30. GO A solar collector is placed in direct sunlight where it absorbsenergy at the rate of 880 J/s for each square meter of its surface. Theemissivity of the solar collector is e = 0.75. What equilibrium tempera-ture does the collector reach? Assume that the only energy loss is due tothe emission of radiation.

The expression for find equilibrium temperature is Q=eσAT4T=QeσA14

Answered: 30. GO A solar collector is placed in…

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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An electric stove burner has surface area 325 cm² and emissivity e = 1. The burner consumes 1500 W and is at 900 K. If room temperature is 300 K, what fraction of the burner's heat loss is from radiation?
A small electric immersion heater is used to heat 100 g of water for a cup of instant coffee. The heater is labeled “200 watts”. Calculate the time required to bring all this water from 23.0 °C to 100 °C, ignoring any heat losses. Assume specific heat of water is 4.187 J/g-°C.
The surface of the Sun has a temperature of about 5 800 K. The radius of the Sun is 6.96 × 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity is 0.986.
b) A spherical infrared heater of radius 5.9 cm has an emissivity of 0.82. What temperature must it run at if the required power is 0.32 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =
50 W/m2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m2 surface area will be close to (c = 3 x 10 m/s):
Calculate the rate of energy transferred via radiation from the surface of a spherical ice cube with radius 0.014 m. The air temperature is 295 K and the surface of the ice cube is 273 K. The emissivity of the ice cube's surface is 0.24.
There is a small high-orbit satellite in space that is generating a lot of waste heat (at the rate of 800 W = 800 J/s) which we need to get rid of by radiation into deep, cold space (temperature 2.73 K). The external radiator of the satellite has a surface area of 1 m by 2 m, and can radiate from only one side. It has an emissivity of 0.99. What is the equilibrium (stable) temperature of the radiator in °C? a) 30.12 0C b) 290.54 0C c) 17.39 0C
A concerned mother is dressing her child for play in the snow. The child’s skin temperature is 34.0°C and the outside air temperature is1.5°C. If the emissivity of the child’s skin is 0.710 and he has 0.0115 m2 of exposed skin area, what is the amount of energy transferred from his body to the surroundings in 1.00 h?
A student is trying to decide what to wear. His bedroom is at 20°C. His skin temperature is 35°C. The area of his exposed skin is 1.50 m². People of all races have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy loss from his body by radiation in 10.0 min.
A student is trying to decide what to wear.His bedroom is at 20°c.His skin Temperature is 35.0°c.The area of his exposed skin is 1.50 sq.mitres.People all over the world have skin that is dark in the infrared,with emessivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 minutes.
Solar panels on one of the NWU solar car prototype, have an emissivity of e = 0.819. When in direct sunlight, they absorb energy at a rate of 877 J/s per square meter of surface. Assume that the only energy loss is due to the emission of radiation. What equilibrium temperature are the panels reaching?
Q12. (a) Name any four types of radiation emitted by the sun? (b) A solar hot water system receives solar energy at the rate of 10.5 MJm2 per day. The efficiency of the solar collector is 0.8 and it has an area of 6.0 m2. The collector contains 0.250 m3 volume of water and the density of water is assumed to be 1000 kgm 3. The specific heat capacity of water C 4200 J/Kg. C. (i) Calculate the mass of water? (ii) Estimate the temperature rise of the water in the tank during the day.

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