Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 3, Problem 3.17P
A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is
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Solve for this : An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to?
QUESTION 3:
Warm air is blown over the inner surface of the windshield of an automobile to
defrost ice accumulated on the outer surface. The windshield has a thickness of
5 mm and thermal conductivity of 1.4 W/m-K. The outside ambient temperature is
-10°C and the convection heat transfer coefficient is 200 W/m²-K, while the ambient
temperature inside the automobile is 25°C. Determine the value of the convection
heat transfer coefficient for the warm air blowing over the inner surface of the
windshield necessary to cause the accumulated ice to begin melting.
One side of a copper (401 W/m-oC) block 5 cm thick is maintained at 175 oC, the other side is covered with fiberglass (k = 0.026 W/m-0C) 2.5 cm thick. The outside of the block is maintained at 38 oC, and the total heat flow is 44 kW. Find the overall heat transfer coefficient. (four decimal places for final answer)
Chapter 3 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 3 - Consider a flat plate or a plane wall with a...Ch. 3 - 3.2 High-strength steel is required for use in...Ch. 3 - Prob. 3.3PCh. 3 - 3.5 In a ball-bearing production facility, steel...Ch. 3 - A 0.6-cm diameter mild steel rod at 38C is...Ch. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - 3.9 The heat transfer coefficients for the flow of...Ch. 3 - 3.10 A spherical shell satellite (3-m-OD,...Ch. 3 - Prob. 3.11P
Ch. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - 3.14 A thin-wall cylindrical vessel (1 m in...Ch. 3 - A thin-wall jacketed tank heated by condensing...Ch. 3 - 3.16 A large, 2.54-cm.-thick copper plate is...Ch. 3 - 3.17 A 1.4-kg aluminum household iron has a 500-W...Ch. 3 -
3.28 A long wooden rod at with a 2.5-cm-OD is...Ch. 3 - A mild-steel cylindrical billet 25 cm in diameter...Ch. 3 - Prob. 3.37PCh. 3 -
3.38 An egg, which for the purposes of this...
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- The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m.K) or copper (k = 390 W/m-K). When used to boil water, the surface of the bottom exposed to the water is nominally at 110°C and heat is transferred from the stove to the pan at a rate of 1200 W. What is the temperature of the surface in contact with the stove for each of the two materials? Aluminum: T = i °℃ Copper: T = °℃ iarrow_forwardSolve this with diagram: An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to? Solve it with resistors methodarrow_forwardSolve this with diagram: An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to?arrow_forward
- A furnace is constructed with 20 cm of firebrick (k=1.36 W/m-K), 10 cm of insulating brick (k=0.26 W/m-K), and 20 cm of building brick (k=0.69 W/m-K), the inside surface temperature is 650oC and the outside air temperature is 32oC, the heat loss from the furnace wall is 0.56 kW/m2. Determine the following: A.)The unit convective coefficient for air. B.)The temperature 25 cm in from the outside surface.arrow_forwardH.W. Q: An aluminum pan whose thermal conductivity is 237 W/m-°C has a flat bottom with diameter 20 cm and thickness 0.4 cm. Heat is transferred steadily to boiling water in the pan through its bottom at a rate of 800 W. If the inner surface of the bottom of the pan is at 105°C, determine the temperature of the outer surface of the bottom of the pan. 105°C 0.4 cm Answer: T= 105.43 °C 800 W 7arrow_forwardThe 10-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper (k = 390 W/m-K). When used to boil water, the surface of the bottom exposed to the water is nominally at 110°C and heat is transferred from the stove to the pan at a rate of 900 W. What is the temperature of the surface in contact with the stove for each of the two materials? Aluminum: T = i °C Copper: T = i °Carrow_forward
- A stainless steel alloy has cylindrical shape (k = 25 W/m.oC), diameter is 10 cm and 25 cm long, taken to furnace. The initial temperature is 90 oC, the furnace temperature is 1260 oC and the heat transfer coefficient is h = 100 W/m2.oC. Determine the time required for a stainless steel alloy to reach 830 oC. Take thermal diffusivity (k⁄ρ c = 0.45 × 10−5 m2/s).arrow_forwardA 1-in Sch 40 stainless steel pipe with a thermal conductivity of 45 W/m-K can move 1,000 kg of saturated steam per hour at 150 °C. Refractory material 0.25 inches thick with a thermal conductivity of 0.025 W/m-K insulates the pipe. At a temperature of 25 °C, the pipe is exposed to the outside air. There is a 1135 W/m2 internal heat transfer coefficient.40 W/m2-K is the outside heat transfer coefficient, whereas -K. Suppose that only the radial direction is involved in steady-state heat transfer and that radiation effects are negligible. ✓ Determine how much heat is being lost through these pipes to the environment.a. 399.1 W/mb. 1525.0 W/mc. 618.4 W/md. 1128.7 W/me. none of the above √ How about the insulated pipe's surface temperature?a. 118.5 °Cb. None of the abovec. 101.5 °Cd. 216.3 °Ce. 292.2 °Carrow_forwardA concrete slab of a basement is 11m long, 8m wide and 0.20m thick. During the winter, temperatures are nominally 17C and 10C at the top and bottom surfaces. The concrete has a thermal conductivity of 1.4W/m-K, The basement is heated by a gas furnace operating at an efficiency of 0.90 and natural gas is priced at $0.001/MJ. What is the daily cost of heat loss in dollars?arrow_forward
- 4. A box with total wall area of 0.6m² and wall thickness 3cm is used to cool drinks. The inner and outer surface of the box are 0°C and 50°C respectively. Determine: (i) The rate of heat flow into the box (ii) The total heat flow in one day (iii) The mass of ice melted Take: Thermal conductivity of the box material to be 0.010 W / (m. K) Heat of fusion of ice to be Lf = 3.34 × 105 J /kg 86,400 seconds are in a day. 3. 4500J of heat was absorbed from a Carnot engine from a reservoir at 65OK. The engine did some work, and discards some heat to a sink at 350K. Evaluate: ) The heat that is discarded (ii) The work the engine did (iii) The efficiency of the systemarrow_forwardIn a spherical ball with a diameter of 24 cm (k=45 W/m°C), heat is produced at a uniform rate of 2.6*106 W/m3. Top is open to ice water at 0 °C with a heat transfer coefficient of 1200 W/m2C. Find the temperatures at the center and surface of the ball.arrow_forwardYou are trying to assess the performance of a heat sink with fins. It has straight rectangular profile fins. The fin length is 20 cm. The fins have a thermal conductivity of 280 W/m-K. The average coefficient of the air around the fins is 80 W/m²-K. The thickness of the fins is 1 cm and the width is 2 cm. The temperature of the air is 20°C. The temperature at the base of the fin is 70°C. Find the efficiency and effectiveness of a single fin. 0.51 and 30.9arrow_forward
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