Dual variable water temperature control method for air conditioner water system

Abstract

The invention relates to the field of air conditioner water system temperature control, in particular to an air conditioner water system double variable water temperature control method. The real-time room temperature and the room temperature set value are detected in real time, the required duty ratio is obtained according to the time of the refrigeration or heating requirement corresponding to the mode in the room, and the set water temperature of the system heat pump main machine is adjusted according to the first temperature difference and the required duty ratio. A radiation water inlet temperature correction value is set according to the required duty ratio range, the first temperature difference and the range of the difference between the real-time temperature of a current room and the real-time temperature of the room before the collection period, and the set water temperature change and the radiation water inlet temperature change of the air conditioner water system are adjusted through the indoor temperature change; the problems that in the prior art, if the set temperature of the water temperature of a fixed value is not reasonable, the temperature control effect is not ideal easily, and when the water temperature of supplied water of a current radiant panel is controlled to be close to the dew point temperature conventionally, energy consumption is easily increased are solved.

Description

Technical Field

[0001] The invention relates to the field of temperature control of air conditioning water systems, and in particular to a dual variable water temperature control method for air conditioning water systems. Background Art

[0002] At present, the water temperature setting temperature of the heat pump main unit of the central air-conditioning water system installed in most buildings in the city is a fixed value, which needs to be manually adjusted according to demand. However, in actual operation, the indoor load will change according to the outdoor environment and the number of people indoors. If the water temperature setting temperature is set unreasonably, on the one hand, it will cause the heat pump main unit to run at full load all the time, causing unnecessary energy waste. On the other hand, it will cause the indoor temperature to fail to reach expectations and fail to achieve the preset cooling or heating effect indoors.

[0003] In addition, the current control of the water supply temperature of the radiation panel is generally controlled near the dew point temperature. Although this can achieve the effect of cooling and anti-condensation, it will make people feel uncomfortable in some low-humidity environments and is not energy-saving. In addition, the radiation water valve will be closed during operation, and the water temperature fluctuates greatly, which has a great impact on the entire air-conditioning system. The air conditioner cannot automatically control the operating load of the unit according to the indoor temperature, which wastes resources and increases energy consumption. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a dual variable water temperature control method for an air-conditioning water system, which solves the problem in the prior art that if the water temperature setting temperature is unreasonable and the temperature control effect is not ideal, and the current radiation panel water supply water temperature is conventionally controlled near the dew point temperature, it is easy to increase energy consumption.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A dual variable water temperature control method for an air conditioning water system, the method comprising the following steps:

[0007] S1. Periodically obtain the real-time temperature of all rooms with thermostats turned on, the duration corresponding to different real-time temperatures, the temperature setting value, the current radiation water inlet temperature and the current water temperature setting value, as well as basic data in cooling mode or heating mode;

[0008] S2. Calculate, based on the basic data, the ratio of the time during which the room has a cooling or heating demand corresponding to the current mode to the collection period to obtain a demand duty cycle;

[0009] S3, calculating the first temperature difference between the real-time temperature and the temperature setting value, and setting the water temperature correction value according to the required duty cycle range, the cooling and heating mode of the room and the first temperature difference, and calculating the sum of the water temperature setting value and the water temperature correction value to obtain the water temperature adjustment value and sending it to the heat pump host;

[0010] S4. Set the radiation inlet water temperature correction value according to the demand duty cycle range, the first temperature difference, and the difference between the current room's real-time temperature and the room's real-time temperature before the collection cycle, and calculate the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and send it to the water mixing center.

[0011] Preferably, in step S2, the following steps are specifically included:

[0012] S21, defining the demand in the cooling mode as the real-time temperature in the room being greater than or equal to the temperature setting value;

[0013] S22, defining the demand in the heating mode as the real-time temperature in the room being less than or equal to the temperature setting value;

[0014] S23. Calculate the ratio of the time with demand to the total time of the collection cycle in the current collection cycle to obtain the demand duty cycle.

