Air handling system integrating direct air trapping module and heating ventilation air conditioning device and control method thereof

Abstract

The invention relates to the technical field of ventilation, in particular to an air treatment system integrating a direct air trapping module and a heating ventilation air conditioning device and a control method of the air treatment system, the system comprises an HVAC module, the HVAC module comprises a fresh air inlet, a filter, a mixing point, a fan, a temperature and humidity adjusting unit and an air supply outlet which are connected in sequence, and the HVAC module further comprises a return air header pipe and an exhaust outlet; and the DAC module is provided with an air inlet, a purified air outlet, a regenerated energy input interface and a CO2 product output port. According to the system provided by the invention, the DAC module and the HVAC are efficiently coupled through wind path coordination and energy coordination, and the target node in the first to fourth nodes is started and adjusted to adjust the air flow direction for different operation modes, so that the dynamic regulation and control of the air flow path are realized, and the capability of improving the indoor air quality of the HVAC module is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of heating and ventilation technology, and in particular to an air treatment system integrating a direct air capture module and a heating, ventilation and air conditioning device and a control method thereof. Background Art

[0002] Currently, mainstream DAC technologies are categorized as solid adsorption (S-DAC) and liquid absorption (L-DAC). However, these technologies often suffer from high energy consumption, high costs, and low efficiency. Given that the CO2 concentration in air is only 0.04%, the capture process requires processing large volumes of air. Furthermore, adsorbent regeneration typically requires high temperatures, resulting in significant energy consumption and limiting its economic viability. Furthermore, existing DAC technologies often operate in a standalone mode, lacking effective integration with existing building infrastructure and hindering the realization of synergistic benefits.

[0003] To address this technical challenge, existing technologies attempt to combine DAC technology with building HVAC systems to improve the system's energy efficiency. However, there is still considerable room for improvement in reducing capture energy consumption, improving system integration, and achieving intelligent control.

[0004] Therefore, there is an urgent need for a new technology solution that can significantly reduce energy consumption and operating costs, improve CO2 capture efficiency, and seamlessly integrate with building HVAC systems to promote the development of DAC technology in a more efficient, economical and practical direction. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide an air treatment system integrating a direct air capture module with a HVAC device and a control method thereof.

[0006] In a first aspect, an embodiment of the present invention provides an air treatment system integrating a direct air capture module with a heating, ventilation and air conditioning device, comprising: The HVAC module includes a fresh air inlet, a filter, a mixing point, a fan, a temperature and humidity control unit, and an air supply outlet, which are connected in sequence. The HVAC module also includes a return air main and an exhaust outlet; DAC module, equipped with air inlet, purified air outlet, regenerative energy input interface and CO2 product output port; The integrated interface unit includes first to fourth nodes, wherein the first node connects the return air main and the air inlet, the second node connects the exhaust outlet and the air inlet, the third node connects the downstream of the mixing point and the air inlet, and the fourth node selectively connects the return air main or the fresh air inlet and the air inlet through a bypass duct; An energy coupling component receives waste heat and / or waste moisture generated by the HVAC module through a regenerative energy input interface for energy regeneration; The control module dynamically selects one or more nodes from the first to fourth nodes based on the sensor data and adjusts the air valve opening.

[0007] In combination with the first aspect, a first air valve is provided on the connecting pipe between the first node and the air inlet, and a second air valve is provided on the connecting pipe between the purified air outlet and the mixing point; When the first air valve is opened, the return air is purified by the DAC module and then returns to the mixing point through the second air valve.

[0008] In combination with the first aspect, a third air valve is provided on the connecting pipe between the second node and the air inlet, and a fourth air valve is provided on the connecting pipe between the purified air outlet and the exhaust port; When the third air valve and the fourth air valve are opened, the exhaust air is purified by the DAC module and then discharged directly through the fourth air valve.

[0009] In combination with the first aspect, a fifth air valve is provided on the connecting pipe between the third node and the air inlet, and a sixth air valve is provided on the connecting pipe between the purified air outlet and the fan; When the fifth air valve is opened, the mixed air is purified by the DAC module and then sent to the fan inlet through the sixth air valve.

[0010] In combination with the first aspect, a seventh air valve is provided on the connecting pipe between the fourth node and the air inlet, and an eighth air valve is provided on the connecting pipe between the purified air outlet and the mixing point; When the seventh air valve is opened, the bypass airflow is purified by the DAC module and then sent back to the mixing point or designated area through the eighth air valve.

