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Body Radiation
放射伝熱の集中熱要素
The Body Radiation component models the thermal radiation emitted between two bodies as a result of their temperatures. The following constitutive equation is used:
where is the radiation conductance and is the Stefan-Boltzmann constant. can be determined by the measurements; this value is assumed to be constant over the range of operations.
In simple cases, may be analytically computed. The analytical equations use , the emission value of a body, which is if the body absorbs all radiation (black body), or if the body reflects and does not absorb radiation.
の一般的な各値は次のようになります:
材質
値
アルミニウム、研磨済み
0.04
銅、研磨済み
金、研磨済み
0.02
紙
0.09
ゴム
0.95
銀、研磨済み
木材
0.85 .. 0.9
の解析方程式
大きな筺体内に小さい凸状のオブジェクトがある場合 (室内に置かれた電熱器など):
: オブジェクトの放射値 (0..1)
A: 放射熱が発生するオブジェクトの表面領域
2 つの並行する面:
: 面 1 (0..1) の放射値
: 平面2 (0..1) の放射値
A : 面1 (= 面 2 の領域)
2 つの長さのある同心円筒 (内側の円筒から外側の円筒に放射が発生):
r1: 内側の円筒の放射
r2: 外側の円筒の放射
L : 2 つの円筒の長さ
: 内側の円筒 (0..1) の放射値
: 外側の円筒 (0..1) の放射値
パラメータ
記号
デフォルト
単位
説明
ID
-
2 つの表面間の正味放射伝導性
Gr
変数
Temperature at port
初期条件
W
Heat flow rate from to
Initial temperature difference
参照
熱力学の概要
このトピックで説明したコンポーネントの出典は Modelica Standard Library です。著作権情報を含むオリジナル文献を参照するには、ここ をクリックしてください。
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