CN115388587B

CN115388587B - Method and device for controlling water chiller, water chiller and storage medium

Info

Publication number: CN115388587B
Application number: CN202211034709.4A
Authority: CN
Inventors: 王书森; 邓善营; 张捷; 王会超
Original assignee: Qingdao Haier Central Air Conditioner Co Ltd
Current assignee: Qingdao Haier Central Air Conditioner Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2024-02-23
Anticipated expiration: 2042-08-26
Also published as: CN115388587A

Abstract

The application relates to the technical field of air conditioners and discloses a method for controlling a water chilling unit, which comprises the following steps: under the condition that the cooling mode and the hot water mode of the water chilling unit are switched, determining a target operation mode; determining a state demand of the compressor in case the target operation mode is a hot water mode; according to the state requirement of the compressor, adjusting the operation parameters of the compressor; and controlling the water chiller to switch to a hot water mode. And if the running mode of the water chilling unit is switched to the state, determining a target running mode. In this way, the operation parameters of the compressor are adjusted before the mode switching of the chiller is controlled. By adjusting the operation parameters of the compressor, the mode switching is enabled to be in smooth transition, and the possibility of surge of the compressor is reduced. The application also discloses a device for controlling the water chilling unit, the water chilling unit and a storage medium.

Description

Method and device for controlling water chiller, water chiller and storage medium

Technical Field

The present application relates to the field of air conditioning technologies, and for example, to a method and an apparatus for controlling a water chiller, and a storage medium.

Background

The refrigerating process of the water chilling unit is a heat exchange process. During refrigeration, a large amount of heat is generated and needs to be dissipated through the condenser in order to reduce the compressor temperature. The emitted heat is not reused, and thus energy waste is caused.

The related art discloses a heat recovery system and a control method thereof, wherein the heat recovery system comprises a water chilling unit and a hot water tank, the water chilling unit comprises two condensers which are connected in parallel, one condenser and a cooling tower form a circulation loop, the other condenser and the hot water tank form a circulation loop, a bypass is arranged between a cooling water inlet pipeline and a cooling water outlet pipeline of the cooling tower, the bypass is controlled through an electric three-way valve arranged on a water inlet pipeline of the cooling tower, and a controller of the heat recovery system controls the output of the heat recovery system according to the difference between the temperature of cooling backwater and the temperature of hot water in the hot water tank and the difference between the temperature of hot water in the hot water tank and the set value of the temperature of hot water. The control method comprises the following steps: the controller of the heat recovery system controls the output of the heat recovery system according to the cooling backwater temperature, the difference between the hot water temperature in the hot water tank and the cooling backwater temperature, and the difference between the hot water temperature in the hot water tank and the hot water temperature setting value.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

when the hot water mode needs to be switched to, the water temperature of the hot water tank is higher than that of the cooling water. The pressure of the container is easy to rise, so that the pressure ratio of the water chilling unit is increased, and finally, the compressor is caused to surge.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a method, a device, a water chiller and a storage medium for controlling the water chiller, so as to reduce the possibility of surging of a compressor when the water chiller is switched to a hot water mode.

In some embodiments, the method comprises: determining a target operation mode under the condition that the water chilling unit operates in a refrigerating mode and a hot water mode switching state; determining a state demand of the compressor in case the target operation mode is a hot water mode; according to the state requirement of the compressor, adjusting the operation parameters of the compressor; and controlling the water chilling unit to switch to a hot water mode.

In some embodiments, the apparatus comprises: the system comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the method for controlling the water chiller when the program instructions are executed.

In some embodiments, the water chiller includes a device for controlling a water chiller as described above.

In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling a chiller.

The method, the device, the water chilling unit and the storage medium for controlling the water chilling unit provided by the embodiment of the disclosure can realize the following technical effects:

and if the running mode of the water chilling unit is switched to the state, determining a target running mode. If the target operating mode is a hot water mode, a status requirement of the compressor is determined. And adjusting the operation parameters of the compressor based on the state requirements of the compressor. And finally, controlling the water chilling unit to switch to a hot water mode. In this way, the operation parameters of the compressor are adjusted before the mode switching of the chiller is controlled. By adjusting the operation parameters of the compressor, the mode switching is enabled to be in smooth transition, and the possibility of surge of the compressor is reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic diagram of a chiller provided by an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a method for controlling a chiller according to an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of another method for controlling a chiller provided by an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of another method for controlling a chiller provided by an embodiment of the present disclosure;

FIG. 5 is a schematic illustration of another method for controlling a chiller provided by an embodiment of the present disclosure;

FIG. 6 is a schematic illustration of one application provided by an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of an apparatus for controlling a chiller according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of another apparatus for controlling a chiller according to an embodiment of the present disclosure.

Reference numerals:

1. a compressor; 2. an evaporator; 3. a condensing/total heat recovery unit; 4. a water tank; 41. a seventh temperature sensor; 5. a first pipeline; 51. a one-way valve; 6. a second pipeline; 61. an electronic expansion valve; 7. a third pipeline; 8. a first bypass line; 81. a first bypass valve; 9. a cooling water inlet pipeline; 91. a first temperature sensor; 10. a cooling water outlet pipeline; 101. a second temperature sensor; 11. a heat recovery water inlet line; 111. a heat recovery water pump; 112. a third temperature sensor; 12. a heat recovery water outlet pipeline; 121. a fourth temperature sensor; 13. a water supplementing pipeline; 131. an electromagnetic valve; 14. freezing a water inlet pipeline; 141. a fifth temperature sensor; 15. freezing a water outlet pipeline; 151. a sixth temperature sensor; 16. a second bypass line; 161. a second bypass valve; 162. and (3) bypassing the pump.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

Referring to fig. 1, an embodiment of the present disclosure provides a water chiller, including: a compressor 1, an evaporator 2, a condensation/total heat recovery 3 and a water tank 4. The outlet of the compressor 1 is connected to the refrigerant inlet of the condensation/total heat recovery device 3 via a first line 5. The first pipe 5 is provided with a check valve 51 for limiting the flow of the refrigerant in the first pipe 5 from the compressor 1 to the condensation/total heat recovery unit 3 only. The refrigerant outlet of the condensation/total heat recovery device 3 is communicated with the refrigerant inlet of the evaporator 2 through a second pipeline 6. The second pipeline 6 is provided with an electronic expansion valve 61. The refrigerant outlet of the evaporator 2 is connected to the inlet of the compressor 1 via a third line 7. Alternatively, the compressor 1 is a magnetic levitation compressor or an air levitation compressor.

A first bypass line 8 is provided between the evaporator 2 and the condensation/total heat recovery 3. The first bypass line 8 is provided with a first bypass valve 81. After the first bypass valve 81 is opened, the refrigerant flows from the evaporator 2 into the condensation/total heat recovery device 3.

The condensing/total heat recoverer 3 is composed of a condenser and a total heat recoverer. The condenser and the total heat recoverer are combined in a shell-and-tube container, and share a refrigerant system. But the internal waterway is divided by the partition board in the heat exchange tube and the end enclosure. This is the prior art and will not be described in detail.

The condenser is provided with a cooling water inlet communicated with a cooling water inlet pipeline 9 and a cooling water outlet communicated with a cooling water outlet pipeline 10. The cooling water inlet pipeline 9 and the cooling water outlet pipeline 10 are respectively provided with a first temperature sensor 91 and a second temperature sensor 101 for detecting the cooling water inlet temperature and the cooling water outlet temperature. The cooling water inlet pipeline 9 is also provided with a cooling water pump. After the cooling water pump is started, the cooling water flows into the condenser.

