1.Consider a flat plate solar collector placed horizontallyon the flat roof of a house. The collector is 5 ft wideTy50°Fskyand 15 ft long, and the average temperature of theSolar collector70°Fexposed surface of the collector is 100'F. Theemissivity of the exposed surface of the collector is0.9. Determine the rate of heat loss from the collectorby convection and radiation during a calm day whenthe ambient air temperature is 70°F and the effectivesky temperature for radiation exchange is 50°F. Takethe convection heat transfer coefficient on theexposed surface to be 2.5 Btu/h ft2. F

Answered: 1. Consider a flat plate solar…

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

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Consider steady heat transfer between two large parallel plates at constant temperatures T1 = 300 K and T2 = 200 K that are L = 1 cm apart, as shown below. Assuming the surface to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is free flowing air with h = 7.5 W/m2oC
A 1.2 m wide and 5.1 m long solar collector is mounted to a roof. Now the average surface temperature of the solar collector is measured to be 50 oC. The effective surrounding sky temperature is 8 oC. If the emissivity of the collector is 0.88, determine the rate of heat transfer from the collector to the surroundings due to radiation.
a certain body at 20 C is display on a top of a building during the night. the body sees nothing but the sky which has effective temperature of 110 k. determine the heat transfer rate from the body to the sky if the body temperature is maintained at 23 C. the surface to the sky emissivity of the body is equal to 0.92
Consider a very thin plate that is mounted and attached on a horizontal board. The plate is subject to an infrared lamp providing a uniform thermal radiation of 2000 W/m?. The plate absorbs 80% of the infrared irradiation and has an emissivity of 0.498. The plate is also exposed to an airflow of temperature of 20 °C and large surroundings with a temperature of 30 °C. The surface area of the plate is 1 m2 and it's surface temperature is measured to be at 104 °C. Required: Draw a clear and consistent schematic of the problem and label the operating conditions on the schematic. Perform systematic analysis, state your assumptions and justify the equation used and determine the convection heat transfer coefficient of airflow. (circle your final answer)
Question 4:Consider a person standing in a room maintained at20°C at all times. The inner surfaces of the walls, floors, and ceiling of the house are observed to be at an average temperature of 12°C in winter and 23°C in summer. Determine threats of radiation heat transfer between this person and the surrounding surfaces in both summer and winter if the exposed surface area, emissivity, and the average outer surface temperature of the person are 1.6 m2, 0.95, and 32°C, respectively.
Consider a 0.6-m × 0.6-m thin square plate in a room at 30°C. Both sides of the plate are maintained at a temperature of 90°C. Determine the rate of heat transfer from the plate by natural convection if the plate is (a) vertical and (b) horizontal. (c) If the plate surface with an emissivity of ε= 0.6, also loses heat by radiation to the room walls at 30°C, can radiation loss be neglected?
An exactly same problem is already solved on bartl*by.Take reference from there.
The door of an oven in the kitchen of a house is 0.5 m high and 0.7 m wide. When the oven is operating, the outside temperature of the door reaches 32°C. Calculate the heat transfer from the oven door towards the room at 22°C, taking into account the effects of radiation. The emissivity of the oven door is 1 and the walls of the kitchen are at 22°C. (σ = 5.67 x 10-8 W/m 2K4 , g = 9.81 m/s2 ) NOTE: More precise values for weather characteristics can be obtained from resources on the internet. Also indicate the source you received.
2. Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 295 K and T2 = 155 K that are L = 2 cm apart. Assuming the surfaces to be black, determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air,(k = 0.01979 W/m- o C) (b) evacuated,(c) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m · °C.
Consider a cylindrical tank with a surface temperature of 44°C which contains water. The height of the tank is 1.1 m and its diameter is 0.4 m. The tank is in a room at 20°C. If the surrounding temperature is also at 20°C, calculate the total rate of heat transfer from all surfaces of the tank by natural convection and radiation. Consider the emissivity to be 0.4. Assumptions: 1 Steady operating conditions exist. 2 Air is an ideal gas. 3 The local atmospheric pressure is 1 atm. Note. Report your solution step by step and clearly.

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