Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
expand_more
expand_more
format_list_bulleted
Videos
Question
Chapter 9, Problem 9.94P
To determine
The convection heat transfer rate across the window as a function of pane spacing during winter condition.
The convection heat transfer rate across the window as a function of pane spacing during summer condition.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Estimate the interfacial heat transfer coefficient for evaporation of a thin film of
saturated liquid water at atmospheric pressure. The liquid film rests on a flat, solid
surface to which a constant and uniform heat flux of 150 kW/m? is applied. The
accommodation coefficient may be taken to be 0.05. If the liquid film thickness is 0.2
mm, compare the interfacial vaporization resistance with the conduction resistance
through the liquid film.
3. Consider a hot automotive engine, which can be approximated as a 0.6 m high, 0.3 m
wide, and 0.9 m long rectangular block. The bottom surface of the block is at a temperature
of 90°C and has an emissivity of 0.9. The ambient air is at 23°C, and the road surface is
at 28°C. The fluid properties of air are determined at the film temperature and can be found
in the tables at the end of the tutorial.
a. Determine the rate of heat transfer from the bottom surface of the engine block by
convection and radiation as the car travels at a velocity of 60 km/h.
b. If the temperatures were measured with a thermometer accurate to the nearest 1°C,
what
in the resultant heat
is
the
uncertainty
transfer rate?
(You may ignore the uncertainties when calculating your fluid properties).
c. If the speedometer in the car is accurate to the nearest 2km/h, what is the
uncertainty in the result?
A well-insulated inside room, 6 m wide and 9 m long with a 3 m ceiling height, is to be heated by means of a ceiling panel installation. It is desired to maintain the surface of the floor at a temperature of 27 oC. Determine the necessary ceiling surface temperature to meet this requirement if the floor is to be planed oak, the ceiling is to be painted with an oil paint, and it is estimated that the portion of the heating requirement to be supplied by radiation is 2 500 W. Assume the walls to be nonconducting but reradiating.
Chapter 9 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 9 - The one-dimensional plane wall of Figure 3.1 is of...Ch. 9 - Using the values of density for water in Table...Ch. 9 - Consider an object of Characteristic length 0.01 m...Ch. 9 - To assess the efficacy of different liquids for...Ch. 9 - In many cases, we are concerned with free...Ch. 9 - The heat transfer rate due to free convection from...Ch. 9 - Consider a large vertical plate with a uniform...Ch. 9 - For laminar free convection flow on a vertical...Ch. 9 - Consider an array of vertical rectangular tins,...Ch. 9 - A number of thin plates are to be cooled by...
Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.13PCh. 9 - The plate described in Problem 9.14 has been used...Ch. 9 - Determine the average convection heat transfer...Ch. 9 - Consider a vertical plate of dimension 0.025m0.50m...Ch. 9 - During a winter day, the window of a patio door...Ch. 9 - Prob. 9.20PCh. 9 - A household oven door of 0.5-m height and 0.7-m...Ch. 9 - Consider a vertical, single-pane window of...Ch. 9 - Consider laminar flow about a vertical isothermal...Ch. 9 - Consider the conveyor system described in Problem...Ch. 9 - Prob. 9.25PCh. 9 - Consider an experiment to investigate the...Ch. 9 - The vertical rear window of an automobile is of...Ch. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - Prob. 9.30PCh. 9 - A refrigerator door has a height and width of...Ch. 9 - In the central receiver concept of a solar power...Ch. 9 - Prob. 9.34PCh. 9 - Airflow through a long, 0.2-m-square air...Ch. 9 - Prob. 9.36PCh. 9 - An electrical heater in the form of a horizontal...Ch. 9 - Consider a horizontal 6-mm-thick, 100-mm-long...Ch. 9 - Prob. 9.39PCh. 9 - Prob. 9.40PCh. 9 - Prob. 9.41PCh. 9 - Many laptop computers are equipped with thermal...Ch. 9 - Prob. 9.43PCh. 9 - At the end of its manufacturing process, a silicon...Ch. 9 - Integrated circuit (IC) boards are stacked within...Ch. 9 - Prob. 9.48PCh. 9 - Prob. 9.50PCh. 9 - Prob. 9.51PCh. 9 - Prob. 9.52PCh. 9 - Prob. 9.53PCh. 9 - Prob. 9.54PCh. 9 - Prob. 9.55PCh. 9 - Prob. 9.56PCh. 9 - Prob. 9.57PCh. 9 - A horizontal tube of 12.5-mm diameter with an...Ch. 9 - Prob. 9.60PCh. 9 - Prob. 9.61PCh. 9 - Prob. 9.63PCh. 9 - Prob. 9.64PCh. 9 - Common practice in chemical processing plants is...Ch. 9 - Consider the electrical heater of Problem 7.49. If...Ch. 9 - Prob. 9.67PCh. 9 - A billet of stainless steel, AISI 316, with a...Ch. 9 - Lone stainless steel rods of 50-mm diameter are...Ch. 9 - Hot air flows from a furnace through a...Ch. 9 - A biological fluid moves at a flow rate of...Ch. 9 - A sphere of 25-mm diameter contains an embedded...Ch. 9 - Prob. 9.79PCh. 9 - A vertical array of circuit boards is immersed in...Ch. 9 - Prob. 9.81PCh. 9 - The front door of a dishwasher of width 580 mm has...Ch. 9 - A natural convection air healer consists of an...Ch. 9 - A bank of drying ovens is mounted on a rack in a...Ch. 9 - Prob. 9.85PCh. 9 - Prob. 9.86PCh. 9 - Prob. 9.87PCh. 9 - To reduce heat losses, a horizontal rectangular...Ch. 9 - Prob. 9.89PCh. 9 - Prob. 9.90PCh. 9 - Prob. 9.91PCh. 9 - Prob. 9.92PCh. 9 - A 50-mm-thick air gap separates two horizontal...Ch. 9 - Prob. 9.94PCh. 9 - A vertical, double-pane window, which is 1 m on a...Ch. 9 - The top surface (0.5m0.5m) of an oven is 60°C for...Ch. 9 - Prob. 9.97PCh. 9 - Prob. 9.98PCh. 9 - Consider the cylindrical. 