Authors: Wenfeng Li Zhaojie Cui Feng Han
Publish Date: 2014/07/26
Volume: 22, Issue: 1, Pages: 275-285
Abstract
The available energy resources are being depleted worldwide Industrial symbiosis IS provides a promising approach for increasing the efficiency of energy utilization with numerous studies reporting the superiority of this technology However studies quantifying the energysaving efficiency of IS remain insufficient This paper proposes an index system for the quantitative evaluation of the energysaving efficiency of IS Both energysaving and financial indexes were selected the former include the IS energysaving index the contribution rate of energy saved through IS fractional energy savings and cut rate of energy consumption per total output value and the latter include the IS investment payback period IS input–output ratio net present value NPV and internal rate of return IRR of IS The proposed methods were applied to a case study on the XF Industrial Park XF IP in the city of Liaocheng in Shandong Province of China Three energysaving channels using IS were found in the XF IP a utilizing the energy of hightemperature materials among industrial processes b recovering waste heat and steam between different processes and c saving energy by sharing infrastructures The results showed that the energy efficiency index of IS was 0326 accounting for 346 of the comprehensive energysaving index in 2011 and the fractional energysavings were 1242 The index of energy consumption per total industrial output value varied from 909 tce/MRMB to 516 tce/MRMB Thus the cut rate of energy consumption per total industrial output value was 4342 The average values of the IS input–output ratio was 4062 RMB/tce 572 lower than the price of standard coal Static investment payback period in the XF IP was 85 months indicating that the XF IP began to earn profit 85 months after the construction of all IS modes The NVP and IRR of each IS mode in the XF IP were greater than zero with average values equal to 178996 MRMB and 14096 respectively The computation result for each indicator revealed that IS could lead to the use of energy with high efficiency and lighten the financial burden of enterprises in the XF IP And the proposed index system may help IPs and EIPs to make strategic decisions when designing IS modesThis paper could not have been completed without the comprehensive cooperation and support from the XF IP and the local EPA We also appreciate the academic and theoretical support from Dr Li Zhu Dr Fei Yu and Dr Xiaohua Ren as regards the methods and indexes of research and the English revision by Dr Pamela Holt
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