Abstract:
Solar energy is one of the clean and environmentally friendly renewable energies gathered from
the sun. It is the primary sources for all forms of energy. Water is one of the most important natural
resources in the world. The safe drinking water availability is a high priority issue for the quality
of life and human existence. A large number of people still have no access to safe drinking water
in the study area. To this end, the present study design to make treated drinking water by parabolic
dish solar collector through pasteurization. The main goal of this work is to carry out design and
experimental evaluation of solar water pasteurization with integrated heat exchanger for water
treatment. The water was supplied to the system from a 50-liter tank that kept at elevation point
near to the system. The parabolic dish concentrator, which was covered with an Aluminum sheet,
was used to reflect the beam radiation to the black painted cylindrical receiver that was mounted
at the focal point of the collector. In addition, the study used double pipe heat exchanger to transfer
heat from pasteurized water to the unpotable incoming water before entering to the receiver. The
manual sun tracking system was also used to adjust collector aperture towards the direction of
solar radiation. In addition, the mass flow rate of water was controlled manually based on the
temperature level. There is sufficient sunlight that converted into the energy required for solar
water pasteurization by parabolic dish solar collector in the study area. On the clear sky and
sunny days, the test results indicated a high receiver temperature 219℃ at the value of solar
radiation 816 W/m2 with the maximum volume flow rate 0.005 kg/s. As a result, the finding
indicated that on an average, 60 liters of water could be potable by the system during a sunny day
with the 46% thermal efficiency. The system prototype constructed at JiT mechanical laboratory
and tested at normal weather condition.
