## 4 Results and Discussion
### Influence of seawater Flow Rate and Temperature  
The effects of seawater on the ice making performance and performance characteristics of the slurry type seawater ice-making device were investigated when the seawater flow rate varied from 0.75 LPM to 1.25 LPM by 0.25 LPM depending on the nominal conditions. Depending on the inlet temperature and flow rate of the seawater, the ice cannot be de-iced or the flow rate is low and the device cannot be operated stably due to the adherence of ice in the tube and it was excluded in the graph. Figure 5 shows the effect of the seawater flow rate and inlet temperature on the temperature of the ice slurry. The temperature of the ice slurry changed from \(-\)2.07 \({}^{\circ}\)C to \(-\)1.76 \({}^{\circ}\)C depending on the inlet temperature and flow rate of seawater. The outlet temperature of the ice slurry decreases with respect to the inlet temperature of the seawater entering the evaporator. As the flow rate decreases, the outlet temperature of the ice slurry decreases. This is thought to be because the heat capacity of the seawater in the evaporator is reduced and the amount of heat required for ice-making is also reduced, resulting in higher IPF and an increase in the salinity of the outlet. When the inlet flow rate of the ice generator is lowered to 0.8 LPM, the temperature of the water at the inlet of the ice generator does not significantly affect the temperature of the slurry ice. Therefore, if the inlet temperature of the seawater is high, it is possible to reduce the inlet flow rate for lower the slurry ice temperature. If the ice generator inlet temperature is high, there is an area where icing cannot be done above a certain flow rate. Therefore, it can be seen that appropriate flow control is required according to the inlet temperature of the seawater. When the inlet temperature of the seawater is below 10 \({}^{\circ}\)C, it is possible to make ice in the whole flow range. It can be confirmed that it is necessary to pre-cool the inlet temperature of the sea water to 10 \({}^{\circ}\)C or lower for stable deicing regardless of the flow rate. \begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **Uncertainty * [\%]** \\ \hline Suction pressure [barg\({}_{\text{g}}\)] & \(\pm\)1.002 \\ Discharge pressure [barg\({}_{\text{g}}\)] & \(\pm\)1.001 \\ Temperature of ice slurry [\({}^{\circ}\)C] & \(\pm\)1.399 \\ Mass flow rate of refrigerant [kg/min] & \(\pm\)1.008 \\ IPF [\%] & \(\pm\)4.817 \\ Cooling capacity [kw] & \(\pm\)3.546 \\ \hline \hline \end{tabular}  
* Confidence level:95% (k = 1.96).  
\end{table} 
Table 4: Parameters and estimated uncertainties. Figure 5: Influence of seawater flow rate on temperature of ice slurry for inlet temperature of seawater. Figure 6 shows the IPF according to the flow rate and inlet temperature of seawater. The IPF calculated from the temperature of the ice slurry at the outlet of the evaporator shows a larger value as the inlet temperature of the seawater and the flow rate is lower. When the inlet temperature of seawater is 10 \({}^{\circ}\)C, the seawater flow rate decreased from 14.7% to 0.3% as the seawater flow increased from 0.75 LPM to 0.25 LPM. Also, it can be seen that the higher the inlet temperature, the greater the decrease in IPF with increasing flow rate. It is considered that the IPF is decreased at high temperature and high flow rate, because the amount of heat needed for cooling to the temperature required for ice making increases, due to the high temperature of seawater and the large amount of flow. Figure 7 shows the cooling capacity in the evaporator depending on the inlet temperature and flow rate of seawater. It can be seen that the cooling capacity in the evaporator tends to increase as the heat exchange rate in the evaporator increases. This occurs as the temperature difference between the evaporation temperature and the seawater increases with the rise of the inlet temperature of the seawater.