Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 5, Problem 5.6P
Assuming that the blocks are not filled, compute the unit thermal resistance for the partition of problem 5-4.
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i. Calculate the heat loss through the furnace wall (all sides) by using conduction shape factor.
ii. Calculate the heat loss through the furnace wall by using thermal resistance from each side (6 sides).
iii. Determine the percentage difference of heat loss between case (i) and case (ii).
iv. Explain why the heat transfer for both cases are different.
Sputnik 1, the first satellite launched into space by the Russians in 1957, is a 2-shell aluminum alloy (2024-T6) sphere. The highly polished outer shell (seeing deep space) is 585 mm in diameter, and has thickness of 1 mm (ID = 583 mm). The inside shell is 2 mm thick. There is a contact resistance between the two aluminum shells of value Rc"= 200 m2·K/W. Inside the shell, there is a radio unit that is uniformly dissipating thermal energy of Qradio = 1 W. Determine the steady-state temperature on the inner shell’s inner wall (ignore the effects of the antennas).
Hint: You can use a radiation heat transfer coefficient hr = εσTshell3
Presents the diagram of the problem, necessary formulas, clearance and numerical solution:
A metal plate 4 mm thick has a temperature difference between its two faces of 32 ◦C. It transmits 200 kcal/h through an area of 5 cm2. Calculate the thermal conductivity of the metal in W/m K.
Chapter 5 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 5 - Determine the thermal conductivity of 4 in. (100...Ch. 5 - Compute the unit conductance C for 512 in. (140...Ch. 5 - Compute the unit thermal resistance and the...Ch. 5 - What is the unit thermal resistance for an inside...Ch. 5 - Compute the thermal resistance per unit length for...Ch. 5 - Assuming that the blocks are not filled, compute...Ch. 5 - The partition of Problem 5-4 has still air on one...Ch. 5 - The pipe of Problem has water flowing inside with...Ch. 5 - Compute the overall thermal resistance of a wall...Ch. 5 - Compute the overall heat-transfer coefficient for...
Ch. 5 - Estimate what fraction of the heat transfer for a...Ch. 5 - Make a table similar to Table 5-4a showing...Ch. 5 - Estimate the unit thermal resistance for a...Ch. 5 - Refer to Problem 5-13, and estimate the unit...Ch. 5 - A ceiling space is formed by a large flat roof and...Ch. 5 - A wall is 20 ft (6.1 m) wide and 8 ft (2.4 m) high...Ch. 5 - Estimate the heat-transfer rate per square foot...Ch. 5 - A wall exactly like the one described in Table...Ch. 5 - Prob. 5.19PCh. 5 - Compute the overall heat-transfer coefficient for...Ch. 5 - Compute the overall heat transfer for a single...Ch. 5 - Determine the overall heattransfer coefficient for...Ch. 5 - A basement is 2020ft(66m) and 7 ft (2.13 m) below...Ch. 5 - Estimate the overall heat-transfer coefficient for...Ch. 5 - Rework Problem 5-23 assuming that the walls are...Ch. 5 - A heated building is built on a concrete slab with...Ch. 5 - A basement wall extends 6 ft (1.8 m) below grade...Ch. 5 - A 2440ft(7.312.2m) building has a full basement...Ch. 5 - The floor of the basement described in Problem...Ch. 5 - Assume that the ground temperature tg is 40 F (10...Ch. 5 - Use the temperatures given in Problem 5-30 and...Ch. 5 - A small office building is constructed with a...Ch. 5 - A 100 ft length of buried, uninsulated steel pipe...Ch. 5 - Estimate the heat loss from 100 m of buried...Ch. 5 - A large beverage cooler resembles a small building...Ch. 5 - Consider the wall section shown in Fig. 5-10. (a)...Ch. 5 - A building has floor plan dimensions of 3060ft....Ch. 5 - Compute the temperature of the metal roof deck of...Ch. 5 - Consider the wall section shown in Fig. -4a,...Ch. 5 - Consider the knee space shown in Fig. 5-11. The...Ch. 5 - Estimate the temperature in an unheated basement...
