Target area temperature control method and device applied to single-pipe heat exchange system

Abstract

The application discloses a target area temperature control method applied to a single-pipe heat exchange system, which is applied to a heat exchange system comprising a carrier fluid direction regulator and a plurality of heat exchange devices, and comprises the following steps: judging whether a condition of changing the carrier fluid flow direction is met or not; and changing the carrier fluid flow direction if the condition is met. The application discloses a target area temperature control method and device applied to a single-pipe heat exchange system, wherein a carrier fluid direction regulator is arranged, the flow direction of the carrier fluid in the pipeline and the heat exchange device of the single-pipe heat exchange system is periodically converted when the condition is met, the actual temperatures of target areas located at different positions are similar, and the disadvantages of the prior art, i.e. the good heat exchange effect of the front end or the first end and the poor heat exchange effect of the rear end or the last end, are overcome. The control method is convenient, the device structure is simple, and the temperature control and regulation effect is good.

Description

Technical Field

[0001] This invention belongs to the field of environmental temperature control technology, and relates to a method and device for controlling the temperature of a target area in a single-pipe heat exchange system. Background Technology

[0002] Existing heat exchange systems for ambient temperature control include heating and cooling systems. For heat exchange systems applied to control the ambient temperature of multiple independent target areas, multiple heat exchange devices (e.g., radiators) are typically installed in multiple target areas to independently regulate the temperature of their respective areas. These multiple heat exchange devices are connected in series via pipes. The energy-carrying fluid in the heat exchange system is typically a high-temperature or low-temperature liquid (e.g., water) or gas (e.g., air), serving as a medium for releasing heat energy for heating or absorbing heat for cooling. The energy-carrying fluid flows sequentially through the multiple series-connected heat exchange devices via pipes.

[0003] Taking a single-pipe heating system as an example, it is a typical heat exchange system as described above. The heating water, as the energy-carrying fluid, passes through the rooms of a user on a certain floor and enters the room of another user in the same location above and below it, and is then transferred to the end. In practice, heating systems commonly have water supply pipes that run from the top floor to the bottom floor of a building. For buildings with many floors, they can also be divided into high zones, low zones, or more zones (such as high zones, middle zones, and low zones) for independent heating, with each zone forming an independent vertically connected single-pipe unidirectional heating system.

[0004] In a single-pipe heating system, hot water cools down as it heats the indoor air through radiators after passing through the initial user's pipes. This temperature drops further as it flows into the next user's pipe. After passing through multiple users, the temperature decreases even further, resulting in lower water and radiator temperatures for downstream or end-user units, making it impossible to guarantee the preset room temperature. Increasing the initial temperature to raise the room temperature for downstream or end-user units would lead to excessively high room temperatures for upstream or end-user units, and also result in significant energy waste for upstream users. In other words, because there is always a temperature difference between the upstream and downstream radiators in this system, the actual room temperature remains inconsistent, preventing all rooms from reaching their optimal temperature simultaneously. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and device for controlling the temperature of a target area that can balance the temperature difference between the front and rear target areas in a single-pipe heat exchange system.

[0006] To achieve the objective of this invention, the following technical solution is adopted:

[0007] A method for controlling the temperature of a target area in a single-pipe heat exchange system is disclosed. The system comprises an energy-carrying fluid direction regulator and multiple heat exchange devices, wherein the multiple heat exchange devices are respectively located in multiple target areas and are used to independently regulate the temperature of their respective target areas. The multiple heat exchange devices are connected in series via pipes, and both ends are connected to the output end of the energy-carrying fluid direction regulator via pipes. The input end of the energy-carrying fluid direction regulator is used to connect to an energy-carrying fluid supplied from outside the heat exchange system. The energy-carrying fluid direction regulator controls the flow direction of the energy-carrying fluid in the pipes and heat exchange devices, and the energy-carrying fluid flows sequentially through the multiple heat exchange devices via pipes. The method includes the following steps:

[0008] Determine whether the current conditions for changing the flow direction of the energy-carrying fluid are met;

[0009] If the conditions are met, change the flow direction of the energy-carrying fluid.

