Heat-transfer area and use of log mean temperature difference. a reaction mixture having a cpm = 2.85 kj/kg · k is flowing at a rate of 7260 kg/h and is to be cooled from 377.6 k to 344.3 k. cooling water at 288.8 k is available and the flow rate is 4536 kg/h. the overall uo is 653 w/m2 · k. for counterflow, calculate the outlet water temperature and the area ao of the exchanger. repeat for cocurrent flow.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?