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Model predictive control for supervising multiple rooftop unit economizers to fully leverage free cooling energy resource
Applied Energy ( IF 11.2 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.apenergy.2020.115324
Donghun Kim , James E. Braun

“Free cooling” with cool outside air can meet or reduce a building’s cooling loads in an energy efficient manner when conditions are favorable. For rooftop air conditioning units (RTUs), this is achieved with air-side economizers that are integrated with the packaged RTU. However, current RTU economizers are independently controlled at the unit level and may not fully leverage the free resource for economic benefit especially when multiple units serve a common zone of a building, such as in retail stores. That is, the independent control of multiple RTUs could lead to some units operating with mechanical cooling even when the outdoor air temperature or enthalpy is low enough to meet the load with economizer cooling. This paper presents a model-predictive control (MPC) approach to optimally supervise multiple RTUs in order to fully utilize the free cooling resource. The algorithm is applied to the evaluation of the energy savings potential for a case study building served by four identical RTUs under various climate zones over a cooling season.



中文翻译:

模型预测控制,用于监督多个屋顶节能装置,以充分利用免费的冷却能源

在有利的条件下,以凉爽的外部空气进行“免费制冷”可以以节能的方式满足或减少建筑物的制冷负荷。对于屋顶空调单元(RTU),这是通过与包装的RTU集成在一起的空气侧节能器实现的。但是,当前的RTU省煤器在单元级别上受到独立控制,并且可能无法充分利用自由资源来获得经济利益,尤其是当多个单元服务于建筑物的公共区域时,例如在零售商店中。也就是说,即使当室外空气温度或焓低到足以满足节能器冷却的负荷时,对多个RTU的独立控制也可能导致某些设备采用机械冷却方式运行。本文提出了一种模型预测控制(MPC)方法,以对多个RTU进行最佳监管,从而充分利用自然冷却资源。该算法适用于评估案例研究大楼的节能潜力,该案例研究大楼由四个相同的RTU在冷却季节的不同气候区域下服务。

更新日期:2020-06-30
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