A small size cooling tower is designed to cool 6 litres of water per second, the inlet temperature of which is 50 °C. The motor driven fan induces 10 m3/s of air through the tower and the power absorbed is 5.15 kW. The air entering the tower is at 18 °C, and has a relative humidity of 60 %. The air leaving the tower can be assumed to be saturated and its temperature is 26 °C. Assume that pressure remains constant throughout the tower at 1.013 bar. Calculate: a) The amount of cooling water (make-up) required per second
b) The final temperature of the water

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented