CN202581992U - Energy-saving cooling circulating water system - Google Patents
Energy-saving cooling circulating water system Download PDFInfo
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- CN202581992U CN202581992U CN 201220007492 CN201220007492U CN202581992U CN 202581992 U CN202581992 U CN 202581992U CN 201220007492 CN201220007492 CN 201220007492 CN 201220007492 U CN201220007492 U CN 201220007492U CN 202581992 U CN202581992 U CN 202581992U
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Abstract
The utility model discloses an energy-saving cooling circulating water system. The energy-saving cooling circulating water system comprises a circulating water pump, a cooling tower, a cooling water tank, an acquisition and test unit, a data analysis and optimization unit, an operation mode primary election unit and an operation mode comparison determination unit, wherein the acquisition and test unit is used for acquiring configuration parameters of equipment relevant to the circulating water system and testing actual operation parameters of the equipment, the data analysis and optimization unit is connected with the acquisition and test unit, the operation mode primary election unit is connected with the data analysis and optimization unit, and the operation mode comparison determination unit is connected with the operation mode primary election unit. Through the acquisition and test unit, the data analysis and optimization unit, the operation mode primary election unit and the operation mode comparison determination unit, current operation efficiency of a water pump, anomaly of pipeline accessories, such as valves, filters and high siphons, hydraulic balance of the system and needed water supply flow are comprehensively measured, pump station equipment number and modes are started, so that energy consumption of the system is lowered, and the purposes of energy conservation and consumption reducing are achieved.
Description
Technical field
The utility model belongs to cooling circulating water transfer system technical field, relates to a kind of energy-conservation cooling circulating water system.
Background technology
Cooling circulating water system is applied to comprise national economy production every field such as iron and steel, petrochemical industry, thermoelectricity as the important corollary system of a cover, and the current extensive style that is in basically operates, and its energy waste phenomenon is very serious.At present, the circulation running lacks a kind of method directly perceived, convenient, easy and simple to handle, can not in time judge water pump efficiency, can not promptly and accurately carry out pump operating condition adjustment etc., all can cause occurring the serious phenomenon of current energy waste.
In the prior art, water pump that several kinds of modes realize how carrying out system support type selecting has again been arranged, but still there is the drawback of following aspect in it:
1, the simple flow that will have now is corrected to metered flow, if having flow now greater than metered flow, but there is serious waterpower balance phenomenon in system, has a plurality of heat exchange bottlenecks, is adapted to metered flow and tends to make the heat exchange bottleneck to come out, and the system that influences normally uses;
2, improve water pump efficiency merely, water supply capacity reaches current water supply capacity, though the method does not exert an influence to current cooling effect, this technical electricity saving effect still has bigger space to excavate, and does not belong to state-of-the-art power-saving technology;
3, just simply solve the valve drag losses, local return loss, the pipeline blockage that cause because of equipment itself and cause loss etc., but deal with certain limitation, do not belong to state-of-the-art power-saving technology through modes such as maintenance, cleaning, replacings;
4, judge that according to whole supply and return water temperature just carrying out flow adjusts (in theory under system's production capacity one stable condition merely; Ultra flow operation can cause the temperature difference less than normal); This can only can reach purpose of energy saving in the outstanding system of hydraulic equilibrium; But system is if exist waterpower to distribute uneven or because fouling of heat exchangers seriously causes the heat band not come out; Then can cause reducing flow tend to the to come out phenomenon of the bad regional result of use variation of hydraulics or heat transfer boundary condition, influence is produced and is normally carried out;
5, equipment is changed after, just carry out equipment replacement merely, exist on the pumping station operation pattern and to optimize potentiality and do not realize energy-conservation halfway phenomenon.
So, to the above-mentioned defective that exists in the present prior art, be necessary to study in fact, so that a kind of scheme to be provided, solve the defective that exists in the prior art, realize the energy-saving and cost-reducing of cooling circulating water system.
Summary of the invention
For addressing the above problem, the purpose of the utility model is to provide a kind of energy-conservation cooling circulating water system, to reduce the energy consumption of cooling circulating water system, makes system energy consumption minimum.
