DESIGN�OF�UNDERFLOOR�VENTILATION�IN�HISTORIC�BUILDINGS�USING�CFD�SIMULATIONS

2012 ◽  
Author(s):  
Tomas Rencko
Keyword(s):  
Historic Buildings ◽  
Cfd Simulations

scholarly journals Smart Smoke Control as an Efficient Solution for Smoke Ventilation in Converted Cellars of Historic Buildings

2020 ◽  
Author(s):  
Wojciech Węgrzyński ◽  
Grzegorz Krajewski ◽  
Grzegorz Kimbar
Keyword(s):  
Historic Buildings ◽  
Adaptive Performance ◽  
Existing Buildings ◽  
Smoke Control ◽  
Cfd Simulations ◽  
Control Solution ◽  
Historical Building ◽  
Ansys Fluent ◽  
Traditional System ◽  
Commercial Code

Abstract The paper is focused on the topic of smoke control in a confined, underground cellar area of a historical building, that is undergoing conversion to a restaurant. Similar venues were host to some of the most devastating fires in history. We have investigated the performance of a novel solution, “smart smoke control (SSC)”, and compared its performance with “traditional” smoke venting solution. The investigation was based on CFD simulations performed in a commercial code ANSYS Fluent, modified with user-defined functions to include for the steering algorithm of the SSC. The simulation results for a traditional system were unsatisfactory, while the SSC removing substantially more smoke (approx. 50% more) has provided tenable conditions over the whole course of the analysis. The results indicate that smoke control solutions based on the adaptive performance of the smoke exhaust fan, based on the conditions within the protected premise, can be favourable for compartments with the limited size of the smoke reservoir or limited space available for ducts. These findings are also true for existing buildings, where it may be advantageous to replace the existing smoke control solution with SSC. Future investigations should include full-scale experiments, and improvements in the simple algorithms used so far.

Underfloor Air Cavity Created from Special Shaped Units and Different Intensity of Outdoor Wind Flow

2014 ◽  
Vol 1041 ◽  
pp. 200-205
Author(s):  
Tomáš Renčko ◽  
Anna Sedláková
Keyword(s):  
Boundary Conditions ◽  
Geometric Model ◽  
Wind Flow ◽  
Historic Buildings ◽  
Cfd Simulations ◽  
Air Cavity ◽  
Geometric Models ◽  
Materials Used ◽  
Air Cavities ◽  
New Buildings

Underfloor air cavities are commonly used in connection with remedial treatments of damp masonry, especially in historic buildings, but in new buildings respectively, and further also by the realization of foundation boards, and as a protection against radon. The materials used can be original, but it is also possible to use modern special shaped units. To assessment the airflow in the air cavity the recently often used CFD simulations can be employed. The application of simple geometric models can accurately confirm or refute the appropriateness of a proposed solution. Of the two completed simulations, the first overall geometry of a modeled house, ascertains the actual pressure on the walls due to wind effects. Results from the first simulation are applied as boundary conditions, where the geometric model represents the underfloor air cavity created from special shaped units. The overall geometric models are simulated by a different intensity of outdoor wind flow.

scholarly journals CFD Proposals for the Layout of Air Vents for Realization of Underfloor Air Cavity Created from Special Fittings

2013 ◽  
Vol 8 (2) ◽  
pp. 51-60
Author(s):  
Tomáš Renčko ◽  
Anna Sedláková
Keyword(s):  
Air Flow ◽  
Historic Buildings ◽  
Computational Simulations ◽  
Cfd Simulations ◽  
Air Cavity ◽  
Air Cavities

Abstract In basement acting humidity can be removed using ventilated flooring created from special fittings. Particular attention should be paid to the design layout of inlet and outlet of openings. The aim of the correct proposal is the even distribution of air flow over the whole surface of the cavity. To achieve this state and to objective evaluate the air flow in the gaps, which are made up of shaped objects, the work uses CFD simulations. Based on computational simulations, structural designs of underfloor air cavities created using special fittings are designed. As results are the proposals for the layout of air vents for historic buildings for realization in Kosice.

CFD SIMULATIONS OF POOL BOILING WITH VARIOUS HEATER WALL CONDITIONS

2018 ◽  
Author(s):  
Yeong Shin Jeong ◽  
In Cheol Bang
Keyword(s):  
Pool Boiling ◽  
Cfd Simulations ◽  
Heater Wall

Layaway Procedures for U.S. Army Facilities: Inspection, Maintenance, and Repair of Historic Buildings.

1999 ◽  
Author(s):  
S. L. Hunter ◽  
D. R. Uzarski ◽  
V. E. Jenkins ◽  
D. M. Bailey ◽  
M. J. Binder
Keyword(s):  
Historic Buildings ◽  
Maintenance And Repair

Comparison of DSMC and CFD Models of Heat Transfer in a Rarefied Two-Dimensional Geometry

2018 ◽  
Author(s):  
Dilesh Maharjan ◽  
Mustafa Hadj-Nacer ◽  
Miles Greiner ◽  
Stefan K. Stefanov
Keyword(s):  
Heat Transfer ◽  
Rarefied Gas ◽  
Complex Geometry ◽  
Direct Simulation Monte Carlo ◽  
Accurate Method ◽  
Vacuum Drying ◽  
Helium Pressure ◽  
Two Dimensional ◽  
Dsmc Method ◽  
Cfd Simulations

During vacuum drying of used nuclear fuel (UNF) canisters, helium pressure is reduced to as low as 67 Pa to promote evaporation and removal of remaining water after draining process. At such low pressure, and considering the dimensions of the system, helium is mildly rarefied, which induces a thermal-resistance temperature-jump at gas–solid interfaces that contributes to the increase of cladding temperature. It is important to maintain the temperature of the cladding below roughly 400 °C to avoid radial hydride formation, which may cause cladding embrittlement during transportation and long-term storage. Direct Simulation Monte Carlo (DSMC) method is an accurate method to predict heat transfer and temperature under rarefied condition. However, it is not convenient for complex geometry like a UNF canister. Computational Fluid Dynamics (CFD) simulations are more convenient to apply but their accuracy for rarefied condition are not well established. This work seeks to validate the use of CFD simulations to model heat transfer through rarefied gas in simple two-dimensional geometry by comparing the results to the more accurate DSMC method. The geometry consists of a circular fuel rod centered inside a square cross-section enclosure filled with rarefied helium. The validated CFD model will be used later to accurately estimate the temperature of an UNF canister subjected to vacuum drying condition.

Effect of ring baffle configuration in a self-priming venturi scrubber using CFD simulations

Particuology ◽  
2019 ◽  
Vol 47 ◽  
pp. 63-69
Author(s):  
Shuai Yang ◽  
Xiangdi Zhao ◽  
Wanfu Sun ◽  
Jiwu Yuan ◽  
Zheng Wang
Keyword(s):  
Cfd Simulations ◽  
Venturi Scrubber
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