[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP2386048A2 - Textile based air heater solar collector - Google Patents

Textile based air heater solar collector

Info

Publication number
EP2386048A2
EP2386048A2 EP09741482A EP09741482A EP2386048A2 EP 2386048 A2 EP2386048 A2 EP 2386048A2 EP 09741482 A EP09741482 A EP 09741482A EP 09741482 A EP09741482 A EP 09741482A EP 2386048 A2 EP2386048 A2 EP 2386048A2
Authority
EP
European Patent Office
Prior art keywords
fabric
air
collector
textile
black
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09741482A
Other languages
German (de)
French (fr)
Inventor
Isik Tarakcioglu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2386048A2 publication Critical patent/EP2386048A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00Solar heat collectors using working fluids
    • F24S10/80Solar heat collectors using working fluids comprising porous material or permeable masses directly contacting the working fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S2080/01Selection of particular materials
    • F24S2080/016Textiles; Fabrics
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems

Definitions

  • This invention relates to textile based solar collector that ensures hot air production for heating or drying operations.
  • Fossil-based fuels are not renewable resources and therefore they will run out after a certain period of time.
  • the global warming occurring by the greenhouse effect due to carbon dioxide emissions generated by the combustion of fossil-fuels has increased the importance of the alternative energy resources.
  • Solar energy has the easiest and most common available use in the renewable and clean energy sources such as hydroelectric, solar, wind, geothermal, etc.
  • Air heater solar energy collectors are based on a black-colored metallic, plastic, ceramic or composite plate; placed inside a box in the form of a rectangular prism made of metallic, plastic or composite material.
  • the back and side surfaces of the rectangular box are insulated and the upper surface (sun seeing surface) is covered with a normal or special glass, polycarbonate or other transparent layer.
  • the black plate heated by the absorption of high-IR radiation of sun rays heats the air to a limited extent in the box, in which a green house effect occurs.
  • the air heater collectors especially in case of moving air, this is the case in the air heater collectors; the actual heat transfer takes place by convection.
  • the amount of heat transfer rate is proportional to the surface area of heat transfer.
  • the heat transfer efficiency is aimed to be increased by several constructions by providing the contact of the air with the both sides of the black plate, using finned plates of one or both sides, perforated plates or special black plates with rough surface structures, creating a meander type passing route for the air to extend the contact path with the hot plate, placing of metallic networks between the transparent layer and the black plate, etc.
  • the purpose of the invention is to increase the heat transfer rate from the black absorber plate to the air to be heated.
  • Q is the heat transfer rate, A the surface area participating to the heat transfer (m 2 ), a the heat transfer coefficient (VWm 2 K), Tp the temperature of the black plate (K), T A the temperature of the air to be heated (K), ⁇ the thermal conductivity at the boundary layer (VWmK) and h the thickness of the boundary layer.
  • the surface area of the heat transfer is equal to the surface area of the plate, in case of an air flow parallel to one face of the hot plate. On the other hand, when the air flows by contacting both faces of the plate the heat transfer area doubles. In case of laminar flow parallel to the surface of the black plate, none of the air flow elements are perpendicular to the surface of the plate, and therefore, the air boundary layer ⁇ h ) to be overcome by convection reaches the maximum thickness and the heat transfer coefficient ⁇ a ) is less than 50 VWm 2 K.
  • textile based air heater solar collector have been schematized in the attached figures, and these figures present the following:
  • Figure 1- The front view of the textile based air heater solar collector
  • Figure 2- The side view of the textile based air heater solar collector
  • a black textile surface (fabric) (6) has been used on an active type air heater solar collector instead of black metallic, ceramic, plastic or composite plates, and passing of the air to be heated through this textile surface has been maintained.
  • the movement of the air in the collector and the transportation to the space to be heated or drying medium is provided by a fan which is connected to output or input side of the collector. It is also possible to connect 2 fans both input and output of the collector.
  • the air passes through the capillary pores between the fibers, thus the surface area participating to the heat transfer is equal to the total area of the fiber surfaces, namely, much higher compared to the plates with no air permeability.
  • the thickness of the air boundary layer (h ) on the fibers decreases to a minimum, and the heat transfer coefficient ⁇ a ) exceeds the value of 400 VWm 2 K.
  • Warm-up time of the fabrics is a good proof of the increase in the heat transfer rate due to the air flow through the fabrics.
  • the time required to heat a dry fabric up to 200 0 C by a hot air of 200 0 C is 35 s to 60 s for air flow parallel to the surface of the fabric, and 1 s to 3 s for the airflow through the fabric.
  • the heat transfer rate [Q) depends on the temperature and velocity of the air flow and the structure and the temperature of the fabric.
  • Black or dark colored woven, knitted or non-woven fabrics made by natural, regenerated or synthetic fibers and their blends can be used as textile surface.
  • the heat transfer rate is lower in loose woven and knitted fabrics, because air tends to flow through the pores between the yarns, instead of the capillary pores between the fibers within the yarns.
  • the fabrics with very tight structures require higher fan power for air flow through the textile structures. In order to extend the flow path of the air through the fabric, increasing of fabric thickness is useful. However, airflow through a tight and thick woven fabric without piles requires very high fan power. Thus, the optimum results can be provided with piled woven or knitted fabrics or not tight bulky non-woven structures.
  • the fabric is placed diagonally into the rectangular prism-shaped box (1).
  • At the entry side of the collector fabric is placed to the base (2) and is diagonally ascended through the output side, where the fabric contacts with the transparent surface (3) in order to enhance the airflow through the hot fabric (6) in the collector box.
  • the collectors are mounted on the roofs facing to the south or placed on the south-facing walls.
  • the cold air inlet (4) to the collector is above the fabric (6), and the hot air outlet (5) stays under the fabric (6).
  • the air enters at the bottom side of the collector, where the distance (volume) between the fabric (6) and the transparent surface (3) is at maximum.
  • Textile based air heater solar collectors can be used anywhere and in the same way for space heating and drying operations, in which the currently available active type solar collectors are used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

