| 요약2 |
District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. 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. Direct connection has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. Furthermore, renewable energy such as solar heat, geo-thermal heat and heat pump and others can be applied to the direct connection in district heating as supply temperature is comparatively low. However, direct connection is not economical for heavy load and it is difficult to keep the temperature of supply water low. When direct connection is applied, it is the most important to supply stable heat source to consumers. In the previous study, appropriate supply pressure for direct connection are suggested. Therefore, the objective of this study is to offer the fundamental data for applying the direct connection in district heating to Korea by investigating the unit heating load and optimal temperature based on supply condition and stability for consumers from the previous studies. The results of this study are follows ; 1) Heating loads(including domestic hot water supply) for each consumers in conventional direct connection system were proved to be excessive comparing to simulated results. 2) The optimal range of supply water temperature was 60 90 in case of supply for domestic hot water to each households. |