[0010] Furthermore, the condition for changing the flow direction of the energy-carrying fluid is that the duration of the flow direction of the energy-carrying fluid reaches or exceeds the first time threshold T01.

[0011] Furthermore, the first time threshold T01 is greater than the duration of a single cycle T02.

[0012] Furthermore, the method for determining the first time threshold T01 is as follows: obtain the outdoor temperature tw; determine the first time threshold T01 as: T01=T0+A(tw-t1)·T0; where A is a constant, and the value range is 0.02<A<0.2; T0 is the standard time length; t1 is the first reference temperature value.

[0013] Furthermore, the condition for determining whether the flow direction of the energy-carrying fluid is changed is as follows: determine whether the following inequality holds: ts-tm≥t2; where ts and tm are the actual temperature values ​​of the current head and tail target areas, respectively; and t2 is the second temperature reference value.

[0014] Furthermore, the method for obtaining the actual temperature values ​​of the current head and tail target areas is as follows: by using temperature sensors installed in the head and tail target areas, the actual temperature values ​​of the current head and tail target areas are obtained.

[0015] Further, the flow direction of the energy-carrying fluid in the pipeline and heat exchange device is denoted as the first flow direction and the second flow direction. The condition for changing the flow direction of the energy-carrying fluid is: when the current flow direction is the first flow direction, the duration of the energy-carrying fluid flowing in the first flow direction reaches or exceeds a third time threshold T03; or, when the current flow direction is the second flow direction, the duration of the energy-carrying fluid flowing in the second flow direction reaches or exceeds a fourth time threshold T04; wherein the third time threshold T03 is not equal to the fourth time threshold T04.

[0016] Furthermore, the method for changing the flow direction of the energy-carrying fluid is as follows: by using the energy-carrying fluid direction adjuster, the flow direction of the energy-carrying fluid in the pipe and heat exchange device is changed.

[0017] To achieve the objective of this invention, the following technical solution is adopted:

[0018] A target area temperature control device for a single-pipe heat exchange system is disclosed. The system comprises an energy-carrying fluid direction regulator and multiple heat exchange devices, wherein the multiple heat exchange devices are respectively located in multiple target areas for independently regulating the temperature of their respective target areas. The multiple heat exchange devices are connected in series via pipes, with both ends connected to the output end of the energy-carrying fluid direction regulator via pipes. The input end of the energy-carrying fluid direction regulator is used to connect to an energy-carrying fluid supplied from outside the heat exchange system. The energy-carrying fluid direction regulator controls the flow direction of the energy-carrying fluid in the pipes and heat exchange devices, with the energy-carrying fluid flowing sequentially through the multiple heat exchange devices via pipes. The device includes: a judgment module for determining whether the conditions for changing the flow direction of the energy-carrying fluid are met; and an execution module for controlling the energy-carrying fluid direction regulator to change the flow direction of the energy-carrying fluid when the conditions are met.

[0019] Beneficial effects: This invention, by incorporating an energy-carrying fluid direction adjuster, periodically changes the flow direction of the energy-carrying fluid in the pipes and heat exchange devices of the single-pipe heat exchange system under certain conditions. This allows target areas at different locations to achieve similar actual temperatures, overcoming the drawback of traditional single-pipe heat exchange systems that employ unidirectional flow of the energy-carrying fluid, resulting in good heat exchange at the front or initial stage but poor heat exchange at the rear or final stage. The invention also features a convenient control method, a simple device structure, and excellent temperature control. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0021] Figure 2 yes Figure 1A schematic diagram of the overall structure of the medium-energy-carrying fluid direction regulator;

[0022] Figure 3 This is a schematic diagram of the overall process of Example 2;

[0023] Figure 4 This is a schematic diagram of the overall structure of Example 3. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 4 This invention further illustrates specific embodiments of a target area temperature control method and apparatus for a single-pipe heat exchange system. The target area temperature control method and apparatus for a single-pipe heat exchange system are not limited to the descriptions in the following embodiments.

[0025] Example 1:

[0026] This embodiment provides a specific implementation method for a single-pipe heat exchange system.

[0027] The single-pipe heat exchange system includes multiple heat exchange devices respectively installed in different target areas; each heat exchange device is used to independently regulate the temperature of its target area; the multiple heat exchange devices are connected in series via pipes, and the energy-carrying fluid of the heat exchange system flows into the pipe through one port, flows through the multiple heat exchange devices in sequence, and then flows out of the pipe through the other port; the single-pipe heat exchange system also includes an energy-carrying fluid direction regulator for controlling the flow direction of the energy-carrying fluid in the pipes and heat exchange devices.

[0028] Specifically, such as Figure 1 As shown, there are N target areas, denoted as A1-AN. ​​Each target area is equipped with a heat exchange device (multiple devices can also be used, such as multiple radiators in a room, but logically these multiple radiators should be considered as one heat exchange device), denoted as L1-LN. The flow direction of the energy-carrying fluid is: from LN, it flows through each heat exchange device sequentially until it reaches L1 and then flows out. The energy-carrying fluid can be a liquid or gas for heating or cooling (for example, hot water in a radiator heating system or cold air delivered to the room). The multiple heat exchange devices are connected in series through pipes, and their two ends are connected to the output end of the energy-carrying fluid direction regulator. The energy-carrying fluid direction regulator also has an input end for connecting to the externally supplied energy-carrying fluid. Obviously, both the input end and the output end are two interfaces, used for the inflow and outflow of the energy-carrying fluid, respectively. The energy-carrying fluid direction regulator can change the fluid direction at the output end, thereby forming two flow directions, forward and reverse, in the multiple heat exchange devices connected in series.

[0029] In this embodiment, the output of the energy-carrying fluid direction regulator includes a first output state and a second output state; in the two states, the flow direction of the energy-carrying fluid in the pipe and heat exchange device is opposite. Specifically, with Figure 1 Taking the heat exchange system shown as an example, the first output state can be: the energy-carrying fluid first arrives at the heat exchange device LN, and then flows from the heat exchange device LN through other heat exchange devices in sequence until it reaches the heat exchange device L1 and flows out; the second output state can be: the energy-carrying fluid first arrives at the heat exchange device L1, and then flows from the heat exchange device L1 through other heat exchange devices in sequence until it reaches the heat exchange device Ln and flows out.

[0030] In this embodiment, the single-pipe heat exchange system further includes a controller for controlling the output state of the energy-carrying fluid direction regulator. Specifically, the controller can employ a computer architecture, an embedded system architecture, an analog circuit architecture, etc., and is mainly used to determine whether the conditions for changing the flow direction of the energy-carrying fluid are met; if the conditions are met, the flow direction of the energy-carrying fluid is changed. The conditions can be implemented using timing methods, temperature threshold triggering methods, etc., and the specific methods will be described in detail in Embodiment 2.

[0031] In this embodiment, the specific structure of the energy-carrying fluid direction adjuster is as follows: Figure 2 As shown, the system includes multiple on / off devices K1, K2, K3, and K4 connected by interconnecting pipes. When on / off devices K1 and K4 are closed and on / off devices K2 and K3 are open, the output of the energy-carrying fluid direction regulator is in a first output state; otherwise, it is in a second output state. Specifically, on / off devices K1 and K4 are always in phase, and on / off devices K2 and K3 are always in phase, and on / off devices K1 and K4 are always in opposite directions to on / off devices K2 and K3. This ensures that energy-carrying fluid from outside the system is delivered into the heat exchanger of the system in two completely opposite directions. Of course, the structure of the energy-carrying fluid direction regulator is not limited to that described in this embodiment. Any prior art device that can adjust the output of energy-carrying fluid in two opposite directions should be considered as the same as or similar to this embodiment.

