From the diameter of the sun and the earth and the mean distance of sun from earth, estimate (a) the amount of energy emitted from the sun, (b) the amount of energy received by the earth, and (c) the solar constant for a sun temperature of 5700K. If the distance of Planet-Y from the sun is 7.0 astronomical unit, estimate, (c) the solar constant for Planet-Y for a sun temperature of 5700K. (Stefan-Boltzmann constant, o = 5.67 x 10-8 W/m2-K4). Diameter of the sun = 1,392,000 km; Diaplanet-y = 340,800 km; Mean distance of the sun from the earth = 149,600,000 km 10m r Sun R Aa Ar Concentrator

From the diameter of the sun and the earth and the mean distance of sun from earth, estimate (a) the amount of energy emitted from the sun, (b) the amount of energy received by the earth, and (c) the solar constant for a sun temperature of 5700K. If the distance of Planet-Y from the sun is 7.0 astronomical unit, estimate, (c) the solar constant for Planet-Y for a sun temperature of 5700K. (Stefan-Boltzmann constant, o = 5.67 x 10-8 W/m2-K4). Diameter of the sun = 1,392,000 km; Diaplanet-y = 340,800 km; Mean distance of the sun from the earth = 149,600,000 km 10m r Sun R Aa Ar Concentrator

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.25P: 1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see...

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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 rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
1. Solar Collector Problem: From the diameter of the sun and the earth and the mean distance of sun from earth, estimate (a) the amount of energy emitted from the sun, (b) the amount of energy received by the earth, and (c) the solar constant for a sun temperature of 5700K. If the distance of Planet-Y from the sun is 7.0 astronomical unit, estimate, (c) the solar constant for Planet-Y for a sun temperature of 5700K. (Stefan-Boltzmann constant, o = 5.67 x 10-8 W/m2-K4). Diameter of the sun = 1,392,000 km; DiaPlanet-y = 340,800 km; Mean distance of the sun from the earth = 149,600,000 km r Sun R 0₂ m Aa ||A₂ Ar Concentrator
The solar power striking Earth every day averages 168watts per square meter. The highest ever recorded electricalpower usage in New York City was 13,200 MW. A recordestablished in July of 2013. Considering that present technologyfor solar energy conversion is about 10% efficient,from how many square meters of land must sunlight becollected in order to provide this peak power? (For comparison,the total area of New York City is 830 km2.)
Molten metal at 2000 C is poured using crucible. The liquid metal jet has a diameter of 3 mm with an insulation shield of 5 cm diameter. There is a slit of 30 degrees around the insulation shield. The temperature inside the room is 30 C and the shield is 700 C. Assuming black bodies, find the net heat transfer between jet and shield, jet and room, shield and the room. One of the steps is wrong A) Resistance network is required to be built B) To find the view factor between metal and shield , ratio of the angles is used C) View factors are one of the most important steps to solve the problem D) None of the above E) Slit doesnot participate in radiation
A solar pond, 1.5 m deep, is built in Pondicherry (11°56' N). The horizontal pyranometer placed beside the pond on April 20 at 1.300 following values of global and diffuse radiation are measured by a Ia=0.210 kW/m² Calculate the variation of the solar radiation flux as it penetrates through the pond.
A spherical radiator has a radius of 3ft and emissivity of 0.5. If radiates 6000 Btu/hr of heat at 3000R, what is the temperature of a surface affected by its radiation?
a. What does it mean when we say that a surface 'sees itself' in the context of radiative heat transfer? b. If heat transfer by conduction through a medium occurs under steady- state, will the temperature at a particular location vary with time? Will the temperature vary with location in the medium?
Two infinite black plates of 800deg C and 340 deg C exchange heat through radiation. Calculate the heat exchange. Round your answer to 4 decimal places.
A quartz radiant heater has two cylindrical tubes 40 cm long and 1 cm radius. The heater is designed to produce 1300 watts of radiant power. What would be the temperature of the tubes if the emissivity of the tubes is 0.60. a. 570 K b. 934 K c. 980 K d. 1068 K
a) Explain how Fourier's law of conduction (in one-dimensional cartesian system) can be applied to experimentally measure the thermal conductivity of solid materials. What are the necessary conditions and assumptions? b) Two surfaces make up an enclosure where surface 1 is flat and has area A₁, temperature T₁ and emissivity &. Surface 2 is black and has temperature T2. Show that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by ε₁0 (T₁ - T₂).
What is the solar radiation on a horizontal surface in the absence of the atmosphere at latitude 36° N on March 15 for one day?