Supertargeting - TOTAL AREA AND NUMBER OF UNITS TARGETING...

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TOTAL AREA AND NUMBER OF UNITS TARGETING
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TOTAL AREA TARGETING In this part we will explore ways to predict the total area of a network without the need to explore specific designs. Because A=Q/(U* T ml ), one can calculate the area easily in the following situation. T Q T ml = T H1 T H2 T C1 T C2 (T H1 -T C2 )-(T H2 -T C1 ) (T H1 -T C2 ) (T H2 -T C1 ) ln H
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TOTAL AREA TARGETING Since area=Q/(U T ml ), the composite curve diagram provides one way of estimating the total area involved. Isolate all regions with a pair of straight line sections and calculate the area for each. Cooling water Heating utility, steam or furnace. A 1 A 4 A 5 A 6 A 3 A 2 The above scheme of heat transfer is called VERTICAL HEAT TRANSFER H T
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EXERCISE Calculate the values of Q in each interval and estimate the corresponding area. Use U = 0.001 MW m -2 o C Furnace (300 o C) Obtain the total area estimate Cooling Water 230 180 140 20 250 200 80 40 T= T min Pinch Q 1 Q 2 Q 6 Q 3 Q 4 Q 5 H T
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