CN105135709A - Intermediate-temperature solar flat plate collector with internal baffles - Google Patents
Intermediate-temperature solar flat plate collector with internal baffles Download PDFInfo
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- CN105135709A CN105135709A CN201510512740.8A CN201510512740A CN105135709A CN 105135709 A CN105135709 A CN 105135709A CN 201510512740 A CN201510512740 A CN 201510512740A CN 105135709 A CN105135709 A CN 105135709A
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- heat
- plate
- collector
- cover plate
- euphotic cover
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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
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Abstract
The invention discloses an intermediate-temperature solar flat plate collector with internal baffles. The multiple baffles (2) blocking natural convection are arranged between a light transmitting cover plate (1) and a heat absorbing plate core (3) and are arranged in the heat transfer fluid flowing direction (7), and the natural convection is prevented. The baffles (2) make contact with the heat absorbing plate core (3) or the light transmitting cover plate (1) but not make contact with the heat absorbing plate core (3) or the light transmitting cover plate (1) at the same time. The baffles (2) are arranged in the direction perpendicular to the light transmitting cover plate (1) or are obliquely placed. When the baffles (2) are obliquely placed, the included angle between the baffles (2) and the heat transfer fluid flowing direction (7) is larger than 90 degrees. The intermediate-temperature solar flat plate collector can be used in the solar intermediate temperature thermal utilization occasion.
Description
Technical field
The present invention relates to warm flat-plate solar collector in one.
Background technology
Solar energy is inexhaustible regenerative resource, reduces year by year, today that international energy situation is increasingly severe at fossil fuel, and developing solar energy is realize one of energy supply diversification, the important channel ensureing energy security.The operation principle of flat plate collector utilizes solar radiation to be radiated on heat-absorbing plate core, and the heat that absorber plate absorbs is taken away by the fluid being positioned at plate in-core.The heat loss of absorber plate comprises from absorber plate by the free convection of glass cover-plate that is located thereon and radiation loss; By the conductive heat loss of frame, by three parts such as the conductive heat losses of negative.At present because the optical property of dull and stereotyped heat dump absorption film is improved (absorptance 96% of blue film, transmitting ratio 6%), radiation heat loss is little.Wherein account for 70% of whole heat loss by the convection heat losses of euphotic cover plate.
The heat waste brought to suppress free convection, China is studied the key technology improving the flat plate collector thermal efficiency and achieves breakthrough.Last century the nineties, Chinese University of Science and Technology proposes the high-efficient flat-plate heat collector adopting Merlon honeycomb, and heat loss coefficient can drop to 2.5W/ (m
2and achieve Patents K).Silicate research institute of the Chinese Academy of Sciences also correspondingly have developed thickness and is less than 25 microns; the Merlon honeycomb ceramics that grid size is adjustable; but because transparent honeycomb cost is high; ascent modifying factor is low; seriously polluted to honeycomb of the dust entering heat collector inside due to respiration; the light transmittance of cellular material is declined, and therefore this honeycomb practical application effect is not good, is difficult to large-scale promotion.
Summary of the invention
The object of the invention is to reduce existing air collector euphotic cover plate heat loss, propose a kind of with temperature solar flat plate collector in internal baffle.The present invention, by the technological means of low cost, reduces the convection current heat waste of existing plate solar collector, thus improves flat plate collector collecting efficiency.The present invention can under middle temperature, and namely heat transfer fluid exit temperature reaches 80 ~ 120 DEG C, efficiently works.
Technical scheme of the present invention is as follows: a kind ofly comprise: euphotic cover plate, baffle plate, heat-absorbing plate core with temperature solar flat plate collector in internal baffle, framework and insulation material, heat collector entrance, and heat collector outlet.Be placed with heat-absorbing plate core under described euphotic cover plate, euphotic cover plate and heat-absorbing plate core surrounding are wrapped up by framework and insulation material, and insulation material is generally positioned at inside framework.Heat collector entrance and heat collector outlet lay respectively at bottom and the tip position of plate solar collector.When plate solar collector works, heat-transfer fluid enters the region between euphotic cover plate and heat-absorbing plate core from heat collector entrance, and is gradually heated by the sonochemical activity along heat-transfer fluid flowing direction, finally flows out from heat collector outlet.
Described baffle plate 2 is arranged between euphotic cover plate and heat-absorbing plate core, arranges along heat-transfer fluid flowing direction, plays a part to stop free convection to occur.
Described baffle plate can contact with heat-absorbing plate core or euphotic cover plate, but does not contact with euphotic cover plate with heat-absorbing plate core simultaneously.
Multiple described baffle plate can be equidistant layout along heat-transfer fluid flowing direction, also can be that unequal-interval is arranged.Arrange according to Unequal distance, the spacing between baffle plate reduces gradually along heat-transfer fluid flowing direction.
