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Cowboy Sailer · 14-02-2008, 01:10

Gord,

At this level of engineering I think that power consumed and COP are better descriptions of cooling performance than the cubic capacity of the cooler. Portable coolers have very poor insulation. What do you think; maybe R=5? With a suitably insulated top loading box a 40 watt cooler with a COP = 2 might cool a few cubic feet. What do you think is reasonable for an R value for such a box, R=20? That would imply three or four cubic feet of capacity.
The next factor is that the performance curves show that the Stirling cooler has better low temperature performance than the Rankin cycle. Indeed, they are useable as cryostats. So the performance advantages for use as a deep freeze may be quite a bit more for the Stirling.
The next point that may affect power consumption is that the Stirling cooling may be modulated over a large range. This may offer another advantage over on/off temperature control that has always been used on ordinary freezers.
I gather that Global Cooling does not manufacture any consumer products. They only make a cooling device that the trade may incorporate into their products. That is why a demonstration to a specific market segment (i.e. the boating industry) may be something that they may be interested in supporting.
I thought that as an administrator for this forum you might have the necessary credentials to get them to supply an evaluation unit to someone who could field test its suitability in a marine deep freeze application.
Is anybody in this forum interested in doing such a field test? It would need to be a well controlled and documented professional test.

Jerry

14-02-2008, 01:10	#21
Cowboy Sailer Registered User Join Date: Aug 2007 Location: on the boat. Presently Seabrook, Texas Boat: C&C 38' Oceans 15 Posts: 168	We need a test of performance Gord, At this level of engineering I think that power consumed and COP are better descriptions of cooling performance than the cubic capacity of the cooler. Portable coolers have very poor insulation. What do you think; maybe R=5? With a suitably insulated top loading box a 40 watt cooler with a COP = 2 might cool a few cubic feet. What do you think is reasonable for an R value for such a box, R=20? That would imply three or four cubic feet of capacity. The next factor is that the performance curves show that the Stirling cooler has better low temperature performance than the Rankin cycle. Indeed, they are useable as cryostats. So the performance advantages for use as a deep freeze may be quite a bit more for the Stirling. The next point that may affect power consumption is that the Stirling cooling may be modulated over a large range. This may offer another advantage over on/off temperature control that has always been used on ordinary freezers. I gather that Global Cooling does not manufacture any consumer products. They only make a cooling device that the trade may incorporate into their products. That is why a demonstration to a specific market segment (i.e. the boating industry) may be something that they may be interested in supporting. I thought that as an administrator for this forum you might have the necessary credentials to get them to supply an evaluation unit to someone who could field test its suitability in a marine deep freeze application. Is anybody in this forum interested in doing such a field test? It would need to be a well controlled and documented professional test. Jerry __________________ Jerry and Denver New cruisers!