[0032] In this embodiment, the on / off devices K1, K2, K3, and K4 are solenoid valve structures. In this embodiment, the controller is used to control the operating states of the on / off devices K1, K2, K3, and K4, thereby controlling the output state of the energy-carrying fluid direction regulator. Specifically, the controller output is an electronic signal or an electronic drive signal, which can directly control the opening or closing of the on / off devices K1, K2, K3, and K4 of the solenoid valve structure, thereby changing the output state of the energy-carrying fluid direction regulator.

[0033] In this embodiment, the single-pipe heat exchange system further includes at least two temperature acquisition devices for collecting the actual temperature signals of the target area and / or the heat exchange devices and sending them to the controller. Specifically, there can be two temperature acquisition devices for collecting the actual temperature signals of the target area and / or the heat exchange devices. Of course, to more accurately collect the ambient temperature, more than two temperature acquisition devices can be set in multiple target areas to reduce measurement errors. After obtaining the actual temperature signal, the controller decides whether to change the direction of the energy-carrying fluid. For example, if a large temperature difference is detected between the first and last chambers or the heat exchange devices, it indicates that there is an imbalance in the current temperature, and the direction of the energy-carrying fluid needs to be reversed. Here, the first chamber refers to the chamber corresponding to the heat exchange device that the energy-carrying fluid first arrives at, and the last chamber refers to the chamber corresponding to the heat exchange device that the energy-carrying fluid last arrives at. The terms "first" and "last" are relative; when the direction of the energy-carrying fluid is reversed, the chambers corresponding to the "first" and "last" will be swapped.

[0034] In this embodiment, the temperature acquisition device is installed on the first and last heat exchangers of the multiple heat exchangers arranged in series, or in the target area where the first and last heat exchangers are located. Specifically, the temperature difference between the first and last ends is often the largest. For example, with... Figure 1 Taking the heating system shown as an example, in the traditional case of supplying water to the first (top) floor first, the temperature on the first floor is often the highest, while the temperature on the bottom floor is the lowest. Therefore, setting temperature acquisition devices on both the first and bottom floors can achieve the best temperature difference acquisition effect. The temperature acquisition device can be set on the heat exchanger or in the target area where the heat exchanger is located, achieving similar technical effects because the temperatures of the two are correlated.

[0035] In this embodiment, the temperature acquisition device is an electronic temperature sensor, which is connected to the controller via a signal transmission cable. Specifically, the energy-carrying fluid direction adjuster is preferably installed at the bottom layer of a series of heat exchange devices (e.g., in a basement). The controller can be located close to the energy-carrying fluid direction adjuster, and the electronic temperature sensor is connected to the controller via a signal transmission cable to transmit temperature signals. The signal transmission cable can be a dedicated cable, such as a network cable or coaxial cable, or it can use a power grid carrier to use the building's power supply lines as the signal transmission channel.

[0036] In this embodiment, the temperature acquisition device is equipped with an electronic temperature sensor. The temperature acquisition device transmits the temperature signal acquired by the electronic temperature sensor to the controller via wireless networking. Specifically, by using wireless networking, the amount of on-site wiring can be reduced, making it particularly suitable for the renovation of existing buildings.

[0037] This embodiment discloses a single-pipe heat exchange system. By setting an energy-carrying fluid direction regulator, the flow direction of the energy-carrying fluid in the pipes and heat exchange devices of the single-pipe heat exchange system can be bidirectionally switched. This enables target areas located at different positions to obtain similar actual temperatures, overcoming the drawback of traditional single-pipe heat exchange systems that use a unidirectional flow method of the energy-carrying fluid, resulting in good heat exchange effect at the front or beginning stage and poor heat exchange effect at the rear or end stage. This embodiment has a simple structure, convenient control process, and good temperature control effect. Compared with existing heat exchange systems, it has advantages such as good temperature uniformity in different target areas, high temperature control accuracy, and energy saving.

