Cold and hot water unit, control method and device thereof, and computer readable storage medium

Abstract

The embodiment of the application provides a cold and hot water unit and a control method and device thereof and a computer readable storage medium, the control method of the cold and hot water unit comprises the following steps: in response to receiving a start heating instruction, controlling the cold and hot water unit to start and enter a refrigeration mode; determining whether a reversing valve early reversing condition is met; in response to determining that the reversing valve early reversing condition is met, controlling the reversing valve to reverse, so that the cold and hot water unit is switched from the refrigeration mode to a heating mode; and in response to determining that the reversing valve early reversing condition is not met, after the cold and hot water unit operates in the refrigeration mode for a first preset time length, controlling the reversing valve to reverse, so that the cold and hot water unit is switched from the refrigeration mode to the heating mode, and the first preset time length is longer than a second preset time length.

Description

Technical Field

[0001] This application relates to the field of hot and cold water units, specifically to a hot and cold water unit and its control method, device, and computer-readable storage medium. Background Technology

[0002] In related technologies, when a chiller unit is started up for heating, there is a risk of damage and inability to operate normally. For example, during the switching process from startup to heating mode, the water-side heat exchanger in the chiller unit is prone to freezing and cracking, causing serious damage to the water-side heat exchanger and thus preventing the chiller unit from operating normally for heating. Summary of the Invention

[0003] This application provides a chilled and hot water unit and its control method, device, and computer-readable storage medium, which can control the reversing valve to switch in advance when there is a risk of damage to the chilled and hot water unit, such as ice formation on the water-side heat exchanger, to ensure the safe and normal operation of the chilled and hot water unit.

[0004] In a first aspect, embodiments of this application provide a control method for a chilled / hot water unit. The chilled / hot water unit includes a refrigerant circuit, a secondary refrigerant circuit, and a water-side heat exchanger. The refrigerant circuit and the secondary refrigerant circuit are connected via the water-side heat exchanger. A reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger. The control method for the chilled / hot water unit includes: in response to receiving a start heating command, controlling the chilled / hot water unit to start and enter a cooling mode; determining whether the conditions for early reversing of the reversing valve are met; in response to determining that the conditions for early reversing of the reversing valve are met, controlling the reversing valve to switch, so that the chilled / hot water unit switches from the cooling mode to the heating mode; in response to determining that the conditions for early reversing of the reversing valve are not met, after the chilled / hot water unit has been running in the cooling mode for a first preset time, controlling the reversing valve to switch, so that the chilled / hot water unit switches from the cooling mode to the heating mode.

[0005] In some embodiments, determining whether the early switching condition of the reversing valve is met includes: determining whether the duration of the water-side heat exchanger being in a preset state reaches a second preset duration, wherein the first preset duration is longer than the second preset duration; in response to determining that the duration of the water-side heat exchanger being in the preset state reaches the second preset duration, determining that the early switching condition of the reversing valve is met; in response to determining that the duration of the water-side heat exchanger being in the preset state does not reach the second preset duration, determining that the early switching condition of the reversing valve is not met; the preset state includes at least one of the following states: the refrigerant pressure of the water-side heat exchanger is less than or equal to a preset pressure; the refrigerant flow rate of the water-side heat exchanger is less than or equal to a preset flow rate.

[0006] In some embodiments, a compressor is provided in the refrigerant circuit, and the compressor is connected to the reversing valve; a circulating pump is provided in the refrigerant circuit, and the circulating pump is connected to the refrigerant side of the water-side heat exchanger; controlling the chiller unit to start and enter the cooling mode includes: controlling the circulating pump to start; after the circulating pump has been running for a third preset time, controlling the compressor to start and controlling the reversing valve to be in the cooling conduction state, so that the chiller unit enters the cooling mode.

[0007] In some embodiments, the chilled water unit includes an outdoor fan; controlling the start of the circulation pump includes: controlling the circulation pump and the outdoor fan to start synchronously.

[0008] In some embodiments, the refrigerant circuit includes a heat exchange path, a heat utilization path, and a bypass path. One end of the heat utilization path is connected to one end of the heat exchange path, and the two ends of the bypass path are respectively connected to the two ends of the heat exchange path. The refrigerant side of the water-side heat exchanger and the circulating pump are connected in series on the heat exchange path. The heat utilization path is provided with a heat utilization terminal and a first switch control valve connected in series, and the bypass path is provided with a second switch control valve. Before controlling the circulating pump to start, the chiller unit control method includes: controlling the first switch control valve to close and controlling the second switch control valve to open.

[0009] In some embodiments, after controlling the reversing valve to switch, the hot and cold water unit control method includes: controlling the first switch control valve to open and controlling the second switch control valve to close.

[0010] In some embodiments, the chilled water unit includes a compressor and an outdoor fan, the compressor being disposed on the refrigerant circuit and connected to the reversing valve; controlling the chilled water unit to start and enter the cooling mode includes: controlling the outdoor fan to start; after the outdoor fan has been running for a fourth preset time, controlling the compressor to start and controlling the reversing valve to be in the cooling conduction state, so that the chilled water unit enters the cooling mode.

[0011] Secondly, embodiments of this application provide a control device for a hot and cold water unit, comprising: a start-up circuit configured to, in response to receiving a start-up heating command, control the hot and cold water unit to start and enter a cooling mode; and a reversing circuit configured to perform the following operations: determining whether a reversing valve early reversing condition is met; in response to determining that the reversing valve early reversing condition is met, controlling the reversing valve to reversing, so that the hot and cold water unit switches from a cooling mode to a heating mode; and in response to determining that the reversing valve early reversing condition is not met, controlling the reversing valve to reversing after the hot and cold water unit has been running in cooling mode for a first preset time, so that the hot and cold water unit switches from a cooling mode to a heating mode.

[0012] Thirdly, this application provides a chilled / hot water unit, comprising: a refrigerant circuit, a refrigerant circuit, and a water-side heat exchanger, wherein the refrigerant circuit and the refrigerant circuit are connected for heat exchange through the water-side heat exchanger, the refrigerant circuit is provided with a reversing valve, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger; a memory storing a computer program; and a processor, wherein when the computer program is executed by the processor, it implements the chilled / hot water unit control method as described in any of the above embodiments.

[0013] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the above-described hot and cold water unit control method.

[0014] The chilled water unit control method provided in this application first controls the chilled water unit to start and enter the cooling mode. Then, it continuously monitors whether the conditions for early switching of the reversing valve are met. If the conditions for early switching of the reversing valve are not met, it controls the chilled water unit to continue running in the cooling mode for a first preset time, and then controls the reversing valve to switch. If the conditions for early switching of the reversing valve are met, it controls the reversing valve to switch early, so that the chilled water unit switches from the cooling mode to the heating mode in advance, eliminating the risk of damage to the operation of the chilled water unit and ensuring the safe and normal operation of the chilled water unit. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a chilled and hot water unit control method provided in some embodiments of this application;

[0017] Figure 2 This is a partial flowchart of a chilled and hot water unit control method provided in some embodiments of this application;

[0018] Figure 3 This is another partial flowchart of a chilled and hot water unit control method provided in some embodiments of this application;

[0019] Figure 4 This is another partial flowchart of a chilled and hot water unit control method provided in some embodiments of this application;

[0020] Figure 5 This is another partial flowchart of the control method for a chilled and hot water unit provided in some embodiments of this application;

[0021] Figure 6 This is a connection structure diagram of a hot and cold water unit provided in some embodiments of this application;

[0022] Figure 7 This is another connection structure diagram of the hot and cold water unit provided in some embodiments of this application.

[0023] Explanation of key component symbols:

[0024] 1-Hot and cold water unit, 10-Refrigerant circuit, 11-Reversing valve, 12-Compressor, 13-Outdoor heat exchanger, 20-Refrigerant circuit, 21-Heat exchange path, 211-Circulating pump, 22-Heat application path, 221-Heat application terminal, 222-First switch control valve, 23-Bypass path, 231-Second switch control valve, 30-Water-side heat exchanger, 40-Outdoor fan. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0028] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0029] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0030] In related technologies, when a chiller / hot water unit is started up for heating, it first needs to enter cooling mode and run in cooling mode for a preset time before switching to heating mode. During this process, the chiller / hot water unit faces certain risks of damage and malfunction. For example, the water-side heat exchanger in the chiller / hot water unit is prone to freezing and cracking, causing severe damage and ultimately preventing the unit from heating properly.

