CN112560175A - Design method of heat exchange system - Google Patents
Design method of heat exchange system Download PDFInfo
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- CN112560175A CN112560175A CN202011431677.2A CN202011431677A CN112560175A CN 112560175 A CN112560175 A CN 112560175A CN 202011431677 A CN202011431677 A CN 202011431677A CN 112560175 A CN112560175 A CN 112560175A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 96
- 230000035945 sensitivity Effects 0.000 claims abstract description 34
- 239000002826 coolant Substances 0.000 claims description 86
- 238000011156 evaluation Methods 0.000 claims 3
- 239000000446 fuel Substances 0.000 description 33
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The application belongs to the technical field of heat exchange system design, and particularly relates to a heat exchange system design method, which comprises the following steps: presetting a plurality of heat transmission paths; evaluating the heat exchange efficiency of various heat transmission paths, and taking several heat transmission paths with relatively high heat exchange efficiency as available heat transmission paths; the sensitivity of various available heat transmission paths is evaluated, and the available heat transmission path with low sensitivity is selected as the used heat transmission path.
Description
Technical Field
The application belongs to the technical field of heat exchange system design, and particularly relates to a heat exchange system design method.
Background
The airborne fuel oil is an important cold source on the airplane and is mainly used for dissipating heat of airborne electronic equipment, high-temperature bleed air of an airplane environment control system, hydraulic oil of an airplane hydraulic system and lubricating oil of an airplane generator through the heat exchanger.
The heat transmission path refers to the connection sequence and layout form of various heat exchangers in the heat exchange system, wherein the connection sequence refers to the arrangement sequence of the various heat exchangers in the flowing direction of the heat exchange medium; the layout mode refers to the installation positions of various types of heat exchangers and the series-parallel connection relationship of the heat exchangers.
The heat exchange effect between different heat transmission paths has difference, shows in the difference of heat exchange efficiency, and the heat exchange medium heat transfer volume including the same flow is different, and the heat exchange medium flow that the same heat exchange volume needs is different to and show that there is difference in the sensibility to heat exchange medium flow, temperature variation.
At present, use the heat transfer system of machine-carried fuel as the cold source, design according to the experience by technical staff more, lack the scientificity, its heat transfer effect is difficult to guarantee.
The present application has been made in view of the above-mentioned technical drawbacks.
It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present application.
Disclosure of Invention
It is an object of the present application to provide a method of designing a heat exchange system to overcome or mitigate at least one of the technical deficiencies of the known prior art.
The technical scheme of the application is as follows:
a method for designing a heat exchange system comprises the following steps:
presetting a plurality of heat transmission paths;
evaluating the heat exchange efficiency of various heat transmission paths, and taking several heat transmission paths with relatively high heat exchange efficiency as available heat transmission paths;
the sensitivity of various available heat transmission paths is evaluated, and the available heat transmission path with low sensitivity is selected as the used heat transmission path.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the heat exchange efficiency of each heat transfer path specifically includes:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the heat exchange efficiency of each heat transfer path specifically includes:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the heat exchange efficiency of each heat transfer path specifically includes:
the heat load of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
According to at least one embodiment of the present application, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the heat load of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission paths of each type of heat exchanger with relatively gentle change of the outlet temperature of the cooling medium is low.
Drawings
FIG. 1 is a schematic diagram of a heat exchange system design method provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of various heat transfer paths of a heat exchange system using an onboard fuel as a heat sink according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the onboard fuel outlet temperature of each type of heat exchanger under various heat transfer paths, with the onboard fuel temperature kept unchanged and the onboard fuel flow changed, provided by the embodiment of the application;
FIG. 4 is a schematic diagram of the onboard fuel outlet temperature of each type of heat exchanger under various heat transfer paths, with the onboard fuel flow kept unchanged and the onboard fuel temperature changed, provided by the embodiment of the application;
FIG. 5 is a schematic diagram of the present application, which is used for changing the thermal load of the onboard fuel and examining the onboard fuel outlet temperature of each type of heat exchanger under various heat transfer paths;
wherein:
1-an onboard electronic equipment heat exchanger; 2-a high-temperature bleed air heat exchanger of an aircraft environmental control system; 3-plane
A hydraulic oil heat exchanger of the hydraulic system; 4-an aircraft generator lubricating oil heat exchanger;
p1 — first heat transfer path; p2 — second heat transfer path; p3-third heat transfer path;
p4 — fourth heat transfer path; p5-fifth heat transfer path.
For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; further, the drawings are for illustrative purposes, and terms describing positional relationships are limited to illustrative illustrations only and are not to be construed as limiting the patent.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general designs, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.
In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The word "comprising" or "comprises", and the like, when used in this description, is intended to specify the presence of stated elements or items, but not the exclusion of other elements or items.
Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.
The present application is described in further detail below with reference to fig. 1 to 5.
