Air conditioning system and air conditioning system temperature control method

Abstract

The invention discloses a temperature control method for an air conditioning system. A host and a communication line are included. The control method comprises the steps that the host operates a refrigeration mode or a heating mode according to the indoor environment temperature; the average indoor environment temperature is obtained through the communication line; and the indoor environment average temperature is compared with a preset temperature range, if the indoor environment average temperature meets the preset temperature requirement, the requirement for keeping the temperature of a heat exchange medium unchanged is sent to a host, and if the indoor environment average temperature does not meet the preset temperature requirement, the requirement for changing the temperature of the heat exchange medium is sent to the host. The host adjusts the appropriate heat exchange medium output temperature according to different requirements, and when the load is low, the temperature of the refrigeration heat exchange medium is increased, the temperature of the heating heat exchange medium is reduced, so that the operation energy efficiency of the system is improved, and the power consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning equipment, and in particular to a temperature control method for an air conditioning system. In addition, the present invention also relates to an air conditioning system using the above control method. Background Art

[0002] In the air conditioning system, the fan coil unit is used as a terminal device connected to the host to achieve temperature control in each room. Among them, the fan coil unit is a terminal device composed of a fan and a heat exchange coil. It exchanges heat between a cold or hot heat exchange medium and air to achieve a cooling or heating effect. The medium inside the heat exchange coil can be a cold or hot heat exchange medium. When a cold heat exchange medium is passed in, it cools, and when a hot heat exchange medium is passed in, it heats.

[0003] Furthermore, in cooling mode, the higher the temperature of the heat exchange medium outputted by the host, the more energy-saving the system is. In heating mode, the lower the temperature of the heat exchange medium outputted, the more energy-saving the system is. Conversely, the more power is consumed. At the same time, the fan coil controls the room temperature by opening and closing the control valve. When the control valve is opened, cooling and heating are performed, and when the control valve is closed, cooling and heating are stopped.

[0004] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems: the temperature of the cold and hot heat exchange medium provided by the host is usually set manually, and the temperature will not be automatically adjusted according to actual needs. Low cooling temperature or high heating temperature will cause the cold and heat source equipment of the host to operate with low energy efficiency. At the same time, inappropriate heat exchange medium temperature will also cause the room temperature to fail to meet the requirements, or cause the control valve of the fan coil to start and stop frequently, affecting the user's comfort and wasting electricity.

[0005] Therefore, providing a control method that can automatically adjust the output temperature of the heat exchange medium to reduce the energy consumption of the host operation is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a temperature control method for an air conditioning system, so as to solve the problem that the temperature of a heat exchange medium is artificially adjusted, resulting in a low or high operating temperature of a host, and thus causing low operating energy efficiency of the host.

[0007] In order to solve the above technical problems, the present invention provides a temperature control method for an air conditioning system, comprising a host and a communication line;

[0008] The control method steps include:

[0009] The host is in cooling mode or heating mode according to the indoor ambient temperature;

[0010] Obtaining the average temperature of the indoor environment through the communication line;

[0011] The average temperature of the indoor environment is compared with the preset temperature range. If the average temperature of the indoor environment meets the preset temperature requirement, a request to keep the temperature of the heat exchange medium unchanged is sent to the host. If the average temperature of the indoor environment does not meet the preset temperature requirement, a request to change the temperature of the heat exchange medium is sent to the host.

[0012] Preferably, the comparing the indoor environment average temperature with a preset temperature range comprises the steps of:

[0013] In cooling mode, the average temperature of the indoor environment is compared with the preset cooling temperature range. If the average temperature of the indoor environment is greater than the preset cooling temperature range, a request to reduce the temperature of the heat exchange medium is sent to the host. If the average temperature of the indoor environment is less than the preset cooling temperature range, a request to keep the temperature of the heat exchange medium unchanged is sent to the host.

[0014] In heating mode, the average temperature of the indoor environment is compared with the preset heating temperature range. If the average temperature of the indoor environment is lower than the preset heating temperature range, a request to increase the temperature of the heat exchange medium is sent to the host. If the average temperature of the indoor environment is higher than the preset heating temperature range, a request to keep the temperature of the heat exchange medium unchanged is sent to the host.

