Describe how the 1st and 2nd laws of thermodynamics relates heating and cooling a room. The...
Describe how the 1st and 2nd laws of thermodynamics relates heating and cooling a room.
The methods of heat transfer in a room are conduction, convention, and radiation.
Homework Answers
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Describe how the 1st and 2nd laws of thermodynamics
relates heating and cooling a room.
The...
a.) If T2 is 299.15 K, T1 is 292.95 K, the area of the room is...
a.) If T2 is 299.15 K, T1 is 292.95 K, the area of the room is 3.75 m^2, thermal conductivity (k) is 1.04, and the thickness of the wall is .283 m. what is the rate of conduction? b.) If T2 is 299.15 K, T1 is 292.95 K, the mass of the room is 12.01 kg, specific heat is 1000 J/kg˚C. what is the rate of convection? c.) if If T2 is 299.15 K, T1 is 292.95 K, the rate...
asapp 2nd wall has a al Steady state heat transfer thru a 3 layered wall. 1st...
asapp
2nd wall has a al Steady state heat transfer thru a 3 layered wall. 1st wall has a AT-20 C wall has a AT = 10 C. How are the different wall resistances related? In the question above, which is the controlling resistance? in lumped analysis, which has the greater resistance? a) conduction inside b) surroundings outside
Thermodynamics A 29-L electrical radiator containing heating oil is placed in a 41-m3 room. Both the...
Thermodynamics
A 29-L electrical radiator containing heating oil is placed in a 41-m3 room. Both the room and the oil in the radiator are initially at 10°C. The radiator, with a rating of 1.8 kW, is now turned on. At the same time, heat is lost from the room at an average rate of 0.35 kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 50°C for the oil in the...
1.23 Under conditions for which the same room tempera- ture is maintained by a heating or...
1.23 Under conditions for which the same room tempera- ture is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the win- ter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calcu- lations) by considering a room whose air temperature is maintained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the summer and winter, respectively....
You are in a closed crowded room with a lot of other people. In all likelihood...
You are in a closed crowded room with a lot of other people. In all likelihood you will start getting very hot and actually begin sweating. Describe what is happening thermodynamically to you and to the room. Make sure you describe your control boundary or control volume. List all assumptions including initial temperatures, pressures, etc. You need to discuss what is happening thermodynamically by referencing the 1st and 2nd Laws of Thermodynamics. Pv and Ts diagrams may be helpful in...
Sphere is made of Silver. The air is still so Heat transfer would be Free Convection A sphere of silver of 30 mm diameter is cooling suspended in still air at room temperature of 27°C. If the initial...
Sphere is made of Silver. The air is still so Heat transfer
would be Free Convection
A sphere of silver of 30 mm diameter is cooling suspended in still air at room temperature of 27°C. If the initial temperature of the sphere is 127°C, what will be its center temperature after 15 minutes? Ignore the radiation effects
A sphere of silver of 30 mm diameter is cooling suspended in still air at room temperature of 27°C. If the initial temperature...
Two-Dimensional Steady and Transient Conduction - Cooling a very large scale microelectronic chip, A simplified representation...
Two-Dimensional Steady and Transient Conduction - Cooling a very
large scale microelectronic chip,
A simplified
representation for cooling in very large-scale integration (VLSI)
of microelectronics is shown in the sketch below. A silicon chip is
mounted in a dielectric substrate, and one surface of the system is
convectively cooled, while the reminding surfaces are well
insulated from the surrounding. The problem is rendered two
dimensional by assuming the system to be very large in the
direction perpendicular to the paper....
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with () walls, (...
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with () walls, (ii air, and (ii) a person in it. Explain how heat is transferred by conduction, convection, and radiation in type (a) and (b) to (), (ii, and (ii. Also, discuss in which type, the air become more dryer than the other, why? (30 pt) (a) (b) 바람이 솔솔-추운 창문 앞 설치 노출형 난방기 설치모습 아기목욕을 위해 욕실에 설치 My...
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with (i) walls,...