[0015] Preferably, in step S3, the following steps are specifically included:

[0016] S31, calculating the difference between the real-time temperature in the room and the temperature setting value to obtain a first temperature difference;

[0017] The calculation formula for the first temperature difference is:

[0018] ΔT1=T SPT -T SPTSet

[0019] In the above formula, ΔT1 represents the first temperature difference, T SPT Indicates the real-time temperature in the room, T SPTSet Indicates the temperature setting value;

[0020] S32, determining whether the room is in cooling mode;

[0021] If yes, proceed to step S33;

[0022] If not, proceed to step S36;

[0023] S33, determining whether the demand duty cycle is equal to 1;

[0024] If yes, proceed to step S34;

[0025] If not, proceed to step S35;

[0026] S34, setting a first temperature difference threshold and a first compensation value, and determining whether the first temperature difference is less than or equal to the first temperature difference threshold;

[0027] If so, set the water temperature correction value to 0;

[0028] If not, the water temperature correction value is set to the first compensation value;

[0029] S35, setting a first demand duty cycle threshold and a second compensation value, and determining whether the demand duty cycle is less than the first demand duty cycle threshold;

[0030] If so, the water temperature correction value is set to the second compensation value;

[0031] If not, set the water temperature correction value to 0;

[0032] S36, determining whether the demand duty cycle is equal to 1;

[0033] If yes, proceed to step S37;

[0034] If not, proceed to step S38;

[0035] S37, setting a second temperature difference threshold and a third compensation value, and determining whether the first temperature difference is greater than or equal to the second temperature difference threshold;

[0036] If so, set the water temperature correction value to 0;

[0037] If not, the water temperature correction value is set to the first compensation value;

[0038] S38, setting a second demand duty cycle threshold and a fourth compensation value, and determining whether the demand duty cycle is less than the second demand duty cycle threshold;

[0039] If so, setting the water temperature correction value to the fourth compensation value;

[0040] If not, set the water temperature correction value to 0;

[0041] S39, calculating the sum of the water temperature correction value and the water temperature setting value to obtain the water temperature adjustment value, and sending it to the heat pump host.

[0042] Preferably, in step S4, the following steps are specifically included:

[0043] S41, determining whether the room is in cooling mode and the demand duty cycle is 1;

[0044] If yes, proceed to step S42;

[0045] If not, then end;

[0046] S42, calculating the difference between the current real-time room temperature and the real-time room temperature before the acquisition period to obtain a second temperature difference;

[0047] S43, setting a first radiation water inlet temperature compensation value and a second radiation water inlet temperature compensation value;

[0048] S44, determining whether the first temperature difference is less than or equal to a third temperature difference threshold;

[0049] If yes, proceed to step S45;

[0050] If not, proceed to step S46;

[0051] S45, setting a fifth threshold, and determining whether the second temperature difference is less than or equal to the fifth threshold;

[0052] If so, the radiation inlet water temperature correction value is set to the first radiation inlet water temperature compensation value;

[0053] If not, then the radiation inlet water temperature correction value is set to the second radiation inlet water temperature compensation value;

[0054] S46, setting the radiation water inlet temperature correction value to a second radiation water inlet temperature compensation value;

[0055] S47, calculating the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and then sending it to the water mixing center.

[0056] Compared with the prior art, the present invention provides a dual variable water temperature control method for an air conditioning water system, which has the following beneficial effects:

[0057] 1. The present invention detects the real-time room temperature and the room temperature setting value in real time, obtains the demand duty cycle according to the time when the cooling or heating demand corresponding to the mode exists in the room, and adjusts the set water temperature of the system heat pump host according to the first temperature difference and the demand duty cycle to ensure that the operation of the heat pump host can meet the indoor load demand.

[0058] 2. The present invention sets the radiation water inlet temperature correction value according to the demand duty cycle range, the first temperature difference, and the difference between the current room's real-time temperature and the room's real-time temperature before the collection cycle, and adjusts the air-conditioning water system to set the water temperature change and the radiation water inlet temperature change according to the indoor temperature change, thereby reducing the redundant energy consumption of the air conditioner under different load conditions, saving energy while ensuring the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0060] Figure 1 The present invention is a flow chart of the dual variable water temperature control method for the air conditioning water system. DETAILED DESCRIPTION

[0061] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0062] Those skilled in the art can understand that all or part of the steps in the following embodiments can be completed by instructing the relevant hardware through a program, so the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application can be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0063] In order to solve the problem in the prior art that if the water temperature setting temperature is unreasonable and the temperature control effect is not ideal, and the current radiation panel water supply temperature is usually controlled near the dew point temperature, it is easy to increase the energy consumption, the present invention provides a dual variable water temperature control method for an air conditioning water system, which detects the real-time room temperature and the room temperature setting value in real time, adjusts the set water temperature of the system heat pump host and the radiation water inlet target water temperature according to the indoor temperature change difference, and adjusts the air conditioning water system set water temperature change and the radiation water inlet temperature change according to the indoor temperature change, thereby reducing the redundant energy consumption of the air conditioner under different load conditions, saving energy and ensuring the user's comfort. The method specifically includes the following steps:

[0064] S1. Periodically obtain the real-time temperature of all rooms with thermostats turned on, the duration corresponding to different real-time temperatures, the temperature setting value, the current radiation water inlet temperature and the current water temperature setting value, as well as basic data in cooling mode or heating mode;

[0065] S2. Calculate the ratio of the time when the room has cooling or heating demand corresponding to the mode in the room within the collection period to the collection period according to the basic data to obtain the demand duty cycle; for example, in the cooling mode, the collection period is set to 10 minutes. If the room thermostat has a room temperature of 27°C for 4 minutes and a room temperature of 25°C for 6 minutes within 10 minutes, and the room temperature setting value is 26°C, then the cooling demand time is 4 minutes, and the demand duty cycle is 4 / 10=0.4. Therefore, in step S2, the following steps are specifically included:

[0066] S21, defining the demand in the cooling mode as the real-time temperature in the room being greater than or equal to the temperature setting value;

[0067] S22, defining the demand in the heating mode as the real-time temperature in the room being less than or equal to the temperature setting value;

[0068] S23. Calculate the ratio of the time with demand to the total time of the collection cycle in the current collection cycle to obtain the demand duty cycle.

[0069] S3, calculating the first temperature difference between the real-time temperature and the temperature setting value, and setting the water temperature correction value according to the required duty cycle range, the cooling and heating mode of the room and the first temperature difference, and calculating the sum of the water temperature setting value and the water temperature correction value to obtain the water temperature adjustment value and sending it to the heat pump host;

[0070] In step S3, the following steps are specifically included:

[0071] S31, calculating the difference between the real-time temperature in the room and the temperature setting value to obtain a first temperature difference;

[0072] The calculation formula for the first temperature difference is:

[0073] ΔT1=SPT-SPTSet

[0074] In the above formula, ΔT1 represents the first temperature difference, SPT represents the real-time temperature in the room, and SPTSet represents the temperature setting value;

[0075] S32, determining whether the room is in cooling mode;

[0076] If yes, proceed to step S33;

[0077] If not, proceed to step S36;

[0078] S33, determining whether the demand duty cycle is equal to 1;

[0079] If yes, proceed to step S34;

[0080] If not, proceed to step S35;

[0081] S34, setting a first temperature difference threshold and a first compensation value, and determining whether the first temperature difference is less than or equal to the first temperature difference threshold; in actual use, the first temperature difference threshold is generally set to 0.5°C, and the first compensation value is generally set to -0.5°C;

[0082] If so, set the water temperature correction value to 0;

[0083] If not, the water temperature correction value is set to the first compensation value;

[0084] S35, setting a first demand duty cycle threshold and a second compensation value, and determining whether the demand duty cycle is less than the first demand duty cycle threshold; the first demand duty cycle threshold is set to 0.7 when actually used, and the second compensation value is set to 0.5°C.

