Encyclopedia of Environmental Science and Engineering, Volume I and II

222 DESALINATION

Table of SI Units for Desalination

Symbol Unit

Area C m^2

Average efficiency k —

Concentration C kg/m^3

Feed concentration C 1 ppm

Permeate concentration C 2 ppm

Conductance S s^3 A/kg m^2 or V/A

Cross flow velocity u m/s

Current density — A/m^2

Density r kg/m^2

Diffusion coefficient D m^2 /s

Energy, Heat quantity, Work E-W J or N ⋅ m or kg ⋅ m^2 /s^2

Energy density — J/m^3

Entropy S J/K

Electric potential V V

Heat capacity C J/kg K

Heat flux Q W/m^2

Heat flux density q W/m^2

Heat transfer coefficient h W/m^2 K

Heat transfer rate Q′′ W/m^2

Flow rate q m^3 /s

Flux, mass J kg/m^2 s

Flux, volume J m/s

Force F N or kg/m^2 s

Gained output ratio GOR kg/kg

Insulation, per day H J/m^2 d

Insulation, instantaneous I J/m^2 s

Latent heat of condensation ∆Hc, hfg J/kg

Latent heat of vaporization ∆Hv, hfg J/kg

Membrane constant (solvent) A m s/Pa

Membrane constant (dissolved sub) B m/s

Membrane thickness d mm

Molar energy — J/kg

Number of cell pairs N —

Number of effects N —

Osmotic pressure p Pa

Performance ratio R kg/2326kJ

Permeability, solvent Lv m/Pa s

Permeability, solute Ls l/m^2 kmol s

Power P W or J/s or kg m^2 /s^3

Potential difference V W/A

Pressure p Pa or N/m^2 or kg/m s^2

Specific, energy u J/kg

Specific, entropy s J/kg K

Specific, heat capacity c J/kg K

Surface tension s N/m

Temperature, thermodynamic T K

Time t s

Thermal conductivity l W/m s

Viscosity, dynamic η N ⋅ s/m^2 or Pa s

Viscosity, kinimatic v m^2 /s

Volume V m^3

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