Thành phần nước cất hoàn toàn không chứa các tạp chất hữu cơ hay vô cơ, do đó cũng là dung môi thích hợp để rửa dụng cụ thí nghiệm, pha chế hóa chất hoặc thực hiện một số phản ứng hóa học. | 234 Desalination Trends and Technologies Nomenclature Capital letters CP D La Lo M P Pa Pe Pu R S T TU V Small letters Apparent conductance of heat loss W m2 C . Day of the month Latitude degree . Longitude degree . Number of months Vapour pressure Pa Incident power of absorbed radiation W m2 Power of heat loss W m2 Useful power W Radius of the pupil surface m Collecting area m2 Temperature K Universal Time h Wind speed m s a c e f h h h qc R so s z Aperture diameter of the paraboloid m . The specific heat J kg C . Thickness of the insulation on the back of the absorbers m . Focal or friction factor. Exchange coefficient W m2 C . Internal heat transfer coefficient W m2 C . External heat transfer coefficient W m2 C . Mass flow of coolant kg s . Radius of the absorber or correction of the earth-sun distance m . Surface receptor m2 . Collecting surface m2 Altitude km . Greek letters ộo a 8 sa 8c sac X p Ơ T Indices Aperture Half angle of the paraboloid degree . Absorption coefficient of the absorber . The angle of a conical light beam degree . Emissivity of the absorber . Emissivity of the cover . Apparent emissivity of the system . Thermal Conductivity W m C . Reflection coefficient of the paraboloid . STEFAN-BOLTZMANN constant. Transmittivity of the cover . Hour Angle degree . a ar Absorber or ambient. Rear wall insulation. Solar Desalination 235 cmoy moy cv Average cover. Average absorber Convection r Radiation. s Fluid outlet of the concentrator. v Steam or vault surrounding. 5. References 1 2003 .Present status of solar distillation. Solar Energy 75 pp. 367-373. 2 2003 . Experimental study on a horizontal tube falling film evaporation and closed circulation solar desalination system. Renewable Energy 28 pp. 1187-1199. 3 1988 . Traitements des eaux. 2ème édition Editions de l école polytechnique de Montréal. 4 Y. Goswami 2003 . Experimental study of an innovative solar water .
