Multi-sensor collaborative network architecture and water chilling unit sequence control system

Abstract

The embodiment of the utility model provides a multi-sensor collaborative network architecture and a water chilling unit sequence control system, and belongs to the technical field of sensor data acquisition and processing. The mounting positions of the plurality of sensors comprise positions associated with fault propagation chains of incorrect start and stop of the water chilling unit; the fault propagation chain comprises chilled water supply temperature rise, bypass pipe reverse flow and indoor temperature abnormal rise; and the operation logic module is respectively connected with the plurality of sensors and is used for receiving sensor signals respectively transmitted by the plurality of sensors so as to adaptively adjust a cold load threshold value. By adopting the technical scheme of the invention, the water chilling unit sequence control performance under the cold load measurement deviation can be improved, so that the operation energy efficiency and robustness of the water chilling unit of the system are ensured.

Description

Technical Field

[0001] The present application relates to the field of sensor data acquisition and processing technology, and in particular to a multi-sensor collaborative network architecture and a chiller sequence control system. Background Art

[0002] High-performance chiller sequencing control of multiple chillers in a central air-conditioning chilled water system is crucial to ensuring system robustness and energy efficiency.

[0003] In the related art, the timing control of the chiller is usually performed by comparing the total cooling load measured by the sensor with a preset load threshold to obtain a comparison result, and then determining the number of chillers in operation based on the comparison result.

[0004] However, in actual projects, the temperature and flow sensors installed in the chilled water inlet and outlet circuits often have measurement uncertainties, which can cause a significant deviation between the real-time total cooling load and the actual value, resulting in incorrect opening and closing of the chiller in the chiller timing control, and further causing a serious decline in the operating energy efficiency and robustness of the system chiller. Utility Model Content

[0005] The main purpose of the embodiments of the present application is to propose a multi-sensor collaborative network architecture chiller sequence control system, aiming to improve the performance of chiller sequence control under cooling load measurement deviation, thereby ensuring the operating energy efficiency and robustness of the system chiller.

[0006] To achieve the above objectives, a first aspect of an embodiment of the present application proposes a multi-sensor collaborative network architecture, which is used to adaptively adjust the cooling load threshold to offset the impact of cooling load prediction deviation in chiller sequence control;

[0007] The multi-sensor collaborative network architecture includes:

[0008] Multiple sensors, the installation locations of the multiple sensors including locations associated with a fault propagation chain that could cause incorrect startup and shutdown of the chiller; the fault propagation chain including increased chilled water supply temperature, reverse flow in the bypass pipe, and abnormally increased indoor temperature;

[0009] An operation logic module is connected to the multiple sensors respectively, and is used to receive sensor signals transmitted by the multiple sensors respectively to adaptively adjust the cooling load threshold.

[0010] In some embodiments, the plurality of sensors includes:

[0011] a first temperature sensor, the first temperature sensor being installed at a location where a chilled water main is located, and being used to measure the temperature of chilled water in the chilled water main; the chilled water main is connected to the chiller;

[0012] The second temperature sensor is installed at the end of the fan coil unit and is used to measure the indoor return air temperature; the fan coil unit is connected to the chilled water main.

[0013] In some embodiments, the plurality of sensors further comprises:

[0014] A first flow sensor is installed at the location of the bypass pipe and is used to measure the backflow flow in the bypass pipe; one end of the bypass pipe is connected to the water inlet pipe of the chilled water main pipe, and the other end of the bypass pipe is connected to the water outlet pipe of the chilled water main pipe.

[0015] In some embodiments, the plurality of sensors further comprises:

[0016] A current sensor is installed at the location of the chiller and is used to measure the operating current of the chiller.

[0017] In some embodiments, there are multiple current sensors, and the nth current sensor among the current sensors is installed in the nth chiller among the multiple chillers, and the nth current sensor is used to measure the operating current of the nth chiller; n is an integer greater than or equal to 1.

[0018] In some embodiments, the current sensor is installed in a total power supply circuit of the plurality of chillers to measure a total operating current of the plurality of chillers.

[0019] To achieve the above-mentioned object, a second aspect of an embodiment of the present application proposes a chiller sequence control system based on a multi-sensor collaborative network architecture, wherein the chiller sequence control system based on the multi-sensor collaborative network architecture includes the multi-sensor collaborative network architecture described in the first aspect above;

[0020] The chiller sequence control system also includes a chiller sequence controller, which is connected to the multi-sensor collaborative network architecture and the chiller respectively, and is used to receive the updated cooling load threshold transmitted by the multi-sensor collaborative network architecture to generate a control signal to control the chiller to start or stop operation.

