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)