[Stoves] Need help in designing a small refrigerator for rural huts.

[Crispin Pemberton-Pigott]

Dear Anil

Is it not true that modern paraffin fridges use heat to flex a metal compressor?  

Perhaps a better question is, 'How does a modern paraffin-powered fridge work?'

The physics of it must be quite optimised by now. They are available as alternative power in South Africa. It might be much more expensive than you would guess, but they make large fridges that work on that system. 
The two other methods I can think of are thermo-acoustic refrigeration which can be quite simple and can have efficiencies similar to that of an air compressor (45%) as well as thermoelectric coolers which are used in recreational vehicles. 

There is a free downloadable computer programme available from Los Alamos Lab for the design of thermo-acoustic refrigeration units. Prof Steve Garrett, who sometimes can be found at ETHOS, wrote it +20 years ago. It will save you a great deal of work if you want to resign one. 

SCORE is working on one attached to a stove, and has been for several years. I haven't seen it work yet though. 

In operation you heat a sealed tube off centre and have cooling near the heating point. It rattles a high pressure wave back and forth. One end gets cold, like, -100 C. It is a form of Stirling engine, actually. 

Regards
Crispin
-----Original Message-----
From: nari phaltan <nariphaltan at gmail.com>
Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
Date: Fri, 18 Jan 2013 09:49:49 
To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
Reply-To: Discussion of biomass cooking stoves
	<stoves at lists.bioenergylists.org>
Subject: [Stoves] Need help in designing a small refrigerator for rural huts.

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