CN114857744A - Method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical value of central air conditioner - Google Patents
Method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical value of central air conditioner Download PDFInfo
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- 238000005265 energy consumption Methods 0.000 claims abstract description 37
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 claims description 57
- 230000004048 modification Effects 0.000 claims description 57
- 238000004378 air conditioning Methods 0.000 claims description 30
- 238000012423 maintenance Methods 0.000 claims description 14
- 230000009466 transformation Effects 0.000 abstract description 12
- 238000004134 energy conservation Methods 0.000 abstract description 6
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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
- F24F11/47—Responding to energy costs
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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
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/60—Energy consumption
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Abstract
The invention discloses a method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical values of a central air conditioner. Therefore, the problem that specific values of energy conservation and consumption reduction cannot be determined in energy conservation transformation or energy contract management is solved.
Description
Technical Field
The invention relates to the field of energy-saving metering of a central air conditioner. More particularly, the invention relates to a method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical values of a central air conditioner.
Background
At the present stage, when the energy-saving transformation of the central air conditioner is carried out, no matter the owner or the construction side can not accurately determine the accurate energy-saving effect of the energy-saving transformation project; in some specific occasions, when a party A needs to verify a specific energy-saving effect with a modifying party, especially in a contract energy management cooperation mode, because energy-saving and consumption-reducing values cannot be accurately determined, the two parties do not have a scientific metering basis, the party A and the party B are difficult to reach a consistency when energy-saving division is carried out, and even mutual skin tearing is caused, so that cooperation is not difficult to continue.
Disclosure of Invention
In order to solve the above characteristics and problems, a method for quantitatively calculating the energy-saving and consumption-reducing numerical value of the central air conditioner is provided. By adopting the method, various energy-saving modes before and after the central air conditioner is reformed are analogized, and intuitive and detailed energy-saving data can be obtained.
The purpose of the invention is realized by the following technical scheme.
A method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical values of a central air conditioner is characterized in that energy consumption data before and after modification of a central air conditioning system are compared to obtain energy-saving and consumption-reducing quantity after modification and before modification; the energy saving and consumption reducing amount comprises energy saving of a machine room, energy saving of the tail end of an air conditioner, consumption reduction of operation cost and consumption reduction of maintenance cost.
The method is utilized to calculate and calculate the central air-conditioning system before modification to obtain an inherent input energy consumption-load rate curve of the central air-conditioning system machine room before modification; and measuring and calculating the modified central air-conditioning system to obtain an inherent input energy consumption-load rate curve of the machine room of the modified central air-conditioning system.
On the premise of meeting the same terminal load rate, comparing two different input energy consumption-load rate curves displayed by the machine room before and after modification, finding out the input energy consumption consumed by the central air-conditioning system after modification and the central air-conditioning system before modification on the curves, and performing difference calculation to compare the energy-saving and consumption-reducing values under the current load rate after modification; and counting the energy saving and consumption reducing values at all the moments to obtain the energy saving amount of the machine room in a time period.
Because the central air-conditioning system is managed or technically modified, the tail end of the air conditioner is influenced by energy consumption, the energy consumption values of a certain room in unit time after modification and before modification are measured, and the difference value of the energy consumption values after modification and before modification is calculated; and then counting the difference values of all rooms at all times to obtain the energy saving amount of the air conditioner terminal.
When the central air-conditioning system after modification has the functions of automatic adjustment and the like, the method compares the expenses required by operation management before and after modification, and the expense difference is the consumption reduction of the operation expenses.
When the central air-conditioning system after modification has the functions of intelligent maintenance, automatic order dispatching and the like, the method compares the costs required by the maintenance before and after modification, and the cost difference is the consumption reduction of the maintenance cost.
All the energy saving and consumption reducing cost is the sum of the energy saving amount of the machine room, the energy saving amount of the air conditioner tail end, the consumption reducing amount of the operation cost and the consumption reducing amount of the maintenance cost.
The invention has the beneficial effects that:
through measurement and calculation, the method achieves the purpose of obtaining energy-saving and consumption-reducing data comparison before and after practical, feasible and meaningful reconstruction by utilizing different input energy consumption generated by the same terminal air conditioner load under the same load rate.
By the method, the owner A and the construction party B can intuitively obtain the energy conservation and consumption reduction, and the condition that the two parties can only negotiate to obtain consensus on the premise of unclear energy conservation effect in the past is avoided.
Drawings
FIG. 1 is a schematic diagram of input energy consumption-load rate curves before and after modification in the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting.
The method for quantitatively measuring and calculating the energy-saving and consumption-reducing numerical value of the central air conditioner can accurately obtain the energy-saving and consumption-reducing numerical value after energy conservation and reconstruction. The specific number of the energy-saving values can be obtained by obtaining the difference value of the energy consumption values of the operation after the modification and the operation before the modification and comparing the energy consumption values; and subtracting the operation energy consumption value before modification from the operation energy consumption after modification to obtain a result, if the result is a negative number, marking the result as energy-saving, subtracting the operation energy consumption value before modification from the operation energy consumption after modification to obtain a result, and if the result is a positive number, marking the result as energy-saving.
When the system is used for measuring, an energy meter or a flow rate meter and a thermometer need to be additionally arranged between the output pipeline of the machine room and the tail end output pipeline, and the energy meter or the flow rate meter and the thermometer are used for measuring the energy consumption value required by the tail end load when the system runs; and dividing the energy consumption value required by the terminal load at a certain moment by the terminal overall load value designed by the system to obtain the running load rate of the terminal equipment at the moment.
And simultaneously recording the electric energy and gas consumption displayed on meters such as an electric meter, a gas meter and the like when the load consumption is generated in the time.
The specific strategy is as follows:
1. as shown in fig. 1, the energy consumption value before modification is calculated and measured: before transformation, the equipment is comprehensively checked and counted, the input energy consumption value of the central air-conditioning system under different terminal load rate outputs is calculated, and frequent and repeated statistics under different loads and different scenes are carried out to form a corresponding input energy consumption-load rate curve 1;
calculating and measuring the energy consumption value after modification: after the transformation, the equipment is comprehensively checked and counted, the input energy consumption value of the central air-conditioning system under the condition of the same terminal load equipment and different terminal load rate output is calculated, and frequent and repeated statistics under different loads and different scenes is carried out to form a corresponding input energy consumption-load rate curve 2. Compared with a system before transformation, the system is not a specific device or a specific load, and the system measures the system load rate corresponding to the output cold/heat load, so that the condition of the end device corresponding to specific energy consumption does not need to be determined.
Before quantitatively measuring and calculating the energy-saving value of the central air conditioner, the characteristic curve of the system needs to be measured, once the hardware system and the control logic of the central air conditioner are established, the dynamic and static data characteristics of the system basically do not fluctuate too much, and the input energy consumption-load rate curve can be uniquely determined. After an input energy consumption-load rate curve 1 of an original system before modification is measured through multiple experiments, the curve is used as a reference value to be input into a database to establish a characteristic model of the central air conditioner before modification, and the characteristic model is used as a base number for quantitative measurement and calculation.
After the system is transformed, a new input energy consumption-load rate curve 2 can be measured according to a new hardware system and a new control logic of the central air conditioner, the measured input energy consumption-load rate curve 2 of the transformed new system is input into a database as a comparison value to establish a model, and the model is used as variable data to compare quantification in the system model before transformation.
Compared with energy consumption data generated under the same integral terminal load of the system before modification, the energy-saving data discussed under different terminal loads must be compared, and the comparison is meaningless and unfair for both owners and engineering parties. When the new equipment is added on the basis of the original modified equipment and exceeds the original design load, the part exceeding the design load needs to be separately analogically measured and calculated with the full-load working condition.
Based on the input energy consumption-load rate curve 1 and the input energy consumption-load rate curve 2 measured and calculated in the above, the input energy consumption values of the respective consumptions before and after the modification are compared on the premise that the systems before and after the modification generate the same load rate.
In the following we will describe this comparison and calculation in detail:
when the system runs at a certain terminal load q21 'within the time t1, inquiring the energy consumption-load curve 2 to obtain that the real-time input power consumed by the modified central air conditioner to meet the terminal load q 21' is q 21; comparing the query energy consumption-load curve 1, when the end load q11 ' = q21 ', the input power consumed when the central air conditioner before modification meets the end load q11 ' is q 11;
similarly, in the time t2, when the system runs at a certain terminal load q22 'after the modification, the energy consumption-load curve 2 is inquired, and the real-time input power consumed when the central air conditioner meets the terminal load q 22' after the modification is obtained as q 22; comparing the query energy consumption-load curve 1, when the end load q12 ' = q22 ', the input power consumed when the central air conditioner before modification meets the end load q12 ' is q 12;
analogically calculating according to the method;
similarly, in the time tn, when the system runs at a certain terminal load q2n 'after being modified, the energy consumption-load curve 2 is inquired, and the real-time input power consumed when the central air conditioner meets the terminal load q2 n' after being modified is q2 n; comparing and inquiring the energy consumption-load curve 1, when the end load q1n ' = q2n ', the input power consumed when the central air conditioner before modification meets the end load q1n ' is q1 n;
in summary, in the time period of t1+ t2+ … … + tn, compared with the central air conditioning system before modification, the energy consumption value saved by the machine room is:
q=( q21- q11)* t1+( q22- q12)* t2+……+( q2n- q1n)* tn= Ʃ(q2 –q1)*t
the savings is f1= q c1= Ʃ (q 2-q 1) t c1, where c1 is the corresponding energy unit price.
When a new central air-conditioning management system adopted after transformation combines management means with air-conditioning operation, for example, administrative means such as management system and performance assessment are integrated into an air-conditioning regulation mode, modes such as timing startup and shutdown, remote startup locking, super-energy consumption assessment and the like are realized, and energy-saving effect is brought by introducing software setting into management means control equipment. On the premise of not adopting energy-saving measures of a machine room, the energy-saving energy consumption value is calculated as follows:
the energy saving value can be obtained by selecting the room 1 before modification, and installing a meter to measure the energy consumption value in a fixed time interval on the premise of adopting the system before modification and keeping the original use habit, so as to obtain the average energy consumption k11 in unit time. After the improvement, the new central air-conditioning management system is used, the terminal equipment is controlled by a software means, and if measures such as forcibly setting fixed temperature, closing the air conditioner after detecting that a window is opened, carrying out energy consumption flow statistics, timing on-off and the like are taken, the average energy consumption per unit time generated in the same room is measured to be k12 in the same time interval. The energy consumption values of the rooms 1 before and after the modification are different from each other by k1= k12-k11, and the energy consumption value difference of the room n per unit time is kn = kn2-kn 1. The energy savings for all rooms in the same time interval was calculated as k = Ʃ kn t. The savings is f2= k × c2= Ʃ kn × t × c2, where c2 is the corresponding energy unit price.
When the new central air-conditioning management system adopted after transformation has an automatic adjustment mode, because the system changes the situation that the original system can only be manually adjusted, the automatic adjustment of each parameter is realized, and the optimal energy conservation and balance can be achieved. Therefore, compared with the original system, the system does not need to reserve excessive maintenance and maintenance personnel, and can reduce the labor intensity of management and maintenance personnel. And the difference of the operation management expenses generated before and after the transformation is recorded as m.
When the new central air-conditioning management system can prompt fault information and realize functions of automatic dispatching and the like after transformation, the system fault information can be accurately and timely exposed, original measures and solving measures are automatically generated according to fault library prompt, the inspection intensity of maintenance personnel is reduced, the time for solving the faults is shortened, and subsequent risks caused by the system faults are reduced. And the difference value of the maintenance cost generated before and after the transformation is recorded as n.
In summary, it can be found that all the energy saving costs of the system after modification are:
energy savings = f1+ f2+ m + n = Ʃ (q 2-q 1) t c1+ Ʃ kn t c2+ m + n;
the above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (6)
1. A method for quantitatively measuring and calculating energy-saving and consumption-reducing numerical values of a central air conditioner is characterized in that energy consumption data before and after modification of a central air conditioning system are compared to obtain energy-saving and consumption-reducing quantity after modification and before modification; the energy saving and consumption reducing amount comprises energy saving of a machine room, energy saving of the tail end of an air conditioner, consumption reduction of operation cost and consumption reduction of maintenance cost.
