APPENDIX Capillary geometry for maximum heat transfer The capillary geometry for maximum heat transfer through the inner wall of a PCM heat storage container of the type shown in Fig. 2 was determined as summarized below. In a dimensionless form, the heat transfer through the inner wall may be expressed as a simple function of the dimensionless capillary height z (= capillary height / difference between inner radius of outer container wall and outer radius of inner container wall at bottom of capillaries (Fie. 2)) and the dimensionless volume change upon melting of the
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