An Experimental Study of Parabolic Solar Water Heater Performance located in Basra city

In this paper the effect of focus and tilted angle of parabola solar water heart are studied, the result show that, the optimum focus is 25 cm, where the tilted angle of parabola cannot be adopted because it has different value from time to time, also the study focus on heating pipe glassing with different tube diameter, and show the glassing heating pipe with 1-inch tube diameter give good performance from other size and that without glassing.