An air conditioning system automatically adjusting water temperature and a control method thereof

Abstract

The application provides an air conditioning system capable of automatically adjusting water temperature and a control method thereof. The method is used for controlling N air conditioning units and comprises the following steps: (1) obtaining an average indoor temperature difference of air conditioning units in an open state among the N air conditioning units and an average indoor temperature change rate of the air conditioning units in the open state; (2) obtaining a target water temperature control parameter according to the average indoor temperature difference and the average indoor temperature change rate; and (3) adjusting the water temperature of an outdoor unit according to the target water temperature control parameter and a current temperature control cycle length. Compared with a control mode in which a target water temperature is calculated according to an average value of a difference between an actual temperature and a set temperature of each room, the control system can realize real-time sensing of a load change rate of each room, adjust a weight of each room for target water temperature calculation, and make the calculation of the target water temperature not completely depend on a room temperature setting of a user.

Description

Technical Field

[0001] This application relates to an air conditioning system, and more particularly to a system and method for automatically regulating the water temperature in an air conditioning system.

[0002] Background section

[0003] Currently, chilled water (heat pump) air conditioning systems adopt an integrated design of air conditioning and underfloor heating. The indoor side uses fan coil units for cooling and buried pipes or radiators for heating, compared to traditional multi-split air conditioning systems with boilers. In terms of system composition, the outdoor unit of the air conditioning system often uses an air-cooled inverter chilled water (heat pump) unit to produce chilled or hot water, which is then transmitted through distribution pipelines to indoor heat exchangers (such as indoor fan coil units or underfloor heating pipes) to exchange heat with the indoor air to achieve the purpose of regulating indoor air temperature and humidity. Summary of the Invention

[0004] In traditional control systems, the outdoor chiller (heat pump) unit independently regulates energy (unit start / stop, variable frequency drive, etc.) based on its inlet and outlet water temperatures. The indoor heat exchanger is controlled based on the room temperature detected by its thermostat (indoor fan start / stop, water circuit solenoid valve on / off, etc.). In this system, the user needs to set both the target water temperature for the outdoor unit and the target room temperature for the indoor thermostat. While the target room temperature setting can often be adjusted based on the user's actual experience, the effect of the target water temperature setting cannot be directly perceived by the user. For example, in cooling mode, setting the target water temperature too low will result in higher energy consumption for the outdoor unit, while setting it too high will prevent the indoor unit from meeting the customer's desired conditions for an extended period.

[0005] Although using the average temperature of all rooms in a building as a parameter enables automatic control of the outdoor chiller (heat pump) unit's temperature, the inventors' observations and analysis revealed that in this control scheme, improper temperature settings in individual rooms can lead to an unreasonable selection of the calculated target water temperature. Furthermore, different room sizes and loads result in varying needs for each room. If users set inappropriate room temperatures, the resulting unsuitable target water temperatures will lead to poor performance in achieving the target room temperature, hindering optimal control over comfort and energy efficiency.

[0006] To address the above issues, this application provides a method and system for controlling water temperature. By sensing the load change rate of each room in real time, the weight of each room in the calculation of the target water temperature is adjusted, so that the calculation of the target water temperature does not completely depend on the user's room temperature setting.

[0007] According to a first aspect of this application, a method for controlling water temperature is provided for controlling N air conditioning units, characterized by the following steps: S01, obtaining the average indoor temperature difference of the N air conditioning units and obtaining the average indoor temperature change rate of the N air conditioning units; S02, obtaining a target water temperature control parameter based on the average indoor temperature difference and the average indoor temperature change rate; S03, controlling the water temperature of the outdoor unit based on the target water temperature control parameter; S04, setting a cyclic temperature control cycle. Steps S01-S03 are performed within the cyclic temperature control cycle.

[0008] According to the first aspect of this application, the time length in the cyclic temperature control cycle is obtained based on the average indoor temperature difference of the current temperature control cycle, the first temperature control cycle in the temperature control cycle is preset, and the first target water temperature control parameter is also preset.

[0009] According to a first aspect of this application, step S01 further includes the following steps: obtaining a weight p, wherein the weight p participates in the calculation of the average indoor temperature difference, and wherein the weight p is negatively correlated with the absolute value of the rate of change of indoor temperature for each air conditioning unit; obtaining a weight q, wherein the weight q participates in the calculation of the rate of change of indoor temperature, and wherein the weight q is positively correlated with the absolute value of the indoor temperature difference for each air conditioning unit.

[0010] According to the first aspect of this application, step S04 further includes the following steps: determining the range in which the absolute value of the average indoor temperature difference of the N air conditioning units is located, and reading the duration of the next temperature control cycle from the index table according to the range.

