Milk pasteurization process proposed by Jubaedah et al. [2]

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... previous study [2], transient response simulation using SCILAB's XCOS has been conducted to simulate transient response of pasteurization process in a shell and tube heat exchanger under geothermal brine temperature disturbance only. The pasteurization process, operating condition, and heat exchanger parameter was based on HTST pasteurization process proposed by Jubaedah et al. [3] to be applied in milk factory at Pangalengan, Indonesia (Figure 1). This process does not directly utilize the geothermal brine as the heating fluid in pasteurizer, but rather use secondary water to be heat up by the geothermal brine and then in turn, used as the heating fluid in pasteurization process. ...

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... results of this simulation is shown in Figure 10 and Figure 11. Figure 10 shows how the milk outlet temperature reacts to both disturbance. At t = 5s, the disturbance occurred. ...

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... results of this simulation is shown in Figure 10 and Figure 11. Figure 10 shows how the milk outlet temperature reacts to both disturbance. ...

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... results of this simulation is shown in Figure 10 and Figure 11. Figure 10 shows how the milk outlet temperature reacts to both disturbance. At t = 5s, the disturbance occurred. ...

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... milk outlet temperature also dropped to 71.5 o C after the disturbance. Since this drop of temperature triggers a nonzero value of error, the PID reacts by reducing the milk inlet flow rate as can be seen in Figure 11. The PID controller response is somewhat fluctuate since the PID controller tries to suppress the error value back to zero as soon as possible. ...

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... t = 150s (145 seconds after disturbance), the milk outlet temperature reach a constant value of 72 o C. Also, the PID controller manage to maintain the milk outlet temperature inside the +0.5 o C acceptable temperature range. Figure 11. Simulation result of controlled milk inlet flow rate ...