Study of efficiency of a multistage centrifugal pump used in engine waste heat recovery application

A test bench of a multistage centrifugal pump was constructed using R123 as working fluid in simulative organic Rankine cycle (ORC) conditions. Experimental results of the pump under various operating conditions were obtained based on controlled working frequency and mass flow rate. The effect of the key pump parameters on the ORC performance was analyzed in this study. In addition, the control strategy of the pump was presented. Results show that the overall pump efficiency was between 15% and 65.7%. The outlet pressure, pump efficiency, and ORC thermal efficiency increased with the working frequency of the pump. The mass flow rate needed to be regulated as the frequency became increasingly high. The maximum thermal efficiencies of the ORC system corresponding to various working frequencies of the pump were observed. Furthermore, back work ratio (BWR) can reach up to 0.45 with the increase of the evaporating temperature of the ORC system. Pumping power should not be neglected for small-scale ORC applications, and pump efficiency assumptions should be dependent on experiments. Low pump efficiency affected the increase of the thermal efficiency and net power of the ORC system. The superheat degree was also discussed.

[1]  Jinliang Xu,et al.  Operation of an organic Rankine cycle dependent on pumping flow rates and expander torques , 2015 .

[2]  W. Worek,et al.  Optimum design criteria for an Organic Rankine cycle using low-temperature geothermal heat sources , 2007 .

[3]  Per Lundqvist,et al.  A comparative study of the carbon dioxide transcritical power cycle compared with an organic rankine cycle with R123 as working fluid in waste heat recovery , 2006 .

[4]  Jinliang Xu,et al.  Operation and performance of a low temperature organic Rankine cycle , 2015 .

[5]  Richard N. Christensen,et al.  EXPERIMENTAL TESTING OF GEROTOR AND SCROLL EXPANDERS USED IN, AND ENERGETIC AND EXERGETIC MODELING OF, AN ORGANIC RANKINE CYCLE , 2009 .

[6]  Pradeep Bansal,et al.  Feasibility of hydraulic power recovery from waste energy in bio-gas scrubbing processes , 2010 .

[7]  W. Gu,et al.  Theoretical and experimental investigation of an organic Rankine cycle for a waste heat recovery system , 2009 .

[8]  Wei Wang,et al.  Preliminary experimental study of single screw expander prototype , 2011 .

[9]  Zhen Wang,et al.  Performance analysis of waste heat recovery with a dual loop organic Rankine cycle (ORC) system for diesel engine under various operating conditions , 2014 .

[10]  Vincent Lemort,et al.  Dynamic modeling and optimal control strategy of waste heat recovery Organic Rankine Cycles , 2011 .

[11]  M. M. Rahman,et al.  A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade , 2011 .

[12]  Zhen Liu,et al.  Effects of suction port arrangements on a scroll expander for a small scale ORC system based on CFD approach , 2015 .

[13]  Hongguang Zhang,et al.  Performance analysis of exhaust waste heat recovery system for stationary CNG engine based on organic Rankine cycle , 2015 .

[14]  Lourdes García-Rodríguez,et al.  Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC) , 2010 .

[15]  Seok Hun Kang,et al.  Design and experimental study of ORC (organic Rankine cycle) and radial turbine using R245fa working fluid , 2012 .

[16]  Mortaza Yari,et al.  Thermodynamic analysis and optimization of a novel dual-evaporator system powered by electrical and solar energy sources , 2013 .

[17]  Hui Xie,et al.  Dynamic behavior of Rankine cycle system for waste heat recovery of heavy duty diesel engines under driving cycle , 2013 .

[18]  Kai Yang,et al.  Development and experimental study on organic Rankine cycle system with single-screw expander for waste heat recovery from exhaust of diesel engine , 2014 .

[19]  Ricardo Chacartegui,et al.  Alternative cycles based on carbon dioxide for central receiver solar power plants , 2011 .

[20]  Hongguang Zhang,et al.  Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System , 2016 .

[21]  Tzu-Chen Hung,et al.  Experimental study on low-temperature organic Rankine cycle utilizing scroll type expander , 2015 .

[22]  Ibrahim Dincer,et al.  Comparative performance analysis of low-temperature Organic Rankine Cycle (ORC) using pure and zeotropic working fluids , 2013 .

[23]  Chao Liu,et al.  Effect of the critical temperature of organic fluids on supercritical pressure Organic Rankine Cycles , 2013 .

[24]  Elias K. Stefanakos,et al.  Solar assisted sea water desalination: A review , 2013 .

[25]  Vincent Lemort,et al.  Techno-economic survey of Organic Rankine Cycle (ORC) systems , 2013 .

[26]  Vincent Lemort,et al.  Experimental study on an open-drive scroll expander integrated into an ORC (Organic Rankine Cycle) system with R245fa as working fluid , 2013 .

[27]  Gequn Shu,et al.  Simulation and thermodynamic analysis of a bottoming Organic Rankine Cycle (ORC) of diesel engine (DE) , 2013 .

[28]  A. S. Nafey,et al.  Combined solar organic Rankine cycle with reverse osmosis desalination process: Energy, exergy, and cost evaluations , 2010 .

[29]  Christopher Depcik,et al.  Review of organic Rankine cycles for internal combustion engine exhaust waste heat recovery , 2013 .

[30]  Hongguang Zhang,et al.  Parametric optimization and performance analysis of ORC (organic Rankine cycle) for diesel engine waste heat recovery with a fin-and-tube evaporator , 2015 .

[31]  Pedro J. Mago,et al.  Modeling of reciprocating internal combustion engines for power generation and heat recovery , 2013 .

[32]  Yong‐Le Nian,et al.  Studies on geothermal power generation using abandoned oil wells , 2013 .

[33]  Aleksandra Borsukiewicz-Gozdur,et al.  Pumping work in the organic Rankine cycle , 2013 .