Air enters a heat exchanger at a volumetric flow rate of 50 m3/min at 305 k and 100 kpa. air exits at 295 k and 95 kpa (this means that the air stream of the heat exchanger is not ideal, as there is a drop in pressure). r-134a enters the heat exchanger at 0.5 mpa at a quality of 0.2. r-134a exits at 20°c. a. draw the t-v diagram for air. b. draw the p-v diagram for air. c. draw the t-v diagram for r-134a. d. draw the p-v diagram for r-134a. e. determine the mass flow rate of r-134a. f. determine the heat transfer from the air stream in units of kj/min. g. clearly outline every assumption that must be made to determine the mass flow rate and heat transfer.

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

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?

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)?