Saturday, March 23, 2013

Soal dan Pembahasan Perpindahan Kalor (Konduksi, Konveksi, Radiasi)

1. Suhu udara dalam sebuah ruangan sebesar 20°C, sedangkan suhu permukaan jendela padaruangan tersebut 30°C. Berapa laju kalor yang diterima oleh jendelakaca seluas 1,5 m2, jika koefisien konveksi udara saat itu 7,5 X 10J1 kal/s m2 °C?
Text Box:  Jawab:

AT = t2— t1 =30°C-20°C= 10°C
A =1,5m2 
h =7,5x10-1kal/sm2°C

H =h.A.ΔT 
(7,5 x 10-1kal/sm2°C) (1,5m2) (10°C) = 11,25kal
Jadi, laju kalor yang diterima oleh jendela kaca 11,25 kal

2.Sebuah benda memiliki permukaan hitam sempurna bersuhu 127°C. Luas permukaan 300 cm2 memancarkan energi ke lingkungan yang bersuhu 27°C. Tentukan energi per satuan waktu yang dipancarkan benda tersebut.

3. Pada Suhu 2.000 K, Sebuah benda memancarkan energi SebeSar 480 J/s. Berapa energi yang dipancarkan benda tersebut pada Suhu 3.000 K?
W1 : W2 = (T1 : T2)4 
480 : W2 = (2000 : 3000)4
480 : W2 = (2000 : 3000)4 
480 : W2 = 16 : 81
W2 = 2430 J/s

4. Teh panas bersuhu 87°C dituangkan ke dalam dua buah teko yang satu teko keramik warna hitam (e = 0,8) dan satunya lagi teko mengkilat (e = 0,3). Jika Suhu ruang 27°C, berapa kecepatan hilangnya kalor dari setiap teko ke lingkungan jika luas permukaan teko adalah 2 x 102 m2?

5. Pengaduk terbuat dari aluminium dengan luas penampang 5 mm2 dan panjang 10cm. Jika suhu air dalam bejana 60°C, suhu di ujung pengaduk 62°C, dan konduktivitas termal = 200 W/m°C, tentukan: 
a.   kecepatan aliran kalor pada aliran kalor pada pengaduk, 
b.   kalor yang mengalir melalui pengaduk Selama 1jam.

6. Kopi panas bersuhu 77°C dituangkan ke dalam cangkir keramik warna cokelat (e = 0,5). Jika suhu ruang 27°C, tentukan kecepatan hilangnya kalor dari cangkir ke lingkungan. (luas cangkir 20cm2)

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Soal dan Pembahasan Perpindahan Kalor (Konduksi, Konveksi, Radiasi) Rating: 4.5 Diposkan Oleh: andhiart ab


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