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Anonymous Poster

Village Fridge

06/03/2006 8:38 AM

nirav modi writes:
"Village Fridge"
prepared by Engineering Students of SVIT College at VASAD.

In olden days, the train was run by coal. Now it runs by electricity. To prove the importance of coal the two engineering students have prepared a unique working model of a village fridge. First of all it makes surprise to us but it is true. Village fridge is prepared by two students studying in 3rd year Mechanical Engineering namely Ronak Shah and Nirav Modi. The fridge having total capacity of 185 ltrs costs around Rs.2500. As per the opinion of Ronak "the out look of this fridge is exactly the same as the domestic freeze. We have constructed the body of the fridge by using iron angles and iron fencing net. The body of fridge is supported by four feet of iron angles, which is covered by iron fencing net of two layers excluding the front side, keeping the space between the two layers ranging from 1 inch to 2 inch. In between two layers the coal is filled from top to bottom. We have put one bucket on the top of the fridge from which water passes through the pipes between the filled section of two layers of coal in order to keep coal continuously wet. Subsequently atmospheric air circulation takes place, so cooling effect is produced inside the fridge. We divide the inner portion of the body in three parts by fitting thermo coal sheet. As a result of the above process 15-degree temperature can be sustained inside the fridge".

Ronak and Nirav had prepared this village fridge to take part in PROJECT COMPETETION at the National level Tech fest named as "Village Fridge". Still today there are thousands of villages without electricity in our country. Hence the people of such villages do not use domestic freeze, which runs with electricity, so are deprived of benefit of the modern age freeze. Looking to this situation Ronak and Nirav thought to prepare fridge, which can be use by village peoples.

Nirav says, "We have compared the product of village fridge with domestic freeze. Our fridge is so successful than the domestic freeze in maintenance cost, operating cost and production cost. In domestic freeze power unit consumed 90 units per month and 1080 units per annum. If we calculate the cost @ Rs.4 per unit the power cost of domestic freeze would be Rs.4320 P.A, while in village fridge we can save this cost. Due to low cost of this fridge village peoples as well as poor peoples of city can also afford this model in summer season also. Approx. 50 kgs. of coal consumed and lasted for 3 to 4 years, and then after it can be reused as fuel or any other way".

Further they told that in this model we cannot achieve 0 degree temperature. So we cannot get ice. People who are used to drinking chilled water they cannot get that much chilled water in this fridge, but this fridge is too much useful for preserve the Milk, Fruits, Vegetables and food in fresh condition.

(As per the article published in local news paper dt.23/03/2006)

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Anonymous Poster
#1

doubt it

06/04/2006 4:04 AM

well mate first of all, you need some serious english lessons, can you actually get such a temprature loss through an evaporative cooling process using carbon as a catalyst, I really doubt it.

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Commentator
France - Member - Blue Rabbit

Join Date: Apr 2006
Location: Douarnenez, Bretagne, France
Posts: 80
Good Answers: 1
#6
In reply to #1

Re:doubt it

06/05/2006 12:02 PM

Anonymous Coward writes....
"well mate first of all, you need some serious english lessons, can you actually get such a temprature loss through an evaporative cooling process using carbon as a catalyst, I really doubt it."

Really! Best stay anonymous, you coward. I don't suppose that your grammar is any better in your second or third language than it is in your English. Has no-one told you that we capitalise the first word in a sentence? Try flame.com if your only intention is to criticise those with enthusiastic, if naive, ideas.

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Anonymous Poster
#7
In reply to #1

Re: doubt it

04/10/2010 3:45 PM

I really appreciate the efforts of these Engineering students. Though most of these old technologies are known how many of us use the basic common sense wisdom to devise something which can be used people at bottom of pyramid.

You know something doesn't mean that it's the end of world. Question is how you make use of it not only for yourself but to make the lives of others better. I think 'I knew it...' approach should be discarded if we ourselves have not made any use of it.. Growth in knowledge for the sake of it is a sign of cancer..

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Guru
Engineering Fields - Aerospace Engineering - Retired South Africa - Member - The Rainbow-nation Engineering Fields - Engineering Physics - Relativity & Cosmology Popular Science - Cosmology - The Big Picture!

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#2

Farm Fridge

06/04/2006 4:39 AM

I grew up on a farm where electricity was late in coming. This same design fridge (water through a form of porous coal) was used to keep milk, butter, fruits, vegetables, drinks etc. cool. Works very well if the wind is blowing to evaporate the water faster and thus cool the coal well below ambient.

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Commentator
France - Member - Blue Rabbit

Join Date: Apr 2006
Location: Douarnenez, Bretagne, France
Posts: 80
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#3

Evaporative Cooling...

06/04/2006 6:55 AM

... is no new thing - I remember a small cooler, a 5-sided box made from plaster, with a (polystyrene) insulated aluminium door, which went under thr lyrical name of 'The Osocool'. In the the top was a shallow depression for the water, which then soaked into the plaster box. I used a much simpler method in Asia, putting bottles of beer inside wet socks. A few bicycle miles later, the beer was cool. I had difficulty explaining latent heat of evaporation in Thai - and the local youth thought I was some kind of magician.

The coal appears to serve no special purpose in this example, indeed, if 'and then after it can be reused as fuel or any other way' the coal seems to play no important part in the device, other than offering a large evaporative surface. Gravel might work just as well, and without the possible toxicity of coal...

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France - Member - Blue Rabbit

Join Date: Apr 2006
Location: Douarnenez, Bretagne, France
Posts: 80
Good Answers: 1
#4

Methanol/Charcoal Refrigeration

06/04/2006 7:19 AM

Refrigeration systems without electricity are well proven. Other systems, using Zeolites and water, Lithium Bromide, or Ammonia, exist. Google around - Keywords: Adsorption (Wikipedia), Methanol + Refrigeration, Solar refrigeration...
Systems using photovoltaics and compressors, or Peltier devices, are unnecessarily complex and hi-tech.
Write to me if you are interested. I have designed parabolic collector/ Ammonia systems, more sophisticated than heaps of coal, but capable of making ice.

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"Experience is a combination of the mistakes we have made, and those which we have seen made by others..." simeonlapinbleu.googlepages.com/home
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Guru

Join Date: Feb 2006
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#5

Village Fridge

06/05/2006 7:04 AM

I almost agree with all the paticipents who commented. Cooling through evaporation is no new thing. In Pre-historic eras man had been gradully improving to beat heat for his confort & keeping his hunts & other needed food materials long-life. As late as 20th century, clay [mostly mud of soil] was used for water pichers which cooled water in dry summer [after march till the onset of Monsoons in Indo-Pakistan sub-contonent]. But in rainy seasons it all got useless as coolers. To keep rooms cool special grass panels were used in front of doors, keeping in mind the direction of wind or some hand driven coth-mounted on wood panel fans to get air moving in & out by drawing in to & fro. Late after the invention of oil-engines, those big fans coupled with rods in more than 6-7 rooms, through holes in partition walls were driven by an engine mounted at on end of the building. This facillity was for British Troops Barracks in then-India. Samples may still be seen in cantonments in India, Pakistan and Bangladesh ; though the installations may have been removed where new constructions are done. I amm the eye witness of such installations in Lahore Cantt [Pakistan] till 1953. The 1st non-electric Fridge, using Kerosine Oil burner to heat Amonia-solution, explioting convection cooling was given to Village Hospitals for prevention of life-saving medisons & Vaccines. The manufacturer was renownd American company [sorry I forgot the name; but I rember its suffix of -lux. Desrt cooler is well known device being used in deserts or dry locations in Saudi Arabia & other countries. It is the new version of desert coolers used by Nomads in desrts where wind was not a problem, but scarcity of platabl water. Camel skins were used as tents as well as soaked in non-platable water as cooling panels.

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