请帮忙翻译几个单词1.变频水泵2.节能灯3.热交换装置 4.冷水机组 6.螺杆机组取代活塞机组7.日光灯8.节能灯9.投

1.变频水泵 Frequency converter pump
2.节能灯 Energy saving lamp
3.热交换装置 Heat Transfer device
4.冷水机组 chiller water unit
6.螺杆机组取代活塞机组 screw unit has displaced piston unit
7.日光灯 Fluorescent lamps
8.节能灯 Energy saving lamp
9.投资回收周期 Cycle of Investment's Recovery