Simulation of a fish freezing tunnel using Modelica.

The problem of energy consumption during freezing of pelagic fish in an air blast freezing tunnel was investigated. Measurements from a freezing plant were compared with the results from a simulation model, and the results of the comparison show that the required freezing time can be reasonably well predicted. The simulation results show that the freezing time is strongly depending on the type of product and fat content of the fish that is being frozen. Fish filets with 20% fat content require 11% shorter freezing time than fish filets with 7% fat content, and round fish require 16% shorter freezing time than fish filets. Energy can be saved by taking this into account when operating the freezing tunnels.

本研究针对鼓风冻结隧道（air blast freezing tunnel）内远洋鱼类（pelagic fish）冻结过程中的能耗问题展开了调研。本研究将某冷冻加工厂的实测数据与模拟模型的计算结果进行对比，对比结果表明该模型可较为准确地预测所需冻结时长。模拟结果显示，冻结时长显著取决于待冻结鱼类的产品类型与脂肪含量：脂肪含量20%的鱼柳（fish filets），其冻结时长较脂肪含量7%的鱼柳短11%；整鱼（round fish）的冻结时长则较鱼柳短16%。在鼓风冻结隧道的运行过程中充分考虑上述影响因素，可有效实现能耗节约。