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An applicable surface heating in a two-phase ejector refrigeration

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Abstract

Ejectors have been utilized in many industries such as steam power plants, nuclear reactors, desalination system, refrigeration, etc. However, due to the low coefficient of ejector performance, the ejector refrigeration systems are less used than the other methods (compression or absorption refrigeration systems). On the other hand, nucleated droplets in wet steam ejectors cause erosion/corrosion in the walls. In this research, the effects of surface heating on the ejector performance in the refrigeration system have been investigated. Flow simulation in the ejector is performed using Fluent software in two-phase mode. Then, by analyzing the outlet ejector parameters, the practical heat value is obtained. Criteria for investigating the effect of surface heating are entrainment ratio of the ejector, coefficient of performance of ejector refrigeration cycle, wetness, number of droplets, droplets radius, and entropy. The results show that the surface heating reduces the wetness and entrainment ratio at the end of the primary nozzle. In addition, an applicable value for surface heating has been obtained and a relatively good wetness reduction (0.81%) is achieved.

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Abbreviations

J :

Nucleation rate (m−3 s−1)

h :

Enthalpy (J kg−1)

k :

Turbulent dissipation rate (m2 s−3)

\({K}_{B}\) :

Boltzmann’s constant

M :

Mass of one molecule (mg)

\(\dot{m}\) :

Mass flow rate (kg s−1)

P :

Pressure (Pa)

\(Q\) :

Surface heating (Kw/m2)

\({q}_{c}\) :

Condensation coefficient (-)

r :

Radius of droplets (μm)

T :

Temperature (K)

u :

Velocity (m s−1)

X :

Spatial component (m)

COE:

Cost of electrical energy

COP:

Coefficient of performance

CR:

Compression ratio (−)

DAR:

Droplet Average Radius (μm)

ER:

Entrainment ratio (−)

ILE:

Entropy at the end of the primary nozzle

LND:

The average logarithm of the number of droplets

MOW:

Mean Wetness

α :

Thermal conductivity

β :

Liquid mass fraction (−)

Γ:

Mass generation rate (kg m−3 s−1)

\({\delta }_{ij}\) :

Rate of mixing layer growth

\(\varepsilon \) :

Turbulence dissipation (s−1)

η :

Number of liquid droplets (m−3)

μ :

Dynamic viscosity (Pa s)

\(\rho \) :

Density (kg m−3)

σ :

Liquid surface tension (N m−1)

eff:

Effective

evap:

Evaporator

d :

Discharge

Gen:

Generator

\(l\) :

Liquid

\(p\) :

Primary

\(s\) :

Secondary

\(v\) :

Gas (vapor)

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Authors and Affiliations

  1. Center of Computational Energy, Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran

    Ahmad Jahani Rahvard, Esmail Lakzian, Farzaneh Foroozesh & AbdolamirBak Khoshnevis

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  1. Ahmad Jahani Rahvard
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  2. Esmail Lakzian
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  3. Farzaneh Foroozesh
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  4. AbdolamirBak Khoshnevis
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Correspondence to Esmail Lakzian.

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Rahvard, A.J., Lakzian, E., Foroozesh, F. et al. An applicable surface heating in a two-phase ejector refrigeration. Eur. Phys. J. Plus 137, 179 (2022). https://doi.org/10.1140/epjp/s13360-021-02203-3

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