TRX
Solar |
| Collector Evacuated Tube Type |
| Collector Flat Plate Type |
| DHW System Components |
| Thermosyphon Type Water Heater |
| Evacuated Tubes |
| Cu-N/AL Selective Coating |
| Installation Photos |
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Co-Chance |
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Alpheus A*PEX |
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Others |
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Technical Support |
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TRX Selective Coatings |
| TRX offers two types of Selective Coatings using PVD method
These coatings are applied onto substrate surface by
a pollution free PVD (Physical Vapor Deposition) process . The
advanced in-line process monitoring and quality control system is a joint
development work between Germany ISE and TRX .
This system ensu 4 layers TRX system |
The common selective coating offers by other manufacturers using PVD process is AL-N/AL system . It normally has 9 to 15 layers of Aluminum based cermet . Each layer has different concentration of cermet to absorb specific spectrum of sun energy . AL is not stable in high temperature and the migration of AL molecules between layers is the main reason for the degradation of performance . The TRX choice of using Cu or Mo in metal matrix composite is significant as these elements are extremely stable in high temperature environment . Each cermet layer is separated by a transparent Al2O3 film to prevent cross migration of cermet concentration at high temperature . It's photo-thermo conversion efficiency remains stable even after prolonged exposure in high temperature environment and they are rated to have minimum of 15 years to over 30 years of service life with peak performance . The resultant TRX selective coating is a full-spectrum absorption coating , capable of absorbing 92 to 96% of sun radiation energy in visible light and infrared band ( 0.38-1.5μm ), and is workable in all weather conditions. The emission rate is extremely low , between 5 to 7% for λ≥1.5μm ( 150 C) TRX is the leader in this kind of high performance selective coating technology . 25% of European high end evacuated tube market is produced by TRX . Besides the tubes , TRX also provides coating service for flat plate collector manufacturers under OEM agreements . |
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Cu- N/AL Performance Curves
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Mo-Al2O3 Performance Curves
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Temperature Efficiency Curve Tm = Mean Temperature of fluid in the collector Ta = Ambient Temperature G = Solar irradiance taken as 800 watt/m2
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Applications TRX selective coatings can be applied on any substrate surface like glass or metal . Its stability in high temperature environment ensures peak conversion performance is maintained and long service life is expected
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It is ideal for applications that require high temperature heat collection like parabolic concentrators . | ||||||||||||||||||||||||||||||||||||||||||
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Flat Plate Collector
α = 92-95
Є = 15-35
With Cu-N/AL
α = 92-95
Є = 5-7 |
Evacuated Tube Collector With
Al-N/AL
α = 82-95 Є = 8 -15 With Cu-N/AL α = 95.2 Є =5.6 |
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Advantages of TRX Selective Coating
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res
consistency in performance
and uniformity in quality in all its coated products
. In comparison , Black Chrome coating uses
electroplating process which causes serious pollution problem , while other
evacuated tube manufacturers use PVD process with poorer process control . TRX selective coating consists of 4 layers , the metal infrared
reflector layer , HMVF Cermet layer ( absorbs 70% of energy ) , LMVF cermet
layer ( 20% ) and the top anti-reflection layer ( absorbs remaining 3
to 5% ) . 