[0015] Preferably, a fan coil unit and a control valve are also included, and the control method includes:

[0016] Obtaining an actual opening ratio of a control valve, wherein the control valve is used to control the opening or closing of a pipeline for conveying heat exchange medium to a fan coil unit;

[0017] In cooling mode, if the average temperature of the indoor environment is within the preset cooling temperature range, the actual opening ratio is compared with the preset opening ratio. If the actual opening ratio is greater than or equal to the preset opening ratio, a request to keep the temperature of the heat exchange medium unchanged is sent to the host. If the actual opening ratio is less than the preset opening ratio, a request to increase the temperature of the heat exchange medium is sent to the host.

[0018] In heating mode, if the average temperature of the indoor environment is within the preset heating temperature range, the actual opening ratio is compared with the preset opening ratio. If the actual opening ratio is greater than or equal to the preset opening ratio, a request to keep the temperature of the heat exchange medium unchanged is sent to the host. If the actual opening ratio is less than the preset opening ratio, a request to lower the temperature of the heat exchange medium is sent to the host.

[0019] Preferably, the host operates in cooling mode or heating mode including the steps of:

[0020] The initial temperature of the heat exchange medium is set, and the host continuously delivers the heat exchange medium to the fan coil at the initial temperature for a first preset time.

[0021] Preferably, the step of obtaining the average temperature of the indoor environment comprises the following steps:

[0022] At every second preset time interval, the average temperature of the indoor environment is counted once, and is repeatedly compared with the cooling preset temperature range or the heating preset temperature range.

[0023] Preferably, obtaining the actual opening ratio of the control valve comprises the steps of:

[0024] At every third preset time interval, the actual activation ratio is counted once, and is repeatedly compared with the preset activation ratio.

[0025] Preferably, the plurality of fan coil units in different rooms send their respective heat exchange medium temperature requirements to the host. In cooling mode, the host adjusts the output temperature according to the minimum temperature requirement. In heating mode, the host adjusts the output temperature according to the maximum temperature requirement.

[0026] Preferably, the step of sending a request to the host to increase the temperature of the heat exchange medium comprises:

[0027] The target temperature of the heat exchange medium is calculated by the formula, and the host outputs the heat exchange medium according to the target temperature. The formula is:

[0028] T 目标 =D 1 *[k*(A 1 *T 2 +B 1 *T +C 1 )] 2 +E 1 *k*(A 1 *T 2 +B 1 *T +C 1 )+F 1

[0029] Among them, T 目标 is the target temperature of the heat exchange medium output by the host, T is the real-time temperature of the heat exchange medium output by the host, k is the actual opening ratio of the control valve, A 1 , B 1 , C 1 , D 1 、E 1 、F 1 is the refrigeration temperature correction parameter;

[0030] The step of sending a request to lower the temperature of the heat exchange medium to the host comprises:

[0031] The target temperature of the heat exchange medium is calculated by the formula, and the host outputs the heat exchange medium according to the target temperature. The formula is:

[0032] T 目标 =D 2 *[k*(A 2 *T 2 +B 2 *T +C 2 )] 2 +E 2 *k*(A 2 *T 2 +B 2 *T +C 2 )+F 2

[0033] Among them, T 目标 is the target temperature of the heat exchange medium output by the host, T is the real-time temperature of the heat exchange medium output by the host, k is the actual opening ratio of the control valve, A 2 , B 2 , C 2 , D 2 、E 2 、F 2 It is the heating temperature correction parameter.

[0034] Preferably, the step of sending a request to the host to increase the temperature of the heat exchange medium comprises:

[0035] The temperature of the heat exchange medium output by the host increases by a fixed step parameter;

[0036] The step of sending a request to lower the temperature of the heat exchange medium to the host comprises:

[0037] The temperature of the heat exchange medium output by the host is reduced by a fixed step parameter.

[0038] The present invention provides an air-conditioning system, comprising a main unit and a plurality of fan coil units distributed in a plurality of rooms, wherein the main unit transports a heat exchange medium to each of the fan coil units through a pipeline, and the pipelines connecting each of the fan coil units are respectively provided with a control valve, and the temperature of the heat exchange medium in each of the fan coil units is controlled according to a control method as described in any one of the above items.

