Thermal Comfort Estimation on Indoor Space Using Computational Fluid Dynamics - A Case Study of Small Office Room

2013 ◽  
Vol 353-356 ◽  
pp. 3015-3019 ◽  
Author(s):  
Yu Tuan Chou ◽  
Shao Yi Hsia
Keyword(s):  
Wind Speed ◽  
Thermal Comfort ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Living Environment ◽  
Design Stage ◽  
Indoor Space ◽  
Environment Model ◽  
Preliminary Design Stage ◽  
Indoor Spaces

There is highly relevant between thermal comfort and air quality in indoor spaces. Temperature, wind speed, and other related conditions are crucial to workplace and living environment. The commercial software of Solidworks Flow Simulation is applied to conduct a three-dimensional office environment model in this paper. The numerical simulation according to flow field characteristic analyzes different air controlling in varied closed partition. Through the two convergence conditions, MRT and OT, get the air characteristics of the grid and to calculate the PMV and to predict the PPD using the software. Therefore, designers can acquire more adequate information of thermal comfort, wind speed and temperature in preliminary design stage via the efficient simulation process.

scholarly journals Automatic Reconstruction of Multi-Level Indoor Spaces from Point Cloud and Trajectory

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3493
Author(s):  
Gahyeon Lim ◽  
Nakju Doh
Keyword(s):  
Point Cloud ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Reconstruction Method ◽  
Complex Environments ◽  
Indoor Space ◽  
Multi Level ◽  
Level Building ◽  
Indoor Spaces ◽  
Data Term

Remarkable progress in the development of modeling methods for indoor spaces has been made in recent years with a focus on the reconstruction of complex environments, such as multi-room and multi-level buildings. Existing methods represent indoor structure models as a combination of several sub-spaces, which are constructed by room segmentation or horizontal slicing approach that divide the multi-room or multi-level building environments into several segments. In this study, we propose an automatic reconstruction method of multi-level indoor spaces with unique models, including inter-room and inter-floor connections from point cloud and trajectory. We construct structural points from registered point cloud and extract piece-wise planar segments from the structural points. Then, a three-dimensional space decomposition is conducted and water-tight meshes are generated with energy minimization using graph cut algorithm. The data term of the energy function is expressed as a difference in visibility between each decomposed space and trajectory. The proposed method allows modeling of indoor spaces in complex environments, such as multi-room, room-less, and multi-level buildings. The performance of the proposed approach is evaluated for seven indoor space datasets.

scholarly journals Efficiency Enhancement on Thermal Comfort Assessment of Indoor Space with Air-Conditioner Using Computational Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Yu-Tuan Chou ◽  
Shao-Yi Hsia ◽  
Bi-Wen Lee
Keyword(s):  
Taguchi Method ◽  
Thermal Comfort ◽  
Flow Simulation ◽  
Successful Implementation ◽  
Outlet Temperature ◽  
Air Conditioner ◽  
Indoor Space ◽  
Factorial Method ◽  
Operation Conditions ◽  
Full Factorial

Thermal comfort providing is one of the biggest uses of energy in building. For giving better human comfort, the suitable operation conditions of air-conditioner are the most important. The quick and right approach is necessary. In this paper, a small office is studied to improve office staff staying for a long period of time and achieve the thermal comfort environment for reducing energy consumption. Commercial software, Solidworks, is utilized for modeling the facilities and the Flow Simulation module for analyzing the air properties of the indoor space. Four types of air-conditioner operation are applied to set the simulated conditions, including exterior temperature, outlet temperature and wind speed of air-conditioner, and location of air-conditioner. Predicted mean vote (PMV) and predicted percent dissatisfied (PPD) at specific office areas are further acquired through dynamic anthropometry. For seeking the optimal control factors, both of the full factorial method and Taguchi method are utilized to obtain the PMV of specified location. The analyzed result shows the evaluation speed of indoor thermal comfort by Taguchi method is faster than the full-factorial method. It is concluded that software simulation with Taguchi method shows the successful implementation and higher efficiency for thermal comfort assessment.

