CN113983729A - Method and device for judging bypass operation of water chilling unit - Google Patents
Method and device for judging bypass operation of water chilling unit Download PDFInfo
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- CN113983729A CN113983729A CN202111458494.4A CN202111458494A CN113983729A CN 113983729 A CN113983729 A CN 113983729A CN 202111458494 A CN202111458494 A CN 202111458494A CN 113983729 A CN113983729 A CN 113983729A
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- 239000000498 cooling water Substances 0.000 claims 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
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- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a method and a device for judging bypass operation of a water chilling unit. The method comprises the following steps: determining the effective states of at least two water coolers in the water chiller unit within preset effective time according to the switching state; wherein the active state comprises an active on state; acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in the effective opening state; calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature and the total pipe outlet water temperature of the water chilling unit; and judging the bypass state of the water chilling unit according to the bypass flow ratio. The invention provides a method and a device for judging bypass operation of a water chilling unit, which improve the diagnosis accuracy of a bypass state, reduce the diagnosis cost and avoid the conditions of low efficiency and energy consumption waste of a chiller caused by invalid bypass in operation.
Description
Technical Field
The embodiment of the invention relates to the technical field of detection, in particular to a method and a device for judging bypass operation of a water chilling unit.
Background
In the public building cold station, the energy consumption of the water chilling unit is relatively large, so that the energy consumption can be effectively reduced by improving the operation efficiency of the water chilling unit. The bypass operation of the water chilling unit is one of important factors influencing the operation efficiency, and the bypass operation of the water chilling unit means that under the cooling working condition, a valve of a water chilling unit in a closed state is not completely closed, so that water flows in the water chilling unit in the closed state, the water flow of the water chilling unit in an open state is reduced, and the operation efficiency of the water chilling unit is reduced.
The traditional method for identifying the bypass of the water chilling unit is to add a flow meter on each water chilling unit, and judge whether bypass operation exists or not by checking whether flow data exist in the flow meter on the water chilling unit in a closed state or not under a cold supply working condition.
Disclosure of Invention
The invention provides a method and a device for judging bypass operation of a water chilling unit, which improve the diagnosis accuracy of a bypass state, reduce the diagnosis cost and avoid the conditions of low efficiency and energy consumption waste of a chiller caused by invalid bypass in operation.
In a first aspect, an embodiment of the present invention provides a method for determining bypass operation of a water chilling unit, including:
determining the effective states of at least two water coolers in the water chiller unit within preset effective time according to the switching state; wherein the active state comprises an active on state;
acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in the effective opening state;
calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature and the total pipe outlet water temperature of the water chilling unit;
and judging the bypass state of the water chilling unit according to the bypass flow ratio.
Optionally, calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature, and a header pipe outlet water temperature of the chiller includes:
calculating a first difference value between the average backwater temperature and the average water outlet temperature;
calculating a second difference value between the total pipe water outlet temperature and the average water outlet temperature;
and determining the bypass flow ratio according to the ratio of the first difference value to the second difference value.
Optionally, determining a bypass state of the water chilling unit according to the bypass flow ratio includes:
and comparing the bypass flow ratio with a preset ratio, and if the bypass flow ratio is greater than the preset ratio and the time greater than the state exceeds the preset time, determining that the water chilling unit is in bypass operation.
Optionally, when the water chiller in the effective open state includes a main water chiller and an auxiliary water chiller, obtaining the average outlet water temperature of the water chiller in the open state includes:
and calculating an average value according to the outlet water temperature of the main water cooler, and taking the average value as the average outlet water temperature of the water cooler in the effective opening state.
Optionally, the effective state further includes an effective closing state, and before calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature, and a header outlet water temperature of the chiller, the method includes:
determining an effective water outlet temperature according to the return water temperature and the water outlet temperature of the water cooler in the effective closing state;
calculating a third difference value between the average return water temperature and the effective outlet water temperature;
and if the third difference is smaller than a first preset difference, judging that the water chiller in the effective closing state is in a pre-bypass state.
Optionally, determining an effective water outlet temperature according to the return water temperature and the water outlet temperature of the water chiller in the effective closing state includes:
calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state;
and comparing the fourth difference with a second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in the effective closing state as the effective outlet water temperature.
