Question

(e) Referring to the following diagram of heat transfer model in a combustion chamber, state: (i) The types of heat transfer mechanisms presented by $q_1$, $q_2$ and $q_3$ (ii) Describe the presented heat transfer formulae for $q_1$, $q_2$ and $q_3$ respectively (iii) Plot thermal circuit (iv) Give out energy conservation equation using $q_1$, $q_2$ and $q_3$ based on heat transfer mechanism. (f) A space vehicle is in a totally dark vacuum at absolute zero. The envelope area is 15 m$^2$. The heat loss into space must not exceed 180 W. The emissivity of the surface is 0.15. Calculate the surface temperature of the vehicle. $\sigma = 5.67 \times 10^{-8} W/m^2 K^4$

          (e) Referring to the following diagram of heat transfer model in a combustion chamber, state:
(i) The types of heat transfer mechanisms presented by $q_1$, $q_2$ and $q_3$
(ii) Describe the presented heat transfer formulae for $q_1$, $q_2$ and $q_3$ respectively
(iii) Plot thermal circuit
(iv) Give out energy conservation equation using $q_1$, $q_2$ and $q_3$ based on heat transfer mechanism.
(f) A space vehicle is in a totally dark vacuum at absolute zero. The envelope area is 15 m$^2$. The heat loss into space must not exceed 180 W. The emissivity of the surface is 0.15. Calculate the surface temperature of the vehicle. $\sigma = 5.67 \times 10^{-8} W/m^2 K^4$

(e) Referring to the following diagram of heat transfer model in a combustion chamber, state:
(i) The types of heat transfer mechanisms presented by q1, q2 and q3
(ii) Describe the presented heat transfer formulae for q1, q2 and q3 respectively
(iii) Plot thermal circuit
(iv) Give out energy conservation equation using q1, q2 and q3 based on heat transfer mechanism.
(f) A space vehicle is in a totally dark vacuum at absolute zero. The envelope area is 15 m^2. The heat loss into space must not exceed 180 W. The emissivity of the surface is 0.15. Calculate the surface temperature of the vehicle. σ = 5.67 × 10^-8 W/m^2 K^4

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