인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
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오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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