[0011] In conjunction with the first aspect, the energy coupling component includes: The heat recovery unit is used to collect waste heat generated by the HVAC module during operation and external supplementary heat sources, and introduce the collected heat into the DAC module for adsorbent regeneration; The humidity coupling unit transports the condensed water generated by the surface cooler to the regenerative energy input interface.

[0012] In combination with the first aspect, the DAC module uses an amine-based solid adsorbent, has a regeneration temperature range of 80-120°C, and receives 60-80°C hot air from the condenser through a regeneration energy input interface.

[0013] In a second aspect, embodiments of the present application further provide a control method for an air treatment system integrating a direct air capture module with a heating, ventilation, and air conditioning device. The method is applied to a control module in the above-mentioned system, and the method includes: Get current running data; Determine a target node among the first to fourth nodes based on current operation data and a current operation mode; Control the air valve corresponding to the target node to open, so as to guide the air flow through the DAC module for CO2 capture; Among them, the current operating mode is one of indoor air quality priority mode, carbon capture priority mode, energy saving priority mode, and local processing mode.

[0014] In combination with the second aspect, the current operating mode is the indoor air quality priority mode, and the current operating data includes the CO2 concentration data of the indoor space; The step of determining a target node among the first to fourth nodes based on current operation data and a current operation mode includes: If the CO2 concentration data of the indoor space is higher than a first preset threshold, the first node or the third node is determined as the target node.

[0015] In conjunction with the second aspect, the current operating mode is carbon capture priority mode; The step of determining a target node among the first to fourth nodes based on current operation data and a current operation mode includes: If the current period is a non-occupied building period and / or a period of low electricity prices, the second node is used as the target node.

[0016] Combined with the second aspect, the current operating mode is energy-saving priority mode; The step of determining a target node among the first to fourth nodes based on current operation data and a current operation mode includes: If the current period is a transitional season in which the indoor and outdoor temperature and humidity deviations are less than the threshold and the cooling and heating loads are small, the third node is used as the target node.

[0017] In combination with the second aspect, the current operation mode is the local processing mode; the current operation data is the CO2 concentration data of the indoor space; The step of determining a target node among the first to fourth nodes based on current operation data and a current operation mode includes: For each area of ​​the indoor space, calculate the absolute value of the difference between the current CO2 concentration in the area and the average CO2 concentration to obtain the CO2 concentration difference corresponding to the area; If there is a CO2 concentration difference greater than a preset threshold, the fourth node is used as the target node.

[0018] The embodiments of the present invention bring the following beneficial effects: The present application provides an air treatment system integrating a direct air capture module and a heating, ventilation and air conditioning device and a control method thereof, the system comprising: an HVAC module, comprising a fresh air inlet, a filter, a mixing point, a fan, a temperature and humidity adjustment unit and an air supply outlet connected in sequence, the HVAC module also comprising a return air main and an exhaust outlet; a DAC module, provided with an air inlet, a purified air outlet, a regeneration energy input interface and a CO2 product output outlet; an integrated interface unit, comprising first to fourth nodes, the first node connecting the return air main and the air inlet, the second node connecting the exhaust outlet and the air inlet, the third node connecting the downstream of the mixing point and the air inlet, and the fourth node selectively connecting the return air main or the fresh air inlet and the air inlet through a bypass air duct; an energy coupling component, receiving the waste heat and / or waste moisture generated by the HVAC module through the regeneration energy input interface for energy regeneration; a control module, dynamically selecting one or more nodes from the first to fourth nodes based on sensor data and adjusting the air valve opening.

[0019] The method provided in this application efficiently couples the DAC module with the HVAC through air path coordination and energy coordination. By opening and adjusting the target nodes among the first to fourth nodes, the air flow direction is adjusted for different operating modes to achieve dynamic regulation of the airflow path, thereby enhancing the ability of the HVAC module to improve indoor air quality and creating the possibility of resource utilization of CO2. It provides a practical and feasible technical path for achieving an efficient, energy-saving, and active carbon removal building environment control system, which is of great significance to promoting deep decarbonization and sustainable development in the construction field.

[0020] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the working principle of an air treatment system integrating a direct air capture module and a HVAC device according to an embodiment of the present invention; Figure 2 A schematic diagram of a control method for an air treatment system integrating a direct air capture module and a HVAC device according to an embodiment of the present invention; Figure 3 A schematic diagram of an electronic device provided by an embodiment of the present invention.

[0024] Reference numerals: 130 - processor, 131 - memory, 132 - bus, 133 - communication interface. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0026] To facilitate understanding of this embodiment, the following is a brief introduction to the technical terms used in this application.

