Answered: Calculate the convection heat transfer…

Calculate the convection heat transfer coefficient value on the outer surface of the insulation to ensure that the outer surface temperature does not exceed 40 ° C. Convection coefficient = Answer

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.19P: 1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the...

See similar textbooks

Related questions

Q: There are 3 people in a hemispherical house with an inner radius of 1.8 m, designed for short-term…

Q: Consider steady heat transfer between two large parallel plates at constant temperature…

A: As per the guidelines we will answer the first three subparts for you. for the rest of the subparts…

Q: Hot gas temperature: Cold gas temperature: 1200°C 50°C Convection heat transfer coefficient on the…

A: Given that, Temperature of hot gas, Th=1200 °C,Temperature of cold gas, Tc=50 °C,Convection heat…

Q: A non-insulated steam pipe passes through a room at 30°C. It has an outside diameter and a…

Q: Determine the temperature variation inside the iron plate with a thickness of 1.5 mm,…

Q: HEAT TRANSFER A mild steel steam pipe with an outer diameter of 11.43 cm and inner diameter of…

Q: A 50-meter-long cast iron pipe with a 10-centimeter outside diameter goes through a 288 K…

Q: .5m x 2.5 m double-pane window consists of two 4.5-mm-thick layers of glass (0.75= [d] W/m·K) that…

A: Given data A1glass = A2glass=Agap = 0.52.5 m2 Kglass = 0.75 W/mK Kgap = 0.025 W/mK Lglass =4.5mm…

Q: . Btu/h ft °F) whose inner and outer diameters are 3.5 in. and 4.0 in., respectively, in an…

Q: A steam pipe 50 mm diameter and 2.5 m long has been placed horizontally and exposed to still air at…

Q: 1. A 1000-W iron is left on the iron board with its base exposed to the air at 20°C. The convection…

A: Heat Transfer

Q: The room of a building receives energy from the sun during the day such that the roof temperature…

A: Given : Surface Temp - 65 C Surrounding Temp - 20 C Length - 5 m Angle - 45 To find: Convective…

Q: A 50-meter-long cast iron pipe with a 10-centimeter outside diameter goes through a 288 K…

Q: The 2 m × 1.5 m area of the wall of an industrial furnace burning natural gas is not insulated and…

Q: A solid plate, with a thickness of 15 cm and a thermal conductivity of 80 W/m-K, is being cooled at…

Q: On a multi-layered rectangular wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

Q: A 50-meter-long cast iron pipe with a 10-centimeter outside diameter goes through a 288 K…

Q: 02. An electronic box that consumes 180 W of power is cooled by a fan blowing air into the box…

A: We are supposed to answer only 3 parts, please post remaining parts as a separate question.

Q: Q1 A. 1. When may one expect radiation heat transfer to be important? 2. Name some good conductors…

A: A. 1. Importance of Radiation heat transfer Note :- you have posted multiple questions on…

Q: Determine the resistance (in F-h/BTU) of a hollow cylinder with an inside and outside radius of 2 in…

Q: The room of a dwelling receives energy from the sun during the day. The roof temperature becomes too…

A: Given Data Roof temperature, TR= 65°C Ambient temperature, Ta=20°C Length of the roof, L=5m

Q: If a cylinder with an infinite length of 2 cm in diameter and a heat conduction coefficient of 12.5…

A: Diameter of the cylinder, d=2 cm=0.02 m Conduction coefficient, k=12.5 W/m.K Convection coefficient,…

Q: Steam at 180 0C flows in a circular pipe, which is composed of 3 different materials (A, B and C).…

Q: Consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 W/m-°C) with…

Q: Consider a large 5-cm-thick brass plate (k = 111 W/m·°C) in which heat is generated uniformly at a…

Q: Q1 A composite house wall is constructed from 1.2 cm layer of fiber insulating board, an 8.0 cm…

A: Given Data

Q: Circular fins of uniform cross section, with diameter of 10 mm and length of 50 mm, are attached to…

A: Hello. Since your question has multiple sub-parts, we will solve the first three sub-parts for you.…

Q: A cold-storage room is constructed of an inner layer of 11 mm of pine with thermal conductivity of…

A: Given:- Length of pine(thickness) Lp=11mm=0.011m Length of concrete(thickness) Lc = 75mm=0.075m…

Q: 058 Btu/h · ft · °R). The inner temperature of the insulation is 67°F. The outer temperature of the…

Q: A cold-storage room is constructed of an inner layer of 14 mm of pine with thermal conductivity of…

Q: Which of the followings is the right expression for total resistance of a cylinder that has constant…

A: Which of the followings is the right expression for total resistance of a cylinder that has constant…

Q: A 2.2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover…

Q: An uninsulated 100-mm diameter steam pipe runs for 25-meters inside a room whose walls and air are…

Q: Q1: A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in…

Q: A 0.083-in-diameter electrical wire at 90°F is covered by 0.02-in-thick plastic insulation (k =…

A: Given data: Diameter of electric wire, d = 0.083 in. Thickness of plastic insulation, t = 0.02 in.…

Q: Consider a room with a 1.8-m-high and 2.0-m-wide double-pane window consisting of two 4-mm-thick…

Q: The passenger compartment of a minivan traveling at 60 mph can be modeled as a 3.2-ft-high,…

A: Write the given information. Write the properties of air at 80°F.

Q: A flat wall is exposed to an environmental temperature of 38 oC. The wall is covered with a layer of…

A: Write the given values with suitable variables.

Q: Consider a person standing in a breezy room at 20°C. Determine the total rate of heat transfer from…

A: Given: Room temperature is 20°C. Exposed area of the person is 1.6 m2. Surface temperature of the…

Q: The wall of a house is 4-meter-high and 15 -meter- wide. The wall is constructed with a 9-cm thick…

Q: A large window glass 0.5 cm thick (k= 0.78 W/m K) is exposed to warm air at 25oC, over its inner…

Q: A furnace wall comprises three layers of thickness 250 mm, 100 mm, and 150 mm with thermal…

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

The building is in an environment of 30 ° C. The walls are covered with an insulating layer of 4 cm thickness whose thermal conductivity is 1.8 W / (m K), and the temperature of the inner wall of the insulation is 320 ° C. Wall heat loss to the environment occurs by convection. Calculate the convection heat transfer coefficient value on the outer surface of the insulation to ensure that the outer surface temperature does not exceed 40 ° C.

Convection coefficient = Answer
W / m² ° C.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Given Data:

VIEW

Convection heat transfer coefficient calculation:

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the convection heat transfer coefficient between the outer surface of the container and the air is 6.8 , the temperature of the air is 27°C, and the temperature of the surface of the sphere is –183°C, determine the rate of heat transfer by convection.
A high-speed computer is located in a temperature-controlled room at 26C. When the machine is operating, its internal heat generation rate is estimated to be 800 W. The external surface temperature of the computer is to be maintained below 85C. The heat transfer coefficient for the surface of the computer is estimated to be 10W/m2K. What surface area would be necessary to assure safe operation of this machine? Comment on ways to reduce this area.
The heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with dimensions 0.1m0.5m is determined to be 125 W when the surface of the plate is kept at 30C. What is the average convection heat transfer coefficient between the plate and the air?
1.39 On a cold winter day, the outside wall of a home is exposed to an air temperature of when the inside temperature of the room is at . As a result of this temperature gradient, there is heat loss through the wall to the outside. Consider the convective heat transfer coefficients for the air inside the room and at the outside wall surface to be, respectively, 12.0 and . If the composite room wall is modeled as a plane wall with a thermal resistance per unit area of , determine the temperature at the outer surface of the wall as well as the rate of heat flow through the wall per unit area. If the homeowner were to consider using a fiberglass insulation layer on the inside wall surface for reducing this heat loss by 50%, what is the required thickness of this layer and the outside wall temperature for this case?
1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/m K. Determine the heat loss through the wall, which is 10-m long and 3-m high. Problem 1.1
A cooling system is to be designed for a food storage warehouse for keeping perishable foods cool prior to transportation to grocery stores. The warehouse has an effective surface area of 1860 m2 exposed to an ambient air temperature of 32C. The warehouse wall insulation (k=0.17W/(mK)) is 7.5 cm thick. Determine the rate at which heat must be removed (W) from the warehouse to maintain the food at 4C.
3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.
An electronic device that internally generates 600 mW of heat has a maximum permissible operating temperature of 70C. It is to be cooled in 25C air by attaching aluminum fins with a total surface area of 12cm2. The convection heat transfer coefficient between the fins and the air is 20W/m2K. Estimate the operating temperature when the fins are attached in such a way that (a) there is a contact resistance of approximately 50 K/W between the surface of the device and the fin array and (b) there is no contact resistance (in this case, the construction of the device is more expensive). Comment on the design options.
A steam pipe 200 mm in diameter passes through a large basement room. The temperature of the pipe wall is 500C, while that of the ambient air in the room is 20C. Determine the heat transfer rate by convection and radiation per unit length of steam pipe if the emissivity of the pipe surface is 0.8 and the natural convection heat transfer coefficient has been determined to be 10 W/m2K.
Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.
A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.