For realizing above-mentioned purpose, the technical scheme of the utility model is:
A kind of energy-conservation cooling circulating water system; The collection of actual operation parameters that includes water circulating pump, cooling tower, water cooling pond, collection equipment configuration parameter relevant and testing equipment with circulation with test cell, be connected gather with test cell be used for according to the current water supply capacity of test data analysis whether reasonably data analysis with optimize unit, linking number according to one's analysis with optimize the unit and be used for tentatively confirming the operational mode primary election unit of a plurality of operational modes and be connected operational mode primary election unit tentatively definite a plurality of operational modes are compared, select the relatively more definite unit of operational mode of the minimum collocation pattern of energy consumption.
Further, said collection and test cell include device parameter collecting part and equipment actual operation parameters part of detecting; Wherein, said device parameter collecting part is used to gather the current all devices configuration parameter relevant with circulation; And said equipment actual operation parameters part of detecting is used for the actual operation parameters data of testing equipment.
Further, said equipment configuration parameter comprises manufacturer, model specification, the nominal parameter of equipment, and pipe arrangement, heat exchanger location information parameter; Said actual operation parameters data comprise pressure, temperature, flow and operate power.
Further, whether said data analysis is reasonable according to the current water supply capacity of test data analysis with the optimization unit, and unreasonable place in the system is optimized transformation.
Further; Saidly system is optimized transformation mainly comprises: optimization system hydraulic equilibrium, the bad problem of resolution system pipeline; Improve pipe-line system operational efficiency, Adjustment System, calculate normal pipe resistance characteristic curve, statistics production load variations, confirm the reasonable water supply flow indicator, select under the different load energy-efficient water pump and according to pumping plant economical operation principle; Under specific water supply flow prerequisite, confirm the operational mode of water pump.
Further, also include the pile that adopts the semiconductor chilling plate combination, be combined into refrigeration system with the method for pile series and parallel of the same type.
The utility model is relatively confirmed the unit through collection and test cell, data analysis and optimization unit, operational mode primary election unit and operational mode; The efficient of the current water pump operation of comprehensive consideration, pipeline fittings (valve, filter, eminence siphon pipe etc.) are unusual, system water dynamic balance and needed water supply flow; Open equipment of pumping station platform number and pattern; Make system energy consumption minimum, to realize energy saving purposes.
Description of drawings
Fig. 1 is the module frame chart of the utility model system.
Fig. 2 is the different operational mode performance overlaying flow-lifts of pumping plant (Q-H) figure of the utility model.
Fig. 3 is the separate unit water pump operation curve map of the utility model.
Fig. 4 is the pump characteristic and the pipeline performance curve graph of a relation of the utility model.
Wherein,
Among Fig. 2, a1 is 1 little pump operation curve, and a2 is 2 little parallel connection of pumps operation curves; A3 is 2 little parallel connection of pumps operation curves of 1 big pump, and a4 is 1 big pump operation curve, and a5 is 2 big parallel connection of pumps operation curves; A6 is a system requirements flow line, and a7 is a system requirements lift line.
Among Fig. 3, b1 is flow-lift (Q-H) curve, and b2 is flow-efficient (Q-η) curve, and b3 is flow-power (Q-P) curve, and b4 is flow-cavitation (Q-NPSHr) curve;
Among Fig. 4, c1 is a characteristic curve of pipeline, and c2 is a characteristic curve of pump, and c3 is for being the water pump operation operating point.
The specific embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Please referring to figs. 1 through shown in Figure 4; The energy-conservation cooling circulating water system of the utility model include the actual operation parameters of water circulating pump (not shown), cooling tower (not shown), water cooling pond (not shown) and collection equipment configuration parameter relevant and testing equipment with circulation collection and test cell, be connected gather with test cell be used for according to the current water supply capacity of test data analysis whether reasonably data analysis with optimize unit, linking number according to one's analysis with optimize the unit and be used for tentatively confirming the operational mode primary election unit of a plurality of operational modes and be connected operational mode primary election unit tentatively definite a plurality of operational modes are compared, select the relatively more definite unit of operational mode of the minimum collocation pattern of energy consumption.
