EP4617579A1

EP4617579A1 - Water temperature control method, device, and storage medium

Info

Publication number: EP4617579A1
Application number: EP22964938.9A
Authority: EP
Inventors: Jinbo Li; Zhenkun XU; Jianyun HUANG; Mingliang ZHONG; Zhaobin HUANG
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2022-11-08
Filing date: 2022-11-25
Publication date: 2025-09-17
Also published as: EP4617579A4; WO2024098471A1; CN118009478A

Abstract

The present application relates to the technical field of air conditioners, and in particular to a water temperature control method, a device, and a storage medium. The water temperature control method comprises: acquiring a target temperature difference parameter of a target area adjusted by a heat exchange component, wherein the target temperature difference parameter represents a temperature difference state between an ambient temperature of an indoor ambient and a set temperature; determining a target water temperature of a water supply flow path according to the target temperature difference parameter; and on the basis of the target water temperature, controlling a heat pump unit to operate.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202211394067.9, filed on November 8, 2022 , the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present application relates to the technical field of air conditioners, and in particular to a water temperature control method, a water temperature control device and a storage medium.

BACKGROUND

In traditional technology, a set water temperature of a cold and hot water unit of a heat pump is fixed, or the set water temperature can only be simply adjusted according to an ambient temperature. When the cold and hot water unit of the heat pump is used to cool or heat multiple rooms at the same time, if the room temperature changes, the set temperature cannot be adjusted in time, resulting in a mismatch between the operating water temperature of the cold and hot water unit and the actual load, and the room temperature control is not stable and precise enough.
The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are related art.

SUMMARY

The main purpose of the present application is to provide a water temperature control method, a water temperature control device and a storage medium, aiming to solve the technical problem that the water temperature of the heat pump unit cannot be precisely and accurately controlled in the related art.
To achieve the above purpose, the present application provides a water temperature control method, applied to an environmental conditioning system, the environmental conditioning system including a heat pump unit, a water supply flow path, a water return flow path and at least one heat exchange component, the heat pump unit being connected to each heat exchange component through the water supply flow path and the water return flow path; the water temperature control method including:

obtaining a target temperature difference parameter of a target area regulated by the heat exchange component, wherein the target temperature difference parameter represents a temperature difference state between an ambient temperature and a set temperature of an indoor environment;
determining a target water temperature of the water supply flow path according to the target temperature difference parameter; and
controlling the heat pump unit to operate based on the target water temperature.

In an embodiment, the target temperature difference parameter includes a temperature difference between the ambient temperature and the set temperature and/or difference change information between the ambient temperature and the set temperature, and the determining the target water temperature according to the target temperature difference parameter includes:
determining the target water temperature according to the temperature difference and/or the difference change information.
In an embodiment, the determining the target water temperature according to the temperature difference and/or the difference change information includes:

obtaining a first target temperature of water supply of the heat pump unit;
determining a water temperature correction value according to the temperature difference and/or the difference change information; and
determining the target water temperature according to the first target temperature and the water temperature correction value.

In an embodiment, after the determining the water temperature correction value according to the temperature difference and/or the difference change information, the method further includes:

in response to that the water temperature correction value is greater than a preset water temperature correction threshold, determining the target water temperature according to the first target temperature and the water temperature correction value;
in response to that the water temperature correction value is less than the preset water temperature correction threshold, determining the target water temperature according to a current water temperature of the heat exchange component, the first target temperature, the water temperature correction value and a second target temperature of previous water supply of the heat pump unit; or
in response to that the water temperature correction value is equal to the preset water temperature correction threshold, maintaining the first target temperature as the target water temperature.

In an embodiment, the determining the target water temperature according to the current water temperature of the heat exchange component, the first target temperature, the water temperature correction value and the second target temperature of the previous water supply of the heat pump unit includes:

determining a minimum temperature among the current water temperature, the first target temperature and the second target temperature; and
determining the target water temperature according to the minimum temperature and the water temperature correction value.

In an embodiment, the obtaining the temperature difference and the difference change information includes:

obtaining an ambient temperature and a set temperature of the target area at intervals of a preset time period;
calculating a temperature difference according to the ambient temperature and the set temperature; and
obtaining a previous temperature difference, and determining difference change information according to the temperature difference and the previous temperature difference.

In an embodiment, the controlling the heat pump unit to operate based on the target water temperature includes:

determining a theoretical target water temperature range under a current operation mode of the heat pump unit;
correcting the target water temperature according to the theoretical target water temperature range; and
regulating and controlling the heat pump unit to operate based on the corrected target water temperature.

