1. The wall of a refrigerated van is made of steel sheet, glass wool and plywood....
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
1. The wall of a refrigerated van is made of steel sheet, glass wool and plywood. The outer surface is made up of Ls = 5mm steel sheet (Ks=25 W/mK) and the inner surface is made up of Lp=15mm plywood (Kp=0.05 W/mK). Glass wool (LG=25mm, KG=0.01 W/mK) is placed between the inner and outer surface. The temperature of the cold environment inside the van is Ti=-20C, while the outside surface is exposed to To=-30C. The average values of convective heat transfer coefficients at the inner and outer surfaces of the wall are 12 W/mK and 20 W/mK respectively. The surface area of the wall is 0.85m. Determine (a) The individual components of the thermal resistance to heat flow (b) The rate of heat flow through the wall. (c) The temperatures at (i) the outer surface of the wall, (ii) the interface between steel sheet and glass wool, (ii) the interface between glass wool and plywood, and (iv) the inner surface of the wall (40 Points) Ta Steel sheet Glass wool Plywood kp kG ks T Fluid film at the outer surface Fluid film at the inner surface 2. A 1.5m long electrical resistance wire with diameter 4mm has a measured voltage drop of 25V for a current flow of 40A. The thermal conductivity of the wire material is 24 W/(m.K). Determine (a) the rate of generation of thermal energy per unit volume within the wire (b) the maximum temperature in the wire if the surface temperature is kept at 600K. (30 Points) 3. A 2m high and 1m wide plate with thickness 0.3m has one of its sides maintained at 450K while the other is maintained at 350K. The thermal conductivity of the plate can be assumed to vary linearly in that temperature range as K(T) = K(1+ T) where Ko= 18W/mK and = 8.7X104 K-. Assuming 1-dimensional heat transfer and no edge effect, determine the rate of heat conduction through the plate. (30 points) 1. The wall of a refrigerated van is made of steel sheet, glass wool and plywood. The outer surface is made up of Ls = 5mm steel sheet (Ks=25 W/mK) and the inner surface is made up of Lp=15mm plywood (Kp=0.05 W/mK). Glass wool (LG=25mm, KG=0.01 W/mK) is placed between the inner and outer surface. The temperature of the cold environment inside the van is Ti=-20C, while the outside surface is exposed to To=-30C. The average values of convective heat transfer coefficients at the inner and outer surfaces of the wall are 12 W/mK and 20 W/mK respectively. The surface area of the wall is 0.85m. Determine (a) The individual components of the thermal resistance to heat flow (b) The rate of heat flow through the wall. (c) The temperatures at (i) the outer surface of the wall, (ii) the interface between steel sheet and glass wool, (ii) the interface between glass wool and plywood, and (iv) the inner surface of the wall (40 Points) Ta Steel sheet Glass wool Plywood kp kG ks T Fluid film at the outer surface Fluid film at the inner surface 2. A 1.5m long electrical resistance wire with diameter 4mm has a measured voltage drop of 25V for a current flow of 40A. The thermal conductivity of the wire material is 24 W/(m.K). Determine (a) the rate of generation of thermal energy per unit volume within the wire (b) the maximum temperature in the wire if the surface temperature is kept at 600K. (30 Points) 3. A 2m high and 1m wide plate with thickness 0.3m has one of its sides maintained at 450K while the other is maintained at 350K. The thermal conductivity of the plate can be assumed to vary linearly in that temperature range as K(T) = K(1+ T) where Ko= 18W/mK and = 8.7X104 K-. Assuming 1-dimensional heat transfer and no edge effect, determine the rate of heat conduction through the plate. (30 points)
Expert Answer:
Related Book For
Fundamentals of Thermal-Fluid Sciences
ISBN: 978-0078027680
5th edition
Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala
Posted Date:
Students also viewed these mechanical engineering questions
-
Which marketing communication tool is most effective between Daraz and Pickaboo e commerce site and why?Make a list describing all the different marketing communication tools in detail you see being...
-
2. Steam power plant (a) The boiler of a power plant operates at a maximum temperature of 750oC. The condenser of the power plant draws in cooling water at 20oC. What is the theoretical maximum...
-
Jake needed a summer job and was lucky enough to land a position as a ticket collector at a local amusement park. On his first day, he was assigned to work alongside Tim who had worked at the park...
-
Lyon Center began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Instructions (a) Determine the ending inventory under a...
-
(a) Find the Laplace transform of the voltage shown in Fig. 16.52(a). (b) Using that value of vs (t) in the circuit shown in Fig. 16.52(b), find the value of v0 (t). v,(0) 3 V 0 1s al 112
-
Why is a distinction made between conventional accounting and ecological accounting?
-
The Big Bang Theory, a situation comedy featuring Johnny Galecki, Jim Parsons, and Kaley Cuoco, is one of the most watched programs on network television. The first two episodes for the 2011-2012...
-
Presented below is information related to Ayayai Inc. Cost Retail Inventory, 12/31/25 $246,200 $394,300 Purchases 951,116 1,478,700 Purchase returns 60,000 80,300 Purchase discounts 18,300 Gross...
-
A magpie started from rest and flew in a straight line for 3 3 . 3 s during which it traveled 1 2 6 . 8 m . Determine the magpie's acceleration ( assume it was constant ) and how fast it was going...
-
Explore the integration of virtual networking technologies such as Software-Defined Networking (SDN) with virtualized environments. How does SDN enhance network flexibility and management in...
-
The Unit 2 Assignment should respond substantively to the prompt below. The answers should reflect your own thought and not just repeat what is found in the readings. The essays should be...
-
Assume Spindrift Beverage Co. manufactures two products, flavored water and carbonated water, both on the same assembly lines and packaged 30 cans per pack. The predicted sales are 150,000 packs of...
-
Critical reflection about Land Titles & Boundaries of land Here are some questions that might guide your thinking: In preparing for or answering each of the workshop discussion questions, what most...
-
Compare and contrast containerization technologies (e.g., Docker, Kubernetes) with traditional virtualization approaches. What are the key differences in terms of resource isolation, performance, and...
-
consider the truss system, support b is settled downward for 10 mm. EI = constant, a.determine the displacement and rotation at b.the reaction force 2 m 2 m
-
What steps must a business take to implement a program of social responsibility?
-
Consider the flow of saturated steam at 270.1 kPa that flows through the shell side of a shell-and-tube heat exchanger while the water flows through 4 tubes of diameter 1.25 cm at a rate of 0.25 kg/s...
-
Repeat Prob. 2028 assuming the circuit board to be positioned horizontally with (a) chips facing up and (b) chips facing down. Repeat Prob. 2028 A 50-cm 50-cm circuit board that contains 121 square...
-
Using a timer (or watch) and a thermometer, conduct the following experiment to determine the rate of heat gain of your refrigerator. First make sure that the door of the refrigerator is not opened...
-
What do you think are the implementation issues for the AnyUnit BO, when used in the Temptation stable analysis pattern?
-
Identify a few advantages of stable model over traditional model that are not discussed in this chapter.
-
Illustrate with a class diagram and describe the applicability of the temptation SAP in a scenario, where a YouTube channel is trying to tempt people to come and watch the uploaded videos.
Study smarter with the SolutionInn App