In order to understand the actual energy saving effect of a building, a criteria for evaluating the energy performance of the building is needed. The Building Energy Efficiency Rating (BEER), which is the standard for evaluating the performance of buildings in Korea, has limitations in evaluating the actual consumption, and the basis for distinguishing the evaluation rating is unclear. The purpose of this study is to propose a criteria for evaluating the energy performance of residential building using Energy Efficiency Ratio(EER), to improve the drawback of the existing BEER evaluation method. EER means, In this study, the ratio of each household energy performance to typical household energy consumption. According to the purpose of the study, the study was conducted as follows.
To calculate the energy consumption of typical household, First of all, national statistical data providing building information and energy consumption were analyzed. As a result, the Household Energy Standing Survey (HESS) by the Korea Energy Economics Institute was judged to be the most reliable, the 2017 HESS data is used in this study. Physical building information such as region, housing type, net usable area, and completion year was extracted from HESS data for 2,500 sample households. A total of 46 prototypical household groups were defined using these four criteria variables, and annual fuel and electricity power consumption per unit area(kWh/㎡·yr) were calculated.
In order for the energy performance evaluation criteria proposed by this study to have high reliability, energy consumption of prototypical households should be estimated and verified at the national level. Therefore, the equation was considered from the relative previous studies that estimated the national energy consumption, and the energy consumption of apartments nationwide was estimated. However, it is currently impossible to verify because there is no national statistical data that provides information such as region, net usable area, and completion year and energy consumption of apartments.
The EER cumulative percentage for each prototypical household group was calculated using the energy consumption of the prototypical household groups and HESS sample households based on the annual primary energy consumption per unit area(kWh/㎡·yr). Groups with insufficient number of sample households have low quality of EER cumulative percentage calculation results. Therefore, this study proposes an energy performance evaluation criteria using the EER cumulative percentage of nine prototypical household groups. Users can inspect the energy performance of each household through a lookup table made of this EER cumulative percentage, and the cumulative percentage divided at intervals can be used as BEER evaluation method. This interval can be adjusted according to the target to be evaluated or the energy consumption data used.
The criteria for evaluating residential energy performance proposed in this study used various information of household such as region, housing type, net usable area, and completion year, so it is possible to compare more accurate energy consumption in similar households. Since the current results are calculated as energy consumption in 2016, should be updated using the HESS data released every year.