[0031] like Figure 1 As shown, in a first aspect, embodiments of this application provide a control method for a hot and cold water unit. The control method includes S10 to S40, which can control the reversing valve 11 to switch in advance when there is a risk of damage to the hot and cold water unit 1, such as ice formation on the water-side heat exchanger 30, so as to ensure the safe and normal operation of the hot and cold water unit 1.

[0032] like Figure 6 and Figure 7 As shown, the chiller unit 1 includes a refrigerant circuit 10, a refrigerant circuit 20, and a water-side heat exchanger 30. The refrigerant circuit 10 is equipped with a reversing valve 11, and the water-side heat exchanger 30 has a refrigerant side and a refrigerant side arranged opposite to each other. The reversing valve 11 is connected to the refrigerant side of the water-side heat exchanger 30. The refrigerant circuit 10 and the refrigerant circuit 20 are connected via the water-side heat exchanger 30, allowing the refrigerant circuit 10 to provide cooling to the refrigerant circuit 20. The refrigerant circuit 20 then transfers the obtained cooling to the batteries in the energy storage system to cool and dissipate heat from the batteries.

[0033] For the refrigerant circuit 10 and the refrigerant circuit 20 connected by heat exchange, the media between the refrigerant circuit 10 and the refrigerant circuit 20 are isolated from each other, and heat exchange occurs when the media flows through the water-side heat exchanger 30 located between the two circuits. Here, the refrigerant circuit 10 carries a refrigerant that can circulate, and the refrigerant circuit 20 carries a refrigerant such as water that can circulate. The water-side heat exchanger 30 is provided with at least two isolated flow channels, namely a first flow channel and a second flow channel. The first flow channel is located on the refrigerant side of the water-side heat exchanger 30, and the second flow channel is located on the refrigerant side of the water-side heat exchanger 30. The water-side heat exchanger 30 is connected to the refrigerant circuit 10 through the first flow channel, and the reversing valve 11 is connected to the first flow channel. The refrigerant flows through the water-side heat exchanger 30 through the first flow channel. The water-side heat exchanger 30 is connected to the refrigerant circuit 20 through the second flow channel, and the refrigerant flows through the water-side heat exchanger 30 through the second flow channel. In this way, the refrigerant and the heat transfer fluid can exchange heat when flowing through the water-side heat exchanger 30, thus realizing the heat exchange connection between the refrigerant circuit 10 and the heat transfer fluid circuit 20.

[0034] S10: In response to receiving the start heating command, control the chiller unit 1 to start and enter the cooling mode.

[0035] Here, the heating start command can be a user-issued start-up and heating operation command, which can be sent to the chiller unit 1 via input terminals such as a control panel, remote control, or remote control terminal. Upon receiving the heating start command, the chiller unit 1 is controlled to start up and then first enters cooling mode.

[0036] S20: Determine whether the conditions for early switching of directional valve 11 are met.

[0037] Here, the pre-switching condition for the reversing valve 11 can be preset in the controller of the chiller unit 1, serving as a criterion for determining whether to control the pre-switching of the reversing valve 11. The pre-switching condition for the reversing valve 11 can be determined according to actual usage needs and may include at least one risk condition. Each criterion is used to assess a type of operational risk after the chiller unit 1 is started and operates in cooling mode. For example, the pre-switching condition for the reversing valve 11 may include: the water-side heat exchanger 30 has a risk of freezing and cracking.

[0038] S30: In response to determining that the conditions for early switching of the reversing valve 11 are met, control the reversing valve 11 to switch so that the chilled water unit 1 switches from the cooling mode to the heating mode.

[0039] When the conditions for early reversing of the reversing valve 11 are met, it indicates that the chiller unit 1 is at risk of damage during its current cooling operation. If the chiller unit 1 continues to operate in cooling mode, it is easily damaged. At this time, the reversing valve 11 can be controlled to switch immediately, allowing the chiller unit 1 to switch from cooling mode to heating mode in an instant, thereby eliminating the operational risk of the chiller unit 1.

[0040] S40: In response to determining that the early switching condition of the reversing valve 11 is not met, after the chilled water unit 1 has been running in cooling mode for a first preset time, the reversing valve 11 is controlled to switch to heating mode so that the chilled water unit 1 switches from cooling mode to heating mode. Here, the first preset time can be preset in the controller of the chilled water unit 1; the specific value of the first preset time can be determined according to actual needs, and this application embodiment does not limit it.

