Thermodynamic performance analysis and multi-criteria optimization of a hybrid combined heat and power system coupled with geothermal energy

Yuzhu Chen, Jun Wang*, Peter D. Lund

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

Hybrid fossil/renewable energy combined heat and power (CHP) systems harness local energy sources, save fossil fuels, and reduce greenhouse gas emissions. Here geothermal energy is integrated into a natural gas driven CHP system by employing both vapor-compressor and absorption cycles through a geothermal heat pump (GSHP). To increase the performance of the heat pumps, the mixed hot water from the internal combustion engine (ICE) is used to preheat the evaporator. Using a multi-criteria optimization method based on energy, economic, environmental and adjustable factors, the optimal allocation ratio of hot water from the ICE is analyzed to maximize the performance of the hybrid CHP system for a specific case building. The necessary thermodynamic models of the system components needed for the optimization are presented. The results demonstrate that the increasing allocation ratio of mixed water for the heat pumps raised the output and coefficient of performance (COP). At optimal allocation ratio maximizing the performance of the CHP system against a set of criteria, the optimum energy saving ratio (ESR), carbon dioxide emission reduction ratio (CDERR), annual cost saving reduction (ACSR), and adjustable ratio are 30.26%, 53.20%, 40.80% and 6.40%, respectively. The hybrid CHP system also shows much higher flexibility than other relevant systems.

Original languageEnglish
Article number112741
JournalEnergy Conversion and Management
Volume210
DOIs
Publication statusPublished - 15 Apr 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Combined heat and power
  • Extra adjustable ratio
  • Geothermal heat pump
  • Multi-criteria analysis
  • Optimization
  • Sensitivity analysis

Fingerprint

Dive into the research topics of 'Thermodynamic performance analysis and multi-criteria optimization of a hybrid combined heat and power system coupled with geothermal energy'. Together they form a unique fingerprint.

Cite this