In an embodiment, after the controlling the heat pump unit to operate based on the target water temperature, the method further includes:

determining a target duration according to a current temperature difference between the ambient temperature and the set temperature of the target area, change information of a difference between the ambient temperature and the set temperature, and/or number of times for adjusting the target water temperature; and
after the target duration, obtaining the target temperature difference parameter of the target area adjusted by the heat exchange component.

In an embodiment, the determining the target duration according to a current temperature difference between the ambient temperature and the set temperature of the target area, change information of the difference between the ambient temperature and the set temperature, and/or the number of times for adjusting the target water temperature includes:

in response to that the number of times for adjusting the target water temperature is less than or equal to a preset number of times, determining the target duration according to the current temperature difference; or
in response to that the number of times for adjusting the target water temperature is greater than the preset number of times, determining the target duration according to the difference change information and a preset change coefficient.

Besides, in order to achieve the above purpose, the present application further provides a water temperature control device, including: a memory, a processor, and a water temperature control program stored in the memory and executable on the processor, wherein the water temperature control program is configured to implement the water temperature control method as described above.
Besides, in order to achieve the above purpose, the present application further provides a storage medium, a water temperature control program is stored on the storage medium, wherein when the water temperature control program is executed by a processor, the water temperature control method as described above is implemented.
The present application discloses a water temperature control method, and the water temperature control method is applied to an environmental regulation system. The environmental regulation system includes the heat pump unit, the water supply flow path, the water return flow path and at least one heat exchange component, and the heat pump unit is connected to each heat exchange component through the water supply flow path and the water return flow path. The water temperature control method includes: obtaining a target temperature difference parameter of a target area regulated by the heat exchange component, the target temperature difference parameter represents the temperature difference state between the ambient temperature and the set temperature of the indoor environment; determining a target water temperature of the water supply flow path according to the target temperature difference parameter; controlling the heat pump unit to operate based on the target water temperature. Compared with the related art, the present application uses the target temperature difference parameters of the target areas where the heat pump unit and each heat exchange component are located in the environmental regulation system, determines the target water temperature of the water supply waterway according to the target temperature difference parameters, and controls the heat pump unit to operate according to the target water temperature. The target temperature difference parameters are used to represent the temperature difference state between the ambient temperature and the set temperature of the indoor environment, and the operating state of the heat pump unit is controlled according to the temperature parameters in the actual environment, to avoid the technical problem in the related art that the water temperature of the heat pump unit cannot be precisely and accurately controlled, to improve the stability and accuracy of the temperature control of each area, and to consume less energy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a water temperature control device of the hardware operating environment according to an embodiment of the present application.
FIG. 2 is a schematic flowchart of a water temperature control method according to a first embodiment of the present application.
FIG. 3 is a structural block diagram of a heat pump unit of the water temperature control method according to an embodiment of the present application.
FIG. 4 is a structural block diagram of a water temperature control system for the water temperature control method according to an embodiment of the present application.
FIG. 5 is a schematic diagram of control logic of the water temperature control method according to an embodiment of the present application.
FIG. 6 is a schematic flowchart of the water temperature control method according to a second embodiment of the present application.

The realization of the purpose, functional features and advantages of the present application will be further described in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE EMBODIMENTS

