Imperial College London
Alternate

DrPaulSapin

Faculty of Engineering, Department of Chemical Engineering

Research Associate
 
 
 
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Contact

 

p.sapin Website

 
 
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Location

 

B432abcBone BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Chatzopoulou:2018,
author = {Chatzopoulou, MA and Sapin, P and Markides, C and Chatzopoulou, MA and Sapin, P and Markides, C},
publisher = {ECOS},
title = {Optimisation of off-design internal combustion-organic Rankine engine combined cycles},
url = {http://hdl.handle.net/10044/1/62183},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - Organic  Rankine  cycle  (ORC) enginesare  an  efficient  means  of convertinglow-to-medium renewable  orwaste heat to useful power. In practicalapplications, ORC systemsexperience varying thermalinputprofile,due to the dynamic nature of realheat sources. Maximisingthe uptake of this technology requiresoptimisedORC designsand sizing tomaintain high efficiencyand power output,not only at full-load operation, but also under off-design conditions. Key for maintaining the efficient operationof the systemis the maximisation of heat  extraction  from  the  heat  source, inthe ORC evaporator.  In  this  paper,  the  off-design  operation  of  an ICE-ORC combined heat and power (CHP) system is investigated, to optimise the ORC performance under varying  ICE  load  conditions.  First,  the  ORC enginethermodynamic  design  is  optimised  for  the  100% load operation  of  the  ICE.  Alternative  working  fluids  are  investigated,  including  low  ODP/GWP  refrigerants  and hydrocarbons. The ORC system is then sized using two different heat exchanger (HEX) architectures; tube-in-tube (DPHEX) and  plate (PHEX) designs,  at designconditions. The sizing  results  reveal  that  the  PHEX area requirements are almost 50% lower  than the respective  ones for DPHEX,  while recovering equivalent quantities of  heat.  Next,  the  ORC engine operation  is optimised atpart-load ICE conditions, and  the  HEX heat  transfer  coefficients  (HTCs)  are  predicted. Results  indicate  that: i)  PHEX  HTCs  are  up  to  50%  higher than  DPHEX equivalents;ii)HTCsdecreaseat part  load  for  both  HEXs,  but  because  the average temperaturedifferenceincreases,  the  overall  HEX  effectiveness  improves;  and  iii)  the  ORC system with a PHEX evaporator has  slightly  higher  power  output  thanthe  DPHEX equivalent at  off-design  operation.Overall,  the modelling tool developed  here can  predict  ORC  performance  over  an  operating envelopeand allows the selection ofoptimal designsand si
AU  - Chatzopoulou,MA
AU  - Sapin,P
AU  - Markides,C
AU  - Chatzopoulou,MA
AU  - Sapin,P
AU  - Markides,C
PB  - ECOS
PY  - 2018///
TI  - Optimisation of off-design internal combustion-organic Rankine engine combined cycles
UR  - http://hdl.handle.net/10044/1/62183
ER  -
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