Flat plate vs. evacuated tube solar hot water collectors
Solar hot water has come a long way in the last decade, particularly with the introduction of evacuated tube collectors which are rapidly becoming the preferred option over flat plate systems. If you're not sure of the difference between the two in terms of how they work, read our brief
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The latest is certainly not always the greatest, so so which is actually better - a flat plate solar hot water system or one that uses evacuated tube collectors? While evacuated tube technology is more of an investment, the benefits certainly outweigh the cost! Any additional cost may also be offset by solar hot water rebates!

Evacuated tube collector based systems:

Capture sunlight better as they have a greater surface area exposed to the sun at any time
Are more efficient in transferring heat - up to 163% demonstrated in Australian conditions!
Can be used in subzero temperatures
Are durable and if a tube should be broken, it can be easily and cheaply replaced.
Provide excellent performance in overcast conditions
Require a smaller roof area than comparable flat plate collectors
Do not have the same level of corrosion problems as flat plate collectors


Collector efficiency comparisons
The results below speak for themselves as to the improved efficiency of evacuated tube technology over flat plate collector solar hot water systems.

The following figures demonstrate efficiencies of collectors when heating water from ambient temperature to 75 degrees Celcius - data provided by Hi Temp Solar. Flate Plate Collector efficiency testing was performed at National Solar Test Facility Canada.


Durban, South Africa
Winter: Based upon solar insulation of 426W/m2 and an ambient temperature of 13.1degrees Celsius in Durban, the Hi Temp evacuated tube solar collector is on Average 104% more efficient per m2 of aperture compared to flat plate solar collector.**

Summer: Based upon solar insulation of 840W/m2 and an ambient temperature of 21.3 degrees Celsius in Durban, the Hi Temp evacuated tube solar collector is on Average 50.5% more efficient per m2 of aperture.**

Winter: Based upon solar insulation of 296W/m2 and an ambient temperature of 9.9 degrees Celsius in Cape Town, the Hi Temp evacuated tube solar collector is on Average 163.5% more efficient per m2 of aperture over the flat plate solar collector.**

Summer: Based upon solar insolation of 861W/m2 and an ambient temperature of 19.8 degrees Celsius in Cape Town, the Hi Temp evacuated tube solar collector is on average 51.5% more efficient..**

Centurion, Pretoria
Winter: Based upon solar insolation of 546W/m2 and an ambient temperature of 17.8 degrees Celsius in Centurion, the Hi Temp evacuated tube solar collector is on average 81% more efficient per m2 of aperture compared to the flat plate solar collector.**

Summer: Based upon solar insolation of 828W/m2 and an ambient temperature of 25.2 degrees Celsius in Centurion, the Hi Temp evacuated tube solar collector is on Average 54% more efficient.**

A correctly installed solar hot water system can start saving you money straight away, while doing your bit towards a lower carbon footprint. Contact us today via email or visit
0828003215 Dominic
http://www.kwiksolar.co.za