CN108332436A - A kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating - Google Patents
A kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating Download PDFInfo
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- CN108332436A CN108332436A CN201810223825.8A CN201810223825A CN108332436A CN 108332436 A CN108332436 A CN 108332436A CN 201810223825 A CN201810223825 A CN 201810223825A CN 108332436 A CN108332436 A CN 108332436A
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- thermal
- auxiliary
- collecting tube
- phase
- standpipe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
Abstract
The present invention relates to a kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating, which includes that the solar energy of collection is transmitted to main heat collector by auxiliary heat collector and main heat collector, the auxiliary heat collector through phase-change working substance；The auxiliary heat collector includes auxiliary heat accumulator, auxiliary thermal-collecting tube, phase-change working substance deposit box, standpipe outer layer, standpipe internal layer, throttle valve and connector, phase-change working substance is filled in the auxiliary thermal-collecting tube, auxiliary thermal-collecting tube is horizontally placed at the focal line of auxiliary heat accumulator, assist thermal-collecting tube closed at both ends, phase-change working substance deposit box is connect with auxiliary thermal-collecting tube, and several connectors are provided on position corresponding with outer layer glass tube bottom side openings at the top of auxiliary thermal-collecting tube.The system structure is simple, can increase the efficiency of solar energy utilization, improves the temperature upper limit of heating speed and working medium heating, while can control temperature in safe range.
Description
Technical field
The present invention relates to a kind of field of solar energy utilization, and in particular to a kind of groove type solar hot water of phase transformation auxiliary heating
Device collecting system.
Background technology
With energy growing tension in world wide, problem of environmental pollution getting worse, more and more experts and scholars will
Sight turns to the utilization of the green energy resources such as solar energy, thus trough type solar water heater heat-collecting system is come into being.
Trough type solar water heater heat-collecting system, major working range are 40-60 DEG C, have extensive market prospects.
Existing trough type solar water heater heat-collecting system primary structure has：Slot-type optical collector, evacuated collector tube etc., to solar energy utilization ratio
Not high, thermal-arrest rate is low, and the attainable temperature upper limit of institute is relatively low (existing temperature upper limit is 60 DEG C or so).Patent No.
The patent of 201621397484.9 " a kind of biaxial tracking trough-type solar thermal collector ", structure is complex, installation requirement and
Required cost is higher, and enforcement difficulty is big；Application No. is the patent of 201611251799.7 " a kind of trough type solar heat-collector ",
Solar energy only is absorbed by absorber coatings, relatively low to solar energy utilization ratio, thermal-arrest rate is not high, equally causes the increasing of production cost
Add.Application No. is the patent of 201610001585.8 " focusing-type solar energy medium temperature phase change heat accumulator ", phase transformation generation area
Non-dismountable, thermal-arrest rate is difficult to be controlled, and has prodigious security risk, and phase-change working substance is in heat exchange pipe week always
It encloses, can absorb heat from comb tube wall when undergoing phase transition, it is not high so as to cause device heat utilization ratio.
Invention content
It is an object of the invention to overcome solar energy utilization ratio of the existing technology low, heating speed is slow, vacuumizes difficulty
The defects such as big, of high cost, business efficiency is low are spent, a kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating is provided.
This new and effective trough type solar water heater heat-collecting system, is not only simple in structure, can increase the utilization ratio of solar energy, carry
The temperature upper limit of high heating speed and working medium heating, while temperature can be controlled in safe range, and overcome vacuum
The problem of pipe processing, can reduce cost, improve business efficiency.
For achieving the above object, the present invention uses new principle and new technology, assists heating in conjunction with phase change structure.It is carried
The technical solution of confession is：A kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating, it is characterised in that the system packet
It includes auxiliary heat collector and the solar energy of collection is transmitted to main collection by main heat collector, the auxiliary heat collector through phase-change working substance
Thermal；
The main heat collector includes slot-type optical collector, casing thermal-collecting tube, described sleeve pipe thermal-collecting tube include outer layer glass tube,
Surface is coated with the inner layer metal pipe for absorbing solar energy coating, and outer layer glass tube is overlapped with the central axes of inner layer metal pipe, outer layer glass
Glass tube bottom side is provided with several openings, and casing thermal-collecting tube is arranged on the focal line of slot-type optical collector, the non-envelope in casing thermal-collecting tube both ends
It closes, is flowed by inner layer metal pipe one end by heating working medium, flowed out by the inner layer metal pipe other end；
The auxiliary heat collector includes auxiliary heat accumulator, auxiliary thermal-collecting tube, phase-change working substance deposit box, standpipe outer layer, stands
Inner tube layer, throttle valve and connector, phase-change working substance is filled in the auxiliary thermal-collecting tube, and auxiliary thermal-collecting tube is horizontally placed at auxiliary thermal-arrest
At the focal line of slot, auxiliary thermal-collecting tube is closed at both ends, and phase-change working substance deposit box is connect with auxiliary thermal-collecting tube, and auxiliary thermal-collecting tube top exists
Several connectors, the company of standpipe outer layer one end and auxiliary thermal-collecting tube are provided on position corresponding with outer layer glass tube bottom side openings
Interface vertical connection, the other end pass through bolt vertical connection with the corresponding bottom side openings of outer layer glass tube；Standpipe internal layer is nested in
It in standpipe outer layer, and is connected and fixed by connector, the throttle valve of control flow is set in standpipe internal layer；Standpipe internal layer and standpipe
Outer layer constitutes standpipe.
