Research on ultra-low energy consumption renovation of teaching buildings in severe cold areas under EPC mode

Abstract

In order to explore the energy saving benefits and economy of ultra-low energy consumption renovation of existing buildings in cold areas under the contract energy management (EPC) mode under different renovation schemes. On the basis of the existing net present value and net present value increment, the net present value rate is proposed as the evaluation index of the transformation plan, so as to realize the comprehensive benefit evaluation of a variety of transformation schemes. The results show that the energy-saving transformation scheme of the project with an external wall of 120 mm rock wool board, a 150 mm extruded polyphenylene board on the roof, and a three-glass single Low-E argon-filled glass on the exterior window has the greatest comprehensive benefits and meets the ultra-low energy consumption standard, the energy saving rate of the envelope transformation reaches 28.07%, and the static recovery period is 5.27 years. This paper provides a design method and reference basis for the ultra-low energy transformation of existing buildings in cold areas using EPC mode.