[0041] If the conditions for early reversing of the reversing valve 11 are not met, it indicates that the chiller unit 1 has not yet been damaged during the current cooling operation, and the chiller unit 1 can continue to operate safely in cooling mode until the first preset time. Then, the reversing valve 11 is controlled to switch, so that the chiller unit 1 switches from cooling mode to heating mode.

[0042] Compared with related technologies, the chilled water unit control method provided in this application first controls the chilled water unit 1 to start and enter the cooling mode. Then, it continuously monitors whether the early switching condition of the reversing valve 11 is met. If the early switching condition of the reversing valve 11 is not met, the chilled water unit 1 is controlled to continue running in the cooling mode for a first preset time. Then, the reversing valve 11 is controlled to switch. When the early switching condition of the reversing valve 11 is met, the reversing valve 11 is controlled to switch early so that the chilled water unit 1 switches from the cooling mode to the heating mode in advance, eliminating the risk of damage to the operation of the chilled water unit 1 and ensuring the safe and normal operation of the chilled water unit 1.

[0043] like Figure 2 As shown, in some embodiments, S20 may include S21 to S23.

[0044] S21: Determine whether the duration of the water-side heat exchanger 30 in the preset state reaches the second preset duration, where the first preset duration is longer than the second preset duration. Here, the second preset duration can be preset in the controller of the hot and cold water unit 1; the specific value of the second preset duration can be determined according to actual needs, and this application embodiment does not limit it.

[0045] Here, the preset state may include at least one of the following states: the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to a preset pressure; the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to a preset flow rate. The preset pressure can be pre-set in the controller of the chiller unit 1 to reflect whether there is a risk of icing on the refrigerant side of the water-side heat exchanger 30; the specific value of the preset pressure can be determined according to actual needs, and this embodiment does not limit this; the refrigerant pressure of the water-side heat exchanger 30 can be measured by a pressure sensor. The preset flow rate can be pre-set in the controller of the chiller unit 1 to reflect whether there is a risk of icing on the refrigerant side of the water-side heat exchanger 30; the specific value of the preset flow rate can be determined according to actual needs, and this embodiment does not limit this; the refrigerant flow rate of the water-side heat exchanger 30 can be measured by a flow sensor.

[0046] S22: In response to the determination that the duration of the water-side heat exchanger 30 being in a preset state reaches a second preset duration, it is determined that the condition for the early switching of the reversing valve 11 is met.

[0047] S23: In response to the determination that the duration of the water-side heat exchanger 30 in the preset state has not reached the second preset duration, it is determined that the early switching condition of the reversing valve 11 is not met.

[0048] In some examples, the preset state can be that the refrigerant pressure of the water-side heat exchanger 30 is less than or equal to a preset pressure. If the refrigerant pressure of the water-side heat exchanger 30 remains less than or equal to the preset pressure for a continuous second preset duration (e.g., the second preset duration could be 2 minutes, and the refrigerant pressure of the water-side heat exchanger 30 remains less than or equal to the preset pressure for 2 consecutive minutes), it indicates that there is a risk of icing on the refrigerant side of the water-side heat exchanger 30 and a risk of freezing and cracking due to icing. In this case, it can be determined that the condition for early switching of the reversing valve 11 is met, and the reversing valve 11 can switch early to eliminate the risk of damage. If the duration for which the water-side heat exchanger 30 is in the state of refrigerant pressure less than or equal to the preset pressure does not reach the second preset duration (e.g., the second preset duration could be 2 minutes, and the duration for which the refrigerant pressure of the water-side heat exchanger 30 is less than 2 minutes), it indicates that there is no risk of icing on the refrigerant side of the water-side heat exchanger 30, and the reversing valve 11 does not need to switch early.

[0049] In other examples, the preset state can be that the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to a preset flow rate. If the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to the preset flow rate for a continuous second preset duration (e.g., the second preset duration could be 2 minutes, and the refrigerant flow rate of the water-side heat exchanger 30 is less than or equal to a preset pressure for 2 consecutive minutes), it indicates that there is a risk of icing on the refrigerant side of the water-side heat exchanger 30 and a risk of freezing and cracking due to icing. In this case, it can be determined that the condition for early switching of the reversing valve 11 is met, and the reversing valve 11 can switch early to eliminate the risk of damage. If the duration of the water-side heat exchanger 30 being in the state of refrigerant flow rate less than or equal to the preset flow rate does not reach the second preset duration (e.g., the second preset duration could be 2 minutes, and the duration of the water-side heat exchanger 30 being less than or equal to the preset pressure is less than 2 minutes), it indicates that there is no risk of icing on the refrigerant side of the water-side heat exchanger 30, and the reversing valve 11 does not need to switch early.

