Abstract:
This report studied a feasibility of technical and economic aspects of storage energy system, using
the parabolic type solar drying with phase change thermal energy storage system. The study carried
out of designing and constructing of prototype dryer, include performance testing with considerable
of various influence parameter. The design or phase change thermal energy storage system consists
of 3 main parts; 1) 1.54 square meter plot plate type solar collector unit, 2) drying chamber size
0.336 square meter and 3) phase change thermal energy storage unit which could be adjustable the
decline angle of the storage tank. The phase change thermal energy storage system is designed with
PVC storage tank in dimension of 0.5 meter diameter and 1.4 meter length, includes with an
insulation installer cover the tank. Inside the tank is consists with 1.4 meter length, 9.5 millimeter
diameter of 66 copper tubes. To enhance a heat transfer efficiency each copper tube was welded
with 30 millimeter of disk-fin, 61 fin per tube. Paraffin is uses to be a thermal energy absorber
substance and water uses as a heat exchanging media substance of the system. The study result
shows the average of overall heat transfer coefficient (VA) of the phase change thermal energy
storage system, during energy charging into paraffin is 0.7751 kilowatt per centigrade degree, and
during heat transfer to water is 1.3814 kilowatt per centigrade degree. Furthermore the result
indicated that the period of energy charging in to paraffin and period of heat transfer to water at 6
and 14 hour respectively, have given the maximum efficiency of the system at condition of water
flow rate 15 liter per minute and 0 degree (horizontal) of the storage tank. This result due to under
that condition, the system was able to transfer and uses of phase-latent heat from paraffin for 260
minutes long. Economical analysis shows break-even point of this drying system in payback period
of3.2 year.