Engineering, 17.10.2019 00:30 zachthomas024

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. consider a 0.25-m-thick concrete wall (rho= 2300 kg/m3, c= 880 j/kg·k, k= 1.4 w/m·k), which is at an initial temperature of ti= 25°c and irradiated at one surface by lamps that provide a uniform heat flux of qs′′= 0.85·104 w/m2. the absorptivity of the surface to the irradiation is αs= 1.0. if building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°c and 25°c, respectively, after 30 min of heating, will the requirements b

Answers: 2

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk

Answers: 1

Answer

Engineering, 04.07.2019 18:20

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Answers: 1

Answer

Engineering, 04.07.2019 18:20

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?

Answers: 2

Answer

You know the right answer?

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. co...

Questions