Optimal temperature conditions of finite heat-recovery cycles from a non-isothermal heat source

Keisuke Takeshita, Yoshiharu Amano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, an analysis of the temperature condition producing maximal power from a sensible heat source by finite heat-recovery thermodynamic cycles is presented. Some studies have been conducted that theoretically analyzed a system utilizing thermal energy from heat sources by multiple thermodynamic cycles in cascade with the assumption of constant heat-source temperature. However, many heat sources for heat-recovery thermodynamic cycles are sensible, in which the temperature changes considerably with the cycles during heat exchange. Therefore, it is necessary to consider the temperature change of the heat source. First, a temperature condition that maximizes the power generated by a combination of single/multiple Carnot cycles from constant-specific-heat heat sources is analyzed, and the optimal temperature is derived analytically. Subsequently, simulations of the Rankine cycle and several patterns of the Kalina cycle are compared to the analytical model. These comparisons reveal that the Carnot cycle model provides an effective estimation of the temperature conditions for the heat-recovery cycles that produce maximal power from a sensible heat source.

Original languageEnglish
Title of host publicationECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
EditorsWojciech Stanek, Pawel Gladysz, Sebastian Werle, Wojciech Adamczyk
PublisherInstitute of Thermal Technology
Pages1337-1348
Number of pages12
ISBN (Electronic)9788361506515
Publication statusPublished - 2019
Event32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019 - Wroclaw, Poland
Duration: 2019 Jun 232019 Jun 28

Publication series

NameECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

Conference

Conference32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2019
CountryPoland
CityWroclaw
Period19/6/2319/6/28

Keywords

  • Kalina cycle
  • Maximum power
  • Optimization
  • Rankine cycle
  • Sensible heat source

ASJC Scopus subject areas

  • Energy(all)
  • Engineering(all)
  • Environmental Science(all)

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  • Cite this

    Takeshita, K., & Amano, Y. (2019). Optimal temperature conditions of finite heat-recovery cycles from a non-isothermal heat source. In W. Stanek, P. Gladysz, S. Werle, & W. Adamczyk (Eds.), ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (pp. 1337-1348). (ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems). Institute of Thermal Technology.