CN106595361A - Operating temperature optimization method and design method for gravity loop heat pipe system - Google Patents
Operating temperature optimization method and design method for gravity loop heat pipe system Download PDFInfo
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- CN106595361A CN106595361A CN201710012798.5A CN201710012798A CN106595361A CN 106595361 A CN106595361 A CN 106595361A CN 201710012798 A CN201710012798 A CN 201710012798A CN 106595361 A CN106595361 A CN 106595361A
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- heat pipe
- loop heat
- coagulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/06—Control arrangements therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
Abstract
The invention discloses an operating temperature optimization method and design method for a gravity loop heat pipe system. By means of the operating temperature optimization method for the gravity loop heat pipe system, the problems that the relationship among all components of a gravity type loop heat pipe cannot be expressed through independent design calculation, an optimized result cannot be obtained, and an optimal working state cannot be achieved are solved, and the effects that a heat transmission relation is established between an evaporator and a condenser, and the working temperature of the loop heat pipe can be directly obtained through one-time calculation are achieved. According to the technical scheme, the operating temperature optimization method comprises the steps that the heat transmission process of the gravity loop heat pipe system from a heat source to a cold source is divided into a plurality of heat transmission links, and then a loop heat pipe heat resistance network model of the gravity loop heat pipe system is built; and based on the loop heat pipe heat resistance network model of the gravity loop heat pipe system and the heat balance constraint condition of the loop heat pipe, the operating temperature of the loop heat pipe is the optimal temperature under the condition that the heat exchange area of the gravity loop heat pipe system is minimum.
Description
Technical field
The invention belongs to gravity loop heat pipe design field, more particularly to a kind of gravity loop heat pipe system operating temperature
The method for designing of optimization method and system.
Background technology
With the industry demand of China's building energy conservation especially Constructing data center, with gravity loop heat pipe technology as core
Data center's cooling technology have broad application prospects.The principle of the thermal management technology of gravity loop heat pipe is：Vaporizer with
Thermal source is connected, and the heat transfer that thermal source is produced makes the medium evaporation in vaporizer be changed into steam to vaporizer.In density contrast
Under driving, steam ascends into the coagulator positioned at external environment by Natural Circulation driving force.Release to external world by environment for coagulator
Thermal discharge, working media are condensed into liquid, and under the driving of gravity, automatic back flow is to vaporizer.And so on circulate, by phase
Become heat exchange, the flowing of medium is realized by Natural Circulation, system phase-change heat-exchange effect exchanges heat far above single-phase convection, and is not required to
Extraneous driving force is wanted, completely passive formula cooling is realized.
After Fukushima, Japan nuclear power station generation accidents in 2011, the popular concern space to nuclear plant safety is improved.Core is anti-
After answering heap forced shutdown, still there is decay heat to produce, if can not derive in time, it may occur that major accident.Traditional method pump
Driving cycle water is cooling down.No. Hua Longyi of China's independent development waits Generation Ⅲ then to adopt passive safety system.
The Passive containment cooling system of nuclear power generating sets and passive spentnuclear fuel pond cooling system can adopt gravity loop heat pipe skill
Art, discharges reactor core decay heat by boiling, condensation process, realizes Natural Circulation using the density contrast between vapour-liquid, without the need for extraneous
Driving force.Passive reactor safety system adopts brand-new Nuclear Safety theory, represents the future of nuclear power technology.
Gravity type loop heat pipe include vaporizer, coagulator, tedge, down-comer and between header composition.At present
Gravity type loop heat pipe system design still according to traditional mentality of designing, give the operating temperature of loop heat pipe, will evaporation
Device and coagulator carry out separately designing separately as part, then carry out calculation and check.In fact, the work of gravity type loop heat pipe
Temperature is relevant with its structure, and each part is connected, and there is coupling each other, its independent design is calculated be beyond expression mutually it
Between relation, it is impossible to draw optimum results, it is impossible to realize optimal working condition.
The content of the invention
In order to solve the shortcoming of prior art, the first purpose of the purpose of the present invention is to provide a kind of gravity loop heat pipe system
The optimization method of running temperature.Loop heat pipe is considered as a total system by the method, by gravity type loop heat pipe from thermal source to
Low-temperature receiver is segmented according to heat transmission process, so the contact of heat transmission will be set up between vaporizer and coagulator, is passed through
Its heat transfer of COMPREHENSIVE CALCULATING and flow behavior, and the principle of optimality is introduced, one-time calculation just can directly obtain the work of loop heat pipe
Temperature.
A kind of optimization method of the gravity loop heat pipe system operating temperature of the present invention, including：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into into several heat
Amount transmission link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；Loop heat pipe thermal resistance network mould
Thermal resistance in type is the function of loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area；
Step 2：The thermal balance of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Constraints, it is optimum temperature to solve when the running temperature of loop heat pipe under the heat exchange area minimum of gravity loop heat pipe system
Degree；Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator
Outer wall area sum.
No matter the optimization method of the gravity loop heat pipe system operating temperature of the present invention is for which type of working media
It is all suitable for, for example：Water, ammonia, acetone etc..
Further, in the step 1, from thermal source to low-temperature receiver, heat transmission process is divided into into eight heat transmission rings
Heat transfer process between section, respectively thermal source and loop heat pipe vaporizer outer wall；The conduction process of heat pipe evaporator solid wall surface；Heat
The evaporation and heat-exchange process of pipe evaporator；Flow process of the heat pipe evaporator to steam between coagulator；The condensation of heat pipe coagulator is changed
Thermal process；The conduction process of heat pipe coagulator solid wall surface；Heat transfer process between heat pipe coagulator outer wall and low-temperature receiver；Along heat pipe
Solid wall surface is axially from vaporizer to the conduction process of coagulator.
Gravity type loop heat pipe is segmented from thermal source to low-temperature receiver by the present invention according to heat transmission process, so will evaporation
The contact of heat transmission is set up between device and coagulator, for design and the optimization tool of size of subsequent evaporation device and coagulator
It is significant, finally cause gravity type loop heat pipe to reach optimum Working.
Further, the thermal resistance in loop heat pipe thermal resistance network model is corresponding with a heat transmission link respectively.This
Each heat transmission link and a thermal resistance are entered row equivalent by invention, construct loop heat pipe thermal resistance network model, for asking
The minima of the heat exchange area of solution gravity loop heat pipe system, there is provided data basis.
Further, the thermal balance constraints of loop heat pipe recepting the caloric equal to the thermal discharge of coagulator for vaporizer.
As the primary constraints of gravity loop heat pipe system work is thermal balance, and due to vaporizer and condensation within the system
Device is most important two parts, therefore, in both parts a caloric receptivity is necessarily equal to the thermal discharge of another part.
Further, in the step 2, when solving the heat exchange area minimum of gravity loop heat pipe system, it is also contemplated that steam
Send out the area-constrained of device and coagulator.In order to more accurately ask for vaporizer and coagulator size, in addition it is also necessary to enter
One step ground is considered in whole gravity loop heat pipe system according to practical situation come to the area-constrained of vaporizer and coagulator.
The second purpose of the purpose of the present invention is to provide a kind of method for designing of gravity loop heat pipe system.The method is by loop
Heat pipe is considered as a total system, and gravity type loop heat pipe is segmented according to heat transmission process from thermal source to low-temperature receiver, this
Sample will set up the contact of heat transmission between vaporizer and coagulator, for design and the size of subsequent evaporation device and coagulator
Optimization it is significant, finally cause gravity type loop heat pipe to reach optimum Working；And COMPREHENSIVE CALCULATING its heat transfer
And flow behavior, and the principle of optimality being introduced, one-time calculation just can directly obtain the operating temperature of loop heat pipe and optimal
Vaporizer and coagulator physical dimension.
