The hot water needs of a household are to be met by heating water at 15°C to 95°C by a parabolic solar collector at a rate of 1.8 kg/s. Water flows through a 4-cm-diameter thin aluminum tube whose outer surface is blackanodized 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 200 W per meter length of the tube, determine the required length of the parabolic collector to meet the hot water requirements of this house. Also, determine the surface temperature of the tube at the exit. Parabolic solar collector Water 95°C 1.8 kg/s Glass tube Water tube

The hot water needs of a household are to be met by heating water at 15°C to 95°C by a parabolic solar collector at a rate of 1.8 kg/s. Water flows through a 4-cm-diameter thin aluminum tube whose outer surface is blackanodized 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 200 W per meter length of the tube, determine the required length of the parabolic collector to meet the hot water requirements of this house. Also, determine the surface temperature of the tube at the exit. Parabolic solar collector Water 95°C 1.8 kg/s Glass tube Water tube

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The hot water needs of a household are to be met by heating water at 15°C to 95°C by a parabolic
solar collector at a rate of 1.8 kg/s. Water flows through a 4-cm-diameter thin aluminum tube whose
outer surface is blackanodized 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 200 W per meter length
of the tube, determine the required length of the parabolic collector to meet the hot water requirements
of this house. Also, determine the surface temperature of the tube at the exit.
Parabolic
solar collector
Water
95°C
1.8 kg/s
Glass tube
Water tube

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