In the invented active type textile based air heater solar collector, a black textile surface (fabric) has been used instead of black metallic, ceramic, plastic or composite plates, and passing of the air to be heated through this textile surface has been succeeded. The movement of the air in the collector and the transportation to the space to be heated or drying medium is provided by a fan which is connected to output or input side of the collector. It is also possible to connect 2 fans both input and output sides of the collector. In order to enhance the airflow through the hot fabric, the fabric is placed on a fabric support (7) with a high air permeability, in the rectangular-prism shaped collector box, in which the fabric is placed to the base (2) at the inlet side (4) and is diagonally ascended to the outlet side (5), where it is in contact with the transparent surface (3) while the cold air inlet (4) is situated above the fabric and the hot air outlet (5) situated under it.

Description

TEXTILE BASED AIR HEATER SOLAR COLLECTOR
This invention relates to textile based solar collector that ensures hot air production for heating or drying operations.
Background of the invention:
Fossil-based fuels are not renewable resources and therefore they will run out after a certain period of time. On the other hand, the global warming occurring by the greenhouse effect due to carbon dioxide emissions generated by the combustion of fossil-fuels has increased the importance of the alternative energy resources.
Solar energy has the easiest and most common available use in the renewable and clean energy sources such as hydroelectric, solar, wind, geothermal, etc.
Even the solar collectors that enable water heating already have a common use, the solar air heating for space heating and drying purposes are not widespread because of the lower efficiency of these types of solar collectors.
Air heater solar energy collectors are based on a black-colored metallic, plastic, ceramic or composite plate; placed inside a box in the form of a rectangular prism made of metallic, plastic or composite material. The back and side surfaces of the rectangular box are insulated and the upper surface (sun seeing surface) is covered with a normal or special glass, polycarbonate or other transparent layer.
The black plate heated by the absorption of high-IR radiation of sun rays, heats the air to a limited extent in the box, in which a green house effect occurs. On the other hand, especially in case of moving air, this is the case in the air heater collectors; the actual heat transfer takes place by convection. In the heating through convection, the amount of heat transfer rate is proportional to the surface area of heat transfer. Thus, the majority of the development works and granted patents regarding air heater solar collectors are intended to increase the contact surface area between the air and hot black plate. The heat transfer efficiency is aimed to be increased by several constructions by providing the contact of the air with the both sides of the black plate, using finned plates of one or both sides, perforated plates or special black plates with rough surface structures, creating a meander type passing route for the air to extend the contact path with the hot plate, placing of metallic networks between the transparent layer and the black plate, etc.
The purpose of the invention: The purpose of the invention is to increase the heat transfer rate from the black absorber plate to the air to be heated. The heat transfer equation is: Q = A -a - (TP - TA) (1a)
cc = γ (1b) h where,
Q is the heat transfer rate, A the surface area participating to the heat transfer (m2), a the heat transfer coefficient (VWm2K), Tp the temperature of the black plate (K), TA the temperature of the air to be heated (K), λ the thermal conductivity at the boundary layer (VWmK) and h the thickness of the boundary layer.
The surface area of the heat transfer is equal to the surface area of the plate, in case of an air flow parallel to one face of the hot plate. On the other hand, when the air flows by contacting both faces of the plate the heat transfer area doubles. In case of laminar flow parallel to the surface of the black plate, none of the air flow elements are perpendicular to the surface of the plate, and therefore, the air boundary layer {h ) to be overcome by convection reaches the maximum thickness and the heat transfer coefficient {a ) is less than 50 VWm2K. Hence, as aforementioned in the "background of the invention" section, a number of constructions were developed and patented to increase the heat transfer surface area (A ) and to reduce the thickness of boundary layer (h ), but none of them could provide the optimum heat transfer rate.
