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Calculate the top heat-loss coefficient for a solar collector with a single glass cover having the following specifications (neglect edge effects), also calculate the ambient air temperature:
Overall heat-loss coefficient 3.46 W/(m2.K)
Convection heat-transfer coefficient (hc,p-c) 2.65 W/(m2.K)
Spacing between the plate and the cover 2.5 cm
Plate emissivity 0.2
Glass emissivity 0.88
Back insulation thickness 5 cm
Conductivity of back insulation material 0.045 W/(m.K)
Mean plate temperature 373 K
Temperature of cover 298 K
Collector tilt 45o
Wind heat transfer coefficient 10 W/(m2.K)
when a soft iron piece is buried under the surface of earth in the north south direction why the iron piece show properties of a magnet
Direction of Acceleration and Velocity Knowing the size of a distance or speed is frequently meaningful for creating comparisons. For example, for some reasons it may be enough
A thermocouple is used to calculates very high (2000 0 C) as well as very low (- 200 0 C) temperature in industries and laboratories. The thermocouple used to measure very high tem
Q. Cart on Track which consists of a vertical circular loop? Here we have a cart on a track which consists of a vertical circular loop. Of course we don't want the cart to fall
The engine on a motorcycle hums at 85 Hz. If the motorcycle travels toward a resting observer at a velocity of 29.6 m/s, what frequency does the observer hear? Use 343 m/s
for assignment.
The method by which the identity of a nucleus is changed when it is bombarded by an energetic particle is known as nuclear function. The general relation for the nuclear reaction i
It is described to this law, if the temperature T of the object is not very dissimilar from that of the environment T0, then rate of cooling -dT/dt is proportional to the temperatu
What is Equatorial and polar diameter? The equatorial diameter. The equatorial diameter of the earth is 7920 miles in length and polar diameter is about 27 miles shorter than the
When the wavelength of wave remains unchanged, the scattering is known as elastic.
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