The surface of a household radiator has an emissivity of 0.55 and an area of 1.5 m 2 .
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(539 W, 375 W, 164 W)
e σ AT 4 = 0.55 × 6 × 10 – 8 × 1.5 × (323) 4 = 539 W
e σ AT 4 Surr. = 0.55 × 6 × 10 – 8 × 15 × (295) 4 = 375 W
539 – 375 = 164 W
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