空调水泵扬程的计算公式(国外英文资料).docVIP

空调水泵扬程的计算公式(国外英文资料) Hefei zhida environmental engineering co., LTD. : the calculation formula of pump head: Estimation method 1: The choice of hvac water pump: usually choose than revolutions ns in 130 ~ 150 of centrifugal water pump, water pump flow should be chiller 1.1 ~ 1.2 times the rated flow (single take 1.1, two parallel take 1.2. Press estimates can take roughly every 100 meters length of the path loss is 5 mH2O, pump head (mH2O) : Hmax = delta P1 + delta P2 + 0.05 L (1 + K). Delta P1 is the water pressure drop for the cold water unit evaporator. Delta P2 is the water pressure drop of one of the maximum water pressure losses of the unconnected air conditioning units in the loop. L is for the longest line K for local resistance in the most unfavorable loop combined equivalent length and the ratio of and straight pipe length, when the most unfavorable loop is longer than the K value 0.2 ~ 0.3, the most unfavorable loop shorter take 0.4 ~ 0.6 K value Estimation method 2: What were talking about here is the resistance of the closed air conditioning cold water system, because the system is a regular system. Cold water unit resistance: supplied by the unit factory, usually 60-100kpa. Pipe resistance: including friction resistance and local resistance, the friction resistance of unit length is compared to that of the moan group depending on the technology economic comparison. If the size is small and the initial investment province is small, the water pump runs on energy. If the values are small, the reverse. The ratio of cold water pipes in the current design is controlled in the range of 150 ~ 200Pa/m, which can be smaller in size. Air conditioning unmounted resistance: the end device type has fan coil unit, combined air-conditioner and so on. Their resistance was presented according to the design of air into and out of the air conditioning coil parameters, cooling capacity, and poor water provided by the factory after coil configuration computation, many can v