[0021] In some embodiments, the chiller sequence controller is also connected to the first temperature sensor among the multiple sensors of the multi-sensor collaborative network architecture, and is used to receive the temperature of the chilled water at the inlet of the chilled water main measured by the first temperature sensor to generate a control signal to control the chiller to start or stop operation.

[0022] In some embodiments, the chiller sequence control system further comprises:

[0023] a second flow sensor, the second flow sensor being installed at a location where the chilled water main is located, and being used to measure the flow rate of the chilled water at an inlet of the chilled water main;

[0024] The chiller sequence controller is connected to the second flow sensor and is used to receive the flow of chilled water at the inlet of the chilled water main measured by the second flow sensor to generate a control signal to control the chiller to start or stop operation.

[0025] In some embodiments, the chiller sequence control system further comprises:

[0026] a third temperature sensor, installed at the location of the chilled water main pipe, for measuring the temperature of the chilled water at the outlet of the chilled water main pipe;

[0027] The chiller sequence controller is connected to the third temperature sensor and is used to receive the temperature of the chilled water at the chilled water main outlet measured by the third temperature sensor to generate a control signal to control the chiller to start or stop operation.

[0028] The multi-sensor collaborative network architecture and chiller sequence control system proposed in the embodiments of the present application are based on installing multiple sensors in the multi-sensor collaborative network architecture at locations associated with the fault propagation chain of incorrect chiller startup and shutdown. Therefore, based on the fact that the installation locations of multiple sensors in the multi-sensor collaborative network architecture are closely related to the fault propagation chain of incorrect chiller startup and shutdown and work together, these multiple sensors can not only reflect the direction of cooling load deviation when the chiller is turned on and off, but also detect the status of sensors at different locations based on the fault propagation chain to diagnose the level of cooling load deviation. Furthermore, the embodiments of the present application, in conjunction with the operation logic module, adaptively adjust the cooling load threshold based on the information transmitted by the multi-sensor network to offset the impact of cooling load measurement deviation in chiller sequence control.

[0029] In this way, for a central air-conditioning chilled water system where cooling load measurement deviations are widespread, the cooling load threshold correction for starting and stopping the chiller is performed based on the embodiment of the present application, thereby achieving the effect of tolerating cooling load deviations. That is, the embodiment of the present application can improve or even enhance the performance of chiller sequence control in the presence of load measurement deviations, thereby ensuring the operating energy efficiency and robustness of the system chiller. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a multi-sensor collaborative network architecture provided in some embodiments of the present application;

[0031] Figure 2 A schematic diagram of the structure involved in some embodiments of the chiller sequence control system based on a multi-sensor collaborative network architecture provided in the embodiments of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0033] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0035] First, the overall concept of the embodiment of the present application is described.

[0036] Central air conditioning chilled water systems installed in large commercial and office buildings typically utilize multiple chillers to provide cooling load, improving system efficiency during periods of low cooling load. High-performance chiller sequencing is crucial for both system robustness and energy efficiency. Chiller sequencing determines the number of chillers to operate by comparing the measured total cooling load with a preset load threshold.

[0037] In related technologies, sensor deployment architectures install temperature and flow sensors on the inlet and outlet circuits of the chilled water main to calculate the total cooling load. Chiller sequence control then compares this total cooling load with a preset cooling load threshold to determine the number of chillers in operation. The preset cooling load threshold is typically set at the chiller's maximum cooling capacity to improve energy efficiency.

[0038] This simple and direct sensor deployment architecture has been widely used in industry due to its simplicity and practicality.

[0039] However, in real-world projects, temperature and flow sensors installed in the chilled water inlet and outlet circuits often suffer from varying degrees of measurement error, which is difficult to accurately correct. The measurement uncertainty of these sensors can lead to significant deviations between the real-time total cooling load and the actual value, resulting in incorrect startup and shutdown of the chiller, which in turn significantly reduces the chiller's energy efficiency and robustness. Specifically, negative cooling load measurement deviations (cooling load less than the actual cooling load) cause the chiller to start up late and shut down early, leading to insufficient cooling capacity. This can cause problems such as increased chilled water supply temperature, bypass backflow, and abnormally high indoor temperatures, significantly reducing system robustness and indoor comfort. Positive cooling load measurement deviations (cooling load greater than the actual cooling load) can cause the chiller to start up early and shut down late, causing the chiller to operate at low part load for extended periods, significantly reducing chiller energy efficiency.

