An oil cooler witha mass flow rate 0.5 kg/s is used to cool lubricating oil from 140°C to 60°C in a counter-flow double pipe heat exchanger. The cooling water at 15°C and 0.3 kg/s enters the inner tube (k=50W/mK) having 29mm inner and 32mm outer diameter. If the oil side heat transfer coefficient based on the outer surface of the inner tube is 40 W/m?K and the cooling water has a specific heat of 4217 J/kgK, calculate: 1. Outlet temperature of the cooling water 2. Required tube length

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.