CN113739358A - Energy-saving control method and system for cold machine - Google Patents
Energy-saving control method and system for cold machine Download PDFInfo
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- CN113739358A CN113739358A CN202111015115.4A CN202111015115A CN113739358A CN 113739358 A CN113739358 A CN 113739358A CN 202111015115 A CN202111015115 A CN 202111015115A CN 113739358 A CN113739358 A CN 113739358A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 264
- 238000004134 energy conservation Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 51
- 230000008014 freezing Effects 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 11
- 238000009529 body temperature measurement Methods 0.000 claims description 9
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The invention provides a method and a system for controlling energy conservation of a refrigerator, wherein the method comprises the following steps: acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating a difference value between the current set value and the current actual measured value; judging whether to adjust the current set value according to the error value of the chilled water of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged; if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value; wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water. According to the invention, the water temperature correction value of the chilled water is calculated through the operation parameters of the refrigerator, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
Description
Technical Field
The invention relates to the technical field of control of a central air conditioner cooler, in particular to a method and a system for controlling energy conservation of a cooler.
Background
The performance of a cooler in a refrigeration system of a central air conditioner can be reduced along with the use time, and the performance can be expressed as follows: the difference between the set value of the chilled water temperature of the chiller and the actual measured value of the chilled water temperature of the chiller is greater than an error value, for example: the set value of the chilled water temperature of the refrigerator is 7 ℃, the error value is 1 ℃, the actual measured value of the chilled water temperature of the refrigerator is 5 ℃, at the moment, the difference value between the actual measured value and the set value is larger than the error value, and the set value of the chilled water temperature of the refrigerator needs to be corrected to meet the condition that the difference value between the set value and the actual measured value is within the allowable error range.
In order to solve the problems, the prior art usually corrects the set value of the chilled water of the refrigerator through the experience of engineers or historical data of chilled water temperature adjustment, but the method provided by the prior art needs to repeatedly adjust the set value by a large amount of manpower or historical data to achieve expectation, has high cost and causes serious energy waste.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for controlling energy conservation of a refrigerator.
The invention provides a cold machine energy-saving control method in a first aspect, which comprises the following steps:
acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating a difference value between the current set value and the current actual measured value;
judging whether to adjust the current set value according to the error value of the chilled water of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged;
if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value;
wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
Further, the calculating of the water temperature correction value according to the cold machine operation parameter includes:
judging whether the running time of the refrigerator is less than a preset running time or not;
if so, taking the current set value as the water temperature correction value;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating the water temperature correction value according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
Further, the condition for lowering the current setting value is as follows: the current set value is smaller than the current actual measurement value;
the conditions for improving the current set value are as follows: the current set value is greater than the current actual measured value.
Further, the calculating of the water temperature correction value according to the adjustment condition includes:
if the current set value and the current actual measured value meet the condition of reducing the current set value, the water temperature correction value is equal to the current actual measured value minus a first correction reference value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, the water temperature correction value is equal to the current actual measured value plus a first correction reference value.
Further, the calculating of the water temperature correction value according to the adjustment condition includes:
if the current set value and the current actual measured value meet the condition of reducing the current set value, taking the minimum value of the set range interval as a water temperature correction value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, taking the maximum value of the set range interval as a water temperature correction value.
Further, after the water temperature correction value is calculated according to the cold machine operation parameter, the method further includes:
and adjusting the set range interval of the temperature of the chilled water according to a water temperature dynamic adjustment strategy.
Further, the adjusting the set range interval of the chilled water temperature according to the water temperature dynamic adjustment strategy includes:
obtaining a cold machine freezing water flow, a freezing water inlet temperature measured value and a freezing water outlet temperature measured value of a cold machine;
calculating the actual load rate of the refrigerator according to the chilled water flow, the chilled water inlet temperature measurement value and the chilled water outlet temperature measurement value of the refrigerator;
judging whether the actual load rate of the refrigerator meets a preset load rate range or not; if so, keeping the set range interval of the chilled water temperature unchanged;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating a correction range interval according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
Further, the calculating a correction range interval according to the adjustment condition includes:
if the current set value and the current actual measurement value meet the condition of reducing the current set value, the maximum value of the correction range interval is equal to the maximum value of the set range interval minus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the set range interval minus the second correction reference value;
if the current setting value and the current actual measurement value meet the condition of improving the current setting value, the maximum value of the correction range interval is equal to the maximum value of the setting range interval plus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the setting range interval plus the second correction reference value.
