Variable Naming in CEA¶
This is a guide on how to name variables in CEA. Please do read / print before adding new varaibles to the code.
Demand Side Load Nomenclature¶
The variables that fall under this classification follow the syntax provided below:
(LOAD TYPE)(LOAD)_(LOSSES)_(UNITS)
The different values these parameters can take are enlisted below. The list is not exhaustive but will serve as a guide
Load Type:
| Q | Thermal |
| E | Electrical |
Load
| al | appliances |
| cdata | data cooling |
| cs | space cooling |
| cre | refrigeration |
| hs | space heating |
| l | lighting |
| pro | industrial processes |
| T | total |
| ww | hot water |
Losses
| sys | including losses (emission, distribution and storage inside the building) |
| ‘’ | if not used, then it is an end-use demand without losses |
Units
| W | Watt |
| kWh | kilo Watt hour |
| MWhyr | Mega Watt hour per year |
For Example:
El_sys_W : End-use demand of electricity required for lighting including system losses (in Watts)
El_W : End-use demand of electricity required for lighting without system losses (in Watts)
ET_sys_MWhyr : Total end-use demand of electricity required including system losses (in MWh per year)
Supply Side Load Nomenclature¶
The variables that fall under this classification follow the syntax provided below:
(LOAD TYPE)(LOAD)_(GENERATION UNIT)_(LOAD DIRECTION)_(UNITS)
The different values these parameters can take are enlisted below. The list is not exhaustive but will serve as a guide
Load Type:
| Q | Thermal |
| E | Electrical |
Load
| al | appliances |
| cdata | data cooling |
| cs | space cooling |
| cre | refrigeration |
| hs | space heating |
| l | lighting |
| pro | industrial processes |
| T | total |
| ww | hot water |
Generation Unit
| PV | Photovoltaic |
| PVT | Photovoltaic Thermal |
| SC | Solar Collector |
| CCGT | Combined Cycle Gas Turbine |
| FC | Fuel Cell |
| GSHP | Ground Source Heat Pump |
| BASEBOILER | Base Boiler |
| PEAKBOILER | Peak Boiler |
| BACKUPBOILER | Backup Boiler |
| VCC | Vapor Compression Chiller |
Load Direction
| GRID | to the local grid |
| DIRECT | to the direct load |
Units
| W | Watt |
| kWh | kilo Watt hour |
| MWhyr | Mega Watt hour per year |
For Example:
Qww_PVT_DIRECT_MWhyr : Heat generated by PVT supplied to the directload of hot water demand (MWhyr)
ET_PV_GRID_MWhyr : Total electricity generated by PV which is supplied to the local power grid (MWhyr)
Supply Side Cost Nomenclature¶
The variables that fall under this classification follow the syntax provided below:
(COSTS TYPE 1)_(COSTS TYPE 2)_(COSTS TYPE 3)_(GENERATION UNIT)_(UNITS)
The different values these parameters can take are enlisted below. The list is not exhaustive but will serve as a guide
Costs Type 1
| Capex | Capital Expenditure |
| Opex | Operational Expenditure |
Costs Type 2
| T | Total |
| A | Annualized |
Costs Type 3
| Var | Variable |
| Fix | Fixed |
Generation Unit
| PV | Photovoltaic |
| PVT | Photovoltaic Thermal |
| SC | Solar Collector |
| CCGT | Combined Cycle Gas Turbine |
| FC | Fuel Cell |
| GSHP | Ground Source Heat Pump |
| BASEBOILER | Base Boiler |
| PEAKBOILER | Peak Boiler |
| BACKUPBOILER | Backup Boiler |
| VCC | Vapor Compression Chiller |
Units
| USD | US Dollar (2015) |
| MUSD | Million US Dollar (2015) |
For Example:
Capex_A_Fix_CCGT_MUSD : Annualized CAPEX (fixed component) for CCGT equipment (in million USD)
Opex_T_Var_FC_USD : Total OPEX (variable component) of FC equipment (in USD)
Supply Side Fuel Nomenclature¶
The variables that fall under this classification follow the syntax provided below:
(FUEL TYPE)_(FUEL DIRECTION)_(GENERATION UNIT)_(UNITS)
The different values these parameters can take are enlisted below. The list is not exhaustive but will serve as a guide
Fuel Type
| NG | Natural Gas |
| Wood | Wood |
Fuel Direction
| used | Fuel is used by the generation unit |
| gen | resource is generated by the generation unit |
Generation Unit
| PV | Photovoltaic |
| PVT | Photovoltaic Thermal |
| SC | Solar Collector |
| CCGT | Combined Cycle Gas Turbine |
| FC | Fuel Cell |
| GSHP | Ground Source Heat Pump |
| BASEBOILER | Base Boiler |
| PEAKBOILER | Peak Boiler |
| BACKUPBOILER | Backup Boiler |
| VCC | Vapor Compression Chiller |
Units
| W | Watt |
| kWh | kilo Watt hour |
| MWhyr | Mega Watt hour per year |
For Example:
NG_used_HPSew_W : Natural gas used by sewage heat pump (in Watts)
Wood_used_Furnace_W : Wood used by Furnace (in Watts)
Supply Side Emissions Nomenclature¶
(LCA TYPE)_(GENERATION UNIT)_(UNITS)
LCA Type
| GHG | Green house gas emissions |
| PEN | Primary Energy |
Generation Unit
| PV | Photovoltaic |
| PVT | Photovoltaic Thermal |
| SC | Solar Collector |
| CCGT | Combined Cycle Gas Turbine |
| FC | Fuel Cell |
| GSHP | Ground Source Heat Pump |
| BASEBOILER | Base Boiler |
| PEAKBOILER | Peak Boiler |
| BACKUPBOILER | Backup Boiler |
| VCC | Vapor Compression Chiller |
Units
| tonCO2 | tons of CO2 equivalent |
| MJoil | Mega Joules of oil equivalent |
| GJoil | Giga Joules of oil equivalent |
For Example:
GHG_PVT_tonCO2 : Green house gas emissions of PVT (in tons of CO2 equivalent)
PEN_PV_MJoil : Primary Energy corresponding to PV (in Mega Joules of Oil equivalent)