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A 4-m × 5-m× 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 25°C. Assume constant specific heats at room temperature. The gas constant of air is R = 0.287 kPa.m³/kg-K (Table A-1). Also, C₁ = 0.718 kJ/kg-K for air at room temperature (Table A-2). 5000 kJ/h Room 4m x 5m x 7m 10,000 kJ/h Steam pw It will take 831 s for the air temperature to rise to 25°C.

A 4-m × 5-m× 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 25°C. Assume constant specific heats at room temperature. The gas constant of air is R = 0.287 kPa.m³/kg-K (Table A-1). Also, C₁ = 0.718 kJ/kg-K for air at room temperature (Table A-2). 5000 kJ/h Room 4m x 5m x 7m 10,000 kJ/h Steam pw It will take 831 s for the air temperature to rise to 25°C.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A 4-m × 5-m × 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 25°C. Assume constant specific heats at room temperature. The gas constant of air is R = 0.287 kPa·m3/kg·K (Table A-1). Also, cv = 0.718 kJ/kg·K for air at room temperature (Table A-2).

 

Steam enters the radiator system through an inlet outside the room and leaves the system through an outlet on the same side of the room. The fan is labeled as W sub p w. The heat is given off by the whole system consisting of room, radiator and fan at the rate of 5000 kilojoules per hour.

 

It will take 831  Numeric ResponseEdit Unavailable. 831 incorrect.s for the air temperature to rise to 25°C.

A 4-m × 5-m× 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 25°C. Assume constant specific heats at room temperature. The gas constant of air is R = 0.287 kPa.m³/kg-K (Table A-1). Also, C₁ = 0.718 kJ/kg-K for air at room temperature (Table A-2). 5000 kJ/h Room 4m x 5m x 7m 10,000 kJ/h Steam pw It will take 831 s for the air temperature to rise to 25°C.
Transcribed Image Text:A 4-m × 5-m× 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 25°C. Assume constant specific heats at room temperature. The gas constant of air is R = 0.287 kPa.m³/kg-K (Table A-1). Also, C₁ = 0.718 kJ/kg-K for air at room temperature (Table A-2). 5000 kJ/h Room 4m x 5m x 7m 10,000 kJ/h Steam pw It will take 831 s for the air temperature to rise to 25°C.
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