[Equest-users] How do you think about the no electricity Eco-Coolers from Bangladesh

[冷面寒枪 via Equest-users]

Recently,I read the news about the zero air cooler,which is made with re-purposed plastic bottles.And the new claims that it helps reduce indoor temperature by 5 degrees centigrade.
 The making process is shown as following:
 
 
 I dout that very much.
  
 the Joule-Thomson Coefficient for air (mostly nitrogen) at 300K (27°C/80°F) is about 0.36K/bar. This means that at 300K a 1bar change in pressure equates to a 0.22K. The change in pressure required to get the 5°C (5K) reduction would therefore be:

5 / 0.22 = 22.7bar
  
 
 So I think it is impossible the temperature drop will be up to 5  degrees centigrade after the air through the bottle.
  
 What do you think?
  
 ------------------  
    Yongqing Zhao
 Changsha Green Building & Energy Saving Technology CO.,LTD
NO.438,Shaoshan Road,Changsha,Hunan,China
Telephone:13574805636
 Email:zhaoyongqing1987 at 126.com
          503271081 at qq.com
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