Engineering thermodynamics

A Comprehensive Study of a Low-Grade Heat-Driven Cooling and Power System Based on Heat Current Method

  • ZHAO Tian ,
  • XU Ronghong ,
  • XIN Yonglin ,
  • HE Kelun ,
  • MA Huan ,
  • YUAN Mengdi ,
  • CHEN Qun
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  • 1. School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China
    2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

Online published: 2024-07-15

Supported by

This work is supported by National Natural Science Foundation of China (Grant No. 52125604).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

Combined cooling and power (CCP) system driven by low-grade heat is promising for improving energy efficiency. This work proposes a CCP system that integrates a regenerative organic Rankine cycle (RORC) and an absorption chiller on both driving and cooling fluid sides. The system is modeled by using the heat current method to fully consider nonlinear heat transfer and heat-work conversion constraints and resolve its behavior accurately. The off-design system simulation is performed next, showing that the fluid inlet temperatures and flow rates of cooling water as well as RORC working fluid strongly affect system performance. The off-design operation even becomes infeasible when parameters deviate from nominal values largely due to limited heat transfer capability of components, highlighting the importance of considering heat transfer constraints via heat current method. Design optimization aiming to minimize the total thermal conductance is also conducted. RORC efficiency increases by 7.9% and decreases by 12.4% after optimization, with the hot fluid inlet temperature increase from 373.15 to 403.15 K and mass flow rate ranges from 10 to 30 kg/s, emphasizing the necessity of balancing system cost and performance.

Cite this article

ZHAO Tian , XU Ronghong , XIN Yonglin , HE Kelun , MA Huan , YUAN Mengdi , CHEN Qun . A Comprehensive Study of a Low-Grade Heat-Driven Cooling and Power System Based on Heat Current Method[J]. Journal of Thermal Science, 2024 , 33(4) : 1523 -1541 . DOI: 10.1007/s11630-024-1976-2

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