Hybrid Compressor Modelfor Optimal Operation of CompressedDry Air System in LCD Production Industry.

Compressed dry air (CDA) is a widely used utility inliquid crystaldisplay (LCD) production industry usually utilized as an air knifeand an air curtain for room and glass cleaning to prohibit particlesfrom entering the chamber. CDA is consumed in various sites of theproduction line and demand for CDA fluctuates largely from momentto moment. Therefore, it is common to supply compressed air with anumber of small-capacity compressors rather than few large-capacityones. To find an optimal operating strategy of such a compressor network,a first hybrid modeling technique of an ideal model and an empiricalmodel is used to predict the efficiency and power consumption of eachcompressor. Ideal compression work is calculated using thermodynamicequation with slight modification. An artificial neural network isconfigured to predict the efficiency. Then, actual power consumptionof each compressor is given by the ratio of ideal work to efficiency.Then, optimization procedure is applied to search optimal operatingconfiguration. The proposed method is applied to LCD production industryto show good prediction accuracy. Energy saving of total compressionwork is achieved by optimization scenario of segregating full-loadand part-load compressor group. [ABSTRACT FROM AUTHOR]