[0040] In other words, the existence of measurement deviations in the sensor architecture causes the chiller to not start and stop under its preset operating conditions. For example, additional chillers are not started when the operating chiller reaches its maximum cooling capacity, which will lead to a serious decline in the operating energy efficiency and robustness of the system chiller.

[0041] Based on this, considering that the influence of the cooling load measurement deviation can be effectively offset by correcting the preset cooling load threshold, for example, the cooling load threshold is synchronously lowered when the cooling load measurement deviation is negative, and the cooling load threshold is synchronously increased when the cooling load measurement deviation is positive, so as to offset the influence of the cooling load measurement deviation, the embodiment of the present application proposes a multi-sensor collaborative network architecture and a chiller sequence control system based on the multi-sensor collaborative network architecture, which corrects the cooling load threshold under the cooling load measurement deviation from the perspective of sensor hardware deployment, thereby improving the chiller sequence control performance.

[0042] For central air-conditioning chilled water systems where cooling load measurement deviations are widespread, the embodiments of the present application can be used to implement cooling load threshold correction for starting and stopping the chiller, thereby achieving the effect of tolerating cooling load deviations, that is, the chiller sequence control can maintain good performance in the presence of cooling load deviations, thereby ensuring the operating energy efficiency and robustness of the system chiller.

[0043] In an embodiment of the present application, for a central air-conditioning chilled water system with measurement deviations, a multi-sensor collaborative network architecture is constructed to closely associate the incorrect start and stop of the chiller caused by the measurement deviations. For example, the installation positions of the multiple sensors selected in the multi-sensor collaborative network architecture are closely related to the fault propagation chain of incorrect start and stop of the chiller and they work together, which can effectively solve the negative impact of the cooling load measurement deviation on the sequence control of the chiller.

[0044] In some embodiments, the multi-sensor collaborative network architecture proposed in the embodiments of the present application is constructed by using multiple sensors to build a multi-sensor collaborative network. The multiple sensors may include sensors for measuring the chilled water supply temperature, sensors for measuring the current of the chiller, sensors for measuring the bypass pipe flow, and sensors for measuring the indoor return air temperature. The multi-sensor collaborative network architecture proposed in the embodiments of the present application is deployed, and the physical correlation between the information of multiple sensors and the common physical characteristics of the central air-conditioning chilled water system can be utilized to achieve the purpose of tolerating the cooling load measurement deviation to improve the sequence control performance of the chiller.

[0045] In addition, in actual deployment, the multi-sensor collaborative network architecture proposed in the embodiment of the present application can effectively reflect the direction of cooling load measurement deviation by detecting data changes of these sensors during the chiller startup event.

[0046] In some embodiments, in the multi-sensor collaborative network architecture proposed in the embodiments of the present application, sensors at all levels are interconnected and influence each other, so that through the internal association of the multi-sensor network, the diagnosis of the cooling load measurement deviation can be completed from the perspective of the influence propagation chain of the cooling load measurement deviation, and the cooling load threshold can be adaptively corrected to offset the influence of the cooling load measurement deviation.

[0047] Next, based on the overall concept of the above-mentioned embodiments of the present application, specific embodiments of the multi-sensor collaborative network architecture proposed in the embodiments of the present application and the chiller sequence control system based on the multi-sensor collaborative network architecture are proposed, and first, each specific embodiment of the multi-sensor collaborative network architecture proposed in the embodiments of the present application is described in detail.

[0048] It should be noted that in the following description of the multi-sensor collaborative network architecture proposed in the embodiments of the present application and the specific embodiments of the system, it should be understood that the description of orientation, such as the orientation or position relationship indicated by up, down, etc., is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, in the following description, "a plurality" refers to more than two. The use of "first" or "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features. Furthermore, in the following description, unless otherwise expressly defined, terms such as "set," "install," and "connect" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in this application based on the specific content of the technical solution.

[0050] The multi-sensor collaborative network architecture provided in the embodiment of the present application is used to adaptively adjust the cooling load threshold to offset the impact of cooling load prediction deviation in chiller sequence control.

[0051] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the multi-sensor collaborative network architecture provided in some embodiments of the present application.

[0052] In some embodiments, as Figure 1 As shown, the multi-sensor collaborative network architecture provided by the embodiment of the present application may include:

[0053] Multiple sensors, the installation locations of the multiple sensors including locations associated with a fault propagation chain that could cause incorrect startup and shutdown of the chiller; the fault propagation chain including increased chilled water supply temperature, reverse flow in the bypass pipe, and abnormally increased indoor temperature;

[0054] An operation logic module is connected to the multiple sensors respectively, and is used to receive sensor signals transmitted by the multiple sensors respectively to adaptively adjust the cooling load threshold.

