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.

Gerotor Fuel Pump Performance and Leakage Study

2011 ◽  
Author(s):  
Mario Alberto Ruvalcaba ◽  
Xiao Hu
Keyword(s):  
Three Dimensional ◽  
Tip Clearance ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Pump Performance ◽  
Pump Flow ◽  
Automotive Fuel ◽  
Commercial Code ◽  
Gerotor Pumps ◽  
Good Agreement

Gerotor pumps are utilized in a number of automotive applications such as fuel lift. Volumetric efficiency and leakage are causes of concern in gerotor pumps. To optimize pump performance and reduce leakage, it is fundamental to comprehend the fluid dynamics inside the pump passageways. In this paper, a three-dimensional CFD methodology has been developed and applied to predict the pump performance, to understand pump flow dynamics and to investigate pump leakage for gerotor pumps equipped in automotive fuel systems. The methodology is based in the commercial code ANSYS FLUENT and the analytical focal points are the pump performance and leakage over a range of motor speeds and output pressures, 4000 RPM and 5400 RPM, also 450 kPa and 600 kPa. The CFD results are first contrasted with the experimental data and a very good agreement has been achieved. Extensive CFD simulations are then conducted to study the effect of the tip clearance on pump flow performance and leakage.

scholarly journals Drag reduction in a class 8 truck - scaled down model

2018 ◽  
Vol 172 ◽  
pp. 01003
Author(s):  
R Vishwa Krishna. ◽  
R Suwathy. ◽  
M Pragadeesh. ◽  
M Venkatesan.
Keyword(s):  
Numerical Model ◽  
Drag Coefficient ◽  
Heavy Duty ◽  
Commercial Vehicles ◽  
Heavy Load ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Class 8 Truck ◽  
Gap Width ◽  
Front Radius

Trucks are heavy load vehicles used mainly for commercial transport operations. There are several classes of heavy duty commercial vehicles classified based on the weight loaded. More than 50% of the engine output power in such trucks is utilized to overcome the drag. Drag force in automobiles is the resistance offered by air on vehicles at higher speeds. Class 8 trucks suffer higher drag when compared to other classes. In the present work, a numerical model is developed using a commercial code ANSYS FLUENT to predict the drag coefficient value. The effects of gap width and cab front radius with a constant fairing is analysed using the numerical model developed. A Class 8 model truck with minimal drag coefficient having constant fairing and optimized gap width between the trailer and cab is proposed.

scholarly journals Tenement House “Under The Golden Crown” In Wrocław - Renovation Of The Peculiar Monument

2015 ◽  
Vol 19 (4) ◽  
pp. 51-60 ◽  
Author(s):  
Krystyna Kirschke
Keyword(s):  
20Th Century ◽  
Department Store ◽  
Commercial Buildings ◽  
Early 20Th Century ◽  
Historic Buildings ◽  
Historical Building ◽  
Tenement House ◽  
Post War ◽  
The Many ◽  
Skeleton Structure

Abstract Among the many historic buildings in Wroclaw, there is a property address Rynek 29 - Oławska 2, that in 1970 entered in the register of monuments as “a department store, earlier tenement house called “Under the Golden Crown”. In the fact it was built in 1961 and it is neither a historical building nor department store. It is, spectacular example of creative retrospective, in the post-war reconstruction of Wroclaw. It has relict of medieval and Renaissance architecture, but the aboveground parts have a skeleton structure of commercial buildings from the early 20th century. In recent years, there is a problem with renovating such buildings. Recognition of these monuments has become a requirement now. Because only in this way in the future, in the course of modernization works, you will be able to avoid bad decisions and unforeseen situations.

scholarly journals Preservation of Art Style in Interior and Architecture Cultural Heritage Buildings: A Case Study in Hotel Kartika Wijaya & Hotel Niagara Malang

Humaniora ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 87
Author(s):  
Sri Rachmayanti ◽  
Christianto R. ◽  
Anak Agung Ayu Wulandari
Keyword(s):  
Cultural Heritage ◽  
Interior Design ◽  
Historic Buildings ◽  
Historical Building ◽  
Art Deco ◽  
Heritage Buildings ◽  
Heritage Building ◽  
Art Style

Kartika Wijaya Hotel and Niagara Hotel-Malang are two heritage buildings, which are well managed to preserve their historical building that, has been established since 1891. We can find good harmony and variety in interior elements and design styles, such as Colonial style, Art Noveau and Art Deco style. The purpose of documentating this heritage building that has different design styles is for those who needed. The data will be classified according to the period of the development of the buildings and characteristics of existing styles. The research objective on Kartika Wijaya hotel building and art styles is to preserve historic buildings in Indonesia, through documentation of interior elements and architectures, and to conducted a study of the interior and architectures elements, interior design ornaments, that founded in historical Kartika Wijaya Hotel and Niagara Hotel in Malang, whose the existence needs to be preserved. 

