Policy Analysis System Model (POLYSYS)
Abstract:
POLYSYS is a linear program partial equilibrium model that simulates the US agriculture sector. With national inputs on projected demands for food, feed, fiber, and exports, and county-level inputs on starting cropland acres, pastureland acres, potential crop yields, and crop production budgets, the model solves for the most profitable allocation of land from the landowners' perspective. POLYSYS has been used to assess agriculture sector responses to changing market conditions, and is used in collaboration with the Agricultural Policy Center of the University of Tennessee.
Model/Tool Platform:
FORTRAN
General Modeling Type:
Hybrid / other: Partial Equilibrium model (hybrid optimization)
Primary analytical purpose:
Feedstock market assessment:
Assessment of potential feedstock resources using an approach that evaluates the market sector producing the feedstock (e.g., agriculture or forestry).
Secondary analytical purpose:
Feasibility/Implementation assessment:
Assessment of the feasibility or implementation of technologies and feedstocks in terms of operations or in the context of their landscape or market.
Metric categories:
- Environmental:
- Environmental Productivity (feedstock-related, e.g., NPP or yield)
- GHG Emissions
- Soil Quality
- Socio-economic:
- Process Productivity (conversion-related, e.g., yield)
- Techno-economic Impact
- Other Socio-economic (e.g., GDP impact, Investment/NPV)
Geospatial resolution:
County
Temporal resolution:
Years
Laboratory:
ORNL - Oak Ridge National Laboratory
Principal investigator:
Matt Langholtz
Model start year:
2003
Model last updated:
2017
Development status:
Fully Developed with periodic updates
Level of validation/review:
External Peer Review
Links:
Model scope:
Biomass Supply
Feedstock Logistics
Conversion
Distribution
End Use
- Feedstock Types
- Starch
- Sugar Crops
- Oil Crops
- Fiber Crops
- Cover Crops and Hay
- Agricultural Residues
- Herbaceous Energy Crops
- Forest Residues
- Forest Resources
- Woody Energy Crops
- Conversion Technology
- Starch to Sugars
- Lignocellulosic Biomass to Sugars
- Lignocellulosic Biomass to Gaseous Intermediate
- Sugar Catalytic Upgrading
- Sugar Biological Upgrading
- Products/Process Outputs
- Transportation Fuels - Biodiesel
- Transportation Fuels - Ethanol
- Biopower
- Intermediate - Clean Biomass-based Crop Oils
- Bioproducts
- Other Process Output
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Analytical Purpose
Supply Chain Elements
Biomass Supply
Feedstock Logistics
Conversion
Distribution
End Use
Information last updated: Sep. 17, 2019 13:45:46 EDT