以效率區分法作為多台空調主機控制策略之研究

The Use of Efficiency Zoning as a Control Strategy for Multiple Chiller Systems

葉清華 ； 蔡尤溪

《冷凍空調與能源科技雜誌》 78期 (2012/12) Pp. 52-60

https://doi.org/10.7087/JEHVACE.201212.0052

摘要

空調主機在部分負載率（Part Load Ratio, PLR）之性能係數（Coefficient of Performance, COP）與滿載時有所不同，為了解其對多台主機系統能源效率之重要性，將空調主機之部分負載時，依其COP值百分比的不同來加以分區。其目的主要是在因應建物的空調負載變化時，使空調主機均能在高效率區運作。本研究選用台北市一個公有辦公類型建物為模擬案例，加以分析其全年空調負荷之月均值，空調主機容量及台數選用單台及雙台方式配置，在主機啟停策略則採用運轉百分比控制方式。本研究以案例分析全年各月空調平均負載及各主機運轉百分比下空調主機COP年均值，以作為建物於日後選用主機容量及台數控制的參考。研究發現在各月COP均值分區上，單台主機配置方式其COP月均值位於A區、B 區及C區均為4個月，最佳COP年均值則落於B區。但採用雙台主機配置方式其COP月均值位於A區有六個月，B區為3個月，C區為2個月，年COP均值亦落在B區。在COP年均值及全年COP與運轉時數（hr）乘積最佳均值表現上，雙台主機在建議之配比控制下，比單台主機之差異值分別為4.36%及9.37%。本研究成果所顯現之節能效果，可用於節能設計。

關鍵字

性能係數 ； 台數控制 ； 效率區 ； 節能分析

並列摘要

The COP of a water chiller at part load ratio is different from that at full load. The effects of the partial load control on the energy performance were investigated by separating the part load zones into different COP zones. The purpose is to control the chillers to operate in higher efficiency zones at partial cooling load conditions. This research used a typical building in Taipei as the building case. The monthly average air-conditioning load was first analyzed for the capacity required for the chillers, either one or two chiller in operation. Average monthly air-conditioning load was calculated for a building case. The annual average COP of the chillers was calculated at each range of partial load, for multiple chillers system control. It has been found that using the monthly average COP zone analysis, the single chiller control operates four months on zone A, zone B and zone C. The average annual COP falls on zone B. When two chillers are used in the control strategy, the monthly average COP falls on zone A for six months, zone B for four months, and zone C for three months. The annual average COP also falls on zone B. On the annual average COP, and the multiplier of COP and operation hours, the differences between two chillers and on chiller are respectively 4.36% and 9.37%. The energy saving potential can be used in the energy performance design.

並列關鍵字

COP ； chillers control ； efficiency zone ； energy analysis