为了应对即将到来的全球对氟氯化碳和氟氯烃化合物的禁令，氨是一种强有力的制冷剂替代品。对于强化管中的氨或混油中的氨，热交换器设计师没有可用的传热和流体流动数据。蒸发器的建模和设计需要对本研究产生的数据进行关联。本课题的目的是研究氨管内蒸发过程中的基本局部两相传热和压降。将对光滑管和强化表面微翅片管的蒸发性能进行量化。该研究还将研究可混溶润滑剂对蒸发性能的影响。 除了实验研究之外，还将建立相关关系，以帮助设计蒸发器。主要研究人员:唐·芬顿主持:1995年4月至1999年10月赞助:TC 1.3，传热与流体流动

Ammonia is a strong candidate for use as a refrigerant in response to the impending global ban on CFC, and HCFC compounds. There are no heat transfer and fluid flow data available to heat exchanger designers for ammonia in enhanced tubes, or for ammonia with miscible oil. Correlations of the data generated by this research are needed in evaporator modeling and design. The objective of this research project is to investigate basic local two-phase heat transfer and pressure drop during in-tube evaporation of ammonia. The evaporation performance will be quantified for a smooth tube and an enhanced surface micro-fin tube. The study will also investigate the effect miscible lubricants have on evaporation performance. In addition to the experimental study, correlation will be developed that aid in designing evaporators.Principal Investigator: Don FentonConducted: April 1995 - October 1999Sponsored by: TC 1.3, Heat Transfer and Fluid Flow