Ri Ryu

Study on PCM Applied Thermal Storage Wall System to Reduce Cooling Energy

The regulations to reduce energy consumption and carbon dioxide emission in building sectors are being developed and promoted all over the world. However, in Korea, as balcony extension of the apartments has been legally allowed, it became prevalent and resulted in excessive energy consumption. This study derived the possibility of PCM application to the thermal storage wall system through theoretical consideration and investigated the problems occurring when the balcony space has been extended to the diverted space. In addition, this study aims at the possibility of verifying the installation and confirming the cooling energy reduction effect, by conducting measuring tests with the actual installation of PCM applied thermal storage wall system. As a result of theoretical consideration, it is determined that the disadvantages with the existing thermal storage wall system can be complemented by applying PCM, and this study suggests the PCM applied Thermal Storage Wall System. The study was conducted on 1/6 of a miniature inner room of a domestic apartment with 84 ㎡ of exclusive area. From the results of actual measurements, it is confirmed that the balcony extension structure can gain 11.3% of more calories than the existing balcony structure, resulting in the increase in cooling energy usage. It is determined that the installation of the PCM applied Thermal Storage Wall System may gain 25.2% of less calories to reduce cooling energy usage.

A Study on the Development Aspect by Year through Smart City Trend Cases

The population that currently resides in cities throughout the world accounts for more than 50% of worlds population due to rapid global urbanization since the 19th century, causing many serious urban problems, including lack of residential facilities and urban infrastructure, traffic congestion and environmental destruction. Due to continuous advancement of communication technologies since the 20th century, the world trend of industrial technologies encountered a turning point from the 3rd industrial revolution to the 4th industrial revolution. As results of such periodic transitions, the smart city, which is intended to solve urban issues intelligently, has appeared. At the same time, smart technologies, such as ICT, IoT, Big Data, and data-crowding, all of which are considered technologies of the 4th industrial revolution, are being integrated with the urban infrastructure. In this study, the standards for unique smart city components were set by as follows. First, the cases regarding the overseas trend of the smart city appearing after the 2000s by year were classified. Second, precedent studies regarding the smart city were analyzed. Then, the development aspects of the smart city were considered and studied by analyzing the trend cases of the smart city accordingly. The purpose of this study is to recognize that the smart city is an alternative city for today and the future and to establish fundamental research data for understanding the smart city.