[0039] The present invention provides a temperature control method for an air-conditioning system, comprising a host and a communication line; the control method comprises the following steps: the host operates a cooling mode or a heating mode according to an indoor environment temperature; the average temperature of the indoor environment is obtained through the communication line; the average temperature of the indoor environment is compared with a preset temperature range, and if the average temperature of the indoor environment meets the preset temperature requirement, a requirement for keeping the temperature of a heat exchange medium unchanged is sent to the host, and if the average temperature of the indoor environment does not meet the preset temperature requirement, a requirement for changing the temperature of the heat exchange medium is sent to the host.

[0040] The average indoor environment temperature is obtained and compared with the preset temperature range. Based on the comparison result, the demand for temperature change of the heat exchange medium is sent to the host to realize the linkage between the host and the fan coil. The fan coil outputs the temperature demand of the heat exchange medium according to its own operating parameters. The host collects and summarizes the temperature requirements of different rooms. The host adjusts the appropriate output temperature of the heat exchange medium according to different requirements. When the load is low, the temperature of the cooling heat exchange medium is increased, and the temperature of the heating heat exchange medium is reduced, so as to improve the operating energy efficiency of the system and reduce power consumption, avoid frequent start and stop of the control valve, avoid indoor temperature fluctuations due to high or low temperature of the heat exchange medium, reduce fluctuations, and improve comfort.

[0041] The present invention also provides an air-conditioning system using the temperature control method of the air-conditioning system. Since the temperature control method of the air-conditioning system has the above-mentioned technical effects, the air-conditioning system should also have the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a flow chart of a specific implementation of the temperature control method for an air conditioning system provided by the present invention;

[0043] FIG2 is a schematic structural diagram of a specific embodiment of the air conditioning system provided by the present invention;

[0044] FIG3 is a flow chart of a cooling mode of a specific implementation of the temperature control method of an air-conditioning system provided by the present invention;

[0045] FIG. 4 is a flow chart of a heating mode of a specific implementation of the temperature control method of the air-conditioning system provided by the present invention.

[0046] Among them, host 1, fan coil 2, control valve 3, communication line 4. DETAILED DESCRIPTION

[0047] The core of the present invention is to provide an air conditioning system temperature control method, which is used to solve the problem that artificially adjusting the temperature of the heat exchange medium causes the main unit operating temperature to be too low or too high, thereby causing the main unit's operating energy efficiency to be low.

[0048] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Please refer to Figures 1 to 4, Figure 1 is a flow chart of a specific implementation of the air-conditioning system temperature control method provided by the present invention; Figure 2 is a structural schematic diagram of a specific implementation of the air-conditioning system provided by the present invention; Figure 3 is a cooling mode flow chart of a specific implementation of the air-conditioning system temperature control method provided by the present invention; Figure 4 is a heating mode flow chart of a specific implementation of the air-conditioning system temperature control method provided by the present invention.

[0050] In the air conditioning system, a host and multiple fan coil units 2 distributed in multiple indoor environments are included. The multiple fan coil units 2 are connected in parallel. The host 1 is connected to each fan coil unit 2 through a pipeline to transport heat exchange medium to each fan coil unit 2. At the same time, the pipelines connecting each fan coil unit 2 are respectively equipped with a control valve 3, and each room is provided with a temperature sensor, and each control valve 3 is equipped with a working status detector. The host 1 is connected to each fan coil unit 2 through a communication line 4. The host 1 obtains the temperature requirements of each room through the communication line 4, and judges and adjusts the target temperature output by the host.

[0051] The specific embodiment of the present invention provides a temperature control method for an air conditioning system, including a host 1 and a communication line 4, and the control method includes the steps of:

[0052] The control host 1 runs the cooling mode or heating mode according to the indoor ambient temperature. The host starts, and according to the rotating cooling mode or heating mode, the host outputs low-temperature heat exchange medium or high-temperature heat exchange medium to the fan coil 2 in each room. The fan of the fan coil 2 starts to realize the heat exchange between the heat exchange medium and the air, and blows cold air or hot air into the room to complete the cooling or heating work. Among them, each fan coil 2 is equipped with a separate control valve 3, and detects the temperature in the room to determine whether it meets the requirements, and then controls the valve 3 to open or close, and controls whether the heat exchange medium can reach the fan coil 2. When the indoor temperature meets the requirements, the control valve 3 is closed, and when the indoor temperature does not meet the requirements, the control valve 3 is opened again. In the above manner, the indoor temperature is kept within a relatively stable range.

