Heat Pump
Optimize the operation of a heat pump using epl.HeatPump.
A heat pump uses electricity to convert low temperature heat to high temperature heat.
When using epl.HeatPump.optimize, the alternative to the heat pump is generating high temperature heat from a gas boiler. Under the hood of epl.HeatPump.optimize, a epl.Boiler asset is used to supply the balance of high temperature heat demand of the site.
The gas price is important as the alternative to using a heat pump to supply the high_temperature_load_mwh is using a natural gas boiler.
In order for the heat pump to work, it needs to have both a source of low temperature heat and a sink of high temperature heat.
The high_temperature_load_mwh is the amount of heat consumed by the site, and low_temperature_generation_mwh is the amount of available low temperature heat.
import energypylinear as epl
asset = epl.HeatPump(
electric_power_mw=1.0,
cop=2,
gas_prices=20,
electricity_prices=[100, -100],
high_temperature_load_mwh=3.0,
low_temperature_generation_mwh=3.0,
)
simulation = asset.optimize(verbose=False)
print(
simulation.results[
[
"site-electricity_prices",
"heat-pump-electric_load_mwh",
"heat-pump-low_temperature_load_mwh",
"heat-pump-high_temperature_generation_mwh",
]
]
)
assert all(
simulation.results.columns
== [
"site-import_power_mwh",
"site-export_power_mwh",
"site-electricity_prices",
"site-electricity_carbon_intensities",
"site-high_temperature_load_mwh",
"site-low_temperature_load_mwh",
"site-low_temperature_generation_mwh",
"site-gas_prices",
"site-electric_load_mwh",
"spill-electric_generation_mwh",
"spill-electric_load_mwh",
"spill-high_temperature_generation_mwh",
"spill-low_temperature_generation_mwh",
"spill-high_temperature_load_mwh",
"spill-low_temperature_load_mwh",
"spill-gas_consumption_mwh",
"boiler-high_temperature_generation_mwh",
"boiler-gas_consumption_mwh",
"valve-high_temperature_load_mwh",
"valve-low_temperature_generation_mwh",
"heat-pump-electric_load_mwh",
"heat-pump-low_temperature_load_mwh",
"heat-pump-high_temperature_generation_mwh",
"total-electric_generation_mwh",
"total-electric_load_mwh",
"total-high_temperature_generation_mwh",
"total-low_temperature_generation_mwh",
"total-high_temperature_load_mwh",
"total-low_temperature_load_mwh",
"total-gas_consumption_mwh",
"total-electric_charge_mwh",
"total-electric_discharge_mwh",
"total-spills_mwh",
"total-electric_loss_mwh",
"site-electricity_balance_mwh",
]
)
{
'n_spills': 1,
'spill_columns': 8,
'spills': {'spill-low_temperature_load_mwh': 5.0},
'event': 'warn_spills',
'timestamp': '2023-09-08T00:41:33.743617Z',
'logger':'default_logger',
'level': 'warning'
}
site-electricity_prices heat-pump-electric_load_mwh heat-pump-low_temperature_load_mwh heat-pump-high_temperature_generation_mwh
0 100 0.0 0.0 0.0
1 -100 1.0 1.0 2.0
Under the hood the heat pump asset also includes a epl.Spill, which allows dumping of excess low temperature heat, and a epl.Valve to allow high temperature heat to flow into low temperature heat.
The combination of a epl.Spill, epl.Valve and negative electricity prices can lead to the heat pump using electricity to generate high temperature heat which is then dumped as low temperature heat. For this reason the epl.HeatPump asset includes a include_valve: bool option to turn off the valve.
You could also setup an epl.Site with other assets that generate high temperature heat to explore different tradeoffs (such as a heat pump using low temperature heat from a CHP system).