建築環境控制 吳宗泰
濕度線圖
原本室內乾球溫度36oC,相對濕度45%,空調後室內乾球溫度20oC,相對濕度80%,用濕度線圖回答下列問題 1
冷氣機結構
冷媒過程 2 3 1 4 火啇
空調箱 (AHU) 新鮮空氣 供應空氣 返回空氣 排出空氣 Outside Air Supply Air Re-circulated Air Exhaust Air Return Air 排出空氣 返回空氣
Power Factor (cosq) Apparent power 視在功率 S [VA] Q [VAR], Reactive power 虛功率,無效功率 q P [W] Absolute power 絕對功率 True (Real) power 真實功率 Active power 有效功率 S = P + j Q = S cosq + j S sinq P Power factor (P.F) = cosq = 功率因數,電力率 S
RMS value, induction load, i (t) lagging v (t) (Vmax : Imax) (Vrms : Irms) i (t) 90o (0.5p) 370o (1.5p) 360o (2p) 180o (p) v (t)
Balanced three-phase (3-f) voltage source Phase a a Phase b Balanced 3-f power source b Van Vbn Phase c c Vcn n
Y - connected loads ZY ZY ZY ZY ZY ZY Load Load
D - connected loads ZD ZD ZD ZD ZD ZD Load Load
Phasor diagram for a balanced three-phase (3-f) voltage source Vcn 120o 120o Van 120o Vbn
Balanced three-phase (3-f) AC loads
Phasor representation of phase and line voltages in a balanced Y-Y system Vcn Vab Van 60o 120o 1 Vbn 2