An Analysis of Cost Effectiveness and Subsidy Policy on a PV System as a Building Material for Wall Cladding

The purpose of this study is to analyze cost effective applications of a building integrated photovoltaic system and to suggest vigorous applications of a PV system as a building material for wall cladding. The PV system, which produces electricity by solar energy among new and renewable energies, has merits to be applied to in cities with relative ease although it has not been favored broadly due to its low efficiency and the high first cost. Therefore, the solution has been searched by the heat transmission coefficient calculation and the cost effective analysis of a PV system in this paper when the PV system replaces a building material for wall cladding such as a brick and a marble. To have better performance of the PV system, it is necessary to vent the heat that is generated from the system and is trapped between the wall and the system. When the PV system is used as a building material for wall cladding, more than 2cm of air gap is required for the regional heat transmission coefficient in Korea. Internal insulation for the construction method is expected to minimize the risk of fire than external insulation. The higher the price of the building materials is, the shorter the payback period is. Under the current subsidy policy on the PV system, the replacement of cheap building materials cause the longer payback period. Consequently, the subsidies are needed to be revised for the application of a PV system as a building material for wall cladding.