Homework Answers
Heat release rate is defined as the rate of heat produced by the fire. And combustion efficiency is defined as how effectively the heat from a fuel is transformed into usable heat, the high the combustion efficiency high will be the heat release rate.
Kerosene fire having 85% combustion efficiency will have high heat release rate in comparison to kerosene fire having 65% of combustion efficiency.
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14. What are the differences in heat release rate for a 5 m diameter kerosene fire...
Show the difference of heat release rates for a 3-m diameter kerosene fire with 45% efficiency vs...
Show the difference of heat release rates for a 3-m diameter kerosene fire with 45% efficiency vs. 70% efficiency.
1. Define heat release rate (HRR) and explain its importance, in your own words. Specifically, what...
1. Define heat release rate (HRR) and explain its importance, in your own words. Specifically, what clements affect the HRR of a single fuel package? What is the mathematical formula for determining the HRR, and what does each element of the equation represent? Write your answers in your own words. Provide all references. Determine the peak HRR of the following items in Review Questions 2-5 (provide refer- ences for your answers): 2. Bunk bed 3. Sofa 4. Mattress 5. Kiosk...
15. If a fire is using 1.7 kg of oxygen per second, what is the heat release rate?
15. If a fire is using 1.7 kg of oxygen per second, what is the heat release rate?
Water flows through a fire hose of diameter 6.35 cm at a rate of 0.0115 m3/s....
Water flows through a fire hose of diameter 6.35 cm at a rate of 0.0115 m3/s. The fire hose ends in a nozzle of inner diameter 2.20 cm. What is the speed with which the water exits the nozzle? ? m/s
P2:30 Kerosene at 96 C and flow rate of 20 kg/s must be cooled to 85...
P2:30 Kerosene at 96 C and flow rate of 20 kg/s must be cooled to 85 C by crude oil at 20 C and flow rate of 20 kg/s. A 211/4 in-ID shell and tube exchanger containing 1-in OD, 13 BWG tubes laid out on a 11/4 inch square pitch is used. The number of tubes are 166 and they are 5 m long. Find the outlet temperatures when the exchanger is new. Route the crude oil through the tubes....
A rotary kiln incinerator is going to have an average energy release rate of 1,000,000 kJ/m²-hr...
A rotary kiln incinerator is going to have an average energy release rate of 1,000,000 kJ/m²-hr in the combustion chamber. It is anticipated that the incinerator will be used to incinerate 2000 kg/hr of solid waste. The heating value (specific energy content) of the waste is 17,000 kJ/kg. The internal diameter of the kiln is 2.5m. Design the size of the incinerator in terms of volume and length.
5. Fire hoses used in major structure fires have inside diameters of 2.5 in. The nozzle of the fire hose have an inside diameter of 1.2 in. When firefighters are fighting a fire 2019.007 cm above...
5. Fire hoses used in major structure fires have inside diameters of 2.5 in. The nozzle of the fire hose have an inside diameter of 1.2 in. When firefighters are fighting a fire 2019.007 cm above the ground, the pressure in the nozzle is less than at ground level. When measured, the gauge pressure in the nozzle is 0.00 Pa. (a) (2p) How are the firefighters able to fight a fire with zero water pressure? Explain your answer (b) (2p)...
Consider a chemical reactor that has a constant heat release. In this reactor, there are 1-m...
Consider a chemical reactor that has a constant heat release. In this reactor, there are 1-m long cylindrical pipes (L) have inner diameter of 25 mm (D) and Helium gas enters each of the pipe at 400K (Ti) and exits at 800K (Te) that is used to cool the reactor at atmospheric pressure and has mass flow rate as 0.02 kg/s. Determine; (Helium properties at Tf; ρ=0.08 kg/m3; Cp=5200 J/kg.K; µ= 32*10-6 kg.m/s ; k=0.23 W/m.K; Pr= 0.72) the surface...
PAGE 2 ME2135/ME2135E QUESTION 1 A centrifugal pump of 0.37 m diameter, is pumping water (of dens...
PAGE 2 ME2135/ME2135E QUESTION 1 A centrifugal pump of 0.37 m diameter, is pumping water (of density 998 kg/m) at 2160 rpm and produces the following performance data (where the symbols used have their usual meaning): Q (m3/s) | 0.0 H (m)105 P (kW) 100 0.05 104 115 0.10 102 135 0.15 0.20 95 202 0.25 85 228 0.30 67 249 100 Determine (a) the best efficiency point (BEP) and (b) the maximum possible discharge estimated from the tabulated performance...
(a) What is the fluid speed (in m/s) in a fire hose with a 8.50 cm...
(a) What is the fluid speed (in m/s) in a fire hose with a 8.50 cm diameter carrying 74.0 L of water per second? m/s (b) What is the flow rate in cubic meters per second? m3/s (c) Would your answers be different if salt water replaced the fresh water in the fire hose? Yes, because the velocity and the flow rate are directly proportional to the fluid's density. No, because the velocity and the flow rate are independent of...
1. Define heat release rate (HRR) and explain its importance, in your own words. Specifically, what clements affect the HRR of a single fuel package? What is the mathematical formula for determining the HRR, and what does each element of the equation represent? Write your answers in your own words. Provide all references. Determine the peak HRR of the following items in Review Questions 2-5 (provide refer- ences for your answers): 2. Bunk bed 3. Sofa 4. Mattress 5. Kiosk...
15. If a fire is using 1.7 kg of oxygen per second, what is the heat release rate?
P2:30 Kerosene at 96 C and flow rate of 20 kg/s must be cooled to 85 C by crude oil at 20 C and flow rate of 20 kg/s. A 211/4 in-ID shell and tube exchanger containing 1-in OD, 13 BWG tubes laid out on a 11/4 inch square pitch is used. The number of tubes are 166 and they are 5 m long. Find the outlet temperatures when the exchanger is new. Route the crude oil through the tubes....
A rotary kiln incinerator is going to have an average energy release rate of 1,000,000 kJ/m²-hr in the combustion chamber. It is anticipated that the incinerator will be used to incinerate 2000 kg/hr of solid waste. The heating value (specific energy content) of the waste is 17,000 kJ/kg. The internal diameter of the kiln is 2.5m. Design the size of the incinerator in terms of volume and length.
5. Fire hoses used in major structure fires have inside diameters of 2.5 in. The nozzle of the fire hose have an inside diameter of 1.2 in. When firefighters are fighting a fire 2019.007 cm above the ground, the pressure in the nozzle is less than at ground level. When measured, the gauge pressure in the nozzle is 0.00 Pa. (a) (2p) How are the firefighters able to fight a fire with zero water pressure? Explain your answer (b) (2p)...
PAGE 2 ME2135/ME2135E QUESTION 1 A centrifugal pump of 0.37 m diameter, is pumping water (of density 998 kg/m) at 2160 rpm and produces the following performance data (where the symbols used have their usual meaning): Q (m3/s) | 0.0 H (m)105 P (kW) 100 0.05 104 115 0.10 102 135 0.15 0.20 95 202 0.25 85 228 0.30 67 249 100 Determine (a) the best efficiency point (BEP) and (b) the maximum possible discharge estimated from the tabulated performance...
(a) What is the fluid speed (in m/s) in a fire hose with a 8.50 cm diameter carrying 74.0 L of water per second? m/s (b) What is the flow rate in cubic meters per second? m3/s (c) Would your answers be different if salt water replaced the fresh water in the fire hose? Yes, because the velocity and the flow rate are directly proportional to the fluid's density. No, because the velocity and the flow rate are independent of...
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