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Carbon nanotube nanofluid for the efficiency improvement in a CHP system: simulation and experimental investigation

  • Amin Kazemi-BeydokhtiEmail author
  • Mahmoud Farrokhi
  • Enzo Menna
Review Paper
  • 10 Downloads

Abstract

Due to the importance of combined heat and power (CHP) systems in ensuring the energy efficiency of thermal units as well as the ability of nanofluids to enhance the thermal efficiency of thermal equipment, a new nanofluid was synthesized and compared with some other thermal fluids. Multi-walled carbon nanotubes (CNTs) were employed as a multifunctional nanoplatform in a base fluid. Additionally, some physical and chemical surface modifications were conducted in order to improve not only dispersion but also stability of this nanofluid. The acid treatment and polymer wrapping (PEGylation) of CNTs were applied as chemical and physical modifications, respectively. These techniques assisted us to prepare a more stable thermal nanofluid in a CHP system. Furthermore, higher heat removal was achieved, compared to previously tested nanofluids. Because of the extensive and various methods in surface modification of the CNT together with the effect of this modification on the thermal behavior of nanofluid, it seems that the PEGylated and oxidized CNT nanofluid can play an important role in improving CHP heat removal and ensure higher heat recovery. Furthermore, the possibility of more power generation was investigated with the aid of Aspen HYSYS simulation software. Simulation results showed that there is a potential to produce 52.75 kW more power with implementation of an Organic Rankine Cycle (ORC) within the current system. The ORC’s thermodynamic efficiency was 10.29%.

Keywords

CHP system Carbon nanotubes Thermal nanofluid Surface modification Organic Rankine Cycle 

List of symbols

Cpav

Average constant pressure specific heat capacity (kJ (kg K)−1)

h

Specific mass enthalpy (kJ kg−1)

M

Molecular weight (g mol−1)

\(\dot{m}\)

Mass flow rate (kg s−1)

\(\dot{m}_{\text{wf}}\)

Working fluid mass flow rate (kg s−1)

P

Pressure (kPa)

PC

Critical pressure (kPa)

\(\dot{Q}_{\text{e}}\)

Rate of heat supplied to the working fluid in the evaporator (kW)

s

Specific mass entropy (kJ (kg K)−1)

T

Temperature (°C)

TC

Critical temperature (°C)

\(\dot{W}_{\text{net}}\)

Net power output from the cycle (kW)

\(\dot{W}_{\text{p}}\)

Rate of energy consumed by the working fluid pump (kW)

\(\dot{W}_{\text{t}}\)

Rate of energy produced by the expander/turbine (kW)

\(\eta_{\text{p}}\)

Pump isentropic efficiency (%)

\(\eta_{\text{t}}\)

Turbine isentropic efficiency (%)

\(\eta_{\text{th}}\)

Thermodynamic efficiency of the cycle (%)

\(\rho_{\text{wf}}\)

Density of the working fluid (kg m−3)

Abbreviations

CHP

Combined heat and power

CNT

Carbon nanotube

GWP

Global warming potential

NBP

Normal boiling point

ODP

Ozone depletion potential

ORC

Organic Rankine Cycle

PEG

Polyethylene glycol

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Chemical Engineering, School of Petroleum and Petrochemical EngineeringHakim Sabzevari UniversitySabzevarIran
  2. 2.Department of Chemical SciencesUniversity of PadovaPaduaItaly

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