Described baffle plate can be placed perpendicular to the direction of euphotic cover plate, also can slant setting.Baffle plate and the heat-transfer fluid angle flowed between direction are greater than 90 °, reduce the reflex of heat collector to solar energy with this, increase effective solar radiation quantity of heat-absorbing plate core 3.
The material of described baffle plate can be light transmissive material also can be light-proof material.
The course of work of the present invention is as follows:
Solar radiation arrives heat-absorbing plate core through euphotic cover plate, and the heat of heat-absorbing plate core passes to the heat-transfer fluid of its internal flow: air or water.Heat convection flow field between the heat-absorbing plate core heated by solar radiation and euphotic cover plate is destroyed by baffle plate, form several little free convection flow field, the Rayleigh number of heat transfer free convection is declined, thus the NATURAL CONVECTION COEFFICIENT OF HEAT reduced between heat collector euphotic cover plate and heat-absorbing plate core, thus reduction heat loss coefficient, improve collecting efficiency.
Baffle plate can be equally spaced along the spacing in heat-transfer fluid flowing direction, also can be unequal-interval.Along heat collector length direction, in close heat collector porch, free convection driving force is low, spacing between baffle plate can be larger, along heat collector length direction, free convection driving force increases gradually, and the spacing between baffle plate should reduce gradually, in close heat collector exit, the spacing between baffle plate is minimum.
The present invention can effectively reduce convection current heat waste, and with low cost, easy to process, has good market-oriented prospect.
Accompanying drawing explanation
Heat collector sectional view along its length when Fig. 1 baffle plate is vertically placed;
Fig. 2 A-A sectional view;
Heat collector sectional view along its length during Fig. 3 baffle plate slant setting;
Fig. 4 B-B sectional view;
In figure: 1 euphotic cover plate; 2 baffle plates; 3 heat-absorbing plate cores; 4 frameworks and insulation material; 5 heat collector entrances; 6 heat collector outlets; 7 heat-transfer fluid flowing directions.
Detailed description of the invention
Below in conjunction with the present invention of the drawings and specific embodiments further instruction.
As shown in Figure 1 and Figure 2, plate solar collector of the present invention comprises: euphotic cover plate 1, baffle plate 2, heat-absorbing plate core 3, framework and insulation material 4, heat collector entrance 5 and heat collector outlet 6.Euphotic cover plate is placed with heat-absorbing plate core 31 time, and euphotic cover plate 1 and heat-absorbing plate core 3 surrounding are wrapped up by framework and insulation material 4, and insulation material is generally positioned at inside framework.Heat collector entrance 5 and heat collector outlet 6 are positioned at bottom and the tip position of plate solar collector.When plate solar collector works, heat-transfer fluid enters the region between euphotic cover plate 1 and heat-absorbing plate core 3 from heat collector entrance 5, and is gradually heated by the sonochemical activity along heat-transfer fluid flowing direction 7, finally flows out from heat collector outlet 6.
Described baffle plate 2 is arranged between euphotic cover plate 1 and heat-absorbing plate core 3, arranges along heat-transfer fluid flowing direction 7, plays a part to stop free convection to occur.Described baffle plate 2 can contact with heat-absorbing plate core 3 or euphotic cover plate 1, but does not contact with euphotic cover plate 1 with heat-absorbing plate core 3 simultaneously, in order to avoid form heat bridge between heat-absorbing plate core 3 and euphotic cover plate 1, increases heat waste.
Multiple described baffle plate 2 equidistantly arranges along heat-transfer fluid flowing direction 7 or unequal-interval is arranged.If Unequal distance is arranged, along heat-transfer fluid flowing direction 7, free convection driving force strengthens gradually, and the spacing between baffle plate 2 reduces gradually.
Baffle plate 2 of the present invention can perpendicular to the direction of euphotic cover plate 1, also can slant setting, baffle plate 2 and the heat-transfer fluid angle flowed between direction 7 are greater than 90 °, as shown in Figure 3, Figure 4, to reduce the volume reflection of heat collector to solar energy, thus increase the solar radiation amount falling into heat-absorbing plate core 3.
The material of baffle plate 2 of the present invention can be chosen according to actual conditions, both can be light transmissive material, and also can be light-proof material.
Operation principle of the present invention is: solar irradiation arrives heat-absorbing plate core 3 through glass cover-plate 1, and heat-absorbing plate core 3 is heated, and its temperature is higher than euphotic cover plate 1.Therefore, free convection is formed in the air blanketing between euphotic cover plate 1 and heat-absorbing plate core 3.After air-flow runs into baffle plate 2, flow velocity reduces or flow stagnation, thus reduces convection transfer rate, namely reduces convection heat transfer intensity, is finally reduced by the convection current heat waste of euphotic cover plate 1.
Outstanding advantages of the present invention is: by increasing the mode of baffle plate 2 along heat-transfer fluid flowing direction 7, effectively can reduce the convection heat transfer intensity between euphotic cover plate 1 and heat-absorbing plate core 3, reduce convection current heat waste, and with low cost, easy to process, there is good market-oriented prospect.
