WO2023087700A1

WO2023087700A1 - Multi-connected system and control method thereof

Info

Publication number: WO2023087700A1
Application number: PCT/CN2022/099951
Authority: WO
Inventors: 贾庆磊; 梁爱云; 宋振兴; 卢宪晓
Original assignee: 青岛海信日立空调系统有限公司
Priority date: 2021-11-17
Filing date: 2022-06-20
Publication date: 2023-05-25
Also published as: CN117413151A

Abstract

A multi-connected system (1000) and a control method thereof. The multi-connected system (1000) comprises a water source device (10), a heat pump unit (30), a water tank (20), and a controller (40). The heat pump unit (30) supplements heat for the water source device (10) by means of the water tank (20). The controller (40) is configured to: when the water source device (10) operates, if a water inlet temperature (Te) at the first water inlet (A1) is less than a first preset temperature, control the heat pump unit (30) to be turned on; and if the water inlet temperature (Te) at the first water inlet (A1) is greater than a second preset temperature, control the heat pump unit (30) to be turned off, the first preset temperature being less than or equal to the second preset temperature. Therefore, a heat supplementing effect of the water source device can be improved, and energy consumption is reduced.

Description

Multi-connected system and its control method

This application claims priority to Chinese patent application number 202111362911.5 filed on November 17, 2021; priority to Chinese patent application number 202111386122.5 filed on November 22, 2021; November 2021 The priority of the Chinese patent application with application number 202111442175.4 filed on the 30th, the entire content of which is incorporated in this application by reference.

technical field

The present disclosure relates to the technical field of heat exchange, in particular to a multi-line system and a control method thereof.

Background technique

Multi-line systems usually include air source multi-line systems and water source multi-line systems. The multi-connected water source system has gradually been favored by people because of its high energy efficiency ratio, small footprint, low operating noise and low vibration. The multi-connected water source system usually needs supplementary heat in winter applications, and the heat pump hot water system is gradually applied to the multi-connected water source system due to its stable heat supplement effect.

Contents of the invention

On the one hand, some embodiments of the present disclosure provide a multi-connection system. The multi-connected system includes a water source machine, a heat pump unit, a water tank and a controller. The water source machine includes a first heat exchanger, and the first heat exchanger includes a first water inlet and a first water outlet. The heat pump unit includes a second heat exchanger, and the second heat exchanger includes a second water inlet and a second water outlet. The water tank includes a first water supply port, a first water return port, a second water supply port and a second water return port. The first water supply port communicates with the first water inlet, and the first water return port communicates with the first water outlet. The second water supply port communicates with the second water inlet, and the second water return port communicates with the second water outlet. The heat pump unit supplements heat for the water source machine through the water tank. The controller is configured to: when the water source machine is running, if the water inlet temperature at the first water inlet is lower than a first preset temperature, control the heat pump unit to start; if the first water inlet If the inlet water temperature is greater than the second preset temperature, the heat pump unit is controlled to be turned off. The first preset temperature is less than or equal to the second preset temperature.

On the other hand, some embodiments of the present disclosure provide a method for controlling a multi-connected system. The multi-connected system includes a water source machine, a heat pump unit, a water tank and a controller. The heat pump unit supplements heat for the water source machine through the water tank. The method includes: when the water source machine is running, if the temperature of the first water inlet of the water source machine is lower than a first preset temperature, the controller controls the heat pump unit to start; When the temperature of a water inlet is greater than the second preset temperature, the controller controls the heat pump unit to be turned off. The first preset temperature is less than or equal to the second preset temperature. The first water inlet of the water source machine is the water inlet between the water source machine and the water tank.

Description of drawings

FIG. 1 is a schematic diagram of a multi-connection system according to some embodiments;

Fig. 2 is a schematic diagram of a water source machine in a multi-line system according to some embodiments;

3 is a schematic diagram of a heat pump unit in a multi-connected system according to some embodiments;

4 is a schematic diagram of a heat pump unit and a water tank in a multi-connected system according to some embodiments;

Figure 5 is a flowchart of a multi-connection system according to some embodiments;

FIG. 6 is another flowchart of a multi-connection system according to some embodiments;

Fig. 7 is a flow chart of a heat pump hot water system according to some embodiments;

FIG. 8 is another flowchart of a heat pump water heating system according to some embodiments;

Fig. 9 is another flowchart of a heat pump hot water system according to some embodiments;

Fig. 10 is another flowchart of a heat pump water heating system according to some embodiments;

Fig. 11 is another flowchart of a heat pump hot water system according to some embodiments;

Fig. 12 is a flow chart of calculating the heat dissipation of the water tank for each replenishment strategy according to some embodiments;

13 is a graph of energy efficiency of a heat pump unit at different operating frequencies according to some embodiments;

Figure 14 is a flow diagram of a heat pump assembly according to some embodiments;

Figure 15 is another flow diagram of a heat pump assembly according to some embodiments;

Figure 16 is yet another flow diagram of a heat pump unit according to some embodiments;

Fig. 17 is a flowchart of a control method of a multi-connection system according to some embodiments;

Fig. 18 is a flow chart of another method for controlling a multi-connected system according to some embodiments;

Fig. 19 is a flow chart of another method for controlling a multi-connected system according to some embodiments;

Fig. 20 is a flow chart of another method for controlling a multi-connected system according to some embodiments;

Fig. 21 is a flow chart of another method for controlling a multi-connection system according to some embodiments.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments provided in the present disclosure belong to the protection scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the term "comprise" and other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as the meaning of openness and inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" example)" or "some examples (some examples)" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or examples are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

When describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited by the context herein.

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and both include the following combinations of A, B and C: A only, B only, C only, A and B A combination of A and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and a combination of A and B.

As used herein, the term "if" is optionally interpreted to mean "when" or "at" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that ..." or "if [the stated condition or event] is detected" are optionally construed to mean "when determining ..." or "in response to determining ..." depending on the context Or "upon detection of [stated condition or event]" or "in response to detection of [stated condition or event]".

The use of "suitable for" or "configured to" herein means open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

As used herein, "about", "approximately" or "approximately" includes the stated value as well as the average within the acceptable deviation range of the specified value, wherein the acceptable deviation range is as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of a particular quantity (ie, limitations of the measurement system).

As used herein, "parallel", "perpendicular", and "equal" include the stated situation and the situation similar to the stated situation, the range of the similar situation is within the acceptable deviation range, wherein the The stated range of acceptable deviation is as determined by one of ordinary skill in the art taking into account the measurement in question and errors associated with measurement of the particular quantity (ie, limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; Deviation within 5°. "Equal" includes absolute equality and approximate equality, where the difference between the two that may be equal is less than or equal to 5% of either within acceptable tolerances for approximate equality, for example.

(1) Implementation methods associated with multi-line systems

Fig. 1 is a schematic diagram of a multi-connection system according to some embodiments.

Some embodiments of the present disclosure provide a multi-connection system. As shown in FIG. 1 , the multi-split system 1000 includes a water source machine 10 , a heat pump unit 30 , a water tank 20 and a controller 40 . The water tank 20 communicates with the water source machine 10 and the heat pump unit 30 respectively. The heat pump unit 30 can be used in conjunction with the water tank 20 to provide a stable supplementary water source for the water source machine 10 and ensure the stable operation of the water source machine 10 .

In some embodiments, as shown in FIG. 2 , the water source unit 10 includes an outdoor unit 102 and an indoor unit 103 . The outdoor unit 102 and the indoor unit 103 are connected through pipelines to transmit refrigerant.

The indoor unit 103 includes a fourth heat exchanger 1031 .

Fig. 2 is a schematic diagram of a water source machine in a multi-connection system according to some embodiments.

As shown in FIG. 2 , the outdoor unit 102 includes a second compressor 1021 , a second four-way valve 1022 , an expansion valve 1023 , and a first heat exchanger 101 .

The second compressor 1021, the first heat exchanger 101, the expansion valve 1023 and the fourth heat exchanger 1031 form a refrigerant circuit, and the refrigerant circulates in the refrigerant circuit for heat exchange, thereby realizing the cooling mode and the cooling mode of the water source machine 10. heating mode.

The second compressor 1021 is configured to compress the refrigerant such that the low-pressure refrigerant is compressed to form the high-pressure refrigerant.

The second four-way valve 1022 is connected in the refrigerant circuit to switch the flow direction of the refrigerant in the refrigerant circuit so that the water source machine 10 executes a cooling mode or a heating mode.

The expansion valve 1023 is connected between the first heat exchanger 101 and the fourth heat exchanger 1031, and the pressure of the refrigerant flowing through the first heat exchanger 101 and the fourth heat exchanger 1031 is adjusted by the opening of the expansion valve 1023, so as to The flow rate of refrigerant flowing between the first heat exchanger 101 and the fourth heat exchanger 1031 is adjusted.

As shown in FIG. 2 , the first heat exchanger 101 includes four ports, namely a first water inlet A1 , a first water outlet A2 , a first refrigerant interface A3 and a first indoor unit interface A4 . Water enters the first heat exchanger 101 through the first water inlet A1 and flows out of the first heat exchanger 101 through the first water outlet A2. The refrigerant flows through the first heat exchanger 101 through the first refrigerant interface A3 and the first indoor unit interface A4, and releases heat when passing through the first heat exchanger 101 . The heat can be absorbed by the water flowing through the first heat exchanger 101 , so as to realize the heat exchange between the refrigerant and the water.

When the water source machine 10 operates in cooling mode, the first heat exchanger 101 acts as a condenser, and the fourth heat exchanger 1031 acts as an evaporator. The second compressor 1021 works so that the refrigerant in the fourth heat exchanger 1031 is in an ultra-low pressure state. The liquid refrigerant in the fourth heat exchanger 1031 quickly evaporates and absorbs heat to cool the surrounding environment. After being pressurized by the second compressor 1021 , the gaseous refrigerant condenses into a liquid state in the high-pressure environment in the first heat exchanger 101 , and releases heat to the water flowing through the first heat exchanger 101 .

When the water source machine 10 operates in the heating mode, the first heat exchanger 101 acts as an evaporator, and the fourth heat exchanger 1031 acts as a condenser. The gaseous refrigerant is pressurized by the second compressor 1021 to become a high-temperature and high-pressure gas, and enters the fourth heat exchanger 1031 for condensation. During the condensation process, the refrigerant changes from a gaseous state to a liquid state to release heat, thereby heating the surrounding environment. The liquid refrigerant enters the first heat exchanger 101 for evaporation after being decompressed by the expansion valve 1023 . During the evaporation process, the refrigerant changes from a liquid state to a gas state, and absorbs heat from water flowing through the first heat exchanger 101 .

Fig. 3 is a schematic diagram of a heat pump unit in a multi-connected system according to some embodiments.

In some embodiments, as shown in FIG. 3 , the heat pump unit 30 includes a second heat exchanger 301 .

The second heat exchanger 301 includes a second water inlet B1, a second water outlet B2, a second refrigerant interface B3 and a second indoor unit interface B4.

In some embodiments, the second heat exchanger 301 and the first heat exchanger 101 may be plate heat exchangers, casing heat exchangers, shell and tube heat exchangers, and the like.

