Interstage cooling is used to reduce the compression work required in a multistage compressor of a helium cooled nuclear reactor. in one such cooler, 2.5 kg/s of helium at 2.5 bar is cooled from 400 k to 310 k by 5 kg/s of cooling water at 300k. it is proposed to have a single pass of helium through a in, 18 gage cooper tubes at a velocity of 30 m/s, with the water in counterflow on the shell side. if the shell side heat transfer coefficient is 8000 w/m2k, determine the number of tubes required and the exchanger. also calculate the helium pressure drop

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit. explain why the pneumatic piston stumbles when it hits an obstacle.