Research Papers: Two-Phase Flow and Heat Transfer

Experimental Study on Thermal Characteristics of Finned Coil LHSU Using Paraffin as Phase Change Material

[+] Author and Article Information
Guansheng Chen

School of Materials and Energy,
Guangdong University of Technology,
Guangzhou Higher Education Mega-Center,
Guangzhou 510006, China
e-mail: chengs@gdut.edu.cn

Nanshuo Li, Huanhuan Xiang, Fan Li

School of Materials and Energy,
Guangdong University of Technology,
Guangzhou Higher Education Mega-Center,
Guangzhou 510006, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 2, 2016; final manuscript received November 14, 2016; published online January 10, 2017. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 139(4), 042901 (Jan 10, 2017) (7 pages) Paper No: HT-16-1242; doi: 10.1115/1.4035321 History: Received May 02, 2016; Revised November 14, 2016

It is well known that attaching fins on the tubes surfaces can enhance the heat transfer into and out from the phase change materials (PCMs). This paper presents the results of an experimental study on the thermal characteristics of finned coil latent heat storage unit (LHSU) using paraffin as the phase change material (PCM). The paraffin LHSU is a rectangular cube consists of continuous horizontal multibended tubes attached vertical fins at the pitches of 2.5, 5.0, and 7.5 mm that creates the heat transfer surface. The shell side along with the space around the tubes and fins is filled with the material RT54 allocated to store energy of water, which flows inside the tubes as heat transfer fluid (HTF). The measurement is carried out under four different water flow rates: 1.01, 1.30, 1.50, and 1.70 L/min in the charging and discharging process, respectively. The temperature of paraffin and water, charging and discharging wattage, and heat transfer coefficient are plotted in relation to the working time and water flow rate.

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Grahic Jump Location
Fig. 1

Finned coils for test

Grahic Jump Location
Fig. 3

Charging and discharging process of the finned coil LHSU with Fp = 2.5 mm under the flow rate of 1.01 L/min: (a) Tc, (b) Qc and Kc, (c) Td, and (d) Qd and Kd

Grahic Jump Location
Fig. 4

Charging and discharging process of the finned coil LHSU with Fp = 5.0 mm under the flow rate of 1.50 L/min: (a) Tc, (b) Qc and Kc, (c) Td, and (d) Qd and Kd

Grahic Jump Location
Fig. 5

Effects of fin pitch and flow rate on the thermal characteristics of the finned coil LHSUs in the charging and discharging process: (a) Kcm, (b) Kdm, (c) Qcm, and (d) Qdm



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