where q (m,n,p) comprises the heat fluxes across all six sides of the vial. While heat transfer in a cold storage room may be complex in practice, we use a 2-parameter approach to provide a qualitatively accurate description. We define an internal heat transfer coefficient k int , which describes the heat transfer among neighboring vials, and an external heat transfer coefficient k ext , which describe the heat transfer of vial surfaces facing the exterior of the system with the environment. A quantitative estimation of values for these parameters is challenging due to the different mechanisms of heat transfer involved in freezing. In this work, we therefore focus on a sensitivity analysis and investigate how the freezing process behaves under various heat transfer conditions. These considerations lead to the following expressions for the heat fluxes: