Extension to Planck's equation for predicting freezing times of foodstuffs of simple shapes

Planck's equation for predicting freezing times ignores sensible heat and the gradual character of the phase-change process in foodstuffs

Q.T Pham

2003

Scholarcy highlights

  • Planck's equation for predicting freezing times ignores sensible heat and the gradual character of the phase-change process in foodstuffs
  • By making certain analytical approximations to take these effects into account, a simple freezing-time prediction method is obtained that uses no empirical factor, chart or advanced algebra
  • The freezing process is divided into cooling and phase-change periods, the latter being calculated with Planck's equation, the former with extensions to Newton's law of cooling
  • The gradual character of the phase-change process is taken into account by the use of a ‘mean freezing temperature’, while the thermophysical properties of the material are approximated by straight-line segments
  • The method agrees with published data as well as or better than any previous procedure, including finite-difference computations

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