jaue2023025: Decarbonized Heating Systems using Solar and Woody Biomass Heat in Houses

Abstract

There has been an urgent need to promote CO2 reduction in households in order to realize a decarbonized society. In the residential sector, solar thermal systems are expected to be widely used due to the high demand for heat. However, it is a variable renewable energy source, so it is considered suitable for use in combination with stock- type woody biomass. For the use of woody biomass resources, heat utilization is desirable for local production for local consumption of energy and for energy efficiency. Therefore, the heating effect and CO2 reduction by a decarbonized heating system using solar and woody biomass heat, which are sustainable energy sources, were evaluated using measured data and simulations. The system using solar heat did not provide heating effect in the early morning when the heating load is high due to the slow operation of the system, and the results suggest that the CO2 emission reduction is about 9%. The system using woody biomass heat was able to stably supply more than 1.5 times as much heat as the system using solar heat, but the proportion of energy used during biomass fuel processing was large, suggesting the need to improve the woody biomass fuel production method.