Energy-saving operation device and method for industrial plant air conditioning system

Abstract

The present application relates to a kind of industrial plant air conditioning system energy-saving operation device and operation method, including subarea perception unit, waste heat recovery unit, subarea air supply regulation unit, variable frequency power unit and intelligent control unit.The present application is combined with subarea perception, waste heat cascade recovery, variable frequency linkage, load prediction and peak-valley energy-saving multidimensional fusion, solve the existing technical defects of high and large factory building air conditioning energy saving, aim at reducing environmental pollution, improve resource utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of energy-saving optimization technology for air conditioning systems in industrial plants, specifically to an energy-saving operation device and operation method for an air conditioning system in an industrial plant. Background Technology

[0002] Industrial plants, as the core carriers of industrial production, are generally characterized by large spatial volume, mixed functional zoning, centralized heat generation from production equipment, dispersed personnel work areas, and drastic dynamic fluctuations in heating and cooling loads. Their supporting air conditioning systems not only undertake the core functions of maintaining constant temperature and humidity in the workshop environment and adapting the heat dissipation conditions of production equipment, but also play a crucial role in ensuring a safe working environment for personnel. Compared to air conditioning systems in civil buildings, industrial plant air conditioning systems operate for longer periods, experience more drastic load fluctuations, and account for a higher proportion of energy consumption. According to industrial building energy consumption statistics, air conditioning system energy consumption can account for 30% to 50% of the overall operation and maintenance energy consumption of industrial plants, making it a key control link for energy conservation and consumption reduction in industrial production.

[0003] Currently, conventional industrial plant air conditioning systems mostly adopt a unified control mode for the entire area. The entire system operates at a constant maximum design load, without fine-tuning based on the different internal working conditions of the plant. Industrial plants typically contain multiple functional areas, such as equipment heat generation areas, personnel work areas, public passageways, and idle / vacant areas. The equipment heat generation load, personnel attendance, and environmental temperature control requirements vary significantly between these areas: equipment work areas continuously generate heat with stable and high loads; personnel work areas only require temperature control during working hours; public passageways have low loads due to personnel flow; and idle / vacant areas have virtually no need for temperature control. Traditional air conditioning systems cannot distinguish the differences in operating conditions between these zones, resulting in long-term full-load operation across the entire area and generating a large amount of ineffective energy consumption.

[0004] Meanwhile, the continuous operation of production equipment in industrial plants generates a large amount of waste heat, which is directly discharged into the exhaust airflow, resulting in a significant waste of low-grade waste heat resources. Furthermore, the fresh air systems in these plants often employ direct pre-treatment of cooling and heating, failing to utilize the waste heat from the exhaust air for tiered heat exchange, leading to persistently high energy consumption in fresh air treatment. In addition, traditional factory air conditioning systems mostly use fixed-frequency equipment operating at constant speed. The output power of fans, pumps, and chillers cannot be dynamically matched to the real-time cooling and heating load, resulting in a common "overpowered" operating condition, leading to low equipment efficiency and severe energy waste.

[0005] With the continuous implementation of policies promoting green and low-carbon industrial development and the ongoing upgrading of energy-saving and consumption-reducing standards for industrial buildings, the traditional extensive, undifferentiated, and waste heat recovery-free air conditioning operation mode in factories can no longer meet the development needs of modern industrial factories for high efficiency, precise temperature control, and low-carbon operation and maintenance. There is an urgent need for an intelligent energy-saving air conditioning operation solution that can achieve precise zoned control, tiered waste heat recovery, and dynamic load matching to solve the industry pain points of high energy consumption, extensive control, and low resource utilization of existing technologies. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an energy-saving operation device and operation method for an industrial plant air conditioning system, aiming to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: On the one hand, an energy-saving operation device for an industrial plant air conditioning system is proposed, including a zone sensing unit, a waste heat recovery unit, a zone air supply regulation unit, a variable frequency power unit, and an intelligent control unit; The zone sensing units are deployed in each functional zone of the industrial plant, including temperature and humidity sensors, human presence sensors and infrared thermal imaging acquisition modules, to collect environmental parameters, personnel on-duty status and equipment heat load data in each zone in real time. The waste heat recovery unit is connected to the factory exhaust duct and the air conditioning fresh air duct respectively. It includes a primary air-to-air heat exchange component and a secondary waste heat storage component. It is used to recover the equipment waste heat and environmental waste heat carried by the factory exhaust in stages, and to use the recovered waste heat to preheat or precool the air conditioning fresh air. Each zone air supply control unit is equipped with an electric air valve, a variable air volume air supply outlet and a zone return air outlet for each functional zone of the plant. Each zone independently constructs an air supply loop to adaptively adjust the air supply volume and air supply operation status according to the real-time load of each zone. The variable frequency power unit includes a variable frequency chiller, a variable frequency air supply fan, a variable frequency return air fan, and a variable frequency circulating water pump. Each device in the variable frequency power unit is connected to the main air conditioning pipeline and the air supply circuit of each zone. The intelligent control unit is connected to the zone sensing unit, waste heat recovery unit, zone air supply regulation unit, and variable frequency power unit. The intelligent control unit has a built-in load prediction model and energy-saving control logic, which can coordinate and regulate each functional unit according to real-time collected field data, outdoor meteorological data and preset operating conditions to achieve energy-saving operation of the air conditioning system.

[0008] As a preferred technical solution, industrial plants are divided into equipment heat generation areas, personnel operation areas, public passage areas, and idle areas according to their functions. Each area is independently equipped with a set of temperature and humidity sensors, human presence sensors, and electric air valves.

[0009] As a preferred technical solution, the primary air-to-air heat exchange component is a plate heat exchanger, which is connected in series between the exhaust duct and the fresh air duct to complete the initial temperature and humidity control of the fresh air with the help of the exhaust waste heat; the secondary waste heat storage component is connected to the waste heat output end of the plate heat exchanger, and is filled with a phase change heat storage medium to store excess waste heat and release heat to the outside under low-load conditions of the air conditioner.

[0010] As a preferred technical solution, the variable air volume air outlet is equipped with a wind speed regulating motor and guide vanes; the intelligent control unit adjusts the opening of the guide vanes and the operating speed of the fan to achieve stepless continuous adjustment of the air volume of a single zone.

[0011] As a preferred technical solution, the zone sensing unit is also equipped with an outdoor meteorological sensor. The outdoor meteorological sensor collects outdoor temperature, outdoor humidity and outdoor wind speed data, and uploads the collected data to the intelligent control unit for use by the load forecasting model.

[0012] As a preferred technical solution, all variable frequency devices in the variable frequency power unit adopt a linkage and coordinated control mode; the output power of the chiller unit is dynamically adjusted according to the total cooling and heating load of the plant, and the operating speed of the blower, return air fan and circulating water pump are synchronously matched with the load of the chiller unit.

[0013] On the other hand, an energy-saving operation method for an industrial plant air conditioning system based on the above-mentioned device is also proposed, comprising the following steps: S1. The zone sensing unit collects the temperature and humidity of each zone of the factory, the on-duty status of personnel, the heat generation data of equipment and outdoor meteorological parameters in real time, and transmits all collected data to the intelligent control unit. S2, the intelligent control unit combines historical operating data, time-period operating parameters and outdoor meteorological data to predict the real-time load and short-term load fluctuation trends of each zone through the built-in load prediction model; S3. The waste heat recovery unit performs a cascade heat exchange process, using the waste heat carried by the factory exhaust to pre-treat the fresh air, reducing the energy consumption required for fresh air temperature and humidity control. S4. The intelligent control unit adjusts the opening degree of the electric air valve and variable air volume air outlet of the corresponding zone according to the heating and cooling load of each zone and the personnel on duty signal. Among them, the personnel operation area and the high load equipment area supply air normally according to the rated load, the air supply volume of the public passage area is reduced, and the air supply path of the idle area is cut off, and only a small amount of return air is maintained to ensure the basic circulation of the pipeline. S5, the intelligent control unit links and regulates the variable frequency power unit, adjusts the operating frequency of the variable frequency chiller, variable frequency air supply fan, variable frequency return air fan and variable frequency circulating water pump according to the overall cooling and heating load of the plant, and realizes dynamic matching between system power output and real-time load; S6. Iteratively execute steps S1 to S5, continuously and dynamically adjusting the operating conditions of each unit to achieve continuous energy-saving operation of the air conditioning system.

[0014] As a preferred technical solution, in step S4, if the human presence sensor detects that the corresponding zone has been unoccupied for a period of time exceeding a preset threshold, the intelligent control unit controls the electric air valve of that zone to be completely shut off, maintaining only the minimum circulating air pressure of the overall air conditioning system.

[0015] As a preferred technical solution, in step S3, when the outdoor ambient temperature is lower than the factory exhaust temperature, the first-stage plate heat exchanger is started to preheat the fresh air; when the factory generates excess waste heat, the second-stage waste heat storage component is started to store the waste heat, and the stored waste heat is released at night or under low temperature conditions to assist the air conditioning in temperature regulation.