In a second aspect, an embodiment of the present invention further provides a device for determining bypass operation of a water chilling unit, including:
the state determining module is used for determining the effective states of at least two water coolers in the water chilling unit within preset effective time according to the switching state; wherein the active state comprises an active on state;
the first acquisition module is used for acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in the effective opening state;
the first calculation module is used for calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the total pipe outlet water temperature of the water chilling unit;
and the judging module is used for judging the bypass state of the water chilling unit according to the bypass flow ratio.
Optionally, the calculation module includes:
the first calculation unit is used for calculating a first difference value between the average return water temperature and the average outlet water temperature;
the second calculation unit is used for calculating a second difference value between the total pipe outlet water temperature and the average outlet water temperature;
and the third calculation unit is used for determining the bypass flow rate ratio according to the ratio of the first difference value and the second difference value.
Optionally, the valid state further includes a valid closed state, and the device for determining bypass operation of the water chilling unit further includes: the effective water outlet temperature determining module is used for determining the effective water outlet temperature according to the return water temperature and the water outlet temperature of the water chiller in the effective closing state;
the second calculation module is used for calculating a third difference value between the average return water temperature and the effective outlet water temperature;
and the second judgment module is used for judging that the water chiller in the closed state is in the pre-bypass state when the third difference is smaller than the first preset difference.
Optionally, the effective leaving water temperature determining module includes:
the fourth calculation unit is used for calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state;
and the comparison determining unit is used for comparing the fourth difference with a second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in the effective closing state as the effective outlet water temperature.
According to the technical scheme provided by the embodiment of the invention, whether the duration time of the water chilling unit in the current state exceeds the preset effective time is judged according to the switching state of the water chilling unit, so that the effective state of the water chilling unit is determined, the bypass flow ratio is calculated according to the average return water temperature and the average outlet water temperature of the water chilling unit in the effective opening state in the effective state and the outlet water temperature of a header pipe of the water chilling unit, the bypass flow ratio is represented by using the temperature parameter ratio, the severity of the bypass is reflected by using the bypass flow ratio, the bypass flow ratio is compared with the preset ratio, the bypass state of the water chilling unit can be judged by using quantitative data, and the diagnosis accuracy of the bypass state is improved. And the temperature data acquired by the cold water unit can avoid the condition that the cold water unit is additionally provided with equipment such as a flow meter and the like during erection, thereby reducing the diagnosis cost, avoiding the conditions of low efficiency and energy consumption of the cold machine caused by invalid bypass in operation, and simultaneously avoiding the safety problem of the cold water machine caused by insufficient flow of the cold water machine in an open state through bypass diagnosis.
Drawings
Fig. 1 is a schematic diagram of a method for determining bypass operation of a water chilling unit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an operation of a water chilling unit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of another method for determining bypass operation of a chiller according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of another method for determining bypass operation of a chiller according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a device for determining bypass operation of a chiller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a method for determining bypass operation of a chiller according to an embodiment of the present invention, where the method is applicable to a situation of diagnosis of bypass operation of a chiller, and the method may be executed by a diagnostic apparatus for bypass operation of a chiller, and the apparatus may be implemented in a hardware and/or software manner. The method specifically comprises the following steps:
s110, determining effective states of at least two water coolers in the water chiller according to the switching state; wherein the active state comprises an active on state.
Specifically, the switching state refers to switching the water chiller from an open state to a closed state or switching the water chiller from the closed state to the open state. If the whole water chilling unit keeps the current state for more than the preset effective time, the state is called an effective state, wherein each state switching represents the end of the previous state and the start of the current state. Exemplarily, table 1 is a schematic diagram of the duration of the switching state, referring to table 1, the preset valid time is set to be 60 minutes, and the current state duration of the chiller unit exceeds 60 minutes and is considered to be the valid state, assuming that the chiller unit includes four chillers, the initial states of the chiller units are all off, the state of the first chiller is switched to be on, and in 9 am: 00 to 10: and the duration time of the opening state of the first water cooler is 30 minutes in 30 time periods, and the first water cooler is in an invalid state because the duration time is less than the preset valid time of 60 minutes. At a ratio of 10:30 to 11: and in the period of 00, the state of the second water chiller is switched to an open state at the ratio of 10:30, the duration of the open state of the first water chiller is 60 minutes, but at the moment, the duration of the current state of the water chiller needs to be counted again because one water chiller is additionally opened, namely the water chiller enters a new state, the duration is 30 minutes, and the water chiller is in an invalid state because the duration is less than the preset effective time of 60 minutes. At a ratio of 11:00 to 18: in the period of 00, the first water chiller is switched from an open state to a closed state at the speed of 11:00, if no new water chiller is opened or closed in the whole period of time, the duration is 360 minutes and exceeds the preset effective time by 60 minutes, and therefore the water chiller in the state is in an effective state. The opening state of the second water chiller is an effective opening state.
TABLE 1 is a schematic diagram of duration of switching states
And S120, acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in an effective opening state.
The return water temperature and the outlet water temperature of the water cooler in the effective opening state can be measured for multiple times, averaged values can be obtained, measurement errors of the return water temperature and the outlet water temperature are reduced, the return water temperature and the outlet water temperature of the water cooler are measured in a sub-precision mode, for example, the return water temperature and the outlet water temperature are measured every 15 minutes, and the measured temperature values are averaged respectively to serve as the return water temperature and the outlet water temperature of the water cooler in the effective opening state. When the number of the water coolers is one in the effective opening state, the return water temperature of the water coolers in the effective opening state can be used as the average return water temperature, and the water outlet temperature of the water coolers in the effective opening state can be used as the average water outlet temperature. When the number of the water coolers in the effective opening state is multiple, for example, the number of the water coolers in the effective opening state is two, the return water temperature of the first water cooler and the return water temperature of the second water cooler are summed and then divided by the number of the water coolers, the calculated average value is used as the average return water temperature of the water coolers in the effective opening state, similarly, the outlet water temperature of the first water cooler and the outlet water temperature of the second water cooler are summed and then divided by the number of the water coolers, and the calculated average value is used as the average return water temperature of the water coolers in the effective opening state. The outlet water temperature of the main pipe of the water chilling unit is the outlet water temperature of the main pipe where the water chilling machine pipes are intersected.
130. Calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature and the outlet water temperature of a main pipe of the water chilling unit;
specifically, the bypass flow ratio is reflected by utilizing the temperature parameter ratio according to the average return water temperature, the average outlet water temperature and the main pipe outlet water temperature of the water chilling unit, when the closed water chilling unit is bypassed, the return water of the water chilling unit flows out directly through the outlet water of the water chilling unit, and the outlet water temperature of the main pipe is influenced inevitably because the return water temperature is higher than the outlet water temperature. The bypass flow rate ratio may use a temperature ratio to reflect the severity of the bypass.
And S140, judging the bypass state of the water chilling unit according to the bypass flow ratio.
Specifically, the bypass state of the water chilling unit is reflected by the bypass flow ratio, and then the bypass state of the water chilling unit is judged. The preset proportion can be obtained and set through engineering experience, the preset proportion is usually set to be 10%, and when the bypass flow proportion exceeds 10%, the water chilling unit can be judged to be in a bypass state.
According to the technical scheme provided by the embodiment of the invention, whether the duration time of the water chilling unit in the current state exceeds the preset effective time is judged according to the switching state of the water chilling unit, so that the effective state of the water chilling unit is determined, the bypass flow ratio is calculated according to the average return water temperature and the average outlet water temperature of the water chilling unit in the effective opening state in the effective state and the outlet water temperature of a header pipe of the water chilling unit, the bypass flow ratio is represented by using the temperature parameter ratio, the severity of the bypass is reflected by using the bypass flow ratio, the bypass flow ratio is compared with the preset ratio, the bypass state of the water chilling unit can be judged by using quantitative data, and the diagnosis accuracy of the bypass state is improved. And the temperature data acquired by the cold water unit can avoid the condition that the cold water unit is additionally provided with equipment such as a flow meter and the like during erection, thereby reducing the diagnosis cost, avoiding the conditions of low efficiency and energy consumption of the cold machine caused by invalid bypass in operation, and simultaneously avoiding the safety problem of the cold water machine caused by insufficient flow of the cold water machine in an open state through bypass diagnosis.
Based on the above embodiment, optionally, calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature, and the header outlet water temperature of the chiller includes:
a first difference between the average return water temperature and the average exit water temperature is calculated.
A second difference between the mains outlet water temperature and the average outlet water temperature is calculated.