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- Calculate the overall heat loss and the temperature profile for each interface if the length of the cylinder is 50 m.Please write your answers legibly.arrow_forwardA furnace wall is to consist in series of 7 in of kaolin firebrick, 6 in of kaolin insulating brick, and sufficientfireclay brick to reduce the heat loss to 100 Btu/ hr ft2 when the face temperatures are 1500 and 100°F,respectively.a) Show the figure of the systemb) What thickness of fireclay brick should be used?c) If an effective air gap of 1/8 in can be incorporated between the fireclay and insulating brick whenerecting the wall without impairing its structural support, what thickness of insulating brick will berequired?arrow_forwardIf the length of the cylinder is 50 m, calculate the overall heat loss and the temperature profile at each interface. Please write the solution legibly.arrow_forward
- In order to reduce the heat loss through a large furnace wall, the decision has been made to add external insulation. Calculate the thickness of insulation required to reduce the heat loss by 75%. Before the change is made, no outer steel shell is used.Data: Refractory brick and wall brick:k = 0.87 W m-1 K-1Insulation: k = 0.090 W m-1 K-1•Steel: k = 43 W m-1 K-1h = 55 W m-1 K-1 (inside furnace).h = 11 W m-1 K-1 (outside furnace).arrow_forwardPlease solve asap, Will provide helpful ratings for complete solution. Thank u A double-glazed window is constructed such that it has 5 mm thick glass as the inside layer, 4 mm layer of gas, and finally 5 mm thick glass as the outer layer. Which have thermal conductivies of 0.7, 2.120, and 5.9 W m-1 K-1, respectively. Calculate the heat loss per unit area, Wm-2 through the glass if the inside temperature of the glass is 11.09 °C and the outside temperature is 6.47 °C Report your answer to 2 decimal places.arrow_forwardCodfish fillets originally at 10 °C are packed to a thickness of 102 mm. Ice is packed on both sides of the fillets and wet-strength paper separates the ice and fillets. The surface temperature of the fish can be assumed as essentially 0 °C. Calculate the time for the center of the fillets to reach 2.22 °C and the temperature at this time at a distance of 25.4 mm from the surface. Also, plot temperature versus position for the slab using a spreadsheet software. The physical properties are k = 0.571 W/m*K, ρ = 1052 kg/m3, and Cp = 4.02 kJ/kg*K. Use Heissler charts to answer this question.arrow_forward
- The cooling load for a house is determined in part by using the same formulaused to find the heat load. The temperature difference used in designing acooling system is 25°F. The corner room shown does not face the sun so noadditional cooling load is required. The windows are single pane, and thewalls are brick veneer with 31⁄2 inches of insulation (R-11). The ceiling has31⁄2 inches of insulation (R-11), and the floor has no insulation. The room isbuilt over a vented crawl space with a vented attic above it. Find the coolingload for this room.arrow_forwardSolve this with diagram: An iron (k=70.2 W/m·K) pipe has an inside diameter of 35 mm and an outside diameter of 43 mm. The pipe carries water at 7°C through surroundings that are at 26°C. The top half of the pipe is insulated with 20mm thick foam insulation which has a thermal conductivity of 0.045 W/m·K. The bottom half of the pipeis not insulated. The convection coefficient on the inside of the pipe is 125 W/m2·K while the coefficient on the outside is 7 W/m2·K and is assumed to be the same for the top and bottom of the configuration. Determine the rate of heat loss from the pipe.arrow_forwardA plane wall is having 160 mm thickness, ‘b’ mm width and its height is three times the width is having a thermal conductivity of 14 W/mK. The surface temperatures are at 2000oK and 400o K. The heat flow across the plane wall is 465 W Calculate the width, height and area of the wall?arrow_forward
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