With rapid growth in renewable energy marketplaces, low energy buildings can be achieved with on-site renewables such as photovoltaic (PV) in a cost-effective manner. Battery systems are one of&nbsp;key factors in the effective use of renewable energy systems in residential buildings as self-production of electricity by renewables for self-consumption has become profitable for building applications. This study evaluates the appropriate capacity of the Battery Energy Storage System (BESS) installed in all-electric zero energy powerhouse (AEZEPH)low-energy residential buildings, which all the energy covered by electricity based on actual electricity use patterns and self-consumption with solar power systems grid-connected PV system.In this study, six real houses for this analysis are six AEZPHs located in Daejeon, South Korea. are used to examine patterns of electricity use within the residential buildings. The floor plans of six households are slightly different, but they are all real house is configured as a three-story residential building with a squire shape floor plan. All the houses have the same structure and size with a total floor area of 955.36200m²., and its construction consists of wood-framed exterior walls with high-performance insulations. All the houses have a lightweight wood flame structure and have the same configuration, such as a passive element and heat recovery system applied with high levels of insulation and airtight. The heating and cooling are provided by a low-temperature water radiant floor heating system and a fan coil unit (FCU), respectively. The FCU provides cooling to each room, and it is a water-source heat pump (HP) system supplied by a 3RT-scale geothermal heat pump system. In terms of PV capacities, 3kWp of the PV system is installed for 4 houses, and the other 2 houses have 4kWp of an installation capacity. Using an IH cooker for cooking, all energy including heating, cooling, domestic hot water system, ventilation, lighting, and plug load, etc. is supplied with electricity, and the surplus electricity produced through PV generation can be used in the grid-connected system. The monitoring For an energy resource of this low energy residential building, only electricity is used to provide cooling, heating, domestic hot water systems, and cooking as well. Hourly data of electricity consumed by each house and PV power generation are measured from Jan. 2014 to Dec. 2014 is used to capture the patterns and evaluate the appropriate capacity of BESSs.Results show that the annual average value of daily power generation is 3.79 kWh/kWp-day for the six houses by indicating that all the houses show similar patterns and amount of annual PV power generation. The annual average value of electricity consumption of 6 houses is about 11.5kWh/day, and the largest and lowest usages are around 16.8kWh/day and 7.38kWh/day, respectively. The self-consumption and ESS installation capacity are analyzed by selecting each representative house for the lowest, highest, and middle usages. The self-consumption of the three representative houses present 27.6%, 22.6%, and 36.8% for the lowest, highest, and middle usages, respectively, based on PV installations. The estimated ESS installation capacity was analyzed as 5 kWh, 4 kWh, and 8 kWh for each representative house.

Investigation on Optimal Ees Capacity to Maximize Self-Consumption of Pv System With Exsisting Energy-Efficinet Houses in Korea

Paper Proceedings: https://asmedigitalcollection.asme.org/ES/ES2021/volume/84881

ASME 2021 Energy Sustainability (ES2021)

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