In the early days of mechanical refrigeration, flammable chemicals such as ammonia were used as refrigerant.
在早期的机械制冷，易燃的化学物质如氨作为制冷剂。
Mechanical refrigeration, often referred to simply as refrigeration, is a process by which heat is removed from a location using a man-made heat-exchange system.
机械制冷，通常简称为制冷，是一个过程，热量从一个位置使用人造换热系统。
Even when mechanical refrigeration lessened the need for salt in the 19th century, consumption continued in excess because people liked the taste and it had become fairly inexpensive.
即使在19世纪，冷藏机器逐渐取代了对盐的需求，因为人们喜欢这种味道、盐的的价格也不再昂贵，因此对于盐的消费还在继续增长。
The space environment, combined with mechanical and cryogenic refrigeration systems using hydrogen and helium, chill the coldest instruments to 0.1 kelvin in four sequential steps.
利用太空的环境，以及机械和氢和氦的冷冻系统，分4个步骤把这个最冷的仪器冷却到只有0.1开尔文。
Applying the slender crankshaft, the level rolling bearing technology, and lower viscosity refrigeration oil, increased the mechanical efficiency.
采用细曲轴及平面滚动轴承技术及较低粘度的冷冻油以提高机械效率。
This article introduces a refrigeration method using the absorption chiller energized by the district heating system instead of electricity or mechanical energy in summer in Finland.
在夏季采用区域供热系统的热量作为吸收式冷凝器制冷系统的能源，可代替电和机械能源制冷。
When the tank pressure reaches 305 psig, a mechanical air-cooled refrigeration unit is activated which cools the tank contents and thereby reduces the pressure to about 295 psig.
当容器压力达到305 psig时，启动机械空气冷却制冷设备，使容器内容物降温，从而压力降到约295 ps ig。
Corrugated boxes for frozen foods can be very easy to collapse in refrigeration process. It was put forward that the cause of collapse is decrease of mechanical property of corrugated box.
针对冷冻食品包装用瓦楞纸箱在冷库贮存过程中的塌箱现象，指出了塌箱主要是由于纸箱力学性能降低引起的。
Second-hand air conditioning sales recovery: central air conditioning, refrigeration equipment, electrical and mechanical equipment, materials recovery.
二手空调销售回收：中央空调，制冷设备，机电设备，物资回收。
Second-hand air conditioning sales recovery: central air conditioning, refrigeration equipment, electrical and mechanical equipment, materials recovery.
二手空调销售回收：中央空调，制冷设备，机电设备，物资回收。
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