[0011] According to the first aspect of this application, all N air conditioning units are in the open state, or only some of them are in the open state.

[0012] According to another aspect of this application, an air conditioning system is provided, comprising N air conditioning units, characterized in that it includes: a unit; N thermostats, each of the N air conditioning units including one of the N thermostats, one of the N thermostats being used to provide an indoor temperature parameter and a target indoor temperature parameter for the corresponding air conditioning unit; a controller, the controller receiving the indoor temperature parameter and the target indoor temperature parameter provided by one or more of the N thermostats, obtaining the average indoor temperature difference of one or more of the N air conditioning units, obtaining the average indoor temperature change rate of one or more of the N air conditioning units, and obtaining a target water temperature parameter based on the average indoor temperature difference and the average indoor temperature change rate of the indoor temperature parameter and the target indoor temperature parameter, and controlling the water temperature of the unit according to the target water temperature parameter.

[0013] According to another aspect of this application, the controller obtains indoor temperature difference parameters for one or more of N rooms based on the indoor temperature parameter and the target indoor temperature parameter, and obtains a cyclic temperature control cycle based on the average value of the indoor temperature difference parameters for one or more of the N rooms. Within the cyclic temperature control cycle, the controller controls the water temperature of the outdoor unit based on the target water temperature parameter. The controller controls the water temperature of the unit at each of the cyclic temperature control cycles, wherein the duration of the next temperature control cycle is obtained based on the average value of the indoor temperature difference parameters for one or more of the N rooms obtained in the previous temperature control cycle.

[0014] According to another aspect of this application, the air conditioning system further includes: N fan coil units and water pipes, each of the N air conditioning units including one of the N fan coil units, the water pipes passing through N rooms, the water pipes connecting the unit and the N fan coil units to form a water flow loop between the unit and the N fan coil units, thereby enabling each of the N fan coil units to exchange heat with a corresponding room in the N rooms. Each of the N fan coil units includes a fan coil solenoid valve, the fan coil solenoid valve being used to control the opening and closing of a corresponding section of the water pipe, and the controller controlling the opening and closing of the fan coil solenoid valve. Attached Figure Description

[0015] These and other features and advantages of this application can be better understood by reading the following detailed description with reference to the accompanying drawings, in which the same reference numerals denote the same parts, wherein:

[0016] Figure 1 This is a block diagram of the air conditioning system of this application;

[0017] Figure 2 yes Figure 1 The structural diagram of the specific components of the air conditioning system block diagram shown;

[0018] Figure 3 This is a control flowchart of the air conditioning system of this application, which describes the steps to implement this application;

[0019] Figure 4 yes Figure 3 More specific steps for calculating the average indoor temperature difference and the average indoor temperature change rate in the control flowchart of the air conditioning system;

[0020] Figure 5 yes Figure 3 More specific steps for calculating the target temperature control cycle are shown in the control flowchart of the air conditioning system.

[0021] Figure 6 This is a block diagram of the controller of the air conditioning system of this application, showing the specific components and connections of the controller. Detailed Implementation

[0022] Specific embodiments of this application will now be described with reference to the accompanying drawings. It should be understood that, where possible, the same or similar reference numerals used in this application refer to the same parts.

[0023] It is worth noting that the air conditioning system of this application is suitable for operating in multiple modes, including but not limited to cooling mode (target set temperature is lower than ambient temperature) and heating mode (target set temperature is higher than ambient temperature).

[0024] Figure 1 This diagram illustrates a schematic logic block diagram of the air conditioning system 100 of this application, which shows the main functional modules of the software and hardware of the air conditioning system of this application.

[0025] like Figure 1 As shown, the air conditioning system 100 of this application includes: N air conditioning units (e.g., N rooms) (101, 102, ..., 10N), a unit 162 (e.g., a chilled water (heat pump) unit installed outside the N rooms), a system controller 170, and water pipes 164. The system controller 170 collects temperature parameters from the N air conditioning units that are in the open state, generates temperature control parameters based on the collected temperature parameters, and controls (or adjusts) the water temperature in the unit 162 based on the temperature control parameters. The water pipes 164 are fluidly connected to the unit 162, and the water pipes 164 are controllably connected to the corresponding fan coil units (201, 202, ..., 20N) located in the N rooms (see [reference]). Figure 2 The system generates water through unit 162 and N fan coil units (201, 202, ..., 20N), forming a water flow loop that allows N rooms to exchange heat with their corresponding N fan coil units (201, 202, ..., 20N). Since the system controller 170 controls the water temperature of unit 162 within a cyclic temperature control period, the temperature parameters in the N rooms are referenced using the temperature control period ti (i = 1, 2, ...) as the reference time.

