Absorber plate is usually coated in black surface that water flows through.
What if the black coated surface is not black anymore, what will happened to the solar collector?
Homework Answers
The reason behind the black coating of the solar collector is that black color absorve more sun light than any other colour. Black coating help the solar collector not reflects back the light to the atmosphere. So if the black coating will removed than its efficiency of absorbing the sun light will decrease drastically because the relativity of the surface increase in absence of the black coating . Some most common black coating used are black enamel paint.
So it's affects the efficiency of the Sun light absorption.
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Absorber plate is usually coated in black surface that water flows through.
Aluminium plate painted flat black (solar absorptivity 0.98 and emissivity 0.97) Length of absorber plate is...
Aluminium plate painted flat black (solar absorptivity 0.98 and emissivity 0.97) Length of absorber plate is 1.2 m, width of absorber plate w = 0.8 m, Ambient air temperature = 25°C, effective sky temperature = 10°C, solar radiation rate = 600 w/m2. Calculate the temperature of the absorber plate?
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...
12.62 Two plates, one with a black painted surface and the other with a special coating (chemical...
12.62 Two plates, one with a black painted surface and the other with a special coating (chemically oxidized copper) are in earth orbit and are exposed to solar radiation. The solar rays make an angle of 30° with the normal to the plate. Estimate the equilibrium temperature of each plate assuming they are diffuse and that the solar flux is 1368 W/m2. The spectral absorptivity of the black painted surface can be approximated by αλ = o.95 foros λ oc...
A flat plate collector mounted on plane surface operates with efficiency of 40% it installed at a...
A flat plate collector mounted on plane surface operates with efficiency of 40% it installed at a location 45◦ N, the time is 10:00 am, April 1, 2019. When the collector faces the sun directly it delivers 870 W to the water, how much power will deliver if the surface is set at an elevation of 25◦ and facing east? You can assume that the conversion efficiency from solar power to power absorbed by the fluid remains constant, what changes...
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?...
Describe the structure and principle of operation of flat plate and evacuated tube solar collectors (both water heatin...
Describe the structure and principle of operation of flat plate and evacuated tube solar collectors (both water heating and air heating) Determine key performance parameters for a flat plate collector from collector test results C Describe the structure and principle of operation of the key storage elements of low temperature solar thermal systems -namely hot water storage tanks and rock beds C o Define and use the various angles used to specify solar position and the angle of incidence of...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the tap Tank t Cold water food Pump (a) What is the principle on which the solar collector works? Explain. (1.5 marks) (b) What is the principle on which the heat exchanger works? Explain. (1.5 marks) Q3.(a) The wavelength of radio waves is 200 m & its speed iſs 3x108m/s in free space. (1) Find the frequency of the radio waves in space? (1.5 marks)...
Both please 13.3 Estimate the amount of solar heating that is lost as a result of using one or two tempered 1/8 in thick glass plates covering a flat-plate absorber. The transmission coefficient for r...
Both please
13.3 Estimate the amount of solar heating that is lost as a result of using one or two tempered 1/8 in thick glass plates covering a flat-plate absorber. The transmission coefficient for radiation is 2% for wavelengths greater than 3 m and 80% for wavelengths ranging from 0.2 to 3 um. 13.4 The amount of solar energy captured in a given application is expressed in terms of how much thermal energy is delivered relative to the total demand...
The front surface of the glass cover of a flat plate solar collector of dimensions 1...
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
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...
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...
12.62 Two plates, one with a black painted surface and the other with a special coating (chemically oxidized copper) are in earth orbit and are exposed to solar radiation. The solar rays make an angle of 30° with the normal to the plate. Estimate the equilibrium temperature of each plate assuming they are diffuse and that the solar flux is 1368 W/m2. The spectral absorptivity of the black painted surface can be approximated by αλ = o.95 foros λ oc...
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?...
Describe the structure and principle of operation of flat plate and evacuated tube solar collectors (both water heating and air heating) Determine key performance parameters for a flat plate collector from collector test results C Describe the structure and principle of operation of the key storage elements of low temperature solar thermal systems -namely hot water storage tanks and rock beds C o Define and use the various angles used to specify solar position and the angle of incidence of...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the tap Tank t Cold water food Pump (a) What is the principle on which the solar collector works? Explain. (1.5 marks) (b) What is the principle on which the heat exchanger works? Explain. (1.5 marks) Q3.(a) The wavelength of radio waves is 200 m & its speed iſs 3x108m/s in free space. (1) Find the frequency of the radio waves in space? (1.5 marks)...
Both please
13.3 Estimate the amount of solar heating that is lost as a result of using one or two tempered 1/8 in thick glass plates covering a flat-plate absorber. The transmission coefficient for radiation is 2% for wavelengths greater than 3 m and 80% for wavelengths ranging from 0.2 to 3 um. 13.4 The amount of solar energy captured in a given application is expressed in terms of how much thermal energy is delivered relative to the total demand...
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
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