| The effect of using the heat storage system and the return flow system on the thermal performance of a solar dryer |
| Paper ID : 1014-NICAME1402 |
| Authors: |
|
Mohadeseh Ahmadi *1, Hadi Samimi Akhijahani2, Payman Salami2 1Biosystem Mechanical Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Kurdistan, Iran 2Department of Biosystem Mechanics Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Kurdistan, Iran |
| Abstract: |
| The flat solar collector is one of the important components of solar energy absorption systems such as solar dryers. These collectors are more interested in drying agricultural products due to their easy design and construction and the availability of components. But their efficiency is very low compared to other collectors. Therefore, the use of new technologies such as heat pump, phase change materials, return flow system, reflectors seems necessary to improve the efficiency of these collectors. In this research, the phase change material in the form of 17 cm tubes has been used inside the flat plate solar collector. These pipes are placed in five rows of five at intervals of 5, 10 and 15 centimeters on the rows. Three air velocities, 0.5, 1, and 2 m/s were considered to evaluate the thermal performance and Sanjad product was used to evaluate the drying performance. The effect of air speed on drying was greater than the location of the phase changer. By examining the thermal efficiency of the solar collector, the result was obtained that the best thermal efficiency occurs at an air speed of 2 m/s and a distance of 15 cm at the rate of 29.56%. The thermal efficiency of the collector increased in the last hours of the day due to the release of thermal energy. Meanwhile, the highest drying efficiency of 36.72% was obtained. |
| Keywords: |
| Flat plate collector, thermal efficiency, return flow system, phase change material. |
| Status : Paper Accepted (Poster Presentation) |