[0026] It should be noted that, in Figure 1 In the module control described herein, the parameters collected and calculated by the system controller 170 are for air conditioning units that are in the open state (the air conditioning unit is in the open state when the power button is pressed on the thermostat); the system controller 170 does not collect and process (or calculate) the temperature parameters of air conditioning units that are not in the open state.

[0027] Therefore, for ease of description and understanding, in the description Figure 1When the central controller 170 controls each functional module, it is assumed that all N air conditioning units are in the on state. Under this condition, the system controller 170 collects the temperature parameters of all N air conditioning units and processes (or calculates) the collected parameters. For the condition where some of the N air conditioning units are in the on state, the system controller 170 only collects the temperature parameters of the air conditioning units in the on state, skips the air conditioning units in the off state, and processes the collected temperature parameters in the same way.

[0028] Those skilled in the art should understand that the control principles of the system controller 170 for the functional modules described when all N air conditioning units are in the on-state are also applicable when the N air conditioning units are in the partially on-state. That is, when the N air conditioning units are in the partially on-state, the system controller 170 only collects the temperature parameters of the air conditioning units that are in the on-state, skips the air conditioning units that are in the off-state, and uses the same module function control method to process (or calculate) the collected temperature parameters.

[0029] refer to Figure 1 In period i (i = 1, 2, ...), the technical solution of this application processes N rooms as follows: (1) For room 1, the indoor temperature T is provided by its indoor temperature controller detector. i1 ; and provide the target indoor temperature T through user settings or automatic settings. gi1 (2) For room 2, the indoor temperature T is provided by its indoor temperature controller. i2 ; and provide the target indoor temperature T through user settings or automatic settings. gi2 For room N, the indoor temperature T is provided by its indoor temperature detector; ..., (n) in ; and provide the target indoor temperature T through user settings or automatic settings. gin .

[0030] Still for reference Figure 1 Within period i (i = 1, 2, ...), after receiving temperature parameters from N rooms, the system controller 170 processes the temperature parameters from the N rooms as follows:

[0031] (1) The indoor temperature difference ΔT is obtained through its module 131. i1 ; and through its module 141, the rate of change of indoor temperature dT is obtained. i1 (2) The indoor temperature difference ΔT is obtained through its module 132. i2 The rate of change of indoor temperature, dT, is obtained through its module 142. i2 ;…,(n) obtains the indoor temperature difference ΔT through its module 13N. in The rate of change of indoor temperature, dT, is obtained through its module 14N. in .

[0032] Still for reference Figure 1 Within period i (i = 1, 2, ...), the system controller 170 performs a weighted average of the temperature parameters for N rooms, as follows:

[0033] (1) Obtain the average temperature difference ΔT between N rooms through its module 152. i ;

[0034] (2) Obtain the average temperature change rate dT of N rooms through its module 152. i .

[0035] Still referencing Figure 1 After obtaining the average temperature difference ΔT between N rooms i and the average temperature change rate of N rooms Then, within period i (i = 1, 2, ...), the system controller 170 sets the average temperature difference of N rooms. and the average temperature change rate of N rooms The following steps were taken:

[0036] (1) Using its module 158, based on the average temperature difference ΔT of N rooms. i This gives the duration of the next cycle (i.e., cycle i+1). It should be noted that the duration of the next temperature control cycle is related to the absolute value of the average temperature difference between the N rooms |ΔT|. i | shows a positive correlation;

[0037] (2) Using its module 156, based on the average temperature difference ΔT of N rooms. i and the average temperature change rate of N rooms Obtain the target control water temperature change parameter;

[0038] (3) Through its module 160, based on the obtained target control water temperature change value parameter, the control water temperature parameter is used to control the unit 162.

[0039] Figure 2 Showing with Figure 1 The hardware block diagram corresponding to the logic block diagram of the air conditioning system 100 is used to illustrate the main functional modules of the hardware of the air conditioning system of this application. For example... Figure 2 As shown, with Figure 1 Similarly, the hardware structure diagram of the air conditioning system in this application includes: N air conditioning units (e.g., N rooms) (101, 102, ..., 10N), a unit 162, a system controller 170, and water pipes 164. Water pipes 164 are fluidly connected to unit 162 and pass through the N air conditioning units, thereby enabling water to flow controllably and in parallel through the N rooms. The system controller 170 connects to points B1, B2, ... B...n Temperature parameters are received from N air conditioning units, and control signals are generated based on these parameters to control and adjust the water temperature of unit 162 via connection point A.