[0016] As a preferred technical solution, in step S5, the intelligent control unit incorporates a peak-valley power consumption control strategy; during peak power consumption periods, the unit's operating load is reduced first, and the thermal storage components are simultaneously activated to release stored heat; during off-peak power consumption periods, the unit's operating efficiency is improved, and surplus heat is used to complete the thermal storage medium's heat storage.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial effects: Firstly, this invention adopts a multi-dimensional zone sensing method, which can accurately obtain the dynamic load and personnel status of each production zone, solving the problems of traditional factory air conditioning's uniform and extensive control of the entire area and poor matching of zone operating conditions. It effectively balances the comfort of the factory environment and the stability of the production process, reducing ineffective energy loss from the source.

[0018] Secondly, by adopting a tiered waste heat recovery combined with a heat storage structure, the utilization rate of waste heat recovery from factory exhaust is greatly improved. By pre-treating fresh air with waste heat, the fresh air handling load of the air conditioning unit is significantly reduced, effectively revitalizing waste heat resources and reducing the overall energy consumption of the system.

[0019] Third, each zone is equipped with an independent adjustable air supply circuit, which can adaptively supply air volume according to the load fluctuation of the zone, truly realizing on-demand cooling / heating, adapting to the operating characteristics of industrial plants with multiple zones and large dynamic load fluctuations, and making the control more precise and adaptable to operating conditions.

[0020] Fourth, the entire set of power equipment adopts a variable frequency controllable operation mode, which can dynamically adjust the output power according to the real-time load, avoid the output redundancy problem of fixed frequency equipment operating at full load for a long time, significantly reduce operating energy consumption, reduce equipment mechanical wear, extend equipment service life, and reduce operation and maintenance costs.

[0021] Fifth, this invention realizes multi-unit linkage and intelligent control based on load prediction, breaking the drawbacks of independent operation of each module and fragmented strategies in traditional systems. It can dynamically adapt to indoor and outdoor working conditions to generate the optimal energy-saving operation strategy, greatly improving the overall operating energy efficiency and intelligent management level of industrial plant air conditioning systems. It has significant energy-saving effects and high value for industrial application and promotion. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an energy-saving operation device for an industrial plant air conditioning system proposed in this invention; Figure 2 This is a schematic diagram of the cascade waste heat recovery structure proposed in this invention; Figure 3 This is a schematic diagram of a method for energy-saving operation of an industrial plant air conditioning system proposed in this invention.

[0023] Explanation of reference numerals in the attached diagram: 1. Zone sensing unit; 2. Waste heat recovery unit; 3. Zone air supply regulation unit; 4. Variable frequency power unit; 5. Intelligent control unit. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 This embodiment provides an energy-saving operation device for an industrial plant air conditioning system, including a zone sensing unit, a waste heat recovery unit, a zone air supply regulation unit, a variable frequency power unit, and an intelligent control unit.

[0026] The zone sensing units are deployed in various functional zones of the industrial plant, including temperature and humidity sensors, human presence sensors, and infrared thermal imaging acquisition modules, to collect environmental parameters, personnel on-duty status, and equipment heat load data in real time for each zone.

[0027] The waste heat recovery unit is connected to the factory exhaust duct and the air conditioning fresh air duct respectively. It includes a primary air-to-air heat exchange component and a secondary waste heat storage component. It is used to recover the equipment waste heat and environmental waste heat carried by the factory exhaust in stages, and to use the recovered waste heat to preheat or precool the air conditioning fresh air.

[0028] Each zone air supply control unit is equipped with an electric air valve, a variable air volume air supply outlet, and a zone return air outlet for each functional zone of the plant. Each zone independently constructs an air supply loop to adaptively adjust the air supply volume and air supply operation status according to the real-time load of each zone.

[0029] The variable frequency power unit includes a variable frequency chiller, a variable frequency air supply fan, a variable frequency return air fan, and a variable frequency circulating water pump. Each device in the variable frequency power unit is connected to the main air conditioning pipeline and the air supply circuit of each zone.

[0030] The intelligent control unit is connected to the zone sensing unit, waste heat recovery unit, zone air supply regulation unit, and variable frequency power unit. The intelligent control unit has a built-in load prediction model and energy-saving control logic, which can coordinate and regulate each functional unit according to real-time collected field data, outdoor meteorological data and preset operating conditions to achieve energy-saving operation of the air conditioning system.