The total heat recoverer is provided with a first heat recovery water inlet and a first heat recovery water outlet. The water tank 4 is provided with a second heat recovery water inlet, a second heat recovery water outlet and a third heat recovery water inlet. The second heat recovery water outlet is communicated with the first heat recovery water inlet through a heat recovery water inlet pipeline 11. The heat recovery water intake pipe 11 is provided with a heat recovery water pump 111. After the heat recovery water pump 111 is turned on, the water in the water tank 4 is circulated to the total heat recovery device, and heat recovery is performed. The first heat recovery water outlet is communicated with the second heat recovery water inlet through a heat recovery water outlet pipeline 12. The hot water obtained by heat recovery is circulated to the water tank 4 through the heat recovery water outlet line 12. The third heat recovery water inlet is communicated with a water supplementing pipeline 13. The water replenishing line 13 is provided with a solenoid valve 131. After the solenoid valve 131 is opened, water is replenished into the water tank 4 through the water replenishing line 13. The heat recovery water inlet pipeline 11 and the heat recovery water outlet pipeline 12 are respectively provided with a third temperature sensor 112 and a fourth temperature sensor 121 for detecting the temperature of the heat recovery water inlet and the heat recovery water outlet.

The evaporator 2 is provided with a chilled water inlet communicated with a chilled water inlet pipeline 14 and a chilled water outlet communicated with a chilled water outlet pipeline 15. A fifth temperature sensor 141 and a sixth temperature sensor 151 are provided on the freezing water inlet line 14 and the freezing water outlet line 15, respectively, for detecting the temperatures of the freezing water inlet and the freezing water outlet.

A second bypass line 16 is provided between the chilled water inlet line 14 and the heat recovery water inlet line 11. The second bypass line 16 is provided with a second bypass valve 161 and a bypass pump 162. Wherein, the communication position of the second bypass pipeline 16 and the heat recovery water inlet pipeline 11 is positioned between the heat recovery water pump 111 and the second heat recovery water outlet. After the second bypass valve 161 and the bypass pump 162 are opened, water in the water tank 4 flows into the evaporator 2.

A seventh temperature sensor 41 is provided on the water tank 4 for detecting the temperature of the water in the water tank 4.

As shown in conjunction with fig. 2, an embodiment of the present disclosure provides a method for controlling a water chiller, including:

s201, determining a target operation mode of the water chilling unit under the condition that the operation refrigeration mode and the hot water mode are switched.

S202, determining the state requirement of the compressor under the condition that the target operation mode of the water chilling unit is a hot water mode.

S203, the water chiller adjusts the operation parameters of the compressor according to the state requirements of the compressor.

S204, the water chiller controls the water chiller to switch to the hot water mode.

When the water chiller operates in a state in which the cooling mode and the hot water mode are switched to each other, one case is switched from the cooling mode to the hot water mode, and the other case is switched from the hot water mode to the cooling mode. When the water chiller runs in the refrigeration mode, the cooling water pump is started, and the heat recovery water pump is stopped. And the water chiller performs refrigeration cycle. When the water chilling unit operates in a heating mode, the cooling water pump is stopped, and the heat recovery water pump is started. And (5) performing heat recovery circulation on the water chilling unit. Therefore, when the water chilling unit operates in the mode switching state, a target operation mode is determined first, namely, a mode to be switched to is determined. The target operating mode is a cooling mode or a hot water mode. If the target operating mode is a hot water mode, a status requirement of the compressor is determined. The state requirement of the compressor mainly characterizes the load and unload condition required by the compressor. And adjusting the operation parameters of the compressor according to the state requirements of the compressor so that the operation of the compressor meets the state requirements. And then controlling the water chilling unit to switch to the hot water mode.

In the embodiment of the disclosure, if the running mode of the water chilling unit is switched to a state, a target running mode is determined. If the target operating mode is a hot water mode, a status requirement of the compressor is determined. And adjusting the operation parameters of the compressor based on the state requirements of the compressor. And finally, controlling the water chilling unit to switch to a hot water mode. In this way, the operation parameters of the compressor are adjusted before the mode switching of the chiller is controlled. By adjusting the operation parameters of the compressor, the mode switching is enabled to be in smooth transition, and the possibility of surge of the compressor is reduced.

As shown in conjunction with fig. 3, an embodiment of the present disclosure provides another method for controlling a water chiller, including:

s211, acquiring the water temperature of the water tank or the temperature of heat recovery water by the water chilling unit under the condition that the running refrigeration mode and the hot water mode are switched.

