Experimental Measurements and Numerical Simulations of Dynamic Thermal Performance of External Timber Frame Wall

2014 ◽  
Vol 899 ◽  
pp. 126-130 ◽  
Author(s):  
Iveta Skotnicova ◽  
Zdenek Galda ◽  
Petra Tymova ◽  
Lenka Lausova
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Numerical Simulations ◽  
Thermal Performance ◽  
Experimental Measurements ◽  
Simulation Methods ◽  
Light Weight ◽  
Passive House ◽  
Timber Frame ◽  
Numerical Simulation Methods

The aim of this article is to contribute to the summer thermal performance of external timber frame wall by the simultaneous use of experimental measurements and numerical simulations. The measurements were taken on an experimental timber frame passive house. The numerical modeling of the external wall using a dynamic simulation program ANSYS. The results of research are presented and discussed. It is shown that the numerical simulation methods are suitable tools for the prediction of thermal behaviour of light-weight timber-based construction.

scholarly journals Use of experimental and numerical simulation methods for rational design of the air cooling apparatus for lubrication systems of compressors

2020 ◽  
Vol 65 (2) ◽  
pp. 215-223
Author(s):  
M. V. Gureev ◽  
I. I. Khabibullin ◽  
A. N. Skrypnik ◽  
G. S. Marshalova ◽  
I. A. Popov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Heat Exchange ◽  
Thermal Performance ◽  
Rational Design ◽  
Computational Time ◽  
Computational Techniques ◽  
Air Cooling ◽  
Simulation Methods ◽  
Oil Cooler ◽  
Numerical Simulation Methods

The objective of the present work was to study heat and hydraulic parameters of an air cooling apparatus of oil (ACAO), whose geometry of its flow-through part is changed to decrease hydraulic losses in its air conduit and to increase the cooling efficiency of oil. Using numerical simulation methods of heat transfer, we have developed and tested the computational techniques applied in a wide class of heat exchange apparatuses, including those consisting of the sections of finned flat tubes manufactured by extrusion with subsequent deforming cutting. We have proposed to make a finned part of a heat-exchange surface in the form of porous inserts. This has allowed us to reduce numerical simulation equipment requirements and to decrease computational time. Predicted results well agree with experimental data; their analysis shows that the calculated value of thermal performance of the oil cooler due to the revealed construction drawbacks of the air conduit is by 19 % less than that of the designed one. Based on the results of the numerical simulation studies, a number of recommendations have been made how to improve the layout inside the air cooling apparatus for oil in order to enhance its thermal performance and aerodynamic quality. In particular, we have proposed to mount new fan blades to enhance its performance; to change the construction of the air outlet valve by taking away a baffle that partially overshadows the exit area of the bottom fan; to modify the shape of the bottom collector of the oil cooler in order to make a uniform velocity profile at the entrance of cooling sections. Connecting in series heat exchange sections may be a perspective engineering decision. The outcomes of all proposed engineering decisions can be assessed by numerical simulation methods that will allow us not to design expensive equipment.

Dynamic Simulation of the Energy Performance of the Timber-Frame Passive House

2014 ◽  
Vol 1020 ◽  
pp. 556-560 ◽  
Author(s):  
Iveta Skotnicova ◽  
Zdenek Galda ◽  
Petra Tymova ◽  
Lenka Lausova
Keyword(s):  
Numerical Simulation ◽  
Experimental Measurement ◽  
Analytical Calculation ◽  
Energy Performance ◽  
Experimental Measurements ◽  
Passive House ◽  
The Real ◽  
Timber Frame ◽  
Research And Innovation ◽  
Radiant Temperature

The aim of this article is analysis of energy performance of the timber-frame passive house. The analysis is made on the base of numerical simulation, analytical calculation and experimental measurement. Numerical simulation is solved by the Design Builder software which can determine thermal losses, thermal loads of buildings and other parameters of indoor microclimate - mean radiant temperature, operating temperature and indoor relative humidity, the Predicted Mean Vote (PMV) index, the Predicted Percentage Dissatisfied (PPD) index, concentration CO2 (carbon dioxide). Analytical calculations are solved by the software Simulace. Boundary conditions of the exterior calculation are set with using standard values and the real hour meteorological values (from database of the software Design Builder for Ostrava town and from database of the real experimental measurement values). Experimental measurements of the indoor and exterior parameters (external and indoor air temperature) are realized at the passive timber-frame house of the Research and Innovation Centre of the Moravian-Silesian Wood Cluster in the area of the Faculty of Civil Engineering, VSB – Technical University of Ostrava. Results of theoretical analysis and experimental measurements are compared and evaluated.

scholarly journals Mathematical modeling and numerical simulation of heat dissipation in led bulbs

2020 ◽  
Vol 24 (3 Part A) ◽  
pp. 1877-1884 ◽  
Author(s):  
Diego Alarcón ◽  
Eduardo. Balvís ◽  
Ricardo Bendaña ◽  
Alberto Conejero ◽  
de Fernández ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Numerical Simulation ◽  
Numerical Simulations ◽  
Heat Sink ◽  
Heat Dissipation ◽  
Thermal Contact ◽  
Heat Sinks ◽  
Experimental Measurements ◽  
Heating And Cooling ◽  
The Common

We present a detailed study of heating and cooling processes in LED luminaires with passive heat sinks. Our analysis is supported by numerical simulations as well as experimental measurements, carried on commercial systems used for outdoor lighting. We have focused our analysis on the common case of a single LED source in thermal contact with an aluminum passive heat sink, obtaining an excellent agreement with experimental measurements and the numerical simulations performed. Our results can be easily expanded, without loss of generality, to similar systems.

Achieving better cooling of turbine blades using numerical simulation methods

2013 ◽  
Vol 60 (2) ◽  
pp. 92-97
Author(s):  
A. A. Inozemtsev ◽  
A. S. Tikhonov ◽  
C. I. Sendyurev ◽  
N. Yu. Samokhvalov
Keyword(s):  
Numerical Simulation ◽  
Turbine Blades ◽  
Simulation Methods ◽  
Numerical Simulation Methods
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