The plate heat exchanger (PHX) has been widely used as a heat exchanger in fresh water generators (FWGs) at low mass flux conditions. In this study, the flow boiling heat transfer and pressure drop characteristics of water in a PHX for the FWG were measured by varying mass flux from 14.5 to 33.6 kg m -2 s-1, heat flux from 15.0 to 30.0 kW m-2, and mean vapor quality from 0.09 to 0.6 in the pressure range of 112-121 kPa. The flow boiling heat transfer of water in the PHX was in the convective boiling region. The flow boiling heat transfer coefficient decreased with increasing mean vapor quality and decreasing mass flux. However, the effect of the heat flux on the flow boiling heat transfer coefficient was almost negligible. In addition, the two-phase frictional pressure drop increased with increasing mean vapor quality and mass flux, but it remained nearly constant according to the heat flux. Two-phase heat transfer and pressure drop correlations for water in PHXs were developed based on the measured data. The proposed heat transfer and pressure drop correlations showed mean absolute deviations of 4.4% and 10.4%, respectively, compared with the measured data.
|Number of pages
|International Journal of Heat and Mass Transfer
|Published - 2014 Oct
Bibliographical noteFunding Information:
This work was supported by the Human Resources Development program (No. 20124010203250) and the Energy & Technology Development program (No. 2012T100100356) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy.
- Flow boiling heat transfer coefficient
- Fresh water generator
- Low mass flux
- Plate heat exchanger
- Two-phase frictional pressure drop
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes