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Evaluation of novel power and refrigeration system energy and exergy perspective

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Abstract

A new power and refrigeration cycle is examined in the present study. The system proposed is a combination of organic Rankine cycle (ORC) and an ejector refrigeration cycle (ERC). An ERC is introduced into the ORC to recover heat from partial expansion of the ORC fluid. The heat recovery is enhanced with the incorporation of recuperator, evaporator and superheater as heat exchangers. Among the various working fluids opted for, R245fa and R236ea have been considered in the present work. The properties of the combined cycle state points are evaluated through Engineering Equation Solver (EES) software. The impact of decision variables (such as hot source temperature, turbine expansion ratio, extraction ratio, and separator temperature) on performance parameters (such as exergy destruction, energy efficiency of power generation, exergy efficiency of power generation, energy efficiency of combined system, exergy efficiency of combined system, COP, and cooling power ratio) is examined and reported. The series heater configuration in ORC has improved system performance by recovering waste heat more effectively. At the same parametric conditions, the energy and exergy performances of R245fa are higher than those of R236ea.

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Abbreviations

m:

Mass flow rate (kg s−1)

h:

Specific enthalpy (kg kJ−1)

T:

Temperature (°C)

W:

Work output (kW)

G:

Generator

M:

Mechanical

P:

Pressure (Bar)

Q:

Heat supplied (kW)

s:

Specific entropy (kJ kg−1 K−1)

I:

Irreversibility (kJ kg−1 K−1)

ex:

Specific exergy (kJ kg−1)

E:

Exergy (kJ)

Ėx:

Exergy rate (kW)

0:

Environment condition

X:

Cooling-to-net power ratio

HE:

Heat exchanger

CND:

Condenser

ƞ :

Efficiency

Ɛ:

Exergetic efficiency (%)

P:

Pump

v:

Vapour

l:

Liquid

cwin:

Cooling water inlet

cwout:

Cooling water outlet

D:

Destruction

w:

Specific work (kJ kg−1)

q:

Specific heat (kJ kg−1)

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Acknowledgements

The authors acknowledge the novel system “Integrated organic Rankine cycle power generation and ejector. Refrigeration systems using waste heat recovery from multifuel research engine and a method thereof” application no. 202241004714 A. published as patent. The authors would like to acknowledge the support received from Kingston Engineering College, Vellore, Tamil Nadu, India‐632014, for this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Annamalaiar College of Engineering, Thiruvannamalai, Tamil Nadu, India

    M. Omprakash

  2. Department of Mechanical Engineering, Kingston Engineering College, Vellore, Tamil Nadu, 632059, India

    N. Shankar Ganesh

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  1. M. Omprakash
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Correspondence to N. Shankar Ganesh.

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Omprakash, M., Ganesh, N.S. Evaluation of novel power and refrigeration system energy and exergy perspective. J Therm Anal Calorim (2024). https://doi.org/10.1007/s10973-024-13067-x

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