Saturated liquid r-134a enters a heat exchanger at 200 kpa and 1.363 kg/s. the refrigerant cools liquid no. 2 diesel fuel (cp =2.1 kj/kg. k, p=760 kg/m^3) from 89°c to 8°c. the diesel flow rate is 175 liters per minute (1000 l 1 m3). determine: 1)- the rate of heat transfer, in kw 2)-the exit temperature of the refrigerant, in c

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?

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.

Calculate the resolved shear stress on the (111)[011] slip system of a unit cell in an fcc nickel single crystal if a stress of 13.7 mpa is applied in the [001] direction of a unit cell.