0.12-m-diamter radiation...Ch. 9 - Prob. 9.100PCh. 9 - A solar collector design consists of an inner tube...Ch. 9 - Prob. 9.104PCh. 9 - Prob. 9.105PCh. 9 - Liquid nitrogen is stored in a thin-walled...Ch. 9 - Prob. 9.108PCh. 9 - Prob. 9.109PCh. 9 - Prob. 9.110PCh. 9 - Prob. 9.111PCh. 9 - Prob. 9.114PCh. 9 - Prob. 9.115PCh. 9 - Prob. 9.116PCh. 9 - Prob. 9.117PCh. 9 - A water bath is used to maintain canisters...Ch. 9 - On a very Still morning, the surface temperature...Ch. 9 - Fuel cells similar to the PEM cell of Example 1.5...
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
- (B) Explain the difference between forced and free convectionarrow_forwardExperiment No. (5) Heat Transfer, Power Input and Surface temperature Questions and Discussions 1. What is the difference between natural and forced convection heat transfer? 2. What sources of error are there in this experiment? 3. Mention the parameters you utilized during the calculation and discuss them briefly. 4. In what functions does Nusselt number in natural convection differ from forced convection, Discuss. 5. Give two examples of natural convection heat transfer. 6. In natural convetion, what makes the hot part of fluid to move?arrow_forwardThermal energy generated by the electrical resistance of a 5-mm-diameter and 4-m- long bare cable is dissipated to the surrounding air at 80°C. The voltage drop and the electric current across the cable in steady operation are measured to be 18 V and 5 A, respectively. Disregarding radiation, estimate the surface temperature of the cable. Evaluate air properties at a film temperature of 100°C and 1 atm pressure.arrow_forward
- The production line of a special biscuit at 30 ̊C and 1 atm has a 0.8 X 0.8 (m) square plate. One side of the plate is maintained at a temperature of 100 ̊C, while the other side is insulated. Determine the rate of heat transfer from the plate by natural convection if the plate (i) Is horizontal with the hot surface facing down; (ii) Is horizontal with the hot surface facing up; Data: The properties of air at the film temperature are: thermal conductivity, k= 0.0279 W/m.k); kinematic viscosity= 1.815 x 10-5 m2/s; Pr = 0.709arrow_forwardPlease solve ASAParrow_forwardI need answer within 20 minutes please please with my best wishesarrow_forward
- Prarrow_forwardFor the Convective Heat Transfer experiment, describe the difference in the procedures: Natural or FreeConvection and Forced convection. What makes the FORCED convection experiment as FORCED? Explain which, in your consideration should give the higher heat transfer rate? And REASON why? Did your results support your consideration?arrow_forwardIf we neglect radiative heat transfer, what is the appropriate heat transfer coefficient value for stagnant ambient air?arrow_forward
- The wear resistance of a steel gear is to be improved by hardening its surface. This is tobe accomplished by increasing the carbon content within an outer surface layer as a result ofcarbon diffusion into the steel; the carbon is to be supplied from an external carbon-rich gaseousatmosphere at an elevated and constant temperature. The initial carbon content of the steel is0.20 wt%, whereas the surface concentration is to be maintained at 1.00 wt%. For this treatmentto be effective, a carbon content of 0.60 wt% must be established at a position 0.75 mm belowthe surface.Specify an appropriate heat treatment in terms of temperature and time for temperaturesbetween 900 0C and 1050 0C (you may select any 3 temperatures). For the diffusion of carbonin steel, D0 = 2.3 x 10-5 m2 /s, Q = 148 kJ/mol. (The error function values are given below)arrow_forwardDifferentiate between free and forced convection with examples.arrow_forwardQuestion No. 1 Gaseous carbon dioxide at 1 atm and 300°C is flowing inside a horizontal pipe that has 5.3 cm ID and 6.0 cm OD. The flow velocity of carbon dioxide is 15 m/s. The outside surface of the pipe is exposed to the atmospheric air that has temperature of 40°C. Considering free convection conditions at the outer pipe surface and assuming pipe wall temperature as 200°C, calculate the inside overall heat transfer coefficient, outside heat transfer coefficient, and overall heat transfer coefficient based on the inside surface of the pipe. Warning: Calculate both the inside and the outside heat transfer coefficients only using the respective correlations and ignore radiation effects.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license