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   Engineering Data

Conversions

Insolation Data of Major America Cities

 

 

 

 

Additional data

 

In temperate zone

1 sq. meter solar collector area receives approx. 1.1KW of solar energy

TRX 's Cu-N/AL type panel  collects 60% or 600 watts of heat .

The other Al-N/AL type panel  collects 40% or 400 watts of heat   .

 TRX's Cu-N/Al evacuated tubes yields average 1.74 Kw-Hr /m2/day   or 551 BTU/ft2/day

TRX's Cu-N/Al tubes absorbs up to  22 % more solar heat and loses 30% less heat through emission than Al-N/Al tubes .

TRX's evacuated glass tube is made from High Boron Silicate Glass with sunlight transmittance value of 91% ,

In TRX evacuated tubes , sunlight transmittance of Boron Silicate glass is further increased from 91% to 96% by the additional  SiO2 gel solution with TRX proprietary gel condensation technology applied on the outer surface of the vacuum tube .

 

 
 

Unit Conversion

 

  • 1 kWh/m2/day = 317.1 Btu/ft2/day
  • 1 therm = 29.3kWh = 100,000Btu = 105.5MJ
  • 1 kWh = 3412Btu
  •  
  • Thermal Conductivity  
  •      1 W/m K = 0.5778 btu/h ft.F
  •                       = 6.93 btu in/ft2 hr.F
  •                       = 0.86 kcal / m hour K
  •                       = 0.169 watts / ft. F
  •                       = 0.01  joules / cm sec. K
  •                       = 0.01  watts / cm K
  •                   = 0.00239 calories / cm sec. K
  •  
  • R- value Calculation
  •      R = 1/ C 
  •      C = Thermal conductance K / thickness in inches
  •      Thermal Conductance K in (Btu in. / ft. hour F)
  •  
  • 1 Liter/min = 0.264    US gpm
  • 1 Liter/Hr    = 0.0044 US gpm
  •  
  • 1 bar = 1.02kg/cm2 = 14.5psi = 100kPa =10m water head
  •  
  • F = (oC x 9/5) + 32
    C = (oF - 32)X5/9
  •  
  • 1 meter = 1000mm = 39.37 inches=3.28 ft


     
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