▋Case Study on a Wind Tower of a Row House
Row house (A row of terrace house) has disadvantages of ventilation and natural lighting when considering building physics. We cooperated with Mr. Yuan-Hung Chao, the principal of Tsdesign and also the Lecturer of our department (Department of Architecture of National Cheng Kung University), to develop a ventilation tower for small-scale housing. In this project, we not only verified the CFD Simulation result with actual measurement, but also managed to receive Taiwan Patent issued by Intellectual Property Office, Ministry of Economic Affairs.
|Ventilation Tower designed by Mr. Yuan-Hung Chao||Measurement of ventilation quantity and experiment of visibilizing air flow||Result of CFD simulation|
▋Luce Chapel Conservation Research: Investigation/Improvement of Thermal Environment
Luce Chapel on the campus of Tunghai University is one of the most symbolic modern architecture in Taiwan. As the masterpiece ages, alternation for functions that meets the modern needs and the maintenance that saves the original design spirit have become a critical issue. Tunghai University obtained funding from the Getty Foundation, and hence planned to study the building with an integrating view to renovating it in architectural composition, structure, building physics, equipment, etc.. The purpose for our lab is to bring forward advice for the renovation construction project on the basis of the assessment of interior thermal circumstances adjusting with HVAC system and the analysis of improvement on thermal comfort and building energy saving.
|Wind velocity boundary condition and simulation result of external wind field||Wind velocity simulation result varys along with air-conditioning blow-out angles|
▋Expanded Metal Mesh
In recent years, many buildings have used Metal Expanded Mesh as facade design elements. In addition to the visually penetrating aesthetics, the also provide shade effects or as a facade green system with planting. According to the Technical Code for Energy Conservation Design of Buildings, external shading coefficient－KI can be calculated by the aperture ratio of the perforated shading to evaluate the energy saving effect on the building. Many literature indicates that perforated shading have an impact on the energy efficiency of the building envelope in addition to the aperture ratio, material, color, radiance and perforation type. The Expanded Metal Mesh is three-dimensional opening type, and some foreign literature also indicates that the opening pattern has a considerable difference in the solar radiation shielding effect at a specific angle.
The research team established a cooperative education with Shang Kai Steel Company Ltd, to explore the relationship between the aperture ratio, type and actual shading effect. Further explore its impact on building energy consumption and indoor lighting with software tool: EnergyPlus and Radiance.
|Experiment house-Expanded Metal Mesh shading performance test (Exterior/Interior)||Light Environment Simulation: interior of experiment house|
▋The Improvement of Floor Impact Sound Reduction by Using Covering and Damping Material of Wooden Flooring
For the increasing demand of living environment quality, the capability of building structures applied for resisting floor impact sound is highly valued recently. Floor impact sound has been taken into consideration in the standard published by authorities in Taiwan, both Residential Performance Evaluation System and Green Building Assessment Manual.
In Taiwan, most congregate housing are RC-structured. Many researches indicate that the effect of thickening the RC-structured floor to decrease the floor impact sound appears limited, while using covering and damping materials can reduce floor impact sound efficiently. A comparison analysis was performed on the wooden flooring with self-manufactured damping pads in order to identify the pads with the best impact absorbing effect. The self-manufactured damping pad, primarily made from recycled rubber grain, glass wool and polyester, is glued by polyurethane which regards as a rubber particle composite pad. The result shows that the composite pad consisting of both low rigidity and high rigidity materials can reach a better sound insulation performance of floor impact sound, for the former provides flexibility created by porosity and the latter offers structure.
|Floor impact sound test schematic diagram||New-type wooden flooring structure schematic diagram||The sound reduction level of rubber particle composite pad applies to new-type wooden flooring structure (ΔL )|
▋Fireproof Soundproof Door
In Taiwan, wooden door and fans often appear in general single room, restaurants, business offices and other places. In the field of acoustics, the performance of sound insulation performance is not outstanding because of material properties of wood. This research cooperate with Ping Shen Enterprises Company Ltd, to develop multiple sets of test pieces, conduct Sound intensity method and Sound pressure method for 1:1 building components sound insulation performance test in the TAF certified ISO 17025 laboratory, then improve the sound insulation performance of wooden fire door fans.
|Reverberant Chamber schematic||Practical work in the chamber|
▋Indoor environmental quality of Wooden based construction for high-rise residential buildings in Taiwan
Sustainable development and climate change are getting more important than ever. From the green building labeling system to the carbon footprint calculation and the life cycle of building certification in Taiwan, it is widely acknowledged that the use of wooden materials contributes to a lower level of carbon dioxide emission but in practice, the design of energy saving remains a main approach.
One may find several ideas of CLT wooden structure congregate housing in overseas literature, such as fire-proof and aseismatic structure, and ex-post evaluations of indoor environment quality and on-site testing. In addition to fire-proof and aseismatic research, more studies related to indoor environment quality are needed for domestic development. Our study focused on the wooden structure high-rise congregate housing under the climate in Taiwan and conducted an ex-post evaluation of physical indoor environment in the existing CLT buildings. Also, the influence of structure to the indoor environmental quality was investigated for the purpose of structure and material localization, namely, to reach the quality of imported construction products by means of domestic materials and designs.
Our results shall significantly improve the techniques of wooden structure high-rise buildings in Taiwan, including the control of building environment and the structure of architecture. A complete localization of structure body and decoration materials is now possible for practical use in the domestic industry. The research procedures and objectives are listed below:
(1) An ex-post evaluation of a five-level CLT wooden structure residence was conducted to identify the potential problems of wooden structure congregate housing in practical use. The evaluation consisted of acoustic, thermal and air environment examination, and a questionnaire survey for the users.
(2) The influence of CLT wooden wall-type structure to the quality of airborne and floor impact sound was analyzed. It was discussed whether decoration and buffer materials of different types may improve the overall acoustic environment in order to formulate a structure localization strategy.
(3) The quality of CLT materials (including surface coating) in moisture buffering was assessed; the influence of CLT materials to indoor moisture environment was as well studied in order to formulate a moisture control technique which integrates either natural or mechanical ventilation.
|Indoor ventilation||ASHRAE Standard 55 Adaptive model||Statistics of the indoor thermal comfort range|