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圖4顯示了帶有熱水盤管的空氣處理系統(tǒng)。類似的控制方案也適用于蒸汽盤管。如果選擇蒸汽或熱水來分配熱能，可以使用高效鍋爐來降低壽命周期成本。水通常比蒸汽更常用于將熱能從鍋爐傳輸?shù)奖P管或終端裝置，因?yàn)樗枰^少的安全措施，通常效率更高，尤其是在溫和的氣候條件下。恒溫器熱水供應(yīng)閥排氣風(fēng)扇熱水回流C2702圖4。使用加熱盤管的系統(tǒng)?？諝馓幚硐到y(tǒng)通過將氣流穿過包含加熱介質(zhì)的盤管、電加熱盤管或熔爐來提供熱量。單元加熱器（圖5）通常用于商店、儲(chǔ)存區(qū)、樓梯間和碼頭。面板加熱器（圖6）通常用于加熱地板，通常安裝在樓板或地板結(jié)構(gòu)中，但也可以安裝在墻壁或天花板中。C2703單元加熱器盤管風(fēng)機(jī)蒸汽或熱水供應(yīng)冷凝水或熱水回水疏水閥（如果蒸汽供應(yīng)）圖5。典型的單元加熱器。C3035排氣壁室外空氣混合風(fēng)門回風(fēng)冷卻盤管排水盤加熱盤管風(fēng)機(jī)圖6。面板加熱器。單元通風(fēng)機(jī)（圖7）用于教室，可包括加熱和冷卻盤管。對(duì)流加熱器（圖8）用于周邊加熱以及入口和走廊。紅外加熱器（圖9）通常用于大面積（如飛機(jī)吊架、體育場(chǎng)）的局部加熱。

Figure 4 shows an air handling system with a hot water coil. A similar control scheme would apply to a steam coil. If steam or hot water is chosen to distribute the heat energy, highefficiency boilers may be used to reduce life-cycle cost. Water generally is used more often than steam to transmit heat energy from the boiler to the coils or terminal units, because water requires fewer safety measures and is typically more efficient, especially in mild climates. THERMOSTAT HOT WATER SUPPLY VALVE DISCHARGE AIR FAN HOT WATER RETURN C2702 Fig. 4. System Using Heating Coil. An air handling system provides heat by moving an air stream across a coil containing a heating medium, across an electric heating coil, or through a furnace. Unit heaters (Fig. 5) are typically used in shops, storage areas, stairwells, and docks. Panel heaters (Fig. 6) are typically used for heating floors and are usually installed in a slab or floor structure, but may be installed in a wall or ceiling. C2703 UNIT HEATER COIL FAN STEAM OR HOT WATER SUPPLY CONDENSATE OR HOT WATER RETURN STEAM TRAP (IF STEAM SUPPLY) Fig. 5. Typical Unit Heater. C3035 DISCHARGE AIR WALL OUTDOOR AIR MIXING DAMPERS RETURN AIR COOLING COIL DRAIN PAN HEATING COIL FAN Fig. 6. Panel Heaters. Unit ventilators (Fig. 7) are used in classrooms and may include both a heating and a cooling coil. Convection heaters (Fig. 8) are used for perimeter heating and in entries and corridors. Infrared heaters (Fig. 9) are typically used for spot heating in large areas (e.g., aircraft hangers, stadiums).