Claims (6)
1. with a temperature solar flat plate collector in internal baffle, described plate solar collector comprises: euphotic cover plate (1), heat-absorbing plate core (3), framework and insulation material (4), heat collector entrance (5) and heat collector outlet (6); Be placed with heat-absorbing plate core (3) under euphotic cover plate (1), euphotic cover plate (1) and heat-absorbing plate core (3) surrounding are wrapped up by framework and insulation material (4), and insulation material is positioned at inside framework; Heat collector entrance (5) and heat collector outlet (6) are positioned at bottom and the tip position of plate solar collector, it is characterized in that: described plate solar collector is provided with the baffle plate (2) that multiple prevention free convection occurs between euphotic cover plate (1) and heat-absorbing plate core (3), described baffle plate (2) is arranged along heat-transfer fluid flowing direction (7).
2. according to according to claim 1 with temperature solar flat plate collector in internal baffle, it is characterized in that: described baffle plate (2) contacts with heat-absorbing plate core (3) or euphotic cover plate (1), but contact with euphotic cover plate (1) with heat-absorbing plate core (3) time different.
3. according to according to claim 1 with temperature solar flat plate collector in internal baffle, it is characterized in that: described baffle plate (2) is arranged perpendicular to the direction of euphotic cover plate (1).
4. according to according to claim 1 with temperature solar flat plate collector in internal baffle, it is characterized in that: described baffle plate (2) slant setting; When slant setting, the angle that baffle plate (2) and heat-transfer fluid flow between direction (7) is greater than 90 °.
5. according to according to claim 1 with temperature solar flat plate collector in internal baffle, it is characterized in that: multiple described baffle plate (2) is equidistantly arranged along heat-transfer fluid flowing direction (7).
6. according to according to claim 1 with temperature solar flat plate collector in internal baffle, it is characterized in that: multiple described baffle plate (2) unequal-interval is arranged, the spacing between baffle plate reduces gradually along heat-transfer fluid direction (7) of flowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512740.8A CN105135709A (en) | 2015-08-19 | 2015-08-19 | Intermediate-temperature solar flat plate collector with internal baffles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512740.8A CN105135709A (en) | 2015-08-19 | 2015-08-19 | Intermediate-temperature solar flat plate collector with internal baffles |
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| Publication Number | Publication Date |
|---|---|
| CN105135709A true CN105135709A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510512740.8A Pending CN105135709A (en) | 2015-08-19 | 2015-08-19 | Intermediate-temperature solar flat plate collector with internal baffles |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111998545A (en) * | 2020-09-01 | 2020-11-27 | 宁波盾科新材料有限公司 | Surface contact flat-plate solar collector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2317445Y (en) * | 1998-03-20 | 1999-05-05 | 中国科学院广州能源研究所 | High efficient plate solar heat collector |
| CN202149622U (en) * | 2011-07-05 | 2012-02-22 | 中国科学院广州能源研究所 | Solar flat plate collector with high heat resistance |
| CN202955882U (en) * | 2012-11-03 | 2013-05-29 | 湖南兴业太阳能科技有限公司 | Anti-idle-sunning flat-plate solar collector |
| CN103216953A (en) * | 2013-04-16 | 2013-07-24 | 广州粤海真空技术有限公司 | Flat plate solar heat collector |
| CN203177495U (en) * | 2013-03-27 | 2013-09-04 | 山东鑫乐新能源科技有限公司 | Medium temperature type flat-plate solar collector |
| CN204227719U (en) * | 2014-10-13 | 2015-03-25 | 天普新能源科技有限公司 | Large scale plate solar collector |
-
2015
- 2015-08-19 CN CN201510512740.8A patent/CN105135709A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2317445Y (en) * | 1998-03-20 | 1999-05-05 | 中国科学院广州能源研究所 | High efficient plate solar heat collector |
| CN202149622U (en) * | 2011-07-05 | 2012-02-22 | 中国科学院广州能源研究所 | Solar flat plate collector with high heat resistance |
| CN202955882U (en) * | 2012-11-03 | 2013-05-29 | 湖南兴业太阳能科技有限公司 | Anti-idle-sunning flat-plate solar collector |
| CN203177495U (en) * | 2013-03-27 | 2013-09-04 | 山东鑫乐新能源科技有限公司 | Medium temperature type flat-plate solar collector |
| CN103216953A (en) * | 2013-04-16 | 2013-07-24 | 广州粤海真空技术有限公司 | Flat plate solar heat collector |
| CN204227719U (en) * | 2014-10-13 | 2015-03-25 | 天普新能源科技有限公司 | Large scale plate solar collector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111998545A (en) * | 2020-09-01 | 2020-11-27 | 宁波盾科新材料有限公司 | Surface contact flat-plate solar collector |
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Application publication date: 20151209 |
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