Further, the determining whether to adjust the current setting value according to the chilled water error value of the chiller and the difference value includes:
if the difference value is smaller than the chilled water error value, the current set value does not need to be adjusted;
if the difference is greater than the chilled water error value, the current set value needs to be adjusted.
A second aspect of the present invention provides a chiller energy-saving control system, including:
the difference value calculation module is used for acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating the difference value between the current set value and the current actual measured value;
the chilled water temperature adjusting and judging module is used for judging whether to adjust the current set value according to the chilled water error value of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged; if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value;
wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the invention provides a method and a system for controlling energy conservation of a refrigerator, wherein the method comprises the following steps: acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating a difference value between the current set value and the current actual measured value; judging whether to adjust the current set value according to the error value of the chilled water of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged; if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value; wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water. According to the invention, the water temperature correction value of the chilled water is calculated through the operation parameters of the refrigerator, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a refrigerator energy saving control model according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling energy saving of a chiller according to an embodiment of the present invention;
fig. 3 is a device diagram of a chiller energy saving control system according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
A first aspect.
Referring to fig. 1, an embodiment of the present invention provides a refrigerator energy saving control model, where the control model includes: a cloud refrigerator control system 100 and a refrigerator group 200 consisting of a plurality of refrigerators; wherein the chiller train comprises: the first cooler, the second cooler and the third cooler are connected with the N-th cooler.
The cloud refrigerator control system 100 is configured to control all refrigerators in the refrigerator group 200, and the control mode is wireless transmission control, including but not limited to: a WIFI, BT, zigbee or NB-IoT network.
Referring to fig. 1 and 2, in embodiment 1 of the present invention, the cloud-side chiller control system 100 executes a chiller energy saving control method, where the method includes:
and S10, acquiring a current set value and a current actual measurement value of the chilled water temperature every other preset time period, and calculating a difference value between the current set value and the current actual measurement value.
It should be noted that the preset time period is a time period preset manually, and may be 30s (second), 1min (minute), 5min, 10min, and the like; and the preset time period can be adjusted at any time according to the requirement. The current set value of the chilled water temperature is stored in the cloud refrigerator control system 100. And if the difference value between the current set value and the current actual measurement value is a negative number, taking the absolute value of the difference value.
It can be understood that the cloud refrigerator control system 100 obtains the current actual measurement value of the chilled water temperature sensor of the refrigerator every preset time period. Specifically, the cloud chiller control system 100 sends an instruction for reading data of the chilled water temperature sensor to each chiller in the chiller group 200, and after each chiller in the chiller group 200 receives the instruction for reading the data of the chilled water temperature sensor, a data reading function is triggered to obtain a current actual measurement value of the chilled water temperature sensor, and the read current actual measurement value is sent to the cloud chiller control system 100. The cloud refrigerator control system 100 performs mathematical operation according to the current set value of the chilled water temperature and the current actual measurement value to obtain a difference value between the current set value and the current actual measurement value.
For example, the following steps are carried out: the cloud refrigerator control system 100 acquires the current actual measurement value of the chilled water temperature sensor of the refrigerator every 5 minutes. Specifically, the cloud chiller control system 100 sends an instruction for reading chilled water temperature sensor data to each chiller (a first chiller, a second chiller, a third chiller · an nth chiller) in the chiller group 200, and when the first chiller receives the instruction for reading the chilled water temperature sensor data, a data reading function is triggered, a current actual measurement value of the chilled water temperature sensor is obtained to be 12 ℃, and the obtained previous actual measurement value is sent to the cloud chiller control system 100. The current set value of the first chiller prestored in the cloud chiller control system 100 is 10 ℃. Performing mathematical operation according to a current set value (10 ℃) of the chilled water temperature of the first cooler and the current actual measured value (12 ℃) to obtain that the difference value between the current set value and the current actual measured value is 2 ℃.
And S20, judging whether to adjust the current set value according to the chilled water error value of the refrigerator and the difference value.
It should be noted that the error value of the chilled water of the refrigerator is preset manually and stored in the cloud refrigerator control system 100, and may be 0.8 ℃ (celsius), 1 ℃, 1.2 ℃, 1.4 ℃, and the error value of the chilled water may be adjusted at any time as needed.
It can be understood that the cloud refrigerator control system 100 determines whether to adjust the current setting value according to the chilled water error value of the refrigerator and the difference value. Specifically, the cloud refrigerator control system 100 compares the chilled water error value with the calculated magnitude relationship between the difference between the current set value and the current actual measurement value, and determines whether to adjust the current set value according to the magnitude relationship obtained by the comparison.
And S31, if not, keeping the current set value of the chilled water temperature unchanged.
It can be understood that, when the difference between the calculated current set value and the current actual measurement value satisfies the chilled water error value, the current set value of the chilled water temperature is kept unchanged.
And S32, if yes, obtaining the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value.
Wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
It can be understood that, when the difference between the calculated current set value and the current actual measurement value does not satisfy the chilled water error value, the set value of the chilled water temperature needs to be adjusted, and the chilled water temperature obtained after adjustment is defined as a water temperature correction value. Specifically, the water temperature correction value is obtained by calculating a cold machine operation parameter, and the cold machine is controlled to operate according to the water temperature correction value.
For example, the chilled water error value is 1 ℃, the difference between the current set value and the current actual measured value of the first chiller is calculated to be 2 ℃, and whether to adjust the current set value is judged according to the chilled water error value (1 ℃) and the difference (2 ℃) of the chillers. Specifically, the cloud refrigerator control system 100 compares the chilled water error value (1 ℃) with the calculated magnitude relationship of the difference (2 ℃) between the current set value and the current actual measurement value, and determines that the current set value needs to be adjusted according to the magnitude relationship obtained by the comparison, wherein the difference (2 ℃) is greater than the chilled water error value (1 ℃).
The cold machine energy-saving control method provided by the specific embodiment 1 of the invention has the beneficial effects that:
according to the invention, the water temperature correction value of the chilled water is calculated through the operation parameters of the refrigerator, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
In embodiment 2 of the present invention, the calculating of the water temperature correction value based on the chiller operation parameter in step S32 includes:
and judging whether the running time of the cold machine is less than a preset running time or not.
And if so, taking the current set value as the water temperature correction value.
If not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating the water temperature correction value according to the adjustment condition.
Wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
It should be noted that the preset operation time is a time period preset manually, and may be 1min, 5min, 10min, and the like; and the preset operation time can be adjusted at any time according to the requirement.
It can be understood that when the cold machine is just started or the cold machine starting time is short, the difference value between the current set value of the chilled water temperature and the current actual measured value has no reference meaning, and the current set value is continuously kept to control the cold machine to operate. When the operation of the refrigerator meets enough time, the difference value between the current set value of the chilled water temperature and the current actual measured value has reference significance, so that when the difference value has reference significance and the current set value is judged to be adjusted, the water temperature correction value is calculated according to the adjustment condition.
For example, the preset operation time is 5min, the operation time of the first chiller obtained by the cloud chiller control system 100 is 8min, and the operation time of the second chiller is 3 min. The operation time of the first cooler is longer than the preset operation time by 5min, and the current set value of the first cooler and the set range interval are judged whether to meet the adjustment condition, and the water temperature correction value is calculated according to the adjustment condition; and because the operation time of the second cooler is less than 3min and less than the preset operation time and is 5min, the second cooler continuously keeps the current set value to control the operation of the cooler.
The cold machine energy-saving control method provided by the specific embodiment 2 of the invention has the beneficial effects that:
the invention takes the running time of the refrigerator as a consideration factor for judging whether the temperature value of the chilled water of the refrigerator needs to be adjusted, improves the reliability of the judgment condition, reduces the control cost of the refrigerator and reduces the energy waste.
In embodiment 3 of the present invention, the condition for lowering the current setting value is: the current set value is smaller than the current actual measurement value; the conditions for improving the current set value are as follows: the current set value is greater than the current actual measured value.
For example, the current set value of the first chiller is 10 ℃, the current actual measurement value is 12 ℃, the difference between the current set value and the current actual measurement value is 2 ℃, the chilled water error value of the first chiller is 1 ℃, the operation time of the first chiller is 8min, the preset operation time is 5min, since the difference (2 ℃) is greater than the chilled water error value (1 ℃), the operation time (8min) of the first chiller is greater than the preset operation time (5min), and the current set value (10 ℃) is less than the current actual measurement value (12 ℃), it can be known that the current set value of the first chiller and the current actual measurement value meet the condition of reducing the current set value, and the water temperature correction value is calculated according to the condition of reducing the current set value.
The current set value of the third cooler is 10 ℃, the current actual measurement value is 8 ℃, the difference value between the current set value and the current actual measurement value is 2 ℃, the chilled water error value of the third cooler is 1 ℃, the operation time of the third cooler is 20min, and the preset operation time is 5 min.
The cold machine energy-saving control method provided in the embodiment 3 of the present invention has the following beneficial effects:
according to the invention, the adjustment condition is explicitly explained, namely when the current set value is less than the current actual measurement value, the current set value is reduced; and when the current set value is larger than the current actual measured value, the current set value is increased, the control cost of the cold machine is reduced, and the energy waste is reduced.
In embodiment 4 of the present invention, the calculating of the water temperature correction value based on the chiller operation parameter in step S32 includes:
and if the current set value and the current actual measured value meet the condition of reducing the current set value, the water temperature correction value is equal to the current actual measured value minus a first correction reference value.
And if the current set value and the current actual measured value meet the condition of improving the current set value, the water temperature correction value is equal to the current actual measured value plus a first correction reference value.
It should be noted that the first correction reference value is a reference value preset manually, and may be 0.5 ℃, 1 ℃ or 1.5 ℃, and the first correction reference value may be adjusted at any time as needed.
It can be understood that, when the cloud refrigerator control system 100 determines the adjustment condition that the refrigerator satisfies according to the current set value of the refrigerator and the current actual measurement value, it is determined that the refrigerator satisfies the condition of lowering the current set value or the condition of raising the current set value; if the current set value and the current actual measured value meet the condition of reducing the current set value, the water temperature correction value is equal to the current actual measured value minus a first correction reference value; and if the current set value and the current actual measured value meet the condition of improving the current set value, the water temperature correction value is equal to the current actual measured value plus a first correction reference value.
For example, as in the example of embodiment 3, the first correction value is set to 1.5 ℃, and whether the current set value of the first chiller and the set range section satisfy the condition for lowering the current set value is determined, and the water temperature correction value is calculated based on the condition for lowering the current set value. Specifically, the corrected value of the water temperature of the first cooler is equal to the current actual measured value (12 ℃) minus a first corrected reference value (1.5 ℃), namely the corrected value of the water temperature of the first cooler is 10.5 ℃, and the operation of the cooler is controlled according to the corrected value of the water temperature (10.5 ℃).
And the current set value of the third cooler and the current actual measured value meet the condition of increasing the current set value, and the water temperature correction value is calculated according to the condition of increasing the current set value. Specifically, the water temperature correction value of the third cooler is equal to the current actual measured value (8 ℃) plus a first correction reference value (1.5 ℃), namely the water temperature correction value of the first cooler is 9.5 ℃, and the operation of the cooler is controlled according to the water temperature correction value (9.5 ℃).
The cold machine energy-saving control method provided in the embodiment 4 of the present invention has the following beneficial effects:
according to the invention, the water temperature correction value is obtained by calculating the current actual measurement value and the first correction reference value, and the operation of the cold machine is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the cold machine is reduced, and the energy waste is reduced.
In embodiment 5 of the present invention, the calculating of the water temperature correction value based on the chiller operation parameter in step S32 includes:
and if the current set value and the current actual measured value meet the condition of reducing the current set value, taking the minimum value of the set range interval as a water temperature correction value.
And if the current set value and the current actual measured value meet the condition of improving the current set value, taking the maximum value of the set range interval as the water temperature correction value.
It should be noted that the setting range interval is a reference value set in advance manually, and the current setting value is in the setting range interval, the setting range interval may be [7 ℃, 9 ℃, or [9 ℃, 12 ℃), and the setting range interval may be adjusted at any time as required.
