The lower the pressure level of the compressed air generated, the more cost effective the production. However, it is necessary to ensure that all active consumers are supplied with sufficient compressed air at all times. Improved control systems make it possible to reduce peak pressure. In principle, there are several ways to ‘narrow’ the pressure ranges, thus reducing the pressure of the compressed air generated. These possibilities are listed below and illustrated in Figure 3.35:
●direct readjustment via mechanical switches o n t he compressors. The cheapest way t o adjust the pressure range of a compressor is to use mechanical pressure switches. Since the setting sometimes changes by itself, these control switches have to be readjusted from time to time
●intelligent control using a frequency converter compressor or optimal compressor size. The pressure range is readjusted by means of a frequency converter compressor functioning as a peak load compressor and adapting its speed drives to specific compressed air needs, or by means of a master control which switches to a compressor of the most appropriate size
●reduction of the pressure range right to the ‘limit’ (optimised intelligent control). The intelligent control system reduces the pressure range to the point which allows the compressor network to operate just above the limit of under supply. Figure 3.34 shows different efficiencies of those control systems.

壓縮空氣產出的壓力水準越低，生產成本效益越大。但必須先確認所有線上作業使用的壓縮空氣壓力必須全時足夠。改善控制系統可以消弭尖峰壓力，原則上有些方法可使壓力區間縮小，這樣可使壓縮空氣產生的壓力降低。這些可行方法如下：
●直接調整壓縮機上的機械開關(壓力開關)：使用壓力開關調整壓縮機的壓力區間是最簡單的方法。因為設定值有時會跑掉，所以要經常校對與調整壓力控制開關。
●使用一套變頻壓縮機作智慧控制或使用優化的壓縮機規格控制：使用一台變頻壓縮機擔任尖載任務壓縮機來調整壓力區間，同時調適其轉速以供應特別需要的壓縮空氣量，或利用主控系統切換到最合適規格的壓縮機來供應。
●減少壓力區間到一最低範圍(優化的智慧型控制)：智慧型控制系統減低其壓力區間至允許壓縮機群在供應下限操作。

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The VSD-based control of a compressor which can be used in intelligent and optimised intelligent control systems usually proves to be cost effective only in the case of a new purchase, because the subsequent installation of a frequency converter in an existing compressor is not recommended by manufacturers.

壓縮機變速控制系統可用在智慧型及優化型智慧控制系統，只有在新購置時具成本效益，不建議製造廠家在一套使用中的壓縮機上裝設變頻器。

With optimised intelligent control, the pressure of the compressed air can thus be reduced from an average of 8.2 to 6.9 bar, which corresponds to energy savings of 9.1 %. Optimising the control involves only minor costs and can generate savings in the range of several hundred MWh/yr, that is, tens of thousands of euros (e.g. with an installed compressor performance of 500 k W, savings of about 400 MWh/yr can be achieved and about EUR 20000/yr can be achieved in the case of 8700 operational hours/year).

使用優化的智慧型控制系統，壓縮空氣的壓力從平均8.2降到6.9大氣壓力，相對節能9.1%。優化控制系統所需成本很低卻能產生每年數百度電及數萬歐元的節省。如一座全年運轉8700小時500kW的壓縮機可節省400度電及20000歐元。

Energy Efficiency (2009) 3.7.9