Concurrent Engineering Design of Sheet Stamping by Using an Inverse FE Approach

1997 ◽  
Author(s):  
Shiyong Yang ◽  
Kikuo Nezu
Keyword(s):  
Finite Element ◽  
Concurrent Engineering ◽  
Process Simulation ◽  
Three Dimensional ◽  
Sheet Forming ◽  
Design Stage ◽  
Forming Process ◽  
Element Analysis ◽  
Preliminary Design Stage ◽  
Product And Process

Abstract An inverse finite element (FE) algorithm is proposed for sheet forming process simulation. With the inverse finite element analysis (FEA) program developed, a new method for concurrent engineering (CE) design for sheet metal forming product and process is proposed. After the product geometry is defined by using parametric patches, the input models for process simulation can be created without the necessity to define the initial blank and the geometry of tools, thus simplifying the design process and facilitating the designer to look into the formability and quality of the product being designed at preliminary design stage. With resort to a commercially available software, P3/PATRAN, arbitrarily three-dimensional product can be designed for manufacturability for sheet forming process by following the procedures given.

scholarly journals Application of thermal comfort assessment models to indoor areas near glazed walls – experimental evaluation

2021 ◽  
Vol 20 (1) ◽  
pp. 106-127
Author(s):  
António Manuel Figueiredo Freitas Oliveira ◽  
◽  
Helena Corvacho ◽  
Keyword(s):  
Solar Radiation ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
National Laboratory ◽  
Environmental Parameters ◽  
Outdoor Environment ◽  
Assessment Model ◽  
Indoor Space ◽  
The Impact ◽  
Indoor Spaces

In this paper, some of the results of an experimental study are presented. Its purpose was to better understand the impact of glazing on thermal comfort of users of indoor spaces (living and working), especially in the areas near glazed walls. Glazed elements, such as windows and glazed doors, allow visual access to the outdoor environment and the entrance of natural light and solar heat gains but they are often the cause of unwanted heat losses and gains and are disturbing elements in obtaining thermal comfort, both in global terms and in what concerns local discomfort due to radiant asymmetries and/or air draughts. Furthermore, solar radiation directly affecting users in the vicinity of glazing can also cause discomfort. These disturbances are recognized by users, both on cold winter days and on hot summer days. To assess thermal comfort or thermal neutrality of a person in a particular indoor space, it is important to know their location within that space. Thus, in order to adequately assess thermal comfort in the areas near the glazing, the indoor thermal environment must be characterized for this specific location. In this study, two indoor spaces (a classroom and an office-room) of a school building were monitored at different periods of the year. The measurements of the environmental parameters were performed both in the center of the rooms and in the areas near the glazing. Five models of thermal comfort assessment were then applied to the results, in order to compare the comfort conditions between the two studied locations and to evaluate the applicability of these models to the areas close to glazed walls. It was observed there was clearly a greater variability of comfort conditions in the vicinity of the glazed walls when compared to the center of the rooms. The application of thermal comfort assessment models to the two studied rooms was able to reveal the differences between the two compared locations within each space. It was also possible to show the effect of incoming solar radiation and the influence of the geometry of the spaces and of the ratio between glazed area and floor area by comparing the results for both spaces. The assessment model proposed by LNEC (Portuguese National Laboratory of Civil Engineering) proved to be the most adapted to Portuguese users’ habits.

