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Air contained in a rigid, insulated tank fitted with a paddle wheel, initially at 4 bar, 40oC and volume of 0.2 m3, is stirred until its temperature is 500 K. Assuming the ideal gas model for the air, determine the amount of entropy produced, in kJ/K. Assume variable specific heats (data from Table A-22).
determine the number of automobiles with premair catalyst treated radiators needed to reduce the ozone concentration in
a carnot engine operates between temperatures of 700 and 369 k. to improve the efficiency of the engine it is decided
argon at 2mpa and 500oc enters an isentropic turbine. the temperature of argon at the outlet is 20oc. determine the
fully developed laminar flow occurs in a pipe line. the fluid in the pipeline has a dunamic viscosity of 0.08 nsm2 and
a pump draws water from a reservoir through a 150 mm diameter suction pipe and delivers it to a 75 mm diameter
A heat pump is used to heat a home. It draws 3 kW of electrical power, and it extracts heat at a rate of 6 kW from the cold outdoor air. At what rate does it add heat to the home? What is the heat pump's heating coefficient of performance?
a fixed quantity of air at t1 57oc and p1 222 kpa is heated at constant temperature in a piston-cylinder assembly
what are the two possible arrangements for a concentric tube heat exchanger? for each arrangement what restrictions are
Decorative water fountains consist of a water reservoir and underground piping to and from a pump. One such system is shown schematically in the figure. The pipe material is PVC(a table is provided). The outlet line from the pump is 18 m and the inle..
Determination of the open-loop system
A piston cylinder contains 0.1 kg air at 300 K and 100 kPa. The air is now slowly compressed in an isothermal (constant temperature) process to a final pressure of 250 kPa. Air is assumed as ideal gas; the gas constant of air is R = 0.287 kJ/kg-K .
You are given a sheet of steel with a modulus of rigidity is G = 80.8 Gpa, a length L = 1 m, width w = 100 mm, and thickness t = 1 mm. You are asked to design a shaft cross-section by shaping the given steel sheet. The machine that is available to yo..
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