Heat transfer enhancement in a parallel, finless heat exchanger using a longitudinal vortex generator, Part A: Numerical investigation. (January 2019)

• Record Type: Journal Article
• Authors: Li, Jiyang; Dang, Chaobin; Hihara, Eiji
• Is Part Of: International journal of heat and mass transfer. Volume 128(2019)
• Page Start: 87
• Page End: 97
• Publication Date: 2019-01
• Subjects: Finless parallel heat exchanger -- Longitudinal vortex generator -- Numerical simulation; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.06.049
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: A finless heat exchanger with excellent drainage performance is proposed. The performance of finless heat exchanger can be enhanced by a vortex generator. A novel, double-triangular shape was developed for the LVG using a numerical method. Abstract: A design for a parallel, finless, flat-tube heat exchanger is proposed and assessed for high performance in air conditioners. In this design, a longitudinal vortex generator (LVG) plate consisting of thousands of LVGs is placed in front of the finless heat exchanger in the airflow path, thus resulting in improved heat transfer. The LVG was installed in front of the finless heat exchanger with a gap of about 1 mm, which ensured that under wet and frost/defrost conditions, the condensed or defrosted water would not drip onto the LVG. Therefore, the drain and defrosting performance was not affected by the LVG. A novel, double-triangular shape was developed for the LVG using a numerical method, and some parameters which significantly affect the performance of LVG were numerically analyzed.