Description of the invention:
To reach the objective of the invention, textile based air heater solar collector have been schematized in the attached figures, and these figures present the following: Figure 1-The front view of the textile based air heater solar collector Figure 2-The side view of the textile based air heater solar collector
The units in the figures have been numbered and shown below: 1) Collector outer body
2) Surface of the collector insulation
3) Transparent surface
4) Cold air inlet
5) Hot air outlet 6) Fabric 7) Fabric support
8) Collector insulation
In this invention, a black textile surface (fabric) (6) has been used on an active type air heater solar collector instead of black metallic, ceramic, plastic or composite plates, and passing of the air to be heated through this textile surface has been maintained. The movement of the air in the collector and the transportation to the space to be heated or drying medium is provided by a fan which is connected to output or input side of the collector. It is also possible to connect 2 fans both input and output of the collector. In case of passing of the air through the black textile fabric, the air passes through the capillary pores between the fibers, thus the surface area participating to the heat transfer is equal to the total area of the fiber surfaces, namely, much higher compared to the plates with no air permeability. As the air passes through the capillary pores between the fibers instead of a parallel flow to the fabric surface, the thickness of the air boundary layer (h ) on the fibers decreases to a minimum, and the heat transfer coefficient {a ) exceeds the value of 400 VWm2K.
Warm-up time of the fabrics is a good proof of the increase in the heat transfer rate due to the air flow through the fabrics. The time required to heat a dry fabric up to 200 0C by a hot air of 200 0C is 35 s to 60 s for air flow parallel to the surface of the fabric, and 1 s to 3 s for the airflow through the fabric. During the hot air flow through the fabric, the heat transfer rate [Q) depends on the temperature and velocity of the air flow and the structure and the temperature of the fabric.
Black or dark colored woven, knitted or non-woven fabrics made by natural, regenerated or synthetic fibers and their blends can be used as textile surface. The heat transfer rate is lower in loose woven and knitted fabrics, because air tends to flow through the pores between the yarns, instead of the capillary pores between the fibers within the yarns. On the other hand the fabrics with very tight structures require higher fan power for air flow through the textile structures. In order to extend the flow path of the air through the fabric, increasing of fabric thickness is useful. However, airflow through a tight and thick woven fabric without piles requires very high fan power. Thus, the optimum results can be provided with piled woven or knitted fabrics or not tight bulky non-woven structures.
The fabric is placed diagonally into the rectangular prism-shaped box (1). At the entry side of the collector fabric is placed to the base (2) and is diagonally ascended through the output side, where the fabric contacts with the transparent surface (3) in order to enhance the airflow through the hot fabric (6) in the collector box.
The collectors are mounted on the roofs facing to the south or placed on the south-facing walls. The cold air inlet (4) to the collector is above the fabric (6), and the hot air outlet (5) stays under the fabric (6). The air enters at the bottom side of the collector, where the distance (volume) between the fabric (6) and the transparent surface (3) is at maximum. By the blowing (if the fan is located to the air inlet) or suction (if the fan placed to the air outlet) effect of the fan, the air tends to flow to the exit, and due to the decrease of the distance between the fabric (6) and the transparent surface (3) during the movement of the air, the pressure and therefore the flow rate of the air through the fabric increases according to the law of Boyle-Marriott. On this account, by the diagonal placement of the fabric, the air heated by the greenhouse effect between the transparent surface (3) and fabric (6) passes through the hot fabric and enters the exit section between the base (2) and fabric (6). This permeation is higher at the upper side of the collector (close to the air outlet), where the air and the fabric have maximum temperature.
Utilization and applicability of the invention:
Textile based air heater solar collectors can be used anywhere and in the same way for space heating and drying operations, in which the currently available active type solar collectors are used.

