WO2016055077A1

WO2016055077A1 - Parabolic collector solar radiation absorber tube (receiver element)

Info

Publication number: WO2016055077A1
Application number: PCT/EG2014/000029
Authority: WO
Inventors: Taher Mohamed Fathy ABDO
Original assignee: Abdo Taher Mohamed Fathy
Priority date: 2014-10-09
Filing date: 2014-10-09
Publication date: 2016-04-14

Abstract

A parabolic collector solar radiation absorber tube (receiver element) designed with this applied shape for enhancing reducing the thermal losses emissivity and the rays reflectivity specifications. The HTF (heat transfer fluid) going through an heat receiver consists of steel tube (2) inserted in aluminum heat sink tube (3) have diameter bigger. The tube surface, surrounded by an air evacuated glass tube (6). The HCE incorporates glass-to-metal seals and metal bellows to achieve the vacuum-tight enclosure. The vacuum enclosure serves primarily to protect the aluminum heat sink surface and to reduce heat losses at the high operating temperatures when contact with the outer air.

Description

Parabolic collector solar radiation absorber tube (receiver element)

Technical eidt

Concentrated Solar Power CSP parabolic trough - thermal radiation receiver.

Background Art: -

Parabolic trough technology is currently the most proven solar thermal electric technology, The heat receiver is important part that effect positively or negatively for ail the CSP parabolic trough system efficiency.

All prior arts receiver technology built in circular shape tube receiver, that mean small absorption area, that causing over 20% emissivity, mean 20% losses from emissivity mean plant power fosses 20% mean 20% efficiency reducing and this will be less than 2% in this applicant invention.

Citing Patent Applicant Publication

date

D1 US2014283817 (A1> SIEMENS CONCENTRATED 2014-09-25

SOLAR POWER LTD {!L]

D2 US2014130790 (A1) SIEMENS CONCENTRATED 2014-05-15

SOLAR POWER LTD [!L]

D3 US2013186389 (A1) BAR Ai MENASHE PL] 2013- 07-25

EZE RAMt PL]

D4 WO2O14053249 (A1) SIEMENS AG [DEI 2014- 04-10

SIEMENS CONCENTRATED SOLAR POWER LTD [IL]

ft is an objects of the present invention to provide a good method not available in the prior arts, to improve the characteristics (improving the thermal absorption and thermal conductivity, reducing the heat emissivity losses and reflectivity) of concentrated solar receiver

Disclosure of invention:'

The linear receiver, referred to heat collection element (HCE), that designed to improve and to provide height efficiency collector absorption. The HCE consists of steel tube covered with bigger diameter aluminum heat sink tube, ail tubes surface, surrounded by an air evacuated glass tube. The HCE incorporates glass-to- metal seals and metal bellows to achieve the vacuum-tight enclosure. The vacuum enclosure serves primarily to protect the aluminum heat sink surface and to Reduce heat losses at the high operating temperatures when contact with the outer air. The vacuum in the HCE is maintained at about 0.0001 mm Hg (Pa 0.013) .

The aluminum heat sink give excellent selective thermal conductivity and good concentrated light absorptivity that mean very low reflectivity. Absorptivity about 0.98 for both direct and tilt beams solar radiation, and a design emissivity of 0.04 at 350°C (662°F). The outer glass cylinder has anti-reflective coating on both surfaces to reduce reflective losses off the glass tube .Getters, metallic substances that are designed to absorb gas molecules, are installed in the vacuum space to absorb hydrogen and other gases that permeate into the vacuum annul use over time ief description of the drawing:-

Fig. 1 shows cross-section of the invented tube

Item Description

no.

1 Fins.

2 Inner steel tube.

3 Aluminum heat sink tube.

4 HTF passage

5 air Vacuumed space

6 Outer glass vacuumed tube.

Fig. 2 shows a representation of the linear invented tube.

Claims

C!aim:-

1. A Parabolic collector solar radiation absorber tube (receiver element) means of many parts said fins said inner steel tube said, aluminum heat sink jacket, said air vacuumed space and said outer glass vacuumed tube .

2. The combination of claim 1 wherein said fins that designed to enlarge the incident absorption aria for (about ten times circular shape section) to enhancing absorptivity, it designed as a deep longitudinal black painted color caves that trap the concentrated solar rays.

3. The combination of claim 1 and 2 wherein said fins that designed from aluminum alloy to improve the thermal conductivity. Wherein said fins designed have thin edge and thin thickness and the distance between fins become narrow this guaranty improving the receiver absorption characteristics.

4. The combination of claim 1 ,2 and 3 wherein said fins that designed from an aluminum alloy that curved to not allow to any rays to reflect out wherever the rays incident from any different angels.

5. The combination of claim 1,2,3 and 4 wherein said Aluminum heat sink tube that means fins in one body with this tube.

6. The combination of claim 1 wherein said Inner steel tube that considered fixation option, only if the HTF will do chemical reaction with the aluminum alloy such as salty HTF or other.

7. The combination of claim 1 wherein said HTF passage that inner hollow tube either steel or aluminum. The HTF flow to drawing-out the heat.

8. The combination of daim 1 wherein said Outer glass vacuumed tube to insulate and protect the aluminum fins from direct contact with outer air that causing negative effect tosses of heat.