In some embodiments, as shown in FIG. 3 , the heat pump unit 30 further includes a first compressor 302 , a first throttling element 309 and a third heat exchanger 305 . The first compressor 302, the second heat exchanger 301, the first throttling element 309 and the third heat exchanger 305 are sequentially connected to form a refrigerant circuit, and the refrigerant circulates in the refrigerant circuit and passes through the second heat exchanger 301 and the third heat exchanger 305 exchange heat with the surrounding environment to realize the cooling mode or heating mode of the heat pump unit 30 .

The cooling or heating principle of the heat pump unit 30 is similar to that of the water source machine 10 , and will not be repeated here.

In some embodiments, the first compressor 302 is configured to compress the refrigerant so that the low-pressure refrigerant is compressed to form the high-pressure refrigerant. The first compressor 302 has a larger temperature operating range.

For example, the first compressor 302 can work at an ambient temperature ranging from -26°C to 48°C, so that the heat pump unit 30 can produce heat throughout the year, and the temperature of the hot water produced by the heat pump unit 30 and the water tank 20 can be at 20°C. ℃～55℃.

In some embodiments, the first throttling element 309 is configured to control the flow and pressure of the refrigerant flowing through the first throttling element 309 . For example, the first throttling element 309 is a pressure reducer or an electronic expansion valve.

In some embodiments, the third heat exchanger 305 may be a fin heat exchanger or a micro-channel heat exchanger.

The following mainly takes the third heat exchanger 305 as a fin heat exchanger and the second heat exchanger 301 as a sleeve heat exchanger as an example for illustration, however, this should not be construed as a limitation of the present disclosure.

In some embodiments, as shown in FIG. 3 , the heat pump unit 30 includes a first four-way valve 303 . The first four-way valve 303 is connected to the refrigerant circuit. The first four-way valve 303 is configured to switch the flow direction of the refrigerant in the refrigerant circuit, so that the heat pump unit 30 executes a cooling mode or a heating mode.

In some embodiments, the heat pump unit 30 further includes a gas-liquid separator 304 and a filter 309'.

The gas-liquid separator 304 is arranged in the refrigerant circuit, and is configured to separate the refrigerant from gas and liquid, so as to prevent the liquid refrigerant from entering the first compressor 302 to cause liquid hammer.

The filter 309 ′ is arranged in the refrigerant circuit to filter the refrigerant and prevent impurities from entering the third heat exchanger 305 .

In some embodiments, as shown in FIG. 3 , the heat pump unit 30 further includes an economizer 307 and a second throttling element 308 , which is beneficial to improve the heating capacity of the heat pump unit 30 at low temperature.

The economizer 307 includes a first port 371 , a second port 372 , a third port 373 and a fourth port 374 .

The first port 371 is connected to the second indoor unit interface B4 of the second heat exchanger 301 , and the second port 372 is connected to the inlet of the third heat exchanger 305 . The third port 373 connects the flow path between the second port 372 and the inlet of the third heat exchanger 305 through the second throttling element 308 to form a branch 315 . The fourth port 374 is connected to the air supply port 3022 of the first compressor 302 , so as to provide the first compressor 302 with an air supply volume.

The structure and function of the second throttling element 308 are similar to those of the first throttling element 309 , which will not be repeated here.

When the first compressor 302 is working, the first compressor 302 compresses the low-temperature and low-pressure refrigerant entering the first compressor 302, so that the refrigerant becomes a high-temperature and high-pressure gas. Afterwards, the high-temperature and high-pressure gaseous refrigerant flows into the first four-way valve 303 , and enters the second heat exchanger 301 through the second refrigerant interface B3 for condensation after passing through the first four-way valve 303 . During the condensation process, the refrigerant changes from gaseous state to liquid state, and releases heat in the second heat exchanger 301 , so that heat can be exchanged with water flowing from the water tank 20 into the second heat exchanger 301 .

Wherein, water can enter the second heat exchanger 301 through the second water inlet B1, and flow out of the second heat exchanger 301 through the second water outlet B2.

The condensed liquid refrigerant flows from the second indoor unit interface B4 to the economizer 307 .

After passing through the economizer 307, a part of the refrigerant passes through the third heat exchanger 305, a filter 309' (the filter 309' on the upstream side of the first throttling element 309 as shown in FIG. 3 ) and the first throttling element 309 in sequence. For throttling and pressure reduction. Then the refrigerant enters the third heat exchanger 305 again through another filter 309 ′ (the filter 309 ′ on the downstream side of the first throttling element 309 as shown in FIG. 3 ), and evaporates in the third heat exchanger 305 . Afterwards, the refrigerant passes through the first four-way valve 303 again, enters the gas-liquid separator 304 , and finally returns to the suction port of the first compressor 302 .

After passing through the economizer 307 , another part of the refrigerant enters the economizer 307 again through the second throttling element 308 for heat exchange, and flows from the fourth port 374 to the air supply port 3022 of the first compressor 302 after the heat exchange.

The heat pump unit 30 can provide stable and continuous heat for the water tank 20 , so that the water tank 20 can provide a stable supplementary water source for the water source machine 10 .

In some embodiments, the heat pump unit 30 includes an air source heat pump unit capable of producing hot water throughout the year. The air source heat pump unit can cooperate with the water tank 20 to provide cold water or hot water to the water source machine 10 during cooling and heating.

In some embodiments of the present disclosure, the temperature of the hot water in the heat pump unit 30 may be in the range of 20°C to 55°C (such as 20°C, 25°C, 35°C, 45°C or 55°C, etc.), so as to meet the requirements of the water source machine 10. The demand for the temperature of the supplementary water source in winter work ensures the normal operation of the water source machine 10 . In this case, the first temperature range of the water temperature Tr in the water tank 20 may be set at 20°C to 25°C.

In addition, since the water source machine 10 operates at a higher temperature, its energy efficiency will decrease. Therefore, when the water source machine 10 operates within a certain temperature range (for example, the temperature range is 15° C. to 30° C.), its energy efficiency ratio is high. And the operation is stable. At this time, the low-temperature hot water generated by the heat pump unit 30 and the water tank 20 can meet the user's demand for water temperature when the water source machine 10 is heating in winter, and is conducive to improving the heating effect of the water source machine 10 and reducing the energy consumption of the water source machine 10 .

In some embodiments, as shown in FIG. 1 , the water tank 20 includes a first water supply port 201 , a second water supply port 202 , a first water return port 203 , and a second water return port 204 .

The first water supply port 201 communicates with the first water inlet A1 of the first heat exchanger 101, the first water return port 203 communicates with the first water outlet A2 of the first heat exchanger 101, and the second water supply port 202 communicates with the heat pump unit 30. The second water inlet B1 of the second heat exchanger 301 is connected, and the second water return port 204 is connected with the second water outlet B2 of the second heat exchanger 301 of the heat pump unit 30 .

The water tank 20, as an intermediate water storage device for the heat pump unit 30 and the water source unit 10, can exchange heat with the second heat exchanger 301 in the heat pump unit 30 and the first heat exchanger 101 of the water source unit 10, so that the heat pump unit 30 The generated heat is exchanged into the water tank 20 to heat the water in the water tank 20 . The water temperature Tr and the water flow in the water tank 20 are both stable, so as to provide a stable and continuous supplementary water source for the water source machine 10 and improve the operation stability of the water source machine 10 .

Fig. 4 is a schematic diagram of a heat pump unit and a water tank in a multi-connected system according to some embodiments.

In some embodiments, as shown in FIGS. 1 and 4 , the water tank 20 further includes a water inlet pipe 205 , a water outlet pipe 206 and a water replenishment pipe 207 . The water inlet pipe 205 serves as a pipeline between the second water return port 204 and the second water outlet B2, and the water outlet pipe 206 serves as a pipeline between the second water supply port 202 and the second water inlet B1. The water supply pipe 207 of the water tank 20 communicates with an external water source (for example, a tap water pipe).

As shown in FIG. 4 , a water pump 208 and a water filter 209 are provided on the outlet pipe 206 of the water tank 20 . The water pump 208 can send the water in the water tank 20 to the heat pump unit 30 to form a water flow circuit between the water tank 20 and the heat pump unit 30 . The water filter 209 can filter impurities in the water, so as to prevent the impurities in the water from entering the second heat exchanger 301 of the heat pump unit 30 and causing blockage. The water supply pipe 207 of the water tank 20 is provided with a water supply solenoid valve 210 . By controlling the opening and closing of the water replenishment solenoid valve 210 , the water replenishment control of the water tank 20 can be realized.

In some embodiments, the water tank 20 has a hollow cylindrical shape and is placed perpendicular to the horizontal plane.

In some embodiments, the water tank 20 includes a water level switch 4 . The water level switch 4 includes a plurality of stalls. The multiple stalls are arranged sequentially from bottom to top (M direction in FIG. 4 ), and correspond to multiple water level lines in the water tank 20 one by one. High gears correspond to high water levels, and low gears correspond to low water levels.

For example, the water level switch 4 includes four gears from bottom to top, that is, a first gear 41 , a second gear 42 , a third gear 43 and a fourth gear 44 . The water tank 20 includes four water level lines respectively corresponding to the four gear positions from bottom to top, ie, a first water level line, a second water level line, a third water level line and a fourth water level line.

In some embodiments, the water level switch 4 may be a float type water level switch, or other water level monitoring devices, such as an electrode type water level switch, which is not limited in the present disclosure.

In some embodiments, referring to FIG. 1 , the controller 40 is configured to control the heat pump unit 30 when the water source machine 10 is running, if the water inlet temperature Te at the first water inlet A1 is lower than the first preset temperature. open; if the water inlet temperature Te at the first water inlet A1 is greater than the second preset temperature, the heat pump unit 30 is controlled to be turned off.

In some embodiments, the first preset temperature is less than or equal to the second preset temperature, and when the first preset temperature is less than the second preset temperature, the first preset temperature and the second preset temperature form a second temperature range , the first preset temperature is the lower limit of the second temperature range, and the second preset temperature is the upper limit of the second temperature range. The second temperature range is [20°C, Th]. Wherein, Th is the maximum temperature of the water source in the heating process of the water source machine 10 , for example, Th is equal to 45° C. (ie Th=45° C.).

Among them, the maximum temperature Th of the water source of different models of the water source machine 10 is different. For the convenience of description, some embodiments in the present disclosure are mainly described by taking the maximum temperature Th of the water source equal to 45°C as an example. However, this cannot be understood as Limitations on this Disclosure.

The controller 40 is also configured to control the heat pump unit 30 to shut down if the water temperature Tr in the water tank 20 is greater than a third preset temperature when the heat pump unit 30 is in the on state; When the water temperature Tr is lower than the fourth preset temperature, the heat pump unit 30 is controlled to be turned on; the third preset temperature is greater than or equal to the fourth preset temperature. That is, the controller 40 can control the operating state (for example, on or off) of the heat pump unit 30 according to the inlet water temperature Te at the first water inlet A1 and the water temperature Tr in the water tank 20, so as to maintain the water temperature Tr in the water tank 20 Within the first temperature range (that is, the water temperature Tr is greater than or equal to the fourth preset temperature and less than or equal to the third preset temperature), the heat supplement effect of the heat pump unit 30 and the water tank 20 on the water source machine 10 can be improved, and Save energy.

Here, the fourth preset temperature is the lower limit of the first temperature range, and the third preset temperature is the upper limit of the first temperature range.

Fig. 5 is a flowchart of a multi-connection system according to some embodiments. Referring to FIG. 5 , the controller 40 is configured to perform S11 to S17.

