CFD SIMULACE SOLÁRNÍHO KOMÍNU

CFD SIMULATION OF A SOLAR CHIMNEY

conference paper

en

The paper presents research of CFD simulation and comparison with real solar chimney characteristics. Two types of solar chimney have been built at Department of Thermodynamics and Environmental Engineering of the Brno University of Technology. The main goal of the experiments and simulations is to investigate the performance of the solar chimney under the climatic conditions of the Czech Republic, and to explore the potential of solar chimneys for ventilation of residential buildings. Both solar chimneys have been tested. Solar chimneys are connected in parallel each to other and placed in one casing. Dimensions of each are: width 750 mm, height 1500 mm and gap 200 mm. One of the chimneys contains a heat storage layer made of concrete to make the air flow rate through the chimney more uniform in time. This should also allow the utilization of the solar chimney for night cooling. The other chimney is equipped with metal plate absorption layer to achieve higher wall temperature. The solar chimney is oriented to the south and it is inclined 30 degrees from the vertical. The following parameters are monitored: flow rate induced by buoyancy, surface temperatures as well as air temperatures in the chimneys and meteorological conditions.

Clanek se zabyva podrobnym rozborem CFD simulaci a porovnani jejich vysledku s merenimi skutecneho solarniho kominu. Solarni komin ve dvou variantach byl zkonstruovan na odboru Termomechaniky Vysokeho uceni technickeho v Brne. Hlavni ucel experimentu je vyzkum vyuziti solarniho kominu pro vetrani v klimatickych podminkach ceske republiky. Nyni jsou v provozu dve konstrukce soplarniho kominu lisici se provedenim akumulacni vrstvy, kominy jsou umisteny vedle sebe a spojeny jednim ramem. Rozmery akumulacni vrstvy kominu jsou: sirka 750mm, vyska 1500 mm a hloubka 200 mm. Prvni komin ma akumulacni vrstvy vyrobenou z betonu, to proto abychom dosahli vice rovnomerne proudeni vzduchu kominem v prubehu dne. Tato uprava rovnez umoznuje vyuziti solarniho kominu pro nocni chlazeni. Druhy komin ma akumulacni vrstvu tvorenou pouze tenkym ocelovym plechem. V tomto pripade naopak muzeme dosahnout maximalniho prutoku kominem diky vysoke povrchove teplote absorpcni vrstvy. Solarni kominy jsou orientovany na jih a jsou skloneny 30˚ od vertikaly. Byly porovnavany nasledujici parametry: prutok kominem iniciovany vztlakovou silou, teploty povrchu, stejne jako teploty vzduchu proudiciho ruznymi castmi kominu a celkove meteorologicke podminky.

The paper presents research of CFD simulation and comparison with real solar chimney characteristics. Two types of solar chimney have been built at Department of Thermodynamics and Environmental Engineering of the Brno University of Technology. The main goal of the experiments and simulations is to investigate the performance of the solar chimney under the climatic conditions of the Czech Republic, and to explore the potential of solar chimneys for ventilation of residential buildings. Both solar chimneys have been tested. Solar chimneys are connected in parallel each to other and placed in one casing. Dimensions of each are: width 750 mm, height 1500 mm and gap 200 mm. One of the chimneys contains a heat storage layer made of concrete to make the air flow rate through the chimney more uniform in time. This should also allow the utilization of the solar chimney for night cooling. The other chimney is equipped with metal plate absorption layer to achieve higher wall temperature. The solar chimney is oriented to the south and it is inclined 30 degrees from the vertical. The following parameters are monitored: flow rate induced by buoyancy, surface temperatures as well as air temperatures in the chimneys and meteorological conditions.

větrání, solární energie, CFD

ventialtion, solar energy, CFD

2005

30.03.2005

ELSEVIER

Aberdeen

978-0-08-044718-6

Proceedings of World Renewable Energy Congress (WREC2005)

1–1

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