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 5.20P
Compute the overall heat-transfer coefficient for a
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A hook (Figure 7-27) for hoisting containersof ore in a mine is to be designed using a nonferrous (not based on iron) material. (A nonferrous material is used because iron and steelcould cause a spark that would ignite explosivegases in the mine.) The hook must support aload of 25,000 pounds, and a factor of safety of 2should be used. We have determined that thecross-section labeled ‘‘?’’ is the most criticalarea; the rest of the device is already well overdesigned. Determine the design requirements forthis device and, based on the mechanical property data given on the table design the hook and select an economical material for the hook.
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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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- 5 An inexperienced welder has welded a structural beam together and cooled it rapidly under water. This has caused the grain structure to become brittle. The beam will be used in the construction of a building. Which heat treatment method would be best to make the weld suitable for its purpose? (A) Heat the weld to 700 degrees Celsius and allow to cool slowly. (B) Heat to around 600-650 and hold for an hour then allow to cool slowly. (C) Heating to 300 degrees Celsius and let cool. (D) Reheat the weld to below the austenitic range and quench under water.arrow_forward4. As shown in Figure 13, the top cover of the quenching furnace is lifted by a single acting cylinder, the load on the piston rod is 9kg, the known stroke of the top cover is 250mm, the piston area is 2cm, and the flow rate of the pump is 3L/min. Please calculate the following values: load pressure, forward stroke speed and time. Figure 13arrow_forwardDesign an efficient riser system for thecasting shown in Figure 9-31. Be sure toinclude a sketch of the system, along withappropriate dimensions.arrow_forward
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- 3. The starting length of a shaft is 25.00 mm. This shaft is to be inserted into a hole in an expansion fit assembly operation. To be readily inserted, the shaft must be reduced in length by cooling. Determine the temperature to which the shaft must be reduced from room temperature (20° C) in order to reduce its length to 24.98 mm. Refer to the Table below.arrow_forwardProblem You are tasked with analyzing the frame of a bubble fuselage. The frame is 3D printed using PLA material and must be capable of supporting a 22.05 lb load placed within the cabin space, with the direction of the load indicating the direction of deformation. You will need to perform a series of calculations and analyses to ensure that the design meets strength and safety requirements. Data: Frame Dimensions: A blueprint is provided specifying the dimensions and geometry of the bubble fuselage frame. The thickness of the frame its 0.5 inch. Material: The frame will be 3D printed in PLA material. The material properties of PLA are as follows: Young's Modulus (E): 595669.99 Psi. Yield Strength (σy): 9094.01119 Psi. Density (ρ): 10.04515912 lb/in³ Load: A 22.05 lb load will be applied within the cabin space, with the load direction indicating the direction of deformation Tasks to Perform:( Remmember present the solution process with equations, procedure and results; use…arrow_forward1arrow_forward
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