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Influence of Vacuum in Heat Losses of Parabolic Trough Solar Receivers
Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik.
2016 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
Abstract [en]

In comparison with conventional power plants and other renewable technologies,

the current cost of a Concentrating Solar Power plant is still very high. This

situation has made the industry have the necessity to research in this field to

improve efficiency and for a near future have lower cost. One of the developed field

to improve the efficiency is to decrease the heat losses in the system therefore,

having a better efficiency in the system.

In this project, in collaboration of the Solar Platform of Almeria (PSA) in Spain, the

purpose was to analyses the heat losses of a commercial parabolic trough solar

receiver at different pressures inside the receiver (at the annulus space). The

objective was finding the behavior of the heat losses as the pressure inside the

receiver is increasing allowing convection between the absorber and the glass

envelope. The PSA has developed a test bench in order to test any kind of linear

solar receptor named HEATREC. The HEATREC allows to measure the heat

losses of the receiver in a controlled environment at different temperatures. The

receiver suffered a minor modification so the pressure in the annulus space can be

control at will.

The results shown in this experiment are represented mainly in two types of

graphics. The first type shows the heat losses as a function of the temperature of

the absorber tube, this one is used as a comparison with previews research to see

if is having a correct behavior regardless the pressure in the annulus space is

being change. The second type shows the heat losses as a function of the

pressure in the annulus space inside the receiver. The experimental data show that

there is a remarkable increase in the heat losses as the pressure inside the

annulus space of the receiver increase and that it can be seen that there are two

major points in the pressure where the heat losses increase drastically (from 10# to

10$ mbar and from 10%& to 10%# mbar).

Ort, förlag, år, upplaga, sidor
2016.
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:du-23331OAI: oai:DiVA.org:du-23331DiVA, id: diva2:1044877
Tillgänglig från: 2016-11-07 Skapad: 2016-11-07

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