双泵并联在大型冷水（热泵）机组性能测试系统中的节能应用

Energy-saving Application of Double Pump Parallel Connection in Performance Test System for Large-scale Cold Water(Heat Pump) Unit

为提高大型冷水(热泵)机组测试系统在被测试机组负荷处于测试系统设计下限时的循环水泵综合运行效率,本文提出测试系统的循环水泵采用双泵并联的模式,并在测试能力在400~2,000冷吨的水冷冷水(热泵)机组性能测试台上,针对不同制冷能力的水冷冷水机组,分别进行单泵和双泵并联运行,达到稳定工况。结果表明:当被测试机组的负荷高于测试系统上限的60%时,双泵并联运行模式的能耗与单泵运行模式的水泵能耗相差较小;当被测试机组的负荷低于测试系统上限的60%时,双泵并联模式下的水泵节能效果显著;当被测试机组负荷处于测试系统测试下限时,相比较单泵运行模式,采用双泵并联模式可降低水泵运行功耗35.9%。

In order to improve the operational efficiency of the test system of large-scale cold water(heat pump) unit when the load of the tested unit is at the lower limit of the design of the test system, the mode of two pumps in parallel is adopted in the circulating water pump of the test system in this paper. On a water-cooled chiller(heat pump) unit performance test bench with a test capability of 400-2,000 RT, single pump and double pump in parallel are performed for water-cooled chiller units with different cooling capabilities to achieve stable operating conditions. The results show that when the load of the tested unit is higher than 60% of the upper limit of the test system, the energy consumption of the pump in the operation mode of the double pump is almost the same as that in the single pump operation mode;when the load of the tested unit is lower than 60% of the upper limit of the test system, the energy-saving effect of the pump in the operation mode of the double pump is significant;when the load of the tested unit is at the lower limit of the test system, the power consumption of water pump can be reduced by 35.9% by using the parallel mode of two pumps.