Modeling of conduction/convection heat loss from a trough CSP absorber tube
Başlık çevirisi mevcut değil.
- Tez No: 401873
- Danışmanlar: DR. MATT ROESLE
- Tez Türü: Yüksek Lisans
- Konular: Enerji, Makine Mühendisliği, Energy, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2011
- Dil: İngilizce
- Üniversite: Eidgenössische Technische Hochschule Zürich (ETH)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 114
Özet
Özet yok.
Özet (Çeviri)
In the course of this project a thermal model of a parabolic trough solar receiver is developed and implemented in commercial CFD software coupled to a Monte Carlo ray-tracing code. The model is then used to determine heat loss from a solar receiver, the effect of various gas compositions in the vacuum chamber, the necessary vacuum pump performance, and the pressure distribution along a solar receiver assembly. The model includes all heat transfer modes in detail: convection, conduction, and radiation heat transfer. The effects of non-uniform incident solar radiation on the absorber tube and the vacuum jacket as well as conduction through the rarefied gas in the annulus are analyzed in detail. Two and three dimensional models are examined in various conditions and compared in regard to heat loss. Simulation results show that the state-of-the-art solar receivers will suffer from excessive heat loss at higher operating temperatures above 400 oC mainly due to thermal radiation. Filling the vacuum chamber with heavy inert gases, i.e. Xe and Kr, instead of air, will reduce the conduction heat loss through the vacuum chamber dramatically. However, their effect on the total heat loss is relatively small because the conduction heat loss constitutes ≤10% of the total heat loss. The required vacuum pump speed depends on substantially the leakage rate, pressure inside the vacuum chamber and the pump down time. During evacuation process a pressure gradient will be formed along the solar receiver assembly due to the low conductance of the vacuum chamber. Model verification and validation are presented to demonstrate the credibility of the model. The model parameters are chosen to match the current state-of-the-art solar receivers and simulation results are in a good agreement with experiments. Model limitations resulting from the simplifications and assumptions are discussed at the end of the report
Benzer Tezler
- Deniz tabanı topoğrafyasının hidrotermal dolaşıma etkileri: Lucky strike hidrotermal alanında çalışma
Effects of sea bottom topography on hydrothermal circulation: Study on LLucky strike hydrothermal
ENGİN ERÇETİN
Yüksek Lisans
Türkçe
2017
Jeofizik Mühendisliğiİstanbul Teknik ÜniversitesiJeofizik Mühendisliği Ana Bilim Dalı
DOÇ. DR. DOĞA DOĞAN
- Yalıtım uygulamaları için toz esaslı malzemelerin geliştirilmesi ve karakterizasyonu
Development and characterization of powder based materials for insulation applications
OZAN KOVANCI
Yüksek Lisans
Türkçe
2013
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
PROF. DR. ŞAFAK YILMAZ
- MTR tipi yakıt elemanı kullanılan araştırma reaktörlerinde soğutucu kanalı tıkanması kazası analizi
Channel blockage accident analysis for research reractor with MTR type fuel elements
AYHAN YILMAZER
Yüksek Lisans
Türkçe
1997
Nükleer Mühendislikİstanbul Teknik ÜniversitesiNükleer Enerji Mühendisliği Ana Bilim Dalı
PROF. DR. HASBİ YAVUZ
- Yüksek viskoziteli bir akışkanın dikdörtgen kesitli kanal akışında hidrodinamik ve ısıl alanların bilgisayar destekli modellenmesi
Computational modelling of flow and heat transfer of a highly viscous fluid in three-dimensional rectangular channels
ORHAN GÖKÇÖL
Doktora
Türkçe
1998
Uçak Mühendisliğiİstanbul Teknik ÜniversitesiUçak Mühendisliği Ana Bilim Dalı
PROF. DR. C. RUHİ KAYKAYOĞLU
- Güneş enerjili kendinden pompalı sıcak su sisteminin analiz ve simülasyonu
Analysis and simulation of a two phase self pumping solar water heater
TUNCAY GÜVEN