[0085] If so, the water temperature correction value is set to the second compensation value;

[0086] If not, set the water temperature correction value to 0;

[0087] S36, determining whether the demand duty cycle is equal to 1;

[0088] If yes, proceed to step S37;

[0089] If not, proceed to step S38;

[0090] S37, setting a second temperature difference threshold and a third compensation value, and determining whether the first temperature difference is greater than or equal to the second temperature difference threshold; in actual use, the second temperature difference threshold is generally set to -0.5°C, and the third compensation value is generally set to 0.5°C;

[0091] If so, set the water temperature correction value to 0;

[0092] If not, the water temperature correction value is set to the first compensation value;

[0093] S38, setting a second demand duty cycle threshold and a fourth compensation value, and determining whether the demand duty cycle is less than the second demand duty cycle threshold; the first demand duty cycle threshold is set to 0.7 when actually used, and the fourth compensation value is set to -0.5°C.

[0094] If so, setting the water temperature correction value to the fourth compensation value;

[0095] If not, set the water temperature correction value to 0;

[0096] S39, calculating the sum of the water temperature correction value and the water temperature setting value to obtain the water temperature adjustment value, and sending it to the heat pump host.

[0097] In general, in cooling mode, it can be summarized as shown in Table 1, and in heating mode, it can be summarized as shown in Table 2.

[0098]

[0099]

[0100] In Table 1, Ton: the time when there is demand after the room thermostat is turned on within the collection period (taking 10 minutes as an example), in minutes;

[0101] △T is the first temperature difference;

[0102] The cooling duty cycle “on demand” is defined as SPT ≥ SPTSet;

[0103] The cooling duty cycle “no demand” is defined as SPT<SPTSet;

[0104] Heating duty cycle "on demand" definition: when SPT ≤ SPTSet;

[0105] Heating duty cycle “no demand” definition: when SPT>SPTSet;

[0106] SPT: real-time room temperature;

[0107] SPTSet: room set temperature;

[0108] FixC: Set water temperature correction value in cooling mode;

[0109] FixH: set water temperature correction value in heating mode;

[0110] S4. Set the radiation inlet water temperature correction value according to the demand duty cycle range, the first temperature difference, and the difference between the current room's real-time temperature and the room's real-time temperature before the collection cycle, and calculate the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and send it to the water mixing center.

[0111] In step S4, the following steps are specifically included:

[0112] S41, determining whether the room is in cooling mode and the demand duty cycle is 1;

[0113] If yes, proceed to step S42;

[0114] If not, then end;

[0115] S42, calculating the difference between the current real-time room temperature and the real-time room temperature before the acquisition period to obtain a second temperature difference;

[0116] S43, setting a first radiation water inlet temperature compensation value and a second radiation water inlet temperature compensation value;

[0117] S44, determining whether the first temperature difference is less than or equal to a third temperature difference threshold; the third temperature difference threshold is generally set to 0.5°C;

[0118] If yes, proceed to step S45;

[0119] If not, proceed to step S46;

[0120] S45, setting a fifth threshold, and determining whether the second temperature difference is less than or equal to the fifth threshold; the fifth threshold is generally 0°C, and the first radiation water inlet temperature compensation value and the second radiation water inlet temperature compensation value are 0.5°C and -0.5°C respectively;

[0121] If so, the radiation inlet water temperature correction value is set to the first radiation inlet water temperature compensation value;

[0122] If not, then the radiation inlet water temperature correction value is set to the second radiation inlet water temperature compensation value;

[0123] S46, setting the radiation water inlet temperature correction value to a second radiation water inlet temperature compensation value;

[0124] S47, calculating the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and then sending it to the water mixing center.

[0125] The method mentioned in step S4 can be summarized in Table 3 below,

[0126]

[0127] In Table 3:

[0128] Ton: The time when the room thermostat is turned on and there is demand within the collection cycle (taking 10 minutes as an example), in minutes;

[0129] △T is the second temperature difference;

[0130] △SPT=SPT-SPT(previous);

[0131] SPT(previous): the real-time room temperature before the temperature collection cycle;

[0132] FixD is the correction value of the radiation inlet water temperature;

[0133] The cooling duty cycle “on demand” is defined as SPT ≥ SPTSet;

[0134] The cooling duty cycle “no demand” is defined as SPT<SPTSet;

[0135] Through the method mentioned in the present invention, the outlet water temperature of the heat pump host can be set according to the real-time indoor temperature to ensure that the operation of the heat pump host can meet the indoor load demand; the radiation water inlet temperature can also be adjusted through the mixing water center according to the real-time indoor temperature demand and dew point temperature. During operation, there is no need to close the radiation panel water valve in the room. By adjusting the radiation water inlet temperature, the radiation panel cooling demand under different load demands can be met.

[0136] In order to facilitate understanding of the contents mentioned in the present invention, the temperature acquisition cycle of 10 minutes is taken as an example to further illustrate the present solution:

[0137] Example 1: In cooling mode, only room 1 is turned on. Within 10 minutes of turning on the thermostat of room 1, the room temperature is 27°C for 4 minutes and 25°C for 6 minutes. The room set temperature is 26°C. The current set water temperature is 10°C. Then Ton=4, Ton / 10=0.4, FixC=+0.5. At this time, the corrected set water temperature is 10+0.5=10.5°C. Then the set water temperature of 10.5°C is sent to the heat pump host.

[0138] Example 2: In cooling mode, only room 2 is turned on. Within 10 minutes of turning on the thermostat of room 2, the room temperature is 27°C for 2 minutes and 25°C for 8 minutes. The room set temperature is 26°C. The current set water temperature is 10°C. Then Ton=2, Ton / 10=0.2, FixC=0.5. At this time, the corrected set water temperature is 10+0.5=10.5°C. The set water temperature of 10.5°C is sent to the heat pump host.

[0139] Example 3: In cooling mode, only room 4 is turned on. Within 10 minutes of turning on the thermostat of room 4, the real-time temperature of the room is 26.4°C, the set temperature of the room is 26°C, and the current set water temperature is 10°C. Then Ton=10, Ton / 10=1, FixC=0. At this time, the corrected set water temperature is 10+0=10°C, and the set water temperature of the heat pump host remains unchanged.

[0140] Example 4: In cooling mode, only room 3 is turned on. Within 10 minutes of turning on the thermostat of room 3, the real-time temperature of the room is 27°C, the set temperature of the room is 26°C, and the current set water temperature is 10°C. Then Ton=10, Ton / 10=1, FixC=-0.5. At this time, the corrected set water temperature is 10-0.5=10°C, and the set water temperature of 9.5 is sent to the heat pump host.

[0141] Example 5: In cooling mode, when room 1 and room 2 are turned on at the same time, the correction value of room 1 is greater than the correction value of room 2. According to the principle of correction with the minimum value, the set temperature of room 2 is sent to the heat pump host, and the set water temperature of the heat pump host remains unchanged.

[0142] Example 6: In heating mode, only room 1 is turned on. Within 10 minutes of turning on the thermostat of room 1, the room temperature is 25°C for 4 minutes and 27°C for 6 minutes. The room set temperature is 26°C. The current set water temperature is 40°C. Then Ton=4, Ton / 10=0.4, FixH=-0.5. At this time, the corrected set water temperature is 40-0.5=39.5°C, and the set water temperature of 39.5 is sent to the heat pump host.

