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Calculating the power requirement of a compressor.
the refrigerant is R22
The mass flow rate is 0.474kg/s, when it is an adiabatic process, the suction line temperature is -5°C and 5 superheat, the enthalpy is 251.6kJ/Kg
the discharge line enthalpy is 294.2 KJ/Kg
However, the compressor adiabatic efficiency is 70%, so what is the real enthalpy of the discharge line.
Actually, the same question, what does compressore adiabatic efficiency mean?
Calculate the surface temperature of the metal and estimate the uncertainty.
If the blades are originally at rest and begin to turn with a constant angular acceleration of ac = 0.5 rad/s^2, determine the magnitude of the velocity and acceleration of points A and B on the blade when t = 4s.
Formulate this as a linear programming problem and solve. What is the optimal make or buy plan for the company?
Constructing the foundation causes changes in the levels of vertical stress at all points in the soil. One such point lies at the centre of the footing plan, and is at a depth of 10 m. Determine the increment of vertical stress there.
The pavement is on a base which has a modulus of subgrade reaction of 250 pci. A 17,000 lb corner load is applied (al is 7 inches). Using the revised Westergaard equations, find the modulus of elasticity of the pavement if a corner deflection of 0..
A tubular aluminium bar (G=28GPa) of square cross section with outer dimensions 50mm x 50mm must resist a torque T=300Nm. Calculate the minimum required wall thickness t_min if allowbale shear stress is 20MPa
When the 100-lb block is at h = 3 ft above the cylindrical post and spring assembly, it has a speed of v = 20 ft/s. If the post is made of 2014-T6 aluminum and has a diameter of d = 2 in., determine the required minimum stiffness k of the spring s..
A piston of 4 lbm is accelerated to 60 ft/s from rest. What constant gas pressure is required if the area is 4 in.2, the travel distance is 4 in., and the outside pressure is 15 psia?
A liquid of 80 mole percent propane and 20 mole percent n-pentane is to be diluted with methane. Will all mixtures of the liquid and methane be single phase at 160 F and 500 psia
Prepare a set of profile leveling notes for the data listed and show the page check. All the data is given feet. The elevation of BM A is 659.08 and the elevation of BM B is 648.47
Determine the volume of water lost (in m3) through evaporation during a year from Lake Okeechobee (Florida). Lake Okeechobee has a surface area of 190,000-ha located in a region where the annual rainfall is 1500 mm. The increase in the depth of the l..
A channel of a rectangular section is to take a certain discharge Q at critical flow; prove that for the wetted perimeter, P=b+2y to be minimum, the water depth must be three-quarters of the width
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