vity of 0.5. Assume the specific heat to remain constant at 600 J/kgK. Use a time step of 30 seconds and an ambient temperature of 20°C. Provide an Excel plot showing the curves of the fire and a steel member through a time of 60 minutes with F/V ratios of: a)25 m-1 b)100 m-1

vity of 0.5. Assume the specific heat to remain constant at 600 J/kgK. Use a time step of 30 seconds and an ambient temperature of 20°C. Provide an Excel plot showing the curves of the fire and a steel member through a time of 60 minutes with F/V ratios of: a)25 m-1 b)100 m-1

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.29P

See similar textbooks

Related questions

Q: ASAP,thx Furnace walls are lined with 3 layers of firebrick with a thickness of 6 in (k=0.95…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 95 cm with…

A: Given: l=0.95m; d=0.65m; t=2.5mm k=157 W/m2K; ambient temperature 20 deg C; h=20 W/mC; and melting…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: Base size of the refrigerator, =0.7 m* 0.7 mHeight of the refrigerator, =1 mInside temperature,…

Q: Hot water at average temperature of 90°C is flowing through a cast iron pipe (k=40 W/mK) whose inner…

Q: A composite wall is formed of a 2.5-cm copper plate (k = 386 W/m.°C), a 3.2-mm layer of 0.038…

A: Note:As per our guidelines we are supposed to answer only one question. Kindly repost other…

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

Q: 36. Aluminium fins (k = 200 W/m.K) of rectangular profile are attached on a plane wall with 5 mm…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

Q: Calculate the hourly heating load of a house in which all exterior surfaces have a thermal…

A: Given Thermal resistance, R = 14 ft2.h.oF/Btu Temperature, T1 = 65oF…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: Given data:- Thickness of aluminium, t=10 mm

Q: For a flat corrugated galvanized steel (conductivity = 26 W/m.K) roof 1/32 in. thick lined with a ¼…

A: Write the expression for thermal transmittance as follows.

Q: An oil radiator has an outside surface area of 0.18 m2 and operates at a surface temperature of 85…

Q: Q1) One end of a copper rod (k = 380 W/m.K), 300 mm long is connected to a wall which is maintained…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 80 cm with…

A: Given: l=0.8m; d=0.7m; t=3mm; k=177 W/m2K; ambient temperature is 25 C; h=20 W/mK; Tb=220 C

Q: QUESTION 44 A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: Base area = 0.7 m x 0.7 m Height = 1 m Ti = 6 C hi= 11.6 W/m2K ho = 14.5 W/m2K

Q: A pipe with an outside diameter of 3.5 in. is insulated with a 3 in. layer of asbestos (ka=0.396…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1m was…

Q: room in a building has dimensions of 5.5 mx 4,5 m x 3.0 m. The room has two external walls and two…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: Given dataAb=0.7×0.7h=1mTi=6°Ctal=10mmtpol=30mmhi=11.6 wm2kho=14.5 wm2kTo find1)individual…

Q: 1ai. a steel bar 10.0 cm long is welded end-to-end to a copper bar 20.0 cm long. Both bars are…

A: Since you have posted a multiple independent question in a single question We will solve first…

Q: 8- One side of a copper block 5 cm thick is maintained at 250 C. The other side is covered with a…

Q: A single-cylinder air-cooled lawn mower engine operates under steady conditions. The cylinder…

A: Given, Surface temperature, Ts=300°CAmbient temperature, T∞=30°CThickness of fin,…

Q: For your company you need to mass produce 20-cmx10-cm heat sinks to dissipate heat quickly from an…

A: Given data, Dimension of the base/sink = 0.2 m×0.1 m Convective heat transfer coefficient of the…

Q: fin made of AL metal with thermal conductivity (199 W / mK). Fin dimensions 3 cm long and 2.5 mm…

A: given data: fin metal : Al : k = 199 W/mK length; l = 0.03 m thickness; t = 2.5 mm wall temperature;…

Q: 2. You have a 2.5 m x 10 m, R- 18 effective wall, that includes a window that is 4 m by 2 m that is…

A: Write the given data. Awall=2.5 m×10 m=25 m2Awindow=4 m×2 m=8 m2hwindow=0.43 W/mK

Q: Calculate the rate of heat loss (in W) through the wall. Follow-up question to Question 1,…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

Q: Calculate the quantity of heat conducted per minute through a duralumin circular disc 119mm diameter…

Q: 32. A bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 150 cm with…

A: Given data: Here, L represents the length, di represents the internal diameter, t represents the…

Q: Numerical Exercise 1. A flat plate is supplied with a constant heat flux of 100 [W/m²] from bottom.…

A: 1. A flat plate is supplied with a constant heat flux of 100 [W/m²] from bottom. The plate has 0.5m²…

