General > Beating a dead horse
VORTEX Spas from Canada
Spatech_tuo:
--- Quote from: Vortex Spas Canada on August 19, 2013, 08:10:15 pm ---From what we have tested , when its below -10 degress celcius outside our perimeter insulation is drasticly more efficient . You are right to say that full foam is a little bit more efficient when its above -10 outside but just the fact to not see whats going on with your plumbing, the fact that a perimeter insulation reduce the hearing of the pump noise is 2 good reasons for me to choose that insulation indtead of foam . When you choose the right components and dont insert cheap material in your spa you should not have any problem with a perimeter insulation . Have you experienced any issue wihthat type of insulation?
--- End quote ---
I don't beleive its more efficient let alone "drastically" but the key point is without data many here will find such claims as just salesmanship. Also, if I want to reduce noise I'd get a spa with a circ pump rather than having to hear the main pump filtering for 6 hours a day.
vangoghsear:
A 69% efficient 2 hp pump (avg) will put almost 44000 btu into that insulated airspace over 6 hours of operation. If the R value of the insulation limits the losses through the shell to less than that over a 24 hour period, the air space between the insulation and the tub will rise in temperature and when that air space is hotter than the water, the tub water will gain heat. That is pure waste heat so the claim of high efficiency depends largely on the insulating value of the barrier insulation.
The barrier insulation tub does not have to be as well insulated as the full foam tub, it just has to capture enough waste heat to limit the total losses to less than that of a full foam insulated tub that does not capture any waste heat (or minimal waste heat through the equipment cavity wall).
Dr. Spa™ Ret.:
fyi..........44000 btu's over 6 hours is equal to just over 2 kW per hour.
vangoghsear:
--- Quote from: Dr. Spa™ on August 20, 2013, 05:16:35 pm ---fyi..........44000 btu's over 6 hours is equal to just over 2 kW per hour.
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That's correct. A 69% eff 2hp motor puts out about 3650 btu per hp into a space when the motor is contained in that space. 1 btu = .293 watts so 3650 x .293 = 1069 watts x 2 hp = 2138 watts per hour.
Tman122:
Lots of people come here with claims of perimeter insulation superiority. Lots of people with pipe dreams and a sales pitch. But it truly is easier to repair the 1% of leaks that happen in the foam insulation. Not sure if the 5-15 bucks a month more in electric cost's makes it a good value as insurance for a very very unlikely leak.
Just some random thoughts.
I think shoppers need to make sure their purchase is well insulated.
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