And determining the bypass flow ratio according to the ratio of the first difference value and the second difference value.
Specifically, fig. 2 is a schematic structural diagram of operation of a water chiller according to an embodiment of the present invention, and referring to fig. 2, it is assumed that two water chillers in effective open states are provided, the outlet water temperature of the first water chiller 210 in the effective open state is represented by t11, the outlet water temperature of the second water chiller 220 in the effective open state is represented by t12, and the average outlet water temperature t1 is obtained by summing the outlet water temperature t11 of the first water chiller 210 in the effective open state and the outlet water temperature t12 of the second water chiller 220 in the effective open state and averaging the sum. The average return water temperature t2 is obtained by summing the return water temperature t21 of the first water chiller 210 in the effective opening state and the return water temperature t22 of the second water chiller 220 in the effective opening state and averaging the sum.
And (3) obtaining a first difference value by taking the difference between the average return water temperature t2 and the average outlet water temperature t1, and obtaining a second difference value by taking the difference between the total pipe outlet water temperature t3 and the average outlet water temperature t 1. The bypass flow rate ratio is a second difference/first difference, and is represented by a ratio of the second difference to the first difference. Ideally, if there is no bypass operation for the third chiller 230 and the fourth chiller 240, the average leaving water temperature t1 should be equal to the header leaving water temperature t3 and the bypass flow ratio should be close to 0. In the practical engineering application, the ideal situation can not be achieved, so a preset ratio is set according to the engineering application, and if the bypass flow ratio is larger than the preset ratio, the condition that the bypass operation exists in the water chiller is judged.
Based on the above embodiment, optionally, determining the bypass state of the chiller according to the bypass flow ratio includes:
and comparing the bypass flow ratio with a preset ratio, and if the bypass flow ratio is greater than the preset ratio and the time greater than the state exceeds the preset time, determining that the water chilling unit is in bypass operation.
Specifically, in practical engineering application, because the influence of slow temperature change caused by switching of the water chiller cannot reach an ideal condition generally, a preset ratio is set according to engineering application, and a preset time is set at the same time, if the bypass flow ratio is greater than the preset ratio, and the time greater than the state exceeds the preset time, the condition that the water chiller is in bypass operation is judged. For example, the preset ratio is set to 10%, if the calculated bypass flow ratio is greater than 10% and the greater-than-state lasts for more than 60 minutes, the influence of slow temperature change caused by switching of the water chiller can be eliminated, and therefore it is further determined that the water chiller bypass operation exists. By adding the preset time limit condition, the misjudgment of bypass operation within a certain time caused by the change of the valve after the switching state of the water cooler and the measured temperature error are avoided, and the accuracy of bypass operation diagnosis is further improved.
Optionally, when the water chiller includes the main water chiller and the auxiliary water chiller in the effective open state, acquiring the average outlet water temperature of the water chiller in the open state includes:
and calculating an average value according to the outlet water temperature of the main water cooler, and taking the average value as the average outlet water temperature of the water cooler in an effective opening state.
For example, the main water chiller and the auxiliary water chiller may be defined according to the outlet water flow or the rated power, if the water chiller in the effective open state includes only the main water chiller, the average outlet water temperature of the water chiller in the open state is only calculated as the average outlet water temperature of each main water chiller, and if the water chiller in the effective open state includes the main water chiller and the auxiliary water chiller, the average outlet water temperature of each main water chiller is calculated as the average outlet water temperature of the water chiller in the open state. The influence of small water outlet or return water temperature of the auxiliary water cooler is ignored, and large calculation deviation generated after data averaging is avoided.
Fig. 3 is a schematic diagram of another method for determining bypass operation of a chiller according to an embodiment of the present invention, referring to fig. 3, the method includes:
and S310, determining the effective states of at least two water coolers in the water chiller according to the switching state. Wherein the active state comprises an active on state.
S320, acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in an effective opening state.
S330, determining the effective water outlet temperature according to the water return temperature and the water outlet temperature of the water cooler in the effective closing state.
