Heat-transfer characteristics of latent thermal-storage units with sodium hydroxide-based molten salts

Katsuhiko Kanari; Yoshiyuki Abe; Kotaro Tanaka; Yoshio Takahashi; Ryuji Sakamoto; Masayuki Kamimoto; Takeo Ozawa

Heat-transfer characteristics of latent thermal-storage units with sodium hydroxide-based molten salts

Katsuhiko Kanari, Yoshiyuki Abe, Kotaro Tanaka, Yoshio Takahashi, Ryuji Sakamoto, Masayuki Kamimoto, Takeo Ozawa

Research output: Contribution to journal › Article

Abstract

The present paper describes experimental and computer simulation results for 30 kWh scale horizontal U-tube type latent thermal-energy storage units using a eutectic of sodium hydroxide-sodium nitrate as a phase change material. Through 1000 melting/freezing (charge/discharge) cycle tests on two storage units of bare-tube and finned-tube types, the heat-transfer characteristics were evaluated. Computer simulations on both the storage units were performed with a two-dimensional model. In the case of the finned-tube type, the effect of fins was included in the effective thermal conductivity of molten salt around the tubes. The calculated results were in good agreement with the observed ones. The model was also applied to practical-scale storage units, and the influence of the parameters, such as the ratio of the diameter to the length of the storage vessel, the number of heat-transfer pipes and channel partitions, etc., on the heat-transfer performance was evaluated.

Original language	English
Pages (from-to)	686-699
Number of pages	14
Journal	Heat Transfer - Japanese Research
Volume	20
Issue number	7
Publication status	Published - 1991 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

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title = "Heat-transfer characteristics of latent thermal-storage units with sodium hydroxide-based molten salts",

abstract = "The present paper describes experimental and computer simulation results for 30 kWh scale horizontal U-tube type latent thermal-energy storage units using a eutectic of sodium hydroxide-sodium nitrate as a phase change material. Through 1000 melting/freezing (charge/discharge) cycle tests on two storage units of bare-tube and finned-tube types, the heat-transfer characteristics were evaluated. Computer simulations on both the storage units were performed with a two-dimensional model. In the case of the finned-tube type, the effect of fins was included in the effective thermal conductivity of molten salt around the tubes. The calculated results were in good agreement with the observed ones. The model was also applied to practical-scale storage units, and the influence of the parameters, such as the ratio of the diameter to the length of the storage vessel, the number of heat-transfer pipes and channel partitions, etc., on the heat-transfer performance was evaluated.",

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AU - Kanari, Katsuhiko

AU - Abe, Yoshiyuki

AU - Tanaka, Kotaro

AU - Takahashi, Yoshio

AU - Sakamoto, Ryuji

AU - Kamimoto, Masayuki

AU - Ozawa, Takeo

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N2 - The present paper describes experimental and computer simulation results for 30 kWh scale horizontal U-tube type latent thermal-energy storage units using a eutectic of sodium hydroxide-sodium nitrate as a phase change material. Through 1000 melting/freezing (charge/discharge) cycle tests on two storage units of bare-tube and finned-tube types, the heat-transfer characteristics were evaluated. Computer simulations on both the storage units were performed with a two-dimensional model. In the case of the finned-tube type, the effect of fins was included in the effective thermal conductivity of molten salt around the tubes. The calculated results were in good agreement with the observed ones. The model was also applied to practical-scale storage units, and the influence of the parameters, such as the ratio of the diameter to the length of the storage vessel, the number of heat-transfer pipes and channel partitions, etc., on the heat-transfer performance was evaluated.

AB - The present paper describes experimental and computer simulation results for 30 kWh scale horizontal U-tube type latent thermal-energy storage units using a eutectic of sodium hydroxide-sodium nitrate as a phase change material. Through 1000 melting/freezing (charge/discharge) cycle tests on two storage units of bare-tube and finned-tube types, the heat-transfer characteristics were evaluated. Computer simulations on both the storage units were performed with a two-dimensional model. In the case of the finned-tube type, the effect of fins was included in the effective thermal conductivity of molten salt around the tubes. The calculated results were in good agreement with the observed ones. The model was also applied to practical-scale storage units, and the influence of the parameters, such as the ratio of the diameter to the length of the storage vessel, the number of heat-transfer pipes and channel partitions, etc., on the heat-transfer performance was evaluated.

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