S221, determining that the target running mode is a hot water mode under the condition that the water temperature of the water tank is smaller than a first temperature threshold value.

S231, determining that the target operation mode is a refrigeration mode when the heat recovery water temperature of the water chilling unit is greater than the second temperature threshold.

The processor is communicatively coupled to the seventh temperature sensor to obtain the tank water temperature. The processor is communicatively coupled to the third temperature sensor to obtain the heat recovery water temperature.

Setting:

preset condition 1: t (T) _{Water tank} <T1, wherein T _{Water tank} For tank water temperature, T1 is a first temperature threshold.

Preset condition 2: t (T) _{Heat out} >T2, wherein T _{Heat out} For the heat recovery water outlet temperature, T2 is a second temperature threshold.

When the water chilling unit operates in the refrigeration mode, if the water temperature of the water tank meets the preset condition 1, the water temperature of the water tank is too low. At this time, heat needs to be recovered to raise the temperature of water in the water tank. Thus, the target operation mode is determined to be the hot water mode. Alternatively, t1=ts-T _{Opening and closing} Wherein, ts is the set temperature of the water tank, T _{Opening and closing} The temperature difference is initiated for the hot water mode. Optionally, in the judgingBreak T _{Water tank} After meeting the preset condition 1, continuing to detect T _{Water tank} . If T _{Water tank} And if the condition 1 is met and the first preset time period t1 is continued, determining that the target operation mode is a hot water mode. Thus, T is continuously detected _{Water tank} And the water temperature of the water tank is in a stable state for a first preset time period. Misjudgment of the water temperature of the water tank is avoided, and accuracy of the detection result is improved. Alternatively, t1 is 3s. T (T) _{Opening and closing} Is 5 ℃. T1, ts and T _{Opening and closing} All can be set according to actual needs, and the embodiment does not limit the setting.

When the water chiller operates in the hot water mode, if the heat recovery water outlet temperature meets the preset condition 2, the water outlet temperature is higher. At this point there is no need to continue heat recovery. Thus, the target operation mode is determined to be the cooling mode. Alternatively, t2=ts+t _{Stop and stop} Wherein, ts is the set temperature of the water tank, T _{Stop and stop} The temperature difference is the shut-down temperature of the hot water mode. T is the same as _{Stop and stop} The setting can be performed according to actual needs, and the present embodiment does not limit the setting.

Therefore, whether the water chilling unit needs to switch the operation mode or not is judged through comparison of the water temperature of the water tank and the temperature of the heat recovery water with the corresponding temperature threshold value, and accordingly the target operation mode of the water chilling unit can be determined.

As shown in conjunction with fig. 4, an embodiment of the present disclosure provides another method for controlling a water chiller, including:

S212, under the condition that the target operation mode of the water chilling unit is a hot water mode, the outlet water temperature of the evaporator and the water temperature of the water tank are obtained.

S222, the water chilling unit determines the state requirement of the compressor according to the outlet water temperature of the evaporator and the water temperature of the water tank.

The processor of the water chilling unit is in communication connection with the sixth temperature sensor to obtain the outlet water temperature of the evaporator, namely the temperature of the chilled outlet water. The processor is also communicatively coupled to a seventh temperature sensor to obtain the tank water temperature. And determining the state requirement of the compressor according to the outlet water temperature of the evaporator and the water temperature of the water tank. The state requirements of the compressor include: the compressor needs to perform fast loading, normal regulation or shutdown.

Setting:

preset condition 3: t3 is less than or equal to T _{Steaming out} Wherein T is _{Steaming out} And T3 is a third temperature threshold for the outlet water temperature of the evaporator.

Preset condition 4: t (T) _{Water tank} >T4, wherein T _{Water tank} And T4 is a fourth temperature threshold value for the water temperature of the water tank.

Preset condition 5: t5 is less than or equal to T _{Steaming out} <T3, wherein T5 is a fifth temperature threshold.

