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In a dairy plant, milk at 4°C is pasteurized continuously at 72°C at a rate of 12 L/s for 24 h a day and 365 days a year. The milk is heated to the pasteurizing temperature by hot water heated in a natural-gas-fired boiler that has an efficiency of 82 percent. The pasteurized milk is then cooled by cold water at 18°C before it is finally refrigerated back to 4°C. To save energy and money, the plant installs a regenerator that has an effectiveness of 82 percent. If the cost of natural gas is $1.10/therm (1 therm 105,500 kJ), determine how much energy and money the regenerator will save this company per year
one of the walls of a dam is at 67 degrees to the horizontal. the wall is 8 m long and 40 m wide. density of the water
a rocket is tracked by radar from its launching point a. when it is 10 seconds into its flight the following radar
one mole of an ideal gas at t 25 degc is held in a cylinder by a piston at a pressure of 1 x 107 pa. the piston
consider a single crystal cylindrical specimen of iron oriented such that a tensile load is applied along a 010
a rigid tank contains 20 lbm of air at 50 psia and 80o f. the air is now heated until its pressure doubles. determine
Steam @ 10 MPa, 600 degrees celcius enters the first-stage turbine of an ideal Rankine cycle with reheat. The steam leaving the reheat section of the steam generator is @ 500 degrees celcius
Need to get flow around cylinders in a channel by creating a grid and specifying the intial flow velocity.
consider the surface of a solid that is at an elevated temperature and exposed to cooler surroundings. by what modes is
A steam turbine is operating at a steady state with a mass flow rate of 3682 kg/h at the inlet. The power output of the turbine is 8700 kW. Steam enters the turbine at a pressure of 40 bar, temperature of 320 oC, and with a velocity of 13 m/s.
A well-insulated vessel is separated into two compartments by a partition. Compartment A contains 2 kg of water at 200C, 5 MPa and compartment B contains 0.983 kg of water at 200C, 0.1 MPa. The partition is removed and the water in both the compartme..
Consider a C-D nozzle with a throat and exit diameter of 252 mm and 657 mm, respectively. The reservoir pressure and temperature is 10 atm and 1000 K, respectively. Calculate the back pressure (Pb) for each of these scenarios:
A high-speed elevator is being designed that must be able to travel at a maximum speed of 11.5 fts. You are asked to recommend the lift motor to use. The completely furnished carriage will have a mass of 3500 pounds. The design occupancy limit will b..
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