# Simulation-Based Analysis of the Effect of New Immersion Freezing Equipment on the Freezing Speed
## 3 Results and Discussion
### Effect of Refrigerant Flow Rate on Freezing Time and Freezing Effect of Pork
[PERSON] and [PERSON] [21] took the change of grass carp in the process of forced convection impregnation and freezing as the research object, and studied the experimental research on the freezing speed and freezing quality of grass carp under the conditions of different flow rates of \(-20\)\({}^{\circ}\)C and \(-30\)\({}^{\circ}\)C. The experimental results are shown in Table 6. The experimental results are consistent with the numerical simulation results in this paper. With the increase of the flow rate of the refrigerant, the freezing rate increases. Figure 5: Temperature field program and \(x\)-\(y\) section temperature program under different flow rates of refrigerant. Figure 6: Fork center temperature curve with time. As can be seen from Figure 7, with the increase in the flow rate of the refrigerant carrier, the freezing time gradually decreases. When the flow rate of refrigerant carrier increases from v = 1 m/s to v = 2 m/s, the freezing time decreases from 5140 s to 4650 s (a difference of 490 s), and the freezing efficiency increases by 9.5%. When the flow rate of refrigerant carrier increases from v = 2 m/s to v = 3 m/s, the freezing time decreases from 4650 s to 4400 s (a difference of 250 s), and the freezing efficiency increases by 5.4%. When the flow rate of the refrigerant carrier increases from v = 2 m/s to v = 3 m/s, the freezing time decreases from 4400 s to 4300 s (a reduction of 100 s), and the freezing efficiency increases by 2.3%. When the flow rate of the refrigerant carrier increases from v = 4 m/s to v = 5 m/s, the freezing time decreases from 4300 s to 4200 s (reduced by 100 s), and the freezing efficiency increases by 2.3%. A comparison with existing studies shows that the freezing rate of the immersion frozen samples was higher than that of the air frozen treated samples. Similar results were previously observed in the freezing of strawberries [4]. The freezing process is prone to turbulence phenomena in the liquid medium. This then accelerates the formation of ice nuclei and increases the efficiency of heat transfer. These findings are consistent with the experimental results of [PERSON] on pork [22]. By comparing the temperature program data, it can be seen that increasing the refrigerant flow rate does not affect the freezing effect of pork, that is to say, increasing the flow rate will not change the phenomenon of uneven freezing. From the curve and histogram data, it can be seen that increasing the flow rate of the refrigerant carrier will have an impact on the freezing speed of pork. With the increase of the flow rate of the refrigerant carrier, the freezing time of pork will gradually decrease. However, it can be seen from Figure 8. The improvement of refrigeration efficiency shows a decreasing trend, which means that with \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Freezing Temperature (\(-\)20 \({}^{\circ}\)C)** & \multicolumn{3}{c}{**Freezing Temperature (\(-\)30 \({}^{\circ}\)C)**} \\ \hline
**Current Speed** & **Freezing Rate** & **Current Speed** & **Freezing Rate** \\
**(L/min)** & **(cm/h)** & **(L/min)** & **(cm/h)** \\ \hline
14.9 & 4.55 & 12.9 & 10.57 \\
11.2 & 3.37 & 9.9 & 9.04 \\
8.64 & 3.06 & 6.6 & 8.05 \\
5.88 & 2.80 & 4.02 & 7.24 \\
3.18 & 2.14 & 1.02 & 6.48 \\
0 & 1.70 & 0 & 5.68 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Flow rate and freezing rate of refrigerant carrier. Reprinted with permission from Ref. [21]. 2012, [PERSON]; [PERSON] More details on “Copyright and Licensing” are available via the following link: cnki.net. Figure 7: Bar chart of refrigerant flow rate and freezing time. the increase of refrigerant flow rate, the improvement of refrigeration efficiency gradually decreases and finally tends to a fixed value.