[0055] In an embodiment of the present application, a multi-sensor collaborative network architecture may include at least multiple sensors and an operational logic module. The multiple sensors are installed at locations associated with a fault propagation chain that could lead to improper chiller startup and shutdown. This fault propagation chain includes elevated chilled water supply temperature, reverse flow in the bypass pipe, and abnormally elevated indoor temperature. The operational logic module is connected to each of the multiple sensors and is configured to receive sensor signals transmitted by each of the sensors to adaptively adjust the cooling load threshold.

[0056] In this way, by installing multiple sensors in a multi-sensor collaborative network architecture at locations associated with the fault propagation chain of incorrect chiller startup and shutdown, and by closely linking their installation locations with the fault propagation chain of incorrect chiller startup and shutdown, and by working in tandem, these sensors can not only reflect the direction of cooling load deviation when the chiller is turned on and off, but also diagnose the level of cooling load deviation by detecting the status of sensors at different locations along the fault propagation chain. Furthermore, the operational logic module, in conjunction with the information transmitted by the multi-sensor network, adaptively adjusts the cooling load threshold to offset the impact of cooling load measurement deviation in chiller sequence control.

[0057] In this way, for a central air-conditioning chilled water system where cooling load measurement deviations are widespread, the cooling load threshold correction for starting and stopping the chiller is performed based on the embodiment of the present application, thereby achieving the effect of tolerating cooling load deviations. That is, the embodiment of the present application can improve or even enhance the performance of chiller sequence control in the presence of load measurement deviations, thereby ensuring the operating energy efficiency and robustness of the system chiller.

[0058] It's important to note that negative cooling load measurement deviation (measured cooling load less than the actual value) in central air conditioning chilled water systems can cause delayed chiller startup. In this case, even at maximum capacity, the chiller still cannot provide sufficient cooling capacity, causing the chilled water supply temperature to rise first, and the chiller operating current to reach and remain near its maximum. Furthermore, due to the thermal inertia of the central air conditioning chilled water system and the building envelope, the indoor return air temperature remains stable, ensuring thermal comfort, resulting in a relatively minor impact. Subsequently, if additional chillers are not started promptly, the increased chilled water supply temperature will cause a continuous increase in the required chilled water flow at the terminal, leading to reverse flow in the bypass pipe and a decrease in system control robustness, resulting in a moderate impact. This reverse flow in the bypass pipe will further increase the chilled water supply temperature, leading to a chain reaction that can cause an abnormal increase in indoor temperature and a decrease in thermal comfort, resulting in a significant impact.

[0059] Based on this, the embodiment of the present application divides the cooling load threshold into deviation levels and allocates corresponding correction coefficients according to the degree of influence of these key parameters (chilled water supply temperature, chiller operating current, indoor return air temperature, and bypass pipe reverse flow).

[0060] In addition, the positive measurement deviation of cooling load mainly leads to the decrease of chiller efficiency. The changes of related system parameters are not obvious, and it is difficult to judge the deviation level. The positive measurement deviation of cooling load will not affect the stability of the system. Since the chiller always provides sufficient cooling capacity, the impact is relatively minor. Therefore, only the correction factor of slight deviation needs to be uniformly used to prevent over-calibration.

[0061] In some embodiments, when the multi-sensor collaborative network architecture provided in the embodiments of the present application is actually deployed, the corresponding operation logic module can be used to diagnose the deviation direction and level of the preset cooling load threshold for each chiller startup event, and gradually correct the cooling load threshold deviation to gradually eliminate until the negative impact of the cooling load measurement deviation is completely offset, thereby achieving the effect of tolerating the cooling load measurement deviation.

[0062] In addition, the multi-sensor collaborative network architecture provided in the embodiment of the present application mainly utilizes the abnormal fluctuations in the measurement data of each sensor and the physical connection between each sensor to diagnose the direction and level of the deviation of the cooling load threshold. Therefore, the multi-sensor collaborative network architecture provided in the embodiment of the present application can work normally as long as the sensor network can capture the fluctuations in the measurement data. Even if the sensors used in the multi-sensor network have measurement uncertainties, the diagnosis of the cooling load threshold deviation can be completed, thereby having good robustness.

[0063] In some embodiments, the multiple sensors of the multi-sensor collaborative network architecture may include:

[0064] A first temperature sensor is installed at the location of the chilled water main pipe and is used to measure the temperature of the chilled water in the chilled water main pipe; the chilled water main pipe is connected to the chiller;

[0065] The second temperature sensor is installed at the end of the fan coil unit and is used to measure the indoor return air temperature; the fan coil unit is connected to the chilled water main.

[0066] like Figure 1 As shown, among the multiple sensors of the multi-sensor collaborative network architecture, the first temperature sensor may be a chilled water supply temperature sensor installed at the chilled water main, and the second temperature sensor may be an indoor temperature sensor installed at the end of the fan coil unit.

[0067] In this embodiment, the multi-sensor collaborative network architecture can measure the temperature of the chilled water in the chilled water main (chilled water supply temperature) through a first temperature sensor, and measure the indoor return air temperature through a second temperature sensor, and then receive these temperature data based on a motion logic module, thereby diagnosing the deviation direction and level of the preset cooling load threshold based on simple operation logic, and adaptively adjust the cooling load threshold to gradually eliminate until it is completely offset. The negative impact of the cooling load measurement deviation on the timing control of the chiller.

[0068] In some embodiments, the multiple sensors of the multi-sensor collaborative network architecture may further include:

[0069] The first flow sensor is installed at the location of the bypass pipe and is used to measure the backflow flow in the bypass pipe; one end of the bypass pipe is connected to the inlet pipe of the chilled water main pipe, and the other end of the bypass pipe is connected to the outlet pipe of the chilled water main pipe.

[0070] like Figure 1 As shown, among the multiple sensors in the multi-sensor collaborative network architecture, the first flow sensor can be a flow sensor installed in the bypass pipe.

[0071] In this embodiment, the multi-sensor collaborative network architecture can measure the reverse flow rate in the bypass pipe using a first flow sensor. The motion logic module then receives this flow data and, based on simple operational logic, combines this flow data and / or the aforementioned temperature data to diagnose the direction and level of deviation from the preset cooling load threshold. The system then adaptively adjusts the cooling load threshold to offset the negative impact of cooling load measurement deviations on the chiller's sequential control.

[0072] In some embodiments, the multiple sensors of the multi-sensor collaborative network architecture may further include:

[0073] Current sensor: The current sensor is installed at the location of the chiller and is used to measure the operating current of the chiller.

[0074] like Figure 1 As shown, among the multiple sensors in the multi-sensor collaborative network architecture, the current sensor can be a current sensor installed in a chiller.

[0075] In this embodiment, the multi-sensor collaborative network architecture can measure the operating current of the chiller through a current sensor, and then the motion logic module receives the operating current. Based on simple operating logic, combined with the operating current, the above-mentioned flow data and / or the above-mentioned temperature data, the deviation direction and level of the preset cooling load threshold are diagnosed, and the cooling load threshold is adaptively adjusted to offset the negative impact of the cooling load measurement deviation on the timing control of the chiller.

[0076] The multi-sensor collaborative network architecture provided in the embodiment of the present application is based on the physical characteristics of the central air-conditioning chilled water system under different cooling load measurement deviations (i.e., incorrect opening and closing of the chiller), combined with expert knowledge, and deploys collaborative sensors at key locations of the central air-conditioning chilled water system to form a multi-sensor collaborative network architecture, including: a chilled water supply temperature sensor (first temperature sensor) installed at the main pipe, a current sensor installed in the chiller, a flow sensor (first flow sensor) installed in the bypass pipe, and an indoor temperature sensor (second temperature sensor) installed at the end of the fan coil unit.

[0077] Thus, compared to conventional sensor deployment architectures, the installation locations of the multiple sensors in the multi-sensor collaborative network architecture provided by the embodiments of the present application are closely related to the fault propagation chain of incorrect chiller startup and shutdown, and work in conjunction with each other. This allows the data measured by the multiple sensors to not only reflect the direction of the cooling load deviation when the chiller is turned on and off, but also to diagnose the cooling load deviation level by detecting the status of sensors at different locations based on the fault propagation chain. This allows the cooling load threshold to be adaptively adjusted based on the information transmitted by the network composed of multiple sensors to offset the impact of cooling load measurement deviation.

[0078] It should be noted that the multi-sensor collaborative network architecture provided in the embodiments of the present application can be incorporated into the controller or server of the building automation system. In this way, in order to address the problem of cooling load measurement deviation in central air-conditioning chilled water systems that is common and difficult to solve, resulting in a decrease in the robustness and energy efficiency of chiller sequence control, by deploying the multi-sensor collaborative network architecture provided in the embodiments of the present application, the key parameters of the central air-conditioning chilled water system in the current chiller start event are first obtained based on multiple sensors in the architecture, including chilled water supply temperature, chiller operating current, bypass pipe flow rate, and indoor return air temperature. Subsequently, fault detection is performed based on the operation logic module in combination with these key parameters collected by multiple sensors to identify the fault status of each parameter of the central air-conditioning chilled water system and thereby diagnose the direction and level of the cooling load measurement deviation. For example, the operation logic module uses pre-stored diagnostic thresholds for determining the fault status of key parameters such as chilled water outlet temperature, chiller operating current, first-order difference of chiller operating current, bypass pipe reverse flow rate, and indoor return air temperature. If a parameter is greater than its corresponding threshold, the link location where the sensor collecting the parameter is located is determined to be faulty.

[0079] Next, based on the physical correlations between multiple sensors and the fault conditions of these parameters, the direction and level of deviation of the cooling load threshold are determined. Furthermore, based on the determined direction and level of the cooling load measurement deviation, a correction factor is assigned based on this operational logic module. The correction factor is set to 1 when the cooling load threshold is diagnosed as under-deviation (defined as the current cooling load threshold being less than the expected value), and -1 when it is diagnosed as over-deviation (defined as the current cooling load threshold being greater than the expected value), thus clarifying the direction of correction for the cooling load threshold.

[0080] Finally, the operational logic module updates the cooling load threshold for the next chiller sequence control cycle based on the deviation direction of the cooling load threshold diagnosed in the two consecutive chiller startup events and the cooling load threshold deviation level diagnosed in the current chiller startup event. The basic logic is that if the current cooling load threshold is diagnosed as under-deviation (the current cooling load threshold is less than the expected value), the cooling load threshold is increased. Conversely, if the current cooling load threshold is diagnosed as over-deviation (the current cooling load threshold is greater than the expected value), the cooling load threshold is decreased.

[0081] It's important to note that the expected cooling load threshold should be between the cooling load thresholds for under- and over-deviation. Therefore, the correction range can be determined based on the direction of the cooling load threshold deviation diagnosed during two consecutive chiller startup events. The final correction range is determined based on the determined correction direction factor, correction coefficient, and correction range.

[0082] In some embodiments, there are multiple current sensors in the multi-sensor collaborative network architecture. An nth current sensor among the multiple current sensors is installed in an nth chiller among the multiple chillers. Thus, the multi-sensor collaborative network architecture can measure the operating current of the nth chiller through the nth current sensor. Here, n is an integer greater than or equal to 1.

[0083] like Figure 1 As shown, in the case where a central air-conditioning chilled water system has multiple chillers, there are also multiple current sensors in the multi-sensor collaborative network architecture. Among them, the nth current sensor is installed in the nth chiller among the multiple chillers, and the nth current sensor is used to measure the operating current of the nth chiller. For example, Figure 1 The current sensor in the chiller 1 shown is mainly used to measure the operating current of the chiller 1, the current sensor in the chiller 2 is mainly used to measure the operating current of the chiller 2, and the current sensor in the chiller n is mainly used to measure the operating current of the chiller n.

[0084] In some embodiments, the current sensor in the multi-sensor collaborative network architecture may also be a single current sensor, which may be installed in the total power supply circuit of multiple chillers to measure the total operating current of the multiple chillers.

[0085] In this embodiment, when the central air-conditioning chilled water system has multiple chillers, a single current sensor in the multi-sensor collaborative network architecture can be installed in the total power supply circuit of multiple chillers. In this way, the multi-sensor collaborative network architecture can measure the total operating current of multiple chillers through the single current sensor.

[0086] In this embodiment, a single current sensor is installed in the total power supply circuit of multiple chillers, so that the total operating current of multiple chillers is measured by the single current sensor. The operating logic module combines the total operating current, the above-mentioned flow data and / or the above-mentioned temperature data to diagnose the deviation direction and level of the preset cooling load threshold, and adaptively adjust the cooling load threshold to offset the negative impact of the cooling load measurement deviation on the timing control of the chiller.

[0087] In this way, the number of current sensors used can be reduced, thereby improving the performance of chiller sequence control under cooling load measurement deviation, ensuring the operating energy efficiency and robustness of the system chiller, and reducing the cost consumption of the multi-sensor collaborative network architecture in actual deployment.

