抄録
A river water heat utilization system has been introduced to Building 21 A, Okawabata River City. This is a super-highrise apartment building constructed by the Housing and Urban Development Corporation at 1-chome Tsukuda, a development area on the banks of the Sumida River. This system supplies hot water by a gas absorptive heat pump, the heat sources being the water of the Sumida River for the low temperature and city gas for the driving heat.
Compared with conventional gas boiler systems, this system provides a 43% reduction in primary energy. In practical use, however, considering the additional burning when the supply water temperature becomed low and the drop of COP caused by scaled heat exchanger tubes, reduction of moderate approx. 40, 000Nm3/year in terms of gas volume is expected.
As the heat selling project for this area is 5Gcal/hour or less in capacity, the Heat Supply Law will not be applied and it will be operated as project incidental to the city gas project by the Tokyo Gas Company. Small-sized heat supply projects as this are named “spot heat supply” by the company. The success or failure of spot heat supply (=small-sized heat supply) depends mainly on the cut down of the equipment cost and personnel cost.
