Eco-efficiency considers both environmental impacts and economic values. It is a useful tool for communicating with stakeholders for business decision making. This study evaluated the eco-efficiency factor (EEF) for the energy network of a dyeing company that supplies surplus heat to a neighboring apartment during the night. This symbiosis network is one of the eco-industrial park (EIP) projects in Korea and aims to benefit local residents and the industrial complex by utilizing surplus heat. In this study, two categories were annualized. The first quantified environmental burden based on CO2 emissions and quantified product value in terms of steam sales. The second used a variety of environmental factors, such as fossil fuel, water and waste, to quantify environmental burden and used steam sales to quantify value. The EEF of the symbiosis network was 1.6, using the global warming impact, and determined using the multiple variable, was 1.33. This study shows that the EEF depends on variable details of environmental burden but the values of this project were very high contrast to other business or EIP project.

Abstract
 1. Introduction
 2. Methodology
  2.1. Eco-efficiency factor
  2.2. Industrial sy
  2.3. The heat balance between households and the CHP plant
  2.4. Additional energy supply for the complete network
 3. Results and Discussion
  3.1. The global warming eco-efficiency factor
  3.2. The eco-efficiency factor using multiple variables
  3.3. The eco-efficiency factor industrial symbiosis network
 4. Conclusion
 References

• Choon-Hwan Shin(Department of Energy & Environment, Dongseo University)
• Ji-Won Kim(Institute for Environmental Technology and Industry, Pusan National University) Corresponding author