Jae Sik Kang

Development and Evaluation of SHGC Measurement System for Cooling Energy Saving in Buildings

The purpose of this study is to develop the measurement system for SHGC that has the biggest effect on the cooling energy saving in buildings and prove the validity of the measurement result through the experiment using the device. In this study, solar simulator using artificial light source, external environment chamber that can control the external environmental condition and calorimetric chamber that can measure the amount of irradiance coming indoors by using heat flow meter were developed. In this study, it is considered to be possible to measure the SHGC of high performance glass, shading device, heat insulation film

Thermal Performance of Sandwich Insulation System According to the Type of Form-Tie

Highly insulated envelope or external insulation systems are being applied in recent energy saving buildings to reduce the heat loss through envelope. Internal insulation systems are applied to most apartments in Korea because they are inexpensive and convenient to construct. However, the internal insulation systems have poor performance due to the heat bridges through structures such as slabs. The external insulation systems have better thermal performance because the heat bridges through the structure are rarely formed. But it has problems regarding the external insulator separation due to strong winds, spread of fire due to insulator combustion in case of fire, formation of heat bridges through the connectors between structure and external insulation. To supplement the weaknesses of the internal and the external insulation systems, a sandwich insulation system has been suggested. In this study, the thermal performance of sandwich insulation system for apartment buildings was evaluated according to two type of the form-tie material.

An Analysis of the Evaluation Methods for Thermal Transmittance of Curtain Wall System Based on Simulators

With the window rating system being enforced, window companies are required to assign window ratings to their products. As the window ratings is based on the experimental results of fenestration, they are required to spend a lot of time and money conducting laboratory tests in order to assign window ratings to all their products. Through the window performance evaluation system using simulation, the thermal transmittance of products calculated based on numerical simulation can be used in place of experimental results to obtain the window rating. To ensure the credibility of simulation results, it is necessary to use the correct evaluation methods and primary information derived from in use practice should be available for the numerical simulation. The purpose of this paper is to investigate the evaluation methods that the simulator actually uses for the thermal performance of fenestration in WINDOW/THERM. The evaluation methods used by twenty-one simulators were investigated using primary evaluation methods for numerical simulation as the criteria. This study found that most of the simulation results were not trustworthy even though they were similar to experimental results because the evaluation methods used by simulators are incorrect. Furthermore, to enhance the credibility of simulation results, the simulator should be provided with the detailed information used in practice related to the evaluation performance of numerical simulation.

Design and Energy Performance Evaluation of Energy Efficiency Windows with Nanotechnology Convergence Type

The purpose of this study, including an aluminum frame high efficiency window system is to develop and validate. In this study, simulation program based on the Window and Therm simulation program, aluminum frame profile, thermal bridges through optimization design of barrier efficiency of the 6type aluminum window system was constructed. In the results of high-efficiency windows system performance assessment, U value 0.8 ~ 1.1W/m2·K, air-tightness performance ratings of 1 showed the windows energy efficiency rating that meets the Class 1 or 2 ratings showed. This study is based on an aluminum frame with a high-efficiency windows were secure system design technology, future public housing, commercial buildings is expected to be applied to a variety of buildings.

Heating Energy and Cost Evaluation of Sandwich Insulation Concrete System

It is essential to eliminate heat loss through the building envelope to reduce the energy consumption in buildings. However a significant loss of heating energy caused by thermal bridge between slab and external wall in internal insulation systems which were applied in the most apartments in Korea. To improve the performance of envelope, a sandwich insulation system was proposed. This paper evaluates the thermal performance, energy performance and economic efficiency of sandwich insulation system by comparing with internal insulation system. When the sandwich insulation system was applied, heating energy consumption was reduced by 17.8% compared with internal insulation system.

Evaluation on the Energy Performance of PAS Wall Applying Vacuum Insulation

This study evaluates the insulation performance of the PAS so as to analyze the exterior insulation system, PAS(Panel Approach System), which is fixed to the structure by conducting a mock-up test and then calculates the linear thermal transmittance of the interior insulation and PAS-applied areas through a 3-dimensional steady state heat transfer analysis so as to conduct a comparison analysis of heat performance on the interior insulation system in thermal bridge areas. According to the results of the mock-up test conducted to evaluate the insulation performance of the PAS, the thermal transmittance value measured 0.15W/㎡K which shows outstanding insulation performance when compared to the Korean outer wall standard of apartment buildings that is 0.27~0.36W/㎡K. Moreover, as a result of calculating the linear thermal transmittance of the PAS in contrast to the interior insulation system through a heat transfer analysis of thermal bridge areas, the interior insulation measured 0.851W/mK, and 0.029W/mK when the PAS was applied. Thus, the insulation performance in thermal bridge areas was reduced by 96.6% in contrast to the interior insulation when the PAS was applied.

A Study on the Analysis of Airtightness Performance of Dilapidated Dwelling According to the Application of Windbreak

The airtightness performance of dilapidated dwellings is low. Infiltration occurs due to such low airtightness performance, causing the energy loss. Energy loss due to infiltration accounts for more than 30% of total energy loss in a building. Therefore, the airtightness performance should be considered by priority when retrofit of dilapidated dwelling is carried out. To improve the airtightness performance, numerous studies are underway. As a result, various products have been developed. The purpose of this study is to evaluate the performance of windbreak for improving the airtightness performance of dwelling and analyze the improvement level of airtightness performance of the room quantitatively after the windbreak is actually applied to dilapidated dwelling. In order to measure the airtightness performance of window where windbreak was applied, we measured the airtightness performance of window before and after windbreak was applied. Also, for the field performance evaluation, 27 dwellings were selected to measure the airtightness performance of the windbreak applied room. The measurement result showed that the infiltration rate of window where windbreak was applied decreased by approximately 48.66% in comparison to that before the windbreak was applied. And, The ACH50 (Air Change per Hour at 50 pascals of pressure) of the room where the windbreak was applied decreased by approximately 31.61%, confirming that the airtightness performance of window was improved through the application of windbreak.

The Effects of Window Film on the Performance of Window System

Window film is generally attached the glazing in buildings to improve the thermal performance of the window system by addressing a range of problems such as indoor temperature rise, indoor temperature imbalance, degraded heating and cooling load due to excessive influx of solar radiation. To evaluate the performance of window films, window films are attached to 3mm or 6mm clear glass. However, window films are generally used on existing window systems for reducing the annual energy consumption. Therefore it is necessary to evaluate the performance of window films depending on the performance of glazing such as clear double glazing or low-e double glazing. Thus the purpose of this study is to analyze the performance of window systems when window film is attached. As a result, in the case of applying window films for reducing the SHGC of buildings, it is necessary to select window films suitable for the configuration and performance of the glazing to be installed, considering the SHGC of the entire glazing system.

Design of the Envelope System to Implement the Zero-Energy on High Rise Multi-Unit Dwelling in Korea

The market size of green building is presumed to be occupying about 5% on construction market in 2008. Since then, the green building market kept enlarged up to about

A Study on Design Improvement for Application of Sandwich Insulation System

3.7 trillion. Eventually, the market is forecast to grow about