Flat-plate solar collectors are often tilted up toward the sun in order to intercept a greater amount of direct solar radiation, as shown in Figure Q2. The tilt angle from the horizontal also affects the rate of heat loss from the collector. Consider a 2 m (height) and 3 m (width) solar collector that is tilted at an angle 0 from the horizontal. The back side of the absorber is insulated. The absorber plate and the glass cover, which are spaced 2.0 cm from each other, are maintained at temperatures of 75°C and 35°C, respectively. Analyse the solar collector for different angle, 0 = 0°, 20°, and 90° to select which 0 gives the lowest rate of heat loss from the absorber plate by natural convection.

Flat-plate solar collectors are often tilted up toward the sun in order to intercept a greater amount of direct solar radiation, as shown in Figure Q2. The tilt angle from the horizontal also affects the rate of heat loss from the collector. Consider a 2 m (height) and 3 m (width) solar collector that is tilted at an angle 0 from the horizontal. The back side of the absorber is insulated. The absorber plate and the glass cover, which are spaced 2.0 cm from each other, are maintained at temperatures of 75°C and 35°C, respectively. Analyse the solar collector for different angle, 0 = 0°, 20°, and 90° to select which 0 gives the lowest rate of heat loss from the absorber plate by natural convection.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: Thermal comfort in a house is strongly affected by the so called radiation effect,which is due to…

A: Solution: Given Data: Thermal comfort in a house is strongly affected by the so called radiation…

Q: A 3x3m plate at 500 degC is suspended vertically in a very large room. The plate has an emissivity…

A: Introduction: The energy emitted from the surface in relation to the energy radiated from the black…

Q: Liquefied natural gas (LNG) is transported around the globe using ships similar to that shown in…

Q: = 20 mm. The A tube carries hot water across a factory in a tube with outer diameter Do tube surface…

A: Given data:Tube outer diameter (Do) = 20 mm= 0.02 mTube temperature (T1) = 450°C = 723 K…

Q: Two square plates of equal side (10) cm are 15 cm apart. Find view factor F12.

Q: Molten metal at 2000 C is poured using crucible. The liquid metal jet has a diameter of 3 mm with an…

A: To find: which step is wrong in the given steps

Q: Consider a silicon wafer positioned in a furnace that is zone-heated on the top section and cooled…

Q: Liquefied natural gas (LNG) is transported around the globe using ships similar to that shown in…

A: Radius (r) = 20 m polyurethane foam thickness (t) = 30 cm = 0.3 m Tsi = -162 ºC = -162 +273 = 111 K…

Q: A 3x3m plate at 500 degC is suspended vertically in a very large room. The plate has an emissivity…

A: Given:- Plate is suspended vertically in a very large room Length (L) of plate = 3 mwidth (w) of…

Q: You are designing a chamber to contain the radiation emitted by nuclear decay during a fusion…

A: Determine the expression for the temperature distribution in the wall, T(x) based on the given…

Q: A flat-plate collector with one glass cover is placed in horizontal. The absorber plate temperature…

Q: Concentrating collectors X and Y are constructed for heat generation. Both collectors have the same…

A: Write the given data. CF=14ηopt=84.52%TC=141.01 °CT∞=25 °CIX=775.37 W/m2hX=2.92 W/m2°ChY=4.33 W/m2°C

Q: Heat transfer problem.The internal surface area is an enclosure is 50 meter square. The surface is…

Q: 2. (a) Consider a 25-cm-diameter spherical ball at 700 K suspended in air and assume the…

A: Note - As per our guidelines we are supposed to answeronly one question. Kindly repost other…

Q: Two parallel planes measuring 1.2 x 1.2 m apart by a distance of 4 cm. The emissivities of the…

A: Given: The distance between two parallel plates is, d=4 cm. The area of the plate is, A=1.2 m×1.2…

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 4 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

You can neglect radiation at the bottom of the plate; the bottom side of the plate has water flowing underneath it. Often, when dealing with liquids (rather than gases), one can neglect radiation because heat transfer due to convection is so much larger (liquids tend to have higher convection coefficient values than gases).
A composite wall is comprised of two large plates separated by sheets of refractory insulation. In the installation process, the sheets of thickness L = 50 mm and thermal conductivity k = 0.05 W/mK are separated at 1-m intervals by gaps of width w = 10 mm. The hot and cold plates have temperatures and emissivities of T1 = 400 deg C, emissivity1 = 0.85 and T2 = 35 deg C, emissivity2 = 0.5, respectively. Assume that the plates and insulation are diffuse-gray surfaces. %3D Determine the heat loss by radiation through the gap per unit length of the composite wall (normal to the page). Recognizing that the gaps are located on a 1-m spacing, determine what fraction of the total heat loss through the composite wall is due to transfer by radiation through the insulation gap. Hot side Gap w = 10 mm A. 47 W/m, 9.2% T1 = 400°C B. 47 W/m, 10.2% L = 50 mm C. 37 W/m, 10.2% D. 37 W/m, 9.2% T2 = 35°C Cold side 1 m Insulation, k = 0.05 W/m-K
An opaque surface which is insulated at the back side has a total, hemispherical absorptivity a=0.8 for solar radiation and a total, hemispherical emissivity of e=0.2. A solar radiation flux of 800 W/m2 is incident on this surface. The surface is exposed to the ambient air at T 300 K and convective heat transfer coefficient is h=15 W/m2 K. Neglect the sky radiation. • Sketch the heat fluxes received and dissipated by this surface • Estimate the equilibrium temperature of the surface (assume the surface temperature is higher than the ambient air temperature). 1.= 300 K, h-15 W/m*K 800 W/m? a-0.8 , e-0.2
Two very large parallel plates are kept at uniform temperatures T1=800 K and T2=500 K, and have emissivities ε1=0.2 y ε2=0.7, respectively, as shown in the figure. Determine the net rate of radiation heat transfer between the two surfaces per unit surface area of the plates.
A copper ball of 20 cm diameter is kept outside open to sky during summer. The ball is capable of receiving and emitting heat by radiation. Identify the satisfactory conditions from the following to treat the ball as a block body. I) the emissivity and absorptivity of the ball should be equal to one II) the reflectivity and transmissivity of the ball should be equal to zero III) the ball should emit lesser the heat absorbed I only II only I and II only II and III only I, II and III