Specifically, the active state also includes an active off state, illustratively, continuing with table 1 at 11:00 to 18: in the period of 00, the first water chiller is switched from an open state to a closed state at the speed of 11:00, if no new water chiller is opened or closed in the whole period of time, the duration is 360 minutes and exceeds the preset effective time by 60 minutes, and therefore the water chiller in the state is in an effective state. The opening state of the second water chiller is an effective opening state. And the closing states of the first water chiller, the third water chiller and the fourth water chiller are effective closing states. Illustratively, the water coolers with the possible bypasses are screened out according to the return water temperature and the outlet water temperature of the water coolers in the effective closing state, and the return water temperature of the water coolers in the effective closing state with the possible bypass operation is used as the effective outlet water temperature. The return water temperature and the outlet water temperature of the water cooler in the effective closing state are measured accurately, for example, every 15 minutes, and the measured temperature values are respectively averaged to be used as the return water temperature and the outlet water temperature of the water cooler in the effective closing state.
S340, calculating a third difference value between the average return water temperature and the effective outlet water temperature.
Specifically, the absolute value of the difference between the average return water temperature and the effective outlet water temperature is used as a third difference value.
And S350, if the third difference is smaller than the first preset difference, judging that the water chiller in the effective closing state is in the pre-bypass state.
For example, the first preset difference is set to 0.3 ℃, and if the third difference is less than 0.3 ℃, the water chiller in the effective closing state can be judged to be in the pre-bypass state. That is, the average return water temperature is not much different from the outlet water temperature of the water chiller in the effectively closed state, that is, the return water flows out from the outlet port through the water chiller in the closed state. Therefore, the water chiller in the effective closing state is judged to be in the pre-bypass state.
And S360, calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the outlet water temperature of the main pipe of the water chilling unit.
And S370, judging the bypass state of the water chilling unit according to the bypass flow ratio.
Specifically, the bypass flow rate ratio is compared with a preset ratio, and the bypass state of the water chilling unit can be judged through quantitative data. Illustratively, the preset ratio is set to 10%, when the water chiller in an effectively closed state is in a pre-bypass state, if the bypass flow ratio exceeds the preset ratio of 10%, the water chiller can be judged to be in a bypass state, and the serial number of the water chiller in bypass operation can be accurately output, so that specific positioning is determined, and checking and maintenance are facilitated.
Optionally, the effective water outlet temperature is determined according to the return water temperature and the water outlet temperature of the water chiller in the effective closing state, and the method comprises the following steps:
and calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state.
And comparing the fourth difference with the second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in an effective closing state as the effective outlet water temperature.
Specifically, after the states of the water coolers are switched, if the valves are all closed and do not have bypass operation, a fourth difference value, namely a temperature difference, is larger between the return water temperature and the outlet water temperature of the water cooler in the effective closing state at the moment, and the outlet water temperature of the water cooler can be considered as an invalid outlet water temperature. After the states of the water coolers are switched, if bypass operation exists, the difference between the return water temperature and the outlet water temperature of the water cooler in the effective closing state at the moment is smaller, for example, the second preset difference is set to be 0.3 ℃, if the fourth difference is smaller than 0.3 ℃, the outlet water temperature of the water cooler is taken as the effective outlet water temperature, which is equivalent to preliminary screening of the water cooler in the effective closing state, and the water coolers possibly having the bypass operation are screened.
Fig. 4 is a schematic diagram of another method for determining bypass operation of a chiller according to an embodiment of the present invention, referring to fig. 4, the method includes:
after the judgment of the bypass operation of the water chilling unit is started, step S410 is executed to determine the effective state of the water chilling unit according to the switching state of the water chilling unit, and the state with the duration time of the current state exceeding 60 minutes is taken as the effective state. Step S420 obtains the average return water temperature of the water chiller in the effective open state. Step S430 obtains the return water temperature and the outlet water temperature of the water chiller in the effectively closed state. Step S440 determines whether a temperature difference between the return water temperature and the outlet water temperature of the water chiller in the effectively closed state, i.e., a fourth difference, is smaller than a second preset difference, which is set to 0.3 ℃. If the temperature difference is greater than the second preset difference, the invalid data is deleted, and step S440 is executed to determine the water chiller in the next valid shutdown state. If the temperature difference is smaller than the second preset difference, step S450 is executed to use the outlet water temperature of the water chiller in the effective closing state as the effective outlet water temperature. Step S460 determines a relationship between a temperature difference between the average return water temperature and the effective outlet water temperature of the water chiller in the effective open state, that is, a third difference, and a first preset difference, where the first preset difference is set to 0.3 ℃, for example, if the temperature difference is greater than the first preset difference, the invalid data is deleted, and if the temperature difference is less than the first preset difference, step S470 is executed to calculate a bypass flow ratio according to the average return water temperature, the average outlet water temperature, and a header outlet water temperature of the water chiller. Step S480 determines whether the bypass flow ratio is greater than the preset ratio, if the bypass flow ratio is greater than the preset ratio, the preset ratio is exemplarily set to 10%, if the bypass flow ratio is greater than the preset ratio, step S490 is performed to determine whether the duration of the state where the bypass flow ratio is greater than the preset ratio exceeds a preset time, the preset time is exemplarily set to 60 minutes, and if the duration of the state where the bypass flow ratio is greater than the preset ratio is greater than 60 minutes, it is determined that the bypass operation of the cold water machine exists. And step S480, if the bypass flow ratio is less than the preset ratio, deleting the data as invalid data. In step S490, if the duration of the state where the bypass flow ratio is greater than the preset ratio is less than the preset time, the state is deleted as invalid data.