[0031] The working principle and beneficial effects of the above technical solution are as follows: The energy-saving operation device of the industrial plant air conditioning system of the present invention takes an intelligent control unit as its core, relies on the zoning sensing units arranged in each functional area of ​​the plant, and combines temperature and humidity sensors, human presence sensors and infrared thermal imaging acquisition modules to collect real-time and accurate on-site data such as environmental parameters, personnel on-duty status and equipment heat load of each zone, and builds a comprehensive data foundation in combination with outdoor meteorological conditions. The waste heat recovery unit recovers and stores the equipment waste heat and environmental waste heat carried by the plant exhaust air in a tiered manner through a primary air-to-air heat exchange component and a secondary waste heat storage component. The recovered waste heat is used to preheat or precool the fresh air, effectively reducing the basic load of the fresh air. The zoning air supply regulation unit sets up an independent air supply circuit for each zone. Through electric air valves and variable air volume air outlets, it adaptively adjusts the air supply volume and air supply conditions according to the real-time load of each zone to achieve on-demand air supply for each zone. The variable frequency power unit performs variable frequency speed control on core equipment such as chillers, supply and return air fans, and circulating water pumps, so that the equipment output matches the actual cooling and heating load and air supply demand of the system in real time. Finally, the intelligent control unit, combining a built-in load prediction model and energy-saving control logic, performs integrated and coordinated regulation of various units, including sensing, waste heat recovery, zoned air supply, and variable frequency power. It dynamically outputs the optimal operating strategy based on real-time operating conditions, achieving refined, intelligent, and energy-saving operation of the entire air conditioning system. Furthermore, a three-way valve and a return air filter static pressure box (return air purification box) are sequentially installed on the air return duct between the waste heat recovery unit and the zoned sensing unit. The return air purification box is a pre-treatment box for the hot return air from the workshop before it enters the waste heat recovery device. The slanted component in the diagram is a built-in flow guide plate, and the small interface at the top is a maintenance / differential pressure monitoring port. The main functions are as follows: 1) To intercept dust, debris, and floating dust carried by the return air from the production area, preventing impurities from entering the waste heat recovery heat exchange components and clogging the heat exchange core, protecting downstream equipment such as heat exchangers, pipelines, and fans, extending the life of the entire system, and reducing the frequency of cleaning and maintenance; 2) To convert high-speed dynamic pressure airflow into uniform static pressure, stabilizing the airflow and air pressure entering the waste heat recovery unit, improving air-to-air heat exchange efficiency, and ensuring sufficient waste heat recovery; 3) To absorb the noise from equipment vibration and duct airflow carried by the return air from the workshop, reducing noise. 4) The sound is transmitted backward to the waste heat recovery and air supply ducts, reducing the overall air conditioning noise of the factory; 5) The airflow impact of the return air from multiple areas of the buffer workshop is combined to fully mix the return air with different temperatures and humidity, so that the intake air temperature of the waste heat recovery unit is uniform, improving the stability of heat recovery, and facilitating the central control system to accurately collect return air temperature and humidity data and accurately predict the load; 6) The top is reserved with a detection interface, which can be equipped with a differential pressure sensor to monitor the degree of filter clogging in real time, and realize the filter clogging early warning in conjunction with the central control system; the cabinet can be opened to facilitate regular filter replacement and internal cleaning.

[0032] Example 2 In this embodiment, the industrial plant is divided into equipment heat generation area, personnel operation area, public passage area and idle area according to its function. Each area is independently equipped with a set of temperature and humidity sensors, human presence sensors and electric air valves.

[0033] The working principle and beneficial effects of the above technical solution are as follows: During system operation, dedicated sensing devices in each zone can independently and accurately collect temperature and humidity environmental parameters, personnel on-duty status, and equipment heat load data for their respective areas, effectively avoiding the problems of data distortion and ambiguous load characteristics caused by traditional unified sampling across the entire area and mixed operating conditions in multiple areas. By subdividing the factory building into domains according to functional attributes, coupled with a supporting structure of "one set of independent sensing devices for each zone and one set of independent air valve control for each zone," the technical defects of traditional factory air conditioning zoning—such as coarse division, unified control across the entire area, and poor adaptability to operating conditions—are completely overcome. Through independent and accurate detection in each zone, the dynamic load change characteristics of each area can be effectively captured, eliminating data deviation and load masking problems caused by average sampling across the entire area, providing high-precision data support for intelligent and precise system control. Meanwhile, each zone can independently control the air supply conditions, directly cut off the air supply circuit for idle areas to eliminate ineffective energy loss, and allocate air supply volume differently for equipment heat generation areas, personnel operation areas and public passage areas according to their respective load characteristics, so as to completely solve the problem of mismatch between cooling and heating supply and demand in different operating areas and greatly improve the efficiency of air conditioning air supply utilization.