Alternatively, t3=t _{Is provided with} -T _{Machine stop} /2，T5＝T _{Is provided with} -T _{The machine is stopped and the machine is stopped,} wherein T is _{Is provided with} To set temperature T _{Machine stop} The temperature difference is the shutdown temperature difference of the water chilling unit.

T4＝T _{Leng Jin} +ΔT, where T _{Leng Jin} For cooling the inlet water temperature. The value of Δt is inversely related to the pressure ratio. The cooling water temperature may characterize the pressure ratio. The smaller the pressure ratio, the safer the unit. The higher the tank temperature and therefore the greater the deltat, the higher the tank temperature can be allowed. Conversely, the larger the pressure ratio, the smaller the Δt. The specific value of Δt can be set according to actual needs, and the embodiment does not limit the Δt.

If preset condition 3 and preset condition 4 are met, it is determined that the compressor needs to perform a rapid load. This is because, when the preset condition 4 is satisfied, it means that the tank water temperature is much higher than the cooling water inlet temperature. When the hot water pump is started and the cooling water pump is closed, the pressure is increased due to the fact that the circulating water temperature at the condensation side is increased. The compressor operating pressure ratio is also increased considerably. If the pressure ratio increases much, but the compressor capacity does not match the rapid increase, compressor surge is caused. Therefore, before the water pump is switched, the capacity of the compressor is increased, and the surge risk caused by the increase of the pressure ratio is avoided.

If the preset condition 3 is satisfied, the preset condition 4 is not satisfied, and it is determined that the compressor needs to perform normal adjustment. This is because, when the preset condition 4 is not satisfied, it means that the difference in the tank water temperature and the cooling water inlet temperature is relatively small. At this time, switching the water pump does not cause the compressor pressure ratio to rise significantly, and does not bring about surge risk. The load of the unit is regulated normally according to the difference between the outlet water temperature of the evaporator and the target temperature. It should be noted that, whether in the cooling mode or the hot water mode, the unit load is adjusted according to the difference between the outlet water temperature of the evaporator and the target outlet water temperature of the evaporator.

If preset condition 5 is satisfied, preset condition 4 is not satisfied, and it is determined that the compressor needs to perform normal adjustment. The principle is the same and will not be described in detail here.

And if the preset condition 4 and the preset condition 5 are met, determining the state requirement of the compressor according to the number of the compressor heads. For a multi-compressor unit, the preset condition 5 is a water temperature condition of the nose. When the preset condition 5 is met for more than 30s, the nose-down logic is executed. After the nose is reduced, if the water temperature still meets the preset condition 5, the nose is continuously reduced. If the preset condition 5 is not met in the process of reducing the head, the outlet water temperature of the evaporator is increased, namely the preset condition 3 is met. At this time, the preset condition 3 and the preset condition 4 are satisfied, and thus it is determined that the compressor needs to perform the quick load.

If the reduction to only one head remains but still meets preset condition 5, or is otherwise a single compressor unit, it is determined that the compressor needs to execute shutdown logic. And after the compressor is controlled to stop, the water pump is switched. Thus there is no risk of surge. After the switching is finished, when the water temperature of the evaporator meets the starting temperature difference, the unit is automatically started.

Therefore, whether the outlet water temperature of the evaporator and the water temperature of the water tank meet each preset condition is judged, so that the state of the compressor to be executed is accurately determined, and the operation parameters of the compressor are accurately regulated subsequently.

Optionally, when the chiller adjusts the operation parameters of the compressor according to the state requirement of the compressor, if the state requirement of the compressor is that quick loading is performed, the compressor is controlled to perform quick loading, and the second preset duration is continued. The second preset time period may be 30s.

And if the state requirement of the compressor is that normal adjustment is executed, adjusting the rotating speed of the compressor according to the difference value of the outlet water temperature of the evaporator and the target outlet water temperature of the evaporator. This is the prior art and will not be described in detail.

And if the state requirement of the compressor is to execute the shutdown, controlling the compressor to execute the shutdown procedure. Specifically, if the chiller is a multi-head chiller, the head-reducing operation is performed. Up to T _{Water tank} <T _{Machine stop} And/2, or reducing to a single head, controlling the compressor to execute a shutdown process. If the water chiller is a single-head unit, the compressor is directly controlled to execute the shutdown process.

