p = p + p pv = wrt = 287.1 j/kg.k (for air) p a p s 0.425 0 exam... · 2017-01-13 · latent...
TRANSCRIPT
PT = Pw + Pa PV = wRT Rw = 461.5 J/kg.K (for water vapour) Ra = 287.1 J/kg.K (for air)
Pw = 𝑃𝑇𝑊
0.622+𝑊 W =
𝑤𝑤
𝑤𝑎=
0.622𝑃𝑤
𝑃𝑇−𝑃𝑤
Latent (kJ/kg) = W (2500 + 1.86t) Sensible (kJ/kg) = 1.005t
M = 𝜇
𝑙 W = M (Pw1 – Pw2)𝜃A
Pw = Ps x RH Mc = 1
𝑅𝑣𝑐 =
11
𝑀1+
1
𝑀2+ …
= R1 + R2 +…
RH = 𝑃𝑤
𝑃𝑠 x 100
∆𝑃𝑤
∆𝑃𝑤 𝑇𝑜𝑡𝑎𝑙=
𝑅𝑣
𝑅𝑣 𝑇𝑜𝑡𝑎𝑙
Dubois Equation
A = 0.2024m0.425h0.725 Energy = Power x Time
°C + 273 = K C = 1
𝑅 =
𝑘
𝑙
𝑅𝑡𝑜𝑡 = 𝑅1 + 𝑅2 + 𝑅3 + ⋯ + 𝑅𝑛 =1
𝑈
Ein = ∝It Eout = εσT4
𝑇 = √𝛼𝐼𝑡
𝜀1𝜎+𝜀2𝜎
4 𝑄 =
𝐴
𝑅∆𝑇𝑡 ; 𝑄 =
𝐴
𝑅𝐻𝐷𝐷
𝑞 =𝐴
𝑅∆𝑇
∆𝑇𝑖
∆𝑇𝑡𝑜𝑡=
𝑅𝑖
𝑅𝑡𝑜𝑡
𝑞1−2 = 𝐹𝐸 ∙ 𝜎𝐴1(𝑇14 − 𝑇2
4) 𝑤ℎ𝑒𝑟𝑒 𝐹𝐸 =1
1𝜀1
+1𝜀2
− 1
𝜎 = 5.67𝑥10−8 𝑄 = 𝐶𝐴 [2
𝜌(𝑝1 − 𝑝2]
1/2
𝑞 = 𝑆𝐶𝑥𝑆𝐻𝐺𝐹𝑥𝐶𝑙 ∓ 𝑈(𝑡𝑖 − 𝑡𝑜) 𝑉𝑧
𝑉𝑔= [
𝑍
𝑍𝑔]
𝛼
𝐺
𝐺𝑔= [
𝑍
𝑍𝑔]
𝛽
𝐺𝑔 = 1.35𝑉𝑔
𝐶𝑝 =𝑝
1/2𝜌𝑉2 𝑝𝑠 = 0.0342ℎ𝑝𝑡(
1
𝑇𝑜−
1
𝑇𝑖)
∆𝑝 = 𝛾𝑝𝑠 = 0.0342𝛾ℎ𝑝𝑡∆𝑇
𝑇𝑖𝑇𝑜 𝛾 = 𝑡ℎ𝑒𝑟𝑚𝑎𝑙 𝑑𝑟𝑎𝑓𝑡 𝑐𝑜𝑒𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑡