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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)
The current transformer has a single turn on the primary winding and a secondary winding of 60 turns. The secondary winding is connected to an ammeter with a resistance of 0.15
Q. What is action of points (corona discharge)? What is its use? The seep out of electric charges from the sharp points on the charged conductor is known as action of points o
Kirchhoff's law of radiation (G.R. Kirchhoff): The emissivity of a body is equivalent to its absorptance at the simialr temperature. Kirchhoff's laws (G.R. Kirchhoff)
Inertia with a handkerchief and tumbler Spread a handkerchief out on a smooth table top. Place a tumbler full with water near one corner of the handkerchief. Raise the opposite
In computing the electric field at some point P in the x-y plane of a Cartesian coordinate system due to a linear charge distribution in the x-y plane each contribution to the elec
It is significant to denote the time interval to in which we are talking about average. In a given time interval t 1 to t 2 the average angular acceleration is defined as ,
The magnitude of the force vector F is 270 newtons. They component of this vector is directed along the +y axis and has magnitude of 150 N. The x component is directed along the +x
explain newtons motion law
what is the force?
In the figure below the closed curves A and B represent closed surfaces. What is the total flux by the closed surface A? Ans: In concurrence with Gauss's Law the net o
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