Journal ArticleDOI
A biomass-fired micro-scale CHP system with organic Rankine cycle (ORC) – Thermodynamic modelling studies
Hao Liu,Shao Yingjuan,Jinxing Li +2 more
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In this article, the authors presented the results of thermodynamics modelling studies of a 2kW biomass-fired CHP system with organic Rankine cycle (ORC) and three environmentally friendly refrigerants, namely HFE7000, HFE 7100 and n-pentane, have been selected as the ORC fluids.Abstract:
This paper presents the results of thermodynamics modelling studies of a 2 kW (e) biomass-fired CHP system with organic Rankine cycle (ORC). Three environmentally friendly refrigerants, namely HFE7000, HFE7100 and n-pentane, have been selected as the ORC fluids. The thermodynamic properties of the selected ORC fluids which have been predicted by commercial software (EES) are used to predict the thermal efficiency of ORC. The results of modelling show that under the simulated conditions (1) the ORC thermal efficiency with any selected ORC fluid is well below (roughly about 60% of) the Carnot cycle efficiency; the ORC efficiency depends on not only the modelling conditions but also the ORC fluid – the highest predicted ORC efficiency is 16.6%; the predicted ORC efficiency follows the following order: n-pentane > HFE7000 > HFE7100 (2) both superheating and sub-cooling are detrimental to the ORC efficiency (3) the electrical efficiency of the CHP system with the selected ORC fluids is predicted to be within the range of 7.5%–13.5%, mainly depending on the hot water temperature of the biomass boiler and the ORC condenser cooling water temperature as well as the ORC fluid, and corresponding to about 1.5 kW and 2.71 kW electricity output (4) the overall CHP efficiency of the CHP system is in the order of 80% for all three ORC fluids although the amount and quality of heating supplied by the CHP system depend on the ORC fluid selected and the modelling conditions.read more
Citations
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Journal ArticleDOI
A review of working fluid and expander selections for organic Rankine cycle
Junjiang Bao,Li Zhao +1 more
TL;DR: In this article, a comparison of pure and mixture working fluids' applications and a discussion of all types of expansion machines' operating characteristics for an effective organic Rankine cycle system is presented.
Journal ArticleDOI
Review of organic Rankine cycle for small-scale applications
TL;DR: In this article, a comprehensive review of literature about the ORC that contains ORC configurations, ORC applications and ORC working fluid selection and modelling and experimental study of ORC expansion devices is presented.
Journal ArticleDOI
Systematic optimization of subcritical and transcritical organic Rankine cycles (ORCs) constrained by technical parameters in multiple applications
TL;DR: In this paper, the authors focused on the thermodynamic optimization of organic Rankine cycles (ORCs) for power generation and CHP from different average heat source profiles (waste heat recovery, thermal oil for cogeneration and geothermal).
Journal ArticleDOI
Tri-generation systems: Energy policies, prime movers, cooling technologies, configurations and operation strategies
Muhyiddine Jradi,Saffa Riffat +1 more
TL;DR: A comprehensive review of the latest developments in the field of combined cooling, heating and power generation is presented and discussed in this article, where the operation strategy is the critical factor governing the tri-generation system performance, the recent strategies developed and implemented to optimize the system performance and improve its overall efficiency.
Journal ArticleDOI
Experimental investigation of a biomass-fired ORC-based micro-CHP for domestic applications
TL;DR: In this article, the authors present the preliminary results of an experimental investigation on the biomass-fired organic Rankine cycle (ORC)-based micro-CHP system, which mainly consists of a biomass boiler, an evaporator, an ORC expander, an alternator, a heat recuperator and a condenser.
References
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Journal ArticleDOI
Working fluids for high-temperature organic Rankine cycles
TL;DR: In this article, a thermodynamic screening of 31 pure component working fluids for organic Rankine cycles (ORC) is given using BACKONE equation of state, the fluids are alkanes, fluorinated alkane, ethers and fluorinated ethers.
Journal ArticleDOI
A Review of Organic Rankine Cycles (ORCs) for the Recovery of Low-grade Waste Heat
T.C. Hung,T.Y. Shai,S.K. Wang +2 more
TL;DR: In this article, the efficiencies of ORCs using cryogens such as benzene, ammonia, R11, R12, R134a and R113 as working fluids have been analyzed parametrically and compared.
Journal ArticleDOI
Effect of working fluids on organic Rankine cycle for waste heat recovery
TL;DR: In this article, an analysis of the performance of organic Rankine cycle (ORC) subjected to the influence of working fluids is presented, which reveals that the thermal efficiency for various working fluid is a weak function of the critical temperature.
Journal ArticleDOI
An examination of regenerative organic Rankine cycles using dry fluids
TL;DR: In this article, an analysis of regenerative organic Rankine cycles using dry organic fluids, to convert waste energy to power from low-grade heat sources is presented, and the evaluation for both configurations will be performed using a combined first and second law analysis by varying certain system operating parameters at various reference temperatures and pressures.
Journal ArticleDOI
Performance analysis and optimization of organic Rankine cycle (ORC) for waste heat recovery
TL;DR: In this paper, the system performance analysis and optimization of an organic Rankine cycle (ORC) system using HFC-245fa (1,1, 1,3, 3,3-pentafluoropropane) as working fluid driven by exhaust heat is presented.
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