Wherein gather and include device parameter collecting part and equipment actual operation parameters part of detecting with test cell.Said device parameter collecting part is used to gather the current all devices configuration parameter relevant with circulation, comprises manufacturer, model specification, nominal parameter of equipment etc., and information parameter such as pipe arrangement, heat exchanger position.And said equipment actual operation parameters part of detecting is used for the actual operation parameters data of testing equipment, comprises pressure, temperature, flow and operate power.It obtains current system result of use, and information such as design and actual production capacity provide the analysis foundation for system optimization is energy-conservation.
Whether said data analysis is reasonable according to the current water supply capacity of test data analysis with the optimization unit, and unreasonable place in the system is optimized transformation.Acting as of circulation carried out heat exchange with coming out heat in the production process through aqueous medium; Take the cooling tower cooling of dispelling the heat to; Wherein heat changes according to the production load variations; General System is designed with the specific temperature difference that instructs, and is 10 ℃ like the petroleum chemical industry design temperature difference, and following relation is arranged between caloric value M, temperature difference T, the flow Q:
M＝k×ΔT×Q
Then when caloric value one timing, the temperature difference and flow are inversely proportional to, if the temperature difference is less than normal, then water supply capacity has the possibility in the space of adjustment.
Said operational mode primary election unit is used for tentatively confirming a plurality of operational modes.System calculates the temperature difference according to current supply and return water temperature, judges current actual needs water supply flow, and through the different pump composite behaviour of this pumping plant stacking chart, preliminary definite plural number is planted operational mode.As shown in Figure 2, it shows the performance stacking chart of the different operational modes of pumping plant.
The minimum collocation pattern of energy consumption is selected through the determined a plurality of operational modes in operational mode primary election unit are compared in the relatively more definite unit of said operational mode
Under the determined every kind of operational mode in operational mode primary election unit, calculate operation flow, the lift of single pump under this kind pattern, again through separate unit list pump performance curve map; As shown in Figure 3; Calculate the power and the general power of every pump operation according to the pump power computing formula,, select the minimum collocation pattern of energy consumption through relatively to the general power under the several modes; And show, and point out every pump discharge pressure control data in the street man-machine go up intuitively.
Wherein, and pump power computing formula: P=(÷ (η motor * η water pump) of 0.00272 * Q * H), Q representes flow, the t/h of unit; H representes lift, the m of unit; And η representes efficient.
In the utility model practical application, need carry out system optimization and adjustment according to system's actual conditions.According to investigation, judge whether system exists phenomenons such as waterpower is unbalance, heat exchanger performance is not good enough, if there is above phenomenon, then adjust earlier or exchange device more.
Wherein, The optimization transformation of system mainly includes: optimization system hydraulic equilibrium, the bad problem of resolution system pipeline; Improve operational efficiency, the Adjustment System of pipe-line system, calculate normal pipe resistance characteristic curve, statistics production load variations, confirm the reasonable water supply flow indicator, select under the different load energy-efficient water pump and according to pumping plant economical operation principle; Under specific water supply flow prerequisite, confirm the water pump operation pattern.
The waterpower imbalance is meant that current water supply flow does not reach by causing the bad phenomenon of heat exchange effect under the various factors, comprise since the very high pressure of supply water deficiency of device cause flow can't be normally through, do not reach certain amount because fouling of heat exchangers need increase flow, owing to each branch road resistance coefficient difference causes assignment of traffic unequal.At present a lot of systems exist actual water supply flow greater than the designing requirement flow, and the operation supply backwater temperature difference is also smaller, does not reach the design standard temperature difference, but flow system flow reduces and can cause that the local heat exchange effect of system is bad, and influence is produced.This phenomenon is not that current water supply capacity is not enough, and the overwhelming majority is because because hydraulic equilibrium causes system to have the heat exchange bottleneck.Therefore resolution system waterpower energy imbalance is one step of key of the energy-conservation technological transformation of system optimization, also is that can system accomplish a maximum crucial step of energy conservation potential.
