In this study, First of all CGS installation utilization patterns in the district heat supply system are categorized. Nextly, the form of 24 existing district heat supply systems utilizing CGS in the metropolitan area were investigated, and the CGS installation utilization patterns for 17 systems were identified. Subsequently, among the 17 systems, the details of renovation and new additions in 9 systems, in which CGSs were renovated or recently added. Finally, the effect of CGS renovation was evaluated by setting up indices for normal use and emergency use.
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