[0034] Example 3 In this embodiment, the primary air-to-air heat exchange component is a plate heat exchanger, which is connected in series between the exhaust duct and the fresh air duct to complete the initial temperature and humidity control of the fresh air with the help of the exhaust waste heat; the secondary waste heat storage component is connected to the waste heat output end of the plate heat exchanger, and is filled with a phase change heat storage medium to store excess waste heat and release heat to the outside under low-load conditions of the air conditioner.

[0035] The working principle and beneficial effects of the above technical solution are as follows: By improving the waste heat recovery unit, a plate heat exchanger connected in series with the fresh air duct and the exhaust air duct is adopted as the primary heat exchange structure. The waste heat from the factory exhaust air is used for initial temperature and humidity pretreatment of the fresh air. Simultaneously, a secondary waste heat storage component filled with a phase change heat storage medium is installed at the waste heat output end of the plate heat exchanger. During operation, the primary plate heat exchanger completes efficient heat exchange between the exhaust air and the fresh air, achieving preliminary pretreatment of the fresh air. The secondary waste heat storage component can store excess waste heat generated during the heat exchange process and release heat energy to supplement energy under low-load air conditioning conditions, achieving cascaded recovery and peak-shifting utilization of waste heat. This invention adopts a tiered waste heat recovery mode that combines plate-type high-efficiency heat exchange with phase change heat storage. It overcomes the shortcomings of traditional single heat exchange structures, such as low waste heat utilization rate, inability to store heat, and poor adaptability to operating conditions. It effectively avoids the problems of instantaneous excess waste heat and insufficient heat source during low-load periods, steadily improves the fresh air pretreatment effect, significantly reduces the air conditioning fresh air handling load, and greatly improves the energy-saving operation performance of the system under all operating conditions.

[0036] Example 4 In this embodiment, the variable air volume air outlet is equipped with a wind speed regulating motor and guide vanes; the intelligent control unit can achieve stepless continuous adjustment of the air volume of a single zone by adjusting the opening of the guide vanes and the operating speed of the fan.

[0037] The working principle and beneficial effects of the above technical solution are as follows: A speed-regulating motor and guide vanes are configured inside the variable air volume (VAV) air outlet. The intelligent control unit can coordinately adjust the opening of the guide vanes and the fan speed according to real-time load changes in each zone, achieving stepless continuous adjustment of the air volume in a single zone. This structure abandons the traditional segmented, gear-based air supply adjustment method, enabling dynamic and smooth fine-tuning of air volume for minor load fluctuations in each zone, achieving precise real-time matching between the air supply output and the actual operating conditions of the zone. It effectively overcomes the shortcomings of traditional air supply adjustment, such as low precision, delayed adaptation to operating conditions, and large fluctuations in gear switching, significantly improving the precision and stability of zoned air supply control, avoiding environmental fluctuations and ineffective energy consumption caused by frequent sudden changes in air volume, and further enhancing the on-demand air supply capability and overall energy-saving operation effect of the air conditioning system.

[0038] Example 5 In this embodiment, the zone sensing unit is also equipped with an outdoor meteorological sensor. The outdoor meteorological sensor collects outdoor temperature, outdoor humidity, and outdoor wind speed data, and uploads the collected data to the intelligent control unit for use by the load forecasting model.

[0039] The working principle and beneficial effects of the above technical solution are as follows: Based on the original indoor zoned load perception, outdoor meteorological dimension data is added, enabling the load prediction model to combine indoor and outdoor coupled operating conditions to carry out load prediction. This effectively overcomes the shortcomings of traditional methods that rely solely on indoor parameter control, such as load prediction lag, low prediction accuracy, and single operating condition prediction. It significantly improves the accuracy and foresight of the system's prediction of the changing trends of the plant's heating and cooling loads, allowing the air conditioning control strategy to adapt to environmental changes in advance, avoiding control deviations and energy waste caused by passive system adjustment, and further improving the operational stability and energy-saving control accuracy of the entire air conditioning system.

[0040] Example 6 In this embodiment, all frequency converters in the frequency converter power unit adopt a linkage and coordinated control method; the output power of the chiller unit is dynamically adjusted according to the total cooling and heating load of the plant, and the operating speed of the blower, return air blower and circulating water pump are synchronously matched with the load of the chiller unit.

[0041] The working principle and beneficial effects of the above technical solution are as follows: The internal variable frequency devices are controlled in a coordinated manner, enabling the chiller unit's output power to dynamically and adaptively adjust to the total cooling and heating load of the plant. Simultaneously, the operating speeds of the supply fan, return fan, and circulating water pump are synchronously adjusted to match the chiller unit's load. This changes the traditional control mode where each power device operates independently with mismatched operating parameters, achieving load linkage and dynamic synchronous adaptation between the cold source equipment and the distribution equipment. This ensures that the system's cooling output and delivery always match the actual load demand. It effectively solves the problems of mismatched operating conditions between the traditional air conditioning distribution end and the cold source end, hydraulic and airflow imbalance, and high local excess energy consumption.