Predictive Performance of Hygro-Thermal Simulation Models: A Case Study

2019 ◽  
Vol 887 ◽  
pp. 401-407
Author(s):  
Samira Aien ◽  
Mahnameh Taheri ◽  
Sarin Pinich ◽  
Matthias Schuss ◽  
Ardeshir Mahdavi
Keyword(s):  
Simulation Models ◽  
Predictive Performance ◽  
Moisture Damage ◽  
Silica Aerogels ◽  
Existing Buildings ◽  
Historical Building ◽  
Hygrothermal Performance ◽  
And Performance ◽  
User Friendly

In recent years, many researchers have focused on the energy efficiency and performance of existing buildings. In order to predict the hygrothermal performance and minimize the risk of moisture damage in retrofit cases, user-friendly moisture calculation tools have been developed. However, concerns have been raised as to how to increase the reliability of such tools. In this context, the present study uses simulation to investigate the retrofit potential of the historical building façades via application of silica aerogels on the external walls. Monitored data provided the basis for generation of a more accurate initial simulation model, as well as the evaluation of the predictive performance of the model.

Computational Study of the Downpull Force on High-Head Slide Gates

2019 ◽  
Author(s):  
Juan C. Arango Escobar ◽  
David Calderon Villegas ◽  
Aldo Benavides Moran ◽  
Alejandro Molina Ochoa
Keyword(s):  
Computational Study ◽  
Maximum Flow ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Flow Through ◽  
High Head ◽  
The One ◽  
Bottom Outlet

Abstract This paper presents CFD simulations of the flow through a real bottom outlet equipped with high-head slide gates. The operating head of the gates and the maximum flow rate are 70 m and 650 m3/s, respectively. The numerical simulations were performed in ANSYS-FLUENT version 19.2. VOF method was used to model the free surface flow downstream the slide gates. Hydrodynamic forces were calculated at nine gate openings for a standard 45° lip gate; the downpull coefficients obtained from the simulations were compared with estimates from Naudascher’s analytical method. According to the CFD results, the downpull force acting on the 45° lip gate is 5%–10% lower than the one estimated analytically for the analyzed gate positions. Additionally, the flow through an inverted 30° lip gate was simulated to estimate the downpull coefficient at various gate openings. These coefficients cannot be determined analytically. The methodology here described can easily be applied to different gate geometries for which design coefficients are not available.

Central Ventilation System with Heat Recovery as One of the Measures to Upgrade Energy Efficiency of Historic Buildings

2014 ◽  
Vol 633-634 ◽  
pp. 1077-1081 ◽  
Author(s):  
Viktor Pukhkal ◽  
Nikolay Vatin ◽  
Vera Murgul
Keyword(s):  
Heat Recovery ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Heat Losses ◽  
Historic Buildings ◽  
Existing Buildings ◽  
Apartment Building ◽  
Thermal Shield ◽  
Saint Petersburg ◽  
Reducing Energy

Improving thermal shield in buildings and reducing energy consumption have become major problems to be solved for the recent decades. Natural ventilation accounts for nearly half of heat losses in existing buildings. A controlled heat recovery ventilation system makes it possible to reduce irrational heat losses and improve microclimatic comfort. A typical historic residential apartment building constructed before industrial times in Saint-Petersburg is subject of this article. Options of centralized controlled heat recovery ventilation systems for old historic apartment buildings in Saint-Petersburg are suggested in this article.

Analysis of Flow Mal-Distribution in a Cross-Flow Heat Exchanger

2014 ◽  
Vol 592-594 ◽  
pp. 1428-1432 ◽  
Author(s):  
Krishna P. Mohan ◽  
Shekar M. Santosh ◽  
M. Ramakanth ◽  
M.R. Thansekhar ◽  
M. Venkatesan
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Cross Flow ◽  
Flow Distribution ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Uniform Flow Distribution ◽  
Flow Heat ◽  
Channel Assembly ◽  
Uniform Fluid

Flow mal-distribution is defined as the non-uniform fluid flow distribution among the parallel channels having a common header. Flow mal-distribution is present in every header channel assembly. This mal-distribution has a significant effect on the performance of the heat exchanger by increasing the pressure drop and affecting the heat transfer characteristics. However, in designing a heat exchanger, a uniform flow distribution in each channel is assumed. The present work attempts to reduce the flow mal-distribution in a cross flow heat exchanger. A numerical analysis is done using a commercial code ANSYS FLUENT 3D and the results are validated experimentally. A parametric study is done by changing the size of the channels within the heat exchanger so as to reduce the flow mal-distribution. The effect of varying channel size on flow mal-distribution and pressure drop across the heat exchanger is studied and a geometry with reduced flow mal-distribution is found.

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