水泵揚程估算方法.doc

水泵揚程的計算公式本來就是估算，所以還不如徹底估算
估算方法1：
暖通水泵的選擇：通常選用比轉數ns在130～150的離心式清水泵，水泵的流量應為冷水機組額定流量的1.1～1.2倍（單臺取1.1，兩臺并聯取1.2。按估算可大致取每100米管長的沿程損失為5mH2O，水泵揚程（mH2O）：
Hmax=△P1+△P2+0.05L (1+K)
　　△P1為冷水機組蒸發器的水壓降。
　　△P2為該環中并聯的各占空調未端裝置的水壓損失最大的一臺的水壓降。
　　L為該最不利環路的管長
　　K為最不利環路中局部阻力當量長度總和和與直管總長的比值，當最不利環路較長時K值取0.2～　0.3，最不利環路較短時K值取0.4～0.6

估算方法2：
Pump lift formula was originally estimated, so it was not as thorough estimate
Estimation Method 1:
HVAC Pump Selection: Selection is usually specific speed ns in the 130 to 150 of the centrifugal water pump, water pump flow should be rated for the cold water flow rate of 1.1 units to 1.2 times (1.1, single take, take two parallel 1.2. According to estimates can be roughly taken every 100 meters along the tube length loss 5mH2O, pump lift (mH2O):
Hmax = △ P1 + △ P2 +0.05 L (1 + K)
△ P1 for the chiller evaporator water pressure drop.
△ P2 ring in parallel for each air conditioning unit did not end the pressure in the largest loss of a water drop.
The most unfavorable loop L tube length
Circle K for the most disadvantaged in the sum of local resistance and the equivalent length of straight pipe length and the ratio of a longer time when the most unfavorable Circle K value is 0.2 ~ 0.3, the most negative short loop to take the time value of 0.4 ~ 0.6 K

Estimation Method 2:
 

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