A kind of method for designing of the gravity loop heat pipe system of the present invention, including：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into into several heat
Amount transmission link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；Loop heat pipe thermal resistance network mould
Thermal resistance in type is the function of loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area；
Step 2：The thermal balance of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Constraints, it is optimum temperature to solve when the running temperature of loop heat pipe under the heat exchange area minimum of gravity loop heat pipe system
The minimum heat exchange area of degree and gravity loop heat pipe system；Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop
Heat pipe evaporator outer wall area and loop heat pipe coagulator outer wall area sum；
Step 3：Further according to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator outer wall Line Integral not with each
The relation of external diameter and length, obtains the optimum size of vaporizer and coagulator.
Beneficial effects of the present invention are：
The present invention loop heat pipe is considered as into a total system, by gravity type loop heat pipe from thermal source to low-temperature receiver according to heat
Transmitting procedure is segmented, and so the contact of heat transmission will be set up between vaporizer and coagulator, for subsequent evaporation device and
The design of coagulator and the optimization of size are significant, finally cause gravity type loop heat pipe to reach best effort shape
State；And its heat transfer of COMPREHENSIVE CALCULATING and flow behavior, and the principle of optimality is introduced, one-time calculation just can directly obtain loop heat pipe
Operating temperature and optimal vaporizer and coagulator physical dimension.
Description of the drawings
The Figure of description for constituting the part of the present invention is used for providing further understanding of the present application, and the present invention's shows
Meaning property embodiment and its illustrated for explaining the present invention, does not constitute inappropriate limitation of the present invention.
Fig. 1 is gravity loop heat pipe system structure diagram；
Fig. 2 is loop heat pipe thermal resistance network model；
Fig. 3 is a kind of optimization method flow chart of gravity loop heat pipe system operating temperature of the present invention；
Fig. 4 is a kind of method for designing flow chart of gravity loop heat pipe system of the present invention.
Specific embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the present invention.Unless another
Indicate, all technologies for using of the invention and scientific terminology are with logical with general technical staff of the technical field of the invention
The identical meanings for understanding
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
Fig. 1 is gravity loop heat pipe system structure diagram.As shown in figure 1, gravity loop heat pipe system is with passive peace
As a example by full shell cooling system.
The data center cooling system of the present embodiment has used the operation principle of separate heat pipe：
The evaporator section and condensation segment of separate heat pipe is separate, connects to be formed by vapor uptake with liquid down-comer
One natural convection loop.During work, in the vaporizer that the working medium in heat pipe is collected in, vaporizer is by indoor high temperature heat source
After (heat generating components of data center) heating, working medium evaporation, the steam of generation by vapor uptake arrival be located outside it is cold
Condenser discharges latent heat and condenses into liquid, and under gravity, Jing liquid down-comers return to vaporizer, and so move in circles fortune
OK.Whole circuit cycle does not need external motivating force, only forms Natural Circulation by the density contrast of ascent stage and descending branch, by steaming
Send out heat absorption and heat release is condensed by the heat derives of air in containment to containment outer water tank.To saturation after Water in Water Tank temperature rise
Evaporation, most at last in containment heat derives into ambient air.
As background technology is introduced, there is gravity type loop heat pipe operating temperature in prior art is had with its structure
Close, and each part be connected, there is coupling each other, its independent design is calculated the relation being beyond expression each other, it is impossible to
Draw optimum results, it is impossible to realize the deficiency of optimal working condition, in order to solve technical problem as above, the present invention is proposed
A kind of optimization method of gravity loop heat pipe system operating temperature.
Fig. 3 is a kind of optimization method flow chart of gravity loop heat pipe system operating temperature of the present invention.
A kind of optimization method of gravity loop heat pipe system operating temperature as shown in Figure 3, including：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into into several heat
Amount transmission link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；Loop heat pipe thermal resistance network mould
Thermal resistance in type is the function of loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area.