Assessment of Corner Failure Depths in the Deep Drawing of 3D Panels Using Simplified 2D Numerical and Analytical Models

2000 ◽  
Vol 123 (2) ◽  
pp. 248-257 ◽  
Author(s):  
Hong Yao ◽  
Jian Cao
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Analytical Models ◽  
Design Stage ◽  
Beam Model ◽  
Preliminary Design ◽  
Powerful Means ◽  
Preliminary Design Stage ◽  
Blank Size

Methodologies of rapidly assessing maximum possible forming heights are needed for three-dimensional 3D sheet metal forming processes at the preliminary design stage. In our previous work, we proposed to use an axisymmetric finite element model with an enlarged tooling and blank size to calculate the corner failure height in a 3D part forming. The amount of enlargement is called center offset, which provides a powerful means using 2D models for the prediction of 3D forming behaviors. In this work, an analytical beam model to calculate the center offset is developed. Starting from the study of a square cup forming, a simple analytical model is proposed and later generalized to problems with corners of an arbitrary geometry. The 2D axisymmetric models incorporated with calculated center offsets were compared to 3D finite element simulations for various cases. Good assessments of failure height were obtained.

Meanline Modeling of Ported Shroud Turbocharger Compressor

2012 ◽  
Author(s):  
Xuwen Qiu ◽  
Eric M. Krivitzky ◽  
Peter Bollweg
Keyword(s):  
Cfd Simulation ◽  
Three Dimensional ◽  
Pressure Rise ◽  
Design Stage ◽  
General Mechanism ◽  
Gasoline Engines ◽  
Design Variables ◽  
Preliminary Design Stage ◽  
Compressor Map ◽  
Ported Shroud

The requirements for higher fuel economy and better diesel and gasoline engines demand a wider range in turbocharger compressor operation. Ported shroud compressor housing is one of the most commonly used techniques for compressor map width enhancement. Although the general mechanism of such a flow feature is well understood, there are no readily available design tools to guide the engineers at the preliminary design stage. Designers have had to rely on three-dimensional (3D) CFD tools to sort out many design variables, but these tools can be prohibitively expensive. This paper explains how to develop a ported shroud compressor model on top of a commercial meanline compressor design program. The model considers some basic parameters, such as bleed location and geometry, which drive the recirculation or bypass flow through the bleed channel. The effects of the secondary flow on the compressor performance, such as pressure rise, efficiency, and stall and choke margins are also analyzed. The model prediction is validated with CFD simulation and test data.

scholarly journals PENGARUH TATA RUANG PADA PENGHAWAAN ALAMI RUMAH VERNAKULAR MELAYU PONTIANAK

2019 ◽  
Vol 6 (1) ◽  
pp. 53
Author(s):  
Tri Wibowo Caesariadi
Keyword(s):  
New York ◽  
Wind Speed ◽  
Thermal Comfort ◽  
Earthquake Engineering ◽  
Natural Ventilation ◽  
Building Materials ◽  
Spatial Arrangement ◽  
Spatial Layout ◽  
Indoor Space ◽  
Vernacular House

