Optimal Dispatch of Cogeneration with Thermal Energy Storage for Building Energy Management System

This paper presents optimal dispatch strategy of cogeneration for Building Energy Management System (BEMS). The energy supply of BEMS consists of combined heat and power (CHP), an auxiliary boiler, an absorption chiller, and power grids. Previous research related to CHP for BEMS provides optimal operation to minimize total operating cost (TOC) and total CO2 emission (TCOE), but their operation releases waste heat. In this paper, we propose to add a thermal energy storage (TES) which aims to utilize the waste heat. TES constraint is taken into account of dispatch strategy. Then, we design economic and environmental optimal operation with the objective functions defined as TOC and TCOE, respectively. We evaluate the optimal dispatch with a case study of large shopping mall to demonstrate energy efficiency improvement. The numerical results manifest that the proposed dispatch of cogeneration with TES can reduce 4.15% and 1.85% of TOC and 5.25% and 6.25% of TCOE under economic and environmental optimal operation compared to the previous dispatch of cogeneration without TES.