[0050] By setting S21 to S23, it is possible to accurately determine whether there is a risk after the chilled water unit 1 is started and runs in cooling mode. In this way, if there is a risk, the reversing valve 11 can be controlled to switch in advance, thereby eliminating the risk of damage to the chilled water unit 1 in a timely and accurate manner.

[0051] like Figure 6 and Figure 7 As shown, in some embodiments, a compressor 12 may be provided on the refrigerant circuit 10, and the compressor 12 is connected to the reversing valve 11. A circulation pump 211 may be provided on the refrigerant circuit 20, and the circulation pump 211 is connected to the refrigerant side of the water-side heat exchanger 30, for example, through a second flow channel. Figure 3 As shown, S10 may include S11 to S12.

[0052] S11: Control the start of circulating pump 211. Upon receiving a start heating command, the circulating pump 211 can be started to allow the refrigerant in the refrigerant circuit 20 to resume circulation.

[0053] S12: After the circulating pump 211 has been running for a third preset time, the compressor 12 is started and the reversing valve 11 is in the refrigeration conduction state, so that the chilled water unit 1 enters the refrigeration mode. Here, the third preset time can be preset in the controller of the chilled water unit 1; the specific value of the third preset time can be determined according to actual needs, and this embodiment does not limit it.

[0054] After the circulating pump 211 has been running for the third preset time, it can be determined that the refrigerant in the refrigerant circuit 20 has resumed normal circulation, and the heat exchange between the refrigerant circuit 10 and the refrigerant circuit 20 in the water-side heat exchanger 30 can be achieved. At this time, the compressor 12 can be started and the reversing valve 11 can be controlled to be in the refrigeration conduction state, so that the compressor 12 drives the refrigerant to circulate in the refrigerant circuit 10.

[0055] Here, the reversing valve 11 can have a cooling-on state and a heating-on state; for example, the reversing valve 11 can be in the cooling-on state when the power is off, and switch from the cooling-on state to the heating-on state when the power is on. After the circulating pump 211 has been running for a third preset period of time, the compressor 12 is started and the reversing valve 11 is de-energized, so that the chiller unit 1 enters the cooling mode.

[0056] In some examples, the chilled / hot water unit 1 may include an outdoor fan 40. Here, S11 may include S11'.

[0057] S11': Control the circulation pump 211 and outdoor fan 40 to start synchronously. Upon receiving the start heating command, the circulation pump 211 and outdoor fan 40 can be controlled to start synchronously. On the one hand, the circulation pump 211 is used to restore the circulation flow of the refrigerant in the refrigerant circuit 20, and on the other hand, the outdoor fan 40 is used to restore the circulation flow of the air around the outdoor heat exchanger 13, thereby reducing the discharge pressure of the compressor 12 when entering the cooling mode, so as to avoid triggering the high-pressure protection shutdown.

[0058] like Figure 6 and Figure 7 As shown, in some examples, the refrigerant circuit 20 may include a heat exchange path 21, a heat utilization path 22, and a bypass path 23. The refrigerant side of the water-side heat exchanger 30 and the circulating pump 211 are connected in series on the heat exchange path 21, and one end of the heat utilization path 22 is connected to one end of the heat exchange path 21. The heat utilization path 22 is provided with a heat utilization terminal 221 and a first on / off control valve 222 connected in series. The first on / off control valve 222 is used to control the on / off state of the heat utilization path 22. Figure 6 As shown, for example, the heating terminal 221 can be a water tap / shower head, and the heating flow path 22 can be a water supply flow path equipped with a water tap / shower head; one end of the heating flow path 22 is connected to one end of the heat exchange flow path 21, and the water tap / shower head is the end of the heating flow path 22 that is away from the heat exchange flow path 21. Figure 7As shown, and exemplarily, the heating terminal 221 can be a heating radiator / underfloor heating pipe, and the heat flow path 22 can be a heating flow path / underfloor heating flow path; the two ends of the heat flow path 22 are respectively connected to the two ends of the heat exchange flow path 21, that is, one end of the heat flow path 22 is connected to the end of the refrigerant side away from the circulation pump 211, and the other end of the heat flow path 22 is connected to the end of the circulation pump 211 away from the refrigerant side, so that the heat flow path 22 and the heat exchange flow path 21 are connected to form a heating circulation loop.

[0059] The two ends of the bypass flow path 23 are connected to the two ends of the heat exchange flow path 21 respectively. That is, one end of the bypass flow path 23 is connected to the refrigerant side away from the circulating pump 211, and the other end of the bypass flow path 23 is connected to the circulating pump 211 away from the refrigerant side. A second on / off control valve 231 is provided on the bypass flow path 23, which is used to control the opening and closing of the bypass flow path 23. Figure 4 As shown, prior to S11, the control method for the chilled and hot water unit may include S101.

[0060] S101: Control the first switch control valve 222 to shut off and control the second switch control valve 231 to open.

[0061] Upon receiving a heating start command, the system first controls the first switch control valve 222 to shut off, disconnecting the hot flow path 22 and the heat exchange flow path 21. Simultaneously, it controls the second switch control valve 231 to open, connecting the bypass flow path 23 and the heat exchange flow path 21 to form a bypass circulation loop. Then, the circulation pump 211 is started. Driven by the circulation pump 211, the refrigerant circulates along the heat exchange flow path 21 and the bypass flow path 23, preventing the cooler refrigerant from entering the hot flow path 22 and accidentally releasing cold water or causing an unexpected drop in indoor temperature, thus ensuring user comfort.

[0062] For example, after S30 or S40, the chilled water unit control method may include S50.

[0063] S50: Control the first switch control valve 222 to open and control the second switch control valve 231 to close.

[0064] After the chiller unit 1 switches from cooling mode to heating mode, the first switch control valve 222 can be opened to connect the heat flow path 22 and the heat exchange flow path 21 to form a heating circulation loop, and the second switch control valve 231 can be closed to disconnect the bypass flow path 23 and the heat exchange flow path 21. Driven by the circulating pump 211, the refrigerant will circulate along the heat exchange flow path 21 and the bypass flow path 23, absorbing heat at the water-side heat exchanger 30 and releasing it at the heat-using terminal 221, thereby providing hot water at a suitable temperature or heating the indoor air, thus better meeting the user's hot water or heating needs.

[0065] For example, after the chiller unit 1 has been running in heating mode for a fifth preset time, the first switch control valve 222 can be turned on and the second switch control valve 231 can be turned off to ensure that the temperature of the refrigerant has risen to a suitable temperature range. As another example, after the chiller unit 1 has been running in heating mode for a fifth preset time, the outlet water temperature of the refrigerant side of the water-side heat exchanger 30 can be continuously monitored, and after the outlet water temperature on the refrigerant side reaches the preset temperature, the first switch control valve 222 can be turned on and the second switch control valve 231 can be turned off to ensure that the temperature of the refrigerant has risen to a suitable temperature range. Here, the fifth preset time can be preset in the controller of the chiller unit 1; the specific value of the fifth preset time can be determined according to actual needs, and this embodiment does not limit this. Here, the preset temperature can be preset in the controller of the chiller unit 1; the specific value of the preset temperature can be determined according to actual needs, and this embodiment does not limit this.

[0066] In some embodiments, the chiller / hot water unit 1 may include a compressor 12 and an outdoor fan 40, wherein the compressor 12 is disposed on the refrigerant circuit 10 and connected to a reversing valve 11. Figure 5 As shown, S10 may include S13 to S14.

[0067] S13: Control the outdoor fan 40 to start. Upon receiving the start heating command, the outdoor fan 40 can be controlled to start, allowing the air around the outdoor heat exchanger 13 to resume circulation first, thereby reducing the discharge pressure of the compressor 12 when entering the cooling mode, so as to avoid triggering the high-pressure protection shutdown.

[0068] S14: After the outdoor fan 40 has been running for a fourth preset time, control the compressor 12 to start and control the reversing valve 11 to be in the cooling conduction state so that the chilled water unit 1 enters the cooling mode.

[0069] After the outdoor fan 40 has been running for the fourth preset time, it can be determined that the air around the outdoor heat exchanger 13 has returned to normal circulation. At this time, the compressor 12 can be started and the reversing valve 11 can be controlled to be in the refrigeration conduction state, so that the compressor 12 drives the refrigerant to circulate in the refrigerant circuit 10.