It can be understood that, when the cloud refrigerator control system 100 determines the adjustment condition that the refrigerator satisfies according to the current set value of the refrigerator and the current actual measurement value, it is determined that the refrigerator satisfies the condition of lowering the current set value or the condition of raising the current set value; if the current set value and the current actual measured value meet the condition of reducing the current set value, taking the minimum value of the set range interval as a water temperature correction value; and if the current set value and the current actual measured value meet the condition of improving the current set value, taking the maximum value of the set range interval as the water temperature correction value.
For example, as in the example of embodiment 3, the setting range interval is [9 ℃, 12 ℃), and the current setting value of the first chiller and whether the setting range interval satisfy the condition for lowering the current setting value are calculated according to the condition for lowering the current setting value. Specifically, the water temperature correction value of the first cooler is equal to the minimum value of the set range interval, namely the water temperature correction value of the first cooler is 9 ℃, and the operation of the cooler is controlled according to the water temperature correction value (9 ℃).
And the current set value of the third cooler and the current actual measured value meet the condition of increasing the current set value, and the water temperature correction value is calculated according to the condition of increasing the current set value. Specifically, the water temperature correction value of the third cooler is equal to the maximum value of the set range interval, namely the water temperature correction value of the third cooler is 12 ℃, and the operation of the cooler is controlled according to the water temperature correction value (12 ℃).
The cold machine energy-saving control method provided in the embodiment 5 of the present invention has the following beneficial effects:
according to the invention, the end value of the set range interval is used as the water temperature correction value, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
In embodiment 6 of the present invention, after calculating the water temperature correction value based on the chiller operation parameter in step S32, the method further includes:
and adjusting the set range interval of the temperature of the chilled water according to a water temperature dynamic adjustment strategy.
Specifically, the adjusting the set range interval of the chilled water temperature according to the water temperature dynamic adjustment strategy includes:
and obtaining the cold machine freezing water flow, the chilled water inlet temperature measured value and the chilled water outlet temperature measured value of the cold machine.
And calculating the actual load rate of the refrigerator according to the flow rate of the chilled water of the refrigerator, the measured value of the inlet water temperature of the chilled water and the measured value of the outlet water temperature of the chilled water.
And judging whether the actual load rate of the cold machine meets a preset load rate range.
If so, keeping the set range interval of the chilled water temperature unchanged.
If not, judging whether the current set value and the set range interval meet the adjustment condition, and calculating a correction range interval according to the adjustment condition.
Wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
It should be noted that the cold machine operation energy efficiency ratio is calculated by the following formula:
the COP is the energy efficiency ratio of the operation of the cold machine, the refrigerating capacity of the cold machine and the W is the power consumption of the operation of the cold machine;
the refrigerating capacity of the refrigerator is calculated by the following formula:
wherein Q is refrigerating capacity of the refrigerator, cpSpecific heat capacity of water, G cold machine freezing water flow and rho coldFrozen water density, tinIs a measured value of the inlet water temperature of the chilled water, toutIs a chilled water outlet water temperature measurement value.
It should be noted that the cold machine operation energy efficiency ratio includes, but is not limited to, the above calculation method, and other cold machine operation energy efficiency ratio calculation methods in the art may be used in the cold machine operation energy efficiency ratio calculation method in the above cold machine energy saving method.
The load rate range can be [ 50%, 90% ] according to the reference value manually preset in the preset load rate range, and the set range interval can be adjusted at any time according to the requirement.
It can be understood that, when the cloud-side refrigerator control system 100 calculates the actual load rate of the refrigerator according to the chilled water flow, the chilled water inlet temperature measurement value and the chilled water outlet temperature measurement value of the refrigerator, and determines whether the actual load rate of the refrigerator meets a preset load rate range; if the preset load rate range is met, keeping the set range interval of the chilled water temperature unchanged; and if the current set value does not meet the preset load rate range, judging whether the current set value and the current actual measurement value meet an adjustment condition, and calculating a correction range interval according to the adjustment condition.
For example, in the example of embodiment 3, the load rate range of the chiller is set to [ 50%, 90% ], the actual load rate of the first chiller is calculated to be 92%, the actual load rate (92%) of the first chiller exceeds the load rate range of the chiller by [ 50%, 90% ], it is determined that the current set value (10 ℃) and the current actual measurement value (12 ℃) of the first chiller satisfy the adjustment condition, and the correction range section is calculated according to the adjustment condition.
