Assessing Effects of CO<sub>2</sub> Emission Reduction in Hot Spring Areas: A Case Study for Promoting Utilization of Unutilized Energy in Nagareyama and Yubari Hot Springs, Hokkaido

TL;DRAbstract

Objective. In hot spring areas, the water is generally heated by heavy oil boilers. However, substantial CO2 is emitted in the heating process, and the process is always affected strongly by oil prices. The Nagareyama Hot Spring, which is owned by the Hokkaido Railway Company, has recently introduced a waste oil boiler that is fueled by lubricating oil discarded by the railway company. Regarding a hotel with hot spring, used bath water is usually thrown away to the river and extra heat generated from a machine room is usually released to the outside. Given the current situations, we considered 2 possibilities: (1) using waste oil in place of heavy oil in Nagareyama Hot Spring, and (2) utilizing wasted bath water and released heat from the machine room for warming greenhouses in winter in Yubari Hot Spring. These modifications were designed to minimize the environmental burdens as represented by CO2 emissions and economic costs. The potential CO2 reduction was evaluated quantitatively b

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