[0070] Secondly, embodiments of this application provide a control device for a hot and cold water unit. The control device includes: a start-up circuit configured to control the hot and cold water unit 1 to start and enter a cooling mode in response to receiving a start-up heating command; and a reversing circuit configured to perform the following operations: determining whether the reversing valve 11 is in advance; controlling the reversing valve 11 to switch in response to determining that the reversing valve 11 is in advance, so that the hot and cold water unit 1 switches from the cooling mode to the heating mode; and controlling the reversing valve 11 to switch in response to determining that the reversing valve 11 is not in advance, after the hot and cold water unit 1 has been running in the cooling mode for a first preset time, so that the hot and cold water unit 1 switches from the cooling mode to the heating mode, wherein the first preset time is longer than a second preset time.

[0071] like Figure 6 and Figure 7 As shown, in a third aspect, embodiments of this application provide a chilled / hot water unit 1, which includes a refrigerant circuit 10, a refrigerant circuit 20, a water-side heat exchanger 30, a processor, and a memory. The refrigerant circuit 10 and the refrigerant circuit 20 are connected via the water-side heat exchanger 30. A reversing valve 11 is provided on the refrigerant circuit 10, and the reversing valve 11 is connected to the refrigerant side of the water-side heat exchanger 30. The memory stores a computer program, which, when executed by the processor, implements the chilled / hot water unit control method provided in any of the above embodiments.

[0072] The processor is connected to the memory and can perform various actions and processes according to the programs stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor, and can be based on an x86 architecture or an ARM architecture.

[0073] The memory can be volatile or non-volatile, or may include both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM) used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory used in the methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0074] In some embodiments, a compressor 12 may be provided on the refrigerant circuit 10, and the compressor 12 is connected to the reversing valve 11. A circulating pump 211 may be provided on the refrigerant circuit 20, and the circulating pump 211 is connected to the refrigerant side of the water-side heat exchanger 30, for example, through a second flow channel. In some examples, the chiller unit 1 may include an outdoor fan 40 and an outdoor heat exchanger 13, which are correspondingly arranged. The outdoor heat exchanger 13 is disposed on the refrigerant circuit 20 and is connected to the reversing valve 11.

[0075] In some examples, the refrigerant circuit 20 may include a heat exchange path 21, a heat utilization path 22, and a bypass path 23. The refrigerant side of the water-side heat exchanger 30 and the circulating pump 211 are connected in series on the heat exchange path 21. One end of the heat utilization path 22 is connected to one end of the heat exchange path 21. The heat utilization path 22 is provided with a heat utilization terminal 221 and a first on / off control valve 222 connected in series. The first on / off control valve 222 is used to control the on / off state of the heat utilization path 22. The two ends of the bypass path 23 are respectively connected to the two ends of the heat exchange path 21, i.e., one end of the bypass path 23 is connected to the refrigerant side away from the circulating pump 211, and the other end of the bypass path 23 is connected to the circulating pump 211 away from the refrigerant side. The bypass path 23 is provided with a second on / off control valve 231, which is used to control the on / off state of the bypass path 23.

[0076] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0077] For example, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards, and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the embodiments of this application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0078] The above provides a detailed description of a hot and cold water unit and its control method, device, and computer-readable storage medium provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A control method for a hot and cold water unit, characterized in that, The chiller unit includes a refrigerant circuit, a refrigerant circuit, and a water-side heat exchanger. The refrigerant circuit and the refrigerant circuit are connected via the water-side heat exchanger. A reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger. The control method of the chiller unit includes: In response to receiving a heating start command, the chiller unit is controlled to start and enter cooling mode; Determine whether the duration of the water-side heat exchanger being in a preset state reaches a second preset duration, wherein the preset state includes at least one of the following states: the refrigerant pressure of the water-side heat exchanger is less than or equal to a preset pressure; the refrigerant flow rate of the water-side heat exchanger is less than or equal to a preset flow rate; In response to the determination that the water-side heat exchanger has been in the preset state for a duration of a second preset time, it is determined that the conditions for early switching of the reversing valve are met. In response to determining that the early switching condition of the reversing valve is met, the reversing valve is controlled to switch so that the chilled water unit switches from cooling mode to heating mode; In response to the determination that the duration of the water-side heat exchanger in the preset state has not reached the second preset duration, it is determined that the early switching condition of the reversing valve is not met; In response to the determination that the early switching condition of the reversing valve is not met, after the chilled water unit has been running in cooling mode for a first preset time, the reversing valve is controlled to switch to heating mode, wherein the first preset time is longer than the second preset time.

