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Code Manual for CONTAIN 2.0 - Federation of American Scientists

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14.3.1.5 Radiation. The radiation model is activated at the cell level by the keyword RAD-HEAT.<br />

In the following descriptions, “nhtm” is the number <strong>of</strong> heat transfer structures in the cell as specified ~<br />

in the cell CONTROL block.<br />

***** ***** ***** ***** ***** ************************************************<br />

RAD-HEAT<br />

[EMSVT (emsvt)]<br />

[CESS]<br />

[{ABSORB absorb or KMX kmx}]<br />

{ENCLOS<br />

VUFAC (vufacn) [BEAML (bead)]<br />

EOI<br />

or<br />

GASWAL gaswal<br />

EOI<br />

GEOB~geobl)}<br />

***** ***** ***** ***** ***** ************************************************<br />

The following keywords control the gas and surface emissivities:<br />

RAD-HEAT the keyword to begin the specification <strong>of</strong> the radiation model in the cell. ~<br />

EMSVT the keyword to begin the specification <strong>of</strong> the dry surface emissivities.<br />

emsvt the dry surface emissivity. Specify “nhtm” values if no lower cell is<br />

present. Specify “nhtm”+l values if a lower cell model is logically<br />

present in the cell, with the last value equated to ernissivity, <strong>of</strong> the<br />

uppermost lower cell layer. (The atmosphere or null layers are not taken<br />

into account in determining this layer.) A lower cell is logically present<br />

if space has been reserved <strong>for</strong> the lower cell model; i. e., if “jint” +<br />

“jpool” + “jconc” is greater than O. Specify an effective emissivity if the<br />

GASWAL option is chosen (see the discussion after Equation (10-64);<br />

otherwise, specify a proper dry surface emissivity. If water is present on<br />

a surface, a value <strong>of</strong> 0.94 is used <strong>for</strong> the ernissivity with the net enclosure<br />

model and a value (1 + 0.94)/2 with the GASWAL option. If “emsvt” is<br />

not specified, all dry surface ernissivities default to a value <strong>of</strong> 0.8.<br />

CESS the keyword specifying use <strong>of</strong> the Cess-Lian correlation <strong>for</strong> the steam<br />

ernittance (see Section 10.3.3.2). If this option is activated, carbon<br />

dioxide and carbon monoxide are treated as transparent gases and<br />

there<strong>for</strong>e do not participate in the radiative heat transfer. If CESS is not<br />

specified, the default Modak model is used <strong>for</strong> the gas emittance.<br />

Rev O 14-94 6/30/97

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