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The hot-water needs of a household are to be met by heating water at 55°F to 180°F by a parabolic solar collector at a rate of 4 lbm/s. Water flows through a 1.25-in-diameter thin aluminum tube whose outer surface is black-anodized in order to maximize its solar absorption ability. The centerline of the tube coincides with the focal line of the collector, and a glass sleeve is placed outside the tube to minimize the heat losses. If solar energy is transferred to water at a net rate of 400 Btu/h per ft length of the tube, determine the required length of the parabolic collector to meet the hot-water requirements of this house.
Using the average daily arrival rates for the months of January through June 2012, a simple linear regression model for the data documenting public transportation usage. The single causal factor considered was a linear trend. The resulting regression..
nitrogen gas is heated in a steady-state steady-flow process. the inlet conditions are 550 kpa 35degc and the exit
two moles of nitrogen are initially at 10 bar and 600 k state 1 in a horizontal pistoncylinder device. they are
what is the use of dimentionsless numbers, and why the temperature is max on gas turbine blade tip.
an elevator is created by using a hose hanging from the top of a 10 m building. the hose is diverted into 4 jets at the
a closed system of mass 6lbm undergoes a process in which there is a heat transfer of 245 ft-lbf from the system to
What load is needed to generate a transverse center displacement of 5 mm for an aluminium beam of 15 cm length, 2 cm width and 2 mm thickness (in three-point bending). Determine what strain you expect at the bottom surface for this deflection for Al ..
heat is transferred steadily to boiling water in a pan through its flat bottom at a rate of 650 w. if the temperature
a roller coaster starts from rest at a rolls down the track to b describes a circular loop of 40-ft diameter and moves
The flow around a model of a turbine blade is investigated. The model is five times larger than the prototype. A maximum pressure of 4 psi is measured at the leading edge, a maximum velocity of fps is measured near the top of the blade, and a small d..
a piston-cylinder device initially contains 0.15-kg of steam at 3.5 mpa superheated by 5degc. now the steam loses heat
A spray attemperator receives 125 kg/s of steam at 80 bar and 540°C. It uses spray water from the feed water line at 200°C. The attemperator exit is at 78 bar and 480°C. How much feed water is used in kilograms per second?
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