Crude oil at 198°C is to be cooled to 39°C. The oil flow-rate is 6.032 kg/s. Cooling water is available at 29°C and at the rate of 27.032 kg/s. The pressure drop allowance for each stream is 100 kN/m?. Design a suitable shell and tube heat exchanger for this duty. The following are the properties of the two streams at the average temperature: Water Crude Oil Density kg/m3 Viscosity mNm²s Thermal Conductivity 990 850 680 x 10-3 0.18 0.630 0.130 W/m K Specific Heat kJ/ kg °K 4.2 2.3 Data: Assume overall heat transfer coefficient of 5032 W/m? K. Tubes: 20 mm 9 d., 16 mm id, tubes, 4 m long, triangular pitch 1.25do, carbon steel. Pull through head, Floating Head type heat exchanger. Baffle = 1/5 of the shell diameter and 25 % cut baffles Fouling factors 0.0003 m2 K/ W for cooling water and Q.0002m? K/ W for crude oil Thermal conductivity of metal = 52 W/m K

Water must be heated from 15 to 50°C in a simple double-pipe heat exchanger at a rate of 3,500 kg/h. The water is flowing inside the inner tube with steam condensing at 110°C on the outside. The tube wall is so thin that the wall resistance may be neglected. Assume that the steam-film coefficient h_0 is 11 kW/m^2 °C. What is the length of the shortest heat exchanger that will heat the water to the desired temperature, considering an optimal diameter for the tube? Checking several table values, the following properties of water for this scenario are: p = 993 kg/m^3 k = 0.61 W/m °C \mu (viscosity) = 0.78 cP Cp = 4.19 J/g °C

A shell and tube heat exchanger is designed as a counter flow type. Water (cp = 4182 J/kg.oC) enters the shell side at 30 oC with a mass flow rate of 12.5 kg/s. A mass flow rate of 19.5 kg/s of engine oil (cp = 1060 J/kg.o C), enters the tube side at 300 oC. Each tube is having an inner diameter of 36 mm and a wall thickness of 2 mm, and a length of 3 m. If the heat exchanger effectiveness is 60 %, calculate the following:1. The heat transfer rate,2. The exit temperature for each fluid,