Claims

1. A textile based air heater solar collector characterized in that the black or dark colored woven, knitted or non-woven fabrics made by natural, regenerated or synthetic fibers and their blends instead of black metallic, ceramic, plastic or composite plates is used and the air flows through this fabric (textile surface).
2. According to Claim 1. a textile based air heater solar collector characterized in that the fabric (6) on a fabric support (7) with a high air permeability is diagonally placed in the rectangular- prism shaped collector box, in which the fabric is placed to the base (2) at the inlet side (4) and is diagonally ascended to the outlet side (5), where it is in contact with the transparent surface (3) while the cold air inlet (4) is situated above the fabric and the hot air outlet (5) situated under the fabric.
EP09741482A 2009-01-12 2009-09-14 Textile based air heater solar collector Withdrawn EP2386048A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2009/00196A TR200900196A2 (en) 2009-01-12 2009-01-12 Textile based air heater solar collector.
PCT/TR2009/000115 WO2010080075A2 (en) 2009-01-12 2009-09-14 Textile based air heater solar collector

Publications (1)

Publication Number Publication Date
EP2386048A2 true EP2386048A2 (en) 2011-11-16

Family

ID=42317035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09741482A Withdrawn EP2386048A2 (en) 2009-01-12 2009-09-14 Textile based air heater solar collector

Country Status (4)

Country Link
US (1) US20110297144A1 (en)
EP (1) EP2386048A2 (en)
TR (1) TR200900196A2 (en)
WO (1) WO2010080075A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR201006980A2 (en) 2010-08-23 2011-06-21 Tarakçioğlu Işik Photovoltaic (pv) cell and textile based air heater solar collector combination (pvt).
CN104266390A (en) * 2014-09-04 2015-01-07 黄锦熙 Manufacturing method and application of full-flow-passage composite black ceramic solar heat collection panel
CN104279781A (en) * 2014-09-04 2015-01-14 黄锦熙 Manufacturing method and application of full-runner ceramic plate type solar heat collection plate
CN104266393A (en) * 2014-09-04 2015-01-07 黄锦熙 Manufacturing method and application of full-flow-passage double-faced heat collection composite black ceramic solar heat collection panel
CN104374095A (en) * 2014-09-04 2015-02-25 黄锦熙 Novel method for using composite ceramic solar panel
DE202015008919U1 (en) 2015-10-27 2016-02-22 ITP GmbH - Gesellschaft für Intelligente Produkte Cooling module for a photovoltaic unit

