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Analysis of a Combined Power and Ejector–Refrigeration Cycle Based on Solar Energy

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

This paper presents the thermodynamic study of a thermal system which combines an organic Rankine cycle and an ejector–refrigeration cycle. The combined cycle could be driven by low-temperature heat source, that is solar energy. Required energy of combined cycle is provided by the parabolic dish collectors. According to the amount of combined cycle required energy, the number of needed collectors is calculated. For analysis of the cycle, a simulation has been performed using R123 as the working fluid. To this end, the effect of variation in heat source, the evaporator, and the cooling water temperatures as well as the expansion ratio, the input and output pressures of turbine on thermal efficiency, exergy efficiency, and exergy destruction has been investigated in each component and the entire system. Thermal efficiency and exergy efficiency of 13.41 and 24.89 % are obtained at a heat source inlet temperature of 140C. Also, it is observed that the greatest exergy destruction occurs in the steam generator.

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Abbreviations

\(A_{\text{a}}\) :

Concentrator openings area

c p :

Specific heat (kj kg−1 k−1)

E :

Exergy (kw)

G :

Glass area

h :

Specific enthalpy (kj kg−1)

I :

Exergy destruction (kw)

I Solar :

The direct input sunlight (w/m2)

m :

Mass flow rate (kgs −1)

N :

The number of collector

p :

Pressure (kpa)

PR :

Power–refrigeration ratio

Q :

Heat transfer rate (kw)

R :

Extraction ratio

Re:

Reflectivity

s :

Specific entropy (kj kg−1 k−1)

T :

Temperature (C)

w :

Specific work (kj kg−1)

U :

Energy (Mj)

u :

Entrainment ratio

η :

Efficiency

β :

Turbine expansion ratio

c :

Condenser

coll:

Collector

ejc:

Ejector

ev:

Evaporator

ex:

Expansion valve

exg:

Exergy

in:

Inlet

out:

Outlet

p :

Pump

pf:

Primary flow

ph:

Preheater

is:

Isentropic process

sf:

Secondary flow

S.s:

Solar system

S.t:

Thermal storage

t :

Turbine

th:

Thermal

tot:

Total

v :

Valve

vg:

Vapor generator

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Authors and Affiliations

  1. Mechanical Engineering Department, Technical Education Faculty, Urmia University, Urmia, West Azerbaijan, 57561-15311, Iran

    H. Sheykhlou & S. Jafarmadar

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  1. H. Sheykhlou
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  2. S. Jafarmadar
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Correspondence to S. Jafarmadar.

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Sheykhlou, H., Jafarmadar, S. Analysis of a Combined Power and Ejector–Refrigeration Cycle Based on Solar Energy. Iran. J. Sci. Technol. Trans. Mech. Eng. 40, 57–67 (2016). https://doi.org/10.1007/s40997-016-0011-y

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  • DOI: https://doi.org/10.1007/s40997-016-0011-y

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