It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
Referring to FIG. 1, FIG. 1 is a schematic structural diagram of a water temperature control device of the hardware operating environment according to an embodiment of the present application.
As shown in FIG. 1, the water temperature control device can include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004 and a memory 1005. The communication bus 1002 is used to implement connection and communication between these components. The user interface 1003 can include a display, an input unit such as a keyboard. The user interface 1003 can also include a standard wired interface and a wireless interface. The network interface 1004 can include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 can be a high-speed random access memory (RAM), or a stable non-volatile memory (NVM), such as a disk storage. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.
Those skilled in the art can understand that the structure shown in FIG. 1 does not constitute a limitation on the water temperature control device, and can include more or fewer components than shown, or combinations of certain components, or components arranged differently.
As shown in FIG. 1, the memory 1005 as a storage medium can include an operating system, a network communication module, a user interface module, and a water temperature control program.
In the water temperature control device shown in FIG. 1, the network interface 1004 is mainly used for data communication with the network server, and the user interface 1003 is mainly used for data interaction with the user. The processor 1001 and the memory 1005 in the water temperature control device according to the present application can be provided in the water temperature control device. The water temperature control device calls the water temperature control program stored in the memory 1005 through the processor 1001, and performs the water temperature control method in the embodiment of the present application.
The embodiment of the present application provides a water temperature control method. Referring to FIG. 2, FIG. 2 is a flow chart of a water temperature control method according to a first embodiment of the present application.
The water temperature control method includes the following steps.
Step S10, obtaining a target temperature difference parameter of a target area adjusted by a heat exchange component, the target temperature difference parameter represents the temperature difference state between the ambient temperature and the set temperature of the indoor environment.
It should be noted that the executor of the method of the present application may be a device with data acquisition or data processing functions, such as a control device for a heat pump unit, or other devices that can achieve the same or similar functions, such as an external control computer or computer, etc, which is not limited in the present application. In the present application, the control device for the heat pump unit is used as an example for description.
The heat pump unit is a water chiller/heater unit with heat pump. In the present application, the heat pump unit is used for explanation. The heat pump unit includes: a compressor 1, a water-side heat exchanger 2, a four-way reversing valve 3, a throttling component 4, and a heat source side heat exchanger 5. The compressor 1 is configured to control the refrigerant temperature inside the pipeline of the heat pump unit, control the temperature of each heat exchanger, and exchange heat with the outside to achieve heating or cooling. The water-side heat exchanger 2 is configured to exchange heat with the water in the external water tank to control the external water temperature. The four-way reversing valve 3 is configured to adjust the flow direction of the refrigerant in the heat pump unit. According to the different operation modes of the heat pump unit, the valve position of the four-way reversing valve 3 is different from a communication port. The throttling component 4 is configured to control the flow rate of the refrigerant in the heat pump unit to control the speed of heat exchange with the external device. The larger the opening of the throttling component 4, the faster the heat exchange, and the smaller the opening, the slower the heat exchange. This is also used to release the pressure of the refrigerant to facilitate the transformation of the refrigerant form. The heat source side heat exchanger 5 can be used as an evaporator or condenser in different modes, which is not limited in the present application.
In an embodiment, referring to FIG. 3, FIG. 3 is a structural block diagram of the heat pump unit according to the present application. An output end of the compressor 1 is connected to a first communication port D of the four-way reversing valve 3, a second communication port C of the four-way reversing valve 3 is connected to a first end of the water side heat exchanger 2, a third communication port S of the four-way reversing valve 3 is connected to a second end of the compressor 1, and the fourth communication port E of the four-way reversing valve 3 is connected to the first end of the heat source side heat exchanger 5. The second communication port of the water side heat exchanger 2 is connected to the second end of the throttling component 4, and the second end of the heat source side heat exchanger 5 is connected to the first end of the throttling component 4.
When the heat pump unit operates in the heating mode, referring to the solid line refrigerant flow direction in FIG. 3, the compressor 1 runs to compress the refrigerant to obtain high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is transmitted to the water-side heat exchanger through the four-way reversing valve 3 under the action of pressure. At this time, the water-side heat exchanger 2 serves as a condenser. After heat exchange with the water in the water-side heat exchanger 2, the inlet water temperature is lower than the outlet water temperature, to increase the external water temperature. After passing through the water-side heat exchanger 2, the refrigerant flows through the throttling component 4 in a high-pressure and medium-temperature state. A low-pressure and medium-temperature refrigerant obtained after passing through the throttling component 4 flows through the heat source side heat exchanger 5. At this time, the heat source side heat exchanger 5 serves as an evaporator to obtain a low-temperature and low-pressure refrigerant. Finally, the low-temperature and low-pressure refrigerant flows back to the compressor 1 through the four-way reversing valve 3 to complete the heating process. During the heating, the first communication port D and the second communication port C of the four-way reversing valve 3 are connected to transport the refrigerant to the water side heat exchanger 2 for condensation, and the third communication port S and the fourth communication port E of the four-way reversing valve 3 are connected to recover the refrigerant to the compressor 1 to facilitate the next refrigerant compression.