[0027] Direct Air Capture (DAC), a cutting-edge technology for actively removing CO2 from the air, was initially applied primarily to large-scale carbon removal to combat climate change. However, researchers have gradually recognized the potential of DAC technology for small-scale, distributed applications, particularly in improving indoor air quality and enhancing building energy efficiency. Integrating DAC modules with HVAC modules to capture CO2 from indoor air can theoretically significantly reduce the amount of fresh air required for CO2 dilution, thereby significantly reducing HVAC energy consumption.

[0028] After introducing the technical terms involved in this application, the application scenarios and design concepts of the embodiments of this application are briefly introduced.

[0029] Although existing technologies provide technical means to combine DAC technology with building HVAC systems, there is still much room for improvement in terms of how to reduce capture energy consumption, improve system integration, and achieve intelligent control.

[0030] Based on this, an embodiment of the present application provides an air treatment system integrating a direct air capture module and a HVAC device and a control method thereof.

[0031] Example 1 The present application provides an air treatment system integrating a direct air capture module and a heating, ventilation and air conditioning device, the system comprising: an HVAC module, a DAC module, an integrated interface unit, an energy coupling component and a control module.

[0032] The HVAC module includes a fresh air inlet, a filter, a mixing point, a fan, a temperature and humidity adjustment unit and an air supply outlet which are connected in sequence. The HVAC module also includes a return air main duct and an exhaust outlet.

[0033] The DAC module is equipped with an air inlet, a purified air outlet, a regenerative energy input interface and a CO2 product output port.

[0034] The integrated interface unit includes first to fourth nodes, the first node connects the return air main duct and the air inlet, the second node connects the exhaust outlet and the air inlet, the third node connects the downstream of the mixing point and the air inlet, and the fourth node selectively connects the return air main duct or the fresh air inlet and the air inlet through a bypass duct.

[0035] The energy coupling component receives the waste heat and / or waste moisture generated by the HVAC module through the regenerative energy input interface for energy regeneration.

[0036] The control module dynamically selects one or more nodes from the first to fourth nodes based on the sensor data and adjusts the air valve opening.

[0037] This application achieves flexible switching between different operating modes by implementing a multi-node interface and bypass duct structure, combined with a dynamic damper adjustment mechanism. It also establishes an energy coupling pathway to transfer low-grade waste heat from the HVAC module to the DAC module for regeneration, significantly reducing system energy consumption. This not only improves CO2 capture efficiency, but also balances indoor air quality improvement with efficient energy utilization, offering multiple advantages such as environmental protection, energy conservation, and automated control.

[0038] The HVAC module is equipped with an air handling circuit and a return air and exhaust air circuit. Specifically, in the air handling circuit, outdoor air is introduced from the fresh air inlet, passes through a primary or secondary filter to remove particulate matter, and then enters the mixing point to mix with the partially circulated return air. The mixed air is driven by a fan and passes through a temperature and humidity control unit (combined with a Figure 1 After temperature and humidity are regulated by the surface cooling coil and heating coil (shown in the figure), the air meeting the requirements is delivered to the indoor space through the air supply outlet. In the return and exhaust air circuits, indoor air is collected at the return air outlet of the return air main and purified by the return air filter. A portion is returned to the mixing point for recycling, while the remaining portion flows directly to the exhaust outlet of the return air main and is discharged outdoors according to the operating mode requirements.

[0039] In the DAC module, the air to be treated enters the DAC unit from the air inlet (not shown in the figure), and the CO2 contained in the air is selectively adsorbed by the internal CO2 adsorbent. The purified air is discharged through the purified air outlet (not shown in the figure) and enters the ventilation system or is directly released into the environment.

[0040] After the adsorbent reaches saturation, the system switches to the regeneration phase. Figure 1 The energy coupling component shown receives waste heat, excess moisture, or external low-grade energy from the HVAC module through a regeneration energy input interface (not shown). After regeneration, it outputs high-energy energy to power the DAC unit, heating the adsorbent to release the captured CO2. The high-concentration CO2 produced in this process is discharged from the CO2 product output port (not shown) and transported to subsequent treatment (such as storage, utilization, or discharge). Simultaneously, the waste gas (containing some water vapor and heat) generated during the regeneration process is discharged through the "regeneration waste gas outlet." To improve energy efficiency, the system incorporates a heat exchanger or full heat exchanger to preheat the regeneration airflow entering the DAC unit or the fresh air entering the HVAC module, thereby reducing overall energy consumption. Furthermore, the energy coupling component manages the source of energy required for regeneration (such as HVAC waste heat or external energy) and the ultimate destination of the captured CO2 (utilization, storage, or discharge), achieving optimal resource allocation and energy recycling.

[0041] As you can understand, the system incorporates temperature and humidity sensors, CO2 concentration sensors, and PM2.5 detectors to collect data on indoor air quality (such as CO2 concentration and pollutant content) and heat and humidity loads, serving as a basis for adjusting the ratio of fresh air to return air. The control module uses this data to adjust the damper opening. For example, when indoor air quality is good and the load is low, the return air ratio is increased to reduce the energy required for fresh air processing. When CO2 concentrations rise or pollutants increase, the fresh air ratio is increased to improve air quality. In extreme outdoor weather conditions, the fresh air ratio is appropriately reduced to reduce the air conditioning load. Through the coordinated operation of these modules, the ratio of fresh air, return air, and exhaust air is flexibly adjusted according to indoor load and environmental conditions, achieving the optimal goals of energy conservation and air quality control.

[0042] As an implementable method, the temperature and humidity adjustment unit includes a surface cooling coil, a heating coil, and a humidification or dehumidification module (not shown in the figure) connected in sequence, so as to first cool down and dehumidify, then heat up, and finally accurately adjust the humidity to improve energy efficiency and meet indoor air needs.

[0043] In combination with the first aspect, a first air valve is provided on the connecting pipe between the first node and the air inlet, and a second air valve is provided on the connecting pipe between the purified air outlet and the mixing point; when the first air valve is opened, the return air is purified by the DAC module and then returns to the mixing point through the second air valve. Figure 1As shown, the first node (P1) is connected to the return air main (including Figure 1 The first air valve (V1) and the second air valve (V2) are connected to the air inlet of the DAC module through a pipeline. A first air valve (marked V1 in the figure) is provided on the connecting pipeline between the first node and the air inlet. When the first air valve is opened, part or all of the return air in the HVAC module is diverted to the DAC module. After air purification, it is discharged along the purified air outlet through the opened second air valve (marked V2 in the figure) to the mixing point to mix with the purified fresh air. It can be understood that by coordinating the opening or closing of the first air valve (V1) and the second air valve (V2), it is possible to accurately control whether the return air enters the DAC module for CO2 purification according to actual operating requirements, and determine whether the purified air returns to the mixing point for recirculation. This precise airflow guidance mechanism improves the controllability and flexibility of the system.

[0044] Specifically, when the first damper (V1) opens, a portion of the return air is directed into the DAC module for efficient CO2 removal and air purification. It then passes through the second damper (V2) and returns to the mixing point, where it mixes with fresh air before being re-introduced into the indoor space. This process effectively reduces CO2 concentrations and harmful pollutants in the indoor air, significantly improving indoor air quality. It is particularly suitable for environments with long periods of closed operation or dense crowds.

[0045] The presence of dampers provides the system with excellent modular isolation capabilities. When the DAC module requires maintenance or adsorbent replacement, it can be isolated from the main airflow by closing the first damper (V1). This does not affect the basic operational functions of the HVAC module, improving system reliability and maintainability. Furthermore, based on the configuration of the first and second dampers, the system can flexibly switch between multiple operating modes. Specifically, when indoor air quality is good, the return air ratio is appropriately increased and the first damper (V1) is closed to reduce the amount of fresh air processed, implementing energy-saving mode. When elevated CO2 concentrations or excessive pollutants are detected, the first damper (V1) is opened to allow more return air to pass through the DAC module before returning to the mixing point, prioritizing purification mode. In extreme weather conditions or sudden changes in air quality, the opening of the first and second dampers (V1) is adjusted to quickly adjust the fresh air to return air ratio, ensuring system response speed and regulation accuracy.

[0046] In combination with the first aspect, a third air valve is provided on the connecting pipe between the second node and the air inlet, and a fourth air valve is provided on the connecting pipe between the purified air outlet and the exhaust port; When the third air valve is opened, the exhaust air is purified by the DAC module and then discharged directly through the fourth air valve.

[0047] Combine Figure 1As shown, the second node (marked P2 in the figure) is arranged in the return air duct near the exhaust port, and a third air valve (marked V3 in the figure) is provided on the connecting pipe between the second node (P2) and the air inlet of the DAC module, and a fourth air valve (marked V4 in the figure) is provided on the connecting pipe between the purified air outlet and the exhaust port. When the third air valve (V3) and the fourth air valve (V4) are opened, part or all of the filtered return air is diverted to the DAC module for adsorption purification and then discharged.