Fig. 5 is a schematic structural diagram of a device for determining bypass operation of a water chilling unit according to an embodiment of the present invention, and referring to fig. 5, the device includes:
and a state determining module 510, configured to determine, according to the switching state, effective states of at least two water coolers in the water chiller unit within a preset effective time. Wherein the active state comprises an active on state.
The first obtaining module 520 is configured to obtain an average return water temperature and an average outlet water temperature of the water chiller and a header pipe outlet water temperature of the water chiller in an effective on state.
And the first calculating module 530 is used for calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the outlet water temperature of the main pipe of the water chilling unit.
And the judging module 540 is used for judging the bypass state of the water chilling unit according to the bypass flow ratio.
According to the technical scheme provided by the embodiment of the invention, the state determination module is used for determining whether the duration time of the water chilling unit in the current state exceeds the preset effective time or not according to the switching state of the water chilling unit so as to determine the effective state of the water chilling unit, the first acquisition module is used for acquiring the average return water temperature and the average outlet water temperature of the water chilling unit in the effective opening state and the main pipe outlet water temperature of the water chilling unit, the first calculation module is used for calculating the bypass flow ratio, the temperature parameter ratio is used for representing the bypass flow ratio, the bypass severity is reflected by the bypass flow ratio, the judgment module is used for comparing the bypass flow ratio with the preset ratio, the bypass state of the water chilling unit can be judged through quantitative data, and the diagnosis accuracy of the bypass state is improved. And the temperature data acquired by the cold water unit can avoid the condition that the cold water unit is additionally provided with equipment such as a flow meter and the like during erection, thereby reducing the diagnosis cost, avoiding the conditions of low efficiency and energy consumption of the cold machine caused by invalid bypass in operation, and simultaneously avoiding the safety problem of the cold water machine caused by insufficient flow of the cold water machine in an open state through bypass diagnosis.
Optionally, the calculation module includes:
the first calculating unit is used for calculating a first difference value between the average return water temperature and the average outlet water temperature.
And the second calculating unit is used for calculating a second difference value between the total pipe outlet water temperature and the average outlet water temperature.
And the third calculation unit is used for determining the bypass flow rate ratio according to the ratio of the first difference and the second difference.
Optionally, the effective state further includes an effective closing state, and the determination device for bypass operation of the water chilling unit further includes: and the effective water outlet temperature determining module is used for determining the effective water outlet temperature according to the return water temperature and the water outlet temperature of the water cooler in the effective closing state.
And the second calculation module is used for calculating a third difference value between the average return water temperature and the effective outlet water temperature.
And the second judgment module is used for judging that the water chiller in the closed state is in the pre-bypass state when the third difference value is smaller than the first preset difference value.
Optionally, the effective leaving water temperature determining module includes:
and the fourth calculating unit is used for calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state.
And the comparison determining unit is used for comparing the fourth difference with the second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in an effective closing state as the effective outlet water temperature.
The device for judging the bypass operation of the water chilling unit provided by the embodiment of the invention and the method for judging the bypass operation of the water chilling unit provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the method for judging the bypass operation of the water chilling unit provided by any embodiment of the invention.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for judging bypass operation of a water chilling unit is characterized by comprising the following steps:
determining the effective states of at least two water coolers in the water chiller unit within preset effective time according to the switching state; wherein the active state comprises an active on state;
acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in the effective opening state;
calculating a bypass flow ratio according to the average return water temperature, the average outlet water temperature and the total pipe outlet water temperature of the water chilling unit;
and judging the bypass state of the water chilling unit according to the bypass flow ratio.
