In the early days of mechanicalrefrigeration, 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。
2
Mechanicalrefrigeration, 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。
3
Even when mechanicalrefrigeration lessened the need for salt in the 19th century, consumption continued in excess because people liked the taste and it had become fairly inexpensive.