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with (i) walls, (ii) air, and (iii) how heat is transferred by conduction, convection, and radiation in type (a) and (b) to (i), (ii), and (iii). Also, discuss in which type, the air become more dryer than the other, why? (30 pt) a person in it. Explain a) (b) 바람이 솔솔- 추운 창문 앞 설치 아기목욕을 위해 욕실에 설치 노출형 난방기 설치모습...
A simplified representation for cooling in very large- scale integration (VLSI) of microelectronics is shown in...
A simplified representation for cooling in very large- scale integration (VLSI) of microelectronics is shown in the sketch below. A silicon chip is mounted in a dielectric substrate, and one surface of the system is convectively cooled, while the reminding surfaces are well insulated from the surrounding. The problem is rendered two dimensional by assuming the system to be very large in the direction perpendicular to the paper. Under steady state (1) and transient (2) operation electronic power dissipation in...
asapp
2nd wall has a al Steady state heat transfer thru a 3 layered wall. 1st wall has a AT-20 C wall has a AT = 10 C. How are the different wall resistances related? In the question above, which is the controlling resistance? in lumped analysis, which has the greater resistance? a) conduction inside b) surroundings outside
Thermodynamics
A 29-L electrical radiator containing heating oil is placed in a 41-m3 room. Both the room and the oil in the radiator are initially at 10°C. The radiator, with a rating of 1.8 kW, is now turned on. At the same time, heat is lost from the room at an average rate of 0.35 kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 50°C for the oil in the...
1.23 Under conditions for which the same room tempera- ture is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the win- ter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calcu- lations) by considering a room whose air temperature is maintained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the summer and winter, respectively....
You are in a closed crowded room with a lot of other people. In all likelihood you will start getting very hot and actually begin sweating. Describe what is happening thermodynamically to you and to the room. Make sure you describe your control boundary or control volume. List all assumptions including initial temperatures, pressures, etc. You need to discuss what is happening thermodynamically by referencing the 1st and 2nd Laws of Thermodynamics. Pv and Ts diagrams may be helpful in...
Sphere is made of Silver. The air is still so Heat transfer
would be Free Convection
A sphere of silver of 30 mm diameter is cooling suspended in still air at room temperature of 27°C. If the initial temperature of the sphere is 127°C, what will be its center temperature after 15 minutes? Ignore the radiation effects
A sphere of silver of 30 mm diameter is cooling suspended in still air at room temperature of 27°C. If the initial temperature...
Two-Dimensional Steady and Transient Conduction - Cooling a very
large scale microelectronic chip,
A simplified
representation for cooling in very large-scale integration (VLSI)
of microelectronics is shown in the sketch below. A silicon chip is
mounted in a dielectric substrate, and one surface of the system is
convectively cooled, while the reminding surfaces are well
insulated from the surrounding. The problem is rendered two
dimensional by assuming the system to be very large in the
direction perpendicular to the paper....
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with () walls, (ii air, and (ii) a person in it. Explain how heat is transferred by conduction, convection, and radiation in type (a) and (b) to (), (ii, and (ii. Also, discuss in which type, the air become more dryer than the other, why? (30 pt) (a) (b) 바람이 솔솔-추운 창문 앞 설치 노출형 난방기 설치모습 아기목욕을 위해 욕실에 설치 My...
1. Compare heat transfer modes in the heaters below. For simplicity, the heaters are located in a room with (i) walls, (ii) air, and (iii) how heat is transferred by conduction, convection, and radiation in type (a) and (b) to (i), (ii), and (iii). Also, discuss in which type, the air become more dryer than the other, why? (30 pt) a person in it. Explain a) (b) 바람이 솔솔- 추운 창문 앞 설치 아기목욕을 위해 욕실에 설치 노출형 난방기 설치모습...
A simplified representation for cooling in very large- scale integration (VLSI) of microelectronics is shown in the sketch below. A silicon chip is mounted in a dielectric substrate, and one surface of the system is convectively cooled, while the reminding surfaces are well insulated from the surrounding. The problem is rendered two dimensional by assuming the system to be very large in the direction perpendicular to the paper. Under steady state (1) and transient (2) operation electronic power dissipation in...
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