Warm air heat exchange method based on fresh air system and related device

Abstract

The invention provides a warm air heat exchange method based on a fresh air system and a related device, and relates to the technical field of fresh air systems. The method is applied to the indoor environment where the fresh air system is installed and comprises the steps that a target heat source system is determined based on the outdoor temperature; and based on the target heat source system and the fresh air system, temperature regulation and control are conducted on the indoor environment. The target heat source system is at least one of a steam heat source system and a hot water heat source system. Low-pressure steam of the steam heat source system belongs to a high-grade heat source and has the advantages of rapid temperature rise and high heat exchange efficiency, industrial waste heat hot water of the hot water heat source system is a low-grade heat source, and attributes of the two are complementary. Through intelligent switching or hierarchical combination of the heat source system, regulation and control of the temperature of the indoor environment and maximum reuse of industrial waste heat resources are achieved, the problem of indoor thermal environment imbalance caused by direct entering of low-temperature fresh air in severe cold areas is solved, energy consumption of the whole heat exchange link is reduced, and the energy consumption of the whole heat exchange link is reduced. And adaptability and economical efficiency of the fresh air system under different temperature working conditions are improved.

Description

Technical Field

[0001] This application relates to the field of fresh air system technology, and in particular to a warm air heat exchange method and related apparatus based on a fresh air system. Background Technology

[0002] A fresh air system is a ventilation and air exchange device that uses mechanical power to achieve indoor and outdoor air circulation and exchange. Through organized air supply and exhaust, it forms a stable "fresh air flow field" indoors, enabling the continuous introduction of fresh outdoor air and the directional exhaust of stale indoor air without opening windows, thereby achieving the goal of improving indoor air quality.

[0003] In extremely cold regions where the average winter temperature is as low as -25°C, how to achieve high-efficiency and low-energy-consumption warm air heat exchange based on the existing architecture of fresh air systems has become one of the urgent technical problems to be solved in the field of fresh air system technology. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a heating air heat exchange method based on a fresh air system. This method can achieve high-efficiency and low-energy-consumption heating air heat exchange based on the existing architecture of the fresh air system, significantly improving the adaptability and energy efficiency of the fresh air system in cold regions.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] The first aspect of this application provides a method for warm air heat exchange based on a fresh air system, the method being applied to an indoor environment where a fresh air system is installed; the method includes:

[0007] Based on the outdoor temperature, the target heat source system is determined; the target heat source system is at least one of a steam heat source system and a hot water heat source system.

[0008] The indoor environment temperature is regulated based on the target heat source system and the fresh air system.

[0009] In one alternative implementation, the target heat source system is determined based on outdoor temperature, including:

[0010] If the outdoor temperature is lower than the first temperature threshold, the steam heat source system will be used as the target heat source system.

[0011] If the outdoor temperature is higher than the first temperature threshold and lower than the second temperature threshold, the steam heat source system and the hot water heat source system will be used as the target heat source systems.

[0012] If the outdoor temperature is higher than the second temperature threshold but lower than zero degrees, the hot water heat source system will be used as the target heat source system.

[0013] In one alternative implementation, the target heat source system is a steam heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0014] The fresh air intake side of the fresh air system exchanges heat with the steam in the steam heat source system to obtain the first preheated fresh air.

[0015] The temperature of the indoor environment is regulated by preheating the fresh air.

[0016] In one alternative implementation, the target heat source system is a hot water heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0017] The fresh air intake side of the fresh air system is controlled to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset first target temperature range to obtain the second preheated fresh air.

[0018] The indoor temperature is regulated by using a second preheated fresh air system.

[0019] In one alternative implementation, the target heat source system is a hot water heat source system and a steam heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0020] The fresh air intake side of the fresh air system is controlled to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset second target temperature range to obtain the third preheated fresh air.

[0021] The third preheated fresh air is controlled to exchange heat with the steam in the steam heat source system to obtain the fourth preheated fresh air;

[0022] The indoor temperature is regulated by preheating fresh air.

[0023] In one alternative implementation, the steam in the steam heat source system is low-pressure steam generated by a chemical plant.

[0024] A second aspect of this application provides a warm air heat exchange device based on a fresh air system, the device being applied in an indoor environment where a fresh air system is installed; the device includes:

[0025] The heat source system determination module is used to determine the target heat source system based on the outdoor temperature; the target heat source system is at least one of a steam heat source system and a hot water heat source system.

[0026] The temperature control module is used to regulate the indoor temperature based on the target heat source system and the fresh air system.

[0027] A third aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any implementation of the first aspect.

[0028] A fourth aspect of this application provides an electronic device, comprising:

[0029] A memory on which computer programs are stored;

[0030] A processor for executing a computer program in memory to implement the steps of the method described in any implementation of the first aspect.

[0031] Compared with the prior art, this application has the following advantages:

[0032] This application provides a method for warm air heat exchange based on a fresh air system, applied to indoor environments where a fresh air system is installed. Specifically, it involves: determining a target heat source system based on outdoor temperature; and regulating the indoor environment temperature based on the target heat source system and the fresh air system. The target heat source system is at least one of a steam heat source system and a hot water heat source system. The low-pressure steam output by the steam heat source system is a high-grade heat source, possessing significant advantages such as rapid heating rate and high heat exchange efficiency. The industrial waste hot water used by the hot water heat source system is a low-grade heat source, characterized by abundant waste heat resources and low utilization costs. The two systems complement each other in terms of heat source grade, energy efficiency characteristics, and applicable operating conditions. This application accurately determines the suitable heat source by real-time monitoring of outdoor temperature and relies on the intelligent switching or hierarchical combination strategy of the heat source system to achieve precise regulation of the indoor thermal environment and maximize the reuse of industrial waste heat resources. This effectively solves the problem of indoor thermal environment imbalance caused by the direct introduction of low-temperature fresh air in frigid regions and significantly reduces the energy consumption of the overall heat exchange process, significantly improving the adaptability and operational economy of the fresh air system under different temperature conditions. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of a warm air heat exchange method based on a fresh air system provided in this application embodiment;

[0035] Figure 2 This is a schematic diagram of a fresh air system provided in an embodiment of this application;

[0036] Figure 3This is a schematic diagram of a heating air heat exchange device provided in an embodiment of this application. Detailed Implementation

[0037] A fresh air system is a ventilation and air exchange device that uses mechanical power to achieve indoor and outdoor air circulation and exchange. Through organized air supply and exhaust, it forms a stable "fresh air flow field" indoors, enabling the continuous introduction of fresh outdoor air and the directional exhaust of stale indoor air without opening windows, thereby achieving the goal of improving indoor air quality.

[0038] In extremely cold regions where the average winter temperature is as low as -25°C, how to achieve high-efficiency and low-energy-consumption warm air heat exchange based on the existing architecture of fresh air systems has become one of the urgent technical problems to be solved in the field of fresh air system technology.

[0039] Based on this, this application provides a method for warm air heat exchange based on a fresh air system, applicable to indoor environments where a fresh air system is installed. Specifically, it involves: determining a target heat source system based on the outdoor temperature; and regulating the indoor environment temperature based on the target heat source system and the fresh air system. The target heat source system is at least one of a steam heat source system and a hot water heat source system. The low-pressure steam output by the steam heat source system is a high-grade heat source, possessing significant advantages such as rapid heating rate and high heat exchange efficiency. The industrial waste hot water used in the hot water heat source system is a low-grade heat source, characterized by abundant waste heat resources and low utilization costs. The two systems complement each other in terms of heat source grade, energy efficiency characteristics, and applicable operating conditions. This application accurately determines the suitable heat source by monitoring outdoor temperature in real time, and relies on the intelligent switching or hierarchical combination strategy of the heat source system to achieve precise control of the indoor thermal environment and maximize the reuse of industrial waste heat resources. It not only effectively solves the problem of indoor thermal environment imbalance caused by the direct introduction of low-temperature fresh air in extremely cold regions, but also significantly reduces the energy consumption of the overall heat exchange process, and significantly improves the adaptability and operating economy of the fresh air system under different temperature conditions.

