In Seoul, most of the new private buildings were mandated renewable energy installations more than 12% of total energy use in 2015. There are solar power, solar heat, geothermal, sunlight collecting, fuel cell, and small cogeneration systems in applicable renewable energy. Accordingly, some reconstruction apartments want to apply geothermal heat pump systems as heating and cooling. This has resulted in reducing the demand for district heating since district heating had been supplied in these areas. From the point of view of district heating suppliers, new competitor such as heating by geothermal heat pump system seems to appear in district heating market. District heating system is considered preferentially to apply in heating area abroad due to its high efficiency. However, district heating isn't recognized properly as a renewable energy in domestic situation. Therefore, in this study, we analysed primary energy use and greenhouse gas reductions of district heating and geothermal heat pump system. As a result, primary energy use and greenhouse gas reduction of district heating system are bigger than them of geothermal heat pump system. (C) 2017 The Authors. Published by Elsevier Ltd.