[0143] Example 7: In heating mode, only room 2 is turned on. Within 10 minutes of turning on the thermostat of room 2, the room temperature is 25°C for 8 minutes and 27°C for 2 minutes. The room set temperature is 26°C. The current set water temperature is 40°C. Then Ton=8, Ton / 10=0.8, FixH=0. At this time, the corrected set water temperature is 40+0=40°C, and the set water temperature of the heat pump host remains unchanged.

[0144] Example 8: In heating mode, only room 4 is turned on. Within 10 minutes of turning on the thermostat of room 4, the real-time temperature of the room is 26.4°C, the set temperature of the room is 26°C, and the current set water temperature is 40°C. Then Ton=10, Ton / 10=1, FixH=0. At this time, the corrected set water temperature is 40+0=40°C, and the set water temperature of the heat pump host remains unchanged.

[0145] Example 9: In heating mode, only room 3 is turned on. Within 10 minutes of turning on the thermostat of room 3, the real-time temperature of the room is 25°C, the set temperature of the room is 26°C, and the current set water temperature is 40°C. Then Ton=10, Ton / 10=1, FixH=+0.5. At this time, the corrected set water temperature is 40+0.5=40.5°C, and the set water temperature of 40.5.5 is sent to the heat pump host.

[0146] Example 10: In heating mode, when room 1 and room 2 are turned on at the same time, the correction value of room 1 is less than the correction value of room 2. According to the principle of correction based on the maximum value, the set temperature of room 2 is sent to the heat pump host, and the set water temperature of the heat pump host remains unchanged.

[0147] Example 11: In cooling mode, only room 1 is turned on. Within 10 minutes after the room 1 thermostat is turned on, the room temperature 10 minutes ago is 26.2, the real-time room temperature is 26.4℃, the relative humidity is 55%, the dew point temperature is 16.5℃, the room set temperature is 26℃, and the radiation inlet water temperature is 18℃. Then FixD = -0.5℃, and the radiation inlet water target temperature of 18℃-0.5 = 17.5℃ is sent to the mixing water center.

[0148] Example 12: In cooling mode, only room 2 is turned on. Within 10 minutes after the room 2 thermostat is turned on, the room temperature 10 minutes ago is 26.7, the real-time room temperature is 26.4℃, the relative humidity is 55%, the dew point temperature is 16.5℃, the room set temperature is 26℃, and the radiation inlet water temperature is 18℃. Then FixD = +0.5℃, and the radiation inlet water target temperature of 18℃+0.5=18.5℃ is sent to the mixing water center.

[0149] Example 13: In cooling mode, only room 3 is turned on. Within 10 minutes of turning on the thermostat of room 2, the real-time room temperature is 26.7°C, the relative humidity is 55%, the dew point temperature is 16.5°C, the room set temperature is 26°C, and the radiation inlet water temperature is 18°C. Then FixD = -0.5°C, and the radiation inlet water target temperature of 18°C ​​- 0.5 = 17.5°C is sent to the mixing water center.

[0150] Example 14: In cooling mode, when room 1 and room 2 are turned on at the same time, the correction value of room 1 is less than that of room 2. According to the principle of correction with the minimum correction value, the target temperature of the radiant water inlet of room 1, 18°C ​​- 0.5 = 17.5°C, is sent to the mixing water center.

[0151] The above implementation methods have been described in detail. 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. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A dual variable water temperature control method for an air conditioning water system, characterized in that: The method comprises the following steps: S1. Periodically obtain the real-time temperature of all rooms with thermostats turned on, the duration corresponding to different real-time temperatures, the temperature setting value, the current radiation water inlet temperature and the current water temperature setting value, as well as basic data in cooling mode or heating mode; S2. Calculate, based on the basic data, the ratio of the time during which the room has a cooling or heating demand corresponding to the current mode to the collection period to obtain a demand duty cycle; S3, calculating the first temperature difference between the real-time temperature and the temperature setting value, and setting the water temperature correction value according to the required duty cycle range, the cooling and heating mode of the room and the first temperature difference, and calculating the sum of the water temperature setting value and the water temperature correction value to obtain the water temperature adjustment value and sending it to the heat pump host; S4. Set the radiation inlet water temperature correction value according to the demand duty cycle range, the first temperature difference, and the difference between the current room's real-time temperature and the room's real-time temperature before the collection cycle, and calculate the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and send it to the water mixing center.

