The non-traditional heat exchangers type effect on two phase heat transfer during evaporation process

Enhancement of heat transfer during the evaporation process investigated experimentally. Sub-cooled carbon dioxide flows inside nontraditional heat exchangers; micropipe heat exchanger with internal diameter of 0.6 mm and a porous tube one filled with gravel sand with porosity of 39.8 %. The experiments were carried out at different operating conditions. It is found that the heat transfer coefficient of the micropipe heat exchangers reached twice of the porous tube heat exchanger. Correlations utilized in the literature were used to validate experimental results. Good conformity was obtained.