(1) the very high unbalanced problem of waterpower that causes of solving device
Compare higher system to certain heat-exchanger rig; Current water system manager often satisfies the heat exchanger water supply requirement that local flow requires very little height district through promoting whole delivery pressure head; And there is this water supply capacity excess phenomenon in most heat exchangers; Significantly improve the pumping plant water supply consumption, because of the pump energy consumption (P that is directly proportional with flow, pressure head first power
Former total=0.00272 * Q
AlwaysH
Former total/ η
Always), for height district heat exchanger, do not adopt the whole pressure head mode (whole flow is very big) that promotes, but through adopting pressurized mode (P
Increase=0.00272 * Q
IncreaseH
Increase/ η
Increase), the whole water supply consumption drop-out value of pumping plant reaches macroeconomic operation purpose much larger than booster pump energy consumption value added; If original system water supply total flow 10000t/h, general device needs water supply lift 30m, and high district's water supply needs water supply lift 45m; High district heat exchanger water requirement 150t/h then needs under the supercharging 15m situation, and not adopting local pressurized pump station need consume total electric weight is 1600kW; Need consume total electric weight through pumping plant after the supercharging is 1067kW; Booster pump needs consumed power 8kW, and total power consumption reduces 1600-(1067+8)=525kW, and energy consumption descends 32.8%.
(2) solve the heat exchanger heat exchange property and lowly cause the unbalanced problem of waterpower
(wherein Q is a heat, and A is a heat exchange area, and K is a thermal conductivity factor according to heat computing formula Q=AK (Tr-Δ t); Tr is the thermal medium mean temperature, and Δ t is cold medium mean temperature), when fouling of heat exchangers serious; When heat exchange property (thermal conductivity factor K) reduces; Current generally is to reach Δ t and reduce through strengthening whole output, thereby makes heat reach certain requirement, but whole energy consumption increase is very big.Therefore heat exchanger do not change and the constant situation of heat exchange area under, heat is strengthened, must reduce cold medium mean temperature Δ t, can reach requirement through reducing this branch road supply water temperature.Therefore employing is a kind of among the utility model embodiment need not can reach the reduction supply water temperature by refrigeration machine; And it is easy for installation; Unnecessaryly system is stopped production and investments such as not extra increase water system, utilize semiconductor refrigerating technology, the power right because of the single cooling module of semiconductor chilling plate is very little; Adopt the pile of semiconductor chilling plate combination among the utility model embodiment; Be combined into the refrigeration system of very big refrigerating capacity with the method for pile series and parallel of the same type, the temperature range of semiconductor chilling plate in theory can be realized for 130 ℃ to negative temperature from 90 ℃ of positive temperature.Utilize semiconductor refrigerating, pile is installed in pipeline outer wall with the parcel form, reach to supply channel cooling purpose.If system normally requires water supply flow 10000t/h, because the bad needs that cause of local heat exchange effect increase the entire system flow, increasing by 10% is 11000t/h; Since SR be proportional to flow square; Then resistance increases about 1.21 times, and it is about 33% that energy consumption increases, adopt this mode after; To required value 10000t/h, then energy consumption has the possibility of reduction by 33% with flow correction.
In addition, solving the hydraulic equilibrium problem also includes and regulates each branch road resistance coefficient and reach and regulate each branch road assignment of traffic purpose etc.One cover system supplies return main's pressure differential identical to each branch road; Be water main and return main's pressure differential, (wherein Δ P is for supplying pressure of return water poor, and S is a pipe resistance coefficient by Δ P=SQ2; Q is a water supply flow); Unbalance in pipe-line system waterpower is not under the very serious situation, changes this branch road resistance coefficient through valve regulated, thereby reaches the purpose that changes assignment of traffic.
The bad problem of pipeline comprise valve damage can not reach fully open position, plugged filter, vacuum degree control is unreasonable causes water vapor to form vapour locking etc.; This kind phenomenon tends to cause the pipeline local resistance to rise; According to the pump power formula, P ∝ QH, the every rising 10% of local resistance (has 2 meters like 20 meters lift local resistances; Then energy lets expense 10%), energy consumption lets expense 10%.
