1. Graduate School, Department of Architectural Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnam 330-717, Republic of Korea
2. Green Home Energy Technology Research Center, Kongju National University, 275 Budae-dong, Cheonan, Chungnam 330-717, Republic of Korea
3. Graduate School, Department of Energy System Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnam 330-717, Republic of Korea
4. Department of Architectural Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnam 330-717, Republic of Korea