Arsitektur vernakular adalah arsitektur yang memiliki respon yang baik terhadap iklim setempat. Hal ini juga berpengaruh terhadap kenyamanan termal dalam bangunan. Sebagai kota yang memiliki iklim tropis lembab, kenyamanan termal bangunan di Kota Pontianak banyak ditentukan oleh pergerakan angin yang terjadi di dalam bangunan. Adaptasi terhadap iklim pada rumah vernakular melayu Pontianak tidak hanya pada penggunaan elemen bangunan seperti bukaan dan bahan bangunan, juga pada tata ruang yang khas, di antaranya terdapat teras, ruang tengah serta pelataran belakang yang memisahkan rumah induk dengan rumah anak. Tujuan penelitian adalah melihat apakah tata ruang ini berpengaruh terhadap penghawaan alami di ruang dalam. Penelitian dilakukan dengan pengukuran di lapangan terhadap variabel kenyamanan termal, terutama temperatur dan kelajuan angin. Kemudian hasil pengukuran dianalisis secara deskriptif kuantitatif dan dilihat hubungan antara variabel dengan tata ruang, yaitu bagaimana temperatur dan kelajuan angin yang berbeda terjadi di setiap ruang, sehingga dapat ditarik kesimpulan. Hasil penelitian menunjukkan bahwa tata ruang di rumah vernakular melayu Pontianak, yaitu hadirnya teras dan pelataran belakang turut berperan dalam penghawaan alami yang terjadi di ruang dalam. Teras berperan dalam menurunkan temperatur luar yang masuk ke dalam bangunan (30,74 °C di ruang luar, lalu 29,84 °C di teras depan, dan 29,09 °C di ruang dalam). Pelataran belakang serta tata ruang dalam memberikan pergerakan angin yang lebih baik, ditunjukkan dengan selisih yang kecil antara kelajuan angin di ruang dalam dengan ruang luar pada rumah dengan pelataran belakang (0,51 m/s) dibandingkan dengan rumah tanpa pelataran belakang (0,77 m/s).Kata-kata Kunci: penghawaan alami, vernakular, tata ruangEFFECT OF SPACE LAYOUT TO NATURAL VENTILATION IN MELAYU PONTIANAK VERNACULAR HOUSEVernacular architecture is architecture that has good response to local climate. This also affects the thermal comfort in the building. As a city that has a humid tropical climate, the thermal comfort of buildings in Kota Pontianak is largely determined by the movement of the wind that occurs inside the building. Adaptation to climate in Pontianak's melayu vernacular house is not only on the use of building elements such as openings and building materials, but also on the typical spatial layout, including a terrace, a central room and a back veranda that separates the main house from the secondary house. The aim of the study was to see whether this spatial arrangement has an effect on natural ventilation in the indoor space. The study was conducted with measurements of thermal comfort variables, especially temperature and wind speed. Then the measurement results were analyzed descriptively quantitatively and viewed the relationship between variables and spatial arrangement – i.e. how the temperatures and wind speed differ in each rooms – so that conclusions could be drawn. The results showed that the layout in Pontianak's melayu vernacular house, namely the presence of terraces and back veranda, played a role in the natural ventilation that occurred in the indoor space. The terrace plays a role in reducing the outside temperature that enters the building (30.74 °C in the outdoor, then 29.84 °C on the front terrace, and 29.09 °C in the indoor). Back veranda and spatial layout provide better wind movement, indicated by small difference between the speed of wind in the indoor and the outdoor space of the house with back veranda (0.51 m/s) compared to the house without back veranda (0.77 m/s).Keywords: natural ventilation, vernacular, spatial layoutREFERENCESBoutet, Terry S. (1987) Controlling Air Movement: A Manual for Architects and Builders. New York: McGraw-Hill Book Company.Caesariadi, Tri Wibowo; Kalsum, Emilya (2011) Climatic Responsive Space in Melayu Pontianak House: A Preliminary Study. The CIB Inter-national Conference: Enhancing the Locality in Architecture, Housing and Urban Environment. January 22, 2011. Yogyakarta.Engin, N.; Vural, N.; Vural, S.; Sumerkan, M.R. (2005) “Climatic Effect in the Formation of Vernacular Houses in the Eastern Black Sea Region”. Building and Environment, Vol. 42. www. sciencedirect.comGutierrez, Jorge (2004) “Notes On the Seismic Adequacy of Vernacular Buildings”. Paper No. 5011. 13th World Conference on Earthquake Engineering. Vancouver.Koenigsberger, O.H.; Ingersoll, T.G.; Mayhew, Alan; Szokolay, S.V., (1973) Manual of Tropical Housing and Building, Part One: Climatic Design, London: Longman Group Limited.Lechner, Norbert (2001) Heating, Cooling, Lighting: Design Methods for Architects. New York: John Wiley & Sons, Inc.Lippsmeier, Georg (1997) Bangunan Tropis. Jakarta: Erlangga.Sozen, Mujgan S.; Gedik, Gulay Z. (2006) “Evaluation of Traditional Architecture in Terms of Building Physics : Old Diyarbakir Houses”. Build and Environment, Vol. 42. www.elsevier.com.Szokolay, Steven V. (2008) Introduction to Archi-tectural Science: The Basis of Sustainable Design, 2nd ed.. Oxford: Architectural Press Elsevier.

