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1. The condenser in a refrigerator receives R-134a at 700 kPa, 50?C and it exits as saturated liquid at 25?C. The flow rate is 0.1 kg/s, and the condenser has air flowing in at ambient 15?C and leaving at 35?C. Find the minimum flow rate of air and the heat exchanger second-law efficiency.
2. A flow of steam at 10 MPa, 550?C goes through a two-stage turbine. The pressure between the stages is 2 MPa, and the second stage has an exit at 50 kPa. Assume both stages have an isentropic efficiency of 85%. Find the second-law efficiencies for both stages of the turbine.
The brass tube AB (E=105 GPa) has a cross-sectional area of 140 mm^2 and is fitted with a plug at A. The tube is attached at B to a rigid plate that is itself attached at C to the bottom of an aluminum cylinder
A factory discharges its waste into a river upstream from a lake. The discharge release rate is 2 kg formaldehyde per day. The decay is a first order process with a decay rate of 0.000005/s. The waste is discharge into the river 30 km upstream from t..
Derive an equation for the reaction force (Rx) associated with conservation of momentum in a straight length of pipe of uniform diameter. Approximate the velocity as steady and uniform at each cross-section, and the fluid as constant density.
The cord wrapped securely around the inner cylinder is fastened to point A.
An Engineer is considering the development of a small wind turbine (D=1.25m) for home applications. The design wind speed is 15 mph at T=10C and p=0.9 bar. The efficiency of the turbine is n=20% meaning that 20% of the kinetic energy in the wind can ..
Each rod has a diameter of 20 mm. Assume that a = 2.8 m, b = 1.6 m, and c = 0.5 m. If the normal stress in any rod may not exceed 155 MPa, determine the maximum load P that may be applied at A.
A structural element subjected to cyclic loading is made of fc’ = 3000 psi concrete. Compressive stresses are changing between 2200 psi and 1600 psi. The frequency of loading is 8 Hz. After 10 years of uninterrupted loading, evaluate damage of materi..
Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
Why IRC 37-2012 has taken 90th percentile for pavement design of expressway or NH while they hav taken 80th percentile for state highway design?
A 2-ft diameter circular pipe has a Manning's n of 0.013 and a bed slope of 2.0 X 10^-3. What is the uniform flow rate in this pipe if it is completely full (Qf) in ft^3/s
Outside diameter is 10 cm and inner diameter is 9.5cm. The Mass of the ring is 16g. The force required is the weight corresponding to a mass of 16g. What's the surface tension of the liquid
The kill of pathogens by disinfection in water treatment can be described by a first order reaction. Complete a reactor comparison for a batch reactor, CSTR and PFR for disinfection. The treatment plant produces 100 L/s of water.
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