When the heat pump unit operates in the cooling mode, referring to the dotted refrigerant flow direction in FIG. 3, the compressor 1 operates to compress the internal refrigerant into a high-temperature and high-pressure refrigerant, and transport the high-temperature and high-pressure refrigerant to the heat source side heat exchanger 5 through the four-way reversing valve 3. At this time, the heat source side heat exchanger 5 serves as a condenser to condense the refrigerant to obtain a medium-temperature and high-pressure refrigerant, which is then depressurized through the throttling component 4 to obtain a low-pressure and medium-temperature refrigerant. The refrigerant then flows through the water side heat exchanger 2 for heat exchange. At this time, the water side heat exchanger 2 serves as an evaporator to absorb the heat of the water, to realize water cooling. Finally, the refrigerant flows back to the compressor 1 through the four-way reversing valve 3 to complete the refrigeration process. During the refrigeration, the first communication port D and the fourth communication port E of the four-way reversing valve 3 are connected to transport the refrigerant to the heat source side heat exchanger 5 for condensation, and the second communication port C and the third communication port S of the four-way reversing valve 3 are connected to recover the refrigerant to the compressor 1 to facilitate the next refrigerant compression.
It can be understood that in traditional technology, taking the cooling mode as an example, the heat pump unit can continue to run the cooling operation so that the water temperature of the water-side heat exchanger drops to a certain temperature. When the water temperature in the water-side heat exchanger drops to the temperature set by the user, the heat pump unit will shut down to avoid further lowering the temperature and deviating from the user's usage needs. At this time, the water in the water-side heat exchanger flows through each room through the pipes to exchange heat with the outside, and then flows back to the water tank, which will cause the water temperature at the water-side heat exchanger to rise. After detecting that the water temperature at the water-side heat exchanger has risen, the heat pump unit will restart.
It is worth noting that the heat pump unit is provided in an environmental conditioning system, which includes a heat pump unit, a water supply flow path, a water return flow path and at least one heat exchange component. The heat pump unit is connected to each heat exchange component through the water supply flow path and the water return flow path. The heat exchange component corresponds to the installation area, that is, the heat exchange components installed in the same area can be regarded as the same heat exchange component. The heat pump unit includes: various types of water chiller/heater units with heat pump, such as air source heat pump units, air-cooled heat pump units, ground source heat pump units, etc., which is not limited in the present application.
The room communicated to the heat pump cold and hot water unit is used as an example for explanation. The heat exchange components in each room can be floor heating coils, radiation panels, fan discs or heat sinks, etc., or other equipment that can achieve heat exchange with the heat pump cold and hot water unit, which is not limited in the present application.
In the specific implementation, the heat pump unit controls the temperature of the water on the outlet side through the water side heat exchanger, and outputs the water on the outlet side to each room for heat exchange through the water supply flow path. Then, the water flows back to the heat pump unit through the water return flow path connected to each room to facilitate the next heat exchange.
It should be understood that the heat exchange component is installed at a target area, or multiple heat exchange components are installed in the same target area. The target area can be an area where water temperature control is required. Different choices can be made depending on the area connected to the heat pump unit. Take multiple rooms connected to the heat pump unit as an example for explanation. Referring to FIG. 4, FIG. 4 is a structural block diagram of the water temperature control system according to the present application.
It can be understood that the target temperature difference parameter represents the temperature difference state between the ambient temperature of the indoor environment and the set temperature. The temperature difference state includes: temperature difference and/or difference change information. The temperature difference refers to the difference between the room air temperature and the user-set temperature in the room. The difference change information refers to the change value between the temperature difference and the temperature difference at the previous temperature correction, and the change value can be the difference.
In addition, if the heat pump unit supplies hot and cold water to multiple rooms at the same time to control the temperatures of multiple rooms, since the water temperatures in the water supply flow pipe and the water return flow pipe are the same, to meet the requirements of set temperatures in different rooms, the setting of the outlet water temperature of the water-side heat exchanger in the heat pump unit can be determined according to the user-set temperature of each room and the operating mode of the heat pump unit. When the heat pump unit operates in heating mode, a maximum value of the outlet water temperature of the water-side heat exchanger in the heat pump unit can be the maximum value of the set temperatures of each room. When the heat pump unit operates in cooling mode, a minimum value of the water outlet temperature of the water-side heat exchanger in the heat pump unit can be the minimum value of the set temperatures of each room.
Furthermore, to obtain the temperature difference and difference change information of the target area, the steps for obtaining the temperature difference and difference change information of the target area can be specifically as follows: at a preset time period interval, obtaining the ambient temperature and the set temperature of the target area, calculating the temperature difference based on the ambient temperature and the set temperature, obtaining the previous temperature difference, and determining the difference change information based on the temperature difference and the previous temperature difference.
If there are multiple water temperature adjustments, the preset time period can be determined based on the previous temperature difference. If it is the first water temperature adjustment, the preset time period can be 120s, which is not limited in the present application.
In addition, the preset time period can be determined based on the temperature difference-period association table. The temperature difference-period association table can refer to Table 1. Table 1

E_TA E_TA<x x≤E_TA<y E_TA≥y

TWM (second) S1 S2 S3
E_TA refers to the difference between the room air temperature and the set temperature, x, y, S1, S2 and S3 are determined according to experiments, and x=1, y=3, S1=120, S2=90 and S3=60 can be selected. Cooling and heating can take different values respectively, which is not limited in the present application.
Step S20, determining the target water temperature of the water supply flow path according to the target temperature difference parameter.
It should be noted that the target temperature difference parameter includes the temperature difference between the ambient temperature and the set temperature, and the difference change information between the ambient temperature and the set temperature, that is, when the target water temperature of the water supply flow path is determined according to the target temperature difference parameter, the target water temperature can be determined according to the temperature difference and/or the difference change information.
Furthermore, to achieve precise water temperature control when determining the target water temperature of the water supply flow path, the determining the target water temperature according to the temperature difference and/or the difference change information includes:

obtaining the current first target temperature of the water supply of the heat pump unit;
determining the water temperature correction value according to the temperature difference and/or the difference change information; and
determining the target water temperature according to the first target temperature and the water temperature correction value.

It should be understood that the first target temperature refers to the corresponding total water supply target temperature in the operating mode of the heat pump unit. For example, when hot water is supplied to heat exchange components in multiple rooms at the same time, the first target temperature in the heating mode can be the maximum value among the target temperatures set for each room, which serves as the first target temperature in the heating mode of the heat pump unit. At the same time, when cold water is supplied to heat exchange components in multiple rooms at the same time, the first target temperature in the cooling mode can be the minimum value among the target temperatures set for each room, which serves as the first target temperature in the cooling mode of the heat pump unit.
The water temperature correction value is used as a reference correction water temperature for controlling the water temperature of the heat pump unit according to the temperature difference between the ambient temperature of the indoor environment and the set temperature. To more accurately control the operating water temperature of the heat pump unit, the present application can respectively determine the target intervals of the temperature difference and the difference change information, and then query the accurate water temperature correction value through the target intervals corresponding to the temperature difference and the difference change information.
The target interval refers to a numerical interval determined by a correlation table corresponding to the water temperature correction value and the temperature difference/difference change information, and the water temperature correction value corresponding to the target interval is obtained by querying the correlation table.

In an embodiment, the correlation table is shown in Table 2:

Δ TWsb_n		heat up		ΔE_TAh_n		cool down
Δ TWsb_n		≥+1.0	0.5	0	≤-0.5	≤-1.0
hot	≥3	-5	-5	-5	-4	-2
E_TA_n= T1_Rn-Ts_Rn	1.5	-3	-3	-3	0	0.5
	0	-1.5	-0.5	0	1	2
	-1.5	1	3	3	3	4
cool	≤-3	3	4	5	5	5

Δ TW sb_n is the target water temperature adjustment amount, ΔE_TAh_n is the actual air temperature change value of room n, and E_TA_n is the difference between the actual air temperature of room n and the set temperature.
It is worth noting that the set temperature of each target area is determined according to the water temperature correction value, and different target water temperature setting strategies are used according to the size of the water temperature correction value. For example: when the water temperature correction value is greater than 0, it means that the target water temperature of the room needs to be increased. At this time, the water temperature correction value can be added to the total water supply target water temperature of the heat pump unit, and the result of the addition is used as the set water temperature of the room to achieve the purpose of increasing the set water temperature of the target room.
Furthermore, after the determining the water temperature correction value according to the temperature difference and/or the difference change information, the method further includes:

when the water temperature correction value is greater than the preset water temperature correction threshold, determining the target water temperature according to the first target temperature and the water temperature correction value;
when the water temperature correction value is less than the preset water temperature correction threshold, determining the target water temperature according to the current water temperature of the heat exchange component, the first target temperature, the water temperature correction value, and the second target temperature of the previous water supply of the heat pump unit;
when the water temperature correction value is equal to the preset water temperature correction threshold, maintaining the first target temperature as the target water temperature.

It can be understood that the second target temperature of the previous water supply of the heat pump unit refers to the target water supply temperature obtained when the water temperature of the heat pump unit was controlled last time.
In an embodiment, by comparing the water temperature correction value with the preset water temperature correction threshold, the water temperature adjustment strategy for the target area can be determined according to the magnitude relationship between the water temperature correction value and the preset water temperature correction threshold. The preset water temperature correction threshold can be 0 to determine whether the water temperature needs to be increased or decreased according to the water temperature correction value.
In an embodiment, when the water temperature correction value is greater than 0, it indicates that the target water temperature of the room needs to be increased. At this time, the water temperature correction value can be added to the total water supply target water temperature of the heat pump unit, and the result of the addition is used as the set water temperature of the room. When the water temperature correction value is equal to 0, it indicates that the water temperature of the room is just right and does not need to be increased or decreased. The set water temperature of the room can be maintained to keep the current state unchanged.
In addition, when the water temperature correction value is less than 0, it means that the target water temperature of the room needs to be lowered. To lower the water temperature without affecting the normal use of the user, when lowering the water temperature, the actual water temperature of the target room, the current set temperature and the set water temperature obtained by the last water temperature control can also be referred to, and a comprehensive comparison can be made to select a water temperature adjustment scheme with less impact. For example: when the water temperature correction value Δ TWsb is less than 0, the target water temperature TWsb is equal to a sum of Δ TWsb and min(TWsr, TWso, TWsb(n-1)), where TWsr is the actual water temperature, TWso is the current target water temperature, and TWsb(n-1) is the target water temperature obtained by the last control algorithm. By selecting the minimum water temperature among the current water temperature, the current target water temperature and the previous target water temperature, and combining the water temperature correction value to achieve the setting of the target water temperature, the impact on the user when adjusting the water temperature is small.
Finally, when the water temperature correction value is equal to 0, it means that the temperature of the target area is in the best state at this time, and the user experience can be guaranteed by maintaining the total water supply target water temperature as the target water temperature.
Step S30, controlling the heat pump unit to operate based on the target water temperature.
It can be understood that after determining the target water temperature of each room, the temperature is adjusted to the target water temperature according to the target water temperature adjustment speed ξ TWS preset by the control module. The total water supply temperature in the current operating mode may also change. At this time, the operating frequency of the compressor in the heat pump unit can be adjusted to adjust the water temperature at the outlet water side of the water temperature heat exchanger, to achieve the purpose of adjusting the total water supply temperature.
In an embodiment, referring to FIG. 5, FIG. 5 is a control logic block diagram of the present application, where T1_Rn is the air temperature of room n, T1s_Rn is the set temperature of room n, TWsb is the target water temperature, TWsb(n-1) is the water temperature obtained by the previous control algorithm, TWso is the current target water temperature, TWsr is the current actual water temperature, E_TA_n is the difference between the actual air temperature of room n and the set temperature, △E_TAh_n is the change value of the actual air temperature of room n, △E_TA_n is the change value of the difference between the actual air temperature of room n and the set temperature, TWsb_n is the target water temperature of room n, TWM is the adjustment period, Δ TWsb is the target water temperature adjustment amount, and ξ TWS is the target water temperature adjustment speed.
Further, the controlling the operation of the heat pump unit based on the target water temperature includes:

determining the theoretical target water temperature range under the current operation mode of the heat pump unit;
correcting the target water temperature according to the theoretical target water temperature range; and
controlling the operation of the heat pump unit based on the corrected target water temperature.

