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Although using zeotropic mixtures in the organic Rankine cycle (ORC) system can improve its performance, the selection of the mixture working fluid is still a great challenge due to the lack of selection criteria. In the present work, the thermodynamic selection criteria of zeotropic mixtures is proposed based on the exergy analysis of the subcritical ORC. The mixture composition can be directly determined...
A comprehensive model for organic Rankine cycle (ORC) was presented in this work. Several sub-models were included. Fewer empirical coefficients were needed in the improved expander model than the previous one as several parameters were obtained directly from the actual structure parameters of scrolls. The Dalton's law was used to simulate the pressure in the liquid tank, consisting of partial pressures...
EPC (Energy Performance Contracting), as a mechanism grounded in markets, is important for the energy saving industry. The issue of energy savings benefit allocation in Shared Savings Energy Performance Contracting Projects is one obstacle frustrating the rapid growth of the energy performance contracting mechanism. Currently, studies on this issue primarily adopt the equilibrium principle of gains,...
This study proposed a polygeneration system based on coal partial gasification, in which methanol and power were generated. This proposed system, comprising chemical and power islands, was designed and its characteristics are analyzed. The commercial software Aspen Plus was used to perform the system analysis. In the case study, the energy and exergy efficiency values of the proposed polygeneration...
Retrofitting existing power plants for CO 2 capture poses numerous constraints. The layout of the original process and the structure of the existing equipment cause various special problems in the design process as well as influence system performance. In view of these, this paper carries out process simulations, characteristic analysis, and system integration of CO 2 capture based...
In this paper, the phase transition characteristics of CO 2 and CO 2 /H 2 mixture are analyzed, and ideas for improving the cryogenic separation method are drawn. On this basis, a novel CO 2 cryogenic liquefaction and separation system is put forward. In the novel system, two-stage compression, two-stage refrigeration, two-stage separation, and sufficient recovery of...
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