[0088] See also Figure 2 , Figure 2 A schematic diagram of the structure involved in some embodiments of the chiller sequence control system based on a multi-sensor collaborative network architecture provided in the embodiments of the present application.

[0089] like Figure 2 As shown, the chiller sequence control system based on the multi-sensor collaborative network architecture provided by the embodiment of the present application may include: the multi-sensor collaborative network architecture as described in any of the above embodiments;

[0090] The chiller sequence controller is connected to the multi-sensor collaborative network architecture and the chiller respectively, and is used to receive the updated cooling load threshold transmitted by the multi-sensor collaborative network architecture to generate a control signal to control the chiller to start or stop operation.

[0091] In an embodiment of the present application, during the operation of the central air-conditioning chilled water system, the chiller sequence control system receives the adjusted (also called corrected or updated) cooling load threshold transmitted by the above-mentioned multi-sensor collaborative network architecture through the chiller sequence controller, and then generates a control signal for the chiller based on the cooling load threshold to control one or more chillers to start or stop operation.

[0092] In this way, the cooling load threshold is adaptively adjusted based on the multi-sensor collaborative network architecture to offset the impact of cooling load measurement deviation, which can improve or even enhance the performance of chiller sequence control under the existence of load measurement deviation, thereby ensuring the operating energy efficiency and robustness of the chiller in the central air-conditioning chilled water system.

[0093] In some embodiments, the chiller sequence controller in the chiller sequence control system can also be directly connected to the first temperature sensor among multiple sensors in the multi-sensor collaborative network architecture, so as to receive the temperature of the chilled water at the inlet of the chilled water main measured by the first temperature sensor, and generate a control signal based on this to control the chiller to start or stop operation.

[0094] In this embodiment, by directly connecting the chiller sequence controller in the chiller sequence control system to the above-mentioned first temperature sensor, the chiller sequence controller can generate a control signal for the chiller to control one or more chillers to start or stop operation by only measuring the temperature of the chilled water at the inlet of the chilled water main pipe by the first temperature sensor during the operation of the central air-conditioning chilled water system.

[0095] Afterwards, the chiller sequence controller can further receive the adjusted cooling load threshold transmitted by the multi-sensor collaborative network architecture to offset the impact of cooling load measurement deviation, thereby improving or even enhancing the performance of the chiller sequence control and ensuring the operating energy efficiency and robustness of the chiller in the central air-conditioning chilled water system.

[0096] In some embodiments, the chiller sequence control system may further include:

[0097] A second flow sensor is installed at the location of the chilled water main pipe and is used to measure the flow rate of chilled water at the inlet of the chilled water main pipe;

[0098] The chiller sequence controller in the chiller sequence control system is connected to the second flow sensor and is used to receive the flow of chilled water at the inlet of the chilled water main measured by the second flow sensor to generate a control signal to control the chiller to start or stop operation.

[0099] In this embodiment, a second flow sensor is installed at the location of the chilled water main, for example, at the inlet of the chilled water main, so that the flow rate of chilled water at the inlet of the chilled water main is measured by the second flow sensor. Furthermore, by directly connecting a chiller sequence controller in a chiller sequence control system to the second flow sensor, the chiller sequence controller can generate control signals for the chillers during operation of the central air conditioning chilled water system based on the chilled water flow rate at the inlet of the chilled water main measured by the second flow sensor, thereby controlling the start or stop of one or more chillers.

[0100] Afterwards, the chiller sequence controller can further receive the adjusted cooling load threshold transmitted by the multi-sensor collaborative network architecture to offset the impact of cooling load measurement deviation, thereby improving or even enhancing the performance of the chiller sequence control and ensuring the operating energy efficiency and robustness of the chiller in the central air-conditioning chilled water system.

[0101] In some embodiments, the chiller sequence control system may further include:

[0102] A third temperature sensor is installed at the location of the chilled water main pipe, and is used to measure the temperature of the chilled water at the outlet of the chilled water main pipe;

[0103] The chiller sequence controller is connected to the third temperature sensor and is used to receive the temperature of the chilled water at the chilled water main outlet measured by the third temperature sensor to generate a control signal to control the chiller to start or stop operation.

[0104] In this embodiment, a third temperature sensor is installed at the location of the chilled water main, for example, at the outlet of the chilled water main, so that the temperature of the chilled water at the outlet of the chilled water main is measured by the third temperature sensor. Furthermore, by connecting a chiller sequence controller in the chiller sequence control system to the third temperature sensor, the chiller sequence controller can generate a control signal for the chillers during operation of the central air conditioning chilled water system, combining the chilled water flow rate at the inlet of the chilled water main measured by the second flow sensor and the chilled water temperature at the outlet of the chilled water main measured by the third temperature sensor, thereby controlling the start or stop of one or more chillers. This signal is then used to control the operation of the chillers.