Thus, the state demand of the compressor is judged based on the outlet water temperature of the evaporator and the water temperature of the water tank, so that the operation of the compressor is controlled. The state of the compressor is matched with the outlet water temperature of the evaporator and the water temperature of the water tank, so that the possibility of surging of the compressor is reduced.

As shown in conjunction with fig. 5, an embodiment of the present disclosure provides another method for controlling a water chiller, including:

S214, controlling a heat recovery water pump to be started by the water chilling unit; and then controlling the cooling water pump to stop.

S205, when the target operation mode is the refrigeration mode, the water chilling unit is controlled to be switched to the refrigeration mode.

After the compressor is controlled to execute quick loading, normal adjustment or stop, the heat recovery water pump is controlled to be started. And after detecting that the heat recovery water flow switch is closed, controlling the cooling water pump to stop. This is because the heat recovery water flow switch is closed indicating that there is water flow for heat recovery, at which point the cooling pump is turned off again. Otherwise, the heat recovery water pump may fail, and the cooling pump is turned off when no water flow is detected, so that the pressure ratio is increased rapidly. In addition, in order to produce hot water, it is necessary to turn off the cooling pump so that the hot water is rapidly warmed up.

If the target operation mode is a refrigeration mode, the water chilling unit needs to be controlled to be switched from a hot water mode to the refrigeration mode. After the cooling mode is switched, the pressure ratio of the water chilling unit is not increased, so that the running parameters of the compressor do not need to be regulated, and the water chilling unit is directly controlled to be switched to the cooling mode. Specifically, the cooling water pump is controlled to be started. And after detecting that the heat recovery water flow switch is closed, controlling the heat recovery water pump to stop. This is because the heat recovery water flow switch is closed indicating that there is a water flow for heat recovery. The hot water temperature meets the requirement, and the heat recovery water pump is not required to be continuously started, so that the heat recovery water pump is controlled to stop.

Optionally, after the compressor is controlled to perform quick loading, the heat recovery water pump is controlled to be started. The bypass pump and the second bypass solenoid valve are then controlled to open to prevent the pressure ratio from rapidly increasing. Then judging the current pressure ratio P _{Ratio of} With a preset pressure ratio P _{Is provided with} Whether or not a preset condition 6 is satisfied: p (P) _{Ratio of} -P _{Is provided with} >P ₁ Wherein P is ₁ Is a pressure ratio threshold. If so, the current pressure ratio is indicated to be more different from the preset pressure ratio. At this time, the first bypass valve is controlled to be opened to further reduce the pressure ratio, thereby preventing the compressor from surging.

In practical application, as shown in fig. 6:

s601, the water chiller operates in a switching state of a refrigerating mode and a hot water mode.

S602, judging a current operation mode by the water chilling unit; if the cooling mode is operated, S603 is performed; if the heating mode is operated, S624 is performed.

S603, judging whether the water chilling unit meets the following conditions: t (T) _{Water tank} <T ₁ The method comprises the steps of carrying out a first treatment on the surface of the If yes, then S604 is performed; if not, S603 is performed.

S604, judging the relation between the water temperature of the water tank and the water outlet temperature of the evaporator and preset conditions 3, 4, 5 and 6 by the water chilling unit; if preset conditions 3 and 4 are satisfied, S605 is executed; if the preset condition 3 is satisfied and the preset condition 4 is not satisfied, S613 is performed; if the preset condition 5 is satisfied, the preset condition 4 is not satisfied, S613 is performed; if the preset conditions 4 and 5 are satisfied, S617 is performed.

S605, controlling the compressor by the water chiller to execute quick loading for 30 seconds; then S606 is performed.

S606, controlling a heat recovery water pump to be started by a water chilling unit; then S607 is performed.

S607, controlling the second bypass valve and the bypass pump to be opened by the water chilling unit; then S608 is performed.

S608, judging whether the water chilling unit meets the following conditions: p (P) _{Ratio of} -P _{Is provided with} >P ₁ The method comprises the steps of carrying out a first treatment on the surface of the If yes, then S609 is performed; if not, S610 is performed.

S609, controlling the first bypass valve to be opened by the water chilling unit; then S610 is performed.

S610, the water chilling unit judges whether a heat recovery water flow switch is closed or not; if yes, then S611 is performed; if not, S610 is performed.

S611, controlling a cooling water pump to stop by a water chilling unit; then S612 is performed.

And S612, after 30 seconds, the water chilling unit controls the first bypass valve, the second bypass valve and the bypass pump to be closed.

S613, controlling the compressor to execute normal adjustment by the water chilling unit; then S614 is performed.

S614, controlling a heat recovery water pump to be started by a water chilling unit; then S615 is performed.

S615, the water chilling unit judges whether a heat recovery water flow switch is closed or not; if yes, then execution S616; if not, S615 is performed.

S616, the water chiller controls the cooling water pump to stop.

S617, judging whether the water chilling unit is a multi-head unit or not by the water chilling unit; if yes, then execute S618; if not, S620 is performed.

S618, controlling the chiller to execute the nose reduction by the chiller; then S619 is performed.

S619, judging the relation between the outlet water temperature of the evaporator and the preset condition 5 and the residual quantity of the machine heads; if the preset condition 5 is satisfied and the remaining number of handpieces is 1, S620 is performed; if the preset condition 5 is not satisfied and the remaining number of heads is not less than 1, S605 is executed.

S620, controlling the compressor by the water chilling unit to execute a shutdown process; then S621 is performed.

S621, judging whether the compressor is stopped by the water chilling unit; if yes, then execution S622; if not, S621 is performed.

S622, controlling a heat recovery water pump to be started by a water chilling unit; then S623 is performed.

S623, controlling the cooling water pump to stop by the water chilling unit.

S624, judging whether the water chilling unit meets the following conditions: t (T) _{Heat out} >T ₂ The method comprises the steps of carrying out a first treatment on the surface of the If yes, then execution S625; if not, S624 is performed.

S625, controlling a heat recovery water pump to be started by a water chilling unit; then S626 is performed.

S626, the water chilling unit judges whether a heat recovery water flow switch is closed or not; if yes, then execution S627; if not, S626 is performed.

And S627, controlling the cooling water pump to stop by the water chilling unit.

As shown in conjunction with fig. 7, an embodiment of the present disclosure provides an apparatus for controlling a water chiller, including: a first determination module 71, a second determination module 72, an adjustment module 73, and a control module 74. The first determination module 71 is configured to determine a target operation mode in the case of a chiller operation cooling mode and a hot water mode switching state. The second determination module 72 is configured to determine a state demand of the compressor if the target operating mode is a hot water mode. The adjustment module 73 is configured to adjust an operating parameter of the compressor based on a status requirement of the compressor. The control module 74 is configured to control the chiller to switch to a hot water mode.

By adopting the device for controlling the water chilling unit provided by the embodiment of the disclosure, if the running mode of the water chilling unit is switched to a state, the target running mode is determined. If the target operating mode is a hot water mode, a status requirement of the compressor is determined. And adjusting the operation parameters of the compressor based on the state requirements of the compressor. And finally, controlling the water chilling unit to switch to a hot water mode. In this way, the operation parameters of the compressor are adjusted before the mode switching of the chiller is controlled. By adjusting the operation parameters of the compressor, the mode switching is enabled to be in smooth transition, and the possibility of surge of the compressor is reduced.

As shown in connection with fig. 8, an embodiment of the present disclosure provides an apparatus for controlling a chiller, including a processor (processor) 80 and a memory (memory) 81. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 82 and a bus 83. The processor 80, the communication interface 82, and the memory 81 may communicate with each other via the bus 83. The communication interface 82 may be used for information transfer. Processor 80 may invoke logic instructions in memory 81 to perform the method for controlling a chiller in accordance with the above-described embodiments.

Further, the logic instructions in the memory 81 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 81 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 80 executes the functional application and the data processing by executing the program instructions/modules stored in the memory 81, i.e., implements the method for controlling the chiller in the above-described embodiment.

