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

[Joe Huang via Equest-users]

This reminds me of the hoopla about "Cold Fusion" 30 years ago.  Gad, am I showing my age! :-( :-(

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 7/20/2016 5:28 AM, Chris Jones wrote:
>
> My observations are that the air does heat up when compressed then cooled when it 
> decompresses. For example, if you have a large take of compressed air used to fill a 
> small tank, the small tank heats up as it is filled and the large tank cools off as it 
> does the filling of the small tank.
>
> That would lead me to believe that, in the end, the air would be roughly the same 
> temperature after it went through the compression then decompression as it traveled 
> through the bottles from outside to inside. The bottles might absorb some of the heat 
> from the compressed air and then you would have a wall that is warmer than room. In the 
> end, I don’t believe there would be much change in temperature in the room.
>
> **
>
> *Christopher Jones, P. Eng.*
>
> *Rowan Williams Davies & Irwin Inc.*
> /Consulting Engineers & Scientists/
> 901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5
> *T:* (519) 823-1311 ext 2052
>
> *M:*(416) 697-0056
>
> *From:*Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Joe Huang via Equest-users
> *Sent:* Tuesday, July 19, 2016 8:54 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] How do you think about the no electricity Eco-Coolers from 
> Bangladesh
>
> I saw today the same technology also promoted on the CIBSE Bulletin Board even with a 
> video "explaining" how it works (the plastic bottles supposedly "compresses and cools 
> the air")
>
> ( 
> https://www.linkedin.com/groups/75555/75555-6160367729091100672?midToken=AQF3zdCi1vKWLA&trk=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion&trkEmail=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion-null-bc6m0%7Eiqtrhngl%7Eh3 
> )
>
> To me, this seems more like wishful thinking.  My comment posted on the CIBSE Bulletin 
> Board was:
>
> I don't understand how this would work from a thermodynamic point of view. There has to 
> be some air velocity to begin with, in which case I can see how the bottles might 
> channel the air flow resulting in higher air velocities coming out of the bottle 
> openings, but wouldn't the total amount of air flow be the same, or less than through 
> the window opening with no obstruction? Also, someone explain to me how compressing the 
> air will cool it?? I've always thought that compressing the air would heat it up, 
> although in this case the effect would be extremely minimal either way.
>
> Joe
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 205A
> Moraga CA 94556
> yjhuang at whiteboxtechnologies.com <mailto:yjhuang at whiteboxtechnologies.com>
> http://weather.whiteboxtechnologies.com  for simulation-ready weather data
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
>
> On 7/14/2016 7:22 PM, 冷面寒枪 via Equest-users wrote:
>
>     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 <mailto:Email:zhaoyongqing1987 at 126.com>
>
>     503271081 at qq.com <mailto:503271081 at qq.com>
>
>
>
>
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