[0105] After that, the chiller sequence controller can further receive the adjusted cooling load threshold transmitted by the multi-sensor collaborative network architecture to offset the impact of cooling load measurement deviation, thereby improving or even enhancing the performance of chiller sequence control and ensuring the operating energy efficiency and robustness of the chiller in the central air-conditioning chilled water system.

[0106] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0107] Those skilled in the art will appreciate that the device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0108] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-sensor collaborative network architecture, characterized in that: The multi-sensor collaborative network architecture is used to adaptively adjust the cooling load threshold to offset the impact of cooling load prediction deviation in chiller sequence control; The multi-sensor collaborative network architecture includes: Multiple sensors, the installation locations of the multiple sensors including locations associated with a fault propagation chain that could cause incorrect startup and shutdown of the chiller; the fault propagation chain including increased chilled water supply temperature, reverse flow in the bypass pipe, and abnormally increased indoor temperature; An operation logic module is connected to the multiple sensors respectively, and is used to receive sensor signals transmitted by the multiple sensors respectively to adaptively adjust the cooling load threshold.

2. The multi-sensor collaborative network architecture according to claim 1, characterized in that: The plurality of sensors include: a first temperature sensor, the first temperature sensor being installed at a location where a chilled water main is located, and being used to measure the temperature of chilled water in the chilled water main; the chilled water main is connected to the chiller; The second temperature sensor is installed at the end of the fan coil unit and is used to measure the indoor return air temperature; the fan coil unit is connected to the chilled water main.

3. The multi-sensor collaborative network architecture according to claim 2, characterized in that: The plurality of sensors further comprises: A first flow sensor is installed at the location of the bypass pipe and is used to measure the backflow flow in the bypass pipe; one end of the bypass pipe is connected to the water inlet pipe of the chilled water main pipe, and the other end of the bypass pipe is connected to the water outlet pipe of the chilled water main pipe.

4. The multi-sensor collaborative network architecture according to claim 2 or 3, characterized in that: The plurality of sensors further comprises: A current sensor is installed at the location of the chiller and is used to measure the operating current of the chiller.

5. The multi-sensor collaborative network architecture according to claim 4, characterized in that: There are multiple current sensors, and the nth current sensor among the current sensors is installed in the nth chiller among the multiple chillers, and the nth current sensor is used to measure the operating current of the nth chiller; n is an integer greater than or equal to 1.

6. The multi-sensor collaborative network architecture according to claim 4, characterized in that: The current sensor is installed in the total power supply circuit of the plurality of chillers and is used to measure the total operating current of the plurality of chillers.

7. A chiller sequence control system based on a multi-sensor collaborative network architecture, characterized in that: The chiller sequence control system comprises a multi-sensor collaborative network architecture according to any one of claims 1 to 6; The chiller sequence control system also includes a chiller sequence controller, which is connected to the multi-sensor collaborative network architecture and the chiller respectively, and is used to receive the updated cooling load threshold transmitted by the multi-sensor collaborative network architecture to generate a control signal to control the chiller to start or stop operation.

8. The chiller sequence control system according to claim 7, characterized in that: The chiller sequence controller is also connected to the first temperature sensor among the multiple sensors of the multi-sensor collaborative network architecture, and is used to receive the temperature of the chilled water at the inlet of the chilled water main measured by the first temperature sensor to generate a control signal to control the chiller to start or stop operation.

9. The chiller sequence control system according to claim 7, characterized in that: The chiller sequence control system further comprises: a second flow sensor, the second flow sensor being installed at a location where the chilled water main is located, and being used to measure the flow rate of the chilled water at an inlet of the chilled water main; The chiller sequence controller is connected to the second flow sensor and is used to receive the flow of chilled water at the inlet of the chilled water main measured by the second flow sensor to generate a control signal to control the chiller to start or stop operation.

10. The chiller sequence control system according to claim 9, characterized in that: The chiller sequence control system further comprises: a third temperature sensor, installed at the location of the chilled water main pipe, for measuring the temperature of the chilled water at the outlet of the chilled water main pipe; The chiller sequence controller is connected to the third temperature sensor and is used to receive the temperature of the chilled water at the chilled water main outlet measured by the third temperature sensor to generate a control signal to control the chiller to start or stop operation.

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