District heat supply system: A system that supplies heat to multiple buildings from a centralized heat supply source. The objective is to improve energy efficiency and reduce air pollution.

District heat supply system: A system that supplies heat to multiple buildings from a centralized heat supply source. The objective is to improve energy efficiency and reduce air pollution.

Heat supply source: An energy source for supplying heat. Includes gas boilers, oil boilers, unused energy, etc.

Centralized Management: Centralized management of multiple heat supply sources and systems. Enables efficient energy use and operation.

Energy Efficiency: Efficiency of energy use. Getting the maximum effect with the least amount of energy.

Air Pollution: The release of hazardous substances into the atmosphere. District heating systems control this.

Heat Supply Business Law: Law enacted in 1972. Provides regulations and support systems to promote the introduction of district heat supply systems.

Gigacalorie: A unit of energy; one gigacalorie equals 1,000,000 kilocalories.

Unutilized energy: Energy sources that have not been used in the past. It includes waste heat from sewage treatment plants and waste incineration plants.

Heat pump: A device that transfers heat. Used to transfer heat from low to high temperatures.

Sewage treatment plant: A facility that treats sewage. Can supply low-temperature water heat as unused energy.

Refuse incineration plant: A facility that incinerates refuse. Waste heat is often utilized as unused energy.

Primary energy: Energy obtained directly from nature. Includes fossil fuels, nuclear power, renewable energy, etc.

CO2 reduction: Reduction of carbon dioxide emissions. This is achieved through the installation of district heat supply systems.

NOx reduction: Reduction of nitrogen oxide emissions. Contribute to the control of air pollution.

Exhaust heat: Heat released after energy use. It is reused as unused energy.

Thermal storage layer: A layer that stores heat. Heat can be supplied as needed.

Electric heat pump: A heat pump driven by electricity. Used in district heat supply systems.

Tokyo Sewage Energy: A company that supplies energy from Tokyo's sewage treatment plants.

Hokuriku Urban: A company that operates a district heat supply business using river water in Toyama City.

Hokkaido District Heating: Provider of district heat supply business using waste heat from a waste incineration plant in Sapporo.