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In an attempt to reduce cost, a solar designer has proposed replacing the shell-and-tube heat exchanger in Figure 7.27 with a tube coil immersed in the storage tank. The shelland-tube heat exchanger originally specified had a surface area of 10 m2 and a U value of 2000 W/m2 K to be used with a 100 m2 solar collector. Using Equation 7.66 to estimate the U value of the submerged coil, how much length of 0.5 in. (1.27 cm) diameter copper pipe would be needed to achieve the same value of UA product as the shell-and-tube heat exchanger? What percentage of the storage tank volume would be consumed by this coil if 50 kg of water is used per square meter of collector? Use a storage water temperature of 60°C and a collector water outlet temperature of 70°C for the calculations.
a mass of 1 kg attached to a spring with a spring constant of 112 nm oscillates horizontally on a smooth frictionless
Two wires of infinite length are placed at a distance D = 10cm on opposite sides of a point O, both wires carry the same current of 1.0 A, in which direction must this current flow in order for the magnetic field strength at O to be non-zero.
The humidity of air can be determined by use of two different thermometers; a 'dry bulb' thermometer and a 'wet bulb' thermometer. explain how these thermometers can be used to estimate the amount of water vapour in the air.
air at 1 atm and 35c flow across a 5 cm diameter cylinder at velocity 50 ms . the cylinder surface is maintained at
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Prepare young engineers through hands on experience in writing project technical report to execute tasks related to design practical fluid system.
an air preheater for a power plant consists of a cross-flow heat exchanger with hot exhaust gases used to heat incoming
a piston cylinder assembly containing h2o initially has a temperature of 130degc and a specific internal energy of 700
steam at 80 bar 440oc enters a turbine at 1operating at steady state with a volumetric flow rate of 236 m3min. twenty
Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at -16oC with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70oC. Changes in KE and PE from inlet to exit can be ignored.
a police car traveling at 101.7 kmh is traveling west chasing a motorist traveling at 77.0 kmh.a what is the velocity
a gas turbine burns methane with 150 theoretical air. assume the air is 25 degrees celsius 100 kpa and has a relative
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