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Energy and economic analysis of evaporative vacuum easy desalination system with brine tank

  • H. Kariman
  • S. HoseinzadehEmail author
  • A. Shirkhani
  • P. S. Heyns
  • J. Wannenburg
Article
  • 28 Downloads

Abstract

Nowadays, the freshwater is one of the most critical issues for humans. In this regard, desalination systems can be beneficial. In this research, at first different types of desalination systems and their governing equations is studied. Then the energy consumption of evaporative vacuum easy desalination system with brine tank is modeled. This modeling and the equations governing the energy consumption of new subsets such as the evaporator, condenser, vacuum pump, and other pumps are presented. In the end, the economic modeling of the system is investigated. The feasibility of using the system is reported in three cities (Abu Dhabi, Las Palmas, and Perth). The results shown that the annual operating cost of the pumps is estimated to be 0.19 M€ yr−1, 0.51 M€ yr−1 and 0.14 M€ yr−1 for Abu Dhabi and Las Palmas and Perth respectively. Also, the annual cost of fresh water production is compared with other reaches in these cities. The results are shown that Perth has the lowest cost of the fresh water output at 0.67 M€ yr−1 and Las Palmas has the highest cost of fresh water production with 0.104 M€ yr−1. The reason is the difference in the electricity prices in these cities.

Keywords

Thermal energy analysis Desalination system Fresh water Vacuum pump Economic analysis 

List of symbols

A

Active surface of the heat transfer (m2)

Cf

Heat capacity of feed water (J kg−1 K−1)

Cp

Heat capacity of the water at constant pressure (J kg−1 K−1)

Cpl

Heat capacity of saturated water (J kg−1 K−1)

Cpd

Heat capacity of distillated water (J kg−1 K−1)

CMED

Cost of MED (€)

Ccond

Cost of condenser (€)

E

Energy need to provide hot water (w)

G

Gravity (m/s2)

H

Average heat transfer coefficient (w M−2 k−1)

Hb

Enthalpy of brine (J kg−1)

Ht

Enthalpy of tank water (J kg−1)

Hf

Enthalpy of feed water (J kg−1)

Hfg

Heat of evaporation (J kg−1)

Hfg2

Heat capacity of the water condensation (J kg−1)

Hfgg

Corrected value of the special water heat capacity (J kg−1)

Ja

Jacobin coefficient

Kl

Temperature conductivity in saturated liquid state (W m−1 K−1)

L

Length (m)

M0b

Brine flow rate (L h−1)

M0c

Cooling water flow rate (L h−1)

M0f

Feed water flow rate (L h−1)

M0h

Heating water flow rate (L h−1)

Mna-cl

Mass of salt (g)

MT

Tank flow (L)

AOClab

Annual operative cost of labor

AOCheating-fluid

Annual operative cost of heating fluid (€ yr−1)

TAC

Total annual cost (€ yr−1)

Q

Heat exchanged (J s−1)

S

Salinity (g L−1)

Tambient

Temperature of ambient (°C)

Th

Temperature of heating water (°C)

Tb

Temperature of brine (°C)

Tf

Temperature of feed water (°C)

Ts

Temperature of surface (°C)

Tsat

Temperature of saturation (°C)

Greek letters

\(\rho l\)

Density at saturated liquid (kg m−3)

\(\rho v\)

Density at saturated vapor (kg m−3)

\(\mu l\)

Dynamic viscosity at saturated liquid (Pa s)

\(\Delta {\text{TLMTD}}\)

Logarithmic temperature difference (°C)

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • H. Kariman
    • 1
  • S. Hoseinzadeh
    • 2
    • 3
    Email author
  • A. Shirkhani
    • 3
  • P. S. Heyns
    • 2
  • J. Wannenburg
    • 2
  1. 1.Faculty of Mechanical and Energy EngineeringShahid Beheshti UniversityTehranIran
  2. 2.Centre for Asset Integrity Management, Department of Mechanical and Aeronautical EngineeringUniversity of PretoriaPretoriaSouth Africa
  3. 3.Young Researchers and Elite Club, West Tehran BranchIslamic Azad UniversityTehranIran

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