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0041] Figure 1 A flowchart illustrating a warm air heat exchange method based on a fresh air system, provided as an embodiment of this application. (Combined with...) Figure 1 As shown, the heating air heat exchange method disclosed in this application includes:

[0042] S101, based on outdoor temperature, determines the target heat source system.

[0043] The target heat source system is at least one of a steam heat source system and a hot water heat source system.

[0044] The steam used in the steam heat source system of this application is low-pressure steam generated during the chemical plant production process. Low-pressure steam in chemical plants is defined as steam with a gauge pressure ≤ 0.1 MPa (i.e., 1.0 bar, approximately 15 psig), under which its saturation temperature range is 119°C to 120°C. Low-pressure steam possesses the core advantages of high heat exchange capacity and stable heating capability. It not only has outstanding heat carrying capacity per unit volume but also, as a high-grade heat source, can achieve rapid heating while exhibiting high heat exchange efficiency.

[0045] The hot water source system of this application has two types of hot water: one is dedicated heating hot water with a temperature that meets the preset first target temperature range; the other is industrial waste heat hot water with a temperature that meets the preset second target temperature range.

[0046] The first target temperature range is 80°C to 95°C, and the second target temperature range is 40°C to 55°C.

[0047] It is understandable that industrial waste heat hot water is hot water formed by recovering and exchanging waste heat generated in various processes during industrial production. Its energy grade is low, and it is a low-grade heat source.

[0048] In one alternative implementation, determining the target heat source system based on outdoor temperature means based on outdoor temperature, a preset first temperature threshold, and a preset second temperature threshold; wherein the preset first temperature threshold is lower than the preset second temperature threshold.

[0049] For example, the preset first temperature threshold is -10°C; the preset second temperature threshold is -5°C. Those skilled in the art can set the values ​​of the first and second temperature thresholds according to actual needs.

[0050] In one alternative implementation, the target heat source system is determined based on outdoor temperature, including:

[0051] First, determine the relationship between the outdoor temperature and the first and second temperature thresholds;

[0052] Secondly, if the outdoor temperature is below the first temperature threshold, the steam heat source system will be used as the target heat source system; if the outdoor temperature is above the first temperature threshold but below the second temperature threshold, both the steam heat source system and the hot water heat source system will be used as the target heat source system; if the outdoor temperature is above the second temperature threshold but below zero degrees, the hot water heat source system will be used as the target heat source system.

[0053] S102 regulates the temperature of the indoor environment based on the target heat source system and the fresh air system.

[0054] Figure 2 This is a structural schematic diagram of a fresh air system provided in an embodiment of this application. (Combined with...) Figure 2 As shown, the fresh air system consists of the air inlet of the fresh air unit, the target heat source system, the return air duct (exhaust vent), the energy recovery device, the air filtration and conditioning device, the fan, the supply air duct, and the indoor air supply vent.

[0055] The system comprises several components: the fresh air intake of the main unit collects fresh air from the outdoor environment; the target heat source system regulates the temperature of the incoming fresh air; the return air duct (exhaust vent) exhausts stale indoor air to the outside and guides some of the indoor return air to the energy recovery device; the energy recovery device facilitates heat exchange between the outdoor fresh air and the indoor return air, improving the overall system's energy efficiency; the air filtration and regulation device deeply purifies and regulates the humidity of the pre-temperature-controlled fresh air, effectively filtering particulate matter, harmful gases, and other impurities, and adjusting the humidity to a preset comfortable range; the fan provides the power source for airflow throughout the system, adaptively adjusting its operating power and speed based on indoor air quality and air supply needs to ensure stable and uniform air delivery; the air supply duct serves as the delivery path for the treated fresh air, with a layout adapted to the air supply needs of different indoor spaces, enabling precise regional delivery of fresh air; and the indoor air outlets evenly distribute compliant fresh air into various functional areas of the room, completing the replacement and renewal of indoor air.

[0056] During operation, outdoor fresh air is first collected through the air intake of the fresh air unit, while indoor return air is introduced into the energy recovery device through the return air duct. Heat exchange between the fresh air and return air is completed in the energy recovery device. Then, the fresh air enters the air filtration and conditioning device to complete purification and humidity regulation, and then is heated to the preset temperature by the target heat source system. Finally, the fan provides power and delivers the air to each indoor air outlet through the air supply duct to achieve indoor air replacement. The return air that does not participate in heat recovery is discharged outdoors through the exhaust vent.

[0057] In one alternative implementation, the target heat source system is a steam heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0058] The fresh air intake side of the fresh air system exchanges heat with the steam in the steam heat source system to obtain the first preheated fresh air; the temperature of the indoor environment is regulated by the first preheated fresh air.

[0059] Specifically, the steam heat source system is activated, allowing low-pressure steam with a gauge pressure ≤0.1MPa produced by the chemical plant to enter the target heat exchange system of the fresh air system. Simultaneously, outdoor fresh air collected by the air inlet of the fresh air unit is introduced into the target heat exchange system and exchanges heat with the low-pressure steam. Since the low-pressure steam is a high-grade heat source with high heat exchange efficiency, it can quickly raise the temperature of the outdoor fresh air to the preset indoor suitable temperature, forming the first preheated fresh air. Subsequently, the first preheated fresh air is purified and its humidity is calibrated by the air filtration and regulation device, and then driven by the fan to be transported to each indoor air outlet through the air supply duct, continuously supplying constant-temperature clean fresh air into the room, replacing the original cold air in the room, thereby achieving precise temperature control of the indoor environment and ensuring that the indoor temperature is maintained within a comfortable range.

[0060] Since the steam heat source system is low-pressure steam generated by the chemical plant, which has the characteristics of stable source, industrial by-product energy and low acquisition cost, it can be used as a heat source for fresh air preheating to realize the cascade utilization of industrial waste heat. This not only reduces the energy waste of waste heat emissions from the chemical plant, but also significantly reduces the heating cost of the fresh air system and improves the overall economic applicability of the system.

[0061] In one alternative implementation, the target heat source system is a hot water heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0062] The fresh air intake side of the fresh air system exchanges heat with the hot water in the hot water exchanger, whose temperature meets the preset first target temperature range, to obtain the second preheated fresh air; the indoor environment temperature is regulated by the second preheated fresh air.

[0063] Specifically, the hot water source system is activated, delivering heated water at a stable temperature of 80℃-95℃ (the first target temperature range) to the target heat source system of the fresh air system. Simultaneously, the fresh air unit continuously collects outdoor fresh air from its intake and guides it into the fresh air duct of the target heat source system. After heat exchange with the high-temperature hot water in the pipes, the outdoor fresh air is heated to a preset indoor temperature, forming a second preheated fresh air. This second preheated fresh air then enters the air filtration and regulation device, where particulate matter, harmful gases, and other impurities are filtered and purified, and humidity is precisely calibrated to meet indoor air comfort standards. Driven by a fan, the air is then distributed to various indoor air outlets through the air supply ducts, continuously delivering constant-temperature, clean second preheated fresh air into the room, gradually replacing the original low-temperature indoor air. This achieves stable temperature control of the indoor environment, ensuring the indoor temperature remains within the user's desired comfort range. Throughout the process, the hot water flow rate of the hot water exchanger can be fine-tuned based on real-time indoor temperature feedback, ensuring precise temperature control.

