Abstract
Purpose: This study analyzed and evaluated the NZEB (Net Zero Energy Building) on energy and cost based an electricity data from KEPCO (Korean Electric Power Corporation). Method: The experiment was conducted in three houses with different location and size. The experimental houses were constructed with high thermal insulation and air tightness, and also designed as all-electric houses where all the energy supplies (including heating and cooking) are made of electricity which reduces the maintenance cost and makes maintenance easier. 6kWp of Grid connected Photovoltaic System and air source heat pump for heating and hot water were applied to all houses, and one of them had an additional of solar domestic-hot water system with 5m² of collector. Result: For two years, all energy (including plug load, heating, cooling, lighting, how water supply and ventilation) was supplied by PV system and consequentially zero energy was achieved in two houses except A. Monthly electricity bill by the amount of used were not charged, however, additional fees by domestic electricity charging system were charged such as basic electricity fee, VAT on receiving electricity and development fund; average $123 were paid per household.
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