In S11, the water source machine 10 starts to run.

In S12, the controller 40 determines whether the operation mode of the water source machine 10 is a heating mode. If yes, the controller 40 executes S13; if not, the controller 40 executes S121.

In S121, the controller 40 controls the heat pump unit 30 to shut down.

When the water source machine 10 is in a non-heating mode (for example, a cooling mode), there is no need to provide a heat source to supplement heat, and the controller 40 can control the heat pump unit 30 to shut down.

In S13, the controller 40 judges whether the inlet water temperature Te at the first water inlet A1 is higher than the second preset temperature or lower than the first preset temperature. If the inlet water temperature Te at the first water inlet A1 is greater than the second preset temperature, the controller 40 executes S14; if the inlet water temperature Te at the first water inlet A1 is lower than the first preset temperature, the controller 40 executes S16. If the inlet water temperature Te at the first water inlet A1 is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the controller 40 executes S131.

In S131, the controller 40 controls the heat pump unit 30 to keep on or off.

In some embodiments, as shown in FIG. 2 , a first temperature sensor 1011 is provided at the first water inlet A1 , and the first temperature sensor 1011 is configured to detect the inlet water temperature Te at the first water inlet A1 . The first temperature sensor 1011 is electrically connected to the controller 40 . The controller 40 can obtain the inlet water temperature Te at the first water inlet A1 through the first temperature sensor 1011 .

In some embodiments, the first preset temperature corresponding to the inlet water temperature Te may be equal to the fourth preset temperature corresponding to the water temperature Tr in the water tank 20 .

For example, when the fourth preset temperature is equal to 20°C and the third preset temperature is equal to 25°C, the first preset temperature is also equal to 20°C.

In S14, the controller 40 controls the heat pump unit 30 to shut down, and executes S15.

Under the condition that the water inlet temperature Te at the first water inlet A1 is not lower than 20°C, and the water temperature Tr in the water tank 20 is in the range of [20°C, Th], the water inlet temperature Te at the first water inlet A1 satisfies Require. At this time, the heat pump unit 30 can be turned off to save energy consumption.

In some embodiments, as shown in FIG. 4 , a second temperature sensor 211 is provided in the water tank 20, and the second temperature sensor 211 is configured to detect the water temperature Tr in the water tank 20. The second temperature sensor 211 is electrically connected to the controller 40. connect. The controller 40 can acquire the water temperature Tr in the water tank 20 through the second temperature sensor 211 .

In S15, the controller 40 controls the heat pump unit 30 to be turned on or off according to the water temperature Tr in the water tank 20 .

When the heat pump unit 30 is in the off state, the controller 40 monitors the water temperature Tr in the water tank 20 in real time. When the water temperature Tr in the water tank 20 is greater than the third preset temperature or lower than the fourth preset temperature, the controller 40 controls the heat pump unit 30 to turn off or on, so as to ensure that the water temperature Tr in the water tank 20 is at the specified temperature. The above first temperature range ensures that the water tank 20 can provide a stable supplementary water source for the water source machine 10 .

FIG. 6 is another flowchart of a multi-connection system according to some embodiments.

In some embodiments, as shown in FIG. 6 , when the heat pump unit 30 is in the off state, the controller 40 controls the heat pump unit 30 to be turned on or off according to the water temperature Tr in the water tank 20 , including S151 to S153 .

In S151, the controller 40 determines whether the water temperature Tr in the water tank 20 is lower than the fourth preset temperature. If yes, the controller 40 executes S152; if not, the controller 40 controls the heat pump unit 30 to remain in the closed state.

In S152, the controller 40 turns on the heat pump unit 30, and executes S153.

When the water temperature Tr in the water tank 20 is lower than the fourth preset temperature, the water temperature Tr in the water tank 20 is relatively low. At this time, turning on the heat pump unit 30 can heat the water in the water tank 20 , thereby ensuring that the water tank 20 can provide a stable supplementary water source for the water source machine 10 .

In S153, the controller 40 determines whether the water temperature Tr in the water tank 20 is greater than the third preset temperature. If yes, the controller 40 returns to execute S14; if not, the controller 40 continues to execute S152.

When the heat pump unit 30 is turned on, if the temperature Tr of the water in the water tank 20 obtained by the controller 40 is greater than the third preset temperature, the controller 40 turns off the heat pump unit 30 to save energy consumption.

When the heat pump unit 30 is in the on state, if the temperature Tr of the water in the water tank 20 obtained by the controller 40 is lower than the third preset temperature, the controller 40 controls the heat pump unit 30 to remain in the on state.

In S16, the controller 40 controls the heat pump unit 30 to turn on, and executes S17.

When the inlet water temperature Te at the first water inlet A1 is lower than 20° C., the inlet water temperature Te is relatively low. At this time, the water temperature Tr in the water tank 20 is not within the range of [20° C., Th), resulting in the water tank 20 not being sufficient to provide supplementary water to the water source machine 10 . At this time, the heat pump unit 30 needs to be turned on.

In S17, the controller 40 controls the heat pump unit 30 to be turned off or on according to the water temperature Tr in the water tank 20 .

When the heat pump unit 30 is turned on, the controller 40 monitors the water temperature Tr in the water tank 20 in real time. When the water temperature Tr in the water tank 20 is greater than the third preset temperature or lower than the fourth preset temperature, the controller 40 controls the heat pump unit 30 to be turned off or turned on.

In some embodiments, as shown in FIG. 6 , when the heat pump unit 30 is on, the controller 40 controls the heat pump unit 30 to be turned off or on according to the water temperature Tr in the water tank 20 , including S171 to S173 .

In S171, the controller 40 determines whether the water temperature Tr in the water tank 20 is greater than the third preset temperature. If yes, the controller 40 executes S172; if not, the controller 40 controls the heat pump unit 30 to keep on.

In S172, the controller 40 shuts down the heat pump unit 30, and executes S173.

When the water temperature Tr in the water tank 20 is greater than the third preset temperature, the water temperature Tr in the water tank 20 is higher. At this time, turning off the heat pump unit 30 can save energy consumption.

In S173, the controller 40 judges whether the water temperature Tr in the water tank 20 is lower than the fourth preset temperature. If yes, the controller 40 returns to execute S16; if not, the controller 40 controls the heat pump unit 30 to remain in the closed state.

When the heat pump unit 30 is in the off state, if the water temperature Tr in the water tank 20 obtained by the controller 40 is lower than the fourth preset temperature, the controller 40 turns on the heat pump unit 30 to provide heat energy for the water tank 20, thereby ensuring that the temperature in the water tank 20 The water temperature Tr is within the first temperature range.

When the heat pump unit 30 is in the off state, if the temperature Tr of the water in the water tank 20 acquired by the controller 40 is greater than the fourth preset temperature, the controller 40 controls the heat pump unit 30 to remain in the off state.

In some embodiments of the present disclosure, the heat pump unit 30 is used in conjunction with the water tank 20 to provide a stable and reliable supplementary water source for the water source machine 10, avoiding frequent shutdowns of the water source machine 10 due to low inlet water temperature Te, and improving the water source. The running stability of the machine 10. Moreover, the cost of the heat pump unit 30 and the water tank 20 is low and occupies a small space, which is convenient for arrangement.

The above embodiment achieves the purpose of saving energy consumption by controlling the operating state of the heat pump unit 30 and the water temperature Tr of the water tank 20 . But the present disclosure is not limited thereto.

(2) Embodiments associated with heat pump hot water systems

Some embodiments of the present disclosure provide a heat pump water heating system. As shown in FIG. 4 , the heat pump water heating system 100 includes the heat pump unit 30 , the water tank 20 and the controller 40 .

The controller 40 is electrically connected to the water pump 208 , the water supplement solenoid valve 210 and the water level switch 4 respectively. The controller 40 can obtain the water level of the water in the water tank 20 through the water level switch 4 , and control the actions of the water pump 208 and the replenishment solenoid valve 210 according to the water level.

FIG. 7 is a flow chart of a heat pump water heating system according to some embodiments. As shown in FIG. 7, the controller 40 is configured to execute S21 to S25.

In S21 , the controller 40 determines the water level control height L of the water tank 20 .

Wherein, the water level control height L is related to the bottom area of the water tank 20 and the daily average hot water consumption. The water level control height L can be calculated according to formula (1):

L=Q/S; (1)

Wherein, Q is the daily average hot water consumption in the previous n days; S is the bottom area of the water tank 20 . The water level control height L refers to the water level height in the water tank 20 of the daily average hot water consumption in the previous n days.

The water level control height L of the water tank 20 is calculated by the daily average hot water consumption of the previous n days, thus, by considering the user's water usage habit, an accurate water level control height L can be obtained.

Among them, n is any value between 3 days and 15 days, and this range can reflect the water demand of users within a certain period of time. For example, n may be 3 days, 5 days, 7 days, 9 days, 11 days, 13 days or 15 days, etc.

In S22, the controller 40 determines the water supplement level according to the water level control height L.

FIG. 8 is another flow diagram of a heat pump water heating system according to some embodiments.

In some embodiments, as shown in FIG. 8 , the controller 40 determining the water supply level according to the water level control height L includes S221 to S223 .

In S221 , the controller 40 judges whether the water level control height L is lower than the height of each gear of the water level switch 4 . If yes, the controller 40 executes S222; if not, the controller 40 executes S223.

In S222, the controller 40 uses the lowest gear among the multiple gears of the water level switch 4 as the water supplement gear.

In S223 , the controller 40 takes the gear whose height is lower than the water level control height L and the closest to the water level control height L among the multiple gears of the water level switch 4 as the water replenishing gear.

For example, as shown in FIG. 4 , if the water level control height L is lower than the height of each gear of the water level switch 4 , then the first gear 41 is used as the water supply gear. If the water level control height L is higher than the height of the first gear 41 and lower than the height of the second gear 42, then the first gear 41 is used as the water supply gear.

It should be noted that, when the water level control height L is equal to one of the multiple gears of the water level switch 4 , this gear can be directly used as the water supply gear, which is not limited in the present disclosure.

The water replenishment gear determined by the above method can replenish water to the water tank 20 in time, and ensure that the water tank 20 has a sufficient amount of water.

In S23 , the controller 40 takes each gear of the water level switch 4 higher than the water supply gear as the water stop gear respectively, and determines a corresponding water replenishment strategy.

In each replenishment strategy, when the water level in the water tank 20 is lower than the replenishment level, the water level switch 4 sends a signal to the controller 40 . The controller 40 controls the replenishment solenoid valve 210 to open to replenish water to the water tank 20 through the replenishment pipe 207 . When the water level of the water in the water tank 20 is higher than the stop water level, the water level switch 4 sends a signal to the controller 40, and the controller 40 controls the replenishment solenoid valve 210 to close to stop replenishing the water tank 20.

For example, when the controller 40 determines that the water replenishment gear is the first gear 41, the first water replenishment strategy includes: the water replenishment gear is the first gear 41, and the water stop gear is the first gear. Second gear 42.

The second water supply strategy includes: the water supply gear is the first gear 41 , and the water stop gear is the third gear 43 .

The third water supply strategy includes: the water supply gear is the first gear 41 , and the water stop gear is the fourth gear 44 .

Wherein, when the water supply gear is the third gear 43 , the water stop gear is the fourth gear 44 . At this point, there is only one water replenishment strategy, and there is no need to select a target water replenishment strategy.

When the water supply gear is the fourth gear 44 , the water volume in the water tank 20 cannot meet the user's daily usage requirements. At this time, it is necessary to adjust the temperature of the water in the water tank 20, or adjust the configuration of at least one of the heat pump unit 30 or the water tank 20 (such as setting parameters, the volume of the water tank 20, etc.).

In addition, in each replenishment strategy, the controller 40 may also control the replenishment solenoid valve 210 to open to replenish water to the water tank 20 through the replenishment pipe 207 when the water level in the water tank 20 is lower than or equal to the replenishment level. Moreover, the controller 40 may also control the replenishment solenoid valve 210 to close to stop replenishment of water to the water tank 20 when the water level of the water tank 20 is higher than or equal to the water stop gear.

In S24, the controller 40 calculates the heat dissipation Qs of the water tank for each replenishment strategy.

Fig. 9 is yet another flowchart of a heat pump water heating system according to some embodiments.

In some embodiments, as shown in FIG. 9 , the calculation by the controller 40 of the heat dissipation Qs of the water tank for each replenishment strategy includes S241 to S243 .

In S241, the controller 40 calculates the daily available hot water volume of each water replenishment strategy according to the average value between the water stop level of each water replenishment strategy and the height of the water replenishment level, and the bottom area S of the water tank 20 Qk.

For ease of description, the following mainly takes the first gear 41 as an example to illustrate how to calculate the daily available hot water quantity Qk for each water replenishment strategy.

Assuming that the water tank 20 is a hollow cylinder, the height of the water tank 20 is H, and the diameter of the water tank 20 is D, then the bottom area of the water tank 20 is

The bottom surface perimeter of the water tank 20 is C=πD, the total height of the water level switch 4 is 1m, the interval between two adjacent stalls is 0.25m, the height of the first stall 41 is 1m, and the height of the second stall 42 is 1.25m, the height of the third stall 43 is 1.5m, and the height of the fourth stall 44 is 1.75m.

The daily available hot water quantity of the i-th replenishment strategy is Qk _i ;

The daily available hot water quantity Qk ₁ of the first replenishment strategy = S×(1+1.25)/2;

The daily available hot water quantity Qk ₂ of the second replenishment strategy = S×(1+1.5)/2;

The daily available hot water quantity Qk ₃ of the third replenishment strategy = S×(1+1.75)/2.

In S242, the controller 40 uses the water replenishment strategy with the smallest height difference between the water stop gear and the water replenishment gear as a reference water replenishment strategy, and the set water temperature Ts corresponding to the reference water replenishment strategy is the target water temperature set by the user; Based on the principle that the total mixed water quantity _Qmw of each replenishment strategy on the user side is equal, the remaining replenishment water is calculated according to the daily available hot water quantity Qk of each replenishment strategy, the set water temperature Ts corresponding to the reference replenishment strategy, and the tap water temperature The set water temperature T corresponding to the strategy.

Wherein, the total mixed water quantity Q _mw of the water replenishment strategy on the user side refers to the total water quantity of mixed water of each water replenishment strategy on the user side, and the mixed water is formed by mixing hot water in the water tank 20 and cold water from the tap water pipe.

Assume that the target water temperature set by the user is 55°C, and the height difference between the stop water level and the water replenishment level of the first water replenishment strategy is the smallest. At this time, the first water replenishment strategy is the reference water replenishment strategy, and the set water temperature T1 corresponding to the first water replenishment strategy is the target water temperature set by the user, that is, T1 = 55°C.

Wherein, the set water temperature T refers to the temperature that the water in the water tank 20 needs to reach.

When the first water replenishment strategy is the reference water replenishment strategy, the controller 40 calculates the set water temperature T corresponding to the other water replenishment strategies based on the principle that the total mixed water volume Q _mw of each water replenishment strategy on the user side is equal.

For example, Qk ₁ is the daily available hot water volume of the first water replenishment strategy, T1 is the set water temperature corresponding to the first water replenishment strategy, T _Z is the tap water temperature, and T _Y is the user side water temperature (that is, the mixed water required by the user after the water temperature). Assume that the amount of tap water required for water at a temperature T _Y is x.

According to the formula (2), the formula (3) can be obtained:

T1×Qk ₁ +T _Z ×x=(Qk ₁ +x)×T _Y ; (2)

x=(T1-T _Y )×Qk ₁ /(T _Y -T _Z ); (3)

Then the total mixing water quantity Q _mw on the user side is:

Q _mw ＝x+Qk ₁ ＝(T1-Tz)×Qk ₁ /(T _Y -T _Z ); (4)

Therefore, the calculation formula of the total mixed water quantity Q _mw at the user side is:

Under the condition that the tap water temperature T _Z and the water temperature T _Y on the user side remain unchanged, since the total mixed water volume Q _mw of each water replenishment strategy on the user side is equal, that is, the first water replenishment strategy (that is, the reference water replenishment strategy) is on the user side The total mixed water volume _Qmw of the i-th replenishment strategy is equal to the total mixed water volume _Qmw on the user side:

Therefore, it can be concluded that:

Among them, i=2,3,...,m; m is the number of water replenishment strategies;

Ti is the set water temperature corresponding to the i-th replenishment strategy;

Qk _i is the daily available hot water volume of the i-th replenishment strategy;

Qk ₁ is the daily available hot water quantity of the first replenishment strategy (that is, the daily available hot water quantity Qk _s corresponding to the benchmark replenishment strategy);

T1 is the set water temperature corresponding to the first replenishment strategy (that is, the set water temperature Ts corresponding to the reference replenishment strategy);

T _Z is the tap water temperature.

Wherein, the tap water temperature T _Z is a preset threshold, and the threshold corresponds to the season. The ambient temperature can be detected by the corresponding temperature sensor to determine the corresponding season, so as to obtain the tap water temperature T _Z corresponding to the season.

For example, the heat pump water heating system 100 includes a third temperature sensor configured to detect an outdoor ambient temperature.

According to the calculation formula (7) of the set water temperature Ti corresponding to the i-th water replenishment strategy and the daily available hot water volume of each water replenishment strategy calculated in S241 (for example, the daily available hot water volume of the second water replenishment strategy Qk ₂ and the daily available hot water quantity Qk ₃ of the third replenishment strategy can calculate the set water temperature corresponding to the second to i-th replenishment strategies respectively, which is simple, convenient and accurate.

In S243, the controller 40 calculates the heat dissipation Qs of the water tank for each replenishment strategy according to the following formula (8):

Qs _i =K×Fi×(Ti-Ta); (8)

Among them, i=1,2,3,...,m; m is the number of water replenishment strategies;

Qs _i is the water tank heat dissipation of the i-th replenishment strategy;

K is the heat dissipation coefficient of the water tank 20; the unit is W/(K×m ² );

Ti is the set water temperature corresponding to the i-th replenishment strategy; the unit is °C;

Ta is the outdoor ambient temperature; the unit is °C;

Fi is the heat exchange area of the water tank for the i-th replenishment strategy, in m ² . The heat exchange area of the water tank can be calculated from the average of the heights of the water stop level of the i-th water supply strategy and the corresponding water supply level and the perimeter of the bottom surface of the water tank 20 .

For example, the heat exchange area of the water tank of the first replenishment strategy F1=πD×(1+1.25)/2;

The heat exchange area of the water tank of the second replenishment strategy F2=πD×(1+1.5)/2;

The heat exchange area of the water tank of the third replenishment strategy F3=πD×(1+1.75)/2.

The heat exchange area of the water tank refers to the contact area between the hot water corresponding to each replenishment strategy and the water tank 20 , and the hot water generates heat transfer with the outside through the contact part with the water tank 20 . The contact area includes the bottom area of the water tank 20 and the side area of the hot water in the water tank 20 corresponding to each replenishment strategy. Since only the side area of the hot water is different in each replenishment strategy, the bottom area of the water tank 20 may not be considered when calculating the heat exchange area of the water tank.

Through S241 to S243, the heat dissipation Qs of the water tank for each replenishment strategy can be calculated, so that the water replenishment strategy with the smallest heat dissipation Qs out of the water tank can be selected to replenish the water tank 20, reducing energy consumption.

In S25, the controller 40 selects the water replenishment strategy with the smallest heat dissipation of the water tank as the target water replenishment strategy, and executes the target water replenishment strategy.

For example, assuming that the water tank heat dissipation Qs ₃ of the third water replenishment strategy is the smallest, the controller 40 selects the third water replenishment strategy as the target water replenishment strategy, and executes the target water replenishment strategy. That is to say, at this time, the controller 40 sets the water supply level as the first level 41, the water stop level as the fourth level 44, and sets the water temperature as T3 to control the water supply solenoid valve 210 to open to allow the water to pass through the water supply pipe. 207 water tank 20 is replenished.

In the heat pump hot water system 100 of some embodiments of the present disclosure, the set water temperature and the water level in the water tank 20 can be controlled by the controller 40, which reduces the loss of heat, saves energy consumption, and can meet the user's water requirements. need. In addition, the heat pump hot water system 100 has a wider application range, and can ensure the energy-saving effect of the heat pump unit 30 under different heat pump units 30 and different application scenarios.

The higher the temperature of the water in the water tank 20 is, the greater the heat dissipation of the hot water stored in the water tank 20 is. Therefore, in order to accurately calculate the water tank heat dissipation Qs of each water replenishment strategy, after calculating the water tank heat dissipation Qs of each water replenishment strategy, it is necessary to correct the water tank heat dissipation Qs of each water replenishment strategy to obtain the corrected water tank The amount of heat dissipation Qz, so as to select the target water replenishment strategy.

Among them, in some embodiments of the present disclosure, various operating parameters of the heat pump unit 30 are dimensionless.

Fig. 10 is yet another flowchart of a heat pump water heating system according to some embodiments.

In some embodiments, as shown in FIG. 10 , the S25 further includes S251 and S252.

In S251, the controller 40 corrects the heat dissipation Qs of the water tank for each replenishment strategy to obtain the corrected heat dissipation Qz of the water tank.

For example, according to the following formula (9), the corrected water tank heat dissipation Qz for each replenishment strategy is calculated:

Qz _i =Qs _i ×ε _i ; (9)

Among them, i=1,2,3,...,m; m is the number of water replenishment strategies;

Qz _i is the corrected water tank heat dissipation of the i-th replenishment strategy;

Qs _i is the water tank heat dissipation of the i-th replenishment strategy;

ε _i is the energy efficiency correction parameter of the i-th replenishment strategy.

For example, Qz ₁ =Qs ₁ ×ε ₁ ; Qz ₂ =Qs ₂ ×ε ₂ ; Qz ₃ =Qs ₃ ×ε ₃ .

Wherein, the energy efficiency correction parameter is preset. When the model of the heat pump unit 30 is determined, the energy efficiency correction parameter ε corresponding to the set water temperature T can be preset. Different set water temperatures T correspond to different energy efficiency correction parameters ε.

For example, the energy efficiency correction parameter corresponding to the set water temperature of 55°C is 1.0; the energy efficiency correction parameter corresponding to the set water temperature of 54°C is 0.98; the energy efficiency correction parameter corresponding to the set water temperature of 53°C is 0.97; The parameter is 0.96; the energy efficiency correction parameter corresponding to the set water temperature of 51°C is 0.95.

In S252, the controller 40 selects the corrected water replenishment strategy with the smallest heat dissipation of the water tank as the target water replenishment strategy, and executes the target water replenishment strategy.

By using the energy efficiency correction parameter ε to correct the heat dissipation Qs of the water tank, the accuracy of the calculated heat dissipation Qs of the water tank can be improved, so that the target water replenishment strategy can be accurately selected.

Fig. 11 is yet another flowchart of a heat pump water heating system according to some embodiments.

In some embodiments, as shown in FIG. 11 , before performing S21 , the controller 40 is further configured to perform S26 and S27 .

In S26, the controller 40 judges whether the variation of daily hot water consumption on two adjacent days in the previous n days is within the second preset range. If yes, the controller 40 executes S27; if not, the controller 40 executes S21 to S25.

In S27, the controller 40 selects the target hydration strategy of the previous day.

When the changes in daily hot water consumption on two adjacent days in the previous n days are all within the second preset range (that is, the change is greater than or equal to the third preset threshold and less than or equal to the fourth preset threshold), the difference in the amount of hot water used by the user every day is small, therefore, the controller 40 can directly select the target water replenishment strategy of the previous day (such as yesterday).

The third preset threshold is the lower limit of the second preset range, and the fourth preset threshold is the upper limit of the second preset range.

Wherein, if the target water replenishment strategy of the previous day is not found, the controller 40 executes S21 to S25 to reselect the target water replenishment strategy.

When the variation of daily hot water consumption on two adjacent days in the previous n days is not within the second preset range (that is, the variation is greater than the fourth preset threshold, or smaller than the third preset threshold), the amount of hot water used by users varies greatly every day. Therefore, the controller 40 needs to execute S21 to S25 to reselect the target water replenishment strategy.

In some embodiments, the second preset range is [-10%, +10%].

For example, when n is equal to 3, the daily hot water consumption of the first day of the first three days is 1m ³ , the daily hot water consumption of the second day of the first three days is 0.9m ³ , and the daily hot water consumption of the first three days The daily hot water consumption in the third day is 0.95m ³ . The daily hot water consumption of the second of the previous three days has a -10% change from the daily hot water consumption of the first of the previous three days at said second preset Within the range [-10%, +10%]. The daily hot water consumption for the third of the previous three days is a +5.6% change from the daily hot water consumption for the second of the previous three days, which is at said second preset Within the range [-10%, +10%]. Therefore, the controller 40 may determine that the changes in daily hot water consumption on two adjacent days in the previous three days are all within the second preset range.

Since seven days is a complete work and rest cycle, including working days and rest days, it can completely and comprehensively reflect the situation of users using hot water and the operation of the heat pump unit 30 . Therefore, in the case of n=7, it can be accurately judged whether the daily hot water consumption of the heat pump unit 30 is stable according to the daily hot water consumption of the heat pump unit 30 in the previous seven days.

The heat pump hot water system 100 in some embodiments of the present disclosure, by analyzing the user's water habits, on the basis of ensuring that the user's hot water is sufficient, according to the heat dissipation corresponding to different water temperatures and water levels, and the energy efficiency correction parameters of different water temperatures, Select the water temperature and water level with the least heat dissipation of the water tank, thereby reducing heat loss, saving energy consumption, and improving the operating efficiency of the heat pump unit 30 .

In the following, the process executed by the controller 40 will be described as an example. Suppose, n=7, the water tank 20 is a hollow cylinder, the total height of the water level switch 4 is 1m, the interval between two adjacent stalls is 0.25m, the height of the first stall 41 is 1m, the second stall The height of 42 is 1.25m, the height of the third stall 43 is 1.5m, the height of the fourth stall 44 is 1.75m, and the tap water temperature Tz is 15°C.

After the heat pump unit 30 is installed and debugged, input the technical parameters of the water tank 20 through the wire controller or remote controller, for example, the diameter D (for example, D=1m) of the water tank 20 and the height H (for example, H=2m) of the water tank 20, etc. .

The controller 40 records the number N of water replenishment within seven days, the change value of the water level during each replenishment, and the target water temperature (for example, 55° C.) set by the user. Within seven days, the water tank 20 is replenished with the original plan, that is, the controller 40 starts the water replenishment when the water level in the water tank 20 is lower than the first gear 41, and the water level in the water tank 20 is higher than the fourth gear 44 If the water replenishment is stopped, the set water temperature T is equal to the target water temperature set by the user, that is, the set water temperature T is 55°C.

In this case, the controller 40 calculates the total water consumption Qt within seven days according to formula (10):

The unit is m ³ . (10)

At this time, the controller 40 calculates the daily average hot water consumption of the user in the previous seven days according to formula (11):

The unit is m ³ . (11)

In the case of D=1m, H=2m, N=10, and the target water temperature set by the user is 55°C, the controller 40 calculates the daily average hot water consumption Q according to formula (12):

The unit is m ³ . (12)

The controller 40 calculates the water level control height L according to formula (13):

The unit is m. (13)

Since the water level control height L is between the first gear 41 and the second gear 42 , the controller 40 confirms that the first gear 41 is the water supply gear.

The controller 40 sequentially determines the first water replenishment strategy, the second water replenishment strategy and the third water replenishment strategy.

The first water replenishment strategy includes: the water replenishment gear is the first gear 41 , and the water stop gear is the second gear 42 . At this time, the controller 40 starts water replenishment when the water level in the water tank 20 is lower than the first gear position 41 , and stops water replenishment when the water level in the water tank 20 is higher than the second gear position 42 .

The second water replenishment strategy includes: the water replenishment gear is the first gear 41 , and the water stop gear is the third gear 43 . At this time, the controller 40 starts water replenishment when the water level in the water tank 20 is lower than the first gear 41 , and stops water replenishment when the water level in the water tank 20 is higher than the third gear 43 .

The third water replenishment strategy includes: the water replenishment gear is the first gear 41 , and the water stop gear is the fourth gear 44 . At this time, the controller 40 starts the water supplement when the water level in the water tank 20 is lower than the first gear 41 , and stops the water supplement when the water level in the water tank 20 is higher than the fourth gear 44 .

Fig. 12 is a flow chart of calculating the heat dissipation of the water tank for each replenishment strategy according to some embodiments.

As shown in FIG. 12 , the controller 40 calculates the daily available hot water volume for each replenishment strategy.

The daily available hot water quantity Qk ₁ of the first replenishment strategy = S×(1+1.25)/2.

The daily available hot water quantity Qk ₂ of the second replenishment strategy = S×(1+1.5)/2.

Since the height difference between the water stop gear of the first water replenishment strategy and the water replenishment gear is the smallest, the controller 40 determines the first water replenishment strategy as the reference water replenishment strategy. At this time, the set water temperature T1 corresponding to the first replenishment strategy is equal to the target water temperature set by the user, that is, T1 = 55°C.

In this case, the controller 40 calculates the set water temperature T2 corresponding to the second water replenishment strategy and the set water temperature T3 corresponding to the third water replenishment strategy respectively according to formula (14) and formula (15).

In order to increase the comparison effect, the water replenishment strategy of the original plan set by the user is compared with the first to third water replenishment strategies in this application (see Table 1). The water replenishment strategy of the original solution includes: the controller 40 starts the water replenishment when the water level in the water tank 20 is lower than the first gear 41, and stops the water replenishment when the water level in the water tank 20 is higher than the fourth gear 44, Set the water temperature T as 55°C.

Table 1 Comparison table of the water replenishment strategy of the original scheme and the first to third water replenishment strategies

The controller 40 sequentially calculates the heat dissipation Qs of the water tank for each replenishment strategy according to the above formula (8).

Assuming that the water tank 20 is made of stainless steel, its heat dissipation coefficient K=50W/(K×m ² ) during static heat dissipation, and the outdoor ambient temperature Ta=20°C, calculate the heat dissipation Qs of the water tank for each replenishment strategy (see Table 2).

Qs ₁ =K×F1×(T1-Ta)=6185.

Qs ₂ =K×F2×(T2-Ta)=6086.

Qs ₃ =K×F3×(T3-Ta)=6047.

The heat dissipation of the water tank of the original scheme=K×F3×(55-Ta)=7559.

Table 2 Comparison table of heat dissipation of the water tank of the water supply strategy of the original scheme and the heat dissipation of the water tank of the first to third water supply strategies

The controller 40 corrects the heat dissipation Qs of the water tank for each replenishment strategy to obtain the corrected heat dissipation Qz of the water tank.

Query the energy efficiency correction parameters of the heat pump unit 30 under the four schemes to be 1.0, 1.0, 0.95, and 0.9 respectively, and calculate the corrected water tank heat dissipation Qz of different schemes according to the above formula (9) (see Table 3).

Qz ₁ =Qs ₁ ×ε ₁ =6185.

Qz ₂ =Qs ₂ ×ε ₂ =5782.

Qz ₃ =Qs ₃ ×ε ₃ =5442.

The corrected water tank heat dissipation of the original scheme = 7559 × 1 = 7559.

Table 3 Comparison table of the corrected water tank heat dissipation of the original scheme's water replenishment strategy and the corrected water tank heat dissipation of the first to third water replenishment strategies

It can be seen from Table 3 that the corrected heat dissipation of the water tank of the third replenishment strategy is the smallest, therefore, the controller 40 selects the third replenishment strategy as the target replenishment strategy.

The third water replenishment strategy includes: setting the water temperature to 48° C., and when the water level in the water tank 20 is lower than the first gear 41 , the controller 40 controls the water replenishment solenoid valve 210 to open for water replenishment. When the water level in the water tank 20 is higher than the fourth gear 44 , the controller 40 controls the replenishment solenoid valve 210 to close to stop the replenishment of water.

In the above embodiments, the purpose of energy saving is achieved by selecting the water supply strategy with the minimum heat dissipation of the water tank. But the present disclosure is not limited thereto.

(3) Implementation methods associated with heat pump units

FIG. 13 is a graph of energy efficiency of a heat pump unit at different operating frequencies according to some embodiments.

When the heat pump unit 30 operates at a high operating frequency and a high outlet water temperature, its operating energy efficiency will decrease. As shown in FIG. 13 , the operating energy efficiency of the heat pump unit 30 presents a changing trend similar to an upward convex parabola as the operating frequency increases. Therefore, the heat pump unit 30 has a main operating frequency range. For example, the main operating frequency range of the integrated air source heat pump unit is [55Hz, 65Hz].

When the first compressor 302 of the heat pump unit 30 operates within the main operating frequency range (that is, the operating frequency of the first compressor 302 is greater than or equal to the first preset frequency and less than or equal to the second preset frequency), the heat pump The operating energy efficiency of the unit 30 is relatively high.

Wherein, the first preset frequency is the lower limit value of the main operating frequency range, and the second preset frequency is the upper limit value of the main operating frequency range.

When the heat pump unit 30 is not operating within the main operating frequency range (for example, the heat pump unit 30 is in cooling mode or heating mode), the operating frequency of the first compressor 302 is higher than the second preset frequency.

It should be noted that, when the heat pump unit 30 starts to work, the first compressor 302 first runs at the first operating frequency. When the water temperature in the water tank 20 is close to the set water temperature T, the first compressor 302 operates at the second operating frequency. The first operating frequency is greater than the second operating frequency. The operating frequency of the heat pump unit 30 is the first operating frequency, that is, the operating frequency of the heat pump unit 30 is the highest operating frequency when the heat pump unit 30 is operating.

