In a high ceiling room with a ceiling height of 5.0 m, normal response sprinklers at 68°C (RTI = 150 m/251/2) are installed at 3 m x 4 m grid at the ceiling. Assume a constant fire size at 3 MW, determine the sprinkler actuation time and the temperature and air velocity of the ceiling jet when the sprinkler actuates.

In a high ceiling room with a ceiling height of 5.0 m, normal response sprinklers at 68°C (RTI = 150 m/251/2) are installed at 3 m x 4 m grid at the ceiling. Assume a constant fire size at 3 MW, determine the sprinkler actuation time and the temperature and air velocity of the ceiling jet when the sprinkler actuates.

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.32P

See similar textbooks

Similar questions

Water at 60 deg. F is pumped from a reservoir to the top of a mountain through a 6-in SCH 120 pipe at an average velocity of 12 ft/s. The pipe discharges into the atmosphere at a level 3000 ft above the level in the reservoir. The pipeline itself is 4500 ft. long. If the overall efficiency of the pump and the motor driving it is 70% and the cost of electric energy to the motor is 4 cents per kilowatt-hour, 5. what is the volumetric flow rate in cubic feet / sec? 2.348.193.241.989.81none of the given4.32
In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .
Water at 60 deg. F is pumped from a reservoir to the top of a mountain through a 6-in SCH 120 pipe at an average velocity of 12 ft/s. The pipe discharges into the atmosphere at a level 3000 ft above the level in the reservoir. The pipeline itself is 4500 ft. long. If the overall efficiency of the pump and the motor driving it is 70% and the cost of electric energy to the motor is 4 cents per kilowatt-hour, 2. what is the theoretical power consumption in hp? 373755575557337733none of the given
Water at 20°C is pumped at a constant rate of 9 m3/h from a large reservoir resting on the floor to the open top of an experimental absorption tower. The point of discharge is 5 m above the floor, and friction losses in the 50-mm pipe from the reservoir to the tower amount to 2.5 J/kg. At what height in the reservoir must the water level be kept if the pump can deliver only 0.1 kW?The value of alpha we should use for the kinetic energy term is?
Water at 60 deg. F is pumped from a reservoir to the top of a mountain through a 6-in SCH 120 pipe at an average velocity of 12 ft/s. The pipe discharges into the atmosphere at a level 3000 ft above the level in the reservoir. The pipeline itself is 4500 ft. long. If the overall efficiency of the pump and the motor driving it is 70% and the cost of electric energy to the motor is 4 cents per kilowatt-hour,1. what is the hourly energy cost for pumping this water? $3.21$ 18.32$12.83$81.23$ 32.18$23.81none of the given
Q-2 ) ) A boiler house has natural draught chimney of 20 m height. Flue gases are at temperature of 380°C and ambient temperature is 27°C. Determine the draught in mm of water column for maximum discharge through chimney and also the air supplied per kg of fuel. Ans. [11.77 mm of water, 11.32 kg/kg of fuel
Water at 20 degree C is pumped at a constant rate of 9 m3/h from a large reservoir resting on the floor to the open top of an experimental absorption tower. The point of discharge is 5m above the floor and friction losses in the 50 mm pipe from the reservoir to the tower amount to 2.5 J/Kg. At what height in the reservoir must the water level be kept if the pump can deliver only 0.1 K.W?
find the driving pressure for a stack that has a height of 18 m and carry a hot gas mixture with an average density of 1.2 k/m3. If you know that the total heat rejection by the stack is 1450 KJ and the c, of the hot gas is 1.8 KJ/Kg.K while the hot gas inlet and outlet temperature are 650 K and 500 K respectively. Assume the hot gas pressure as 2.3 bar while the ambient pressure is 1 bar.
A hose of diameter 3 cm is used to drain a very large tank filled with water (=1000 kg/m3). The hose is draped over the side of the tank so the water is siphoned out. If the hose discharge is 1 m below the surface of the water, estimate the discharged mass flow rate in kg/s? A siphon implies a continuous liquid leg from the water in the tank up the siphon at point 2, the highest elevation, and down to the discharge at point 3. Assume that alpha=1, the discharge at point 3 as well as the tank are both open to the atmosphere and shaft work and frictional losses are ignored. 2.Based on your solution, how can you drain the tank faster?
A dam is proposed on a remote stream that measures approximately 25-cm deep by 350-cm wide with an average velocity of 2.2 m/s. If the dam can be constructed so that the free surface above a turbine is 10 m, estimate the maximum power output of an 88 percent efficient turbine. a. 145kW b. 188kW c. 155kW d. 166kW
An end-burning rocket motor has a chamber diameter of 10cm and a nozzle exit diameter of 8cm. The density of the propellant is 1750 kg/m3 and the surface regresses at the rate of 1cm/s. The gases crossing the nozzle exit plane have a pressure of 10 kpa abs and a temperature of 2000 C. the gas constant is 415 j/kg.k. Calculate the gas velocity at the nozzle exit plane in m/s.
Through a duct air enters a fan at 6.3 m/s and an inlet static pressure 2.5 cm of water less than atmospheric pressure. The air leaves the fan through a duct at 11.25 m/s and a discharge static pressure of 7.62 cm of water above the atmospheric pressure. If the specific weight of the air is 1.2 kg/cubic meters and the fan delivers 9.45 cubic meters/sec, what is the fan efficiency when the power input to the fan is 13.75 kW at the coupling