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在溫和的氣候條件下，可以通過中央空氣處理系統(tǒng)中的盤管或熱泵提供熱量。熱泵的優(yōu)點是可以根據(jù)需要在加熱和冷卻模式之間切換。屋頂單元提供成套供暖和制冷。屋頂單元的加熱通常由燃氣或燃油爐或電熱盤管進行。蒸汽和熱水盤管也可用。在較冷的氣候條件下，尤其是在大型窗戶下，通常需要外圍加熱。熱泵使用標準制冷組件和換向閥在同一單元內(nèi)提供加熱和冷卻。在加熱模式下，通過盤管的制冷劑流反向流動，將熱量從熱源輸送到空調(diào)空間。當使用熱泵將建筑內(nèi)部的熱量交換到周邊時，不需要額外的熱源。熱回收系統(tǒng)通常用于使用大量室外空氣的建筑物。有幾種類型的熱回收系統(tǒng)可用，包括熱泵、試車系統(tǒng)、旋轉(zhuǎn)熱交換器和熱管。在狹條排印系統(tǒng)中，盤管安裝在室外送風管道和排氣管道中。泵使介質(zhì)（水或乙二醇）在盤管之間循環(huán)，以便由排氣加熱的介質(zhì)預熱進入系統(tǒng)的室外空氣。旋轉(zhuǎn)式熱交換器是一種填充有金屬網(wǎng)的大輪子。車輪的一半位于室外進氣口中，另一半位于排氣管中。當車輪旋轉(zhuǎn)時，金屬網(wǎng)吸收排氣中的熱量并在進氣中散熱。
In mild climates, heat can be provided by a coil in the central air handling system or by a heat pump. Heat pumps have the advantage of switching between heating and cooling modes as required. Rooftop units provide packaged heating and cooling. Heating in a rooftop unit is usually by a gas- or oilfired furnace or an electric heat coil. Steam and hot water coils are available as well. Perimeter heat is often required in colder climates, particularly under large windows. A heat pump uses standard refrigeration components and a reversing valve to provide both heating and cooling within the same unit. In the heating mode, the flow of refrigerant through the coils is reversed to deliver heat from a heat source to the conditioned space. When a heat pump is used to exchange heat from the interior of a building to the perimeter, no additional heat source is needed. A heat-recovery system is often used in buildings where a significant quantity of outdoor air is used. Several types of heat-recovery systems are available including heat pumps, runaround systems, rotary heat exchangers, and heat pipes. In a runaround system, coils are installed in the outdoor air supply duct and the exhaust air duct. A pump circulates the medium (water or glycol) between the coils so that medium heated by the exhaust air preheats the outdoor air entering the system. A rotary heat exchanger is a large wheel filled with metal mesh. One half of the wheel is in the outdoor air intake and the other half, in the exhaust air duct. As the wheel rotates, the metal mesh absorbs heat from the exhaust air and dissipates it in the intake air.
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