Figure 14 is a flow diagram of a heat pump assembly according to some embodiments. As shown in FIG. 14, the controller 40 is also configured to execute S31 to S33.

In S31, the controller 40 judges whether the variations of the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days are all within the first preset range (that is, whether the variation is greater than or equal to the first preset threshold , and less than or equal to the second preset threshold). If yes, the controller 40 executes S32; if not, the controller 40 executes S33.

Here, the first preset threshold is the lower limit of the first preset range, and the second preset threshold is the upper limit of the first preset range.

The operating parameters of the heat pump unit 30 include: at least one of the daily running time of the heat pump unit 30 , the set water temperature T of the water tank 20 or the power consumption of the first compressor 302 . In the following embodiments, the operating parameters of the heat pump unit 30 include the daily running time of the heat pump unit 30 , the set water temperature T of the water tank 20 and the power consumption of the first compressor 302 .

In S32, the controller 40 acquires the daily operating time of the heat pump unit 30 in the previous n days, and adjusts the operating frequency of the first compressor 302 and/or the operating frequency of the water tank 20 according to the daily operating time of the heat pump unit 30. Set the water temperature T.

In S33, the controller 40 keeps the operating frequency of the first compressor 302 and the set water temperature T of the water tank 20 unchanged.

Controller 40 In some embodiments, the controller 40 can judge according to the daily running time of the heat pump unit 30 in the previous n days, the daily set water temperature T of the water tank 20 and the daily power consumption of the first compressor 302. Whether the variations of the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days are all within the first preset range.

When the variation of the daily running time of the heat pump unit 30 on two adjacent days in the previous n days is within the first preset range, and the set water temperature T of the water tank 20 on the two adjacent days in the previous n days is When the variation is also within the first preset range, and the variation of the power consumption of the first compressor 302 on two adjacent days in the previous n days is also within the first preset range, the controller 40 obtains the daily running time of the heat pump unit 30, and adjusts the operating frequency of the first compressor 302 and/or the set water temperature T of the water tank 20 according to the daily running time.

When the variation of the daily running time of the heat pump unit 30 on two adjacent days in the previous n days is within the first preset range, the variation of the daily running time of the heat pump unit 30 is small. Therefore, the daily operating time can be considered stable.

When the changes in the set water temperature T of the water tank 20 on two adjacent days in the previous n days are all within the first preset range, the set water temperature T of the water tank 20 has little change. Therefore, it can be considered that the daily set water temperature T of the water tank 20 is stable.

When the variation of the power consumption of the first compressor 302 on two adjacent days in the previous n days is within the first preset range, the variation of the power consumption of the first compressor 302 is small. Therefore, it can be considered that the daily power consumption of the first compressor 302 is stable.

Through the above judgment conditions, the controller 40 can accurately determine that the variation of the operating parameters of the heat pump unit 30 in two consecutive days is within the first preset range, so that the controller 40 can accurately adjust the first compressor in the heat pump unit 30 The operating frequency of 302 and the set water temperature T are used to save energy consumption.

When the change amount of the daily running time of the heat pump unit on two adjacent days in the previous n days is not within the first preset range, or the change amount of the set water temperature T of the water tank 20 on two adjacent days in the previous n days If it is not within the first preset range, or the variation of the power consumption of the first compressor 302 on two adjacent days in the previous n days is not within the first preset range, the controller 40 determines that the heat pump unit 30 is in The change amount of the operating parameter on two adjacent days in the previous n days is not within the first preset range (that is, the change amount is greater than the second preset threshold or less than the first preset threshold), And keep the operating frequency and set water temperature T of the first compressor 302 unchanged.

When the variation of the daily running time of the heat pump unit 30 on two adjacent days in the previous n days is not within the first preset range (that is, the variation is greater than the second preset threshold, or less than the The first preset threshold), the daily running time varies greatly. Therefore, the daily operating time can be considered to be unstable.

When the change amount of the set water temperature T of the water tank 20 on two adjacent days in the previous n days is not within the first preset range (that is, the change amount is greater than the second preset threshold value, or less than the first preset threshold value, A preset threshold), the set water temperature T of the water tank 20 changes greatly. Therefore, it can be considered that the daily set water temperature T is unstable.

When the variation of the power consumption of the first compressor 302 on two adjacent days in the previous n days is not within the first preset range (that is, the variation is greater than the second preset threshold, or less than the The first preset threshold), the daily power consumption varies greatly. Therefore, it can be considered that the daily power consumption is not stable.

Through the above judgment conditions, the controller 40 can accurately determine that the variation of the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days is not within the first preset range, so that the controller 40 maintains the first compressor 302 The operating frequency and the set water temperature T remain unchanged.

In some embodiments, the first preset range is [-20%, +20%].

For example, when the variation of the daily running time of the heat pump unit 30 on two adjacent days in the previous n days is within [-20%, +20%], and the water tank 20 is set in the two adjacent days in the previous n days, The variations of the fixed water temperature T are all within [-20%, +20%], and the variations of the power consumption of the first compressor 302 in the previous n days are all within [-20%, +20% ], the controller 40 determines that the changes in the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days are all within the first preset range, and adjusts the operating time of the first compressor 302 according to the daily operating time. The operating frequency and the set water temperature T.

Wherein, the controller 40 can acquire and record various operating parameters of the heat pump unit 30 . For example, the target water temperature set by the user, the daily running time of the heat pump unit 30, the proportion of time the first compressor 302 operates in different frequency ranges, and the first compressor calculated according to the current value of the first compressor 302 302 power etc. In this case, the controller 40 may calculate the daily power consumption of the first compressor 302 according to the acquired operating parameters.

Wherein, the heat pump unit 30 has a current sensor capable of detecting the current of the first compressor 302 .

When the changes in the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days are all within the first preset range, it indicates that the daily required load of the building has a small change compared with the previous day, The daily required load of the building is relatively stable. At this time, the controller 40 may adjust the operating frequency and the set water temperature T of the first compressor 302 according to the daily operating time, thereby saving energy consumption.

In some embodiments, the operating frequency of the first compressor 302 is any value between 55 Hz and 100 Hz. For example, the operating frequency of the first compressor 302 may be 55Hz, 65Hz, 75Hz, 85Hz, 95Hz or 100Hz and so on.

Figure 15 is another flow diagram of a heat pump assembly according to some embodiments.

In some embodiments, as shown in FIG. 15 , the controller 40 acquires the daily running time of the heat pump unit 30 in the previous n days, and adjusts the first The operating frequency of the compressor 302 and/or the set water temperature T of the water tank 20 include S321 to S328.

In S321, the controller 40 obtains the daily running time of the heat pump unit 30 in the previous n days.

In S322, the controller 40 judges whether the daily running time of the heat pump unit 30 on the previous day is less than or equal to the first set duration t1. If yes, the controller 40 executes S323; if not, the controller 40 executes S324.

In some embodiments, the first set duration t1 is any value between 0h˜8h. For example, the first set duration t1 may be 0h, 2h, 4h, 6h or 8h and so on.

In S323, the controller 40 reduces the operating frequency of the first compressor 302 and lowers the set water temperature T.

For example, in the case that the first set duration t1 is 6 hours, if the daily running time of the heat pump unit 30 on the previous day is less than or equal to 6 hours, the controller 40 will reduce the operating frequency of the first compressor 302 and reduce the setting. Set the water temperature T.

In the case that the daily running time of the heat pump unit 30 on the previous day is less than or equal to the first set duration t1, the daily actual output load of the heat pump unit 30 is relatively small. At this time, it can be considered that the required load of the building is lower than the rated output load of the heat pump unit 30 . Therefore, the controller 40 can reduce the operating frequency of the first compressor 302 and lower the set water temperature T, thereby saving energy consumption.

In S324, the controller 40 judges whether the daily running time of the heat pump unit 30 on the previous day is less than or equal to the second set duration t2. If yes, the controller 40 executes S325; if not, the controller 40 executes S326.

In some embodiments, the second set duration t2 is any value between 8h and 16h. For example, the second set duration t2 may be 8h, 10h, 12h, 14h or 16h and so on.

In S325, the controller 40 reduces the operating frequency of the first compressor 302, and keeps the set water temperature T unchanged.

For example, when the first set time length t1 is 6h and the second set time length t2 is 12h, if the daily operation time of the heat pump unit 30 on the previous day is greater than 6h and less than or equal to 12h, the controller 40 will reduce the The operating frequency of the first compressor 302 and the control set water temperature T remain unchanged.

When the daily running time of the heat pump unit 30 on the previous day is greater than the first set time length t1 and less than or equal to the second set time length t2, the actual daily output load of the heat pump unit 30 is relatively small, and the building needs The load is slightly lower than the rated output load of the heat pump unit 30 . Therefore, the controller 40 can only reduce the operating frequency of the first compressor 302, thereby saving energy consumption. At this time, the controller 40 controls the set water temperature T to remain unchanged.

In S326, the controller 40 judges whether the daily running time of the heat pump unit 30 on the previous day is less than or equal to the third set duration t3. If yes, the controller 40 executes S327; if not, the controller 40 executes S328.

In some embodiments, the third set duration t3 is any value between 16h and 24h. For example, the third set duration t3 may be 16h, 18h, 20h, 22h or 24h and so on.

In some embodiments, the third set duration t3 may be greater than the second set duration t2, and the second set duration t2 may be greater than the first set duration t1.

In S327, the controller 40 controls the operating frequency and the set water temperature T of the first compressor 302 to remain unchanged.

For example, when the second set time length t2 is 12h and the third set time length t3 is 18h, if the daily operation time of the heat pump unit 30 on the previous day is greater than 12h and less than or equal to 18h, the controller 40 controls The operating frequency and set water temperature T of the first compressor 302 remain unchanged.

When the daily operating time of the heat pump unit 30 on the previous day is greater than the second set time length t2 and less than or equal to the third set time length t3, the actual daily output load of the heat pump unit 30 is appropriate, and the required load of the building Roughly equal to the rated output load of the heat pump unit 30 . Therefore, the controller 40 can control the operating frequency and the set water temperature T of the first compressor 302 to remain unchanged.

In S328, the controller 40 increases the operating frequency of the first compressor 302, and increases the set water temperature T or keeps the set water temperature T unchanged.

For example, in the case that the third set duration t3 is 18 hours, if the daily operation time of the heat pump unit 30 on the previous day is greater than 18 hours, the controller 40 increases the operating frequency of the first compressor 302 so that the The operating frequency returns to the operating frequency before adjusting the operating frequency and setting the water temperature T. Moreover, the controller 40 increases the set water temperature T or keeps the set water temperature T unchanged, and restores the set water temperature T to the set water temperature T before adjusting the operating frequency and the set water temperature T.

When the daily running time of the heat pump unit 30 on the previous day is greater than the third set duration t3, the daily actual output load of the heat pump unit 30 is relatively large, and the required load of the building is greater than the rated output load of the heat pump unit 30 . At this time, the heat pump unit 30 cannot meet the needs of the user, and the comfort of the user is affected. Therefore, the controller 40 increases the operating frequency of the first compressor 302, and increases the set water temperature T or keeps the set water temperature T unchanged, so as to meet the needs of the user and ensure the comfort of the user.

