論文 - 趙　旺熙

A calibration method for whole-building airflow simulation in high-rise residential buildings 査読有り

Yoon S., Seo J., Cho W., Song D.

Building and Environment   85   253 - 262   2015年02月

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2014 Elsevier Ltd. The simulation results for airflow in high-rise buildings may not match actual behavior due to various airflow paths and impact factors, such as temperature, wind direction, wind velocity, and building characteristics (airtightness, layout, and others). When conducting whole-building airflow simulation for high-rise buildings, it is important to reasonably define uncertain input parameters in order to minimize the difference between measurement and simulation results. This study proposes a calibration method for airflow simulation modeling of high-rise buildings using the data-driven method and estimating uncertain input data through output data.The output data for comparing measured values with simulated values were focused on pressure distributions in buildings, because this value indicates the driving force of the airflows between building partitions and in the entire building. Based on the measured pressure distribution of the analyzed building, the unknown input parameters were deduced primarily using the Thermal Draft Coefficient (TDC). The uncertain input parameters (leakage area, flow coefficient, and exponent) were then optimized using Genetic Algorithm (GA). Through the processes suggested in this study, the uncertain input parameters for whole-building airflow simulation can be optimized, and the discrepancy between simulation results and measured values can be minimized. The advantage of this method is that the input parameters can be optimized for reasonable simulation modeling using limited measurement results in high-rise buildings.

DOI： 10.1016/j.buildenv.2014.12.004

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Study on energy-efficiency of desiccant outdoor air-conditioning unit for a dedicated air-conditioning system 査読有り

Kawamoto K., Cho W., Kohno H., Iwamoto S., Koganei M., Ooka R., Kato S.

Refrigeration Science and Technology   3025 - 3032   2015年01月

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

The purpose of this study is to realize energy efficient features for a dedicated desiccant air-conditioning system throughout the season, and propose a new high-efficiency application of this system. Many advanced air-conditioning systems are intended to reduce energy and/or space only for sensitive heat conditioning. During the dehumidification season, the results show that a latent heat conditioning system using a desiccant air-conditioner achieves over 20% higher energy efficiency than conventional systems. A new humidification system that combines a desiccant outdoor air-conditioning unit and heat-pump is proposed for the winter season. The experimental results show that the humidification performance satisfies the minimum demand for an outdoor air conditioner in many areas of Japan, but the energy efficiency is slightly inferior to that of traditional boiler systems. Some improvements in the structure and operation of this system are suggested to improve the higher energy efficiency.

DOI： 10.18462/iir.icr.2015.0128

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A study on dew condensation risk evaluation for commercial building: Dew condensation risk evaluation by different airtightness and different thermal insulation property 査読有り

Teranishi S., Cho W., Iwamoto S., Makino Y., Kono H., Kato S.

Journal of Environmental Engineering (Japan)   80 ( 718 )   1133 - 1142   2015年01月

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担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

In this study, as the prerequisites for countermeasure of the dew condensation, in order to identify locations and frequency of dew condensation, the estimation of dew condensation on all wall and window in commercial buildings was conducted by TRNSYS simulation coupled with TRNFLOW. The airtightness and the thermal insulation property affect on dew condensation, accordingly the dew condensation risk evaluation with different airtightness and different thermal insulation property was performed. The dew condensation risk was calculated by using dew condensation risk evaluation index proposed by the authors in previous studies.

DOI： 10.3130/aije.80.1133

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Desiccant air-conditioning system consisting of heat pump and solar heat collector 査読有り

Shoda N., Kohno H., Koganei M., Iwamoto S., Cho W., Yuzawa H., Kato S.

ICOPE 2015 - International Conference on Power Engineering   2015年01月

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

In this study, a desiccant outdoor air-conditioning system that uses high-temperature chilled water (approximately 20 °C) and low-temperature hot water (approximately 55 °C) produced by a high-efficiency heat pump, and hot air produced by solar heat collectors, was proposed. This system treats the total heat load of outdoor air and indoor latent heat load in commercial buildings. In the proposed system, solar heat is effectively used for regeneration of the desiccant in summer and for pre-heating of ventilation air in winter. We have constructed a prototype of this system and evaluated the coefficient of performance (COP) of the entire desiccant air-conditioning system using the measured values of electric energy consumption and treated enthalpy between the outdoor air and supply air.

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