[0040] refer to Figure 2 The air conditioning system of this application also includes: N fan coil units (201, 202, ..., 20N), N fan coil solenoid valves (211, 212, ..., 21N), and N thermostats (221, 222, ..., 22N). Each of the N air conditioning units (101, 102, ..., or 10N) includes a corresponding fan coil unit (201, 202, ..., or 20N), a corresponding fan coil solenoid valve (211, 212, ..., or 21N), and a corresponding thermostat (221, 222, ..., or 22N). Because water pipe 164 fluidly connects the unit 162 and all N fan coil units (201, 202, ..., 20N) to form a parallel water flow loop, water pipe 164 (252, 254) includes a water inlet side 252 and a water outlet side 254. Thus, each of the N air conditioning units (101, 102, ..., or 10N) contains a corresponding section of water pipe 164; this corresponding section has an inlet side section (261, 262, ..., 26N) and an outlet side section (271, 272, ..., 27N). In each air conditioning unit (101, 102, ..., or 10N), the corresponding fan coil unit is located near the corresponding water pipe section (or in the vicinity of the solenoid valve passage), allowing the fan coil unit to exchange heat with the corresponding room.

[0041] Now for reference Figure 2 This describes the connection relationships of the components in each room. Each of the N fan coil units has an inlet (231, 232, ..., or 23N) and an outlet (241, 242, ..., or 24N). The inlet (231, 232, ..., or 23N) of each fan coil unit is fluidly connected to the first end of its corresponding inlet section (261, 262, ..., or 26N). The outlet (241, 242, ..., or 24N) of each fan coil unit is fluidly connected to the first end of its corresponding solenoid valve (211, 212, ..., 21N). The second end of the corresponding solenoid valve (211, 212, ..., 21N) is fluidly connected to its corresponding outlet section (271, 272, ..., 27N). Thus, when the solenoid valve in an air conditioning unit is in the connected state, the corresponding pipe section of that air conditioning unit forms a water flow loop with unit 162; when the solenoid valve in an air conditioning unit is in the disconnected state, the water flow loop between that air conditioning unit and unit 162 is disconnected. The system controller 170 controls the connection or disconnection of N fan coil solenoid valves (211, 212, ..., 21N) through connection points C1, C2, ..., CN.

[0042] and description Figure 1 The reasons are similar, for ease of description and understanding Figures 3-5 When controller 170 operates on each process block in the process, let's assume that all N air conditioning units are in the powered-on state. Under this condition, system controller 170 collects the temperature parameters of all N air conditioning units and processes (or calculates) the collected parameters. For the condition where some of the N air conditioning units are in the powered-on state, system controller 170 only collects the temperature parameters of the air conditioning units in the powered-on state, skipping the air conditioning units in the powered-off state, and processes the collected temperature parameters in the same way.

[0043] Those skilled in the art should understand that the operating principles of the system controller 170 for each process module, when all N air conditioning units are in the on-state, also apply to the situation when the N air conditioning units are in the partially on-state. That is, when the N air conditioning units are in the partially on-state, the system controller 170 only collects the temperature parameters of the air conditioning units that are in the on-state, skips the air conditioning units that are in the off-state, and uses the same process operation control method to process (or calculate) the collected temperature parameters.

[0044] Figure 3 A flowchart 300 showing the control of the air conditioning system of this application is shown.

[0045] like Figure 3 As shown, in step 304, the system controller 170 sets the initial temperature control period t1 (typically t1 is 30 seconds) and sets temperature parameters for the initial temperature control period t1, including:

[0046] (1) Collect the indoor temperature (T) of N air conditioning units during the initial temperature control period t1. 11 ,T 12 ,…,T 1n );

[0047] (2) Set the target indoor temperature (T) of N air conditioning units at the initial temperature control period t1. g11 ,T g12 ,…,T g1n );

[0048] (3) Set the target water temperature T of unit 162 at the initial temperature control cycle t1. c1 (Typically, the initial target water temperature T is in cooling mode) c1 Set to 15 degrees Celsius, initial target water temperature T in heating mode. c1 (Set to 45 degrees Celsius).

[0049] After step 304 is completed, the process proceeds to step 306.

[0050] It should be noted that the indoor temperature difference ΔT obtained in this application i and the rate of change of indoor temperature dT i The parameters from two adjacent temperature control cycles must be used. Since the temperature parameters are not assigned during the first temperature control cycle when the air conditioning system starts operating, initial parameter settings are necessary. These settings can be done manually or generated by the system controller 170.

[0051] In step 306, the system controller 170 prepares for the next temperature control cycle, i.e., i = i + 1, indicating the start of the next temperature control cycle. In step 306, to determine the running time of the current temperature control cycle, the system controller 170 also records the start time of the current temperature control cycle. After step 306 is completed, the process proceeds to step 308.

