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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects Volume 41, 2019 - Issue 13
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Articles

Exergy analysis of a novel low-heat recovery organic Rankine cycle (ORC) for combined cooling and power generation

Fidelis I. AbamEnergy, Exergy and Environment Research Group (EEERG) Mechanical Engineering Department, Michael Okpara University of Agriculture Umudike, Umuahia, NigeriaORCID Iconhttps://orcid.org/0000-0001-6794-0118
ORCID Icon,
Tobinson A. BriggsEnergy, Exergy and Environment Research Group (EEERG) Mechanical Engineering Department, Michael Okpara University of Agriculture Umudike, Umuahia, Nigeria;Department of Mechanical Engineering, University of Port Harcourt, Port Harcourt, Nigeria
,
Ekwe B. EkweEnergy, Exergy and Environment Research Group (EEERG) Mechanical Engineering Department, Michael Okpara University of Agriculture Umudike, Umuahia, Nigeria
,
C. G. KanuEnergy, Exergy and Environment Research Group (EEERG) Mechanical Engineering Department, Michael Okpara University of Agriculture Umudike, Umuahia, Nigeria
,
Samuel O. EffiomDepartment of Agricultural and Bioresources Engineering, Michael Okpara University of Agriculture, Ota, NigeriaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-4248-9871
ORCID Icon,
M. C. NdukwuDepartment of Mechanical Engineering, Covenant University Otta, Umudike, Nigeria
,
S. O. OhunakinDepartment of Mechanical Engineering, Cross River University of Technology, Calabar, Nigeria
&
M. I. OfemDepartment of Mechanical Engineering, Cross River University of Technology, Calabar, Nigeria
 show all
Pages 1649-1662 | Received 17 Jun 2018, Accepted 14 Oct 2018, Published online: 26 Nov 2018
 
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ABSTRACT

A thermodynamic modification of an ORC integrated with turbine bleeding and regeneration (ORCTBR) is presented. The objective is to modify the ORCTBR for both cooling and power generation (ORCNOV). First, a thermodynamic break down of the components based on exergy was performed followed by a sensitivity analysis. The results indicate that at based conditions the maximum efficiency obtained with ORCNOV was about 52% using R245fa at a heat input of 252 kW. The improvement in efficiency was estimated at 7.2% when compared with ORCTBR. The highest cooling rate was achieved using R1234yf, R245fa, and R1234ze by 11.14, 10.60, and 10.11 kW, respectively. Additionally, the ORCNOV showed improved performance in turbine output power of approximately 2%. However, the sensitivity studies show that the exergy destruction gap was not greater than 45% between the ORCTBR and ORCNOV, and high cooling rates are feasible at increased condenser (1) pressure.

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