ANALYSIS OF HEMS DATA IN A DETACHED HOUSE (PART 3): ENERGY BALANCE ANALYSIS INCLUDING PHOTOVOLTAIC AND BATTERY ENERGY STORAGE

Since 2011, this research group has been analyzing energy consumption based on data from Home Energy Management Systems. HEMS data of about 50,000 houses were collected and analyzed. The composition of the HEMS data was clarified. Energy balance such as power generation and household consumption was clarified for the purpose of promoting energy saving of new houses and existing houses. The object of this analysis is a monogenesis zone of 6 regions, and the floor area is 100 ～ 140m2. Photovoltaic power generation is classified into (S) of average capacity 4,6,8,10kW and storage battery 5kWh or less, (M) of 5.1 ～ 8 kWh, and (L) of 8.1kWh or more, and the analysis period is 1 years from April, 2018 to March, 2019, and the sample number is 829 houses without data loss. As a general feature, as battery capacity increases, annual electricity purchases decrease and household consumption (including charging) increases. Generally, the self-sufficiency rate is improved as PV capacity and BES capacity are larger. As the number of families increases, energy consumption also tends to increase. Therefore, the energy Self-Sufficiency rate tends to decrease, and the self-sufficiency rate tends to increase as solar power generation capacity increases. The self-sufficiency rate generally tends to rise as the construction year becomes new. In addition, since the total consumption also increases as the floor area increases, the self-sufficiency is on a declining trend for all types of photovoltaic power generation capacity. When all room air conditioners are compared with air conditioners, the self-sufficiency rate is reversed to DCAC, and DAC becomes higher as PV capacity increases. The buildings constructed in 2017, when the ZEH policy was promoted, were improved in heat insulation performance, facility performance, and Self-Sufficiency Rate. In order to improve the Self-Sufficiency Ratio, it is important not only to increase the capacity of photovoltaic power generation and storage batteries but also to reduce the total power consumption. It is expected that the Self-Sufficiency Rate will be further improved by the Heat Pump type Water Heater and the surplus electric power utilization of the electric automobile. In the future research, the data quantity will increase further, and the building data after 2018 will be also available. In the future, it is important to continue to analyze and publish data on snow-covered cold regions and data on further increases in ZEH rates,