[0064] At this time, the hot water in the hot water source system is specially heated hot water whose temperature meets the preset first target temperature range. It is regulated by a professional temperature control device and can maintain a stable temperature range of 80℃-95℃ for a long time with minimal fluctuations in heating parameters. Therefore, it can provide a continuous and uniform preheating effect for fresh air, avoid insufficient or excessive preheating of fresh air due to fluctuations in hot water temperature, and ensure the stability and accuracy of indoor temperature control.

[0065] In one alternative implementation, the target heat source system is a hot water heat source system and a steam heat source system. Based on the target heat source system and the fresh air system, the indoor environment temperature is regulated, including:

[0066] The fresh air intake of the fresh air system is controlled to exchange heat with the hot water in the hot water exchanger at a temperature that meets the preset second target temperature range to obtain the third preheated fresh air; the third preheated fresh air is controlled to exchange heat with the steam in the steam heat source system to obtain the fourth preheated fresh air; the temperature of the indoor environment is regulated by the fourth preheated fresh air.

[0067] Specifically, the hot water source system is activated to obtain industrial waste heat hot water at a temperature of 40℃-55℃ (the second target temperature range). Simultaneously, the heat exchange module of the hot water source system collects outdoor fresh air from the air inlet of the fresh air unit, and completes the first heat exchange with the industrial waste heat hot water to obtain the third preheated fresh air, realizing the recovery and utilization of low-grade industrial waste heat and reducing the heating load of the subsequent steam heat source. Subsequently, the third preheated fresh air enters the corresponding heat exchange module of the steam heat source system and undergoes a second heat exchange with the low-pressure steam provided by the chemical plant. Since the low-pressure steam is a high-grade heat source, it can quickly raise the temperature of the third preheated fresh air to the preset indoor suitable temperature, forming the fourth preheated fresh air. The fourth preheated fresh air then enters the air filtration and conditioning device to complete the filtration of impurities such as particulate matter and harmful gases and to accurately calibrate the humidity. Then, driven by the fan, it is distributed to each indoor air outlet through the air supply duct, continuously delivering constant-temperature clean fresh air into the room, gradually replacing the low-temperature indoor air, and realizing precise temperature control of the indoor environment.

[0068] By combining a heat exchange strategy of "low-grade waste heat recovery and high-grade heat source heating" with subsequent filtration and humidity calibration processes, the system achieves precise and stable control of indoor ambient temperature. This maximizes the utilization of industrial waste heat and reduces indirect consumption of fossil energy, while also taking into account indoor environmental comfort, system operation economy, and green environmental benefits.

[0069] Based on the same inventive concept, this application provides a warm air heat exchange device for a fresh air system. Figure 3 This is a schematic diagram of a warm air heat exchange device provided in an embodiment of this application. (Combined with...) Figure 3 As shown, the heating air heat exchange device 300 provided in this application includes:

[0070] The heat source system determination module 301 is used to determine the target heat source system based on the outdoor temperature; the target heat source system is at least one of a steam heat source system and a hot water heat source system.

[0071] Temperature control module 302 is used to control the temperature of the indoor environment based on the target heat source system and the fresh air system.

[0072] In one alternative implementation, the heat source system determination module 301 includes:

[0073] The first target heat source system determination unit is used to determine the steam heat source system as the target heat source system if the outdoor temperature is lower than the first temperature threshold.

[0074] The second target heat source system determination unit is used to determine the steam heat source system and the hot water heat source system as target heat source systems if the outdoor temperature is higher than the first temperature threshold and lower than the second temperature threshold.

[0075] The third target heat source system determination unit is used to determine the hot water heat source system as the target heat source system if the outdoor temperature is higher than the second temperature threshold and lower than zero degrees.

[0076] In one alternative implementation, the temperature control module 302 includes:

[0077] The first preheated fresh air determination unit is used to control the heat exchange between the fresh air intake side of the fresh air system and the steam in the steam heat source system to obtain the first preheated fresh air.

[0078] The first temperature control unit is used to control the temperature of the indoor environment through the first preheated fresh air.

[0079] In one alternative implementation, the temperature control module 302 includes:

[0080] The second preheated fresh air determination unit is used to control the fresh air intake side of the fresh air system to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset first target temperature range, so as to obtain the second preheated fresh air.

[0081] The second temperature control unit is used to regulate the indoor temperature by using the second preheated fresh air.

[0082] In one alternative implementation, the temperature control module 302 includes:

[0083] The third preheated fresh air determination unit is used to control the fresh air on the intake side of the fresh air system to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset second target temperature range, so as to obtain the third preheated fresh air.

[0084] The fourth preheated fresh air determination unit is used to control the heat exchange between the third preheated fresh air and the steam in the steam heat source system to obtain the fourth preheated fresh air.

[0085] The third temperature control unit is used to regulate the indoor temperature by using the fourth preheated fresh air.

[0086] Based on the fresh air system heating and heat exchange method and apparatus provided in the foregoing embodiments, this application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements some or all of the steps in the aforementioned fresh air system heating and heat exchange method.

[0087] Based on the fresh air system heating heat exchange method and apparatus provided in the foregoing embodiments, this application also provides an electronic device, including:

[0088] A memory on which computer programs are stored;

[0089] A processor is used to execute a computer program in memory to implement some or all of the steps in the warm air heat exchange method of the fresh air system provided in the foregoing embodiments.

[0090] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0091] The above is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for warm air heat exchange based on a fresh air system, characterized in that, The method is applied to indoor environments where fresh air systems are installed; the method includes: Based on the outdoor temperature, a target heat source system is determined; the target heat source system is at least one of a steam heat source system and a hot water heat source system. The indoor environment temperature is regulated based on the target heat source system and the fresh air system.

2. The method according to claim 1, characterized in that, The system for determining the target heat source based on outdoor temperature includes: If the outdoor temperature is lower than the first temperature threshold, the steam heat source system will be used as the target heat source system. If the outdoor temperature is higher than the first temperature threshold and lower than the second temperature threshold, the steam heat source system and the hot water heat source system are used as the target heat source system. If the outdoor temperature is higher than the second temperature threshold but lower than zero degrees, the hot water heat source system will be used as the target heat source system.

3. The method according to claim 2, characterized in that, The target heat source system is the steam heat source system. The temperature control of the indoor environment based on the target heat source system and the fresh air system includes: The fresh air intake side of the fresh air system is controlled to exchange heat with the steam in the steam heat source system to obtain the first preheated fresh air; The temperature of the indoor environment is regulated by the first preheated fresh air.

4. The method according to claim 2, characterized in that, The target heat source system is the hot water heat source system. The temperature control of the indoor environment based on the target heat source system and the fresh air system includes: The fresh air intake side of the fresh air system is controlled to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset first target temperature range to obtain the second preheated fresh air. The indoor environment temperature is regulated by the second preheated fresh air.

5. The method according to claim 2, characterized in that, The target heat source system comprises the hot water heat source system and the steam heat source system. The temperature control of the indoor environment based on the target heat source system and the fresh air system includes: The fresh air intake side of the fresh air system is controlled to exchange heat with the hot water in the hot water exchanger whose temperature meets the preset second target temperature range to obtain the third preheated fresh air. The third preheated fresh air is controlled to exchange heat with the steam in the steam heat source system to obtain the fourth preheated fresh air; The temperature of the indoor environment is regulated by the fourth preheated fresh air.

6. The method according to any one of claims 1-5, characterized in that, The steam in the steam heat source system is low-pressure steam generated by the chemical plant.

7. A warm air heat exchange device based on a fresh air system, characterized in that, The device is used in indoor environments where a fresh air system is installed; the device includes: A heat source system determination module is used to determine the target heat source system based on outdoor temperature; the target heat source system is at least one of a steam heat source system and a hot water heat source system. The temperature control module is used to control the temperature of the indoor environment based on the target heat source system and the fresh air system.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-6.

9. An electronic device, characterized in that, include: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-6.

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