The memory 81 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created according to the use of the terminal device, etc. In addition, the memory 81 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides a water chilling unit, which comprises the device for controlling the water chilling unit.

The disclosed embodiments provide a storage medium storing computer executable instructions configured to perform the above-described method for controlling a chiller.

The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for controlling a chiller, comprising:

determining a target operation mode under the condition that the water chilling unit operates in a refrigerating mode and a hot water mode switching state;

determining a state demand of the compressor in case the target operation mode is a hot water mode;

according to the state requirement of the compressor, adjusting the operation parameters of the compressor;

controlling the water chilling unit to switch to a hot water mode;

wherein said determining the state demand of the compressor comprises: acquiring the outlet water temperature of the evaporator and the water temperature of the water tank; determining the state requirement of the compressor according to the outlet water temperature of the evaporator and the water temperature of the water tank;

the method for determining the state requirement of the compressor according to the temperature of the evaporator and the water temperature of the water tank comprises the following steps:

under the condition that the outlet water temperature of the evaporator is greater than or equal to a third temperature threshold value and the water temperature of the water tank is greater than a fourth temperature threshold value, determining that the state requirement of the compressor is quick loading; and under the condition that the outlet water temperature of the evaporator is smaller than the third temperature threshold and larger than the fifth temperature threshold and the water temperature of the water tank is smaller than or equal to the fourth temperature threshold, determining the requirement of the state of the compressor as a preset regulation scheme.

2. The method of claim 1, wherein the determining the target operating mode comprises:

acquiring the water temperature of a water tank or the temperature of heat recovery water;

under the condition that the water temperature of the water tank is smaller than a first temperature threshold value, determining that the target operation mode is a hot water mode;

in the event that the heat recovery water temperature is greater than the second temperature threshold, the target operating mode is determined to be a cooling mode.

3. The method of claim 1, wherein said determining the status requirement of the compressor based on the evaporator temperature and the tank water temperature further comprises;

and under the condition that the outlet water temperature of the evaporator is smaller than the third temperature threshold and larger than the fifth temperature threshold and the water temperature of the water tank is larger than the fourth temperature threshold, determining the state requirement of the compressor according to the number of heads of the compressor.

4. A method according to claim 3, wherein said determining the status requirement of the compressor based on the number of heads of the compressor comprises:

under the condition that the unit comprises multiple compressors, if the outlet water temperature of the evaporator is smaller than a third temperature threshold and larger than a fifth temperature threshold for more than 30 seconds, determining that the state requirement of the compressors is a nose reduction; in the process of reducing the machine head, if the outlet water temperature of the evaporator does not meet the temperature threshold value which is smaller than the third temperature threshold value and larger than the fifth temperature threshold value, determining that the state requirement of the compressor is quick loading;

if only one head is left but still the evaporator outlet water temperature is less than the third temperature threshold and greater than the fifth temperature threshold, or the unit is a compressor unit, then the status requirement of the compressor is determined to be shutdown.

5. The method of claim 1, wherein the chiller comprises: a cooling water pump and a heat recovery water pump; the control of the water chiller to switch to a hot water mode includes:

firstly, controlling the heat recovery water pump to be started;

and then controlling the cooling water pump to stop.

6. The method of claim 1, wherein the chiller comprises: a cooling water pump and a heat recovery water pump; after the determination of the target operating mode, the method further comprises:

and under the condition that the target operation mode is a refrigeration mode, controlling the water chilling unit to switch to the refrigeration mode.

7. The method of claim 6, wherein said controlling the chiller to switch to a cooling mode comprises:

firstly, controlling the cooling water pump to be started;

and then controlling the heat recovery water pump to stop.

8. An apparatus for controlling a water chiller comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling a water chiller as claimed in any one of claims 1 to 7 when the program instructions are run.

9. A chiller plant comprising the apparatus for controlling a chiller plant of claim 8.

10. A storage medium storing program instructions which, when executed, perform the method for controlling a chiller as claimed in any one of claims 1 to 7.