[0053] After a period of stable operation, the average temperature of the indoor environment is obtained. At the same time, each room is set with a preset temperature range for cooling and heating. During the setting process, you can directly set the range value or set a set temperature T 设定 and a differential temperature a, that is, the corresponding preset temperature range is T 设定 -a to T 设定 +a, the two methods have the same results, but the second method is more convenient for inputting settings.

[0054] The average temperature of the indoor environment is compared with the preset temperature range. If the average temperature of the indoor environment meets the temperature requirement, a request to keep the temperature of the heat exchange medium unchanged is sent to the host. If the average temperature of the indoor environment does not meet the temperature requirement, a request to change the temperature of the heat exchange medium is sent to the host.

[0055] Specifically, in cooling mode, the average temperature of the indoor environment is compared with the preset cooling temperature range. If the average temperature of the indoor environment is greater than the preset cooling temperature range, that is, T 平均 >T 设定 +a, it means that the cooling effect is not enough, so the corresponding fan coil 2 sends a request to lower the temperature of the heat exchange medium to the host 1. After receiving this request, the host 1 outputs the heat exchange medium with a lower temperature to the corresponding fan coil 2. If the average indoor environment temperature is less than the preset cooling temperature range, that is, T 平均 <T 设定 -a, it is usually the user who suddenly adjusts the set temperature. As long as a period of time is waited, the temperature will return to the preset range. Therefore, the corresponding fan coil 2 sends a request to the host 1 to keep the temperature of the heat exchange medium unchanged. After receiving this request, the host 1 maintains the original temperature and continues to output the heat exchange medium.

[0056] In heating mode, compare the average indoor temperature with the preset heating temperature range. If the average indoor temperature is lower than the preset heating temperature range, T 平均 <T 设定 -a, it means that the heating effect is not enough, so the corresponding fan coil 2 sends a request to the host 1 to increase the temperature of the heat exchange medium. After receiving this request, the host 1 outputs the heat exchange medium with the increased temperature to the corresponding fan coil 2. If the average indoor environment temperature is greater than the preset heating temperature range, that is, T 平均 >T 设定 +a, it is usually the user who suddenly adjusts the set temperature. As long as a period of time is waited, the temperature will return to the preset range. Therefore, the corresponding fan coil 2 sends a request to the host 1 to keep the temperature of the heat exchange medium unchanged. After receiving this request, the host 1 maintains the original temperature and continues to output the heat exchange medium.

[0057] The average indoor environment temperature is obtained and compared with the preset temperature range. Based on the comparison result, the demand for temperature change of the heat exchange medium is sent to the host to realize the linkage between the host and the fan coil. The fan coil outputs the temperature demand of the heat exchange medium according to its own operating parameters. The host collects and summarizes the temperature requirements of different rooms. The host adjusts the appropriate output temperature of the heat exchange medium according to different requirements. When the load is low, the temperature of the cooling heat exchange medium is increased, and the temperature of the heating heat exchange medium is reduced, so as to improve the operating energy efficiency of the system and reduce power consumption, avoid frequent start and stop of the control valve, avoid indoor temperature fluctuations due to high or low temperature of the heat exchange medium, reduce fluctuations, and improve comfort.

[0058] To further achieve energy saving, the following steps are included:

[0059] The actual opening ratio of the control valve 3 is obtained, wherein the control valve 3 is used to control the opening or closing of the pipeline for transporting the heat exchange medium to the fan coil unit 2. Therefore, in the actual operation of the system, the control valve 3 is not continuously opened, and the control valve 3 will be closed according to the actual temperature.

[0060] In cooling mode, if the average indoor temperature is within the cooling preset temperature range, T 设定 -a≤T 平均 ≤T 设定 +a, then compare the actual opening ratio k and the preset opening ratio c. If the actual opening ratio is greater than or equal to the preset opening ratio, that is, k≥c, the optimal opening ratio is 1, which means continuous opening, k≥c, indicating that the temperature of the heat exchange medium is close to the ideal value. Therefore, a request to keep the temperature of the heat exchange medium unchanged is sent to the host 1. After receiving this request, the host 1 continues to output the heat exchange medium at the original temperature. If the actual opening ratio is less than the preset opening ratio, that is, k<c, it means that the temperature of the heat exchange medium is low and is not the most economical temperature. Therefore, a request to increase the temperature of the heat exchange medium is sent to the host 1. After receiving this request, the host 1 outputs the heat exchange medium with the increased temperature to the corresponding fan coil 2. In the above manner, the temperature of the heat exchange medium is prevented from being too low during the refrigeration process, thereby avoiding energy waste.

[0061] In heating mode, if the average indoor temperature is within the preset heating temperature range, T 设定 -a≤T 平均 ≤T 设定 +a, then compare the actual opening ratio k and the preset opening ratio c. If the actual opening ratio is greater than or equal to the preset opening ratio, that is, k≥c, the optimal opening ratio is 1, which means continuous opening, k≥c, indicating that the temperature of the heat exchange medium is close to the ideal value. Therefore, a request to keep the temperature of the heat exchange medium unchanged is sent to the host 1. After receiving this request, the host 1 continues to output the heat exchange medium at the original temperature. If the actual opening ratio is less than the preset opening ratio, that is, k<c, the temperature of the heat exchange medium is too high and is not the most economical temperature. Therefore, a request to reduce the temperature of the heat exchange medium is sent to the host 1. After receiving this request, the host 1 outputs the heat exchange medium with a reduced temperature to the corresponding fan coil 2. In the above manner, the temperature of the heat exchange medium is prevented from being too high during the heating process, thereby avoiding energy waste.

[0062] Furthermore, when the average temperature of the indoor environment is within the preset temperature range, the opening time of the control valve 3 is still determined in the above manner.

[0063] By the above method, the number of times the control valve 3 is started can be reduced, the service life can be extended, and the noise generated by the start and stop of the control valve 3 can be reduced, thereby improving the comfort of use. Furthermore, the output temperature of the host 1 and the start and stop time of the control valve 3 are controlled in a linked manner to achieve the most reasonable temperature control.

[0064] In the temperature control method of the air conditioning system provided in the specific embodiment of the present invention, the host 1 operates in cooling mode or heating mode, including the following steps:

[0065] The initial temperature of the heat exchange medium is set, and the host 1 continuously delivers the heat exchange medium to the fan coil 2 at the initial temperature for a first preset time.

[0066] After stable operation, the average indoor environment temperature is counted once every second preset time, and repeatedly compared with the cooling preset temperature range or the heating preset temperature range.

[0067] Every third preset time interval, the actual opening ratio is counted once and compared with the preset opening ratio repeatedly.

[0068] In a specific implementation, the specific steps of the cooling mode are:

[0069] The initial temperature of the heat exchange medium is set, and the host 1 continuously delivers the heat exchange medium to the fan coil 2 at the initial temperature for a first preset time.

[0070] After stable operation, the average indoor environment temperature is counted once at every second preset time interval and compared with the preset temperature range for cooling or heating. The actual opening ratio is counted once at every third preset time interval and compared with the preset opening ratio.

[0071] Fan coil unit 2 judgment T 平均 >T 设定 + a is true, if true, then send a request to host 1 to lower the temperature of the heat exchange medium, if not true, then judge T 平均 <T 设定 -a is true, if so, a request to keep the temperature of the heat exchange medium unchanged is sent to host 1, if not, continue to judge whether k≥c is true, if so, a request to keep the temperature of the heat exchange medium unchanged is sent to host 1, if not, a request to increase the temperature of the heat exchange medium is sent to host 1.

[0072] The specific steps of heating mode are:

[0073] The initial temperature of the heat exchange medium is set, and the host 1 continuously delivers the heat exchange medium to the fan coil 2 at the initial temperature for a first preset time.

[0074] After stable operation, the average indoor environment temperature is counted once at every second preset time interval and compared with the preset temperature range for cooling or heating. The actual opening ratio is counted once at every third preset time interval and compared with the preset opening ratio.

[0075] Fan coil unit 2 judgment T 平均 <T 设定 -a is true, if true, then send a request to host 1 to increase the temperature of the heat exchange medium, if not true, then judge T 平均 >T 设定 +a is true, if so, a request to keep the temperature of the heat exchange medium unchanged is sent to host 1; if not, a request to keep the temperature of the heat exchange medium unchanged is sent to host 1; if not, a request to reduce the temperature of the heat exchange medium is sent to host 1.

