Considere uma estufa usada em um laboratório qualquer. A câmara tem formado de um cubo perfeito com lado igual a 75 cm, desse modo deseja-se saber qual a espessura mínima requerida do isolante térmico de espuma de poliestireno (K = 0,025 W / m. K) que deve ser usado na estufa, para garantir que a taxa que entra nele seja inferior a 900 W.
Considere que suas temperaturas são: superfície interna 105 °C e externa 28°C.
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