A Lancashire boiler is 7.5m long, 2m diameter and is half full of water at 30˚C....
A Lancashire boiler is 7.5m long, 2m diameter and is half full of water at 30˚C. Heat is supplied to the boiler at a constant rate of 3MW. Calculate the time taken to raise the temperature of the water to 150˚C if the thermal capacity of the boiler metal is neglected
Homework Answers
Add Answer to:
A Lancashire boiler is 7.5m long, 2m diameter and is half full
of water at 30˚C....
Qn:4 QUESTION 3 105? and applied voltage of water from 15°C to 90°C 3.2 If the...
Qn:4
QUESTION 3 105? and applied voltage of water from 15°C to 90°C 3.2 If the water equivalent of the kettle is 150g, find how long it will take to raise a second itre [10) The heater element of an electric kettle has a constant resistance of of 240V. Calculate time taken to raise the temperature of one litre assuming that only 80% of the power input to-the kettle is usefully employed. 3.1 (5) of water through the same temperature...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
Problem 3 Refer to the schematic below. The boiler is supplied water at 200'C at a...
Problem 3 Refer to the schematic below. The boiler is supplied water at 200'C at a rate of 650,000 kg per hour at 8MPa and heats it to 550 C. The saturated feedwater entering the low-pressure pump is at 7.5KPa. The closed feed water heater operates at 1800KPa and while open feed water heater uses extracted steam at 275KPa. A steam trap delivers saturated water from the closed feed water heater to the open feed water heater. Saturated liquid leaves...
Q2) A long porous cylinder of 30 mm diameter is completely wetted by water at 34°C....
Q2) A long porous cylinder of 30 mm diameter is completely wetted by water at 34°C. Atmospheric air at 20°C and 50% relative humidity flows over the cylinder at a velocity of 20 m/s in a large radiant furnace whose walls are kept at 60°C. a. Find the convective heat and mass transfer coefficients over the porous cylinder, b. Calculate the rate of change of temperature of porous cylinder at the instant it is exposed to above mentioned conditions For...
Refer to the schematic below. The boiler is supplied water at 200˚C at a rate of...
Refer to the schematic below. The boiler is supplied water at
200˚C at a rate of 650,000 kg per hour at 8MPa and heats it to
550˚C. The saturated feedwater entering the low-pressure pump is at
7.5KPa. The closed feed water heater operates at 1800KPa and while
open feed water heater uses extracted steam at 275KPa. A steam trap
delivers saturated water from the closed feed water heater to the
open feed water heater. Saturated liquid leaves the open heater...
Refer to the schematic below. The boiler is supplied water at 200˚C at a rate of...
Refer to the schematic below. The boiler is supplied water at
200˚C at a rate of 650,000 kg per hour at 8MPa and heats it to
550˚C. The saturated feedwater entering the low-pressure pump is at
7.5KPa. The closed feed water heater operates at 1800KPa and while
open feed water heater uses extracted steam at 275KPa. A steam trap
delivers saturated water from the closed feed water heater to the
open feed water heater. Saturated liquid leaves the open heater...
I) Boiler superheater [3 marks) B) A steam boiler fired with oil of calorific value of 42 MJ/kg g...
I) Boiler superheater [3 marks) B) A steam boiler fired with oil of calorific value of 42 MJ/kg generates steam at a rate of 2500 kg/h and 1.5 MPa. The generated steam is further heated in a superheater to a temperature of 300°C. Feed water at 30°c is preheated to 90°C through passage in the economizer. The boiler unit has an efficiency of 78% i) Calculate the fuel/oil consumption rate (in kg/h) ii) Calculate the percentage increase in fuel consumption...
A geothermal aquifer supplies hot water at a temperature of 70 deg C at a flow...
A geothermal aquifer supplies hot water at a temperature of 70 deg C at a flow rate of 10L/s. The hot water is used in a district heating system at a temperature of 40 deg C. It is assumed that all the thermal energy can be transferred through a heat exchanger. The geothermal aquifer is used 150 days each year. Calculate the amount of heat used for heating during the year. Calculate the amount of oil necessary to get the...
Qn:4
QUESTION 3 105? and applied voltage of water from 15°C to 90°C 3.2 If the water equivalent of the kettle is 150g, find how long it will take to raise a second itre [10) The heater element of an electric kettle has a constant resistance of of 240V. Calculate time taken to raise the temperature of one litre assuming that only 80% of the power input to-the kettle is usefully employed. 3.1 (5) of water through the same temperature...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
Problem 3 Refer to the schematic below. The boiler is supplied water at 200'C at a rate of 650,000 kg per hour at 8MPa and heats it to 550 C. The saturated feedwater entering the low-pressure pump is at 7.5KPa. The closed feed water heater operates at 1800KPa and while open feed water heater uses extracted steam at 275KPa. A steam trap delivers saturated water from the closed feed water heater to the open feed water heater. Saturated liquid leaves...
Q2) A long porous cylinder of 30 mm diameter is completely wetted by water at 34°C. Atmospheric air at 20°C and 50% relative humidity flows over the cylinder at a velocity of 20 m/s in a large radiant furnace whose walls are kept at 60°C. a. Find the convective heat and mass transfer coefficients over the porous cylinder, b. Calculate the rate of change of temperature of porous cylinder at the instant it is exposed to above mentioned conditions For...
Refer to the schematic below. The boiler is supplied water at
200˚C at a rate of 650,000 kg per hour at 8MPa and heats it to
550˚C. The saturated feedwater entering the low-pressure pump is at
7.5KPa. The closed feed water heater operates at 1800KPa and while
open feed water heater uses extracted steam at 275KPa. A steam trap
delivers saturated water from the closed feed water heater to the
open feed water heater. Saturated liquid leaves the open heater...
Refer to the schematic below. The boiler is supplied water at
200˚C at a rate of 650,000 kg per hour at 8MPa and heats it to
550˚C. The saturated feedwater entering the low-pressure pump is at
7.5KPa. The closed feed water heater operates at 1800KPa and while
open feed water heater uses extracted steam at 275KPa. A steam trap
delivers saturated water from the closed feed water heater to the
open feed water heater. Saturated liquid leaves the open heater...
I) Boiler superheater [3 marks) B) A steam boiler fired with oil of calorific value of 42 MJ/kg generates steam at a rate of 2500 kg/h and 1.5 MPa. The generated steam is further heated in a superheater to a temperature of 300°C. Feed water at 30°c is preheated to 90°C through passage in the economizer. The boiler unit has an efficiency of 78% i) Calculate the fuel/oil consumption rate (in kg/h) ii) Calculate the percentage increase in fuel consumption...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago