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Saturated water vapor leaves a steam turbine at a flow rate of 1.5 kg/s and a pressure of 0.51 bar. The vapor is to be completely condensed to saturated liquid in a shell-and-tube heat exchanger that uses city water as the cold fluid. The water enters the thin-walled tubes at 17°C and is to leave at 57°C. Assuming an overall heat transfer coefficient of 2000 W/m2 · K, determine the required heat exchanger surface area and the water flow rate. After extended operation, fouling causes the overall heat transfer coefficient to decrease to 1000 W/m2 · K, and to completely condense the vapor, there must be an attendant reduction in the vapor flow rate. For the same water inlet temperature and flow rate, what is the new vapor flow rate required for com- plete condensation?
It is known that a long log floats with its axis horizontal. A very short log, however, floats with its axis vertical. Determine the maximum length of a cylindrical walnut log 30 cm in diameter that will cause it to float with its axis vertical.
a wellinsulated counterflow heat exehanger operates at steady state. in one stream liquid water enters at 10 degree
a horizontal circular cylinder of diameter d 0.2m and length 2m is elastically mounted on two springs and towing tank
Saturated liquid water is compressed from 100 kPa (State 1) to 2.5 MPa (State 2) in an adiabatic pump having 85% isentropic efficiency. Calculate the specific work (kJ/kg) required for the compression of liquid water. Determine the entropy generation..
The figure on the right shows an approximated pressure distribution on an airfoil and the direction of incoming flow. Alpha is 10 degrees, the pressure distribution on the top is 3n/m and on the bottom is 1n/m. The chord Length is 1 meter.
the rotor of an electric motor has a mass of 25kg and a radius of gyration of 180mm. it is observed that 4.2 min is
Determine the n- and t-components of the force F which the spring of modulus k = 1.4 kN /m exerts on the pin. The distance r = 400 mm.
a shaft with a diameter of 100 mm rotates at 1500 rpm. a fluid-film bearing is designed to support a 5 kn load. assume
determine the torsional strength and stiffness of a closed thin walled tube of mean radius r and thickness t and a
Calculate the fraction of atom sites that are vacant for copper (Cu) at a temperature of 729°C (1002 K). Assume energy for vacancy formation of 0.90 eV/atom. Repeat this calculation at room temperature (298 K).
It is given that a- iron has a BCC crystal structure, an atomic radius R = 0.124 nm, and atomic weight AFe = 55.85 g/mol. Calculate the following quantities for a- iron: Lattice parameter. Total number of atoms in the unit cell. Volume of the unit ce..
water at 25 degrees c enters a heat exchanger at 0.1 kgs and exits at 50 degrees c. kerosene enters the other side of
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