ECONOMIC DESIGN OF REFRIGERATED AUTOMATED STORAGE AND RETRIEVAL SYSTEMS |
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| Authors: | H. HWANG I. H. CHANG S. W. MOON J. M LIM |
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| Affiliation: | 1. Department of Industrial Engineering , Korea Advanced Institute of Science and Technology , 373-1 Gusung-dong, Yusong-gu, Taejon, 305-701, Korea;2. CALS &3. CIM Solution Division , LG-EDS Systems Inc , Sahak Bldg. 9ThFloor, 27-2, Yoido-dong, Youngdungpo-gu, Seoul, 150-742, Korea;4. Department of Industrial Engineering , Taejon National University of Technology , 305 Samsung-dong, Dong-gu, Taejon, 300-717, Korea |
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| Abstract: | The objective of this paper is the development of a design model for refrigerated automated storage and retrieval systems (R-AS/RS). Compared with ordinary unit-load AS/RS, the R-AS/RS under this study has several different design and operating characteristics: (I) greater emphasis is placed on the storage function and so it has a double-depth lane in the storage rack; (2) cooling units are required to maintain a cold temperature environment in the system; (3) the maximum number of storage orders handled per unit time is limited by the system capacity. Considering the above characteristics, the design problem is formulated as a non-linear mixed integer programming problem in which the cost of the system is minimized. The decision variables are the storage volume, the number of storage and retrieval (S/R) machines, the type and number of cooling units, and the physical configuration of the building. A case problem is solved to illustrate the model. |
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| Keywords: | R-AS/RS cooling units non-linear mixed integer programming |
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