At the inlet to an axial diffuser the velocity of the approaching air is 420 m/s, the stagnation pressure is 300 kpa, and the stagnation temperature is 600 k. at exit the stagnation pressure is 285 kpa and the static pressure 270 kpa. using compressible flow analysis, determine (i) the static temperature, static pressure, and mach number at inlet and the diffuser efficiency; (ii) the mach number at exit and entry. for air take γ = 1.376 and r = 287 j/(kg k).

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?