subject
Engineering, 15.04.2020 03:50 KillerMDFK7992

A photovoltaic panel of dimensions 6 m x 5 m is located on top of the roof of a house. Solar irradiation Gs = 900 W/m² is incident on the panel. The panel has an absorptivity to solar irradiation, αₛ of 0.92. The freestream air temperature is Tɪɴꜰ and the surrounding temperature for radiation exchange with the sky is Tsᴜʀʀ. For this particular problem, it is given that Tɪɴꜰ = Tsᴜʀʀ. The convective heat transfer coefficient of air blowing over the panel is h W/m²-K.
The generated electric power is provided by the following expression:
Pᴇʟᴇᴄ = αₛ Gₛ Aᴘ*(A-B*Tᴘ),
where A = 0.61 and B = 0.0014 K⁻¹. The emissivity of the panel and its absorptivity to radiation in the wavelength range of the sky temperature are both equal to 0.7. In the above equation, Aᴘ is the solar panel area and Tᴘ is the panel temperature.
Heat conduction from the panel supports to the roof can be neglected, and so can the heat loss from the back side of the solar panel.
(1) Derive an expression for electrical power generated by the panel as a function of other known quantities.
(2) Plot the electrical power produced as a function of convective heat transfer coefficient h for a fixed air temperature of Tinf = 22 °C over a range of h from 20 to 40 W/m²-K. Provide appropriate reasoning to support the observed trend.
For (2), neglect irradiation from the surroundings. On the same graph as in (2), plot the new electrical power generated as a function of h. Does the electrical power produced change substantially? Comment on why or why not.

ansver
Answers: 3

Other questions on the subject: Engineering

image
Engineering, 04.07.2019 18:10, aaliyah80
The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false
Answers: 1
image
Engineering, 04.07.2019 18:10, michellerosas
Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.
Answers: 3
image
Engineering, 06.07.2019 02:30, heavenwagner
A12 mm diameter shaft runs in a plain cylindrical bush 30 mm long that is located in an 18 mm diameter hole in a housing. the shaft-inner bush fit is h8 f and the outer bush-housing fit is h7-p6. make a fully cimensioned sketch of the bush with tolerances. find the maximum and minimum clearance or interference for both fits on the inner and outer diameters of the bush
Answers: 3
image
Engineering, 06.07.2019 02:30, cofran
A75mm diameter shaft is supported in a journal bearing 75mm long with a diametral clearance of 0. 1mm. it supports a radial load of 1000 n and is lubricated with sae 50 oil at 70°c. find the friction torque and the power loss when the crankshaft rotates at 2900 rev/min.
Answers: 1
You know the right answer?
A photovoltaic panel of dimensions 6 m x 5 m is located on top of the roof of a house. Solar irradia...

Questions in other subjects:

Konu
Physics, 18.09.2019 16:40
Konu
History, 18.09.2019 16:40
Konu
Biology, 18.09.2019 16:40