Apparatus and method for evaluating energy performance of existing buildings using dynamic energy performance curve

Building Energy Performance evaluation method using a computer according to embodiments of the present invention includes the steps of building a database computer deulrosseo (a) building energy usage values ​​and characteristics in the past about a plurality of conventional structures; (B) determining a benchmark based on a probability distribution of the energy consumption value of the existing buildings; (C) the selection of similar buildings with the architectural characteristics similar to the evaluation of the existing building structures; (D) with respect to each evaluation object and the structure of the selected similar structures, the method comprising: on the basis of the benchmark, the Dynamics of energy obtained each performance curve that varies across the past period; And (e) in case of the dynamic energy of the selected performance curves the similar structure can include determining a change trend of the dynamic energy performance curve of the evaluation target architecture.