2020 Virtual AIChE Annual Meeting

(83f) Thermodynamic Mechanism of Self-Heat Recuperative Heat Circulation System with Non-Isentropic Compression and Expansion

Authors

Tsutsumi, A. - Presenter, The University of Tokyo
Chen, L., University of Tokyo
Shikazono, N., The University of Tokyo
Self-heat recuperation drastically cuts energy consumption of thermal processes by adding work to circulate whole process heat without heat addition. This paper elucidates the thermodynamic mechanism of self-heat recuperation with non-isentropic compression and expansion for a thermal gas cycle in terms of exergy analysis with a modularization method using the module expression flow, temperature-entropy, and energy conversion diagrams.

The self-heat recuperative heat circulation is driven by adding the work input to provide the minimum work required for heat transfer using the compressor, and theoretically, the excess work can be recovered to offset part of the work input using the expander. The irreversibility of adiabatic compression and expansion destructs part of the excess work, leading to a decrease in the recoverable excess work and an equivalent increase in the waste heat. The net work input which is equal to the minimum work required for heat circulation is converted into the waste heat of which the anergy is transformed from the exergy destruction due to heat transfer, non-isentropic compression, and non-isentropic expansion. It can be concluded that the minimum work required for heat circulation can be quantified by quantifying the waste heat via the total exergy destruction.