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A cross-flow type air heater has an area of 50 m2 . The overall transfer coefficient is 100 Wm2 K; and heat capacity of the stream, be it hot or cold, is 1000 W/K. What is the NTU? (a) 500 (b) 50 (c) 5 (d) 0.5 |
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Answer» (c) 5 NTU = \(\cfrac{UA}{C_{min}}\) U = 100 W/m2K C = 1000 W/K = Cmin A = 50 m2 NTU = \(\cfrac{UA}{C_{min}}\) = \(\cfrac{100\times50}{1000}\) = 5 |
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