The application principle of the present invention is as follows：
The present invention absorbs solar energy using auxiliary heat collector, and phase-change working substance is made to be vaporized into assisting thermal-collecting tube containing big
The steam for measuring the latent heat of vaporization, in the outer layer glass tube by standpipe internal layer sleeve pipe thermal-collecting tube, in casing thermal-arrest inner tube layer gold
Belong to tube wall liquefaction, after transferring heat to the working medium for flowing through inner layer metal pipe, auxiliary thermal-collecting tube is flowed back to by standpipe outer layer, is formed
One closed Natural Circulation, is arranged throttle valve on standpipe internal layer, to control thermal-arrest rate, when assisting working medium in heating tube
When evaporating excessive, phase-change working substance is supplemented to it by phase-change working substance deposit box.
Compared with prior art, beneficial effects of the present invention are as follows：
The present invention substantive distinguishing features outstanding be：On the basis of existing heat collector, supplementary set hot charging is added
It sets, by assisting heat collector to absorb more solar energy, and in such a way that phase-change working substance discharges the latent heat of vaporization, by heat transfer
To by heating working medium, the rate of heat addition and temperature upper limit is made to be significantly improved, it is (more existing than existing trough type solar heat-collector
Trough type solar water heater heat-collecting system includes holder, mirror surface and evacuated collector tube, and evacuated collector tube is usually through type
Metal-glass vaccum heat-collecting tube.Through type metal-glass vaccum heat-collecting tube is the metal heat absorption tube and outer glass tube of both ends open
The outer wall of the concentric tubes of composition, metal heat absorption tube has absorber coatings.) thermal efficiency is high by 58.8% or more；Assist heat collector can
By the throttle valve control steam flow of standpipe internal layer, and then control whole thermal-arrest rate and the thermal efficiency；Phase-change working substance is saved
The connecting pipe of case and auxiliary thermal-collecting tube is equipped with valve, is controllable device；Auxiliary heat collector passes through spiral shell with main heat collector
Bolt is attached, detachable in the case where space is limited or thermal-arrest rate requirement is not high, only with main heat collector.
The present invention marked improvement be：
The temperature upper limit of present system can reach nearly 100 DEG C, increase on the basis of existing trough-type water heater collecting system
An auxiliary device is added, which can provide additional heat, be readily disassembled, and be also easy to control heating temperature；Due to this
The thermal-arrest rate of application greatly improves, and can be the economic interests that enterprise creates bigger；Auxiliary thermal-collecting tube is no longer in the application
Bimetallic tube, but the common horizontal tube of a storage phase-change working substance, closed at both ends, intraductal working medium does not flow.Casing thermal-collecting tube
No longer it is vacuum between inner and outer pipes, but allows phase-change working substance to be evaporated in outer tube and discharge the latent heat of vaporization.
The present invention is not only simple in structure, can increase solar energy utilization rate, the technical barrier for avoiding vacuum tube from processing, simultaneously
The inner tube layer that can be opposed by throttle valve carries out flow control, and then by temperature control in safe range, whole process no pollution
Discharge has the higher efficiency of heating surface and good economic results in society.
Description of the drawings
Fig. 1 is the structural schematic diagram of the trough type solar water heater heat-collecting system of phase transformation auxiliary heating of the present invention；
Reference sign：1- assists heat accumulator, 2- auxiliary thermal-collecting tube, 3- phase-change working substances deposit box, 4- valves, 5- phase transformations
Working medium, 6- standpipes internal layer, 7- standpipes outer layer, 8- throttle valves, 9- connectors, 10- slot-type optical collectors, 11- coatings, 12- internal layer gold
Belong to pipe, 13- outer layer glass tubes, 14- bolts.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples, but is not protected in this, as the application claim
Protect the restriction of range.
A kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating of the present invention includes auxiliary heat collector (Fig. 1
Middle 1-9) and main heat collector (10-13 in Fig. 1), the auxiliary heat collector (1-9 in Fig. 1) is by the solar energy of collection through phase transformation
Working medium 5 is transmitted to main heat collector (10-13 in Fig. 1).
The main heat collector includes slot-type optical collector 10, casing thermal-collecting tube (12-13 in Fig. 1), described sleeve pipe thermal-collecting tube
The inner layer metal pipe 12 for absorbing solar energy coating 11, outer layer glass tube 13 and internal layer gold are coated with including outer layer glass tube 13, surface
The central axes for belonging to pipe 12 overlap, and 13 bottom side of outer layer glass tube is provided with several openings, and casing thermal-collecting tube is arranged in slot-type optical collector
On focal line, casing thermal-collecting tube both ends non-close is flowed by heating working medium by 12 one end of inner layer metal pipe, by inner layer metal pipe 12
The other end flows out；
The auxiliary heat collector include auxiliary heat accumulator 1, auxiliary thermal-collecting tube 2, phase-change working substance deposit box 3, standpipe outer layer,
Standpipe internal layer, throttle valve 8 and connector 9, phase-change working substance 5 is filled in the auxiliary thermal-collecting tube 2, and auxiliary thermal-collecting tube 2 is horizontally placed at
At the focal line for assisting heat accumulator 1, auxiliary thermal-collecting tube 2 is closed at both ends, and phase-change working substance deposit box 3 is connect with auxiliary thermal-collecting tube 2, is assisted
The top of thermal-collecting tube 2 is provided with several connectors on position corresponding with outer layer glass tube bottom side openings, standpipe outer layer one end with
The connector vertical connection of thermal-collecting tube 2, the other end is assisted to connect by the way that bolt 14 is vertical with the corresponding bottom side openings of outer layer glass tube
It connects；Standpipe internal layer 6 is nested in standpipe outer layer 7, and is connected and fixed by connector 9, and control flow is arranged in standpipe internal layer 6
Throttle valve 8；Standpipe internal layer and standpipe outer layer constitute standpipe.
Further characteristic of the invention is that the auxiliary heat accumulator 1 is the slot light collection for capableing of foucusing solar radiation energy
Device.
Further characteristic of the invention is that valve is arranged on the pipeline for assisting thermal-collecting tube 2 to connect in phase-change working substance deposit box 3
Door 4 is controlled by valve, is mended by phase-change working substance deposit box 3 when assisting the phase-change working substance in thermal-collecting tube to evaporate excessive
It fills；The application can also select phase-change working substance deposit box to be configured by law of connected vessels about between auxiliary thermal-collecting tube, when
The very few phase-change working substance deposit box that can be automatically controlled due to pressure action of phase-change working substance is auxiliary thermal-collecting tube supplement in auxiliary thermal-collecting tube
Phase-change working substance.
Further characteristic of the invention is that it is a horizontal straight tube structure to assist thermal-collecting tube 2, and cross section is rectangle, circle
Shape, ellipse or similar geometry topological structure.With the evaporation of phase-change working substance, liquid level can change, and assist the shape of thermal-collecting tube
Shape can influence the geometric dimension of liquid level, and then influence and control evaporation rate.
The standpipe uses sleeve structure, and both perpendicular to auxiliary thermal-collecting tube and casing thermal-collecting tube, radical is 4~10,
A diameter of 10~800mm；Holding is vertically for the ease of installation, and resistance when reduction steam rising.
Phase-change working substance in the auxiliary thermal-collecting tube is undergone phase transition through absorbing the solar energy of auxiliary heat accumulator aggregation, by vertical
Pipe reaches in the outer layer glass tube of casing thermal-collecting tube, is transferred heat to and is flowed through in casing thermal-collecting tube by convection current heat transfer and heat conduction
The working medium of layer forms a closed Natural Circulation；
A kind of operation principle of the trough type solar water heater heat-collecting system of present invention phase transformation auxiliary heating is：
By assisting heat collector (1-9 in Fig. 1) to absorb solar energy, phase-change working substance 5 is made to be vaporized into assisting thermal-collecting tube 2
For the steam containing a large amount of latent heats of vaporization, in outer layer glass tube 13 of the steam by 6 sleeve pipe thermal-collecting tube of standpipe internal layer, inside
Layer 12 wall of metal tube liquefaction, after amount of heat to be passed to the working medium for flowing through inner layer metal pipe 12, is flowed back to auxiliary by standpipe outer layer 7
Thermal-collecting tube 2 is helped, a closed Natural Circulation is formed.When the temperature is excessively high, it can be reduced and be imitated by throttle valve 8 when by heating working medium
Rate can be supplemented when assisting the phase-change working substance 5 in thermal-collecting tube 2 to evaporate excessive by phase-change working substance deposit box 3.
