Hyo-Jun Kim

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

The objective of this study was to propose a stratification control method for the minimum air flow of a variable air volume (VAV) terminal unit. The minimum air flow rate of the VAV terminal unit is the key factor affecting thermal comfort, indoor air quality (IAQ), stratification and energy consumption depending on the operating mode of the VAV system. Therefore, selecting the proper minimum air flow is very important. In this study, a building simulation was conducted to evaluate the indoor thermal comfort, stratification, IAQ and energy consumption according to the fixed minimum air flow rate of the VAV terminal units. In addition, an algorithm was proposed considering the stratification and variable minimum air flow rate depending on the indoor load. The results of the fixed minimum air flow rate simulation showed that the minimum air flow rate considering stratification satisfies all the conditions of indoor thermal comfort, IAQ and without stratification. The proposed method was found to be more effective than the existing control method. The energy comparison with the existing control method showed that the proposed method reduces the energy consumption.

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

Energy Performance Evaluation and Economic Analysis of Insulation Materials of Office Building in Korea

Building energy conservation measure (ECM) of insulation materials suitable for the domestic situation in the construction sector (passive) is established. The ECMs of insulation materials were classified into walls, roofs, and floors. Also, economic evaluation databases, which are composed of material costs, labor costs, and expenses for constructed alternatives, were built. After setting the target building and deriving the ECM list of insulation materials for the target building, the energy use evaluation and economic evaluation were performed for each constructed alternative. Based on this, the optimal building energy conservation measure of the target building was derived by applying the decision-support process.

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.