Young-Hum Cho

Establishment of Passive Energy Conservation Measure and Economic Evaluation of Fenestration System in Nonresidential Building of Korea

ECO2 (building energy efficiency rating program) and passive energy conservation measures (ECMs) were established as a basic study for targeted methodologies and decision support systems development in Korea to meet national regulations. The primary energy consumption and economic evaluation of nonresidential buildings was performed. Passive ECMs were classified as planning and performance elements. The planning elements are the window-to-wall ratio (WWR) and horizontal shading angle. The performance elements are the thermal transmittance (U-value) of the walls, roof, and floor and the U-value and solar heat gain coefficient (SHGC) of windows. This study focused on the window-to-wall ratio and the U-value and solar heat gain coefficient of windows. An economic efficiency database for the constructed alternatives was built; the target building was set and the Passive ECM List for the target building was derived. The energy consumption evaluation and economic evaluation were performed for each of the constructed alternatives, and a methodology for guiding energy efficiency decisions was proposed based on the performance evaluation results, and the optimal Passive ECM List for the target building was derived.

Development of the Load Prediction Model using HVAC System

The purpose of this study is to develop an load prediction model using HVAC (Heating, Ventilation, Air conditioning and Cooling) system to prevent waste of energy due to fault and inefficient operation of the system. As the interest in energy saving of buildings is increasing worldwide, there is a growing need for research on facility energy efficiency measures. Load prediction is needed to prevent waste of energy. However, current methods for predicting loads in existing buildings are complex and difficult to predict in real time. Therefore, the purpose of this study is to develop a load prediction model through measurement and mathematical modeling of the input values for the load prediction using sensors in the HVAC system. The prototype is developed using the developed load prediction model and the actual building is tested. 주요어 : 부하 예측, 공조시스템, 에너지 절감

A Study on the Effectiveness of the Horizontal Shading Device Installation for Passive Control of Buildings in South Korea

In South Korea, the evaluation criteria for installing shading devices are defined by regulations, but the standards of design methods are not clearly established. The installation of shading devices has become mandatory for some public buildings due to revised regulations. Therefore, a design of horizontal shading device is required, and indoor environmental problems which may occur due to their installation should also be taken into consideration. This research aimed to propose a design which takes into account the energy consumption which may occur if the horizontal shading device is installed and suggests an improved design method of horizontal shading devices when they are installed. Consequently, it was confirmed that as the protrusion of the horizontal shading device becomes longer, the incoming daylight is reduced and the indoor intensity of illumination becomes lower, and thus more lighting energy may be consumed in a room where the shading device is installed than in the one where it is not. Therefore, annual energy consumption was calculated by applying the lighting control and it was found that the total energy consumption decreased by the reduction of air-conditioning and fans and lighting energy consumption.

Sound Insulation Performance Evaluation of Military Facility by Modular System

A modular system is an industrialized building system that is transported to the field and assembled in a short period of time. This system shortens the construction time, ensures high-quality and reduces on-site labor costs. Recently, the construction of modular military facilities has increased because of the characteristics of military facilities. Accordingly, a modular system has been used in bachelor officer’s quarters (BOQ) and barracks. An inhabited military facility needs to be of apartment house quality. In various requirements of house quality, the sound insulation performance is considered important. In this study, the sound insulation performance of a modular system was evaluated in a constructed military facility. As a result, the BOQ satisfied the performance level of the ‘Floor impact sound insulation structure Accreditation and management standard for apartment house’ and ‘Green Building Certification Criteria’.

Minimum Airflow of Single Duct VAV Terminal Boxes

Terminal boxes are the critical component of the VAV systems. The minimum airflow of terminal boxes is a key factor for comfort, indoor air quality (IAQ) and energy cost. If the minimum airflow is higher than required, terminal boxes will have significantly more simultaneous heating and cooling, and AHUs will consume more fan power. Buildings will have IAQ problems if the minimum airflow is less than required. A building simulation was conducted to evaluate the impact of energy consumption on the minimum airflow of single duct VAV terminal boxes. The results show that simulation data revealed that compared with the existing set point, the improved optimal minimum airflow set point exhibited an annual energy savings of 29%.Copyright