Pertaining to Lab 3 Q14, why is the peak net radiation approximately the same on the two dates seen in figures 3-5 and 3-6? The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.) The data for both days must have been taken on surfaces with the same albedo Botswana is right on the equator so it has very little variation throughout the year The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days The sun angles are similar on both dates Surplus net radiation at the surface can be expendedin three general ways:sensible heat flux to the atmosphere (energyexpended in heating the air at Earth's surface),soil heat flux (energy expended in heating thesoil)latent heat flux (energy used in evaporatingmoisture from the surface).Figures 3-5 and 3-6 show the net surface radiationat Maun on March 19, 2000, and September 24, 2000,respectively.800-Net radiation600-400-200-Soil flux0-Sensibleheat-200--400Energy (watts per square meter)00:00Latentheat- 00:9012:00-- 00:81- 00:00March 19Figure 3-5. Net surface radiation-Maun, Botswana,March 19, 2000.Lab 3 The Surface Energy Budget14. Why is the peak net radiation approximately the sameon the two dates?15. How does the net surface radiation pattern differbetween the two dates during daylight hours?800600-400-200Energy (watts per square meter)0--200--400-Latentheat- 00:00- 00:9012:00Net radiationobbSoil flux- 00:8Sensibleheat- 00:00September 24Figure 3-6. Net surface radiation-Maun, Botswana,September 24, 2000.31

The amount of solar radiation reaching the earth surface is directly proportional to the incident…

Pertaining to Lab 3 Q14, why is the peak net radiation approximately the same on the two dates seen in figures 3-5 and 3-6? The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.) The data for both days must have been taken on surfaces with the same albedo Botswana is right on the equator so it has very little variation throughout the year The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days The sun angles are similar on both dates

Pertaining to Lab 3 Q14, why is the peak net radiation approximately the same on the two dates seen in figures 3-5 and 3-6? The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.) The data for both days must have been taken on surfaces with the same albedo Botswana is right on the equator so it has very little variation throughout the year The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days The sun angles are similar on both dates

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.68P: 11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is...

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1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure. The gas mixture consists of by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K, calculate (a) the effective emissivity of the gas at its temperature, (b) the effective absorptivity of the gas to radiation from the 1390 K surface, (c) the effective absorptivity of the gas to radiation from the 278 K surface, and (d) the net rate of heat transfer to the gas per square meter of surface area.
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .
Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5m, 0.6 at wavelengths from 1.5to2.5m, and 0.4 at wavelengths longer than 2.5m. The surface temperature is 1111 K.
Q#01:a) Define Radiation and give at least 3 examples.b) Define Stefan-Boltzmann Law and emissivity. Is there any surface whose emissivity valueis greater than 1? If no, explain the reason.
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		The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.)
		The data for both days must have been taken on surfaces with the same albedo
		Botswana is right on the equator so it has very little variation throughout the year
		The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days
		The sun angles are similar on both dates