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In design mode the diameter of the of the holding tube (in m) is calculated by: According to the literature, regeneration efficiencies of up to 94-95 % can be achieved in efficient modern pasteurization plants. This is a necessary modification required by the fact that the same liquid, at the same flowrate, is heated and cooled in the regenerator so the logarithmic mean temperature difference is “forced” to infinity.Įxpresses the percentage of the temperature increase that is achieved by the regenerator w.r.t the overall required temperature increase (i.e., in order to reach the desired pasteurization temperaure). Notice that while a logarithmic mean temperature difference is employed for the heater and the cooler, an arithmetic mean is employed in the case of the regenerator. T HA,in, T HA,out and T CA,in, T CA,out denote the inlet and outlet temperatures of the heating and cooling agent streams, respectively (K).T C,out is the temperature of the stream leaving the cooler (final exit temperature) (K).
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T C,in is the temperature of the stream entering the cooler (regenerator hot stream exit temperature) (K).T H,out is the temperature of the stream leaving the heater (pasteurization temperature) (K).T H,in is the temperature of the stream entering the heater (regenerator cold stream exit temperature) (K).T F temperature of the pasteurizer’s feed stream (K).ΔΤ M,x is a mean temperature difference (K), calculated by.Ux is the overall heat transfer coefficient (W m -2 K -1).Q x denotes the thermal load of the heat exchanger (J/s).x stands for the heater, cooler or regenerator.The heat transfer area, A x, is calculated by the following equation In design mode, the model calculates the individual heat transfer areas of the pasteurizer’s heater, cooler and regenerator sections assuming countercurrent flow conditions for all heat exhangers. Pasteurization Procedure Pasteurization: Modeling Calculations Heat Transfer Area Calculation.