radiation setting, how?

Hi,

In the solar radiation model mentioned that:

specular transmissivity + diffuse transmissivity + specular reflectivity + diffuse reflectivity + absorptivity = 1

The questions are:

1) In Acuconsole, absorptivity does not need to specify. So, is it means that it is automatically generated based on above equation?

E.g: 0.5+0+0.2+0+absorptivity=1

Is it means that absorptivity value automatically = 0.3??

2) Is it emissivity value must be equal to absorptivity value??

Thanks

Sorry for my english..

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1. Yes absorptivity is the rest of the equation, as you mentioned

2. AcuSolve takes absoprtivity = emissivity and hence you once specify emissivity

1. Yes absorptivity is the rest of the equation, as you mentioned

2. AcuSolve takes absoprtivity = emissivity and hence you once specify emissivity

Regarding question 2, if we setup specular transmissivity = 0.35, specular reflectivity = 0.05 and emissivity = 0.6

what is value of absorptivity?

Thanks

Regarding question 2, if we setup specular transmissivity = 0.35, specular reflectivity = 0.05 and emissivity = 0.6

what is value of absorptivity?

Thanks

For solar radiation model, absorptivity would be calculated from the rest of the equation

i.e. 1- Transsivities - reflectivities (page 63 of Command reference manual)

For enclosure radiation mode, absorptivity would be equal to emissivity. (Kirchhoff Law and gray surface assumption, Pg 56 CRM)