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建築環境工学 建築伝熱1
1.
伝熱 • 伝導 Heat
conduction –固体中の伝熱 • 熱伝達 heat transfer –壁表面の伝熱 –対流熱伝達:壁に接する空気 –Convectional heat transfer –放射熱伝達:電磁波(赤外線) –Radiation heat transfer
2.
定常状態 Steady state •
時間変化のない状態 – この講義では定常状態を扱う • 非定常状態 Transient – 時間変化のある状態
3.
伝導 Heat conduction d tt q
21 tyconductiviThermal ]K)W/(m[: 熱伝導率 熱流 heat flux : q [W/m2] 物質に固有の値 ラムダ
4.
熱伝導率 Thermal conductivity • 金属が大きく,気体が小さい •
コンクリート = 1.6 [W/(m・K)] • 木材 = 0.15 [W/(m・K)] • グラスウール =0.04[W/(m・K)] • 断熱材 Insulation material • λ < 0.06 [W/(m・K)]
5.
密度と熱伝導率 Density and Thermal
conductivity 対数目盛 密度の小さいもの (軽いもの) 小
6.
細かい空隙 熱伝導率の小さい 気体を含むと小さくなる 動き回れない
7.
熱伝導率 • 水分を含むと熱伝導率は大き くなる –水 =
0.6 [W/m・K] –空気 = 0.022 [W/m・K]
8.
熱伝達 壁表面からの伝熱
9.
対流 convection • 流体(空気、水)が流動する場合 •
自然対流 Natural convection
10.
絶対零度(-273℃) 以上の物体の表 面から、放射に より熱エネル ギーが放出され る 熱放射 Radiation
11.
熱伝達 sarr ttq s t a t 外気温度または室温 壁表面温度 sacc ttq sa sacrcr tt ttqqq
)( 放射熱伝達 qr 対流熱伝達 qc
12.
設計用熱伝達率 • 室内外で値が違う
13.
熱伝導抵抗 Resistance of heat
conduction • 熱伝導率 (thermal conductivity) → 物質できまる 厚壁薄壁 どちらも熱伝導率は同じ • 厚さを考慮→熱伝導抵抗
14.
21 21 tt dd tt q d : 材料の厚さ
[ m ] λ : 熱伝導率 [ W/(m K)] d r 熱伝導抵抗の算出式
15.
中空層
16.
1 t 2 t ? air r tt q 21 air r
熱抵抗
17.
熱抵抗の値 空気層が 2~5cmを 超えると値 は変わらな い
18.
熱抵抗の設計値 • 金属材料(アルミ箔等)を入れると倍 になる
19.
熱貫流率 K Coefficient of
overall heat transmission t1 t2 21 ttKq
20.
熱貫流抵抗 R Resistance of
overall heat transmission R K 1 oni rrrrrR 21
21.
熱貫流抵抗 R • 室内側熱伝達抵抗、室外側熱伝達抵抗 •
各部材の熱伝導抵抗 • 空気層の熱伝導抵抗 • 熱貫流抵抗 • 熱貫流率
22.
~率と~抵抗 • ~率は熱の通しやすさ • ~抵抗は熱の通しにくさ •
熱伝導率が大きい – 熱を良く通す物質 • 熱伝導抵抗が大きい – 熱を通さない • 抵抗は合計ができる
23.
熱貫流率の例
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