Loop heat pipe thermal resistance network model, as shown in Figure 2.It is the heat the low-temperature receiver of T2 from the thermal source that temperature is T1 to temperature
Amount transmitting procedure is made up of following eight links：(1) heat transfer process between thermal source and loop heat pipe vaporizer outer wall；(2) heat pipe
The conduction process of vaporizer solid wall surface；(3) evaporation (boiling) heat transfer process of heat pipe evaporator；(4) heat pipe evaporator is to solidifying
The flow process of steam between knot device；(5) the condensation heat transfer process of heat pipe coagulator；(6) heat conduction of heat pipe coagulator solid wall surface
Process；(7) heat transfer process between heat pipe coagulator outer wall and low-temperature receiver；(8) along heat pipe solid wall surface axially from vaporizer to solidifying
The conduction process of knot device.
Thermal resistance in loop heat pipe thermal resistance network model is corresponding with a heat transmission link respectively.
(1) heat exchanged thermoresistance R between thermal source and vaporizer outer wall1
This heat transfer link is external procedure for loop heat pipe, realizes that this link can be that heat conduction, convection current (include
Phase transformation) and radiation in one or two kinds of mode.If heat pipe evaporator outer wall area is Aeo, changing between outside wall surface and thermal source
Hot coefficient is α1, then thermal resistance R1Can calculate according to the following formula：
In formula, Aeo- heat pipe evaporator outer wall area, Aeo=π dole(doFor heat pipe external diameter, leIt is long for heat pipe evaporator
Degree).
(2) the thermal conduction resistance R of vaporizer solid wall2
In general, because the housing of heat pipe is all metal, and than relatively thin, mostly circular tube shaped, so this is led
The characteristic of hot link is relatively fixed, fairly simple.Its thermal resistance R2Can be calculated as the following formula：
In formula, the heat conductivity of λ-pipe wall material, W/ (mK)；
di- heat pipe internal diameter；
doFor heat pipe external diameter.
Work as do/di<When 2, R2Can calculate by following simplified formula：
In formula, dm- average diameter, dm=12do+di；
δm- average wall thickness, δm=12 δo+δi；
δi- heat pipe internal diameter wall thickness；
δoFor heat pipe external diameter wall thickness.
(3) evaporator evaporation (boiling) heat exchanged thermoresistance R3
This is a phase-change heat-exchange process, and the heat transfer intensity that evaporation (boiling) exchanges heat is at a relatively high.If set its coefficient of heat transfer as
α3, then thermal resistance R3Can be calculated as follows：
In formula, Aei- heat pipe evaporator outer wall area, Aei=π deile；
dei- heat pipe evaporator external diameter；
le- heat pipe evaporator length.
(4) from vaporizer to coagulator between steam flowing thermal resistance R4
Steam flow process is to realize that heat is passed by the mass transport of steam molecule in the loop heat pipe vapour tedge
It is defeated.If flow differential pressure very little, the temperature difference very little between vaporizer and coagulator, in most of the cases, it is believed that be
Isothermal.The thermal resistance can be calculated according to equivalent heat conductivity.
In formula, Δ T is the temperature difference between vaporizer and coagulator, DEG C；Q is thermic load kW/m2；hfgFor heat of vaporization, kJ/
kg；M is vaporizer and the vaporized media quality in coagulator.
(5) condensation heat transfer thermal resistance R of coagulator5
This is a phase-change heat-exchange process, and the heat transfer intensity of condensation heat transfer is also at a relatively high.If its coefficient of heat transfer is α5, then it is hot
Resistance R5Can be calculated as follows：
In formula, Aci- heat pipe coagulator inner wall area, Aci=π di lc；
di- heat pipe internal diameter；
lc- heat pipe coagulator length.
(6) the thermal conduction resistance R of coagulator solid wall6
Thermal resistance R6Can be calculated as the following formula：
In formula, the heat conductivity of λ-pipe wall material, W/ (mK)；
di- heat pipe internal diameter；
doFor heat pipe external diameter.
Work as do/di<When 2, R6Can calculate by following simplified formula：
In formula, dm- average diameter, dm=12do+di；
δm- average wall thickness, δm=12 δo+δi；
δi- heat pipe internal diameter wall thickness, m；
δoFor heat pipe external diameter wall thickness, m.
