机械循环 meaning in English

mechanical circulation
mechanical cycle

There are several important issues to that attention should be paid in the design of test bed , such as the measurement of the temperature difference between the inlet and outlet of test section and the temperature of cooling water in the inlet and outlet of condensing tubes , filled volume of the steam boiler and its level control , the determination of the natural acting head of high temperature tank and design of the cooling water flow of measuring tank
试验台由高温工质自然循环子系统、冷却水机械循环子系统和计算机监测控制子系统构成，试验段进出口温差及冷凝管进出口温度的测试、蒸汽锅炉充注量及液位控制、高温水箱自然作用水头的设计、冷却水流量计量水箱的设计等是试验台设计中值得重视的问题。