Approximate an egg as a 5.5 cm diameter sphere at 8 C. Find the heat that...
Approximate an egg as a 5.5 cm diameter sphere at 8 C.
Find the heat that must be
transferred to the egg to raise its temperature to 80 C, assuming
that the liquid inside the shell
has ρ = 1020 kg/m3 and cp = cv = 3.32 kJ/kg-K.
Homework Answers
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Approximate an egg as a 5.5 cm diameter sphere at 8 C.
Find the heat that...
One of the industrial process is to heat a vegetable oil to a specific temperature by...
One of the industrial process is to heat a vegetable oil to a specific temperature by passing the oil through a metal coil that is placed in a warm water path. The oil flows in the coil with a mass flow rate of 0.05 kg/s at 20◦C. The coil consists of ten turns with a diameter of 50 cm that is made copper tubing (350 W/m. K) of 1 cm inside diameter with a 2 mm wall thickness. The total...
part B ?? The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following prope...
part B ??
The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following properties: Diameter, D = 1 mm, Density, ρ = 10,000 kg/m3, Specific Heat, Cp-1001/kgK. 5. a. Find the time constant, t b. Would you recommend using this thermocouple to make temperature measurements on a system whose temperature is oscillating at 1 Hz?
The heat transfer to a...
A silver sphere (k = 429 W/m.°C.p = 10,500 kg/m", Cp=0.235 kJ/kg-°C) is initially at 0°C....
A silver sphere (k = 429 W/m.°C.p = 10,500 kg/m", Cp=0.235 kJ/kg-°C) is initially at 0°C. The sphere diameter is 5 cm. Now the sphere is exposed to ambient air at 40°C on all of its surfaces with a heat transfer coefficient of 12 W/ m K. Determine approximately how long it will take for the temperature of sphere to rise to 25°C. Ot=80 min t=28 min O t = 120 min o t= 18 min
The ‘Condensate pre-heater’ shown in the process circuit for the Killingholme combined cycle is a counter...
The ‘Condensate pre-heater’ shown in the process circuit for the Killingholme combined cycle is a counter flow shell and tube heat exchanger heated by a heat transfer oil. In reality this would utilise waste heat from the heat recovery boiler but this has been simplified for the purposes of setting an assessment question, to just using hot oil. The heat transfer oil flows through the tubes and the condensate flows through the shell of the heat exchanger. The oil enters...
A long steel bar with a diameter of 4 cm (ρ = 7840 kg / m3...
A long steel bar with a diameter of 4 cm (ρ = 7840 kg / m3 , cp = 580 J / kg ° K, k = 52 W / mK, α = 1.21x10-5 m2 / s), internal enters the 2 m long moving belt heat treatment furnace at ambient temperature of 900 ° C at 40 ° C. Since the film coefficient in the oven is 100 W / m2K, the center axis temperature of the bar at the...
Required information A shell-and-tube heat exchanger is used for cooling 47 kg/s of a process stream...
Required information A shell-and-tube heat exchanger is used for cooling 47 kg/s of a process stream flowing through the tubes from 160°C to 136°C. This heat exchanger has a total of 100 identical tubes. each with an inside diameter of 2.5 cm and negligible wall thickness. The average properties of the process stream are: p = 950 kg/m”, k = 0.50 W/mK, Cp=3.5 kJ/kg.K, and -20 mPas The coolant stream is water (cp=4.18 kJ/kg K) at a flow rate of...
2. A separation column at a temperature of 100C is subjected for cooling for a certain...
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
A mass of 5.5 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder...
A mass of 5.5 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder at 101.325 kPa. Initially, 2.3 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 21 percent. Determine: a) the initial...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is i...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
How much heat energy must be added to a 6.0-cm-diameter copper sphere to raise its temperature...
How much heat energy must be added to a 6.0-cm-diameter copper sphere to raise its temperature from-50° C to 190° C? Express your answer with the appropriate units. Units
part B ??
The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following properties: Diameter, D = 1 mm, Density, ρ = 10,000 kg/m3, Specific Heat, Cp-1001/kgK. 5. a. Find the time constant, t b. Would you recommend using this thermocouple to make temperature measurements on a system whose temperature is oscillating at 1 Hz?
The heat transfer to a...
A silver sphere (k = 429 W/m.°C.p = 10,500 kg/m", Cp=0.235 kJ/kg-°C) is initially at 0°C. The sphere diameter is 5 cm. Now the sphere is exposed to ambient air at 40°C on all of its surfaces with a heat transfer coefficient of 12 W/ m K. Determine approximately how long it will take for the temperature of sphere to rise to 25°C. Ot=80 min t=28 min O t = 120 min o t= 18 min
Required information A shell-and-tube heat exchanger is used for cooling 47 kg/s of a process stream flowing through the tubes from 160°C to 136°C. This heat exchanger has a total of 100 identical tubes. each with an inside diameter of 2.5 cm and negligible wall thickness. The average properties of the process stream are: p = 950 kg/m”, k = 0.50 W/mK, Cp=3.5 kJ/kg.K, and -20 mPas The coolant stream is water (cp=4.18 kJ/kg K) at a flow rate of...
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
How much heat energy must be added to a 6.0-cm-diameter copper sphere to raise its temperature from-50° C to 190° C? Express your answer with the appropriate units. Units
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