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A solar collector is irradiated by solar flux and a diffuse atmospheric flux. The solar flux...
PLEAS SHOW ALL WORK, Explain your steps for part b pleas! 12.50 A small, opaque, diffuse...
PLEAS SHOW ALL WORK, Explain
your steps for part b pleas!
12.50 A small, opaque, diffuse object at T, = 400 K is sus- pended in a large furnace whose interior walls are at T; = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 0.7 0.5 w 1 3 a (um) (a) Determine the total emissivity and absorptivity of the...
PLEAS SHOW all work and EXPLAIN all steps THANK YOU - A small, opaque, diffuse object...
PLEAS SHOW all work and
EXPLAIN all steps THANK YOU
- A small, opaque, diffuse object at T, 400 K is sus- pended in a large furnace whose interior walls are at Tf = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 12. 0.7 0.5 0 1 3 a (um) (a) Determine the total emissivity and absorptivity of the surface....
A small object with an opaque, diffuse surface at a temperature of 500 K is suspended...
A small object with an opaque, diffuse surface at a temperature
of 500 K is suspended in a large furnace with walls at 2000 K.
Assume that the walls of the furnace provide a diffuse irradiation
to the object at a blackbody temperature equal to the furnace wall
temperature. The object’s surface has a spectral hemispherical
emissivity and absorptivity as given below. (a) Determine the total
emissivity and total absorptivity of the object’s surface. Partial
Ans: ?=0.021 (b) Evaluate the...
124 3 RADIATIVE PROPERTIES OF REAL SURFACES 3.3 For optimum performance a solar collector surface has been treated...
124 3 RADIATIVE PROPERTIES OF REAL SURFACES 3.3 For optimum performance a solar collector surface has been treated so that, for the spectral, directional emittance < 45° 0> 45° λ<2 μm, 0 0.9 cos 20, 0.0 all 0, λ> 2 μη. 0.1, For solar incidence of 15° off-normal and a collector temperature of 400 K, what is the relevant ratio of absorptance to emittance? 3.4) A long, cylindrical antenna of 1 cm radius on an whose emittance is Earth-orbiting satellite...
5 The roof of a car in a parking lot absorbs a solar radiant flux of...
5 The roof of a car in a parking lot absorbs a solar radiant flux of 800 W/m2 and the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 12 W/m2.K. (a) Neglecting radiation exchange with the surroundings, calculate the temperature of the roof under steady state conditions if the ambient air temperature is 20°C. (b) For the same ambient air temperature, calculate the temperature of the roof if its surface emissivity is 0.8.
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from...
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from sun at 5800° K) of 600 W/m2, and an effective sky temperature of -40° C. The plate surface temperature is kept at Ts 60 C (at steady state condition). Calculate natural convection heat transfer coefficient from the plate. (10 points) What is the electrical power (W/m2)...
Measurement of the spectral, directional absorptivity of a certain non-reflecting surface shows that directional and spectral...
Measurement of the spectral, directional absorptivity of a
certain non-reflecting surface shows that directional and spectral
dependencies may be model as the product of two independent
functions:
This surface is irradiated by diffuse blackbody radiation at a
temperature of 5800 K. Note that the intensity of ideal radiation
can be calculated at Ib=
Eb/pi(W/m2 -sr). The surface is at a uniform
temperature of 300 K.
Determine the rate that energy is absorbed by the surface
(W/m2 )
Determine the net...
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
A flat-plate solar collector is used to heat atmospheric air flowing through a rectangular channel. The...
A flat-plate solar collector is used to heat atmospheric air flowing through a rectangular channel. The bottom surface of the channel is well insulated, while the top surface is subjected to a uniform heat flux 96,which is due to the net effect of solar radiation absorption and heat exchange between the absorber and cover plates. W Transparent cover plate Absorber plate Rectangular channel Air Tmi, m Beginning with an appropriate differential control volume, obtain an equation that could be used...
An unglazed flat plate solar water heater is orientated perpendicular to the sun such that the in...
An unglazed flat plate solar water heater is orientated perpendicular to the sun such that the incident radiation reaching the plate is 1100 W/m2. The plate has a semi selective coating such that the plate absorptivity and emissivity is equal to unity for all wavelengths up to 2µm, and 0.13 for all λ > 2µm. Coolant flowing in the collector tubes removes heat at such a rate as to maintain the plate temperature at 80°C. Considering the sun to be...
PLEAS SHOW ALL WORK, Explain
your steps for part b pleas!
12.50 A small, opaque, diffuse object at T, = 400 K is sus- pended in a large furnace whose interior walls are at T; = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 0.7 0.5 w 1 3 a (um) (a) Determine the total emissivity and absorptivity of the...
PLEAS SHOW all work and
EXPLAIN all steps THANK YOU
- A small, opaque, diffuse object at T, 400 K is sus- pended in a large furnace whose interior walls are at Tf = 2000 K. The walls are diffuse and gray and have an emissivity of 0.20. The spectral, hemispherical emissivity for the surface of the small object is given below. 12. 0.7 0.5 0 1 3 a (um) (a) Determine the total emissivity and absorptivity of the surface....
A small object with an opaque, diffuse surface at a temperature
of 500 K is suspended in a large furnace with walls at 2000 K.
Assume that the walls of the furnace provide a diffuse irradiation
to the object at a blackbody temperature equal to the furnace wall
temperature. The object’s surface has a spectral hemispherical
emissivity and absorptivity as given below. (a) Determine the total
emissivity and total absorptivity of the object’s surface. Partial
Ans: ?=0.021 (b) Evaluate the...
124 3 RADIATIVE PROPERTIES OF REAL SURFACES 3.3 For optimum performance a solar collector surface has been treated so that, for the spectral, directional emittance < 45° 0> 45° λ<2 μm, 0 0.9 cos 20, 0.0 all 0, λ> 2 μη. 0.1, For solar incidence of 15° off-normal and a collector temperature of 400 K, what is the relevant ratio of absorptance to emittance? 3.4) A long, cylindrical antenna of 1 cm radius on an whose emittance is Earth-orbiting satellite...
5 The roof of a car in a parking lot absorbs a solar radiant flux of 800 W/m2 and the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 12 W/m2.K. (a) Neglecting radiation exchange with the surroundings, calculate the temperature of the roof under steady state conditions if the ambient air temperature is 20°C. (b) For the same ambient air temperature, calculate the temperature of the roof if its surface emissivity is 0.8.
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from sun at 5800° K) of 600 W/m2, and an effective sky temperature of -40° C. The plate surface temperature is kept at Ts 60 C (at steady state condition). Calculate natural convection heat transfer coefficient from the plate. (10 points) What is the electrical power (W/m2)...
Measurement of the spectral, directional absorptivity of a
certain non-reflecting surface shows that directional and spectral
dependencies may be model as the product of two independent
functions:
This surface is irradiated by diffuse blackbody radiation at a
temperature of 5800 K. Note that the intensity of ideal radiation
can be calculated at Ib=
Eb/pi(W/m2 -sr). The surface is at a uniform
temperature of 300 K.
Determine the rate that energy is absorbed by the surface
(W/m2 )
Determine the net...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
A flat-plate solar collector is used to heat atmospheric air flowing through a rectangular channel. The bottom surface of the channel is well insulated, while the top surface is subjected to a uniform heat flux 96,which is due to the net effect of solar radiation absorption and heat exchange between the absorber and cover plates. W Transparent cover plate Absorber plate Rectangular channel Air Tmi, m Beginning with an appropriate differential control volume, obtain an equation that could be used...
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