[0038] Example 2:

[0039] This embodiment provides a method for controlling the temperature of a target area in a single-pipe heat exchange system, applicable to the single-pipe heat exchange system described in Embodiment 1. Exemplarily, the heat exchange system includes an energy-carrying fluid direction regulator and multiple heat exchange devices. The multiple heat exchange devices are respectively disposed in multiple target areas for independently regulating the temperature of their respective target areas. The multiple heat exchange devices are connected in series via pipes, with both ends connected to the output end of the energy-carrying fluid direction regulator via pipes. The input end of the energy-carrying fluid direction regulator is used to connect to an energy-carrying fluid supplied from outside the heat exchange system. The energy-carrying fluid direction regulator controls the flow direction of the energy-carrying fluid in the pipes and heat exchange devices, and the energy-carrying fluid flows sequentially through the multiple heat exchange devices via the pipes.

[0040] like Figure 3As shown, the target area temperature control method applied to a single-pipe heat exchange system includes the following steps: S1: Determine whether the condition for changing the flow direction of the energy-carrying fluid is met; S2: If the condition is met, change the flow direction of the energy-carrying fluid. For example, step S1 is run in the controller described in Embodiment 1 as a computer program, and can be run in a cyclic manner, for example, performing a condition determination every 1 second. When the determination condition is met, step S2 is executed. The method for executing step S2 can be that the controller sends a command to the energy-carrying fluid direction adjuster, which then changes the flow direction of the energy-carrying fluid in multiple heat exchange devices.

[0041] In this embodiment, the condition for changing the flow direction of the energy-carrying fluid is that the duration of the flow direction of the energy-carrying fluid reaches or exceeds a first time threshold T01. As a convenient and effective method for determining the condition, the first time threshold T01 can be set, for example, 1 hour. When the energy-carrying fluid maintains a flow direction for a duration of 1 hour or more, the flow direction of the energy-carrying fluid in multiple heat exchange devices is changed. This process is repeated to achieve automatic switching of the flow direction of the energy-carrying fluid.

[0042] In this embodiment, the first time threshold T01 is greater than the single cycle duration T02. Specifically, the single cycle duration refers to the time required for the energy-carrying fluid to circulate once in the system. An exemplary calculation method is as follows: the flow rate of the energy-carrying fluid in the system is 40 liters / minute, and the total volume of a group of 6 radiators and pipes in a 6-story building is 200 liters. Then, the single cycle duration T02 is 200 / 40 = 5 minutes, that is, the single cycle duration from the energy-carrying fluid entering the system to its exiting the system is approximately 5 minutes. The value of the first time threshold T01 should be much greater than the single cycle duration T02, for example, 5-10 times greater. The purpose is that if the value of the first time threshold T01 is less than the single cycle duration T02, a portion of the energy-carrying fluid will move back and forth between multiple heat exchange devices, resulting in a reduction in the overall heat exchange capacity of the system.

[0043] In this embodiment, the method for determining the first time threshold T01 is as follows: S1.1: Obtain the outdoor temperature tw; S1.2: Determine the first time threshold T01 as: T01 = T0 + A(tw - t1)·T0; where A is a constant with a value range of 0.02 < A < 0.2; T0 is the standard time length; t1 is the first reference temperature value. For example, the first reference temperature value t1 is set to 0℃, and A is a constant of 0.05; when the outdoor temperature is low, tw = -10℃, T01 = 0.5T0 is calculated; when the outdoor temperature is high, 10℃, T01 = 1.5T0 is calculated. The physical explanation for this calculation method is as follows: When the outdoor temperature is relatively cold, the temperature difference between the first and last rooms of the heat exchange system is large. In this case, it is necessary to shorten the cycle time for changing the flow direction of the energy-carrying fluid, thereby reducing the temperature difference between the first and last target areas of the heat exchange system. When the outdoor temperature is relatively warm, the temperature difference between the first and last target areas of the heat exchange system is small. In this case, it is not necessary to shorten the cycle time for changing the flow direction of the energy-carrying fluid, or it can be increased. The number of times the flow direction of the energy-carrying fluid is changed can be reduced without significantly affecting the temperature difference between the first and last rooms of the heat exchange system.