The cold machine energy saving control method provided in the embodiment 6 of the present invention has the following beneficial effects:
the invention takes the load rate of the refrigerator as a consideration factor for judging whether the temperature value of the chilled water of the refrigerator needs to be adjusted, improves the reliability of the judgment condition, reduces the control cost of the refrigerator and reduces the energy waste.
In a preferred embodiment of embodiment 6 of the present invention, the calculating a correction range section according to the adjustment condition includes:
if the current set value and the current actual measurement value meet the condition of reducing the current set value, the maximum value of the correction range interval is equal to the maximum value of the set range interval minus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the set range interval minus the second correction reference value;
if the current setting value and the current actual measurement value meet the condition of improving the current setting value, the maximum value of the correction range interval is equal to the maximum value of the setting range interval plus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the setting range interval plus the second correction reference value.
It should be noted that the second correction reference value is a reference value preset manually, and may be 0.1 ℃, 0.3 ℃ or 0.5 ℃, and the second correction reference value may be adjusted at any time as needed.
It can be understood that the cloud refrigerator control system 100 calculates a correction range interval according to the adjustment condition; if the current set value and the current actual measurement value meet the condition of reducing the current set value, the maximum value of the correction range interval is equal to the maximum value of the set range interval minus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the set range interval minus the second correction reference value; if the current setting value and the current actual measurement value meet the condition of improving the current setting value, the maximum value of the correction range interval is equal to the maximum value of the setting range interval plus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the setting range interval plus the second correction reference value.
For example, in the example of embodiment 5, the second correction reference value is 0.3 ℃, the setting range interval is [9 ℃, 12 ℃), the current setting value of the first chiller and whether or not the setting range interval satisfies the condition of lowering the current setting value, the maximum value of the correction range interval is equal to the maximum value (12 ℃) minus the second correction reference value (0.3 ℃), i.e., the maximum value of the correction range interval is 11.7 ℃, the minimum value of the correction range interval is equal to the minimum value (9 ℃) minus the second correction reference value (0.3 ℃), i.e., the maximum value of the correction range interval is 8.7 ℃, the minimum value (8.7 ℃) of the correction range interval is used as the water temperature correction value, and the chiller operation is controlled according to the water temperature correction value (8.7 ℃).
The current set value and the current actual measurement value of the third cooler meet the condition of improving the current set value, the maximum value of the correction range interval is equal to the maximum value (12 ℃) of the set range interval plus a second correction reference value (0.3 ℃), namely the maximum value of the correction range interval is 12.3 ℃, the minimum value of the correction range interval is equal to the minimum value (9 ℃) of the set range interval plus the second correction reference value (0.3 ℃), namely the maximum value of the correction range interval is 9.3 ℃.
In a preferred embodiment of embodiment 6 of the present invention, the method for controlling energy saving of a chiller has the following beneficial effects:
according to the invention, the end value of the set range interval is corrected, and the operation of the refrigerator is controlled according to the water temperature correction value before the end value of the correction range interval is taken as the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
In embodiment 7 of the present invention, the determining whether to adjust the current setting value according to the error value of the chilled water of the chiller and the difference value includes:
if the difference value is smaller than the chilled water error value, the current set value does not need to be adjusted;
if the difference is greater than the chilled water error value, the current set value needs to be adjusted.
It can be understood that, when the difference between the calculated current set value and the current actual measurement value does not satisfy the chilled water error value, the set value of the chilled water temperature needs to be adjusted, and the chilled water temperature obtained after the adjustment is defined as a water temperature correction value. Specifically, the water temperature correction value is obtained by calculating a cold machine operation parameter, and the cold machine is controlled to operate according to the water temperature correction value.
For example, the chilled water error value is 1 ℃, the difference between the current set value and the current actual measured value of the first chiller is calculated to be 2 ℃, and whether to adjust the current set value is judged according to the chilled water error value (1 ℃) and the difference (2 ℃) of the chillers. Specifically, the cloud refrigerator control system 100 compares the chilled water error value (1 ℃) with the calculated magnitude relationship of the difference (2 ℃) between the current set value and the current actual measurement value, and determines that the current set value needs to be adjusted according to the magnitude relationship obtained by the comparison, wherein the difference (2 ℃) is greater than the chilled water error value (1 ℃).