[0076] Based on the control methods provided in the above-mentioned specific implementation methods, multiple fan coil units 2 in different rooms send their respective heat exchange medium temperature requirements to the host 1. In cooling mode, the host 1 adjusts the output temperature according to the minimum temperature requirement. In heating mode, the host 1 adjusts the output temperature according to the maximum temperature requirement.

[0077] In the first embodiment, after sending a request to increase the temperature of the heat exchange medium to the host 1, the steps include:

[0078] The target temperature of the heat exchange medium is calculated by the formula, and the host 1 outputs the heat exchange medium according to the target temperature. The formula is:

[0079] T 目标 =D 1 *[k*(A 1 *T 2 +B 1 *T +C 1 )] 2 +E 1 *k*(A 1 *T 2 +B 1 *T +C 1 )+F 1

[0080] Among them, T 目标 is the target temperature of the heat exchange medium output by host 1, T is the real-time temperature of the heat exchange medium output by host 1, k is the actual opening ratio of control valve 3, A 1 , B 1 , C 1 , D 1 、E 1 、F 1 is the refrigeration temperature correction parameter;

[0081] After sending a request to lower the temperature of the heat exchange medium to the host 1, the steps include:

[0082] The target temperature of the heat exchange medium is calculated by the formula, and the host 1 outputs the heat exchange medium according to the target temperature. The formula is:

[0083] T 目标 =D 2 *[k*(A 2 *T 2 +B 2 *T +C 2 )] 2 +E 2 *k*(A 2 *T 2 +B 2 *T +C 2 )+F 2

[0084] Among them, T 目标 is the target temperature of the heat exchange medium output by host 1, T is the real-time temperature of the heat exchange medium output by host 1, k is the actual opening ratio of control valve 3, A 2 , B 2 , C 2 , D 2 、E 2 、F 2 It is the heating temperature correction parameter.

[0085] In the second embodiment, after sending a request to increase the temperature of the heat exchange medium to the host 1, the steps include:

[0086] The temperature of the heat exchange medium output by host 1 is increased by a fixed step parameter;

[0087] After sending a request to lower the temperature of the heat exchange medium to the host 1, the steps include:

[0088] The temperature of the heat exchange medium output by host 1 decreases by a fixed step parameter.

[0089] The air conditioning system and the air conditioning system temperature control method provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A temperature control method for an air conditioning system, characterized in that: It includes a host (1) and a communication line (4); The control method steps include: The host (1) operates in cooling mode or heating mode according to the indoor ambient temperature; Obtaining the average temperature of the indoor environment via the communication line (4); The indoor environment average temperature is compared with a preset temperature range. If the indoor environment average temperature meets the preset temperature requirement, a request to keep the temperature of the heat exchange medium unchanged is sent to the host (1). If the indoor environment average temperature does not meet the preset temperature requirement, a request to change the temperature of the heat exchange medium is sent to the host (1).

2. The air conditioning system temperature control method according to claim 1, characterized in that: The step of comparing the average temperature of the indoor environment with the preset temperature range comprises the following steps: In cooling mode, the indoor environment average temperature is compared with the cooling preset temperature range. If the indoor environment average temperature is greater than the cooling preset temperature range, a request to reduce the temperature of the heat exchange medium is sent to the host (1); if the indoor environment average temperature is less than the cooling preset temperature range, a request to keep the temperature of the heat exchange medium unchanged is sent to the host (1); In the heating mode, the indoor environment average temperature is compared with the heating preset temperature range. If the indoor environment average temperature is lower than the heating preset temperature range, a request to increase the temperature of the heat exchange medium is sent to the host (1). If the indoor environment average temperature is higher than the heating preset temperature range, a request to keep the temperature of the heat exchange medium unchanged is sent to the host (1).

3. The air conditioning system temperature control method according to claim 2, characterized in that: It also includes a fan coil unit (2) and a control valve (3), and the control method includes: Obtaining an actual opening ratio of a control valve (3), wherein the control valve (3) is used to control the opening or closing of a pipeline for conveying heat exchange medium to the fan coil unit (2); In cooling mode, if the average temperature of the indoor environment is within the cooling preset temperature range, the actual opening ratio is compared with the preset opening ratio. If the actual opening ratio is greater than or equal to the preset opening ratio, a request to keep the temperature of the heat exchange medium unchanged is sent to the host (1); if the actual opening ratio is less than the preset opening ratio, a request to increase the temperature of the heat exchange medium is sent to the host (1); In the heating mode, if the average temperature of the indoor environment is within the preset heating temperature range, the actual opening ratio is compared with the preset opening ratio. If the actual opening ratio is greater than or equal to the preset opening ratio, a request to keep the temperature of the heat exchange medium unchanged is sent to the host (1); if the actual opening ratio is less than the preset opening ratio, a request to reduce the temperature of the heat exchange medium is sent to the host (1).

4. The air conditioning system temperature control method according to claim 3, characterized in that: The host (1) operates in cooling mode or heating mode, comprising the following steps: The initial temperature of the heat exchange medium is set, and the host (1) continuously delivers the heat exchange medium to the fan coil unit (2) at the initial temperature for a first preset time.

5. The air conditioning system temperature control method according to claim 4, characterized in that: The method of obtaining the average temperature of the indoor environment comprises the steps of: At every second preset time interval, the average temperature of the indoor environment is counted once, and is repeatedly compared with the cooling preset temperature range or the heating preset temperature range.

6. The air conditioning system temperature control method according to claim 5, characterized in that: The step of obtaining the actual opening ratio of the control valve (3) comprises the following steps: At every third preset time interval, the actual activation ratio is counted once, and is repeatedly compared with the preset activation ratio.

7. The air conditioning system temperature control method according to claim 6, characterized in that: The plurality of fan coil units (2) in different rooms send their respective heat exchange medium temperature requirements to the host (1); in cooling mode, the host (1) adjusts the output temperature according to the minimum temperature requirement; in heating mode, the host (1) adjusts the output temperature according to the maximum temperature requirement.

8. The air conditioning system temperature control method according to any one of claims 3 to 7, characterized in that: The method of sending a request to the host (1) to increase the temperature of the heat exchange medium comprises the following steps: The target temperature of the heat exchange medium is calculated by the formula, and the host (1) outputs the heat exchange medium according to the target temperature. The formula is: T 目标 =D1*[k*(A1*T 2 +B1*T +C1)] 2 +E1*k*(A1*T 2 +B1*T +C1)+F1 Among them, T 目标 is the target temperature of the heat exchange medium output by the host (1), T is the real-time temperature of the heat exchange medium output by the host (1), k is the actual opening ratio of the control valve (3), and A1, B1, C1, D1, E1, and F1 are refrigeration temperature correction parameters; The method of sending a request to lower the temperature of the heat exchange medium to the host (1) comprises the following steps: The target temperature of the heat exchange medium is calculated by the formula, and the host (1) outputs the heat exchange medium according to the target temperature. The formula is: T 目标 =D2*[k*(A2*T 2 +B2*T +C2)] 2 +E2*k*(A2*T 2 +B2*T +C2)+F2 Among them, T 目标 is the target temperature of the heat exchange medium output by the host (1), T is the real-time temperature of the heat exchange medium output by the host (1), k is the actual opening ratio of the control valve (3), and A2, B2, C2, D2, E2, and F2 are heating temperature correction parameters.

9. The air conditioning system temperature control method according to any one of claims 3 to 7, characterized in that: The method of sending a request to the host (1) to increase the temperature of the heat exchange medium comprises the following steps: The temperature of the heat exchange medium output by the host (1) is increased by a fixed step parameter; The method of sending a request to lower the temperature of the heat exchange medium to the host (1) comprises the following steps: The temperature of the heat exchange medium output by the host (1) is reduced by a fixed step parameter.

10. An air conditioning system, comprising a host (1) and a plurality of fan coil units (2) distributed in a plurality of indoor environments, characterized in that: The host (1) transports heat exchange medium to each of the fan coil units (2) through a pipeline, and the pipelines connecting each of the fan coil units (2) are respectively provided with a control valve (3), and the temperature of the heat exchange medium in each of the fan coil units (2) is controlled according to the control method according to any one of claims 1 to 9.

Images