[0042] Example 7 In this embodiment, an energy-saving operation method for an industrial plant air conditioning system based on the device described in any one of Embodiments 1-6 is proposed, comprising the following steps: S1. The zone sensing unit collects the temperature and humidity of each zone of the factory, the on-duty status of personnel, the heat generation data of equipment and outdoor meteorological parameters in real time, and transmits all collected data to the intelligent control unit. S2, the intelligent control unit combines historical operating data, time-period operating parameters and outdoor meteorological data to predict the real-time load and short-term load fluctuation trends of each zone through the built-in load prediction model; S3. The waste heat recovery unit performs a cascade heat exchange process, using the waste heat carried by the factory exhaust to pre-treat the fresh air, reducing the energy consumption required for fresh air temperature and humidity control. S4. The intelligent control unit adjusts the opening degree of the electric air valve and variable air volume air outlet of the corresponding zone according to the heating and cooling load of each zone and the personnel on duty signal. Among them, the personnel operation area and the high load equipment area supply air normally according to the rated load, the air supply volume of the public passage area is reduced, and the air supply path of the idle area is cut off, and only a small amount of return air is maintained to ensure the basic circulation of the pipeline. S5, the intelligent control unit links and regulates the variable frequency power unit, adjusts the operating frequency of the variable frequency chiller, variable frequency air supply fan, variable frequency return air fan and variable frequency circulating water pump according to the overall cooling and heating load of the plant, and realizes dynamic matching between system power output and real-time load; S6. Iterate through steps S1 to S5 to continuously and dynamically adjust the operating conditions of each unit to achieve continuous energy-saving operation of the air conditioning system.

[0043] The working principle and beneficial effects of the above technical solution are as follows: By proposing an energy-saving operation method for an industrial plant air conditioning system adapted to the aforementioned energy-saving operation device, multi-dimensional data on the environment, personnel, equipment heat generation, and outdoor weather of each zone of the plant are continuously collected. Combined with historical operating conditions, the load prediction model is used to accurately predict the real-time load and load fluctuation trend of each zone. In addition, the waste heat recovery unit is used to pre-treat fresh air through cascade heat exchange and reduce the basic energy consumption of fresh air. At the same time, the air supply opening of each zone is adjusted according to the load and personnel status of each zone. Normal air supply is provided to the operation and high load areas, the air supply is reduced in the passage area, and the air supply is cut off in the idle area to maintain the basic cycle. The variable frequency power unit is linked to the synchronous frequency conversion of each device to adapt to the overall cooling and heating load. Through multi-step cyclic iteration, the system operating conditions are dynamically updated and continuously controlled. This method establishes a closed-loop energy control logic of "sensing and prediction - waste heat pretreatment - zoned differentiated air supply - power linkage matching", which overcomes the shortcomings of traditional air conditioning operation methods such as passive regulation, single strategy, one-size-fits-all air supply to each zone, and lagging power matching. It achieves energy-saving regulation under all operating conditions, refined and forward-looking, significantly reduces ineffective energy supply and transmission redundancy, and effectively improves the overall operating energy efficiency and energy-saving stability of industrial plant air conditioning systems.

[0044] Example 8 In this embodiment, in step S4, if the human presence sensor detects that the corresponding zone has been unoccupied for a period of time exceeding a preset threshold, the intelligent control unit controls the electric air valve of that zone to be completely shut off, maintaining only the minimum circulating air pressure of the overall air conditioning system.

[0045] The working principle and beneficial effects of the above technical solution are as follows: An unattended delayed shutdown mechanism is added to the zoned air supply control logic. The intelligent control unit can determine the duration of unattended operation in each zone based on real-time detection data from human presence sensors. When the unattended operation time of a zone exceeds a preset threshold, the corresponding zone's electric air valve is automatically shut off completely, retaining only the minimum circulating air pressure required by the entire air conditioning system. This control method accurately identifies ineffective energy supply scenarios by using the personnel on-duty time threshold, achieving proactive and reliable cutoff of air supply to idle zones. Simultaneously, by retaining the minimum system air pressure, it avoids problems such as air pressure imbalance, temperature and humidity fluctuations, and frequent equipment start-ups and shutdowns caused by a complete pipeline shutdown. This effectively overcomes the shortcomings of traditional air conditioning systems that continue to supply air during unattended periods, resulting in significant energy consumption. It further refines the energy-saving control strategy under unattended conditions, minimizing ineffective energy consumption in unattended areas of the factory while ensuring the overall stable operation of the air conditioning system, thus improving the system's refined energy-saving management level.

[0046] Example 9 In this embodiment, in step S3, when the outdoor ambient temperature is lower than the factory exhaust temperature, the first-stage plate heat exchanger is activated to preheat the fresh air; when the factory generates excess waste heat, the second-stage waste heat storage component is activated to store the waste heat, and the stored waste heat is released at night or under low-temperature conditions to assist the air conditioning in temperature regulation.

[0047] The working principle and beneficial effects of the above technical solution are as follows: A differentiated tiered waste heat utilization strategy is implemented based on outdoor environmental conditions and the waste heat status of the factory. When the outdoor temperature is lower than the factory exhaust temperature, the first-stage plate heat exchanger is activated to preheat the fresh air using exhaust waste heat. Simultaneously, when there is excess waste heat in the factory, the second-stage waste heat storage components complete waste heat energy storage, and the stored waste heat is released at night or under low-temperature conditions to assist the air conditioning in temperature regulation and pre-treatment of fresh air. This embodiment realizes on-demand recovery, peak-shifting storage, and time-sharing utilization of waste heat, effectively solving the problems of poor adaptability to operating conditions, inability to store waste heat, direct waste of excess waste heat, and high fresh air load at low temperatures and nighttime in traditional waste heat recovery models. It fully explores the utilization value of exhaust waste heat, significantly reduces the heating load of the air conditioning unit during low-temperature periods, and further improves the waste heat utilization rate and energy-saving operation stability of the air conditioning system under all seasons and operating conditions.

[0048] Example 10 In this embodiment, in step S5, the intelligent control unit has a built-in peak and valley power consumption control strategy; during peak power consumption periods, the unit's operating load is reduced first, and the thermal storage components are called to release stored heat simultaneously; during off-peak power consumption periods, the unit's operating efficiency is improved, and the surplus heat is used to complete the thermal storage medium's heat storage.

[0049] The working principle and beneficial effects of the above technical solution are as follows: By further improving the control logic of the variable frequency power unit, a peak-valley power consumption control strategy is added to the intelligent control unit. Based on the characteristics of the power grid during peak hours, the system's operating mode is matched: During peak power consumption periods, the air conditioning unit's operating load is actively reduced, while the secondary heat storage components release existing waste heat to assist in fresh air temperature regulation, compensating for the unit's output shortfall; during off-peak power consumption periods, the unit's operating efficiency and output margin are appropriately increased, and the system's surplus heat is used to store heat and energy in the heat storage medium. This solution achieves deep linkage between air conditioning operation and the peak-valley load of the power grid, changing the traditional crude control method of fixed air conditioning operation without distinguishing between electricity price periods. It effectively avoids the problems of high electricity prices and high energy consumption during peak hours, fully utilizes surplus electricity and waste heat resources during off-peak hours for energy storage and backup, significantly reduces the electricity cost of factory air conditioning and the pressure of peak power grid load, and further improves the system's economy and energy-saving adaptability under all operating conditions.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving operation device for an industrial plant air conditioning system, characterized in that, It includes a zone sensing unit, a waste heat recovery unit, a zone air supply regulation unit, a variable frequency power unit, and an intelligent control unit; The zone sensing unit is deployed in each functional zone of the industrial plant and includes temperature and humidity sensors, human presence sensors and infrared thermal imaging acquisition modules, which are used to collect environmental parameters, personnel on-duty status and equipment heat load data of each zone in real time. The waste heat recovery unit is connected to the factory exhaust duct and the air conditioning fresh air duct respectively. It includes a primary air-to-air heat exchange component and a secondary waste heat storage component. It is used to recover the equipment waste heat and environmental waste heat carried by the factory exhaust in stages, and to use the recovered waste heat to preheat or precool the air conditioning fresh air. The zoned air supply regulation unit is equipped with electric air valves, variable air volume air supply outlets and zoned return air outlets for each functional zone of the plant. Each zone independently constructs an air supply circuit, which is used to adaptively adjust the air supply volume and air supply operation status according to the real-time load of each zone. The variable frequency power unit includes a variable frequency chiller, a variable frequency air supply fan, a variable frequency return air fan, and a variable frequency circulating water pump. Each device in the variable frequency power unit is connected to the main air conditioning pipeline and the air supply circuit of each zone. The intelligent control unit is communicatively connected to the zone sensing unit, waste heat recovery unit, zone air supply adjustment unit, and variable frequency power unit. The intelligent control unit has a built-in load prediction model and energy-saving control logic, which can coordinate and unify the control of each functional unit according to the real-time collected field data, outdoor meteorological data, and preset operating conditions to achieve energy-saving operation of the air conditioning system.

