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Design an air cooler to cool 30,000 kg/h of diesel oil from 120C to 50 C. The highest ambient temperature that is exceeded for

Design an air cooler to cool 30,000 kg/h of diesel oil from 120C to 50 C. The highest ambient temperature that is exceeded for 40 h/yr on average is 40 C. Physical properties of diesel oil over the temperature range of interest can be taken as: speci- fic heat capacity 2.1 kJ/kg. C, themal conductivity 0.135 W/mC, density 800 kg/m', viscosity 1.2 mN ms.

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