5. Calculate the black body temperatures(K) from the peak wavelengths given in a) through b), and...
5. Calculate the black body temperatures(K) from the peak
wavelengths given in a) through b), and the peak wavelengths (m)
from the temperature given in c)
a) 180 nm (surface of hot star)
b) 3.5 μm (surface of cold star)
c) 50K(interstellarcloud)
Homework Answers
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5. Calculate the black body temperatures(K) from the peak
wavelengths given in a) through b), and...
3. Calculate the blackbody temperatures (K) from the peak wavelengths given in a) through b), and...
3. Calculate the blackbody temperatures (K) from the peak wavelengths given in a) through b), and the peak wavelength (m) from the temperatures given in c) through d): a. 180 nm (surface of hot star) b. 2.4 microns (surface of cold star) c. 60 K (interstellar cloud) d. 3 K cosmic microwave background radiation left over from the Big Bang
A star can be approximated to a black body mostly constituted of gas with a surface...
A star can be approximated to a black body mostly constituted of gas with a surface temperature T. From the black body density of oscillators we can demonstrate that the power emitted in the forward direction by the star of surface area A per unit wavelength is: A exp( )-1 (Eg.1) Maximum emission Using Equation I , give an approximation of the power Permitted at short wavelengths (λ<<1). c.
“A pipe is carrying hot water through a cold storage facility. The ambient air in the...
“A pipe is carrying hot water through a cold storage facility. The ambient air in the cold storage has temperature of ?5?C. To maintain uniform temperature in the cold storage, blowers installed in the facility induce a 3 m/s velocity to the cold air (which can be assumed to be flowing across the water pipe). Hot water inside the pipe has a mean velocity of 0.5 m/s. The internal and exter- nal diameter of the pipe are 8.4 cm and...
5. The energy radiating from an animal is measured. If the peak spectral radiant emittance is...
5. The energy radiating from an animal is measured. If the peak spectral radiant emittance is found at a wavelength of 9.11 um, what is the body temperature (in °C) for this animal? a. b. Assume that the animal radiates energy through the skin with 95% efficiency. Plot the radiant output (spectral radiant emittance) vs. wavelength for 1 μm um. AS30
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems:...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...
Water at 340 K and a flow rate of 5 kg/s enters a black, thin‐walled tube,...
Water at 340 K and a flow rate of 5 kg/s enters a black,
thin‐walled tube, which passes through a large furnace whose walls
and air are at a temperature of 700 K. The diameter and length of
the tube are 0.25 m and 8 m, respectively. Convection coefficients
associated with water flow through the tube and airflow over the
tube are 300 W/m2·K and 50 W/m2·K, respectively.
Write an expression for the
linearized radiation coefficient corresponding to radiation
exchange...
8. A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation...
8. A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation energy (W/m²) that can be emitted by the black body (b) Determine total radiation energy (W/m²) that can be emitted by the black body within the 5-50 um wavelength region (c) The spectral blackbody emissive power of the black body at a wavelength of 10 um.
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water a...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
(a) Calculate the sun’s energy output assuming the sun is a black body radiator at 5800K...
(a) Calculate the sun’s energy output assuming the sun is a black body radiator at 5800K surface temperature, and its diameter is 1.39E+06 km. (b) (And) from the earth orbit diameter calculate the energy actually reaching the top of the earth’s atmosphere, and compare it to the solar constant.
A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation energy...
A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation energy (W/m2) that can be emitted by the black body (b) Determine total radiation energy (W/m%) that can be emitted by the black body within the 5-50 um wavelength region (c) The spectral blackbody emissive power of the black body at a wavelength of 10 um. 12
A star can be approximated to a black body mostly constituted of gas with a surface temperature T. From the black body density of oscillators we can demonstrate that the power emitted in the forward direction by the star of surface area A per unit wavelength is: A exp( )-1 (Eg.1) Maximum emission Using Equation I , give an approximation of the power Permitted at short wavelengths (λ<<1). c.
5. The energy radiating from an animal is measured. If the peak spectral radiant emittance is found at a wavelength of 9.11 um, what is the body temperature (in °C) for this animal? a. b. Assume that the animal radiates energy through the skin with 95% efficiency. Plot the radiant output (spectral radiant emittance) vs. wavelength for 1 μm um. AS30
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...
Water at 340 K and a flow rate of 5 kg/s enters a black,
thin‐walled tube, which passes through a large furnace whose walls
and air are at a temperature of 700 K. The diameter and length of
the tube are 0.25 m and 8 m, respectively. Convection coefficients
associated with water flow through the tube and airflow over the
tube are 300 W/m2·K and 50 W/m2·K, respectively.
Write an expression for the
linearized radiation coefficient corresponding to radiation
exchange...
8. A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation energy (W/m²) that can be emitted by the black body (b) Determine total radiation energy (W/m²) that can be emitted by the black body within the 5-50 um wavelength region (c) The spectral blackbody emissive power of the black body at a wavelength of 10 um.
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
A black body has an effective surface temperature of 450°C. Determine: (a) The total radiation energy (W/m2) that can be emitted by the black body (b) Determine total radiation energy (W/m%) that can be emitted by the black body within the 5-50 um wavelength region (c) The spectral blackbody emissive power of the black body at a wavelength of 10 um. 12
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