Abstract
This study analyzed the heating and cooling performance of an office building in Daegu, Korea, equipped with amorphous-Si (a-Si) building-integrated photovoltaic (BIPV) windows. EnergyPlus was used to simulate and compare the heating and cooling loads of models for clear glass double-layer, heat-absorbing glass double-layer, and low-emissivity (low-e) glass double-layer windows. In addition, the impact of changes in building operation time, temperature settings, air infiltration from the entrances, and internal load were also analyzed as these all have a large impact on heating and cooling loads. Finally, three types of heating and cooling equipment were tested, and their power and primary energy consumption analyzed, to determine the actual energy used. Under baseline conditions, there was an 18.2% reduction in heating and cooling loads when the BIPV model was used compared to when the clear glass double-layer window was used. In addition, increases in temperature settings and air infiltration from the entrances had a negative effect on the reduction of the heating and cooling loads demonstrating a need for intensive management of these features if a-Si BIPV windows are installed in a building.
Highlights
Saving energy in buildings and an increase in the use of renewable energy are being promoted worldwide as measures to combat climate change [1]
We measured the power generated from building-integrated photovoltaic (BIPV) and that used for lighting, electric equipment, and by the electric heat pump (EHP) to heat and cool an actual building
The total capacity of a-Si BIPV windows is 15.31 kWp, of which 10.56 kWp was on the south face and 4.75 kWp was on the east face
Summary
Saving energy in buildings and an increase in the use of renewable energy are being promoted worldwide as measures to combat climate change [1]. Korea has enacted a policy that makes it mandatory for buildings to be zero-energy by 2025, spurring active research into the component technologies of these kinds of buildings [2]. Zero-energy buildings minimize energy consumption and convert any remaining energy from fossil fuels to renewable energy annually [3]. To minimize energy consumption in buildings, various new technologies, including highly efficient equipment, are being developed to improve building components such as insulation, airtightness, and solar control and research on integrated economic design techniques is underway [5]. Renewable energy sources for buildings include biomass, geothermal, solar, and wind power there have been proposals to develop and apply technology to convert these energy sources into those suitable for local needs [6]
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