What is SiENA?
SiENA simulates power consumption and generation in a domestic area. Also the heat consumption of households is integrated. This is a trimmed online version of SiENA. For further information or access to the full version take a look at the FAQ or contact us.

Why are the simulations limited in duration, interval and number of homes?
The simulations of SiENA need processing power. To prevent long waiting times, the simulations are limited in the online version.

Which devices are represented by the baseload?
The baseload represents all devices which cannot be controlled. This includes stove, lighting, entertainment and office devices amongst others.

What are adaptable devices?
Adaptable devices are able to adapt their energy consumption or generation dynamically. This includes battery storages and electric vehicles.

What are switchable devices?
Switchable devices can be switched on or off depending on the current situation. This include heating rods, heat pumps and CHPs.

What are shiftable devices?
Shiftable devices include washing machines, dishwashers and tumble driers. The activation times of these devices can be shifted in time.

How are PV-systems sized?
PV-systems are sized up to 15 kW peak. A propability distribution was generated using the sizes of approx. 30,000 PV-systems.

Which electric vehicles are simulated?
Battery capacity and fuel economy of common electric vehicles of 2014 are used (Renault Zoe, Smart Fortwo ED, Mitsubishi i-MiEV / Citröen C-Zero / Peugeot iOn, VW E-up!, BMW i3, VW e-Golf, Nissan Leaf, Ford Focus Electric, Tesla Model S60, Tesla Model S85).

How are electric vehicles modelled?
Electric vehicles are battery storages which are not present at any time. Probability distributions are defined for work or leisure activities which determine trip start, duration and distance. The charge level is adjusted according to trip distance and fuel economy.

Which size are the battery storages?
Common battery storages are used. They are sized between 2,400 Wh and 16,000 Wh.

Which kind of heat pumps are considered?
Common heat pumps are used (air/water, brine/water, water/water). The electrical consumption of the heat pumps is between 363 W and 17,000 W.

Which kind of CHPs are considered?
Common Combined Heat and Power systems (CHPs) are used. They are sized from 300 W electrical power up to 2,000,000 W.

How are CHPs assigned to households?
Each household has a random living space size and heat efficiency. This results in a certain heat demand. A CHP has to run at least 5,000 hours per year in average. So the size of the CHP is limited. Example: room size = 120 m², heat efficiency = 100 kWh/(y*m²) -> demand per year = 12,000 kWh/y, So the CHPs has to be sized between 1,520 W and 2,400 W thermical generation.

How are heat pumps assigned to households?
Each household has a random living space size and heat efficiency. This results in a certain heat demand. A heat pump has to run at least 2,000 hours per year in average. So the size of the heat pump is limited. Example: room size = 120 m², heat efficiency = 100 kWh/(y*m²) -> demand per year = 12,000 kWh/y, So the CHPs has to be sized between 1,520 W and 6,000 W thermical generation.

How can switchable and adaptable devices generate and consume at same time?
No device can generate and consume energy at the same time. The consumption of a device and the generation of another device are listed separately.

How is the consumption and output per year calculated?
The consumption and output per year is linear approximated.

Which size are the hot water tanks?
Stay tuned.

I started a simulation with an interval of X. Why are the plots only displayed in an hourly interval?
SiENA produceds lots of data points which cannot be handled by interactive plots in the browser. If you want to take a closer look at the data, please use the download button at the result page. The original data is available there.

How does SiENA work?
SiENA is based on ns-3. A paper describing the architecture and simulation models is currently under review.

How does the demand side management work?
A paper describing the architecture and simulation models is currently under review.