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.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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.

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