This paper is continued from the last one in which the freezing characteristics of the spherical ice storage capsule were investigated. Melting processes of the ice inside the spherical capsule cut half were visualized and melting rates of the ice inside the spherical capsule were measured by using the same experimental apparatus used in the last paper. Experimental results were investigated and the coefficient of heat transmission K_w for the melted water based on the ice surface was defined under the assumption of the ice melting spherically. K_w obtained from melting rates measured was related to the melting conditions. A melting model to calculate K_w was proposed and its calculating method was shown. K_w calculated from this method was compared with that measured. Comparatively good agreements were obtained between measured and calculated results. It is possible to estimate the change of heat transfer characteristics of the spherical ice storage capsule caused by the melting conditions easily by using this calculation method.