Judge whether pipe resistance is unusual; Adopt actual pressure to fall and fall comparison with normal pressure; Normal pressure falls through reference device producer data (as opens sharp centrifugal unit 19XR8787505EPS cooling water system under metered flow 1067t/h situation; Consult normal pressure and reduce to 10.42 meters), utilize ultrasonic test actual flow Q
Survey, utilize the test of high-precision pressure table to import and export equal altitudes pressure differential Δ P
Survey, compare through conversion and standard value, if actual pressure difference overgauge pressure differential, then resistance is unusual.
As Δ P
SurveyObviously greater than Δ P
StandardThe time, then resistance is unusual, to the unusual equipment of resistance, takes replacing, method for maintaining to solve.
Do not have pressure tap for system, can adopt the on-the-spot perforate pressure measurement of press and open holes device, this press and open holes utensil has perforate convenient, can be in any anti-riot, non-anti-riot zone all employable characteristics.
After solving the bad problem of above-mentioned hydraulic equilibrium and pipeline, pumping plant is in outstanding state operation with external system, through regulating the exit of pump valve; And will be series at the pressure loss of disperseing on the pipeline and focus on pump outlet, make system on the basis of normal operation, reduce output and pressure; After treating system stability; Measure adjustment back characteristic curve of pipeline, characteristic curve of pipeline is under the corresponding flow, the required drag relationship of pipe-line system.The pipe-line system characteristic relation:
H
Always=H
Clear height+ SQ
2
H
AlwaysFor system needs economic total (pumping) head (through converting after the gauge measurement force value), H
Clear heightBe pond to cooling tower freeboard poor (through tape measure) that S is the entire system resistance coefficient, Q is system's total flow (measuring through ultrasonic flowmeter).
H wherein
AlwaysThe conversion mode is following:
H
Always=(P
House steward-P
Pump inlet) * 102+ (h
House steward-h
Pump inlet)+Δ h
P representes pressure, units MPa; h
House stewardRepresent total hook gauge relative datum face height, the m of unit; h
Pump ImportExpression pump inlet Pressure gauge relative datum face height, the m of unit; Δ h representes pump import and export kinetic energy rejection, and the m of unit generally gets 1.5m.
By test and scaled value H
Always, H
Clear height, Q calculates the overall resistance coefficient S, draws characteristic curve of pipeline figure, and is as shown in Figure 4.
Statistics production load variations is confirmed the reasonable water supply flow indicator.Produce load and often change according to market conditions are different, different its system's thermic loads of load of producing are also different, need discharge also different, select typical high load capacity, two kinds of patterns of underload, confirm water requirement Q under two kinds of patterns
High load capacity, Q
Underload, through computing formula H
Always=H
Clear height+ SQ
2Or consult characteristic curve of pipeline, draw the pump head that needs under the different load.Under the accounting specific load, the flow Q value of confirming, and calculate required pump head, and being chosen in high efficiency energy saving pump most effective under this operating point, this moment, the water pump consumed power p of institute was:
P representes power, the kW of unit; Q representes flow, the t/h of unit; H representes lift, the m of unit; η representes efficient.
At last, according to pumping plant economical operation principle, under specific water supply flow prerequisite, confirm the water pump operation pattern.Wherein, to pumping plant multiple devices are arranged, in order to reach a certain demand volume, the plurality of operating modes combination can be arranged, every kind of combination all can have a consumed power value, confirms in the following manner under a certain demand volume, to make energy consumption minimum:
(1) in the same coordinate system (abscissa is a flow, and ordinate is a lift), according to characteristic curve of pump with each separate unit pump capacity---the lift performance curve draws in coordinate, and is as shown in Figure 2.
(2) performance curve between the various water pumps of pumping plant is made up stack, the quantity of overlay model has C
n p(n is a pump platform number; P is operation platform number, p=1,2 ... n), water pump parallel system stacking method is flow---the corresponding ordinate of head curve institute is constant, and the abscissa addition draws stack back combined running performance curve, and is as shown in Figure 2.
(3) normal characteristic curve of pipeline is plotted in the same coordinate system system; Draw characteristic curve of pipeline and plurality of operating modes superimposed curves intersection point; Selectable operational mode is water pump stack performance curve and characteristic curve of pipeline intersection point flow value >=required value; The corresponding lift value of pipeline characteristic curve is as shown in Figure 2 under lift value >=this flow.
(4) confirm to meet the requirements of the combined running pattern after, be starting point to require the flow point, draw one perpendicular to abscissa (flow coordinate) straight line; Form intersection point with each superimposed curves, also corresponding to the lift value of separate unit water pump operation, promptly this moment, flow was the operation total flow under the combined running to the ordinate lift value of this intersection point correspondence; Lift is the operation total (pumping) head under the combined running; Because of the parallel connection relation, also be separate unit water pump operation lift, as shown in Figure 2.
(5) with pairing water pump operation lift (H under every kind of integrated mode
Always) correspond in the single pump performance curve; Calculate operation flow (Q), efficient (η), the power (P) of single pump; Calculate the operate power sum (∑ P) of each water pump under this kind pattern; Get the operational mode of ∑ P minimum value, and the separate unit pump head adjusted under the corresponding lift operating mode of composite behaviour curve move, as shown in Figure 3.
(6) with the operational mode of water pump under form or each load of man-machine interface form reflection, displaying contents comprises: the operational mode (item) of the demonstration temperature difference of sensor, the range of flow of needs, pump group, the controlled pressure of exit of pump etc.In addition, needing flow will adjust the minimum requirements of taking into account system assignment of traffic, is not to have only full load 10% when preload, and flow is exactly the notion of metered flow 10%.According to the method for operation of form or the reflection of man-machine interface form, the operational management personnel can operate according to operation indicating intuitively.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (3)
1. energy-conservation cooling circulating water system; Include water circulating pump, cooling tower and water cooling pond; It is characterized in that; Also include: gather the actual operation parameters of equipment configuration parameter relevant and testing equipment with circulation collection and test cell, be connected gather with test cell be used for according to the current water supply capacity of test data analysis whether reasonably data analysis with optimize unit, linking number according to one's analysis with optimize the unit and be used for tentatively confirming the operational mode primary election unit of a plurality of operational modes and be connected operational mode primary election unit tentatively definite a plurality of operational modes are compared, select the relatively more definite unit of operational mode of the minimum collocation pattern of energy consumption.
2. energy-conservation according to claim 1 cooling circulating water system is characterized in that: said collection and test cell include device parameter collecting part and equipment actual operation parameters part of detecting; Wherein, said device parameter collecting part is used to gather the current all devices configuration parameter relevant with circulation; And said equipment actual operation parameters part of detecting is used for the actual operation parameters data of testing equipment.
3. energy-conservation according to claim 1 cooling circulating water system is characterized in that: said circulation also includes the pile that adopts the semiconductor chilling plate combination, is combined into refrigeration system with the method for pile series and parallel of the same type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220007492 CN202581992U (en) | 2012-01-09 | 2012-01-09 | Energy-saving cooling circulating water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220007492 CN202581992U (en) | 2012-01-09 | 2012-01-09 | Energy-saving cooling circulating water system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776215A (en) * | 2014-02-14 | 2014-05-07 | 张高博 | Device side based circulating fluid system optimization method |
| CN111412149A (en) * | 2020-03-26 | 2020-07-14 | 华润电力技术研究院有限公司 | Method, device and equipment for monitoring switching time of circulating water pump and storage medium |
-
2012
- 2012-01-09 CN CN 201220007492 patent/CN202581992U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776215A (en) * | 2014-02-14 | 2014-05-07 | 张高博 | Device side based circulating fluid system optimization method |
| CN111412149A (en) * | 2020-03-26 | 2020-07-14 | 华润电力技术研究院有限公司 | Method, device and equipment for monitoring switching time of circulating water pump and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Two 310012 Hangzhou Road, Zhejiang province Xihu District No. 195 Wen Wenxin building room 708 Patentee after: ZHEJIANG KEWEI ENERGY-SAVING TECHNOLOGY CO., LTD. Address before: Two 310012 Hangzhou Road, Zhejiang province Xihu District No. 195 Wen Wenxin building room 708 Patentee before: Zhejiang Ecowell Energy-Saving Technology Co., Ltd. |
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Granted publication date: 20121205 |