Solar Fridge Refrigeration Information
Posted by sdutta3 on Tue, 09/04/2007 - 17:54 in
Refridge techniques
http://en.wikipedia.org/wiki/Icy_Ball
http://www.nrjrealiste.fr/solaire/frigoHK.pdf
http://www.monash.edu.au/pubs/eureka/Eureka_95/fridge.html
For the wind chart of Haiti, see this:
At our next meeting (Tues, Sept. 11th, 6pm), we'll be 1) brainstorming 2) getting a mini-lesson on refrigeration.
See you then!
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Sep. 26 - 12:00PM - Enugu Project Meeting
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links to solar ice maker
http://www.thesustainablevillage.com/servlet/display/microenterprise/display/14
http://web.worldbank.org/WBSITE/EXTERNAL/OPPORTUNITIES/GRANTS/DEVMARKETPLACE/0,,contentMDK:20900187~pagePK:180691~piPK:174492~theSitePK:205098,00.html
bogle – Thu, 09/13/2007 – 8:37am
next assignment
No Meeting this Week! (Sept. 18th)
Please continue to research the part of the project assigned to you & post the results here. If you are having problems signing up w/ the website, email me (bogle [at] uiuc [dot] edu)
bogle – Mon, 09/17/2007 – 10:20pm
ok, this is some stuff we all know hopefully but is a good start to get thinking.
interesting definition - ODP - ozone depletion potential.
Since CFCs contain no hydrogen in molecules, they are stable in the atmosphere. This means they cannot be easily broken down until they reach the stratosphere and thus have a high ODP.
Since they contain hydrogen in molecules, HCFCs can be broken down relatively easily in the atmosphere and thus have a low ODP.
Since they contain no chlorine or bromine, HFCs have an ODP of zero.
The potential impact that substances have on global warming is generally shown by their GWP (global warming potential). GWP is calculated as the integrated value of the potential warming impact of a substance compared to the impact of the same amount of CO2 over a period of time. Usually 100 year values are used.
In addition to the six substances covered by the Kyoto Protocol, there are other global warming substances.
Global warming impact differs from substance to substance. The atmospheric life of substances has a great affect on their global warming impact.
PFCs (perfluorocarbons) and SF6 (sulfur hexafluoride), which contain no hydrogen molecules, have an atmospheric life ranging from several thousand years to several tens of thousands of years, therefore, the longer the integration period, the higher their GWP.
As for the atmospheric life of HFCs, which contain hydrogen in molecules, HFC25, the major component of HFC blend refrigerants, lasts for 29 years, while HFC32 lasts for only 5 years. For example, comparing HFC125 and PFC14, their GWPs over 100 years are 3400 and 5700, respectively, not that big a difference. However, over 500 years, HFC125 has a GWP just one-eighth of PFC14. This shows the strong effect of atmospheric life on GWP.
HFC134a is a CFC12 substitute refrigerant used in car air-conditioners and refrigerators. The use of this substitute results in global warming potential dropping from 10,600 to 1,300 (over 100 years), a huge difference.
amarbehera – Tue, 09/18/2007 – 12:08am