Solve for the rate of natural convection heat loss from a flat 1-m square, restaurant grill heated to 227⁰C in ambient air at 27⁰C if a) the grilling surface is horizontal facing up c) the grilling surface is horizontal facing down
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Solve for the rate of natural convection heat loss from a flat 1-m square, restaurant grill heated to 227⁰C
in ambient air at 27⁰C if
a) the grilling surface is horizontal facing up
c) the grilling surface is horizontal facing down
Step by step
Solved in 3 steps with 18 images
- The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -15 C and outer wall is at 25 C. Insulator with a thermal conductivity of 0.035 W/(mK) is used to prevent the heat losses from the compartment. The shape is in square form with a side of 1.2 m and unit width into the page. Determine the thickness of the insulator if the compartment heat load is 700 W? a)5 cm b)none c)4.2 cm d)2.4 mm e)9.6 mm[2] A reservoir of hot water kept at 380K is well insulated except for a copper rod with a cross sectional area of 0.25 m? and a length of 0.50 meters. The rod is also well insulated except for its ends and the other end is in a second well insulated reservoir of water held at 280K. a) Determine the rate of heat flow through the copper rod. b) Calculate the temperature at the center of the rod (0.25 meters from either end). Then extend the process to find the temperature at each point 0.1m along the rod. c) Calculate the rate of entropy change at each end of the rod. d) Using your answer for (c), show that the statements "Heat flows spontaneously from high temperature to low temperature." and "Any spontaneous process causes the entropy of the universe to increase." are logically equivalent for situations with heat flow. e) Each reservoir of water holds 1 m of water. With a steady flow established, the power fails so that the heating and cooling of the water ceases. What are the…The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -10 C and outer wall is at 20 C. Insulator with a thermal conductivity of 0.040 W/(mK) is used to prevent the heat losses from the compartment. The shape is in square form with a side of 1.3 m and unit width into the page. Determine the amount of the heat load if the thickness of the insulator is 2 cm? * a)700 W b)312 W c)78 W d)none e)500 W
- om above. ?.. E How does a straw work to allow a person to drink a liquid ? -) How is the change in en triry. defined in thermodynamic B) Drow a diagram illustrating the Brewster's physics couceptsInner diameter 30 cm, outer diameter 40 cm and heat conduction coefficient 20 W / m ∙ a cylindrical pipe with oC Take it. 25 W / m3 uniformly on the pipe wall There is a constant rate of heat generation. Tube inner surface 75 oC and outer surface temperature is 95oC. a) You can get a general correlation all over the world in the pipe (Continuous regime). b) Temperature calculation address from the midpoint of the pipe wall.The inner and outer surface temperatures of a 1-D slab of material, with a thickness of 8.20 mm, are 48.0°C and 6.0°C respectively. Determine the heat flux through the material in units of W/m2 if the material is: a) Pure Aluminum. b) Sand. c) Sulfur.
- A circular profile fin 2.3 cm in diameter and 20 cm in length is constructed of aluminum (k=20 W/m °C) and is fixed to a wall maintained at a temperature of 90 °C. The ambient temperature is 20°C and the heat transfer coefficient per convection is 15 W/m² Obtain the temperature profile and the temperature at the tip of the fin for the following cases:a) Adiabatic finb) Convection heat transfer at the fin endc) Infinite finThe heat flux in an aluminum pan containing boiling water is 5 × 105 W/m2. The temperature of the surface of the pan in contact with boiling water is 119 °C. a) Determine the temperature gradient in the pan on this surface. b) Determine an equation for calculating the temperature of the surface that is not in contact with water as a function of the thickness of the pan. c) What will be the temperature on the surface that is not in contact with water if the thickness of the pan is 1.2 mm? What if it's 4.0 mm? d) Evaluating the results obtained in questions "a", "b" and "c", how does the thickness of the pan influence the temperature gradient?The interior-wall temperature of an annealing oven constructed of firebrick (Missouri) is2552°F, and the exterior-wall temperature is 392°F. If the heat loss is 3600 Btu/(hr)(sq ft),determine the thickness of the wall, in inches. (answer 5.67”)
- Q2) A plate having a thickness of 4.0 mm has an internal heat generation of 100MW/m and a thermal conductivity of 50 W/m'C. One side of the plate is insulated and the other side is maintained at 100 C. Calculate the maximum temperature in the plate.1-) A hot water produced in a facility enters a thin-walled pipe with a diameter of 9 cm and a length of 90 m with a flow rate of 0.7 kg/s at 80 °C. This pipe is covered with a 2 cm thick insulation with a conductivity of 0.03 W/mK. The pipe is in an environment with a convection coefficient of 11 W/m³K and a temperature of 30 °C. Ra Tei R a) Find convection heat transfer coefficient h. b) Find resistances by drawing resistance schematic. c) Find outlet water temperature. d) Determine T1 and T2 temperaturesi) hovzontal pos 80°C air cokulate the rate of heat tr in the cauity per unit depth i) vertical position so'c Calakate the rete of H.T in the air 40'c cwity per cunit depth. Im 25cM