Q: .A heat pump design creates a heating effect of 35 kW while using 15 kW of electrical power. he…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: given: The area at base, a = 0.7 x 0.7 m2 the area of vertical surface of refrigerator, A = 0.7 x 1…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: base area = 0.7 x 0.7 m2 height = 1 m Ti = 6 oC Aluminium (k) = 225 W/mK Insulation (k) = 0.028…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 150 cm with…

A: Given: L = 150 cm t = 4 mm Di = 85 cm Do = Di + 2t = 85 + 8 = 93 cm thermal conductivity, k = 167…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

A: inner dimensions = 0.7 m by 0.7 m at the base height = 1 m Ti = 6 ˚C. T two 10-mm-thick layers of…

Q: steel rod (k = 30 W/m degree) 1 cm in diameter and 7 cm long protrudes from a wall which is…

A: Given:K=30 W/mCd=1 cmL=7 cmTb=100°Ch=50 W/m2KT∞=30°C

Q: e The side walls of a refrigerator are made from two thin layers of sheet metal, each 1/8 in. thick,…

A: Given data as per the question The thickness of metal sheet =1/8 in =0.0104 ft The thickness of the…

Q: A domestic refrigerator with inner dimensions of 0,7 m by 0,7 m at the base and height 1m was…

Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…

Q: ist of two 10-mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane…

Q: Mild steel nails were driven through a solid wood wall consisting of two layers, each 15 mm thick,…

Q: A cylindrical can of pea puree has a diameter of 68.1 mm and a height of 101.6 mm. The can is…

A: Given DataT0=29.4°CH=101.6mT1=115.6α=2..007×10-7m2/sDia=68.1mm As Question not mention but this…

Q: A) If you increase cross-sectional area effectiveness will drop B) epsilon is proportional to…

A: Option c is correct none of the above

Q: Composite walls of a building are made of 8 cm of brick [k = 0.69 W/m·°C], 2 cm of Celotex [k =…

Q: QUESTION 1 A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1…

Q: A wall is constructed of 5.0 cm of copper [k = 400 W/m°C] and 5.0 mm of asbestos sheet [k = 0.17…

A: GIVEN DATA For Copper L=5cm K=400 W/m'C For Asbestos L=5mm…

Q: A certain building wall consists of 0.15 m of concrete [K = 0.15W / m * K] 0.15 m of fiber glass…

A: The solution is given below

Question

Build a spreadsheet to do the step by step method for estimating the temperature of unprotected steel work exposed to the ASTM E119 Standard Fire. Assume a convective heat transfer coefficient of 25 W/m²K and an emissivity of 0.5. Assume the specific heat to remain constant at 600 J/kgK. Use a time step of 30 seconds and an ambient temperature of 20°C. Provide an Excel plot showing the curves of the fire and a steel member through a time of 60 minutes with F/V ratios of:

a)25 m^-1

b)100 m^-1

c)200 m^-1

d)300 m^-1

Note your plot should contain 5 curves. One for the fire and one for each of the F/V values.

Also on the spreadsheet, highlight in green, the cells identifying the temperature of the unprotected steel member with an F/V of 200m^-1 at the following times:

a)3 minutes

b)10 minutes

c)20 minutes

d)50 minutes

Expert Solution

This question has been solved!

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

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Similar questions

2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is to be a stainless steel wire having an electrical resistivity of ohm-centimeter. The operating temperature of the stainless steel is to be no more than 1260°C. The heat transfer coefficient at the outer surface is expected to be no less than in a medium whose maximum temperature is 93°C. A transformer capable of delivering current at 9 and 12 V is available. Determine a suitable size for the wire, the current required, and discuss what effect a reduction in the heat transfer coefficient would have. (Hint: Demonstrate first that the temperature drop between the center and the surface of the wire is independent of the wire diameter, and determine its value.)
2.2 A small dam, which is idealized by a large slab 1.2 m thick, is to be completely poured in a short Period of time. The hydration of the concrete results in the equivalent of a distributed source of constant strength of 100 W/m3. If both dam surfaces are at 16°C, determine the maximum temperature to which the concrete will be subjected, assuming steady-state conditions. The thermal conductivity of the wet concrete can be taken as 0.84 W/m K.
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.
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.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
2.15 Suppose that a pipe carrying a hot fluid with an external temperature of and outer radius is to be insulated with an insulation material of thermal conductivity k and outer radius . Show that if the convection heat transfer coefficient on the outside of the insulation is and the environmental temperature is , the addition of insulation actually increases the rate of heat loss if , and the maximum heat loss occurs when . This radius, is often called the critical radius.
Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are those of the air on the left and right sides of the wall and that the convection heat transfer coefficients on the left and right surfaces are 6 and 10W/m2K, respectively.
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.
Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 55
Water at a temperature of 77C is to be evaporated slowly in a vessel. The water is in a low-pressure container surrounded by steam as shown in the sketch below. The steam is condensing at 107C. The overall heat transfer coefficient between the water and the steam is 1100W/m2K. Calculate the surface area of the container that is required to evaporate water at a rate of 0.01 kg/s. Problem 1.16
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.
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.