transferred between the inlet to the outlet through walls of the pipe. Thus a bayonet type receiver has nearly same heat transfer characteristics as a U-type receiver. Moreover a bayonet type receiver has a more reasonable configuration for avoiding fracture by thermal stress than a straight type receiver because the pipes are held at one end only. The authors select a bayonet type receiver for examinations. The present paper describes experimental and analytical investigation on the bayonet type receiver using the above mentioned composites. Model storage units for the experiments The following two kinds of composite thermal storage materials were loaded into the model storage units for heat transfer experiments in this study. (1) SiC/LiF : a composite of honeycombed matrix of SiC, which has 70% porosity, impregnated with lithium fluoride. (2) C/LiF : a composite of spongy matrix of porous carbon, which has 93% porosity, impregnated with lithium fluoride. Commercial grade lithium fluoride of 99.0% purity was made by Soekawa Chemically Co., Ltd. The honeycombed matrices of the SiC (b-SiC) were supplied by Ibiden Co., Ltd. The spongy matrices of the porous carbon were supplied by Mitsubishi Pencil Co. Ltd. These composite materials are shown in Figure 1.
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