Charge and Discharge Characteristics of a Direct Contact Latent Thermal Energy Storage Unit Using Form-Stable High-Density Polyethylene

[+] Author and Article Information
Y. Abe, Y. Takahashi, R. Sakamoto, K. Kanari, M. Kamimoto, T. Ozawa

Electrotechnical Laboratory, 1-1-4 Umezono, Sakura-Mura, Ibaraki 305 Japan

J. Sol. Energy Eng 106(4), 465-474 (Nov 01, 1984) (10 pages) doi:10.1115/1.3267626 History: Received October 01, 1983; Online November 11, 2009


For solar thermal energy utilization in relatively low temperatures, a lab-scale direct contact, latent thermal energy storage unit using a form-stable high-density polyethylene (HDPE) was developed. The phase change material (PCM), the form-stable HDPE, does not fluidize nor adhere even after melting, and this particular property permits a direct contact heat transfer between the PCM and a heat transfer fluid (HTF). The storage column in the present study consists of a bundle of vertically arranged thin HDPE rods, where HTF flows in the axial direction and contacts with the HDPE surface directly. A series of experiments were performed for both charge and discharge modes under conditions of different flow rates, initial temperatures in the column, and HTF inlet temperatures. A numerical simulation was also made to study further detailed performance of the storage unit. The charge and discharge characteristics of the storage unit are discussed.

Copyright © 1984 by ASME
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