Heretofore described standpipe internal layer is equipped with the throttle valve that can control temperature, and standpipe is set as standpipe internal layer and standpipe
The sleeve structure of this nesting of outer layer, it is desirable to which steam is got on by internal layer, is got off by outer layer after liquefaction, and steam and liquid are avoided
It directly meets, reduces vapor (steam) temperature.Do not have to be evacuated between outer layer glass tube 13 and inner layer metal pipe 12, solves vacuum tube and add
The technical barrier of work, reduces cost.
For the present invention due to by heating working medium being constant flow in main heat collector, it is few to absorb heat, and assists thermal-collecting tube
In phase-change working substance be it is immobilising, can be with constant absorption heat, temperature rapid increase, so temperature can be higher than main heat-collecting temperature
And provide heat for it.Heat collector is assisted, by the phase transformation of phase-change working substance 5, to transfer energy to and heated with main heat collector
Working medium increases the utilization rate of solar energy, improves thermal-arrest rate.
Embodiment 1
A kind of trough type solar water heater heat-collecting system of the present embodiment phase transformation auxiliary heating include auxiliary heat collector and
The solar energy of collection is transmitted to main heat collector by main heat collector, the auxiliary heat collector through phase-change working substance 5.
The auxiliary heat collector includes auxiliary heat accumulator 1, auxiliary thermal-collecting tube 2, phase-change working substance deposit box 3, valve 4, stands
Pipe, throttle valve 8 and connector 9 fill phase-change working substance 5 in the auxiliary thermal-collecting tube 2, are placed in and assist at 1 focal line of heat accumulator, phase transformation
Working medium deposit box 3 is connect with auxiliary thermal-collecting tube 2, and standpipe internal layer 6 is connect with standpipe outer layer 7 by connector 9.
The main heat collector includes slot-type optical collector 10, casing thermal-collecting tube, and described sleeve pipe thermal-collecting tube includes glass outer
Pipe 13, surface are coated with the inner layer metal pipe 12 for absorbing solar energy coating 11, and two pipe central axes overlap, and 13 bottom side of outer layer glass tube is opened
Mouthful.
Described 7 one end of standpipe outer layer and auxiliary 2 vertical connection of thermal-collecting tube, the outer layer glass tube of the other end and casing thermal-collecting tube
13 by 14 vertical connection of bolt, and the throttle valve 8 of control flow is arranged in standpipe internal layer 6.
Main heat collector described in the present embodiment takes the existing groove type heat collector device of unit length；The auxiliary heat accumulator
For slot-type optical collector, length 2m；Auxiliary thermal-collecting tube is a cuboid pipe, and geometric dimension is：2m×0.5m×1m；The standpipe
Radical is 4, a diameter of 80mm of standpipe outer layer；The phase-change working substance is water.
By taking Beijing as an example, summer, instantaneous solar irradiation intensity was about 800w/m2, the heat collector surface of the main heat collector of unit length
Product is about 2.25m2, collecting efficiency is about 63%.
When it is 40 DEG C to assist the temperature of water in thermal-collecting tube, then the whole thermal efficiency about improves 58.8%；If assisting thermal-collecting tube
The temperature of middle water reaches 80 DEG C, then the whole thermal efficiency about improves 136%.
Embodiment 2
A kind of trough type solar water heater heat-collecting system components of phase transformation auxiliary heating of the present embodiment connect same embodiment
1, the difference is that, it is slot-type optical collector, length 4m that heat accumulator is assisted described in the present embodiment；The auxiliary thermal-collecting tube is horizontal
Section is circle, a length of 4m, a diameter of 1m；The standpipe radical is 8, a diameter of 100mm of standpipe outer layer；The phase-change working substance
For water.
By taking Beijing as an example, winter, instantaneous solar irradiation intensity was about 200w/m2, the heat collector surface of the main heat collector of unit length
Product is about 2.25m2, collecting efficiency is about 63%.