[0052] In step 308, the system controller 170, during the current temperature control cycle, from Figure 2 The indoor temperature T is collected from N thermostats (221, 222, ..., 22N). i and target indoor temperature T gi After step 308 is completed, the process proceeds to step 310.

[0053] In step 310, the system controller 170, in the current temperature control cycle, based on the collected indoor temperature T of the current cycle... i and target indoor temperature T gi And the indoor temperature T of the previous cycle (i-1) To obtain the average indoor temperature difference and average room temperature change rate After step 310 is completed, the process proceeds to step 312.

[0054] In step 312, the system controller 170, during the current temperature control cycle, bases the temperature difference on the average indoor temperature difference. The duration of this temperature control cycle is obtained. Since the system controller 170 executes steps 306, 308, and 310 for a very short time, the running time is definitely still within the current temperature control cycle; there will be no situation where the running time exceeds the current temperature control cycle. After the operation in step 312 is completed, the process proceeds to step 314.

[0055] In step 314, the system controller 170, during the current temperature control cycle, bases the temperature difference on the average indoor temperature difference. and average room temperature change rate Determine the target control water temperature parameter T ciFor example, the target water temperature change value can be read from the following index table 1 pre-stored in the memory, and then the target water temperature parameter T can be calculated by combining it with the target water temperature of the previous period. ci It is worth noting that the adjustment parameters in Index Table 1 below apply to both cooling and heating modes.

[0056]

[0057] Index Table 1

[0058] After step 314 is completed, the process proceeds to step 316.

[0059] In step 316, the system controller 170 adjusts the water temperature in unit 162 according to the target water temperature control parameters during the current temperature control cycle, thereby adjusting the water temperature in water pipe 164. After the operation in step 316 is completed, the process proceeds to step 318.

[0060] In step 318, the system controller 170 compares the current running time with the start time of the current temperature control cycle to determine whether the temperature control time exceeds the length of the current running cycle. If it does not exceed the current temperature control cycle, the process proceeds to step 316 to continue adjusting the water temperature; if it exceeds the current cycle, the process proceeds to step 320 to start the next temperature control cycle.

[0061] In step 320, the system controller 170 determines whether to shut down the system during the current temperature control cycle (for example, the air conditioning system needs to be shut down for maintenance). If shutdown is required, the process proceeds to step 322 to perform the shutdown operation; if shutdown is not required, step 306 proceeds to the next temperature control cycle.

[0062] Figure 4 Show Figure 3 Detailed steps for step 310.

[0063] like Figure 4 As shown, in steps 402 and 404 executed sequentially, the system controller 170 reads the indoor temperature T from the previous cycle. (i-1) The duration t of the previous cycle (i-1) The indoor temperature T during this period i And the target indoor temperature T for this period gi After the sequential execution of steps 402 and 404 is completed, the process proceeds to steps 406 and 408.

[0064] In steps 406 and 408, which are executed sequentially, the system controller 170 determines the indoor temperature T from the previous cycle based on the collected data. (i-1) The duration t of the previous cycle (i-1)The indoor temperature T during this period i And the target indoor temperature T for this period gi Calculate the indoor temperature difference ΔT for each air conditioning unit using the following formula. i and the rate of change of indoor temperature dT in each air conditioning unit i :

[0065] ΔT i =T i -T gi ,

[0066]

[0067] After the sequential execution of steps 406 and 408 is completed, the process proceeds to steps 410 and 412.

[0068] In steps 410 and 412, which are executed sequentially, the calculation weight p of the temperature difference for each air conditioning unit is calculated according to the following formula. j The weight q is calculated based on the temperature change rate of each air conditioning unit. j :

[0069]

[0070] Satisfying p1+p2+…+p j +…+p n =1,

[0071] Where j represents the number of each air conditioning unit, n represents the total number of air conditioning units, and i represents the current temperature control cycle.

[0072]

[0073] Satisfying q1+q2+…+q j +…+q n =1,

[0074] Where j represents the number of each air conditioning unit, n represents the total number of air conditioning units, and i represents the current temperature control cycle.

