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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
a 600 mm diameter wheel rolls without slipping on a horizontal surface as shown. rod ab is attached to the wheel at a
Design of absorption column and the cooler. Process design of other units should be completed along with pipe sizes.
a cylinder having an initial volume of 3 msup3 contains 0.1 kg of water at 40ordmc. the water is then compressed in an
A 1300 car is traveling along a straight road at 18 . Two seconds later its speed is 21. What is the magnitude of the net force acting on the car during this time?
An insulated rigid tank contains a saturated liquid-vapor mix of water initially at a pressure of 100 kPa. The mass of the mixture is 5 kg, but only 75.6 % of the total mass is liquid. An electric resistance heater is turned on within the tank until ..
1. list three engineering components applications that in your judgment need high stiffness and low weight. what
Water at 350 psia and 800oF enters a nozzle whose inlet are is 0.4 ft2. The flow rate of steam is 20 lbm/s. Steam leaves at 150 psia and at 825 ft/s. Heat losses from the nozzle per is 3.2 BTU/lbm. What is the inlet velocity and the exit temperature.
Genetically engineered bacteria (used to produce insulin) are immobilized in a solid agar disc (cylinder with flat surface facing up - 100 cm diameter, 5 cm height), which is exposed to large volume of stirred liquid media on both of the flat surface..
consider a person standing in a room at 18c. determine the total rate of heat transfer from the person if the exposed
two tissues a and b are placed in a gas chamber and equilibrated with carbon monoxide gas at various partial pressures
two large well-insulated tanks of 2m diameter and 5m in height are filled with air. one tank is initially at 1bar and
What is the difference between the cooling rate and hardenability? How the sample sizes affect the cooling rate and hardenability and martensite can also be obtained through water quenching of alloy steels, why oil quenching is normally used in in..
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