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(한국에너지기술연구원) (고려대학교) (한국에너지기술연구원) (한국에너지기술연구원) (한국에너지기술연구원) (태양전기) (한국에너지기술연구원)
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대한설비공학회 설비공학논문집 설비공학논문집 제38권 제3호
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    초록·키워드

    This study examines the reduction of refrigerant charge for R1336mzz(Z) through heat transfer analysis in a falling film evaporator designed for industrial high-temperature heat pumps. A lab-scale test facility was established to evaluate two types of heat transfer tubes—bare tubes and E-tubes—under film Reynolds numbers ranging from 100 to 550 and heat fluxes between 5 and 25 kW/m². The results indicate that the falling film heat transfer coefficient for the bare tube increased with heat flux, demonstrating a strong dependence on surface nucleation boiling dynamics. In contrast, the E-tube showed nearly constant values regardless of heat flux, suggesting that the surface enhancement resulted in fully developed nucleation boiling. To further explore the potential for minimizing refrigerant charge, a hybrid evaporator configuration combining flooded and falling film operation was compared to a conventional flooded evaporator using E-tube conditions. The hybrid system achieved a 48% reduction in refrigerant charge per unit of evaporation capacity while maintaining comparable evaporation performance. These findings underscore the benefits of using falling film evaporators with advanced tube designs, which provide improved thermal performance and a significant reduction in the use of costly, low-GWP refrigerants like R1336mzz(Z). This work lays the groundwork for the practical design of high-temperature heat pumps aimed at industrial steam production.

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      UCI(KEPA) : I410-151-26-02-096358097