2. The method for quantitatively measuring and calculating the energy saving and consumption reducing numerical value of the central air conditioner as claimed in claim 1, wherein the inherent input energy consumption-load rate curve of the machine room of the central air conditioning system before modification is obtained by measuring and calculating the central air conditioning system before modification; and measuring and calculating the modified central air-conditioning system to obtain an inherent input energy consumption-load rate curve of the machine room of the modified central air-conditioning system.
3. The method for quantitatively measuring and calculating the energy-saving and consumption-reducing numerical value of the central air conditioner as claimed in claim 1, wherein on the premise of meeting the same terminal load rate, two different input energy consumption-load rate curves displayed by the machine room before and after modification are compared, the input energy consumption consumed by the central air conditioning system after modification and the central air conditioning system before modification are respectively found out on the curves, and the difference calculation is carried out to compare the energy-saving and consumption-reducing numerical value under the current load rate after modification; and counting the energy saving and consumption reducing values at all the moments to obtain the energy saving amount of the machine room in a time period.
4. The method for quantitatively measuring and calculating the energy saving and consumption reducing value of a central air conditioner as claimed in claim 1, wherein the energy consumption of the air conditioner terminal is affected by the management or technical means of the central air conditioning system after the modification, the energy consumption values of a certain room in unit time after the modification and before the modification are measured, and the difference between the energy consumption values after the modification and before the modification is calculated; and then counting the difference values of all rooms at all times to obtain the energy saving amount of the air conditioner terminal.
5. The method as claimed in claim 1, wherein when the central air conditioning system has automatic adjustment function, the fees required by the operation management before and after the modification are compared, and the difference between the fees is the consumption of the operation fee.
6. The intelligent energy management system for air conditioning energy according to claim 1, wherein when the modified central air conditioning system has functions of intelligent maintenance, automatic dispatching and the like, the costs required by the maintenance before and after modification are compared, and the difference between the costs is the consumption of the maintenance cost.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| US20110160913A1 (en) * | 2009-12-31 | 2011-06-30 | Schneider Electric USA, Inc. | Methods and apparatuses for displaying energy savings from an hvac system |
| CN106969465A (en) * | 2017-03-21 | 2017-07-21 | 深圳达实智能股份有限公司 | Central air-conditioning in office building system magnetic suspension cold water host control method and device |
| CN110873360A (en) * | 2018-09-03 | 2020-03-10 | 国网信息通信产业集团有限公司 | Energy saving amount determining method and device for heating energy saving reconstruction project |
| CN111222191A (en) * | 2020-02-12 | 2020-06-02 | 山东大学 | Building energy consumption optimization control method and system based on BIM and RFID |
| CN112556096A (en) * | 2020-10-27 | 2021-03-26 | 杭州亿友信息技术有限公司 | Novel energy-saving confirmation method for machine room |
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- 2022-06-23 CN CN202210717241.2A patent/CN114857744B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| US20110160913A1 (en) * | 2009-12-31 | 2011-06-30 | Schneider Electric USA, Inc. | Methods and apparatuses for displaying energy savings from an hvac system |
| CN106969465A (en) * | 2017-03-21 | 2017-07-21 | 深圳达实智能股份有限公司 | Central air-conditioning in office building system magnetic suspension cold water host control method and device |
| CN110873360A (en) * | 2018-09-03 | 2020-03-10 | 国网信息通信产业集团有限公司 | Energy saving amount determining method and device for heating energy saving reconstruction project |
| CN111222191A (en) * | 2020-02-12 | 2020-06-02 | 山东大学 | Building energy consumption optimization control method and system based on BIM and RFID |
| CN112556096A (en) * | 2020-10-27 | 2021-03-26 | 杭州亿友信息技术有限公司 | Novel energy-saving confirmation method for machine room |
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