The Central Plant situated close to Sakuragicho Station is a facility with six above-ground and one below-ground floors. It started operation concurrently with the start of heat supply in April 1989.
The boiler and chiller equipment includes a large-scale latent heat storage system, as well as electric turbo chillers, absorption chillers, steam turbine-driven turbo chillers, water tube boilers, and flue and smoke tube boilers. We use this highly reliable equipment to provide clients with stable heating and cooling services.
In January 2019, we also introduced a gas-fueled co-generation system to reduce peak electricity and achieve further energy conservation through the recovery of waste heat.
This large-scale latent heat storage system, known as STL (Storage of Latent Heat), is a type of ice thermal storage system. It uses large quantities of “nodules,” spherical capsules made of high density polyethylene with a diameter of 77 mm, which contain water. Compared with water storage, it offers highly efficient thermal storage with a large capacity in a small space.
To meet the year-round demand for cooling and to improve the efficiency of the plant, we installed one of the world’s biggest sealed inverter turbo chiller, with an output of 5,400 refrigeration-tons. The rate of revolution of the compressor, as well as the pump in this chiller, are controlled with inverters, enabling substantial reductions in power consumption during periods of low demand such as between seasons and in winter.