[0044] In this embodiment, the condition for determining whether the flow direction of the energy-carrying fluid is satisfied is as follows: The following inequality is checked: ts - tm ≥ t2; where ts and tm are the actual temperature values ​​of the current initial and final target regions, respectively; and t2 is the second temperature reference value. This method is used to determine whether the flow direction of the energy-carrying fluid is satisfied. The principle is based on the actual temperature of the target region. When there is a significant difference between the actual temperature values ​​of the initial and final target regions, it indicates that the temperature control results of the heat exchange system are unbalanced and require reversal. For example, the second temperature reference value t2 can be 1-5℃, such as 2℃. It should be noted that if the first time threshold T01 calculated using this method is less than 1-5 times the single cycle duration T02, then the minimum value of the first time threshold T01 should be set to 1-5 times the single cycle duration T02, such as 3 times. Of course, the "ts and tm are the actual temperature values ​​of the current first and last target areas" mentioned in this embodiment are not limited to the actual temperature values ​​of the first and last target areas at the beginning and end. They can also be the actual temperature values ​​of the second and second to last or third target areas at the beginning and end, or even the actual temperature values ​​of the pipes near the beginning and end, or even the actual temperature values ​​of the energy-carrying fluid at the inlet and outlet of the output end of the fluid direction regulator. All of these can be used to indicate the "actual temperature values ​​of the current first and last target areas" and should therefore be included in the scope of this embodiment.

[0045] In this embodiment, the method for obtaining the actual temperature values ​​of the current head and tail target areas is as follows: The actual temperature values ​​of the current head and tail target areas are obtained by using temperature sensors installed in the head and tail target areas. For specific principles and structures, please refer to the relevant content in Embodiment 1.

[0046] In this embodiment, the flow direction of the energy-carrying fluid in the pipe and heat exchange device is denoted as the first flow direction and the second flow direction. The condition for changing the flow direction of the energy-carrying fluid is: when the current flow direction is the first flow direction, the duration of the energy-carrying fluid in the first flow direction reaches or exceeds the third time threshold T03; or, when the current flow direction is the second flow direction, the duration of the energy-carrying fluid in the second flow direction reaches or exceeds the fourth time threshold T04; wherein, the third time threshold T03 is not equal to the fourth time threshold T04.

[0047] Specifically, this embodiment can be considered an optimization scheme that uses a first time threshold T01 as the fixed flow direction switching duration. Due to differences in floor level, room structure, etc., different target areas have different heat dissipation (or heat absorption) rates; for example, the heat dissipation rate of the top floor is usually faster than that of the bottom floor. If a technical solution of switching flow directions using a time threshold T01 is adopted, the result will be that the top floor will have a lower final temperature than the bottom floor. Therefore, this embodiment makes further optimizations by setting different durations for the two flow directions, increasing the compensation for the favorable temperature control direction of the target area with a higher heat dissipation (or heat absorption) rate, i.e., increasing the duration of that direction. For example, the duration of the flow first through the top floor direction (the third time threshold T03) is set to 2 hours, and the duration of the flow first through the bottom floor direction (the fourth time threshold T04) is set to 2.5 hours. This can achieve a better temperature balance effect. The third time threshold T03 and the fourth time threshold T04 can be directly determined based on empirical values, or they can be obtained through repeated adjustments based on actual operating results.

[0048] In this embodiment, the method for changing the flow direction of the energy-carrying fluid is as follows: the flow direction of the energy-carrying fluid in the pipe and heat exchange device is changed by the energy-carrying fluid direction regulator. Specifically, for the principle and process of changing the flow direction of the energy-carrying fluid by controlling the energy-carrying fluid direction regulator with a controller, please refer to the relevant content of Embodiment 1.

[0049] Example 3:

[0050] This embodiment provides a target area temperature control device for a single-pipe heat exchange system.