Figure 16 is yet another flow diagram of a heat pump assembly according to some embodiments.

In some embodiments, as shown in FIG. 16 , the controller 40 reduces the operating frequency of the first compressor 302 and lowers the set water temperature T, including S3231 to S3233.

In S3231, the controller 40 judges whether the operating frequency of the first compressor 302 is within the main operating frequency range (that is, whether the operating frequency is greater than or equal to the first preset frequency and less than or equal to the second preset frequency). If yes, the controller 40 executes S3233; if not, the controller 40 executes S3232.

In S3232, the controller 40 reduces the operating frequency of the first compressor 302 .

When the operating frequency of the first compressor 302 is greater than the second preset frequency, the controller 40 reduces the operating frequency of the first compressor 302 according to a set reduction amount.

In some embodiments, the set reduction amount is any value between 5 Hz and 20 Hz. For example, the set reduction amount may be 5 Hz, 10 Hz, 15 Hz or 20 Hz and so on.

In S3233, the controller 40 lowers the set water temperature T.

When the operating frequency of the first compressor 302 is greater than or equal to the first preset frequency and less than or equal to the second preset frequency, the controller 40 lowers the setting of the first compressor 302 according to the preset temperature. Set the water temperature T.

In some embodiments, the preset temperature is any value between 1°C and 5°C. For example, the preset temperature may be 1° C., 2° C., 3° C., 4° C. or 5° C. and so on.

In some embodiments of the present disclosure, when the daily running time of the heat pump unit 30 is less than or equal to the first set duration t1, the running frequency of the first compressor 302 is reduced every day (for example, every time the The operating frequency is reduced by 10 Hz), the controller 40 can limit the operating frequency of the first compressor 302 so that the operating frequency of the first compressor 302 is within the main operating frequency range of the heat pump unit 30 . Afterwards, the controller 40 gradually lowers the set water temperature T (for example, lowers the set water temperature T by 2° C. each time), so as to save energy consumption and avoid affecting the stability of the heat pump unit 30 .

In some embodiments, the controller 40 reduces the operating frequency of the first compressor 302, and controls the set water temperature T to remain unchanged, including S3251 to S3254.

In S3251, the controller 40 controls the set water temperature T to remain unchanged.

In S3252, the controller 40 judges whether the operating frequency of the first compressor 302 is within the main operating frequency range. If yes, the controller 40 executes S3254; if not, the controller 40 executes S3253.

In S3253, the controller 40 reduces the operating frequency of the first compressor 302 .

The method of reducing the operating frequency of the first compressor 302 in S3253 is similar to the above.

In S3254, the controller 40 controls the operating frequency of the first compressor 302 to remain unchanged.

In some embodiments of the present disclosure, when the daily running time of the heat pump unit 30 is greater than the first set time length t1 and less than or equal to the second set time length t2, by reducing the daily operation time of the first compressor 302 The operating frequency, the controller 40 may limit the operating frequency of the first compressor 302 so that the operating frequency of the first compressor 302 is within the main operating frequency range of the heat pump unit 30 . At this time, the required load of the building is slightly lower than the rated output load of the heat pump unit 30 , therefore, the controller 40 does not need to adjust the set water temperature T, and only adjusts the operating frequency of the first compressor 302 to save energy consumption.

In some embodiments, the controller 40 increases the operating frequency of the first compressor 302, and increases the set water temperature T or keeps the set water temperature T unchanged, including S3281 to S3283.

In S3281, the controller 40 determines whether the operating frequency of the first compressor 302 returns to the operating frequency before adjusting the operating frequency and the set water temperature T. If yes, the controller 40 executes S3283; if not, the controller 40 executes S3282.

In S3282, the controller 40 restores the operating frequency of the first compressor 302 to the operating frequency before adjusting the operating frequency and setting the water temperature T.

In S3283, the controller 40 restores the set water temperature T to the set water temperature T before adjusting the operating frequency and the set water temperature T.

In some embodiments of the present disclosure, when the daily operating time of the heat pump unit 30 is greater than the third set duration t3, the controller 40 first restores the operating frequency of the first compressor 302 to adjust the operating frequency frequency and the operating frequency before setting the water temperature T. Then restore the set water temperature T to the set water temperature before adjusting the operating frequency and the set water temperature T, thereby saving energy consumption and improving the stability of the heat pump unit 30 .

In some embodiments of the present disclosure, the controller 40 can record the running time, running frequency and set water temperature T of the heat pump unit 30, and can estimate The daily load required by the building. When the daily required load of the building does not change much and the daily required load of the building is lower than the rated output load of the heat pump unit 30, the controller 40 may limit the operating frequency of the first compressor 302, In order to reduce the energy consumption generated when the heat pump unit 30 operates in a high-frequency state. And afterwards, the controller 40 adjusts the set water temperature T to reduce the energy consumption of the heat pump unit 30 .

Therefore, the controller 40 can control the operating frequency and the set water temperature T of the first compressor 302 in the heat pump unit 30 according to the daily required load of the building, so as to improve the operating efficiency of the heat pump unit 30 . Moreover, through S321 to S328, the control process of the operating frequency and the set water temperature T can be reasonably refined, so as to ensure the user's comfort, the energy-saving effect of the heat pump unit 30 is improved, and the application range is wide.

In some embodiments, the above control steps performed by the controller 40 are applicable to the air source heat pump unit, and the control steps are not only applicable to the variable frequency air source heat pump unit, but also applicable to the fixed speed air source heat pump unit. The main operating frequency range of the fixed-speed air source heat pump unit is 45Hz-55Hz (for example, 45Hz, 50Hz or 55Hz).

Some embodiments of the present disclosure also provide a method for controlling a multi-connected system. The multi-connected system includes the above-mentioned water source machine 10 , heat pump unit 30 , water tank 20 and controller 40 .

Fig. 17 is a flowchart of a control method of a multi-connection system according to some embodiments. As shown in Fig. 17, the method includes S51 to S57.

In S51, the water source machine 10 starts to run.

In S52, the controller 40 determines whether the operation mode of the water source machine 10 is the heating mode. If yes, the controller 40 executes S53; if not, the controller 40 executes S521.

In S521, the controller 40 controls the heat pump unit 30 to shut down.

In S53, the controller 40 judges whether the water inlet temperature at the first water inlet is higher than the second preset temperature or lower than the first preset temperature. If the inlet water temperature at the first water inlet is greater than the second preset temperature, the controller 40 executes S54; if the inlet water temperature at the first water inlet is lower than the first preset temperature, the controller 40 executes S56. If the inlet water temperature at the first water inlet is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the controller 40 executes S531.

In S531, the controller 40 controls the heat pump unit 30 to keep on or off.

In S54, the controller 40 controls the heat pump unit 30 to shut down, and executes S55.

In S55, the controller 40 controls the heat pump unit 30 to be turned on or off according to the water temperature in the water tank 20 .

In S56, the controller 40 controls the heat pump unit 30 to turn on, and executes S57.

In S57, the controller 40 controls the heat pump unit 30 to be turned off or on according to the water temperature in the water tank 20 .

Fig. 18 is a flow chart of another method for controlling a multi-connection system according to some embodiments.

In some embodiments, as shown in FIG. 18 , S55 includes S551 to S553.

In S551, the controller 40 determines whether the water temperature in the water tank 20 is lower than the fourth preset temperature. If yes, the controller 40 executes S552; if not, the controller 40 returns to execute S54.

In S552, the controller 40 turns on the heat pump unit 30, and executes S553.

In S553, the controller 40 determines whether the water temperature in the water tank 20 is greater than the third preset temperature. If yes, the controller 40 returns to execute S54; if not, the controller 40 continues to execute S552.

In some embodiments, as shown in FIG. 18 , S57 includes S571 to S573.

In S571, the controller 40 determines whether the water temperature in the water tank 20 is greater than the third preset temperature. If yes, the controller 40 executes S572; if not, the controller 40 returns to execute S56.

In S572, the controller 40 shuts down the heat pump unit 30, and executes S573.

In S573, the controller 40 judges whether the water temperature in the water tank 20 is lower than the fourth preset temperature. If yes, the controller 40 returns to execute S56; if not, the controller 40 continues to execute S572.

Fig. 19 is a flow chart of another method for controlling a multi-connection system according to some embodiments.

In some embodiments, as shown in FIG. 19 , the method further includes S61 to S63.

In S61 , the controller 40 judges whether the change amounts of the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days are all within the first preset range. If yes, the controller 40 executes S62; if not, the controller 40 executes S63.

In S62, the controller 40 obtains the daily operating time of the heat pump unit 30 in the previous n days, and adjusts the operating frequency of the first compressor 302 and/or the operating frequency of the water tank 20 according to the daily operating time of the heat pump unit 30. Set the water temperature.

In S63, the controller 40 keeps the operating frequency of the first compressor 302 and the set water temperature of the water tank 20 unchanged.

The method for judging whether the variation of the operating parameters of the heat pump unit 30 on two adjacent days in the previous n days is within the first preset range has been described above, and will not be repeated here.

Fig. 20 is a flow chart of another method for controlling a multi-connection system according to some embodiments.

In some embodiments, as shown in FIG. 20 , the method further includes S71 to S75.

In S71 , the controller 40 determines the water level control height of the water tank 20 .

In S72, the controller 40 determines the water supplement level according to the water level control height.

In S73 , the controller 40 takes each gear of the water level switch 4 higher than the water supply gear as the water stop gear respectively, and determines a corresponding water replenishment strategy.

In S74, the controller 40 calculates the heat dissipation of the water tank for each replenishment strategy.

In S75, the controller 40 selects the water replenishment strategy with the smallest heat dissipation of the water tank as the target water replenishment strategy, and executes the target water replenishment strategy.

In some embodiments, as shown in FIG. 21 , S74 includes S741 to S743.

In S741, the controller 40 calculates the daily available hot water volume of each water replenishment strategy according to the average value between the water stop level of each water replenishment strategy and the height of the water replenishment level, and the bottom area of the water tank 20 .

In S742, the controller 40 uses the water replenishment strategy with the smallest height difference between the water stop gear and the water replenishment gear as a reference water replenishment strategy, and the set water temperature corresponding to the reference water replenishment strategy is the target water temperature set by the user; Based on the principle that the total mixed water volume of each water replenishment strategy on the user side is equal, according to the daily available hot water volume of each water replenishment strategy, the set water temperature and tap water temperature corresponding to the reference water replenishment strategy, the controller 40 calculates the corresponding set water temperature.

In S743, the controller 40 calculates the heat dissipation of the water tank for each water replenishment strategy according to the heat dissipation coefficient of the water tank 20, the heat exchange area of the water tank for each water replenishment strategy, the set water temperature and the outdoor ambient temperature corresponding to each water replenishment strategy.

The controller in some embodiments of the present disclosure includes a processor. The processor may include a central processing unit (CPU)), a microprocessor (microprocessor), an application specific integrated circuit (ASIC), and may be configured so that when the processor executes memory in a memory coupled to the controller When the program in the non-transitory computer-readable medium of , executes the corresponding operation described in the controller. Non-transitory computer-readable storage media may include magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tape), smart cards, or flash memory devices (e.g., erasable programmable read-only memory (EPROM) , card, stick, or keyboard drive).