A method for designing a heat exchange system comprises the following steps:
presetting a plurality of heat transmission paths;
evaluating the heat exchange efficiency of various heat transmission paths, and taking several heat transmission paths with relatively high heat exchange efficiency as available heat transmission paths;
the sensitivity of various available heat transmission paths is evaluated, and the available heat transmission path with low sensitivity is selected as the used heat transmission path.
For the heat exchange system design method disclosed in the above embodiments, it can be understood by those skilled in the art that, among the plurality of preset transmission paths, several heat transmission paths with relatively high heat exchange efficiency are used as the available heat transmission paths, that is, the heat exchange system is designed to include a plurality of heat transmission paths, and the available heat transmission path with low sensitivity is used as the used heat transmission path, that is, the heat exchange system can switch between the available heat transmission paths according to actual situations, and the available heat transmission path with low sensitivity is used as the used heat transmission path in the current actual situations.
For the heat exchange system design method disclosed in the above embodiments, it can be further understood by those skilled in the art that the low sensitivity of the heat transfer path means that the heat transfer path is insensitive to the flow and temperature changes of the heat exchange medium, the sensitivity of the heat transfer path may be different under different conditions, and when the actual flow and temperature of the heat exchange medium change, the available heat transfer path with low sensitivity is used as the heat transfer path, so that a larger safety interval can be maintained.
For the heat exchange system design method disclosed in the above embodiments, it can be further understood by those skilled in the art that several heat transmission paths with relatively high heat exchange efficiency are used as the available heat transmission paths, so that the heat exchange efficiency of the heat exchange system can be ensured to be at a higher level, the available heat transmission paths are switched among the available heat transmission paths, and the available heat transmission paths with low sensitivity are used as the used heat transmission paths.
For the design method of the heat exchange system disclosed in the above embodiment, it can be further understood by those skilled in the art that switching between the available heat transfer paths can be realized based on the intelligent conversion valve, and specifically, according to the actual situation, the switch of the intelligent conversion valve can be controlled to make the corresponding pipes between the heat exchangers of each type flow or cut off, so as to change the connection sequence and layout form of the heat exchangers of each type, thereby realizing switching between the available heat transfer paths, and in addition, the flow of the heat exchange medium flowing to the heat exchangers of each type can be adjusted by controlling the opening degree of the intelligent conversion valve.
For the heat exchange system design method disclosed in the above embodiments, it can be further understood by those skilled in the art that the presetting of multiple heat transfer paths means that the multiple heat transfer paths are obtained by changing the connection sequence and layout form of each type of heat exchanger in the heat exchange system, and the change needs to satisfy the heat exchange constraint of each type of heat exchanger in the heat exchange system.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating heat exchange efficiency of each heat transfer path specifically includes:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating heat exchange efficiency of each heat transfer path specifically includes:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating heat exchange efficiency of each heat transfer path specifically includes:
the heat load of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
As for the design method of the heat exchange system disclosed in the above embodiments, it can be understood by those skilled in the art that, in the above heat exchange system, the cooling medium is used as the cold source of each type of heat exchanger, and in each heat transfer path, each type of heat exchanger has different connection sequence and layout form along the flow direction of the cooling medium, the temperature of the cooling medium is kept unchanged, the flow rate of the cooling medium is changed, or the flow rate of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, or the heat load faced by the cooling medium, i.e. the flow rate and the temperature of the cooling medium are dynamically changed, the outlet temperature of the cooling medium of each type of heat exchanger in each heat transfer path is examined, the distribution among the outlet temperatures of the cooling medium of each type of heat exchanger is relatively compact, which shows that the cascade use effect of the cooling medium in the heat transfer path, this kind of heat transfer route heat exchange efficiency is higher relatively.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
In some optional embodiments, in the above method for designing a heat exchange system, the evaluating the sensitivities of the various available heat transfer paths includes:
the heat load faced by the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission paths with relatively gentle change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
For the heat exchange system design method disclosed in the above embodiment, it can be understood by those skilled in the art that, in the heat exchange system, the temperature of the cooling medium is kept unchanged, the flow rate of the cooling medium is changed, or the flow rate of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, or the heat load faced by the cooling medium is changed, that is, the flow rate and the temperature of the cooling medium dynamically change, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is examined, and the change of the outlet temperature of the cooling medium of each type of heat exchanger is relatively gentle, which indicates that the heat transmission path is less affected by the flow rate and the temperature change of the cooling medium.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
In order to make the technical scheme disclosed in the present application be understood more easily by those skilled in the art, the present application describes a design of a heat exchange system using an onboard fuel as a cold source on an aircraft, and the process is as follows:
on the premise of meeting heat exchange constraint, the connection sequence and layout form of an onboard electronic equipment heat exchanger 1, an aircraft environment control system high-temperature bleed-air heat exchanger 2, an aircraft hydraulic system hydraulic oil heat exchanger 3 and an aircraft generator lubricating oil heat exchanger 4 are changed, and a plurality of heat transmission paths are obtained through presetting, wherein the heat transmission paths include a first heat transmission path P1, a second heat transmission path P2, a third heat transmission path P3, a fourth heat transmission path P4 and a fifth heat transmission path P5 as shown in FIG. 2;
keeping the temperature of the onboard fuel unchanged, changing the flow of the onboard fuel, and inspecting the temperature of the onboard fuel outlet of each type of heat exchanger under various heat transmission paths, as shown in fig. 3;
keeping the flow of the onboard fuel unchanged, changing the temperature of the onboard fuel, and inspecting the temperature of the onboard fuel outlet of each type of heat exchanger under various heat transmission paths, as shown in FIG. 4;
changing the heat load of the onboard fuel, and observing the onboard fuel outlet temperature of each type of heat exchanger under various heat transmission paths, as shown in FIG. 5;
in fig. 3-5, it can be seen that in the first heat transfer path P1, the second heat transfer path P2, the third heat transfer path P3 and the third heat transfer path P4, the distribution range of the onboard fuel outlet temperatures of the heat exchangers is wide, which indicates that the gradient between the onboard fuel outlet temperatures of the heat exchangers is large, the cascade use effect of the onboard fuel is poor, and the heat exchange efficiency is low, and in the fifth heat transfer path P5 and the sixth heat transfer path P6, the onboard fuel outlet temperatures of the heat exchangers are relatively compact, which indicates that the cascade use effect of the onboard fuel is excellent, the cooling capability of the onboard fuel is fully exerted, and the heat exchange efficiency is relatively high, and the fifth heat transfer path P5 and the sixth heat transfer path P6 can be used as available heat transfer paths;
in the situation provided in fig. 5, the change in the thermal load of the on-board fuel may indicate the change in the amount of on-board fuel and the change in the temperature thereof as the aircraft flies, and it is found by analysis that the change in the on-board fuel outlet temperature of each type of heat exchanger in the fifth heat transfer path P5 is relatively gradual within 0-170min, indicating that the sensitivity of the fifth heat transfer path P5 is relatively low during this time period, and that it may be used as a heat transfer path, and that the change in the on-board fuel outlet temperature of each type of heat exchanger in the sixth heat transfer path P6 is relatively gradual after 170min, indicating that the sensitivity of the sixth heat transfer path P6 is relatively low during this time period, and that it may be used as a heat transfer path;
in addition, as can be seen from the analysis, in the fifth heat transfer path P5 and the sixth heat transfer path P6, the temperature of the onboard fuel outlet of the onboard electronic device heat exchanger 1 is relatively low, and the temperature of the onboard fuel outlet of the aircraft environmental control system high-temperature bleed air heat exchanger 2 is relatively high, so that the onboard fuel flow to the onboard electronic device heat exchanger 1 can be reduced and the onboard fuel flow to the aircraft environmental control system high-temperature bleed air heat exchanger 2 can be increased according to the actual situation.
Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.
Claims (7)
1. A method for designing a heat exchange system, comprising:
presetting a plurality of heat transmission paths;
evaluating the heat exchange efficiency of various heat transmission paths, and taking several heat transmission paths with relatively high heat exchange efficiency as available heat transmission paths;
the sensitivity of various available heat transmission paths is evaluated, and the available heat transmission path with low sensitivity is selected as the used heat transmission path.
2. The method of designing a heat exchange system according to claim 1,
the heat exchange efficiency of various heat transmission paths is evaluated, and the method specifically comprises the following steps:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
3. The method of designing a heat exchange system according to claim 1,
the heat exchange efficiency of various heat transmission paths is evaluated, and the method specifically comprises the following steps:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
4. The method of designing a heat exchange system according to claim 1,
the heat exchange efficiency of various heat transmission paths is evaluated, and the method specifically comprises the following steps:
the heat load of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the heat transmission paths with relatively compact distribution among the outlet temperatures of the cooling medium of each type of heat exchanger have higher heat exchange efficiency.
5. The method of designing a heat exchange system according to claim 1,
the evaluation of the sensitivity of the various available heat transport paths is described in particular by:
the temperature of the cooling medium is kept unchanged, the flow of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
6. The method of designing a heat exchange system according to claim 1,
the evaluation of the sensitivity of the various available heat transport paths is described in particular by:
the flow of the cooling medium is kept unchanged, the temperature of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission path with relatively smooth change of the outlet temperature of the cooling medium of each type of heat exchanger is lower.
7. The method of designing a heat exchange system according to claim 1,
the evaluation of the sensitivity of the various available heat transport paths is described in particular by:
the heat load of the cooling medium is changed, the outlet temperature of the cooling medium of each type of heat exchanger under various heat transmission paths is inspected, and the sensitivity of the heat transmission paths of each type of heat exchanger with relatively gentle change of the outlet temperature of the cooling medium is low.
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