Development of a black galingale dryer using biomass working together with a CLOHP/ CV heat exchanger

บทคัดย่อ

Abstract

This research was designed to test a black galingale dryer working together with a CLOHP/CV heat exchanger. The dimensions of the drying chamber were 0.6´1.0´1.0 m. The heat exchanger in this study was a closed-loop oscillating heat pipe with check valves (CLOHP/CV) using ethanol and water as the working fluids with a filling ratio of 50% (by total volume of tube). The CLOHP/CV was made of a copper tube with an inner diameter of 2.03 mm. The evaporator,adiabatic and condenser lengths were equal to 200, 100 and 200 mm. The number of turns was 50. The experimental results showed that the moisture content of the black galingale decreased from 143 % (wb) to 2.88% (wb). In addition,the type of working fluid affected the drying time. It was found that the fuel quantity, drying time, heat transfer rate and effectiveness of using ethanol and water as the working fluids were (13.5 kg and 25 kg), (6.30 hr and 10.30 hr),(1851.93 watt and 1078.71 watt) and (0.48 and 0.31) respectively, In conclusion, development of a black galingale dryer using by biomass working together with a heat exchanger was found to be technically suitable for drying black galingale and could reduce energy costs.

Keywords: Closed-loop oscillating heat pipe (CLOHP), check valve (CV), heat exchanger, drying, biomass.