Fluid Dynamic Design and Optimization of Two Stage Centrifugal Fan for Industrial Burners

2011 ◽  
Author(s):  
C. Ferrari ◽  
M. Pinelli ◽  
P. R. Spina ◽  
P. Bolognin ◽  
L. Borghi
Keyword(s):  
Fluid Dynamic ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Design Stage ◽  
Centrifugal Fan ◽  
Cfd Simulations ◽  
Two Stage ◽  
Dynamic Design ◽  
Design And Optimization ◽  
Preliminary Design Stage

In this paper, the fluid dynamic design of a two-stage centrifugal fan for industrial burner application is presented. The design is carried out by means of an integrated 1D/3D numerical procedure based on the use of CFD simulations. The CFD simulations are used either at the preliminary design stage to choose among competitive one- or two-dimensional geometries and then to test the generated three-dimensional geometries. The results show how the different design choices could impact on the performance parameters and, finally, how the analysis of the various alternatives allows the determination of the overall geometry of a complete and performing two-stage centrifugal fan.

Design of Transverse-Plane Bulkheads in Tankers

1976 ◽  
Vol 20 (02) ◽  
pp. 67-78
Author(s):  
Carl Arne Carlsen ◽  
Dag Kavlie
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Unconstrained Minimization ◽  
Optimization Methods ◽  
Transverse Plane ◽  
Design Stage ◽  
Preliminary Design Stage ◽  
Minimization Technique ◽  
Institute Of Technology ◽  
Aided Design

A program system, INDETS, for computer-aided design of tanker structures has been developed. The system, which is the result of a joint effort of the Norwegian Institute of Technology, Trondheim, and the Aker Group, Oslo, is considered an effective tool for practical design. A design module of INDETS for tanker transverse-plane bulkheads is presented. The girder system is analyzed by a three-dimensional frame model including the surrounding structure as substructures. Two optimization methods, the Stress Ratio Technique and the Sequential Unconstrained Minimization Technique, are applied. A number of parametric variations on topology have been performed, and the depth and breadth have been varied to derive curves for estimating the weight of bulkheads at the preliminary design stage. As a conclusion, a simple-formula is presented.

scholarly journals An Integrated Design and Optimization Approach for Radial Inflow Turbines—Part I: Automated Preliminary Design

2018 ◽  
Vol 8 (11) ◽  
pp. 2038 ◽  
Author(s):  
Qing-Hua Deng ◽  
Shuai Shao ◽  
Lei Fu ◽  
Hai-Feng Luan ◽  
Zhen-Ping Feng
Keyword(s):  
Three Dimensional ◽  
Integrated Design ◽  
Multidisciplinary Optimization ◽  
Flow Coefficient ◽  
Design Stage ◽  
Optimization Approach ◽  
Preliminary Design ◽  
Design And Optimization ◽  
Preliminary Design Stage ◽  
Radial Inflow Turbine

An integrated design and optimization approach was developed for radial inflow turbines, which consists of two modules, an automated preliminary design module, and a flexible three-dimensional multidisciplinary optimization module. In this paper, the first module about the automated preliminary design approach was presented in detail and validated by the experimental data. The approach employs a genetic algorithm to explore the design space defined by the loading coefficient, flow coefficient, and rotational speed. The aim is to obtain the best design scheme with high aerodynamic performance under specified constraints and to reduce the dependency on human experiences when designing a radial inflow turbine. The validation results show that the present approach is able to get the optimal design and alleviate the dependence on the designer’s expertise under specified constraints at the preliminary design stage. Furthermore, the optimization results indicate that using the present optimization approach the total-to-static efficiency of the optimized T-100 radial inflow turbine can be increased by 1.0% under design condition and the rotor weight can be decreased by 0.35 kg (26.7%) as compared with that of the original case.

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