As natural refrigeration

propane will be alternative refrigerant in the future due to its good performance and its lack of impact on the environment. Currently

the study for flow boiling heat transfer of propane in helically coiled tube is few. This paper presents the experimental results of flow boiling heat transfer of propane in helically coiled tube. The internal diameter

helical diameter and helical pitch of helically coiled tube are 8 mm

42 mm

21.5 mm respectively and the outer tube is straight smooth tube. As warm fluid

water flows between outer tube and helically coiled tube. The heat flux can be adjusted by changing inlet temperature and flow meter of water. The heat transfer coefficients in experiment are compared to predictions from several boiling correlations both in straight tubes and helically coiled tubes in the literature. Comparison results show that helically coiled tubes have better heat transfer effect than straight tubes. The results also shows that when the heat flux is less than 6 kW·m-2

Guo's correlation shows higher accuracy than Ji's correlation. So Guo's correlation is recommended at low heat flux condition.