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1. A glass plate is used as a cover in a flat plate solar collector. The...
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...
4. A solar collector has a two sheets of glass as cover. The glass has refractive index of 1.45 and absorptivity 10%. The angle of the Sun with respect to the normal is 1-60 degrees. (a) Determin...
4. A solar collector has a two sheets of glass as cover. The glass has refractive index of 1.45 and absorptivity 10%. The angle of the Sun with respect to the normal is 1-60 degrees. (a) Determine the effective transmissivity of the glass. (b) What is the critical angle.
4. A solar collector has a two sheets of glass as cover. The glass has refractive index of 1.45 and absorptivity 10%. The angle of the Sun with respect to the...
Solar radiation is incident on a flat-plate collector at a rate of 450 W/m^2. The product...
Solar radiation is incident on a flat-plate collector at a rate of 450 W/m^2. The product of transmissivity and absorptivity if 0.85, and the heat loss coefficient of the collector is 4/5 W/m^2 C. The ambient air temp is 10 C. The collector temperature at which the collector efficiency is zero is (A.) 95 C (B) 104 C (C) 112C (D) 87C (e) 73C
Determine the overall heat transfer coefficient (UL) for a Flat Plate Solar Collector inclined at 45...
Determine the overall heat transfer coefficient (UL) for a Flat Plate Solar Collector inclined at 45 degrees to the horizontal and facing south. The average ambient temperature for the day is 20 degrees C and the observed glass and absorber plate temperatures are 45 degrees C and 69 degrees C respectively. The system is provided with 6 cm thick insulation (glass wool, k = 0.04 W/m degrees C) at the bottom. The air space between the absorber plate and glass...
A solar collector consists of a flat plate that absorbs the heat of sunlight. A water...
A solar collector consists of a flat plate that absorbs the heat of sunlight. A water pipe attached to the back of the plate carries away the absorbed heat. Assume that the solar collector has an area of 4.9 m2 facing the Sun and that the power per unit area delivered by sunlight is 1000 W/m2. What is the rate at which water must circulate through the pipe if the temperature of the water is to increase by 31 C as...
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...
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)...
Problem 3: The specifications of a flat-plate collector is as follows: τ = 0.88, α 0.97, U = 1.3 Btu/h ft2 °F. The heat removal factor for the collector is 0.92, the solar insolation is 210 Btu/h ft2...
Problem 3: The specifications of a flat-plate collector is as follows: τ = 0.88, α 0.97, U = 1.3 Btu/h ft2 °F. The heat removal factor for the collector is 0.92, the solar insolation is 210 Btu/h ft2, and the ambient air temperature is 60°F. Determine (a) the collector efficiency if the water enters the collector at 115°F and (b) the temperature of water at which the collector efficiency is zero. Take the incident angle modifier to be 1
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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?
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...
4. A solar collector has a two sheets of glass as cover. The glass has refractive index of 1.45 and absorptivity 10%. The angle of the Sun with respect to the normal is 1-60 degrees. (a) Determine the effective transmissivity of the glass. (b) What is the critical angle.
4. A solar collector has a two sheets of glass as cover. The glass has refractive index of 1.45 and absorptivity 10%. The angle of the Sun with respect to 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...
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)...
Problem 3: The specifications of a flat-plate collector is as follows: τ = 0.88, α 0.97, U = 1.3 Btu/h ft2 °F. The heat removal factor for the collector is 0.92, the solar insolation is 210 Btu/h ft2, and the ambient air temperature is 60°F. Determine (a) the collector efficiency if the water enters the collector at 115°F and (b) the temperature of water at which the collector efficiency is zero. Take the incident angle modifier to be 1
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