The Terminal Reheat Systems
终端再热系统
The constant volume terminal reheat system is one of the oldest central air handling systems developed to rve multiple occupied spaces requiring independent controls. A schematic diagram of such a system with an economizer cycle is shown in Figure 8.1.
定容终端再热系统是是一门古老的中央空调系统被开发来服务于多个空间要求独立的控制之一. 省煤器循环这一系统的原理图图 8.1 所示。
In designing any air handling system, after the cooling loads are determined for conditioned spaces, the design engineer generally calculates a t of values for supply air quantities, CFMs, for the conditioned spaces using Eq. (2.2) to satisfy the peak cooling load of the space. By definition, a constant volume terminal reheat system will have to supply the calculated air quantity to all conditioned spaces at all times. In addition, all the supply air will have to be cooled to a sufficiently lower temperature so that when any thermostatically
controlled space reaches its design peak cooling load, the temperature of the supply air from the central air handling system can satisfy its need.
运动会开幕式 在设计任何空气处理系统，确定冷却负荷条件的空间后设计工程师通常计算一组值空间的供水空气量为条件，以满足高峰期冷负荷的空间使用 Eq.(2.2)，工作反思周一的英文CFMs。江虾 根据定义，定容终端再热系统将不得不时刻供应所有空间计算的空气量。因此，所有供应空气都会被冷却到足够低的温度，所以，当任何恒温控制的空间达到顶峰设计冷负荷，从中央空气处理系统供应空气的温度可以满足其需要。
To meet this requirement, a constant volume terminal reheat system us a central cooling coil and a supply fan that provides fixed air quantity at a constant temperature. A thermostat is placed at the discharge of the air handling unit controlling the cooling coil capacity to maintain the supply air temperature.
为了满足这一要求，终端再热系统采用中央冷却盘管和风扇，在某一恒定温度固定空气量提供恒定体积。恒温器位于排放的空气处理设备来控制冷却盘管能力，以保持供应空气温度。
Note that for any given time, there will only be a few spaces that will reach their cooling design peaks. The remainder of the spaces will all be operating under a partial load condition, which can be satisfied with supply air temperatures higher than that supplied from the central air handling system. Since all the supply air has to be cooled down to DT degrees (e Eq. 2.2) below the room temperature to satisfy theworst-ca space condition, the refrigeration load will have to be higher than what the building needs at any given time.
请注意，任何时候，只会有少数空间，其散热设计将达到高峰。剩下的空间都将在下一个部分负荷条件下操作,可以满足送风温度高于从中央空调系统提供的温度。由于所有的供应空气冷却到 DT 度 (见表 2.2) 低于室温来满足最坏情况下的空间条件下室内温度，制冷负荷都要高于任何建设需要在任何给定的条件。
For all spaces that do not require full cooling, supplying the constant amounts of cold air without any modification to the supply air temperature will overcool the spaces. To satisfy a space that does not need full cooling, a heating source is added in the branch d
uct rving the space to "reheat" the supply air up to a higher temperature. For each space requiring independent temperature control, a room thermostat will control a heating coil or an electric heater located in the branch duct, usually in a terminal unit rving the space, to modify the supply air temperature to satisfy the room needs. Note that all spaces under partial load condition will require varying degrees of reheat, which reprents additional heating energy otherwi not required under a cooling mode. This added heating energy is considered as energy waste necessary to make the constant volume terminal reheat system functional.
竹组词语>恳求造句>三只小乌龟的故事对于所有空间，不需要全面降温，而无需任何改动送风温度恒定量去冷却这些空间。为了满足一个空间，并不需要充分冷却，加热源分支中添加了服务的空间，“再热”的送风将到达一个较高的温度管。为每个空间，要求独立的温度控制，室内温控器将控制加热线圈或电加热器，位于分支风道，通常在终端服务的空间，以满足需求的房间供应的空气温度。 请注意部分负荷条件下的所有空间将都需要不同程度的热，表示不需要冷却模式下的其他加热能源。这种附加加热的能量被认为是能源必要浪费的终端再热系统功能
丁丁网
The constant volume terminal reheat system was a commonly ud system in the 1940s through early 1960s. At the time, not only was energy plentiful, but utility companies also encouraged customers to u energy for better comfort. However, once energy conrvation became an important issue, very few of the constant volume terminal reheat systems were suitably efficient to be ud for ordinary air-conditioning. Today, new and existing buildings using constant volume terminal reheat systems are often designed or retrofitted with control schemes that will, instead of fixing the supply air temperature from the air handling unit, u load-analyzing logic to ret the supply air temperature higher to satisfy the space requiring the most cooling during partial cooling conditions.
