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A large refrigeration plant is to be maintained at -15°C, and it requires refrigeration at a rate of 100 kW. The condenser of the plant is to be cooled by liquid water, which experiences a temperature rise of 8°C as it flows over the coils of the condenser. Assuming the plant operates on the ideal vapor-compression cycle using refrigerant-134a between the pressure limits of 120 and 700 kPa, determine (a) the mass flow rate of the refrigerant, (b) the power input to the compressor, and (c) the mass flow rate of the cooling water.
The transition at the cross sections of the step in ductile shaft has a radius of 3 mm. Yield strength is 80 MPa, ultimate strength is 150 MPa. Determine maximum in plane shear stress in the shaft.
A rigid tank contains 1 kg of H20 at 100 kPa, x=0.1. Given that the tank can withstand a maximum internal pressure of 2 MPa, determine (a)the maximum temperature to which the steam in the tank can be heated,
A siphone generates a flow of 1 ft/sec thru a 1 inch OD, 3/4 ID hose. A) What height difference is needed to generate this flow B) What height for 10 ft/sec C) What for 100 ft/sec
Determine the power generated by the turbine (in KW) operating in steady state at 5MPa, with specific enthalpy 3000kj/kg and velocity of 10m/s at the entrance and steam escaping at 0.07MPa, specific enthalpy 2000kj/kg at velocity of 90m/s p.
An electric utility wants to build a new coal fired power plant in an urban setting. The regulatory agency has determined that in order for the plant to be permitted it must limit its emissions to prevent the ground level SO2 concentration from excee..
A complete mix activated sludge plant operates at design Q, with the reactor tank volume set by a nominal= 6 hours.. a) It was anticipated that it would operate at 25% RAS for an expected Xr= 2,000 mg/l. What would the actual be
The Navier Stokes equations in the z-direction. Define what each term in the equation means. Overall, what quantity is being conserved? Under what conditions might you be justified in assuming that non-linear terms are not important?
Find the slope and defliction at B For the cantilever beam shown here with evenly distributed load Ohm on the first 2/3 of the beam (A-B), and concentrated load at the end, C: P = 2ωa/3. Find the slope and deflection at B.
A normally consolidated clay layer in the field has a thickness of 3.2 m with an average effective stress of 70 kN/m^2. A laboratory consolidation test on the clay gave the following results: Pressure (kN/m^2)=100, 200 Void Ratio=0.905, 0.815
A tracer dye is injected into a 55-ft thick sandy gravel confined aquifer which has a hydraulic conductivity of 1.2 x 10^-3 ft/s. The dye appears 14 days later in an observation well 75 ft away from the injection point.
Assume that a chemical reaction involving the removal of a given contaminant follows first order kinetics. The rate constant, k, is 0.5 hr-1. Compare the performance of the following reactors/reactor combinations. Provide your comments your results. ..
A wood cube with 9 inch sides is inserted into water. The specific gravity of wood is 0.60. What force will need to be applied to the block downward to hold the wood cube completely submerged in water
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