Cascade energy optimization for waste heat recovery in distributed energy systems

TitleCascade energy optimization for waste heat recovery in distributed energy systems
Publication TypeJournal Article
Year of Publication2018
AuthorsXuan Wang, Ming Jin, Wei Feng, Gequn Shu, Hua Tian, Youcai Liang
JournalApplied Energy
Volume230
Pagination679 - 695
Date Published11/2018
ISSN03062619
KeywordsCascade energy utilization, CCHP, Distributed energy system, Energy quality, optimization, Waste heat recovery
Abstract

The efficiency of distributed energy systems can be significantly increased through waste heat recovery from industry or power generation. The technologies used for this process are typically dependent on the quality and temperature grades of waste heat. To maximize the efficiency of cascade heat utilization, it is important to optimize the choice of waste heat recovery technologies and their operation. In this paper, a detailed mixed integer linear programming optimization model is proposed for waste heat recovery in a district-scale microgrid. The model can distinguish waste heat quality for planning and operation optimization of distributed energy systems. Heat utilization technologies are formulated in this developed model and categorized in different temperature grades. The developed model is validated using four typical cases under different settings of system operation and business models. It is found that the optimization model, by distinguishing waste heat temperature, can increase energy cost savings by around 5%, compared to models that do not consider waste heat temperature grades. Additionally, the results indicate that the developed model can provide more realistic configuration and technologies dispatch.

DOI10.1016/j.apenergy.2018.08.124
Short TitleApplied Energy