# Optimal Design of a Residential Photovoltaic Renewable System in South Korea
## 3 Application of the Residential PV System  
The above formulated PV design model is assumed to be applied to a typical Korean residential building. For a typical Korean residential building, the monthly demand (\(D_{Electric}^{m}\)) can be assessed in four groups of consumption (general electric appliances, seasonal electric appliances, lighting appliances, and stand-by power) [6]. The first group of consumption occurs in general (year-round) electric appliances such as the television, refrigerator, and washing machine, as shown in Table 2. For example, a typical Korean residential building has two TV sets, which consume 270 W (=135 W \(\times\) 2) over 6.9 hr per day, and 28 days per month, based on a statistical survey. Interestingly, a Korean house also possesses a special refrigerator which preserves only Kimchi, because it is an essential dish for every meal in Korean daily life. Figure 1: The six-stage progressive electric rate in Korea. The second group of consumption occurs with seasonal electric appliances, such as the electric fan, air conditioner, humidifier, and electric blanket, as shown in Tables 3 and 4. For example, a typical Korean residential building has one air conditioner, which consumes 1725 W over 4.65 hr per day. However, this seasonal appliance is utilized only during the summer season (13 days for June, 15 days for July, and 27 days for August). The third group of consumption occurs with lighting appliances, such as fluorescent, incandescent, and halogen lights, as shown in Table 5. For example, a typical Korean residential building has one stand-alone (stabilizer-included) fluorescent lamp, which consumes 25.86 W over 7.9 hr per day. The final group of consumption occurs with stand-by power from various appliances, as shown in Table 6. Normally it accounts for approximately 10% of total household power consumption. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Appliance** & \
\begin{tabular}{c} **Daily Usage** \\ **Consumption (W)** \\ \end{tabular} &
\begin{tabular}{c} **Yearly Usage** \\ **Hours (hr)** \\ \end{tabular} \\ \hline Electric Fan & 60 & 7.20 & 95 \\ Air Conditioner & 1725 & 4.65 & 55 \\ Humidifier & 99 & 5.12 & 126 \\ Electric Blanket & 230 & 5.42 & 146 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Monthly usage of seasonal electrical appliances. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Appliance** & \begin{tabular}{c} **Power** \\ **Consumption (W)** \\ \end{tabular} & \
\begin{tabular}{c} **Daily Usage** \\ **Hours (hr)** \\ \end{tabular} &
\begin{tabular}{c} **Monthly Usage** \\ **Days (days)** \\ \end{tabular} \\ \hline Two TV sets & 270 & 6.9 & 28.0 \\ Refrigerator & 67 & 24.0 & 30.0 \\ Refrigerator for Kimchi & 30 & 24.0 & 30.0 \\ Washing Machine & 515 & 1.5 & 17.5 \\ Vacuum Cleaner & 899.1 & 0.6 & 21.6 \\ Personal Computer & 168 & 4.2 & 24.4 \\ Microwave & 1010.2 & 0.4 & 14.9 \\ Audio System & 40 & 3.0 & 8.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Power consumption of general electrical appliances. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Appliance** &
\begin{tabular}{c} **Days of Use in Each Month** \\ **1** \\ \end{tabular} \\ \hline Electric Fan & 0 & 0 & 0 & 14 & 16 & 23 & 25 & 16 & 0 & 0 & 0 \\ Air Conditioner & 0 & 0 & 0 & 0 & 13 & 15 & 27 & 0 & 0 & 0 & 0 \\ Humidifier & 23 & 21 & 17 & 0 & 0 & 0 & 0 & 0 & 17 & 23 & 24 \\ Electric Blanket & 27 & 25 & 20 & 0 & 0 & 0 & 0 & 0 & 20 & 24 & 27 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Power consumption of seasonal electrical appliances.