When it is 4 DEG C to assist the temperature of water in thermal-collecting tube, then the whole thermal efficiency about improves 174.9%；If assisting thermal-collecting tube
The temperature of middle water reaches 20 DEG C, then the whole thermal efficiency about improves 657.3%.
The main heat collector of embodiment 1 and embodiment 2 is same to be taken as unit length, and the slave part size of embodiment 2 is wanted
It is more much larger than embodiment 1.The calculating process of two examples is as follows：
Embodiment 1：The caloric receptivity of main heat collector in 1 second：800w/m2×2.25m2× 63%=1134J,
The heat for assisting heat collector to provide in 1 second：40 DEG C of water surface evaporation rates × water evaporation surface area × 40 DEG C water
Evaporation latent heat=666.792J
The whole thermal efficiency improves：666.792J/1134J=58.8%
Embodiment 2：The caloric receptivity of main heat collector in 1 second：200w/m2×2.25m2× 63%=283.5J
The heat of the offer of heat collector is provided in 1 second：4 DEG C of water surface evaporation rates × water evaporation surface area × 4 DEG C water
Evaporation latent heat=496J
The whole thermal efficiency improves：496J/283.5J=174.9%.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the transformation that can readily occur in and replace and
Improve, all belong to the scope of protection of the present invention within.
The present invention does not address place and is suitable for the prior art.
Claims (5)
1. a kind of trough type solar water heater heat-collecting system of phase transformation auxiliary heating, it is characterised in that the system includes auxiliary thermal-arrest
The solar energy of collection is transmitted to main heat collector by device and main heat collector, the auxiliary heat collector through phase-change working substance；
The main heat collector includes slot-type optical collector, casing thermal-collecting tube, and described sleeve pipe thermal-collecting tube includes outer layer glass tube, surface
It is coated with the inner layer metal pipe for absorbing solar energy coating, outer layer glass tube is overlapped with the central axes of inner layer metal pipe, outer layer glass tube
Bottom side is provided with several openings, and casing thermal-collecting tube is arranged on the focal line of slot-type optical collector, casing thermal-collecting tube both ends non-close, quilt
Heating working medium is flowed by inner layer metal pipe one end, is flowed out by the inner layer metal pipe other end；
The auxiliary heat collector is including in auxiliary heat accumulator, auxiliary thermal-collecting tube, phase-change working substance deposit box, standpipe outer layer, standpipe
Layer, throttle valve and connector fill phase-change working substance in the auxiliary thermal-collecting tube, and auxiliary thermal-collecting tube, which is horizontally placed at, assists heat accumulator
At focal line, auxiliary thermal-collecting tube it is closed at both ends, phase-change working substance deposit box with auxiliary thermal-collecting tube connect, assist thermal-collecting tube top with it is outer
Several connectors, the connector of standpipe outer layer one end and auxiliary thermal-collecting tube are provided on the corresponding position of layer glass tube bottom side openings
Vertical connection, the other end pass through bolt vertical connection with the corresponding bottom side openings of outer layer glass tube；Standpipe internal layer is nested in standpipe
It in outer layer, and is connected and fixed by connector, the throttle valve of control flow is set in standpipe internal layer；Standpipe internal layer and standpipe outer layer
Constitute standpipe.
2. the trough type solar water heater heat-collecting system of phase transformation auxiliary heating according to claim 1, it is characterised in that institute
It is the slot-type optical collector for capableing of foucusing solar radiation energy to state auxiliary heat accumulator.
3. the trough type solar water heater heat-collecting system of phase transformation auxiliary heating according to claim 1, it is characterised in that phase
Become working medium deposit box and valve is set on the pipeline for assisting thermal-collecting tube to connect.
4. the trough type solar water heater heat-collecting system of phase transformation auxiliary heating according to claim 1, it is characterised in that auxiliary
It is a horizontal straight tube structure to help thermal-collecting tube, and cross section is rectangle, circle, ellipse.
5. the trough type solar water heater heat-collecting system of phase transformation auxiliary heating according to claim 1, it is characterised in that institute
It states standpipe and uses sleeve structure, both perpendicular to auxiliary thermal-collecting tube and casing thermal-collecting tube, radical is 4~10, a diameter of 10 ~
800mm。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810223825.8A CN108332436B (en) | 2018-03-19 | 2018-03-19 | Trough type solar water heater heat collection system with phase change auxiliary heating function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810223825.8A CN108332436B (en) | 2018-03-19 | 2018-03-19 | Trough type solar water heater heat collection system with phase change auxiliary heating function |
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| CN108332436B CN108332436B (en) | 2023-06-27 |
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| CN108332436B (en) | 2023-06-27 |
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