It should be noted that the theoretical target water temperature range refers to the water temperature value range of the compressor in this operation mode, for example: the water temperature cannot be higher than 100°C, nor lower than 0°C, and the heat pump unit has different theoretical operation frequency ranges under different operation modes.
In actual implementation, the water temperature will not be approached to the water temperature extreme value. Generally, different theoretical water temperature ranges can be set according to different operating modes of the heat pump unit.
In an embodiment, when the heat pump unit operates in the cooling mode, if the adjusted target water temperature is not within the theoretical target water temperature range in the cooling mode, the adjusted target water temperature can be adjusted according to the interval relationship between the adjusted target water temperature and the theoretical target water temperature range in the cooling mode. For example, the theoretical target water temperature range in the cooling mode is TWminC-TWmaxC. If the adjusted target water temperature is less than TWminC, the adjusted target water temperature is corrected to TWminC. If the adjusted target water temperature is greater than TWmaxC, the adjusted target water temperature is corrected to TWmaxC.
Similarly, in an embodiment, when the heat pump unit operates in the heating mode, if the adjusted target water temperature is not within the theoretical target water temperature range in the heating mode, the adjusted target water temperature can be adjusted according to the interval relationship between the adjusted target water temperature and the theoretical target water temperature range in the heating mode. For example: the theoretical target water temperature range in the heating mode is TWminH-TWmaxH. If the adjusted target water temperature is less than TWminH, the adjusted target water temperature is corrected to TWminH; if the adjusted target water temperature is greater than TWmaxH, the adjusted target water temperature is corrected to TWmaxH.
The present application uses the target temperature difference parameters of the target areas where the heat pump unit and each heat exchange component are located in the environmental regulation system, determines the target water temperature of the water supply waterway according to the target temperature difference parameters, and then controls the operation of the heat pump unit according to the target water temperature. The target temperature difference parameters are used to characterize the temperature difference state between the ambient temperature and the set temperature of the indoor environment, and the operating state of the heat pump unit is controlled according to the temperature parameters in the actual environment, to avoid the technical problem in the related art that the water temperature of the heat pump unit cannot be precisely and accurately controlled, to improve the stability and accuracy of temperature control in each area, and to consume less energy.
Referring to FIG. 6, FIG. 6 is a flow chart of the water temperature control method according to a second embodiment of the present application.
Based on the above first embodiment, the water temperature control method further includes:
step S50, determining the target duration according to the current temperature difference between the ambient temperature and the set temperature of the target area, the change information of the difference between the ambient temperature and the set temperature, and/or the number of times for adjusting the target water temperature.
It should be noted that when the heat pump unit heats or cools each room, the temperature in the room will not always be maintained at a stable state due to the operating power, operating time and monitoring interval of the heat pump unit. For example, if the temperature is high at this time, the heat pump system adjusts the water temperature to lower the temperature of the room. After a period of time, the temperature of the room may drop to a state that does not meet the user's needs, and the water temperature needs to be readjusted. Therefore, the number of water temperature adjustments can be updated every time the water temperature is effectively adjusted, and the target duration refers to the time interval for obtaining the temperature difference between the ambient temperature of the indoor environment and the set temperature.
It can be understood that if the heat pump unit adjusts the water supply temperature of the heat pump unit multiple times, it means that the temperature difference changes greatly at this time, and it is necessary to shorten the time interval for monitoring the indoor temperature difference and increase the monitoring frequency. The preset number of adjustments is used to determine whether it is necessary to shorten the time interval for adjacent acquisitions of temperature information. The preset number of adjustments can be set by the user, for example: 4 or 5, etc., which is not limited in the present application.
It should be noted that when adjusting the target water temperature, if the water temperature adjustment range is not large, it means that the temperature in the room is normally dissipated, and the heat pump unit is operating normally. The preset time period can be maintained without adjusting the preset time period. However, if the water temperature adjusted each time is greater than the set temperature difference threshold, it means that the temperature dissipation process in the room is abnormal, and the temperature acquisition cycle needs to be shortened to facilitate more precise control of the indoor temperature and improve user experience.
In an embodiment, the preset time period can be determined based on a temperature difference-period association table, and the temperature difference-period association table can refer to Table 3. Table 3

E_TA E_TA<x x≤E_TA<y E_TA≥y

TWM(second) S1 S2 S3
E_TA refers to the difference between the room air temperature and the set temperature, x, y, S1, S2 and S3 are determined based on experimental values, and x=1, y=3, S1=120, S2=90, S3=60 can be selected. Cooling and heating can take different values respectively, and is not limited in the present application.
Step S60, after a target duration interval, obtaining the target temperature difference parameter of the target area adjusted by the heat exchange component.
In an embodiment, the temperature difference between the ambient temperature of the indoor environment and the set temperature is obtained for the first time, and effective water temperature control of the heat pump unit is performed for 120 seconds. The temperature difference between the ambient temperature of the indoor environment and the set temperature is obtained for the second time, and effective water temperature control of the heat pump unit is performed. After 90 seconds, the temperature difference between the ambient temperature of the indoor environment and the set temperature is obtained for the third time, and effective water temperature control of the heat pump unit is performed. Until the start of the fourth TWM cycle, the target duration is determined according to the difference change information and the preset change coefficient. That is, when |△E_TW| is greater than or equal to 1, TWM decreases according to the coefficient d, and the value range of d is 0~1, for example: 0.5. △E_TW refers to the difference change information, that is, the change value of the current temperature difference between the ambient temperature and the set temperature and the temperature difference at the previous temperature correction, and the change value can be the difference, which is not limited in the present application.
The present application determines whether the adjustment cycle needs to be shortened through the number of temperature adjustments and the temperature difference after adjustment, to provide more precise temperature control and improve the user experience.
In addition, the embodiment of the present application also proposes a storage medium, on which a water temperature control program is stored, and when the water temperature control program is executed by the processor, the water temperature control method described above is implemented.
Since the storage medium adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.
It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present application. In specific applications, those skilled in the art can make settings as needed, which is not limited in the present application.
It should be noted that the workflow described above is only illustrative and does not limit the scope of the present application. In practical applications, those skilled in the art can select part or all of them according to actual needs to achieve the purpose of the solution of the present application, which is not limited here.
In addition, for technical details not described in detail in the present application, please refer to the water temperature control method provided in any embodiment of the present application, which will not be repeated here.
In addition, it should be noted that in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the existence of other identical elements in the process, method, article or system including the element.
The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.
Through the description of the above implementation methods, those skilled in the art can clearly understand that the above implementation methods can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases the former is better. Based on this understanding, the technical solution of the present application can essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM)/RAM, a disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application.
The above are only some embodiments of the present application, and are not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are also included in the scope of the present application.

