Ethylene glycol is heated from 25C to 40C at a rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m-K) with an inner diameter of 0.02 m and an outer diameter of 0.028 m. A saturated vapor (Tg = 110C) condenses on the outside-tube surface with the heat transfer coefficient (in kW/mK) given by 9.2/(Tg - Tw) 0.25, where Tw is the average outside-tube wall temperature. What tube length must be used? Assume the properties of ethylene glycol to be p = 1109 kg/m Cp=2428 J/kg-K k = 0.253 W/m-K u = 0.01545 kg/m-s Pr=148.5. Assume a wall temperature of 80 C. Ethylene glycol 2.5 kg/s 25C T = 110C L The length of the tube required is m.