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875925A (en) * 1974-01-08 1975-04-08 John G Johnston Solar heater
DE7620549U1 (en) * 1976-06-29 1977-12-22 Interliz Anstalt, Vaduz SOLAR RADIATION COLLECTOR COOLED WITH A GAS MEDIUM
FR2491599B1 (en) * 1980-10-08 1986-04-04 Olivier Gilbert SOLAR COLLECTOR USING AIR AS A HEAT FLUID, AND ITS COMPONENTS
DE19505918A1 (en) * 1995-02-21 1996-08-22 Karlfried Cost Solar collector for heating air
DE19532348A1 (en) * 1995-09-01 1997-03-06 Erwin Machner Solar absorber for heating air and other gases
AT405310B (en) * 1996-07-10 1999-07-26 Voest Alpine Mach Const COMPONENT FOR THERMAL INSULATION, INSULATION AND / OR REGULATION OF BUILDING ENVELOPES
US5913993A (en) * 1997-01-10 1999-06-22 Cerex Advanced Fabrics, L.P. Nonwoven nylon and polyethylene fabric
DK200100325U3 (en) * 2001-12-01 2003-01-10
DE20312547U1 (en) * 2003-08-14 2003-11-13 Kensche, Klaus-Dieter, 45896 Gelsenkirchen Maintenance-free warm air solar collector has metallic fabric and/or perforated plates installed in it for heat transfer, and may be fitted in segments diagonally, vertically or horizontally
US20050211238A1 (en) * 2004-03-23 2005-09-29 Archibald John P Low cost transpired solar collector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010080075A2 *

Also Published As

Publication number Publication date
US20110297144A1 (en) 2011-12-08
TR200900196A2 (en) 2009-12-21
WO2010080075A2 (en) 2010-07-15
WO2010080075A3 (en) 2010-11-11

Similar Documents

Publication Publication Date Title
US9318996B2 (en) Solar energy apparatus and methods
WO2010080075A2 (en) Textile based air heater solar collector
CN101957078A (en) Flat solar hot-water and hot-air united supply device
CN202494229U (en) Flat plate collector with collecting lens array
CN102087050A (en) Solar hot-water hot-air supplying device
KR20110114403A (en) Water heater cap
JP2011033276A (en) Solar heat collecting structure
CN107917542B (en) A kind of photovoltaic and photothermal solar heat collector with porous foam metal heat exchange structure
CN101907384A (en) Solar drying device
CN105209834A (en) Tube type solar air heater
CN202149623U (en) Novel flat-plate type solar air collector
CN101846358A (en) High-efficiency low-cost solar thermal storage and heating device
CN102183096A (en) Solar pond composite drying system
KR101181242B1 (en) Solar collector
CN101373105A (en) Baffle plate type solar heat collector
CN102889693A (en) Flat-plate solar hot-water hot-air combined supply device
CN105431689A (en) Solar heat fan heater
CN111321569B (en) Combined type solar clothes drying water heater
CN103185401A (en) Flat plate heat collector with condensing lens array
KR101556234B1 (en) Solar energy system
WO2010093339A2 (en) Textile based solar collector
KR101218192B1 (en) Solar hot water Boiler
AU2017264441B2 (en) Receiver for solar power plants
KR20180077371A (en) Solar collector of direct absorption type
US20130247901A1 (en) Solar collector

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110802

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20120531

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20150401