The cold machine energy-saving control method provided by the specific embodiment 7 of the present invention has the following beneficial effects:
according to the invention, the water temperature correction value of the chilled water is calculated through the operation parameters of the refrigerator, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
A second aspect.
Referring to fig. 1 and 3, in embodiment 8 of the present invention, the present invention provides a chiller energy saving control system, which is a subsystem of the cloud chiller control system 100. The cold machine energy-saving control system comprises:
and the difference value calculating module 10 is configured to obtain a current set value and a current actual measured value of the chilled water temperature every other preset time period, and calculate a difference value between the current set value and the current actual measured value.
The chilled water temperature adjusting and judging module 20 is used for judging whether to adjust the current set value according to the chilled water error value of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged; if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value.
Wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
For specific limitations of the chiller energy saving control system, reference may be made to the above limitations of the chiller energy saving control method, and details are not described here. All modules in the cold machine energy-saving control system can be completely or partially realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
It is understood that in a preferred embodiment of embodiment 8 of the present invention, the calculating the water temperature correction value according to the cold machine operation parameter includes:
judging whether the running time of the refrigerator is less than a preset running time or not;
if so, taking the current set value as the water temperature correction value;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating the water temperature correction value according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
It is to be understood that, in a preferred embodiment of embodiment 8 of the present invention, the condition for lowering the current setting value is: the current set value is smaller than the current actual measurement value;
the conditions for improving the current set value are as follows: the current set value is greater than the current actual measured value.
It is to be understood that, in a preferred embodiment of embodiment 8 of the present invention, the calculating the water temperature correction value according to the adjustment condition includes:
if the current set value and the current actual measured value meet the condition of reducing the current set value, the water temperature correction value is equal to the current actual measured value minus a first correction reference value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, the water temperature correction value is equal to the current actual measured value plus a first correction reference value.
It is to be understood that, in a preferred embodiment of embodiment 8 of the present invention, the calculating the water temperature correction value according to the adjustment condition includes:
if the current set value and the current actual measured value meet the condition of reducing the current set value, taking the minimum value of the set range interval as a water temperature correction value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, taking the maximum value of the set range interval as a water temperature correction value.
It is understood that in a preferred embodiment of embodiment 8 of the present invention, after calculating the water temperature correction value according to the cold machine operation parameter, the method further includes:
and adjusting the set range interval of the temperature of the chilled water according to a water temperature dynamic adjustment strategy.
It should be understood that, in a preferred embodiment of embodiment 8 of the present invention, the adjusting the set range interval of the chilled water temperature according to the water temperature dynamic adjustment strategy includes:
obtaining a cold machine freezing water flow, a freezing water inlet temperature measured value and a freezing water outlet temperature measured value of a cold machine;
calculating the actual load rate of the refrigerator according to the chilled water flow, the chilled water inlet temperature measurement value and the chilled water outlet temperature measurement value of the refrigerator;
judging whether the actual load rate of the refrigerator meets a preset load rate range or not; if so, keeping the set range interval of the chilled water temperature unchanged;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating a correction range interval according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
It is to be understood that, in a preferred embodiment of embodiment 8 of the present invention, the calculating a correction range interval according to the adjustment condition includes:
if the current set value and the current actual measurement value meet the condition of reducing the current set value, the maximum value of the correction range interval is equal to the maximum value of the set range interval minus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the set range interval minus the second correction reference value;
if the current setting value and the current actual measurement value meet the condition of improving the current setting value, the maximum value of the correction range interval is equal to the maximum value of the setting range interval plus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the setting range interval plus the second correction reference value.
It is to be understood that, in a preferred embodiment of the specific embodiment 8 of the present invention, the determining whether to adjust the current setting value according to the chilled water error value of the chiller and the difference value includes:
if the difference value is smaller than the chilled water error value, the current set value does not need to be adjusted;
if the difference is greater than the chilled water error value, the current set value needs to be adjusted.
According to the invention, the water temperature correction value of the chilled water is calculated through the operation parameters of the refrigerator, and the operation of the refrigerator is controlled according to the water temperature correction value, so that the accuracy of calculating the water temperature correction value is improved, the control cost of the refrigerator is reduced, and the energy waste is reduced.
In a third aspect.
The invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements a cold machine energy saving control method as set forth in the first aspect of the present application.
Claims (10)
1. A method for controlling energy conservation of a cold machine is characterized by comprising the following steps:
acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating a difference value between the current set value and the current actual measured value;
judging whether to adjust the current set value according to the error value of the chilled water of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged;
if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value;
wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
2. The chiller energy saving control method according to claim 1, wherein the calculating of the water temperature correction value according to the chiller operation parameters comprises:
judging whether the running time of the refrigerator is less than a preset running time or not;
if so, taking the current set value as the water temperature correction value;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating the water temperature correction value according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
3. The chiller energy saving control method according to claim 2,
the conditions for reducing the current set value are as follows: the current set value is smaller than the current actual measurement value;
the conditions for improving the current set value are as follows: the current set value is greater than the current actual measured value.
4. A chiller energy saving control method according to claim 2, wherein said calculating a water temperature correction value based on said adjustment condition comprises:
if the current set value and the current actual measured value meet the condition of reducing the current set value, the water temperature correction value is equal to the current actual measured value minus a first correction reference value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, the water temperature correction value is equal to the current actual measured value plus a first correction reference value.
5. A chiller energy saving control method according to claim 2, wherein said calculating a water temperature correction value based on said adjustment condition comprises:
if the current set value and the current actual measured value meet the condition of reducing the current set value, taking the minimum value of the set range interval as a water temperature correction value;
and if the current set value and the current actual measured value meet the condition of improving the current set value, taking the maximum value of the set range interval as a water temperature correction value.
6. The chiller energy saving control method according to claim 5, wherein after calculating the water temperature correction value according to the chiller operation parameters, the method further comprises:
and adjusting the set range interval of the temperature of the chilled water according to a water temperature dynamic adjustment strategy.
7. The energy-saving control method for the chiller according to claim 6, wherein the adjusting the setting range interval of the temperature of the chilled water according to the dynamic water temperature adjustment strategy comprises:
obtaining a cold machine freezing water flow, a freezing water inlet temperature measured value and a freezing water outlet temperature measured value of a cold machine;
calculating the actual load rate of the refrigerator according to the chilled water flow, the chilled water inlet temperature measurement value and the chilled water outlet temperature measurement value of the refrigerator;
judging whether the actual load rate of the refrigerator meets a preset load rate range or not; if so, keeping the set range interval of the chilled water temperature unchanged;
if not, judging whether the current set value and the current actual measurement value meet the adjustment condition, and calculating a correction range interval according to the adjustment condition;
wherein the adjustment condition includes: the condition of the current set value is reduced and the condition of the current set value is improved.
8. The chiller energy saving control method according to claim 7, wherein the calculating a correction range interval according to the adjustment condition includes:
if the current set value and the current actual measurement value meet the condition of reducing the current set value, the maximum value of the correction range interval is equal to the maximum value of the set range interval minus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the set range interval minus the second correction reference value;
if the current setting value and the current actual measurement value meet the condition of improving the current setting value, the maximum value of the correction range interval is equal to the maximum value of the setting range interval plus a second correction reference value, and the minimum value of the correction range interval is equal to the minimum value of the setting range interval plus the second correction reference value.
9. The energy-saving control method for the chiller according to claim 1, wherein the determining whether to adjust the current setting value according to the error value of the chilled water of the chiller and the difference value comprises:
if the difference value is smaller than the chilled water error value, the current set value does not need to be adjusted;
if the difference is greater than the chilled water error value, the current set value needs to be adjusted.
10. A cold machine energy-saving control system is characterized by comprising:
the difference value calculation module is used for acquiring a current set value and a current actual measured value of the temperature of the chilled water every other preset time period, and calculating the difference value between the current set value and the current actual measured value;
the chilled water temperature adjusting and judging module is used for judging whether to adjust the current set value according to the chilled water error value of the refrigerator and the difference value; if not, keeping the current set value of the chilled water temperature unchanged; if so, acquiring the operation parameters of the refrigerator, calculating a water temperature correction value according to the operation parameters of the refrigerator, and controlling the operation of the refrigerator according to the water temperature correction value;
wherein, the cold machine operation parameters include: the operation time of the cold machine and the set range of the temperature of the chilled water.
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Application publication date: 20211203 |