Based on q = hΔT. | Based on ΔT = f{q}. | – |
---|---|---|
U = 1/(1/h_{1}{ΔT_{1}} + t/k + 1/h_{2}{ΔT_{2}) | ΔT_{total }= ΔT_{1}{q} + ΔT_{wall}{q} + ΔT_{2}{q} | (1) |
ΔT_{total }= 320 – 200 = 120 | ΔT_{total} = 320 – 200 = 120 | (2) |
h_{1} = .40(ΔT_{1})^{.33} | ΔT_{1} = 1.99q^{.75} | (3) |
t_{wall}/k_{wall} = .05 | ΔT_{wall} = .05q | (4) |
h_{2} = .80(ΔT_{2})^{.50} | ΔT_{2} = 1.16q^{.667} | (5) |
U = 1/(1/.4(ΔT_{1})^{.33 }+.05 + 1/.8(ΔT_{2})^{.50}) | 120 = 1.99q^{.75 }+ .05q + 1.16q^{.667} | (6) |