2. A dual variable water temperature control method for an air conditioning water system according to claim 1, characterized in that: In step S2, the following steps are specifically included: S21, defining the demand in the cooling mode as the real-time temperature in the room being greater than or equal to the temperature setting value; S22, defining the demand in the heating mode as the real-time temperature in the room being less than or equal to the temperature setting value; S23. Calculate the ratio of the time with demand to the total time of the collection cycle in the current collection cycle to obtain the demand duty cycle.

3. A dual variable water temperature control method for an air conditioning water system according to claim 1, characterized in that: In step S3, the following steps are specifically included: S31, calculating the difference between the real-time temperature in the room and the temperature setting value to obtain a first temperature difference; The calculation formula for the first temperature difference is: ΔT1=T SPT -T SPTSet In the above formula, ΔT1 represents the first temperature difference, T SPT Indicates the real-time temperature in the room, T SPTSet Indicates the temperature setting value; S32, determining whether the room is in cooling mode; If yes, proceed to step S33; If not, proceed to step S36; S33, determining whether the demand duty cycle is equal to 1; If yes, proceed to step S34; If not, proceed to step S35; S34, setting a first temperature difference threshold and a first compensation value, and determining whether the first temperature difference is less than or equal to the first temperature difference threshold; If so, set the water temperature correction value to 0; If not, the water temperature correction value is set to the first compensation value; S35, setting a first demand duty cycle threshold and a second compensation value, and determining whether the demand duty cycle is less than the first demand duty cycle threshold; If so, the water temperature correction value is set to the second compensation value; If not, set the water temperature correction value to 0; S36, determining whether the demand duty cycle is equal to 1; If yes, proceed to step S37; If not, proceed to step S38; S37, setting a second temperature difference threshold and a third compensation value, and determining whether the first temperature difference is greater than or equal to the second temperature difference threshold; If so, set the water temperature correction value to 0; If not, the water temperature correction value is set to the first compensation value; S38, setting a second demand duty cycle threshold and a fourth compensation value, and determining whether the demand duty cycle is less than the second demand duty cycle threshold; If so, setting the water temperature correction value to the fourth compensation value; If not, set the water temperature correction value to 0; S39, calculating the sum of the water temperature correction value and the water temperature setting value to obtain the water temperature adjustment value, and sending it to the heat pump host.

4. A dual variable water temperature control method for an air conditioning water system according to claim 1, characterized in that: In step S4, the following steps are specifically included: S41, determining whether the room is in cooling mode and the demand duty cycle is 1; If yes, proceed to step S42; If not, then end; S42, calculating the difference between the current real-time room temperature and the real-time room temperature before the acquisition period to obtain a second temperature difference; S43, setting a first radiation water inlet temperature compensation value and a second radiation water inlet temperature compensation value; S44, determining whether the first temperature difference is less than or equal to a third temperature difference threshold; If yes, proceed to step S45; If not, proceed to step S46; S45, setting a fifth threshold, and determining whether the second temperature difference is less than or equal to the fifth threshold; If so, the radiation inlet water temperature correction value is set to the first radiation inlet water temperature compensation value; If not, then the radiation inlet water temperature correction value is set to the second radiation inlet water temperature compensation value; S46, setting the radiation water inlet temperature correction value to a second radiation water inlet temperature compensation value; S47, calculating the sum of the radiation inlet water temperature and the radiation inlet water temperature correction value to obtain the radiation inlet water temperature adjustment value and then sending it to the water mixing center.

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