NetLogo User Community Models

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##WHAT IS IT?
The purpose of the model is to represent the interactions between companies of an Eco-Industrial Park (EIP) in terms of the flow of by-products.

The global environment, that is, the NetLogo world, is divided into two local units. One represents the EIP and contains the agents “companies”, which may interact with each other through the exchange of by-products. The other unit represents the environment external to the EIP and contains the agent “landfill”, which is responsible for receiving the non reused by-products.

The model was designed to allow the calculation of indicators of industrial symbiosis for every change in the system’s state from the data of reused and discarded by-products.

This first version of the model includes the calculation of three indicators:

* The “Industrial Symbiosis Indicator” (ISI), by Felicio _et al_. (2016)
* And the two indicators by Tiejun (2010), “Eco-Connectance” and “By-product and Waste Recycling Rate”, that must be used together

The model is named EIPSymb, an allusion to EIP and Symbiosis terms.

##HOW IT WORKS
The indicators calculations use data generated trough the model actions. In summary, the model allows the following actions:

* Entrance and exit of EIP's companies;
* Creation of by-products exchange links between companies;
* Variation in the amounts of by-products traded between companies;
* Variation in the amounts of by-products generate by each company;
* Dispatch of by-products not used to the landfill.

The behaviors of these actions depend on the input data provide by the model user. These data will be detailed in the section “HOW TO USE IT”.

The by-products generated by the companies are differentiated into five types, which follow the following rule:

* Type of by-product generated by the company = A -> Type of by-product the company can use as raw-material = E
* Type of by-product generated by the company = B -> Type of by-product the company can use as raw-material = A
* Type of by-product generated by the company = C -> Type of by-product the company can use as raw-material = B
* Type of by-product generated by the company = D -> Type of by-product the company can use as raw-material = C
* Type of by-product generated by the company = E -> Type of by-product the company can use as raw-material = D

##HOW TO USE IT
There are, in the model interface, “Sliders”, “Inputs” and “Choosers”. The user must interact with them in order to calibrate the model accordingly to the scenario he wants to create. These input data are:

* Sliders:
* probability-of-entry-of-a-new-company: value between 0 and 100% used in the entry decision of a new company
* probability-of-exit-of-a-company: value between 0 and 100% used in the exit decision of a company
* probability-of-creating-connection: value between 0 and 100% used in the decision to create new symbiotic links between existing companies
* probability-of-increasing-connection-intensity: value between 0 and 100% used in the decision to increase the amount of by-products exchanged between companies through existing links
* probability-of-decreasing-connection-intensity: value between 0 and 100% used in the decision to decrease the amount of by-products exchanged between companies through existing links
* probability-of-increasing-production: value between 0 and 100% used in the decision to increase the production of each company with a direct impact on the amount of by-products generated and on the capacity of by-product absorption
* probability-of-decreasing-production: value between 0 and 100% used in the decision to decrease the production of each company with a direct impact on the amount of by-products generated and on the capacity of by-product absorption

* Inputs:
* intensity-variation-step: this value must be greater than 1 and is used in processes that vary the link intensity between companies. This value represents the step in which link intensity is altered
* increment-production: this value must be greater than 1 and is used in the process that changes the values of each company’s amount of by-products generated and capacity of by-product absorption. This value represents the step in which these variables are changed

* Choosers:
* Legislation-Res-X: by-product classification regarding the “Legislation” criterion suggested by Felicio _et al_. (2016) for the ISI calculation
* Class-Res-X: by-product classification regarding the “Class of by-product” criterion suggested by Felicio _et al_. (2016) for the ISI calculation
* Use-Res-X: By-product classification regarding the “Use of by-product” criterion suggested by Felicio _et al_. (2016) for the ISI calculation
* Problems/risks-Res-X: by-product classification regarding the “Problems/risks” criterion suggested by Felicio _et al_. (2016) for the ISI calculation

The criteria, and its evaluation, suggested by Felicio _et al_. (2016) are:

* Legislation: (1) Good Practices; (3) General Requirement; (5) Specific Legal Requirement
* Class of by-product: (1) Non-hazardous, inert; (3) Non-hazardous, non-inert; (5) Hazardous
* Use of by-product: (1) By-product is treated by both the donor and recipient company; (3) By-product is treated by the recipient company; (5) By-product treatment is not required by either of the companies
* Destination of by-product: (1) Another EIP, with pretreatment; (3) Another EIP, without pretreatment; (5) Industrial Landfill (Class I and II)
* Problems/risks: (1) Nonexistent; (3) Possible/isolated; (5) Frequent

There are also “Buttons” that can be triggered by the user:

* Setup: clears the NetLogo world, visually differentiates local units, and creates the agent “landfill”
* Go once: runs one period of the simulation
* Go: runs the simulation until the button is triggered again
* Recalc. ISI: recalculates the ISI without the need to run more periods of simulation. It is useful when only the criteria of the by-products classifications are changed

##THINGS TO NOTICE
The following information can be noted in each period:

* Current period
* NetLogo world
* Number of companies
* Existing symbiosis links
* Possible symbiosis links
* Value of the ISI
* Value of Eco-Connectance and By-product and Waste Recycling Rate
* Amount of by-products that is being changed by each link (tons)
* Each company’s type of byproduct generated
* Each company’s amount of byproduct generated (tons)
* Each company’s type of byproduct that can be absorbed as raw-material
* Each company’s capacity of byproduct absorption (tons)
* Each company’s amount of byproduct absorbed (tons)

Moreover, it can be observed the graphical evolution of each indicator throughout the simulation.

##THINGS TO TRY
The user should try to change the input data values in order to create different scenarios.
If the user has access to data on the evolution of a real EIP, he can calibrate the input data in order to create a scenario closer to reality.

##EXTENDING THE MODEL
This version of the model includes only the calculation of the ISI, by Felicio _et al_. (2016), and the indicator of Eco-Connectance and By-product and Waste Recycling Rate, by Tiejun (2010).

It is suggested the addition of other industrial symbiosis indicators to be calculated by the model.

##CREDITS
Gabriel Couto Mantese (gabriel_mantese@outlook.com)
University of São Paulo
Brazil

##REFERENCES
FELICIO, M.; AMARAL, D.; ESPOSTO, K.; DURANY, X. G. Industrial symbiosis indicators to manage eco-industrial parks as dynamic systems, Journal of Cleaner Production, 2016, doi: 10.1016/ j.jclepro.2016.01.031.

TIEJUN, D. Two quantitative indices for the planning and evaluation of eco-industrial parks. Resources, Conservation and Recycling, v. 54, n. 7, p. 442-448, 2010.