Engineering, 05.03.2020 21:49 rmcarde4432
A photovoltaic panel of dimension 2m×4m is installed on the
roof of a home. The panel is irradiated with a solar flux of GS =700W /m2, oriented normal to
the top panel surface. The absorptivity of the panel to the solar
Irradiation is s =0.83, and the efficiency of conversion of the absorbed flux to electrical power
is P /sGsA =0.553−0.001Tp, where Tp is the panel temperature expressed in Kelvins and A is
the solar panel area. Determine the electric power generated for
a. A still summer day, in which Tsur =T[infinity]=35C, h=100W /m2 â‹…K, and
b. A breezy winter day, for which Tsur =T[infinity]=−15oC, h=30W /m2 ⋅K. The panel Emissivity is 0.90.
Answers: 2
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
Answers: 3
Engineering, 04.07.2019 18:20
Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.
Answers: 3
Engineering, 04.07.2019 19:20
Heat transfer by is the fastest mode of heat transfer that requires no intervening medium. a)-conduction b)-convection c)-radiation d)-conduction and convection
Answers: 1
A photovoltaic panel of dimension 2m×4m is installed on the
roof of a home. The panel i...
roof of a home. The panel i...
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