The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone familiar with the technical field who thinks of changes or substitutions within the technical scope of the present disclosure should cover all within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims

A multi-line system, comprising:

The water source machine includes a first heat exchanger, and the first heat exchanger includes a first water inlet and a first water outlet;

The heat pump unit includes a second heat exchanger, and the second heat exchanger includes a second water inlet and a second water outlet;

The water tank includes a first water supply port, a first water return port, a second water supply port and a second water return port, the first water supply port communicates with the first water inlet, and the first water return port communicates with the first water outlet The water port is connected, the second water supply port is connected with the second water inlet, and the second water return port is connected with the second water outlet; wherein, the heat pump unit supplements heat for the water source machine through the water tank ;as well as

a controller, the controller is configured to:

When the water source machine is running, if the water inlet temperature at the first water inlet is lower than the first preset temperature, control the heat pump unit to start; if the water inlet temperature at the first water inlet is higher than the second preset temperature Set the temperature, and control the heat pump unit to shut down; the first preset temperature is less than or equal to the second preset temperature.
The multi-line system according to claim 1, wherein the controller is further configured to:

When the heat pump unit is turned on, if the water temperature in the water tank is greater than a third preset temperature, controlling the heat pump unit to be turned off;

When the heat pump unit is in the off state, if the water temperature in the water tank is lower than a fourth preset temperature, the heat pump unit is controlled to be turned on; the third preset temperature is greater than or equal to the fourth preset temperature.
The multi-connected system according to claim 1, wherein the heat pump unit further includes a first compressor; the controller is further configured to:

According to the operating parameters of the heat pump unit, the operating frequency of the first compressor and/or the set water temperature of the water tank are adjusted.
The multi-line system according to claim 3, wherein the controller is configured to:

If the changes in the operating parameters of the heat pump unit on two adjacent days in the previous n days are both greater than or equal to the first preset threshold and less than or equal to the second preset threshold, obtain the daily operating time of the heat pump unit , and adjust the operating frequency of the first compressor and/or the set water temperature of the water tank according to the daily operating time of the heat pump unit; the first preset threshold is smaller than the second preset threshold.
The multi-line system according to claim 4, wherein the controller is configured to:

If the daily running time of the heat pump unit is less than or equal to the first set duration, then reduce the set water temperature after reducing the operating frequency of the first compressor;

If the daily running time of the heat pump unit is greater than the first set time length and less than or equal to the second set time length, reduce the operating frequency of the first compressor and keep the set water temperature unchanged ; The second set duration is longer than the first set duration;

If the daily operating time of the heat pump unit is greater than the third set time, after increasing the operating frequency of the first compressor, increase the set water temperature or keep the set water temperature unchanged; The third set duration is greater than the second set duration.
The multi-cluster system according to claim 5, wherein the controller is configured to reduce the operating frequency of the first compressor, comprising:

Reduce the operating frequency of the first compressor according to the set reduction amount until the reduced operating frequency of the first compressor is greater than or equal to the first preset frequency and less than or equal to the second preset frequency, so The first preset frequency is lower than the second preset frequency.
The multi-connected system according to any one of claims 3 to 6, wherein the operating parameters of the heat pump unit include: the daily running time of the heat pump unit, the set water temperature of the water tank or the first At least one of the power consumption of the compressor.
The multi-connected system according to any one of claims 1 to 7, wherein the water tank further includes a water inlet pipe, a water outlet pipe, a water replenishment pipe, and a water level switch; the water inlet pipe and the water outlet pipe are respectively connected to the heat pump The unit is connected, and the water supply pipe is connected to the tap water pipe; the water level switch includes a plurality of gears arranged in sequence from bottom to top;

The controller is also configured to:

Determine the water level control height of the water tank, the water level control height is related to the bottom area of the water tank and the daily average hot water consumption;

According to the water level control height, determine the replenishment gear among the multiple gears;

Each gear of the water level switch higher than the water supply gear is used as a water stop gear respectively, and a corresponding water replenishment strategy is determined; in each water replenishment strategy, when the water level of the water tank is lower than the water replenishment gear When the water level of the water tank is higher than the water stop level, the water supply to the water tank is stopped;

Compute the heat dissipation from the tank for each replenishment strategy; and

Select the replenishment strategy with the minimum heat dissipation of the water tank as the target replenishment strategy, and implement the target replenishment strategy.
The multi-line system according to claim 8, wherein the controller is configured to:

If the water level control height is lower than the height of each gear of the water level switch, the gear with the lowest height among the multiple gears is used as the water supply gear;

If the water level control height is higher than the height of at least one gear of the water level switch, the height of the multiple gears is lower than the water level control height and the height is the closest to the water level control height. The position is used as the replenishment position.
The multi-line system according to claim 8 or 9, wherein each replenishment strategy corresponds to a set water temperature, and the controller is configured to:

According to the average value between the height of the water stop gear and the height of the water replenishment gear of each water replenishment strategy, and the bottom area of the water tank, calculate the daily available hot water volume of each water replenishment strategy;

The water replenishment strategy with the smallest height difference between the water stop gear and the water replenishment gear is used as a reference water replenishment strategy, and the set water temperature corresponding to the reference water replenishment strategy is the target water temperature set by the user;

Based on the principle that the mixed total water volume of each water replenishment strategy is equal on the user side, according to the daily available hot water volume of each water replenishment strategy, the set water temperature and tap water temperature corresponding to the benchmark water replenishment strategy, the corresponding settings for the remaining water replenishment strategies are calculated. set water temperature;

According to the heat dissipation coefficient of the water tank, the heat transfer area of the water tank for each water replenishment strategy, the set water temperature and the outdoor ambient temperature corresponding to each water replenishment strategy, the heat dissipation of the water tank for each water replenishment strategy is calculated.
The multi-line system according to claim 10, wherein the set water temperature corresponding to the other replenishment strategies satisfies the following relationship:

Wherein, i=2,3,...,m; m is the quantity of the described water replenishment strategy; Ti is the set water temperature corresponding to the i-th replenishment strategy; Qk i is the daily available hot water volume of the i-th replenishment strategy; Qk s is the daily available hot water volume of the benchmark water replenishment strategy; Ts is the set water temperature corresponding to the benchmark water replenishment strategy; T Z is the tap water temperature.
The multi-line system according to claim 10, wherein the heat dissipation of the water tank of each water replenishment strategy satisfies the following relationship:

Qs i =K×Fi×(Ti-Ta);

Among them, i=1,2,3,...,m; m is the quantity of the water replenishment strategy; Qs i is the heat dissipation of the water tank of the i-th water replenishment strategy; K is the heat dissipation coefficient of the water tank; Fi is the i-th The heat exchange area of the water tank of the i-th replenishment strategy; Ti is the set water temperature corresponding to the i-th replenishment strategy; Ta is the outdoor ambient temperature.
The multi-connected system according to any one of claims 8 to 12, wherein each water replenishment strategy corresponds to an energy efficiency correction parameter, and the controller is configured to select the water replenishment strategy with the smallest heat dissipation of the water tank as the target water replenishment strategy, including :

Calculate the corrected water tank heat dissipation of each water replenishment strategy according to the water tank heat dissipation of each water replenishment strategy and the energy efficiency correction parameters corresponding to the water replenishment strategy;

The water replenishment strategy with the minimum heat dissipation of the corrected water tank is selected as the target water replenishment strategy.
The multi-line system according to claim 8, wherein the controller is further configured to:

If the changes in daily hot water consumption on two adjacent days in the previous n days are both greater than or equal to the third preset threshold and less than or equal to the fourth preset threshold, perform the target replenishment of the previous day strategy; the third preset threshold is less than the fourth preset threshold;

If the variation of the daily hot water consumption in the previous n days is greater than the fourth preset threshold or smaller than the third preset threshold, reselect the target water replenishment strategy.
A control method for a multi-connected system, the multi-connected system includes a water source machine, a heat pump unit, a water tank and a controller, and the heat pump unit supplements heat for the water source unit through the water tank, the method comprising:

When the water source machine is running, if the temperature of the first water inlet of the water source machine is lower than the first preset temperature, the controller controls the heat pump unit to start; if the temperature of the first water inlet of the water source machine is greater than the second preset temperature, the controller controls the heat pump unit to shut down; the first preset temperature is less than or equal to the second preset temperature, and the first water inlet of the water source machine is the water source machine and the water inlet between the tank.
The method of claim 15, further comprising:

When the heat pump unit is turned on, if the water temperature in the water tank is greater than a third preset temperature, the controller controls the heat pump unit to be turned off;

When the heat pump unit is in the off state, if the water temperature in the water tank is lower than a fourth preset temperature, the controller controls the heat pump unit to be turned on; the third preset temperature is greater than or equal to the fourth preset temperature Set temperature.
The method of claim 15, the heat pump unit comprising a first compressor, the method further comprising:

According to the operating parameters of the heat pump unit, the controller adjusts the operating frequency of the first compressor and/or the set water temperature of the water tank.
According to the method according to claim 17, the adjusting the operating frequency of the first compressor and/or the set water temperature of the water tank according to the operating parameters of the heat pump unit comprises:

If the changes in the operating parameters of the heat pump unit on two adjacent days in the previous n days are both greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the controller obtains the temperature of the heat pump unit daily operating time, and adjust the operating frequency of the first compressor and/or the set water temperature of the water tank according to the daily operating time of the heat pump unit; the first preset threshold is less than the second preset threshold.
According to the method according to claim 15, the water tank includes a water level switch, and the water level switch includes a plurality of gears arranged sequentially from bottom to top, and the method further includes:

The controller determines the water level control height of the water tank, and the water level control height is related to the bottom area of the water tank and the daily average hot water consumption;

The controller determines the water supply gear among the multiple gears according to the water level control height;

The controller regards each gear of the water level switch higher than the water replenishment gear as the water stop gear respectively, and determines a corresponding water replenishment strategy; in each water replenishment strategy, when the water level of the water tank is lower than When the water replenishment gear is in place, start to replenish water to the water tank, and stop replenishing water to the water tank when the water level in the water tank is higher than the water stop gear;

the controller calculates the heat dissipation of the water tank for each replenishment strategy; and

The controller selects the water replenishment strategy with the smallest heat dissipation of the water tank as the target water replenishment strategy, and executes the target water replenishment strategy.
According to the method according to claim 19, each replenishment strategy corresponds to a set water temperature, and the controller calculates the heat dissipation of the water tank for each replenishment strategy, including:

According to the average value between the height of the water stop gear and the height of the water replenishment gear for each water replenishment strategy, and the bottom area of the water tank, the controller calculates the daily available hot water for each water replenishment strategy quantity;

The controller uses the water replenishment strategy with the smallest height difference between the water stop gear and the water replenishment gear as a reference water replenishment strategy, and the set water temperature corresponding to the reference water replenishment strategy is the target water temperature set by the user;

Based on the principle that the total mixed water volume of each water replenishment strategy is equal on the user side, the controller calculates the remaining water replenishment according to the daily available hot water volume of each water replenishment strategy, the set water temperature and tap water temperature corresponding to the reference water replenishment strategy The set water temperature corresponding to the strategy; and

According to the heat dissipation coefficient of the water tank, the heat exchange area of the water tank for each water replenishment strategy, the set water temperature and the outdoor ambient temperature corresponding to each water replenishment strategy, the controller calculates the heat dissipation of the water tank for each water replenishment strategy.