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Problem 12 Room air at 23°C is heated by a 2000 W space heater with a...
A cylindrical electric heater is located at the centre of a room. The heater has an...
A cylindrical electric heater is located at the centre of a room. The heater has an outer diameter of 0.05 m, length of 0.6 m and emmisivity of 0.97. The surface temperature of this heater is maintained at 105 °C. The internal dimension of the room is 5m x 10m x 3m. The inner surface of this room's wall and air inside this room is maintained at 20 °C using an air conditioning system. The heat transfer coefficient between the...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 2...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
A convection space heater sold at Bass Pro Shop advertises 9000 BTU/hr of heating power. The...
A convection space heater sold at Bass Pro Shop advertises 9000 BTU/hr of heating power. The heater works by forcing 40 ft3/min of ambient air past the heating coils, then emitting the heated air to the room, where it mixes with the cold air in the room. Part A) You decide to buy this space heater for your screened porch, and begin using it on a night where the temperature is 54°F and the barometric pressure is 100 kPa. If...
An electric baseboard heater receives 1500 W of electrical power that heats the room air, which...
An electric baseboard heater receives 1500 W of electrical power that heats the room air, which loses the same amount out through the walls and windows. Specify exaclty where entropy is generated in that process.
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown...
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown below. There is an electrical heater with 10 W/m2 heat flux generation between a layer of insulation and 2 cm thick marble exposed to ambient-room air at T-20 °C with h-20 W/m2K. k-0.04 W/mK Marble with a thickness of 2 cm Ts= 10 ℃ outside Ambient-room air at To Electrical heating layer (negligible thickness) of temperature T-? Insulation with a thickness of 5 cm...
Problem 3 A home in a Midwestern city is being heated with a heat pump in...
Problem 3 A home in a Midwestern city is being heated with a heat pump in a winter day where the outside temperature is 5 C. Due to poor insulation, the home loses 800 KW of heat to the outside surroundings. An space heater inside the room generates 150 KW and another 120 KW of heat is generated by all the appliances and people in the room. The home is desired to be maintained at 25°C The heat pump consumes...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
The schematic diagram of a chamber wall with the known properties is Plane A: kn -5...
The schematic diagram of a chamber wall with the known properties is Plane A: kn -5 Wim K, uniform heat generation,4 2000 wim' shown below. Plane B: kn 20 W/m-K, no heat generation Inside air: 40 °C, h,-10 Wm2 K; Outside air: 20 °C, ho= 5 w/m2 K. A tape heater is placed on the outer wall to provide a uniform heat flux of q, to prevent any loss from the wall. Assuming steady-state, ID conduction along x-direction (a) Determine...
Problem : A cryogenic flui d is flowing in a 304 SS pipe. The pipe is...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
Question 1 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m2/s. Air leaves th...
Question 1 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m2/s. Air leaves the coil at 40°C. a) What is the nature of this transformation? Find from the psychrometric chart the required rate of heat addition. n r Tables Vertical wall in wi Horizontal wall in contact with the ground (Hoor of a heated space, buried) all adjoining to an unheated room (garage, sh Wall in contact with the outside Space category contact with...
A cylindrical electric heater is located at the centre of a room. The heater has an outer diameter of 0.05 m, length of 0.6 m and emmisivity of 0.97. The surface temperature of this heater is maintained at 105 °C. The internal dimension of the room is 5m x 10m x 3m. The inner surface of this room's wall and air inside this room is maintained at 20 °C using an air conditioning system. The heat transfer coefficient between the...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown below. There is an electrical heater with 10 W/m2 heat flux generation between a layer of insulation and 2 cm thick marble exposed to ambient-room air at T-20 °C with h-20 W/m2K. k-0.04 W/mK Marble with a thickness of 2 cm Ts= 10 ℃ outside Ambient-room air at To Electrical heating layer (negligible thickness) of temperature T-? Insulation with a thickness of 5 cm...
Problem 3 A home in a Midwestern city is being heated with a heat pump in a winter day where the outside temperature is 5 C. Due to poor insulation, the home loses 800 KW of heat to the outside surroundings. An space heater inside the room generates 150 KW and another 120 KW of heat is generated by all the appliances and people in the room. The home is desired to be maintained at 25°C The heat pump consumes...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
The schematic diagram of a chamber wall with the known properties is Plane A: kn -5 Wim K, uniform heat generation,4 2000 wim' shown below. Plane B: kn 20 W/m-K, no heat generation Inside air: 40 °C, h,-10 Wm2 K; Outside air: 20 °C, ho= 5 w/m2 K. A tape heater is placed on the outer wall to provide a uniform heat flux of q, to prevent any loss from the wall. Assuming steady-state, ID conduction along x-direction (a) Determine...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
Question 1 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m2/s. Air leaves the coil at 40°C. a) What is the nature of this transformation? Find from the psychrometric chart the required rate of heat addition. n r Tables Vertical wall in wi Horizontal wall in contact with the ground (Hoor of a heated space, buried) all adjoining to an unheated room (garage, sh Wall in contact with the outside Space category contact with...
Most questions answered within 3 hours.
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Task 5.2 Numerical Analysis Using Nested Loops (13 pts)
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