(7) heat exchanged thermoresistance R between coagulator outer wall and low-temperature receiver7
And the heat exchange link between heat pipe evaporator outer wall and thermal source is in the same manner, it is an external heat-exchanging process, can lead
Any one or two kinds in heat, three kinds of modes of convection current and radiation.Then thermal resistance R7Can calculate according to the following formula：
In formula, Aco- heat pipe coagulator outer wall area, Aco=π do lc；
do- heat pipe external diameter；
lc- heat pipe coagulator length.
(8) along heat pipe solid wall surface axially from vaporizer to the conduction process R of coagulator8
Due to exchanging heat, thickness of pipe wall is very thin, and has very long vapour phase pipeline to be connected from vaporizer to coagulator, and this conducts heat back
Can ignore on road, it is believed that R8=∞.
Further, as the thickness of pipe wall that exchanges heat is very thin, along heat pipe solid wall surface axially from vaporizer to the heat conduction of coagulator
Process heat transfer loop can be ignored, therefore, from thermal source to low-temperature receiver, heat transmission process is divided into into seven heat transmission links, point
Heat transfer process that Wei be between thermal source and loop heat pipe vaporizer outer wall；The conduction process of heat pipe evaporator solid wall surface；Heat pipe steams
Send out the evaporation and heat-exchange process of device；Flow process of the heat pipe evaporator to steam between coagulator；The condensation heat transfer mistake of heat pipe coagulator
Journey；The conduction process of heat pipe coagulator solid wall surface；Heat transfer process between heat pipe coagulator outer wall and low-temperature receiver.
To sum up analyze, system entire thermal resistance is：
System total heat transfer is：
Wherein, T1For heat source temperature；T2For sink temperature.
Step 2：The thermal balance of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Constraints, it is optimum temperature to solve when the running temperature of loop heat pipe under the heat exchange area minimum of gravity loop heat pipe system
Degree；Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator
Outer wall area sum.
In order to more accurately ask for vaporizer and coagulator size, in addition it is also necessary to further consider whole gravity
According to practical situation come to the area-constrained of vaporizer and coagulator in loop heat pipe system.In the step 2, weight is solved
When the heat exchange area of power loop heat pipe system is minimum, it is also contemplated that vaporizer and coagulator it is area-constrained.
The present invention loop heat pipe is considered as into a total system, by gravity type loop heat pipe from thermal source to low-temperature receiver according to heat
Transmitting procedure is segmented, and so the contact of heat transmission will be set up between vaporizer and coagulator, for subsequent evaporation device and
The design of coagulator and the optimization of size are significant, finally cause gravity type loop heat pipe to reach best effort shape
State；And its heat transfer of COMPREHENSIVE CALCULATING and flow behavior, and the principle of optimality is introduced, one-time calculation just can directly obtain loop heat pipe
Operating temperature and optimal vaporizer and coagulator physical dimension.
Fig. 4 is a kind of method for designing flow chart of gravity loop heat pipe system of the present invention.
A kind of method for designing of the gravity loop heat pipe system of the present invention, including：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into into several heat
Amount transmission link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；Loop heat pipe thermal resistance network mould
Thermal resistance in type is the function of loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area；
Loop heat pipe thermal resistance network model, as shown in Figure 2.It is the heat the low-temperature receiver of T2 from the thermal source that temperature is T1 to temperature
Amount transmitting procedure is made up of following eight links：(1) heat transfer process between thermal source and loop heat pipe vaporizer outer wall；(2) heat pipe
The conduction process of vaporizer solid wall surface；(3) evaporation (boiling) heat transfer process of heat pipe evaporator；(4) heat pipe evaporator is to solidifying
The flow process of steam between knot device；(5) the condensation heat transfer process of heat pipe coagulator；(6) heat conduction of heat pipe coagulator solid wall surface
Process；(7) heat transfer process between heat pipe coagulator outer wall and low-temperature receiver；(8) along heat pipe solid wall surface axially from vaporizer to solidifying
The conduction process of knot device.
Thermal resistance in loop heat pipe thermal resistance network model is corresponding with a heat transmission link respectively.Loop heat pipe thermal resistance
Thermal resistance in network model is respectively R1～R8。
Further, as the thickness of pipe wall that exchanges heat is very thin, along heat pipe solid wall surface axially from vaporizer to the heat conduction of coagulator
Process heat transfer loop can be ignored, therefore, from thermal source to low-temperature receiver, heat transmission process is divided into into seven heat transmission links, point
Heat transfer process that Wei be between thermal source and loop heat pipe vaporizer outer wall；The conduction process of heat pipe evaporator solid wall surface；Heat pipe steams
Send out the evaporation and heat-exchange process of device；Flow process of the heat pipe evaporator to steam between coagulator；The condensation heat transfer mistake of heat pipe coagulator
Journey；The conduction process of heat pipe coagulator solid wall surface；Heat transfer process between heat pipe coagulator outer wall and low-temperature receiver.
To sum up analyze, system entire thermal resistance is：
System total heat transfer is：
Wherein, T1For heat source temperature；T2For sink temperature.
Step 2：The thermal balance of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Constraints, it is optimum temperature to solve when the running temperature of loop heat pipe under the heat exchange area minimum of gravity loop heat pipe system
The minimum heat exchange area of degree and gravity loop heat pipe system；Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop
Heat pipe evaporator outer wall area and loop heat pipe coagulator outer wall area sum.
In order to more accurately ask for vaporizer and coagulator size, in addition it is also necessary to further consider whole gravity
According to practical situation come to the area-constrained of vaporizer and coagulator in loop heat pipe system.In the step 2, weight is solved
When the heat exchange area of power loop heat pipe system is minimum, it is also contemplated that vaporizer and coagulator it is area-constrained.
The present invention loop heat pipe is considered as into a total system, by gravity type loop heat pipe from thermal source to low-temperature receiver according to heat
Transmitting procedure is segmented, and so the contact of heat transmission will be set up between vaporizer and coagulator, for subsequent evaporation device and
The design of coagulator and the optimization of size are significant, finally cause gravity type loop heat pipe to reach best effort shape
State；And its heat transfer of COMPREHENSIVE CALCULATING and flow behavior, and the principle of optimality is introduced, one-time calculation just can directly obtain loop heat pipe
Operating temperature and optimal vaporizer and coagulator physical dimension.
Step 3：Further according to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator outer wall Line Integral not with each
The relation of external diameter and length, obtains the optimum size of vaporizer and coagulator.
The present invention loop heat pipe is considered as into a total system, by gravity type loop heat pipe from thermal source to low-temperature receiver according to heat
Transmitting procedure is segmented, and so the contact of heat transmission will be set up between vaporizer and coagulator, for subsequent evaporation device and
The design of coagulator and the optimization of size are significant, finally cause gravity type loop heat pipe to reach best effort shape
State；And its heat transfer of COMPREHENSIVE CALCULATING and flow behavior, and the principle of optimality is introduced, one-time calculation just can directly obtain loop heat pipe
Operating temperature and optimal vaporizer and coagulator physical dimension.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
The various modifications made by needing to pay creative work or deformation are still within protection scope of the present invention.
Claims (10)
1. a kind of optimization method of gravity loop heat pipe system operating temperature, it is characterised in that include：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into several heats to pass
Defeated link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；In loop heat pipe thermal resistance network model
Thermal resistance be loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area function；
Step 2：The thermal balance constraint of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Condition, it is Optimal Temperature to solve when the running temperature of loop heat pipe under the heat exchange area minimum of gravity loop heat pipe system；
Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator outer wall
Area sum.
2. a kind of optimization method of gravity loop heat pipe system operating temperature as claimed in claim 1, it is characterised in that in institute
State in step 1, from thermal source to low-temperature receiver, heat transmission process is divided into into eight heat transmission links, respectively thermal source and loop heat
Heat transfer process between pipe evaporator outer wall；The conduction process of heat pipe evaporator solid wall surface；The evaporation and heat-exchange mistake of heat pipe evaporator
Journey；Flow process of the heat pipe evaporator to steam between coagulator；The condensation heat transfer process of heat pipe coagulator；Heat pipe coagulator solid
The conduction process of wall；Heat transfer process between heat pipe coagulator outer wall and low-temperature receiver；Along heat pipe solid wall surface axially by vaporizer
To the conduction process of coagulator.
3. a kind of optimization method of gravity loop heat pipe system operating temperature as claimed in claim 2, it is characterised in that loop
Thermal resistance in heat pipe thermal resistance network model is corresponding with a heat transmission link respectively.
4. a kind of optimization method of gravity loop heat pipe system operating temperature as claimed in claim 1, it is characterised in that loop
The thermal balance constraints of heat pipe recepting the caloric equal to the thermal discharge of coagulator for vaporizer.
5. a kind of optimization method of gravity loop heat pipe system operating temperature as claimed in claim 1, it is characterised in that in institute
State in step 2, when solving the heat exchange area minimum of gravity loop heat pipe system, it is also contemplated that the area of vaporizer and coagulator is about
Beam.
6. a kind of method for designing of gravity loop heat pipe system, it is characterised in that include：
Step 1：Heat transmission process of the gravity loop heat pipe system between thermal source to low-temperature receiver is divided into several heats to pass
Defeated link, and then build the loop heat pipe thermal resistance network model of gravity loop heat pipe system；In loop heat pipe thermal resistance network model
Thermal resistance be loop heat pipe vaporizer outer wall area or loop heat pipe coagulator outer wall area function；
Step 2：The thermal balance constraint of loop heat pipe thermal resistance network model and loop heat pipe based on gravity loop heat pipe system
Condition, solve when gravity loop heat pipe system heat exchange area minimum under loop heat pipe running temperature be Optimal Temperature with
And the minimum heat exchange area of gravity loop heat pipe system；Wherein, the heat exchange area of gravity loop heat pipe system is equal to loop heat pipe
Vaporizer outer wall area and loop heat pipe coagulator outer wall area sum；
Step 3：Further according to loop heat pipe vaporizer outer wall area and loop heat pipe coagulator outer wall Line Integral not with respective external diameter
And the relation of length, obtain the optimum size of vaporizer and coagulator.
7. a kind of method for designing of gravity loop heat pipe system as claimed in claim 6, it is characterised in that in the step 1
In, from thermal source to low-temperature receiver, heat transmission process is divided into into eight heat transmission links, respectively thermal source and loop heat pipe vaporizer
Heat transfer process between outer wall；The conduction process of heat pipe evaporator solid wall surface；The evaporation and heat-exchange process of heat pipe evaporator；Heat pipe steams
Device is sent out to the flow process of steam between coagulator；The condensation heat transfer process of heat pipe coagulator；Heat pipe coagulator solid wall surface is led
Thermal process；Heat transfer process between heat pipe coagulator outer wall and low-temperature receiver；Along heat pipe solid wall surface axially from vaporizer to coagulator
Conduction process.
8. a kind of method for designing of gravity loop heat pipe system as claimed in claim 7, it is characterised in that loop heat pipe thermal resistance
Thermal resistance in network model is corresponding with a heat transmission link respectively.
9. a kind of method for designing of gravity loop heat pipe system as claimed in claim 6, it is characterised in that the heat of loop heat pipe
Equilibrium constraint recepting the caloric equal to the thermal discharge of coagulator for vaporizer.
10. a kind of method for designing of gravity loop heat pipe system as claimed in claim 6, it is characterised in that in the step 2
In, solve gravity loop heat pipe system heat exchange area it is minimum when, it is also contemplated that vaporizer and coagulator it is area-constrained.
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