The feasibility of direct connection in district heating system in Korea through the case studies
Jong Soo Seong, Young Min Jeong , Chul Goo Lee and Jang Yeul Sohn

District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. But as the current indirect connection in Korea is applied to the case of big scale, it brings about heat loss in its network. Moreover, high-priced heat exchanger facilities are required. However, the application of direct connection can cause the decrease of heat loss through the heat supply and return of low temperature. So, the purpose of this paper is to offer basic materials for the application of direct connection suitable for Korea through comparative analysis of some cases that the direct connection is applied. In order to ensure the stability of its consumers, it is reasonable to apply the operating conditions of the temperature of less than 90 ℃ and the pressure of less than 6 bar are applies to the results of this research.

Key words: District Heating System(DHS), Direct Connection, Supply Pressure, Supply Temperature, Foreign Examples