CO_2 payback-time assessment of a regional-scale heating and cooling system using a ground source heat-pump in a high energy-consumption area in Tokyo

摘要

We present an assessment of installing a regional heating and cooling system in the Nishi(West)-Shinjuku area of Tokyo, Japan. In this assessment, we estimate the CO_2 payback- Time, when air source heat-pumps(ASHP)are replaced with a ground-source heat-pump (GSHP)system. We calculated CO_2 emissions from transportation of the cooling tower, materials for the underground heat exchanger, and the digging loads and transportation loads incurred when the GSHP system is installed to replace the air source cooling system. The total CO_2 emission from the installation of the GSHP system was estimated to be 67,710t-CO_2, with 87/100 of the CO_2 emission resulting from the digging process.