Bottoms Cooler

Several sets of temperature measurements were taken during the operation of the pilot plant to assess the performance of the bottoms cooler. The inlet and outlet chilled water temperatures are not measured on-line but a surface temperature probe was used to provide this data for various process conditions. Similarly, the chilled water flow to the bottoms cooler would not normally be manipulated during the operation of the pilot plant but two flow rates were examined for the purpose of evaluating the heat transfer rates. The data is shown in Table 12.4 and compared with the predicted heat transfer coefficients (HTCs) in Figure 12.2. The excellent agreement between the measured and predicted values confirms the appropriateness of the design method and suggests that the bottoms cooler can provide adequate cooling at the expected operating conditions.

Table 12.4 - Heat Transfer Data for the Bottoms Cooler

Inner Pipe

Outer Pipe

Inlet

Outlet

Inlet

Outlet

Flow

Temp.

Temp.

Flow

Temp.

Temp.

LMTD

Duty

HTC

(L/min)

(°C)

(°C)

(L/min)

(°C)

(°C)

(°C)

(kW)

(W/°C/m2)

0.27

106.9

35.3

20

9.7

10.0

53

0.60

376

0.30

102.0

35.1

20

9.7

10.0

52

0.62

404

0.23

98.6

35.6

10

9.6

10.2

51

0.45

297

0.22

92.3

34.1

10

9.5

10.1

48

0.40

281

0 100 200 300 400 500

Predicted HTC (W/m2/C)

Figure 12.2 - Measured and Predicted Heat Transfer Coefficients for the Bottoms Coole

0 100 200 300 400 500

Predicted HTC (W/m2/C)

Figure 12.2 - Measured and Predicted Heat Transfer Coefficients for the Bottoms Coole r

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