Page 38 - Digital Book Bilingual Perpindahan Kalor
P. 38
example
example
A fluid with a thermal convection coefficient of 0.01 cal m⁻¹ s⁻¹ °C⁻¹
flows through a channel with a cross-sectional area of 20 cm².If the
fluid flows between two parallel walls, one at a temperature of 100°C
and the other at 20°C, how much heat is transferred?
A N S W E
A N S W E R R
Given:
h = 0.01 cal m⁻¹ s⁻¹ °C⁻¹
A = 20 cm² = 20 × 10⁻⁴ m²
ΔT = 100 − 20 = 80 °C
A person has a body temperature of 32°C and is in a room with an air
temperature of 26°C. If the surface area of the body is approximately
1.5 m² and the convective heat transfer coefficient is 7.1 J s⁻¹ m⁻² °C⁻¹,
calculate the rate of heat released by the body through convection.
A N S W E R R
A N S W E
Given:
h = 7.1 J s⁻¹ m⁻² °C⁻¹
A = 1,5 m²
T1 = 32°C = 305 K
T2 = 26°C = 299 K
ΔT = 305 K -299 K = 6 K
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