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Experimental and theoretical investigation of an evacuated tube solar water heater incorporating wickless heat pipes

Al-Joboory Hassan Naji Salman

Archives of Thermodynamics

2020

Vol. 41, no 3

3--31

The present work involved an extensive outdoor performance testing program of a solar water heating system that consists of four evacuated tube solar collectors incorporating four wickless heat pipes integrated to a storage tank. Tests were conducted under the weather conditions of Baghdad, Iraq. The heat pipes were of 22 mm diameter, 1800 mm evaporator length and 200 mm condenser length. Three heat pipe working fluids were employed, ethanol, methanol, and acetone at an inventory of 50% by volume of the heat pipe evaporator sections. The system was tested outdoors with various load conditions. Results showed that the system performance was not sensitive to the type of heat pipe working fluid employed here. Improved overall efficiency of the solar system was obtained with hot water withdrawal (load conditions) by 14%. A theoretical analysis was formulated for the solar system performance using an energy balance based iterative electrical analogy formulation to compare the experimental temperature behavior and energy output with theoretical predictions. Good agreement of 8% was obtained between theoretical and experimental values.

CFD analysis of blood flow within aorta of patient with coarctation of aorta

Rojczyk M., Ostrowski Z., Adamczyk W., Melka B., Bandoła D., Gracka M., Knopek A., Golda A., Nowak A. J.

Studia Informatica

2016

Vol. 37, nr 3A

43--55

Blood flow in a real geometry of aorta was analysed. The CFD analysis was performed using commercial ANSYS/Fluent code. Velocity profile was used to mimic inlet flow conditions during human cardiac cycle. Outlet pressure boundary condition was coupled with lumped parameter model (electrical analogy) of circulatory system.

Przeanalizowano jednofazowy przepływ krwi dla modelu aorty odwzorowującego rzeczywistą geometrię. Symulacja CFD przeprowadzona była za pomocą komercyjnego oprogramowania ANSYS/Fluent. Na wlocie do geometrii zadano profil prędkości, odpowiadający cyklowi pracy serca. Ciśnienie krwi na wylotach określono przez sprzężenie z parametrycznym modelem skupionym (zbudowanym w analogii elektrycznej).