[0075] It can be seen that the calculation weight p of the temperature difference of each air conditioning unit is related to the absolute value of the rate of change of indoor temperature of each air conditioning unit |dT i | is negatively correlated, meaning the rate of change of indoor temperature for each air conditioning unit is |dT i The larger the value of |, the smaller the weight of p, and the higher the rate of change of indoor temperature for each air conditioning unit |dT. i The smaller the value of |, the larger the weight of p. The rate of change of indoor temperature for each air conditioning unit is |dT. i| reflects the load of each room, such as the number of people and whether it receives direct sunlight. The higher the load of each room, the slower the cooling (heating) speed in the room, i.e., the rate of change of indoor temperature |dT for each air conditioning unit. i The smaller the value of |dT, the faster the cooling (heating) speed in each room. Conversely, the smaller the load on each room, the faster the cooling (heating) speed in the room, i.e., the rate of change of indoor temperature per air conditioning unit |dT. i The larger the value of |, the greater the weight p in the calculation of the average temperature difference of the air conditioning unit. Therefore, when calculating the weight p of the average temperature difference of the air conditioning unit, the greater the weight p of the temperature change rate |dT. i When the value of | is smaller (slower temperature adjustment, higher load), the air conditioning unit should be given a greater weight; when the rate of temperature change | dT i When the value of a function is larger (faster temperature adjustment, smaller load), the air conditioning unit should be assigned a smaller weight to meet the corresponding load requirements of each room.

[0076] The weighted average temperature change rate q for each air conditioning unit is calculated as the absolute value of the indoor temperature difference for each air conditioning unit |ΔT. i | is positively correlated, that is, the indoor temperature difference |ΔT in each air conditioning unit i The larger | is, the larger the weight q, and the larger the indoor temperature difference |ΔT i The smaller the |, the smaller the weight q. The indoor temperature difference |ΔT in each air conditioning unit. i | reflects the user load demand in each room, that is, how close the actual indoor temperature is to the user's target temperature. The further the actual indoor temperature is from the user's target temperature, the greater the corresponding indoor temperature difference |ΔT. i The larger the value of |, the greater the temperature difference |ΔT. Conversely, the closer the actual indoor temperature of each room is to the user's desired target temperature, the smaller the corresponding indoor temperature difference |ΔT. i The smaller the value of |, the less significant the temperature difference. Therefore, when calculating the weight q for the temperature change rate of the air conditioning unit, the indoor temperature difference |ΔT should be considered. i The larger the value | (the farther the load is from the target demand), the greater the weight should be given to the air conditioning unit; when the indoor temperature difference |ΔT i | The smaller the load (the closer it is to the target demand), the smaller the weight should be assigned to the air conditioning unit, so as to meet the corresponding load demand of each room.

[0077] After the operations in steps 410 and 412 are completed in sequence, the process proceeds to steps 414 and 416.

[0078] In steps 414 and 416, which are executed sequentially, the indoor temperature difference ΔT of each air conditioning unit is calculated based on steps 406 and 408. i and the rate of change of indoor temperature dT i The calculation weight p of the temperature difference for each air conditioning unit calculated in steps 410 and 412. j Calculate the weight q for the rate of temperature changej The average indoor temperature difference is calculated based on the following formula. and average room temperature change rate

[0079]

[0080] After steps 410 and 412 are completed sequentially, step 312 (calculating the target water temperature control period t) can be performed. i ) operation.

[0081] Figure 5 Show Figure 3 Detailed instructions for step 312.

[0082] like Figure 5 As shown, in step 502, the system controller 170 reads the storage memory 606 (see...). Figure 6 The average indoor temperature difference in) After the read operation is completed, the process proceeds to step 404.

[0083] In step 504, after obtaining the average indoor temperature difference Then, the system controller 170 can determine the average indoor temperature difference. The range of absolute values ​​is based on the average indoor temperature difference. The absolute value range is determined by reading the temperature control cycle t from the following index table 2 pre-stored in the system controller 170. i Duration.

[0084]

[0085] Index Table 2

[0086] It can be seen that the temperature control period t i The duration and the absolute value of the average indoor temperature difference There is a positive correlation, that is, the average indoor temperature difference The larger the temperature control cycle t, the longer the temperature control cycle t. i The longer the duration, the greater the average indoor temperature difference. The smaller the value, the shorter the temperature control cycle t. i The shorter the duration, the lower the average indoor temperature difference. This reflects the overall load demand of all rooms. The higher the overall load demand of all rooms, the greater the corresponding average indoor temperature difference. The larger the overall load demand of all rooms, the lower the average indoor temperature difference. The smaller the average indoor temperature difference, the better. Therefore, when calculating the duration of the temperature control cycle ti, the average indoor temperature difference should be considered. When the load is larger (the further the average load of all rooms is from the target demand), a longer temperature control cycle t should be assigned to all air conditioning units.i This reduces the frequency of adjustments when load demand is far from the target, avoiding frequent water temperature adjustments; when the average indoor temperature difference When the average load of all rooms is closer to the target demand, a shorter temperature control cycle t should be assigned to all air conditioning units. i This allows for a rapid response when load demand approaches the target, avoiding overshoot and over-adjustment.