2. The method for judging the bypass operation of the water chilling unit according to claim 1, wherein calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the main pipe outlet water temperature of the water chilling unit comprises:
calculating a first difference value between the average backwater temperature and the average water outlet temperature;
calculating a second difference value between the total pipe water outlet temperature and the average water outlet temperature;
and determining the bypass flow ratio according to the ratio of the first difference value to the second difference value.
3. The method for judging the bypass operation of the water chilling unit according to claim 1, wherein judging the bypass state of the water chilling unit according to the bypass flow ratio comprises:
and comparing the bypass flow ratio with a preset ratio, and if the bypass flow ratio is greater than the preset ratio and the time greater than the state exceeds the preset time, determining that the water chilling unit is in bypass operation.
4. The method for judging the bypass operation of the water chilling unit according to claim 1, wherein when the water chiller in the effective opening state includes a main water chiller and an auxiliary water chiller, acquiring the average outlet water temperature of the water chilling unit in the opening state includes:
and calculating an average value according to the outlet water temperature of the main water cooler, and taking the average value as the average outlet water temperature of the water cooler in the effective opening state.
5. The method for judging the bypass operation of the water chilling unit according to any one of claims 1-4, wherein the effective state further comprises an effective closing state, and before calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the header outlet water temperature of the water chilling unit, the method comprises the following steps:
determining an effective water outlet temperature according to the return water temperature and the water outlet temperature of the water cooler in the effective closing state;
calculating a third difference value between the average return water temperature and the effective outlet water temperature;
and if the third difference is smaller than a first preset difference, judging that the water chiller in the effective closing state is in a pre-bypass state.
6. The method for determining bypass operation of a chiller according to claim 5, wherein determining an effective outlet water temperature from the return water temperature and the outlet water temperature of the chiller in the effectively closed state comprises:
calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state;
and comparing the fourth difference with a second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in the effective closing state as the effective outlet water temperature.
7. The utility model provides a judgement device of cooling water set bypass operation which characterized in that includes:
the state determining module is used for determining the effective states of at least two water coolers in the water chilling unit within preset effective time according to the switching state; wherein the active state comprises an active on state;
the first acquisition module is used for acquiring the average return water temperature and the average outlet water temperature of the water chiller and the outlet water temperature of a header pipe of the water chiller in the effective opening state;
the first calculation module is used for calculating the bypass flow ratio according to the average return water temperature, the average outlet water temperature and the total pipe outlet water temperature of the water chilling unit;
and the judging module is used for judging the bypass state of the water chilling unit according to the bypass flow ratio.
8. The apparatus for determining bypass operation of a chiller according to claim 7 wherein said computing module comprises:
the first calculation unit is used for calculating a first difference value between the average return water temperature and the average outlet water temperature;
the second calculation unit is used for calculating a second difference value between the total pipe outlet water temperature and the average outlet water temperature;
and the third calculation unit is used for determining the bypass flow rate ratio according to the ratio of the first difference value and the second difference value.
9. The apparatus for determining bypass operation of a chiller according to claim 7, wherein said active state further comprises an active off state, said apparatus for determining bypass operation of a chiller further comprising:
the effective water outlet temperature determining module is used for determining the effective water outlet temperature according to the return water temperature and the water outlet temperature of the water chiller in the effective closing state;
the second calculation module is used for calculating a third difference value between the average return water temperature and the effective outlet water temperature;
and the second judgment module is used for judging that the water chiller in the closed state is in the pre-bypass state when the third difference is smaller than the first preset difference.
10. The apparatus for determining bypass operation of a chiller according to claim 9 wherein said effective leaving water temperature determining module comprises:
the fourth calculation unit is used for calculating a fourth difference value according to the return water temperature and the outlet water temperature of the water cooler in the effective closing state;
and the comparison determining unit is used for comparing the fourth difference with a second preset difference, and if the fourth difference is smaller than the second preset difference, determining the outlet water temperature of the water chiller in the effective closing state as the effective outlet water temperature.
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