compressor 112 is 10 cubic, if the circulating water amount of the water circulation loop in the actual application scene is 10 cubic, the response speed of the air conditioning unit is finally determined to be the response speed of the compressor 112 once every 5 seconds. Of course, this is merely exemplary, and a person skilled in the art may set the type of parameter corresponding to the response speed of the air conditioning unit and the response speed thereof according to the actual use requirement, for example, the response speed of the air conditioning unit may also correspond to the time interval during which the throttle member 114 performs the opening adjustment each time.
And selecting a dimension based on the parameter type, setting the preset response speed based on the parameter variation amplitude, setting the preset response speed based on the preset parameter variation amplitude, and determining the response speed of the air conditioning unit along with the variation of amplitude according to the ratio of the circulating water quantity in the water circulation loop to the preset circulating water quantity. Specifically, when the parameter variation range is accumulated to a preset value, for example, before a factory test, the preset circulating water amount is 5 cubic and the corresponding preset response speed of the compressor 112 is 10W for each consumption, if the circulating water amount of the water circulation loop in the actual application scene is 10 cubic, the finally determined response speed of the air conditioning unit corresponds to the response speed of the compressor 112 being 5W for each consumption. Of course, this is merely exemplary, and a person skilled in the art may set the type of parameter corresponding to the response speed of the air conditioning unit and the response speed thereof according to the actual use requirement.
Based on the dimension selected by the actuator, as a preferred embodiment, in the case that the water circulation loop is the chilled water circulation loop 12, based on the preset response speed, the response speed of the refrigerant circulation loop is determined according to a comparison result of the circulation water amount in the chilled water circulation loop 12 and the preset circulation water amount. In other words, when the control method of the present invention is applied to the chilled water circulation loop 12, the final corresponding actuator is the actuator disposed in the refrigerant circulation loop, for example, the response speed of the compressor 112, and for example, the response speed of the throttling member 114, which is not limited, and can be set by a person skilled in the art according to the actual use requirement.
Based on the selected dimension of the actuator, as another preferred embodiment, in the case where the water circulation circuit is the cooling water circulation circuit 13, based on the preset response speed, the response speed of the cooling water circulation circuit is determined according to a comparison result of the circulation water amount in the cooling water circulation circuit 13 and the preset circulation water amount. In other words, when the control method of the present invention is applied to the cooling water circulation loop 13, the final corresponding actuator is an actuator disposed in the cooling water circulation loop 13, for example, a response speed of a cooling water circulation pump, and, for example, a response speed of a cooling fan, which is not limited, and can be set by a person skilled in the art according to actual use requirements.
Thus far, the technical solution of the present invention has 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 protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
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| CN1793746A (en) * | 2005-12-31 | 2006-06-28 | 东莞市广大制冷有限公司 | Automatic adjustment and control method of cooling water and chilled water flow in central air-conditioning system |
| HK1086984A2 (en) * | 2006-02-23 | 2006-09-29 | Man Chu Lau David | An industrial process efficiency method and system |
| KR101286708B1 (en) * | 2013-05-28 | 2013-07-16 | (주) 우림 | Airconditioner freeze water supply system |
| CN114440493B (en) * | 2021-03-30 | 2024-06-07 | 荏原冷热系统（中国）有限公司 | Coupling unit, control method and control system of coupling unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931031A (en) * | 2018-06-28 | 2018-12-04 | 湖南湖大瑞格能源科技有限公司 | A kind of energy-saving control method and system of depth lake water source heat pump system |
| CN114111023A (en) * | 2020-12-24 | 2022-03-01 | 四川贝园科技有限公司 | Refrigerating and heating double-effect heat exchanger with natural cooling function and control method thereof |
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