[0087] The average indoor temperature difference above With temperature control cycle t i The correlation of duration is based on the initial target water temperature setting, which can enable the air conditioning system to operate under high load priority.

[0088] Those who are skilled in the art should understand that Figure 3 and Figure 4 The flowchart shown does not require that the steps be performed in the order shown. For example Figure 3 Steps 312 and 314 in the code can be executed in a different order. Figure 4 Steps 406 and 408, 410 and 412, 414 and 416 can be executed in a different order.

[0089] Figure 6 Show Figure 1 and Figure 2 The block diagram of system controller 170 shows the main components of system controller 170. System controller 170 is capable of storing and executing commands such as... Figure 3-5 The process, storage, and invocation shown are as follows: Figure 3 The parameters required for the process shown.

[0090] like Figure 6 As shown, the system controller 170 includes a bus 602, a processor 604, a memory 606, an input interface 608, and an output interface 610. The processor 604, memory 606, input interface 608, and output interface 610 are connected to the bus 1001. The processor 604 can read programs (or instructions) from the memory 606 and execute the programs (or instructions) to process data; the processor 604 can also write data or programs (or instructions) into the memory 606. The memory 606 can store programs (instructions) or data. By executing the instructions in the memory 606, the processor 604 can control the memory 606, the input interface 608, and the output interface 610. In this application, the memory 606 is capable of storing instructions for execution... Figure 2-5 The process shown includes the procedure and the running parameters required to execute the procedure.

[0091] The input interface 608 is configured to receive indoor temperature parameters and target indoor temperature parameters of each room, as well as the opening and closing parameters of each air conditioning unit, from thermostat 1, thermostat 2, ..., thermostat n, respectively, via connection lines 281, 282, ..., 28N. It also converts the data of these parameters into signals that can be recognized by the processor 604 and stores them in the memory 606.

[0092] The processor 604 is configured to calculate the target control water temperature parameter tci according to the program stored in the memory 606, and send the target water temperature control signal to the output interface 608. The processor 604 is also configured to generate an on / off signal for each air conditioning unit based on the indoor temperature parameters collected by the thermostats 221, 222, ..., 22N of each room, the target indoor temperature parameter, and the on / off parameters of the air conditioning unit. Specifically, if the indoor temperature parameter collected by the thermostat of a room is equal to the target indoor temperature parameter, the processor 604 generates an off signal for the air conditioning unit of that room; if the indoor temperature parameter collected by the thermostat of a room is not equal to the target indoor temperature parameter, the processor 604 generates an off signal for the air conditioning unit of that room.

[0093] Output interface 610 is configured to receive a target water temperature control signal from processor 604, convert the target water temperature control signal into a water temperature control signal suitable for unit 162, and output the target water temperature control signal to unit 162 for water temperature adjustment via connection line 280. Output interface 610 is also configured to receive the on / off signal of each air conditioning unit from processor 604, convert the signal into the on / off signals of fan coil units (201, 202, ..., 20N) and fan coil solenoid valves (211, 212, ..., 21N), and output the on / off signals of the fan coil units and fan coil solenoid valves of each room to the fan coil units (201, 202, ..., 20N) and the respective fan coil solenoid valves (211, 212, ..., 21N) via connection lines 291, 292, ..., 29N to control their opening and closing.

[0094] The air conditioning control system of this application has the following advantages over the air conditioning control systems in the prior art:

[0095] 1. Unlike independent control systems for indoor and outdoor units, the outdoor unit water temperature setting of this control system does not require user setting; the system automatically selects the target water temperature that optimizes overall performance and comfort.

[0096] 2. Compared with the control method that calculates the target water temperature by taking the average of the difference between the actual temperature and the set temperature of each room, this control system can sense the load change rate of each room in real time and adjust the weight of each room in the calculation of the target water temperature, so that the calculation of the target water temperature does not completely depend on the user's room temperature setting.

[0097] 3. Since the load demand of each user and each room changes in real time and is different, when the system itself cannot provide different water temperatures and different water flow rates, the determination of the average indoor temperature difference and the average indoor temperature change rate can take into account the load demand of all rooms.

[0098] 4. Not only can the target water temperature be adjusted in real time, but the target water temperature control cycle can also be adjusted accordingly based on load changes, thus achieving a balance between the optimization goals of stable control and response speed.

[0099] Although this application has been described with reference to examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary and not limiting; therefore, the disclosures herein may be used to solve other technical problems and have other technical effects and / or can solve other technical problems. Thus, the examples of embodiments of this application as set forth above are intended to be illustrative and not limiting. Various changes can be made without departing from the spirit or scope of this application. Therefore, this application is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents.

