制冷设备,制冷技术,制冷系统开发商

制冷

Ice harvesting

时间:2013-01-08 10:39来源:冷凝机、蒸发机 作者:admin 点击:
The use of ice to refrigerate and thus preserve food goes back to prehistoric times.Through the ages, the seasonal harvesting of snow and ice was a regular practice of most of the ancient cultures: Chinese, Greeks, Romans, Persians. Ice an

The use of ice to refrigerate and thus preserve food goes back to prehistoric times.Through the ages, the seasonal harvesting of snow and ice was a regular practice of most of the ancient cultures: Chinese, Greeks, Romans, Persians. Ice and snow were stored in caves or dugouts lined with straw or other insulating materials. The Persians stored ice in a pit called a yakhchal. Rationing of the ice allowed the preservation of foods over the warm periods. This practice worked well through the centuries, with icehouses remaining in use into the 20th century.

In the 16th century, the discovery of chemical refrigeration was one of the first steps toward artificial means of refrigeration. Sodium nitrate or potassium nitrate, when added to water, lowered the water temperature and created a sort of refrigeration bath for cooling substances. In Italy, such a solution was used to chill wine and cakes.

(责任编辑:admin)
顶一下
(0)
0%
踩一下
(0)
0%
------分隔线----------------------------
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片
栏目列表
推荐内容
  • Magnetic refrigeration

    Magnetic refrigeration, or adiabatic demagnetization, is a cooling technology ba...

  • Nash integrated system

    In 1954 the Nash Ambassador was the first American automobile to have a front-en...

  • Portable units

    A portable air conditioner is one on wheels that can be easily transported insid...

  • Evaporative coolers

    In very dry climates, evaporative coolers, sometimes referred to as swamp cooler...

  • Refrigeration cycle

    In the refrigeration cycle, a heat pump transfers heat from a lower-temperature ...

  • Electromechanical cooling

    In 1902, the first modern electrical air conditioning unit was invented by Willi...