Originally Posted by missourisailor
The problem that I have with his test is that he has changed TWO variables.
ONE - Holding plaste vs thin plate
TWO - orifice vs expansion valve.
I'm wondering if most of the reduced Ah's is not because of the holding plate but has more to do with the use of an expansion valve?
The two variables often confuse people.
The holding plate gets you a few benefits:
The ability to "store cold" inside your box to have a dramatically difference on the compressor
cycle times. Take a look at this graph, below from a Box test. The compressor
running a holding plate system turns on/off 4 time in a 24hr period, while the compressor running a thin rolled aluminum
evaporation plate turned on/off over 150 times in that same 24hr period. Same box, same test conditions and a lot less wear and tear and start-up wasted amp draw as the compressor doing nothing until it builds up pressures. Now if you don't think cycling your compressor 4 times in 24hr is better than +150 times then, hey...that's your call. You don't think there is a coincidence that we are the only company to offer a 5hr warranty and this difference in compressor (and electronic control box) cycling do you....
Image No 1 CoolBlue Temps/Compressor Cycle Profile:
Image No 2 Thin Rolled Aluminum
Now Mr Kollmann says:
or solution of liquids are phase changed to a solid form by freezing it then becomes an insulator reducing its effect as an efficient evaporator." But is that true...well maybe it is on the Holding plate systems he has build and has experience with, but CoolBlue is the only holding plate manufacturer that doesn't just put a coil of copper tubes inside their holding plates or this statement would be true. But inside of our holding plates is this photo
below. A massive aluminum fin/tube condenser. The surfaces area is massive and it allows for a very efficient heat transfer between the eutectic solution and the refrigerant gas.
Image No 3 Fin/Tube Holding Plate
Now back to the Critical Orifice vs the Thermally adjusting expansion valve. That is where a big portion of the increased efficiency comes from. As I discussed in detail in an above post, this lets the refrigeration
volume go from around 4-5oz up to 24oz letting us increase our condenser and take out more heat. But it is also a much more efficient way to run the evaporator.
So our increased efficiency is a combination of the two system differences.
Now, why are not more people making holding plate systems?
That's easy...the COST.
But there are other manufacturers: SeaFrost, Isotherm
Holding plate systems simply cost more to build in parts
and labor, and that translates into an increased sales price
. Sure we could be like everyone else and go for the bottom dollar and have an evaporation thin rolled system stamped out in China
and our net cost of production would go down 3X. So if Cost is your main driver, there are plenty of low cost systems out there on the market for you. But that is not our nitch. Since 1968 (longer than any other marine refrigeration
company by the way...that ain't an accident) we have targeted the efficiency/quality build segment of the cruising market. You pay more upfront but save power on the back end along with the simple fact that there is not another manufacturer that gives a warranty and customer service
like we do. Try to talk to and ask questions and get 7 day a week customer service
from the owner of the other made in China/Corporate brands and see how that goes....good luck.