水泵扬程估算方法.doc

水泵扬程的计算公式本来就是估算，所以还不如彻底估算
估算方法1：
暖通水泵的选择：通常选用比转数ns在130～150的离心式清水泵，水泵的流量应为冷水机组额定流量的1.1～1.2倍（单台取1.1，两台并联取1.2。按估算可大致取每100米管长的沿程损失为5mH2O，水泵扬程（mH2O）：
Hmax=△P1+△P2+0.05L (1+K)
　　△P1为冷水机组蒸发器的水压降。
　　△P2为该环中并联的各占空调未端装置的水压损失最大的一台的水压降。
　　L为该最不利环路的管长
　　K为最不利环路中局部阻力当量长度总和和与直管总长的比值，当最不利环路较长时K值取0.2～　0.3，最不利环路较短时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: