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1. Refrigerant 134a at a flow rate of 0.5 lb/s enters a heat exchanger in a refrigeration system operating at steady state as saturated liquid at 08F and exits at 208F at a pressure of 20 lbf/in.2 A separate air stream passes in counterflow to the Refrigerant 134a stream, entering at 1208F and exiting at 778F. The outside of the heat exchanger is well insulated. Neglecting kinetic and potential energy effects and modeling the air as an ideal gas, determine the mass flow rate of air, in lb/s.
2. Oil enters a counterflow heat exchanger at 450 K with a mass flow rate of 10 kg/s and exits at 350 K. A separate stream of liquid water enters at 208C, 5 bar. Each stream experiences no significant change in pressure. Stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. The specific heat of the oil is constant, c 5 2 kJ/kg ? K. If the designer wants to ensure no water vapor is present in the exiting water stream, what is the allowed range of mass flow rates for the water, in kg/s?
if the velocity v of a paticle moving along a straight line decreases linearly with its displacement from 20ms to a
Plot the engineering stress-strain curve. Determine i. Young's modulus, ii. the 0.2% offset yield strength, iii. the tensile strength, iv. the percent elongation, and v. the percent reduction of area.
a one dimensional wall of material kw10wmk is 50 mm thick with uniform heat generation qlsquolsquolsquo5106wm3. the
a plate clutch has a single pair of mating friction surfaces 300 mm od by 225 id. the mean value of the coefficient of
Geometric angle of attack, The Piper Cherokee has a wing area of 170 ft2 and a wing span of 32 ft. Its maximum gross weight is 2450 lbs. The wing uses a NACA 65-415 airfoil, which has a lift slope of 0.10331deg^-1 and alpha(L=0)= -3.0deg. Assume th..
A piston -cylinder device contains 0.06 m3 of saturated water vapor at 350 KPa pressure. Determine the temperature and the mass of the vapor inside the cylinder.
find the thermal conductivity in wm-1 k-1 and thermal diffusivity m2s-1 for a new insulating material for which the
1. Design a combinational logic circuit which will accept a 4-bit binary number and if the number is even, divide it by 210 and produce the binary result; if the number is odd, multiply it by 210 and produce the binary result. 2. a. Fill in the Ka..
consider a cogeneration power plant modified with regeneration. steam enters the turbine at 6 mpa and 450 celsius and
what is the specific volume of water at 50 mpa and 80 degrees celcius. what would it be if the incompressible liquid
if the seat pocket diameter in a ball valve is 5.000 the seat seal ring to ball sealing diameter is 4.438 and the
a two stage cascade refrigeration system is to provide cooling at -40c while operating the high temperature condenser
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