[0048] In combination with the first aspect, a fifth air valve is provided on the connecting pipe between the third node and the air inlet, and a sixth air valve is provided on the connecting pipe between the purified air outlet and the fan; When the fifth air valve is opened, the mixed air is purified by the DAC module and then sent to the fan inlet through the sixth air valve.

[0049] Similarly, the third node (P3 in the figure) connects the downstream of the mixing point with the DAC module, and a fifth air valve (V5 in the figure) is provided on the connecting pipe. The fifth air valve is opened to divert part or all of the mixed air to the DAC module; the sixth air valve (V6 in the figure) is opened to divert the adsorbed purified gas to the fan, and then the gas is sent into the indoor space after temperature and humidity adjustment.

[0050] In combination with the first aspect, a seventh air valve is provided on the connecting pipe between the fourth node and the air inlet, and an eighth air valve is provided on the connecting pipe between the purified air outlet and the mixing point; When the seventh air valve is opened, the bypass airflow is purified by the DAC module and then sent back to the mixing point or designated area through the eighth air valve.

[0051] Combine Figure 1 As shown, the fourth node (combined with the mark P4) is located on the connecting pipe between the return air outlet and the fresh air inlet of the return air main, and the connecting pipe between the fourth node and the air inlet is provided with a seventh air valve (combined with the mark V7). Opening the seventh air valve (V7) can partially or completely guide the mixed gas of fresh air and return air to the DAC module.

[0052] In combination with the first aspect, the energy coupling component includes: a heat recovery unit, a humidity coupling unit and an energy recovery submodule.

[0053] The heat recovery unit is connected to collect waste heat generated by the HVAC module during operation and an external supplementary heat source, and to introduce the collected heat into the DAC module for adsorbent regeneration.

[0054] Specifically, the heat recovery unit's first end is connected to the condenser and surface cooler within the HVAC module's temperature and humidity control unit. The other end is connected to the regenerative energy input port of the DAC module, recovering waste heat generated during HVAC module operation to heat the adsorbent within the DAC module, releasing CO2. This end can also be connected to a solar collector or ground-source heat pump to introduce renewable energy as a supplemental heat source, reducing the system's reliance on external energy when external environmental conditions are favorable.

[0055] The first end of the humidity coupling unit is connected to the air supply port, and the second end is connected to the DAC module. It is used to introduce low-temperature and low-humidity air into the DAC module during the adsorption stage to regulate the humidity of the gas in the DAC module and optimize the adsorption or desorption process.

[0056] Furthermore, the first end can also be connected to the condenser inside the temperature and humidity control unit in the HVAC module or the outdoor high-humidity air to provide moisture during the analysis stage, reduce the temperature required for analysis, and improve the regeneration efficiency.

[0057] The first end of the energy recovery submodule is connected to the regeneration exhaust gas outlet of the DAC module, and the second end is connected to the heat exchanger or full heat exchanger, which is used to collect the available energy in the high-temperature and high-humidity exhaust gas discharged during the regeneration process, and use the recovered energy to preheat the regeneration airflow or fresh air to reduce the need for additional heating.

[0058] The energy coupling assembly provided in this application achieves a multi-dimensional, closed-loop energy regeneration mechanism by rationally configuring a heat recovery unit, a humidity coupling unit, and an energy recovery subsystem, and tightly connecting them with the HVAC module's temperature and humidity control unit, condenser, surface cooler, external renewable energy equipment, and DAC module. This integrated design not only enhances the sustainability of the CO2 capture system but also provides an innovative technical path for the energy-saving and intelligent development of building ventilation systems.

[0059] In combination with the first aspect, the DAC module uses an amine-based solid adsorbent, has a regeneration temperature range of 80-120°C, and receives 60-80°C hot air from the condenser through a regeneration energy input interface.

[0060] In a second aspect, an embodiment of the present application provides a control method for an integrated device of a direct air capture module and a heating, ventilation and air conditioning system, and the method is applied to a control module in the above-mentioned system.

[0061] Combine Figure 2 As shown, the method includes: S110, obtaining current operation data.

[0062] S120 : Determine a target node among the first to fourth nodes based on current operation data and a current operation mode.

[0063] S130 , controlling the air valve corresponding to the target node to open, so as to guide the air flow through the DAC module to capture CO2.

[0064] Among them, the current operating mode is one of indoor air quality priority mode, carbon capture priority mode, energy saving priority mode, and local processing mode.

[0065] Among them, the current operating data is collected by sensors and transmitted to the control module. The sensors are installed at key nodes of the HVAC module (such as fresh air inlet, return air inlet, supply air inlet, indoor, etc.) and the DAC system (such as inlet and outlet) to measure the CO2 concentration value in the airflow.

[0066] The method proposed in this paper collects CO2 concentration data from key nodes in the HVAC and DAC modules in real time, dynamically selects target nodes, and controls the opening of corresponding dampers to guide airflow through the DAC module for efficient CO2 capture. This method supports adaptive switching between three operating modes: prioritizing indoor air quality, carbon capture, and energy conservation, enhancing the system's flexibility and applicability. Through intelligent control, not only is carbon capture efficiency optimized, but energy recovery and airflow management are also synergistically optimized, enhancing the overall stability, safety, and energy efficiency of the system, providing technical support for the widespread application of carbon capture technology in building ventilation systems.

[0067] In combination with the second aspect, the current operating mode is the indoor air quality priority mode, and the current operating data includes CO2 concentration data of the indoor space.

[0068] Step S120 includes: S121a: If the CO2 concentration data of the indoor space is higher than a first preset threshold, determine the first node or the third node as the target node.

[0069] At this point, the indoor CO2 concentration is too high, and reducing it is a priority. Specifically, the measures taken include opening the first damper (V1) corresponding to the first node (P1) to direct the return air to the DAC unit for CO2 adsorption and collection. The return air is then passed through the second damper (V2) to the mixing point, where it is mixed with fresh air before being introduced into the room, thereby reducing the CO2 concentration in the mixed airflow entering the room. Alternatively, the fifth damper (V5) corresponding to the third node (P3) is opened to direct the mixed airflow to the DAC module to reduce the CO2 concentration in the mixed airflow. The mixed airflow is then transported to the indoor space through the sixth damper (V6) by the fan, thereby reducing the CO2 concentration in the incoming airflow.

[0070] In this embodiment, the first preset threshold is 800 ppm.

[0071] In conjunction with the second aspect, after step S110, the method further includes: S111a: If the CO2 concentration data of the indoor space is lower than the second preset threshold, the DAC module is controlled to suspend or reduce power operation.

[0072] The second preset threshold is smaller than the first preset threshold.

[0073] If the indoor CO2 concentration falls below a second preset threshold, it indicates good indoor air quality and low carbon capture demand. By controlling the DAC module to reduce power or suspend operation, this effectively reduces unnecessary energy consumption and equipment wear, thereby improving overall system energy efficiency. By preventing the DAC module from operating at high load during periods of low demand, this control logic helps reduce equipment wear and aging, extending its service life and reducing maintenance frequency and costs. In this embodiment, the second preset threshold is 600 ppm.

[0074] By setting two different preset thresholds (the first triggers the DAC module to start, the second controls its frequency reduction or shutdown), the system enables more refined operational management. This hierarchical control strategy not only improves the system's adaptability to environmental changes but also optimizes the device's start-up and shutdown frequency and operating intensity while maintaining indoor air quality.

[0075] As can be understood, as an example, this mode can be applied during daytime business hours when occupants are present in a building and the indoor CO2 concentration has risen to an uncomfortable level (e.g., greater than a first preset threshold of 800 ppm), necessitating improvement of indoor air quality. In this case, the first damper (V1) corresponding to the first node (P1) is fully opened, directing all return air to the DAC module. The air is captured by the adsorbent in the adsorbent bed before being directed through the second damper (V2) to the mixing point, where it is mixed with fresh air before being delivered to the indoor space. During this process, the fan speed is maintained at 60–80%, and the CO2 concentration of the incoming air is monitored in real time. When the CO2 concentration in the indoor air drops below a second preset threshold of 600 ppm, the opening of the first damper V1 is proportionally reduced (linearly from 0 to 100%) to save energy. If the incoming air CO2 concentration remains below 600 ppm for a sustained period, the P1 mode is completely closed, restoring the normal return air ratio.

[0076] Secondly, the current operating mode is carbon capture-first mode; Step S120 includes: S121b: If the current time period is a building non-occupied time period and / or a period of low electricity prices, the second node is used as the target node.

[0077] When operating in carbon capture priority mode, if the electricity price is low, the third and fourth air valves corresponding to the second node are activated, and direct air capture of carbon dioxide is performed during the low electricity price period, thereby minimizing the overall cost; during the non-occupied period of the building, when energy demand is low, the third and fourth air valves corresponding to the second node are activated, which can perform carbon capture operations more efficiently without affecting normal building use.

[0078] For example, this mode is suitable for applications where reducing or achieving carbon reduction or a "negative" building contribution is a goal, especially during periods of low electricity consumption at night or when the building is unoccupied. In this mode, exhaust air is prioritized for delivery to the DAC module, maximizing CO2 capture. During this process, the opening of the third air valve (V3) is adjusted based on the CO2 capture rate and adsorbent status. This mode is disabled if insufficient external energy is detected or if the daily cumulative target is reached.

[0079] In combination with the second aspect, the current operating mode is the energy-saving priority mode; the current operating data includes outdoor environmental parameters and indoor environmental parameters.

[0080] Step S120 includes: S121c: If the current period is a transitional season in which the indoor and outdoor temperature and humidity deviations are less than the threshold and the cooling and heating loads are small, the third node is used as the target node.

[0081] When operating in energy-saving priority mode and detecting that the outdoor and indoor environmental parameters are similar, the control module chooses to start the third node to minimize the amount of fresh air introduced while processing the mixed wind.

[0082] This mode is suitable for transitional seasons such as spring and autumn when the difference between indoor and outdoor temperature and humidity is below the threshold and the cooling and heating load is low. It is used to minimize fresh air processing energy consumption while maintaining IAQ. By intercepting part of the return air and fresh air through the mixing point and entering the DAC module, it not only maintains the CO2 level but also reduces the cooling, heating, humidification and dehumidification load of the HVAC module. As an example: When the outdoor temperature and humidity deviation is less than the indoor threshold (such as in spring and autumn), the cooling and heating loads are low. In this situation, it is necessary to ensure IAQ while minimizing fresh air processing energy consumption. The fifth damper (V5) corresponding to the third node (P3) is controlled to open, typically at a degree of 30%-70%, to direct the mixed flow of fresh air and return air into the DAC module. This flow is then directed through the sixth damper (V6) to the fan, the temperature and humidity control module, and the air outlet for delivery to the indoor space. This mode is maintained when both the fresh air ratio and the mixed air CO2 concentration meet IAQ requirements and the cooling and heating loads are minimized. If the outside temperature difference is excessive or the CO2 concentration suddenly increases, the system returns to the indoor air quality priority mode or a partial air quality mode.

[0083] In combination with the second aspect, the current operating mode is the local processing mode; the current operating data is the CO2 concentration data of the indoor space.

[0084] Step S120 includes: S121d, for each area of ​​the indoor space, calculate the absolute value of the difference between the current CO2 concentration of the area and the average CO2 concentration to obtain the CO2 concentration difference corresponding to the area; S121e: If there is a CO2 concentration difference greater than a preset threshold, the fourth node is used as the target node.

[0085] This mode is used in areas with localized high CO2 pollution sources (such as conference rooms, laboratories, and classrooms), or in renovation / testing projects where duct modification is limited, requiring targeted and flexible extraction and purification of air from specific areas before return. In this case, the seventh air valve (V7) corresponding to the fourth node (P4) is opened to a 20%-50% opening, allowing fresh air, return air, or mixed air to flow into the DAC module and then be sent back to the mixing point through the eighth air valve (V8) or directly to the air supply terminal in the target area, achieving precise control of local CO2 concentration.

[0086] In a third aspect, the present application provides an electronic device, Figure 3 As shown, the electronic device includes a memory 131 and a processor 130. The memory 131 is used to store computer programs, and the processor 130 runs the computer programs to enable the electronic device to perform the above method.

[0087] Further, combined with Figure 3 The electronic device shown further includes a bus 132 and a communication interface 133 , and the processor 130 , the communication interface 133 and the memory 131 are connected via the bus 132 .

[0088] The memory 131 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is achieved through at least one communication interface 133 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 132 may be an ISA bus, a PCI bus, or an EISA bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0089] The processor 130 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 130 or by software instructions. The processor 130 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in memory 131, and processor 130 reads information in memory 131 and, in conjunction with its hardware, completes the steps of the method of the aforementioned embodiment.

[0090] In a fourth aspect, an embodiment of the present application provides a readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and executed by a processor, the above-mentioned method is executed.

[0091] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0092] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0093] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0094] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air handling system integrating a direct air capture module with a HVAC device, characterized in that: include: An HVAC module includes a fresh air inlet, a filter, a mixing point, a fan, a temperature and humidity adjustment unit, and an air supply outlet connected in sequence, and the HVAC module also includes a return air main and an exhaust outlet; DAC module, equipped with air inlet, purified air outlet, regenerative energy input interface and CO2 product output port; The integrated interface unit includes first to fourth nodes, wherein the first node connects the return air main and the air inlet, the second node connects the exhaust port and the air inlet, the third node connects the downstream of the mixing point and the air inlet, and the fourth node selectively connects the return air main or the fresh air inlet and the air inlet via a bypass duct; an energy coupling component, receiving waste heat and / or waste moisture generated by the HVAC module through the regenerative energy input interface for energy regeneration; The control module dynamically selects one or more nodes from the first to fourth nodes based on sensor data and adjusts the air valve opening.

2. The system according to claim 1, wherein: A first air valve is provided on the connecting pipe between the first node and the air inlet, and a second air valve is provided on the connecting pipe between the purified air outlet and the mixing point; When the first air valve is opened, the return air is purified by the DAC module and then returns to the mixing point through the second air valve.

3. The system according to claim 1, wherein: A third air valve is provided on the connecting pipe between the second node and the air inlet, and a fourth air valve is provided on the connecting pipe between the purified air outlet and the exhaust port; When the third air valve and the fourth air valve are opened, the exhaust air is purified by the DAC module and then directly discharged through the fourth air valve.

4. The system according to claim 1, wherein: A fifth air valve is provided on the connecting pipe between the third node and the air inlet, and a sixth air valve is provided on the connecting pipe between the purified air outlet and the fan; When the fifth air valve is opened, the mixed air is purified by the DAC module and then delivered to the fan inlet through the sixth air valve.

5. The system according to claim 1, wherein: A seventh air valve is provided on the connecting pipe between the fourth node and the air inlet, and an eighth air valve is provided on the connecting pipe between the purified air outlet and the mixing point; When the seventh air valve is opened, the bypass airflow is purified by the DAC module and then sent back to the mixing point or the designated area through the eighth air valve.

6. The system according to claim 1, wherein: The energy coupling component includes: The heat recovery unit is used to collect waste heat generated by the HVAC module during operation and external supplementary heat sources, and introduce the collected heat into the DAC module for adsorbent regeneration; The humidity coupling unit transmits the condensed water generated by the surface cooler to the regenerative energy input interface.

7. The system according to claim 1, wherein: The DAC module uses an amine-based solid adsorbent, has a regeneration temperature range of 80-120°C, and receives 60-80°C hot air from a condenser through a regeneration energy input interface.

8. A method for controlling an air handling system integrating a direct air capture module with a HVAC device, characterized in that: The method is applied to a control module in a system according to any one of claims 1 to 7, and the method includes: Get current running data; Determining a target node among the first to fourth nodes based on the current operation data and the current operation mode; Controlling the air valve corresponding to the target node to open, so as to guide the airflow through the DAC module for CO2 capture; The current operating mode is one of an indoor air quality priority mode, a carbon capture priority mode, an energy saving priority mode, and a local processing mode.

9. The method according to claim 8, characterized in that The current operation mode is the indoor air quality priority mode, and the current operation data includes CO2 concentration data of the indoor space; The step of determining a target node among the first to fourth nodes based on the current operating data and the current operating mode includes: If the CO2 concentration data of the indoor space is higher than a first preset threshold, the first node is determined to be the target node.

10. The method according to claim 8, characterized in that The current operating mode is the carbon capture priority mode; The step of determining a target node among the first to fourth nodes based on the current operating data and the current operating mode includes: If the current time period is a building non-occupied time period and / or a period of low electricity price, the second node is used as the target node.

11. The method according to claim 8, characterized in that The current operating mode is the energy-saving priority mode; The step of determining a target node among the first to fourth nodes based on the current operating data and the current operating mode includes: If the current period is a transitional season in which the indoor and outdoor temperature and humidity deviations are less than a threshold and the cooling and heating loads are small, the third node is used as the target node.

12. The method according to claim 8, characterized in that The current operation mode is the local processing mode; the current operation data is the CO2 concentration data of the indoor space; The step of determining a target node among the first to fourth nodes based on the current operating data and the current operating mode includes: For each area of ​​the indoor space, calculate the absolute value of the difference between the current CO2 concentration of the area and the average CO2 concentration to obtain the CO2 concentration difference corresponding to the area; If the CO2 concentration difference is greater than a preset threshold, the fourth node is used as the target node.

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