(b) Consider a person standing in a room maintained at 25°C at all times. The inner surfaces of the walls, floors, and the ceiling of the house are observed to be at an average temperature of 15°C in winter 28°C in summer. The exposed surface area and the average outer surface temperature of the person are 1.5 m² and 30°C, respectively. Given the emissivity of a person of 0.95. [Andaikan seorang sedang berdiri di dalam bilik bersuhu terkawal 25°C sepanjang masa. Suhu dinding permukaan dalam, lantai dan siling diukur pada 15°C ketika musim sejuk dan 28°C ketika musim panas. Luas permukaan terdedah dan suhu purata permukaan luar orang tersebut ialah 1.5 m² dan 30°C. Diberikan keterpancaran manusia ialah 0.95.] (i) Determine the rate of radiation heat transfer between this person and the surrounding surfaces. [Tentukan kadar radiasi pemindahan haba di antara orang dan permukaan sekeliling.] Explain the phenomena of experiencing to feel cooler in the winter and warmer in the summer even when at the temperature is kept the same in houses. [Jelaskan fenomena yang dialami iaitu berasa lebih sejuk ketika musim sejuk dan berasa lebih panas ketika musim panas walaupun suhu di dalam rumah dikekalkan pada suhu yang sama.] (ii) (iii) Give THREE suggestions if you want to decrease the rate of heat loss during winter. [Berikan TIGA cadangan jika anda ingin mengurangkan kadar kehilangan haba semasa musim sejuk.]
(b) Consider a person standing in a room maintained at 25°C at all times. The inner surfaces of the walls, floors, and the ceiling of the house are observed to be at an average temperature of 15°C in winter 28°C in summer. The exposed surface area and the average outer surface temperature of the person are 1.5 m² and 30°C, respectively. Given the emissivity of a person of 0.95. [Andaikan seorang sedang berdiri di dalam bilik bersuhu terkawal 25°C sepanjang masa. Suhu dinding permukaan dalam, lantai dan siling diukur pada 15°C ketika musim sejuk dan 28°C ketika musim panas. Luas permukaan terdedah dan suhu purata permukaan luar orang tersebut ialah 1.5 m² dan 30°C. Diberikan keterpancaran manusia ialah 0.95.] (i) Determine the rate of radiation heat transfer between this person and the surrounding surfaces. [Tentukan kadar radiasi pemindahan haba di antara orang dan permukaan sekeliling.] Explain the phenomena of experiencing to feel cooler in the winter and warmer in the summer even when at the temperature is kept the same in houses. [Jelaskan fenomena yang dialami iaitu berasa lebih sejuk ketika musim sejuk dan berasa lebih panas ketika musim panas walaupun suhu di dalam rumah dikekalkan pada suhu yang sama.] (ii) (iii) Give THREE suggestions if you want to decrease the rate of heat loss during winter. [Berikan TIGA cadangan jika anda ingin mengurangkan kadar kehilangan haba semasa musim sejuk.]
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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HEAT TRANSFER SUBJECT
![(b) Consider a person standing in a room maintained at 25°C at all times. The inner surfaces
of the walls, floors, and the ceiling of the house are observed to be at an average
temperature of 15°C in winter 28°C in summer. The exposed surface area and the
average outer surface temperature of the person are 1.5 m² and 30°C, respectively.
Given the emissivity of a person of 0.95.
[Andaikan seorang sedang berdiri di dalam bilik bersuhu terkawal 25°C sepanjang masa. Suhu dinding
permukaan dalam, lantai dan siling diukur pada 15°C ketika musim sejuk dan 28°C ketika musim panas.
Luas permukaan terdedah dan suhu purata permukaan luar orang tersebut ialah 1.5 m² dan 30°C.
Diberikan keterpancaran manusia ialah 0.95.]
(i)
Determine the rate of radiation heat transfer between this person and the
surrounding surfaces.
[Tentukan kadar radiasi pemindahan haba di antara orang dan permukaan sekeliling.]
Explain the phenomena of experiencing to feel cooler in the winter and warmer
in the summer even when at the temperature is kept the same in houses.
[Jelaskan fenomena yang dialami iaitu berasa lebih sejuk ketika musim sejuk dan berasa lebih
panas ketika musim panas walaupun suhu di dalam rumah dikekalkan pada suhu yang sama.]
(ii)
(iii)
Give THREE suggestions if you want to decrease the rate of heat loss during
winter.
[Berikan TIGA cadangan jika anda ingin mengurangkan kadar kehilangan haba semasa
musim sejuk.]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdb01d844-fd23-484b-ae0c-8e8c4aa81434%2Faee09229-6ad3-4b94-a099-8403a7425616%2F8t3nq3f_processed.png&w=3840&q=75)
Transcribed Image Text:(b) Consider a person standing in a room maintained at 25°C at all times. The inner surfaces
of the walls, floors, and the ceiling of the house are observed to be at an average
temperature of 15°C in winter 28°C in summer. The exposed surface area and the
average outer surface temperature of the person are 1.5 m² and 30°C, respectively.
Given the emissivity of a person of 0.95.
[Andaikan seorang sedang berdiri di dalam bilik bersuhu terkawal 25°C sepanjang masa. Suhu dinding
permukaan dalam, lantai dan siling diukur pada 15°C ketika musim sejuk dan 28°C ketika musim panas.
Luas permukaan terdedah dan suhu purata permukaan luar orang tersebut ialah 1.5 m² dan 30°C.
Diberikan keterpancaran manusia ialah 0.95.]
(i)
Determine the rate of radiation heat transfer between this person and the
surrounding surfaces.
[Tentukan kadar radiasi pemindahan haba di antara orang dan permukaan sekeliling.]
Explain the phenomena of experiencing to feel cooler in the winter and warmer
in the summer even when at the temperature is kept the same in houses.
[Jelaskan fenomena yang dialami iaitu berasa lebih sejuk ketika musim sejuk dan berasa lebih
panas ketika musim panas walaupun suhu di dalam rumah dikekalkan pada suhu yang sama.]
(ii)
(iii)
Give THREE suggestions if you want to decrease the rate of heat loss during
winter.
[Berikan TIGA cadangan jika anda ingin mengurangkan kadar kehilangan haba semasa
musim sejuk.]
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