[0051] The target area temperature control device for a single-pipe heat exchange system is applied to a heat exchange system including an energy-carrying fluid direction regulator and multiple heat exchange devices. The multiple heat exchange devices are respectively located in multiple target areas and are used to independently regulate the temperature of their respective target areas. The multiple heat exchange devices are connected in series via pipes, and both ends are connected to the output end of the energy-carrying fluid direction regulator via pipes. The input end of the energy-carrying fluid direction regulator is used to connect to the energy-carrying fluid supplied from outside the heat exchange system. The energy-carrying fluid direction regulator controls the flow direction of the energy-carrying fluid in the pipes and heat exchange devices, and the energy-carrying fluid flows sequentially through the multiple heat exchange devices via pipes.

[0052] like Figure 4 As shown, the target area temperature control device applied to a single-pipe heat exchange system includes: a judgment module 401, used to judge whether the current condition for changing the flow direction of the energy-carrying fluid is met; and an execution module 402, used to control the energy-carrying fluid direction adjuster to change the flow direction of the energy-carrying fluid when the condition is met.

[0053] Specifically, the physical form of the target area temperature control device applied to the single-pipe heat exchange system can be the controller described in Embodiment 1. When the judgment module 401 and the execution module 402 of the target area temperature control device applied to the single-pipe heat exchange system are running, they execute the method described in Embodiment 2, which will not be repeated in this embodiment.

[0054] The present invention discloses a method and apparatus for controlling the temperature of a target area in a single-pipe heat exchange system. By setting an energy-carrying fluid direction adjuster, the flow direction of the energy-carrying fluid in the pipes and heat exchange devices of the single-pipe heat exchange system is periodically changed when certain conditions are met. This enables target areas located at different positions to obtain similar actual temperatures, overcoming the drawback of traditional single-pipe heat exchange systems that use unidirectional flow of energy-carrying fluid, resulting in good heat exchange effect at the front or initial stage but poor heat exchange effect at the rear or final stage. The control method of the present invention is convenient, and the device structure is simple. Compared with existing temperature control methods, it has advantages such as good temperature uniformity in different target areas, high temperature control accuracy, and energy saving.

[0055] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for controlling the temperature of a target area in a single-pipe heat exchange system, applicable to a heat exchange system including an energy-carrying fluid direction regulator and multiple heat exchange devices, wherein, The plurality of heat exchange devices are respectively arranged in multiple target areas for independently regulating the temperature of their respective target areas; the plurality of heat exchange devices are connected in series via pipes, and both ends are connected to the output end of the energy-carrying fluid direction regulator via pipes; the input end of the energy-carrying fluid direction regulator is used to connect to the energy-carrying fluid supplied from outside the heat exchange system; the energy-carrying fluid direction regulator is used to control the flow direction of the energy-carrying fluid in the pipes and heat exchange devices, and the energy-carrying fluid flows sequentially through the plurality of heat exchange devices via pipes; the method is characterized by comprising the following steps: Determine whether the current condition for changing the flow direction of the energy-carrying fluid is met; the condition for changing the flow direction of the energy-carrying fluid is: the duration of the flow direction of the energy-carrying fluid reaches or exceeds a first time threshold T01; the first time threshold T01 is greater than the duration of a single cycle T02; the method for determining the first time threshold T01 is as follows: T01 = T0 + A(tw-t1)·T0; Where A is a constant with a value range of 0.02 < A < 0.2; T0 is the standard time length; tw is the acquired outdoor temperature; and t1 is the first reference temperature value. If the conditions are met, change the flow direction of the energy-carrying fluid.

2. The method for controlling the temperature of a target area in a single-pipe heat exchange system according to claim 1, characterized in that, The method for changing the flow direction of the energy-carrying fluid is as follows: by using the energy-carrying fluid direction adjuster, the flow direction of the energy-carrying fluid in the pipeline and heat exchange device is changed.

3. A target area temperature control device for a single-pipe heat exchange system, used to execute the target area temperature control method as described in claim 1 or 2, characterized in that, The device includes: The judgment module is used to determine whether the conditions for changing the flow direction of the energy-carrying fluid are met. An execution module is configured to control the energy-carrying fluid direction adjuster to change the flow direction of the energy-carrying fluid when the conditions are met.

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