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By calculating the latent heat we can calculate heat if there is a phase change
Generally wall thickness may be used to reduce the heat transfer but some time its use to increase the heat transfer, its mainly depends upon nature of the wall and coefficient of heat transfer.
some time no heat transfer occur such as, when ice melt into liquid at zero degree Celsius. but other case we can find heat load by many application or theory such as conduction, radiation and convection rule