Application of closed-loop oscillating heat-pipe with check valves (CLOHP/CV) air-preheater for reduced relative-humidity in drying systems

P. Meena, S. Rittidech and N. Poomsa-ad

Applied Energy, 2007, vol. 84, issue 5, 553-564

Abstract: This paper aims to design, construct, and test the CLOHP/CV air-preheater for reduced relative humidity in drying systems for recovering the waste heat from the drying cycle. The CLOHP/CV heat-exchanger consisted of 3.58 m long copper tubes, with an internal diameter of 0.002 m. The evaporator and condenser sections were 0.19 m long, the adiabatic sections were 0.08 m long, the hot-air velocities were 0.5, 0.75 and 1 m/s with the hot-air temperatures being 50, 60 and 70 °C, and the relative humidity was 100%. The working fluid was R134a with the filling ratio of 50%. It can be concluded that, with an increase in the hot-air temperature from 50 to 70 °C, the heat-transfer rate slightly increases. The velocity increases from 0.5, 0.75 to 1 m/s and the heat-transfer rate slightly decreases. The velocity increases from 0.5, 0.75 to 1 m/s and the effectiveness slightly decreases. The hot-air temperature increases from 50 to 70 °C and the effectiveness slightly increases. The relative humidity reduced to the range 54-72% from 89% to 100%. The CLOHP/CV air-preheater can reduce the relative humidity and achieve energy thrift.

Keywords: Closed-loop; oscillating; heat-pipe; Check; valves; Air-preheater; Relative; humidity; Heat; recovery; Drying; system (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (9)

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