0.35 kg/s of ethyl benzene is to be cooled from 90°c to 55°c in the annulus of a double pipe heat exchanger. the two steel pipes are 1 ¼ in and 2 in nominal size. a cooling stream of water, in the inner tube, is available at a temperature of 27°c. calculate the mass flowrate of water required if the outlet temperature of water is 45°c, the lmtd, the overall heat transfer coefficient based on outside surface, and the total surface area of the exchanger. if the effective exchanger length is not to exceed 8 ft, calculate the number of tubes required. also, do the calculations for both cocurrent flow and countercurrent flow. use reliable literature source for the physical properties.

one state would change   like louisiana to texas. thats a change

explanation:

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

idk what is it? is this a question that you know the answer or u dont

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.