3000 kg of water is heated per hour from 30 to 70 0C by pumping it through a certain heated section of a 25 mm diameter tube. If the surface of the heated section is maintained at 110 0C, estimate length of the heated section and the rate of heat transfer from the tube to water. The thermo-physical properties of water are: ρ = 971.6 kg/m3 ; μ = 0.355 x 10-3 kg/m-s; k = 0.667 W/m-deg; Cp = 4195 J/kg-deg. Use Nu = 0.023 (Re) 0.8 (pr) 0.4

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.

On a average work day more than work place firs are reorted

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater