集中冷暖房から個別空調への変更による省エネルギー効果  [in Japanese] Energy Saving Performance of Distributed Heating and Cooling System  [in Japanese]

An advanced distributed heating and cooling system utilizing small-scale high performance heat pumps was designed to replace the central heating and cooling system for the AIST laboratory buildings, which have a total floor area of 36,100m2, of which 20,100m2 is occupied by laboratories. In the old system, the total primary energy required for hot water was 44TJ and it was 12TJ for chilled water in FY2001. The new system is composed of small-sized high-performance heat pumps, with an average coefficient of performance (COP) of 3.1. After the reconstruction, the energy consumption was reduced to 37%, and with a total energy saving of 44TJ for one year. And the total CO2 emission is estimated to be 26%, a reduction of 3,000tons of per year. The energy saving is caused by the high performance small-scale heat pumps, the high-performance total system design that takes laboratory into account and the suitable operation of the system.