Claims

1. A method for controlling water temperature, the method being used to control N air conditioning units, characterized in that: The method for controlling water temperature includes the following steps: S01, obtain the average indoor temperature difference of the air conditioning units that are in the open state among the N air conditioning units, and obtain the average indoor temperature change rate of the air conditioning units that are in the open state; S02, determine the current temperature control cycle duration based on the average indoor temperature difference; S03, obtain the target water temperature control parameters based on the average indoor temperature difference and the average indoor temperature change rate; S04, Adjust the outdoor unit's water temperature according to the target water temperature control parameters and the current temperature control cycle duration. Step S01 includes the following steps: Get weight The weight The weights involved in the calculation of the average indoor temperature difference, wherein... It is negatively correlated with the absolute value of the rate of change of indoor temperature for each air conditioning unit; Get weight The weight The weights involved in the calculation of the average indoor temperature change rate, wherein... It is positively correlated with the absolute value of the indoor temperature difference of each air conditioning unit.

2. The method for controlling water temperature as described in claim 1, characterized in that: Steps S01 to S04 above are executed in the cyclic temperature control cycle.

3. The method for controlling water temperature as described in claim 2, characterized in that: The average indoor temperature change rate is determined based on the duration of the previous temperature control cycle.

4. The method for controlling water temperature as described in claim 2, characterized in that: The duration of the first temperature control cycle in the temperature control cycle is preset, and the first target water temperature control parameter is also preset.

5. The method for controlling water temperature as described in claim 1, characterized in that: The weight The calculation formula is as follows: , Where j represents the number of each air conditioning unit, n represents the total number of air conditioning units, and i represents the current temperature control cycle. This indicates the rate of change of indoor temperature for each air conditioning unit; and The weight The calculation formula is as follows: , Where j represents the number of each air conditioning unit, n represents the total number of air conditioning units, and i represents the current temperature control cycle. This indicates the indoor temperature difference for each air conditioning unit.

6. The method for controlling water temperature as described in claim 2, characterized in that: Step S02 includes the following steps: Determine the range in which the absolute value of the average indoor temperature difference of the N air conditioning units falls, and read the current temperature control cycle duration from the index table based on the range.

7. The method for controlling water temperature as described in claim 1, characterized in that: All N air conditioning units are either in the open state or only some of them are in the open state.

8. An air conditioning system comprising N air conditioning units, characterized in that... The air conditioning system includes: unit; There are N thermostats, and each of the N air conditioning units includes one of the N thermostats. One of the N thermostats is used to provide the indoor temperature parameter and the target indoor temperature parameter of the corresponding air conditioning unit. The controller receives the indoor temperature parameters and the target indoor temperature parameters provided by one or more of the N thermostats, obtains the average indoor temperature difference of one or more of the N air conditioning units, obtains the average indoor temperature change rate of one or more of the N air conditioning units, determines the current temperature control cycle duration based on the average indoor temperature difference, obtains the target water temperature parameter based on the average indoor temperature difference and the average indoor temperature change rate, and adjusts the unit's water temperature according to the target water temperature parameter and the current temperature control cycle duration. The controller is further configured to perform the following steps: Get weight The weight The weights involved in the calculation of the average indoor temperature difference, wherein... It is negatively correlated with the absolute value of the rate of change of indoor temperature for each air conditioning unit; Get weight The weight The weights involved in the calculation of the average indoor temperature change rate, wherein... It is positively correlated with the absolute value of the indoor temperature difference of each air conditioning unit.

9. The air conditioning system as described in claim 8, characterized in that, The controller obtains the indoor temperature difference parameters of one or more of the N rooms based on the indoor temperature parameters and the target indoor temperature parameters, and controls the water temperature of the unit based on the target water temperature parameters during the cyclic temperature control period.

10. The air conditioning system as described in claim 9, characterized in that, The controller controls the water temperature of the unit in each of the temperature control cycles of the cycle. The average indoor temperature change rate is determined based on the duration of the previous temperature control cycle.

11. The air conditioning system of claim 8, further comprising: There are N fan coil units, and each of the N air conditioning units includes one of the N fan coil units. Water pipes connect the unit and the N fan coil units, forming a water flow loop between the unit and the N fan coil units, so that each of the N fan coil units can exchange heat with a corresponding one of the N rooms.

12. The air conditioning system as described in claim 11, characterized in that: in, Each of the N fan coil units includes a fan coil solenoid valve, which is used to control the opening and closing of a corresponding section of the water pipe, and the controller controls the opening and closing of the fan coil solenoid valve.

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