Abstract
One of the measures to achieve the 2050 carbon-neutral goal is to promote the use of household cogeneration systems powered by hydrogen fuel cells. However, this has not progressed as planned due to the high cost of fuel cells. As a countermeasure, a hydrogen engine that can replace fuel cells is a low-cost alternative, but its practical application faces the problems of reduced thermal efficiency and abnormal combustion, which are concerns due to the properties of hydrogen. In this report, the thermal efficiency was investigated using an engine suitable for household cogeneration, and extremely high thermal efficiency was obtained.