2. The energy-saving operation device for an industrial plant air conditioning system according to claim 1, characterized in that, The industrial plant is divided into equipment heat generation area, personnel operation area, public passage area and idle area according to its function. Each area is independently equipped with a set of temperature and humidity sensors, human presence sensors and electric air valves.

3. The energy-saving operation device for an industrial plant air conditioning system according to claim 1, characterized in that, The primary air-to-air heat exchange component is a plate heat exchanger, which is connected in series between the exhaust duct and the fresh air duct to achieve initial temperature and humidity control of the fresh air using the waste heat from the exhaust. The secondary waste heat storage component is connected to the waste heat output end of the plate heat exchanger and is filled with a phase change heat storage medium to store excess waste heat and release heat to the outside under low-load conditions of the air conditioner.

4. The energy-saving operation device for an industrial plant air conditioning system according to claim 1, characterized in that, The variable air volume air outlet is equipped with a wind speed regulating motor and guide vanes; the intelligent control unit adjusts the opening of the guide vanes and the operating speed of the fan to achieve stepless continuous adjustment of the air volume of a single zone.

5. The energy-saving operation device for an industrial plant air conditioning system according to claim 1, characterized in that, The zone sensing unit is also equipped with an outdoor meteorological sensor, which collects outdoor temperature, outdoor humidity and outdoor wind speed data, and uploads the collected data to the intelligent control unit for use by the load forecasting model.

6. The energy-saving operation device for an industrial plant air conditioning system according to claim 1, characterized in that, All frequency converters in the variable frequency power unit adopt a linkage and coordinated control mode; the output power of the chiller unit is dynamically adjusted according to the total cooling and heating load of the plant, and the operating speed of the blower, return air blower and circulating water pump are synchronously matched with the load of the chiller unit.

7. An energy-saving operation method for an industrial plant air conditioning system based on the apparatus according to any one of claims 1 to 6, characterized in that, It includes the following steps: S1. The zone sensing unit collects the temperature and humidity of each zone of the factory, the on-duty status of personnel, the heat generation data of equipment and outdoor meteorological parameters in real time, and transmits all collected data to the intelligent control unit. S2, the intelligent control unit combines historical operating data, time-period operating parameters and outdoor meteorological data to predict the real-time load and short-term load fluctuation trends of each zone through the built-in load prediction model; S3. The waste heat recovery unit performs a cascade heat exchange process, using the waste heat carried by the factory exhaust to pre-treat the fresh air, reducing the energy consumption required for fresh air temperature and humidity control. S4. The intelligent control unit adjusts the opening degree of the electric air valve and variable air volume air outlet of the corresponding zone according to the heating and cooling load of each zone and the personnel on duty signal. Among them, the personnel operation area and the high load equipment area supply air normally according to the rated load, the air supply volume of the public passage area is reduced, and the air supply path of the idle area is cut off, and only a small amount of return air is maintained to ensure the basic circulation of the pipeline. S5, the intelligent control unit links and regulates the variable frequency power unit, adjusts the operating frequency of the variable frequency chiller, variable frequency air supply fan, variable frequency return air fan and variable frequency circulating water pump according to the overall cooling and heating load of the plant, and realizes dynamic matching between system power output and real-time load; S6. Iterate through steps S1 to S5 to continuously and dynamically adjust the operating conditions of each unit to achieve continuous energy-saving operation of the air conditioning system.

8. The energy-saving operation method for an industrial plant air conditioning system according to claim 7, characterized in that, In step S4, if the human presence sensor detects that the corresponding zone has been unoccupied for a period of time exceeding a preset threshold, the intelligent control unit controls the electric air valve of that zone to be completely shut off, maintaining only the minimum circulating air pressure of the overall air conditioning system.

9. The energy-saving operation method for an industrial plant air conditioning system according to claim 7, characterized in that, In step S3, when the outdoor ambient temperature is lower than the factory exhaust temperature, the first-stage plate heat exchanger is started to preheat the fresh air; when the factory generates excess waste heat, the second-stage waste heat storage component is started to store the waste heat, and the stored waste heat is released at night or under low temperature conditions to assist the air conditioning in temperature regulation.

10. The energy-saving operation method for an industrial plant air conditioning system according to claim 7, characterized in that, In step S5, the intelligent control unit has a built-in peak and valley electricity consumption control strategy; during peak electricity consumption periods, the unit's operating load is reduced first, and the thermal storage components are simultaneously called to release stored heat. During periods of low electricity demand in the power grid, the operating efficiency of generating units is improved, and surplus heat is used to complete the heat storage medium's heat storage function.

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