We calculated the difference of energy saving effect of household fuel cells between with and without reverse power flow in an apartment. In order to calculate, we created the simulation model by using measured data of the equipment's operating conditions and energy demands in an apartment house where reverse power flow occurred. It was clarified that the household's primary energy reduction rate by fuel cell was improved by 6.9%pt on average by performing reverse power flow, and the effect was high in apartments with a large hot water supply load with respect to the power load.
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