Claims

A water temperature control method, applied to an environmental conditioning system, the environmental conditioning system comprising a heat pump unit, a water supply flow path, a water return flow path and at least one heat exchange component, the heat pump unit connected to each heat exchange component through the water supply flow path and the water return flow path,
the water temperature control method comprising:
obtaining a target temperature difference parameter of a target area regulated by the heat exchange component, wherein the target temperature difference parameter represents a temperature difference state between an ambient temperature and a set temperature of an indoor environment;

determining a target water temperature of the water supply flow path according to the target temperature difference parameter; and

controlling the heat pump unit to operate based on the target water temperature.
The water temperature control method according to claim 1, wherein the target temperature difference parameter comprises a temperature difference between the ambient temperature and the set temperature and/or difference change information between the ambient temperature and the set temperature, and said determining the target water temperature according to the target temperature difference parameter comprises:
determining the target water temperature according to the temperature difference and/or the difference change information.
The water temperature control method according to claim 2, wherein said determining the target water temperature according to the temperature difference and/or the difference change information comprises:
obtaining a first target temperature of water supply of the heat pump unit;

determining a water temperature correction value according to the temperature difference and/or the difference change information; and

determining the target water temperature according to the first target temperature and the water temperature correction value.
The water temperature control method according to claim 3, wherein after determining the water temperature correction value according to the temperature difference and/or the difference change information, the method further comprises:
in response to that the water temperature correction value is greater than a preset water temperature correction threshold, determining the target water temperature according to the first target temperature and the water temperature correction value;

in response to that the water temperature correction value is less than the preset water temperature correction threshold, determining the target water temperature according to a current water temperature of the heat exchange component, the first target temperature, the water temperature correction value, and a second target temperature of previous water supply of the heat pump unit; or

in response to that the water temperature correction value is equal to the preset water temperature correction threshold, maintaining the first target temperature as the target water temperature.
The water temperature control method according to claim 4, wherein said determining the target water temperature according to the current water temperature of the heat exchange component, the first target temperature, the water temperature correction value, and the second target temperature of the previous water supply of the heat pump unit comprises:
determining a minimum temperature among the current water temperature, the first target temperature, and the second target temperature; and

determining the target water temperature according to the minimum temperature and the water temperature correction value.
The water temperature control method according to claim 2, wherein said obtaining the temperature difference and the difference change information comprises:
obtaining an ambient temperature and a set temperature of the target area at intervals of a preset time period;

calculating a temperature difference according to the ambient temperature and the set temperature; and

obtaining a previous temperature difference, and determining the difference change information according to the temperature difference and the previous temperature difference.
The water temperature control method according to claim 1, wherein said controlling the heat pump unit to operate based on the target water temperature comprises:
determining a theoretical target water temperature range under a current operation mode of the heat pump unit;

correcting the target water temperature according to the theoretical target water temperature range; and

regulating and controlling the heat pump unit to operate based on the corrected target water temperature.
The water temperature control method according to any one of claims 1 to 7, wherein after controlling the heat pump unit to operate based on the target water temperature, the method further comprises:
determining a target duration according to a current temperature difference between the ambient temperature and the set temperature of the target area, change information of a difference between the ambient temperature and the set temperature, and/or number of times for adjusting the target water temperature; and

after the target duration, returning to the step of obtaining the target temperature difference parameter of the target area adjusted by the heat exchange component.
The water temperature control method according to claim 8, wherein said determining the target duration according to a current temperature difference between the ambient temperature and the set temperature of the target area, change information of the difference between the ambient temperature and the set temperature, and/or the number of times for adjusting the target water temperature comprises:
in response to that the number of times for adjusting the target water temperature is less than or equal to a preset number of times, determining the target duration according to the current temperature difference; or

in response to that the number of times for adjusting the target water temperature is greater than the preset number of times, determining the target duration according to the difference change information and a preset change coefficient.
A water temperature control device, comprising: a memory, a processor, and a water temperature control program stored in the memory and executable on the processor, wherein the water temperature control program is configured to implement the water temperature control method according to any one of claims 1 to 9.
A storage medium, wherein a water temperature control program is stored on the storage medium, and when the water temperature control program is executed by a processor, the water temperature control method according to any one of claims 1 to 9 is implemented.