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Evacuated Tube Collector

The document discusses the Evacuated-tube Collector (ETC), a solar thermal device that captures heat using a collector fluid in an evacuated glass tube, achieving high thermal efficiency. It outlines the construction components, including the evacuated tube, heat pipe, manifold, and mounting frame, as well as the working principle based on black body heat absorption. Additionally, it mentions different types of evacuated collectors, such as direct-flow and heat pipe models.

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40 views5 pages

Evacuated Tube Collector

The document discusses the Evacuated-tube Collector (ETC), a solar thermal device that captures heat using a collector fluid in an evacuated glass tube, achieving high thermal efficiency. It outlines the construction components, including the evacuated tube, heat pipe, manifold, and mounting frame, as well as the working principle based on black body heat absorption. Additionally, it mentions different types of evacuated collectors, such as direct-flow and heat pipe models.

Uploaded by

snakeps4.ps44
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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‫مادة الطاقة المتجددة‬

‫اعداد الطالب‪:‬‬
‫احمد جورج حبيب‬

‫قسم الميكانيك ‪ /‬المرحلة الرابعة‬


‫الدراسة الصباحية‬
What is the Evacuated-tube Collector ?

 The term 'Evacuated-tube collector' as it applies to the area of energy can be


defined as ' A collector in which solar thermal heat is captured by use of a
collector fluid that flows through an absorber tube contained inside an evacuated
glass tube'.

 The evacuated tube collector (ETC) consists of a number of sealed glass tubes
which have a thermally conductive copper rod or pipe inside allowing for much
high thermal efficiency and working temperature compared to the flat plate solar
collectors even during a freezing cold day.

Fig(1).shows the evacuated tube collector


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 Construction

• Evacuated Tube (ET)


Absorbs solar energy and
converts it to usable heat.
The Heat Transfer Fin helps to
transfer heat to the Heat Pipe.

• Heat Pipe (HP)


Copper vacuum pipe that
transfers the heat from within
the ET up to the manifold.

• Manifold
Insulated box containing the
copper header pipe. The header
is a pair of contoured copper
pipes with dry connect sockets
that the heat pipes plug into.

• Mounting Frame
Strong and easy to install with a
range of attachment options.
Fig(2).shows the collector construction

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The Working Principle of Evacuated-tube Collector ?

 Evacuated-tube collector works on a simple principle ‘Black body heat


absorption principle’. The principle says, ‘black colour absorbs maximum heat,
more than any other colour’.

Unlike flat panel collectors, evacuated tube collectors do not heat the water
directly within the tubes. Instead, air is removed or evacuated from the space
between the two tubes, forming a vacuum.
This vacuum acts as an insulator reducing any heat loss significantly to the
surrounding atmosphere either through convection or radiation making the
collector much more efficient than the internal insulating that flat plate
collectors have to offer.
With the assistance of this vacuum, evacuated tube collectors generally produce
higher fluid temperatures than they’re flat plate counterparts so may become
very hot in summer.

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Types of Evacuated Collectors

Direct-flow Evacuated-tube Collectors Heat Pipe Evacuated-tube Collectors Integrated Tank Solar Collectors

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