Abstract
Presented here is a mathematical model study of a prototype solar still built at Jug Island near Gunsan City. A pair of ODE was solved numerically with auxiliary equations to demonstrate that the predicted water productivity was in good agreement with experimental values. Monthly average water absorptance was the major factor that influnced the solar still performence.It was also found that the initial water depth the degree of insulation and the ambient temperature had significant influnce upon the water productivity whereas the wind velocity, the cover slope and the still orientation exhibited and the still negligible effects.
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Abbreviations
- Ag :
-
surface area of cover, m2
- Au :
-
surface area of saline water m2
- Cg :
-
area specifice heat of cover, cal/m2 ℴC
- Cu :
-
specific heat of saline water, cal/m2 ℴC
- Fs :
-
shape facter of a still
- hb :
-
local heat transfer coefficient to ground and side wall cal/m2 ℴC
- hga :
-
convective heat transfer coefficient to the air, cal/m2hr ℴC
- Hi :
-
solar radiation, cal/m2hr
- Ht :
-
daily solar radiation, cal/m2day
- hw :
-
latent heat of vaporization, cal/g
- K:
-
extinction coefficient of the cover material, cm1
- m:
-
mass of the saline water in unit area g/m2
- Pg :
-
partial pressure of water vapor at cover temp, atm
- Pu :
-
partial pressure of water vapor at sahne water temp atm
- Qb :
-
ground and side wall heat losses cal/m2hr
- Qca :
-
convective heat flux from the cover cal/m2hr
- Qca :
-
convective heat flux from sahne water, cal/m2hr
- Qem :
-
water production rate, liter/m2hr
- Qeu :
-
evaporative heat flux from saline water, cal/m2hr
- Qra :
-
radiative heat flux from the cover cal/m2hr
- Qru :
-
radiative heat flux from saline water cal/m2hr
- R:
-
refractive index of the cover material
- s:
-
cover thickness cm
- t:
-
time, hr
- ts :
-
time from sunrise to sunset hr
- T:
-
temperature, K
- Ta :
-
ambient temperature, ℴC
- Tg :
-
cover temperature, ℴC
- Tu:
-
saline water temperature, "C
- V:
-
interniittency factor
- W:
-
wind velocity, m/sec
- α:
-
angular absorptance of saline water
- α g :
-
cover absorptance
- α u :
-
water absorptance
- ε g :
-
emissivity of the cover
- θ :
-
angle of incidence, degree
- ρ d :
-
reflectance
- ρ :
-
diffuse reflectance
- σ :
-
Stefan Boltzmann constant
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Yoon, B.J., Rhee, HK. & Park, WH. Modelling and simulation of a local solar still. Korean J. Chem. Eng. 3, 113–119 (1986). https://doi.org/10.1007/BF02705022
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DOI: https://doi.org/10.1007/BF02705022