2. The control method for a hot and cold water unit according to claim 1, characterized in that, A compressor is provided in the refrigerant circuit, and the compressor is connected to the reversing valve; a circulating pump is provided in the refrigerant circuit, and the circulating pump is connected to the refrigerant side of the water-side heat exchanger; controlling the start-up of the chiller unit and its entry into cooling mode includes: Control the start of the circulating pump; After the circulating pump has been running for a third preset period of time, the compressor is started and the reversing valve is put into the refrigeration conduction state so that the chilled water unit enters the refrigeration mode.

3. The control method for a chilled / hot water unit according to claim 2, characterized in that, The chilled / hot water unit includes an outdoor fan; controlling the start of the circulating pump includes: The circulating pump and the outdoor fan are started synchronously.

4. The control method for a hot and cold water unit according to claim 2, characterized in that, The refrigerant circuit includes a heat exchange path, a heat utilization path, and a bypass path. One end of the heat utilization path is connected to one end of the heat exchange path, and the two ends of the bypass path are respectively connected to the two ends of the heat exchange path. The refrigerant side of the water-side heat exchanger and the circulating pump are connected in series on the heat exchange path. The heat utilization path is provided with a heat utilization terminal and a first switch control valve connected in series, and the bypass path is provided with a second switch control valve. Before controlling the circulation pump to start, the control method of the chiller unit includes: The first switch control valve is controlled to close, and the second switch control valve is controlled to open.

5. The control method for a chilled / hot water unit according to claim 4, characterized in that, After controlling the reversing valve to switch, the control method for the chilled / hot water unit includes: The first switch control valve is turned on, and the second switch control valve is turned off.

6. The control method for a hot and cold water unit according to claim 1, characterized in that, The chiller unit includes a compressor and an outdoor fan. The compressor is located on the refrigerant circuit and connected to the reversing valve. Controlling the chiller unit to start and enter cooling mode includes: Control the outdoor fan to start; After the outdoor fan has been running for a fourth preset period of time, the compressor is started and the reversing valve is put into the cooling conduction state so that the chilled water unit enters the cooling mode.

7. A control device for a hot and cold water unit, characterized in that, The chiller unit includes a refrigerant circuit, a refrigerant circuit, and a water-side heat exchanger. The refrigerant circuit and the refrigerant circuit are connected via the water-side heat exchanger. A reversing valve is provided on the refrigerant circuit, and the reversing valve is connected to the refrigerant side of the water-side heat exchanger. The chiller unit control device includes: The start-up circuit is configured to control the chiller unit to start and enter cooling mode in response to receiving a start-up heating command; The commutation circuit is configured to perform the following operations: Determine whether the duration for which the water-side heat exchanger is in a preset state reaches a second preset duration; In response to determining that the duration of the water-side heat exchanger being in a preset state reaches a second preset duration, it is determined that the condition for early switching of the reversing valve is met, wherein the preset state includes at least one of the following states: the refrigerant pressure of the water-side heat exchanger is less than or equal to a preset pressure; the refrigerant flow rate of the water-side heat exchanger is less than or equal to a preset flow rate. In response to determining that the early switching condition of the reversing valve is met, the reversing valve is controlled to switch so that the chilled water unit switches from cooling mode to heating mode; In response to the determination that the duration of the water-side heat exchanger being in a preset state has not reached the second preset duration, it is determined that the early switching condition of the reversing valve is not met. In response to the determination that the early switching condition of the reversing valve is not met, after the chilled water unit has been running in cooling mode for a first preset time, the reversing valve is controlled to switch to heating mode, wherein the first preset time is longer than the second preset time.

8. A hot and cold water unit, characterized in that, include: The refrigerant circuit, the refrigerant circuit, and the water-side heat exchanger are provided. The refrigerant circuit and the refrigerant circuit are connected by heat exchange through the water-side heat exchanger. The refrigerant circuit is equipped with a reversing valve, which is connected to the refrigerant side of the water-side heat exchanger. Memory, which stores computer programs; A processor, wherein the computer program, when executed by the processor, implements the hot and cold water unit control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps in the hot and cold water unit control method according to any one of claims 1 to 6.

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