大型往复式压缩机功率大、占地面积大，管道振动问题也更为突出。
The pipe vibration problem is especially serious in large reciprocating compressor because of its big power and large bulk.
根据制冷量 500kW 等设计参数对冷水机组进 行了热力计算，确定了冷凝器热负荷及压缩机功率。
The thermodynamic calculation for the water chiller was Carried on basing on the design parameters such as 500kW cooling capacity to determine the condenser's heat loads and compressor power.
但由于目前石油和化工用螺杆式压缩机对流量、排出压力、轴功率等要求较高，目前基本上还依赖进口。
But because it now oil and chemical use screw compressor for flow and pressure from the shaft power, high demands, at present basically also rely on imports.
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