Energy

5 of the bundled models. The numbers are from a run made when this page was generated: see how.

Biogas digester, holder and CHP

Digester, gas holder and CHP. A purely CONTINUOUS model: two feedstocks are fed on a daily recipe into a digester that releases biogas over the following days (a yield curve per substrate), the gas is stored in a holder whose methane share is tracked as a component, a CHP burns it under a minimum load and a maintenance failure, and the holder flares what it cannot keep. Base unit hours, 30 days.

naga run biogas_digester_demo

1 replication, seed 0:

KPI	Mean	95% half-width
level/Maize silo/Average	557
level/Slurry tank/Average	593
level/Gas holder/Average	476

Biogas plant (library assets)

A farm-scale biogas plant built ONLY from library assets: two feedstock deliveries (an autumn maize campaign and slurry tankers all year) into two feed lines, a 4000 m3 digester and a 2000 m3 post-digester, a 1500 Nm3 gas holder with a flare, a 500 kW CHP unit and a 120 Nm3/h membrane upgrading plant sharing the gas in merit order, grid injection, the heat balance, a 12 000 m3 digestate store on seasonal spreading windows, and the Energy library's site load and grid connection on the same electricity bus. Nothing is wired except the two truck links: everything continuous meets on the site bus. Base unit hours, one simulated YEAR of REAL DATES from the maize harvest on Monday 7 September 2026 (Europe/Rome): the campaign is a weekday delivery pattern that a dated exception closes when the harvest ends, the spreading windows are dated weeks, and the power price repeats "weekly" in calendar terms.

naga run biogas_plant_library

flowchart LR
    b0["feedstock_delivery_1 (SUBMODEL)"]
    b1["feedstock_delivery_2 (SUBMODEL)"]
    b2["feed_line_1 (SUBMODEL)"]
    b3["feed_line_2 (SUBMODEL)"]
    b4["digester_1 (SUBMODEL)"]
    b5["digester_2 (SUBMODEL)"]
    b6["gas_holder_with_flare_1 (SUBMODEL)"]
    b7["chp_unit_1 (SUBMODEL)"]
    b8["upgrading_unit_1 (SUBMODEL)"]
    b9["grid_injection_1 (SUBMODEL)"]
    b10["heat_balance_1 (SUBMODEL)"]
    b11["digestate_store_1 (SUBMODEL)"]
    b12["electrical_load_1 (SUBMODEL)"]
    b13["grid_connection_1 (SUBMODEL)"]
    b0 --> b2
    b1 --> b3

1 replication, seed 0:

KPI	Mean	95% half-width
system/Total Entities Completed	1,290
system/Avg Throughput Time	0.58
system/Avg Queue Length	0
system/Avg Resource Usage %	0
user/feedstock_delivery_1/Bio tonnes delivered	10,400
user/feedstock_delivery_2/Bio tonnes delivered	21,900
user/feed_line_1/Bio tonnes stored	10,400
level/feed_line_1/Bio Feed store/Average	5,300
level/feed_line_2/Bio Feed store/Average	516
level/digester_1/Bio Digester content/Average	3,960

Depot: PV, EV charging and heat pump

A depot on one electricity bus: a PV roof, the building's own load, twenty EV charge points and a heat-pump water tank, with a grid connection closing the balance. Nothing is wired -- the five assets meet on the named flow tags FLOWSUM() adds up, and the tank adds a SECOND medium (heat) fed from the same bus through its COP. Base unit hours, one week.

naga run energy_heat_and_ev

1 replication, seed 0:

KPI	Mean	95% half-width
level/evs/Nrg EV demand/Average	0
level/tank/Nrg Heat tank/Average	350
system/Total Cost	1,520

PV + battery sizing and dispatch

PV + battery sizing and dispatch. A purely CONTINUOUS model: no entities, no queues -- a daily PV profile, a household load profile and a time-of-use tariff drive a battery with power limits and round-trip efficiency, under a simple rule dispatch (charge on surplus, discharge on deficit). Base unit hours, one week.

naga run energy_pv_battery

1 replication, seed 0:

KPI	Mean	95% half-width
level/Battery/Average	4.35
system/Total Cost	6.02

PV + battery site (library assets)

A PV + battery site built entirely from the Energy and grid library: a PV array, a household load, a battery on the self-consumption rule and a grid connection with a time-of-use tariff and a carbon-intensity profile. Nothing is wired: the four assets meet on the site BUS, the named flow tags that FLOWSUM() adds up. Base unit hours, the real week of Monday 15 June 2026 in Europe/Rome: the daily PV, load, tariff and carbon profiles repeat "daily" in calendar terms and every result axis is a date.

naga run energy_site_library

1 replication, seed 0:

KPI	Mean	95% half-width
level/battery_storage_1/Nrg Battery/Average	4.19
system/Total Cost	19.2