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Heating and hot water equipment

The biomass boiler is located in the thermal heating equipment room in the bioclimatic demonstration house located in the Sotavento Experimental Wind Farm. The equipment uses pellets as a biofuel, which are loaded by pneumatic conveyor from a silo with a capacity of 2,500 kg located in the house’s store room. The thermal power rating of the equipment is 20 kW.

Biomass Boiler (1)

The supply of from the boiler to the heating and hot water system is carried out by means of a layered 800 litre buffer tank. On this tank, besides the biomass boiler, is connected a geothermal heat pump capable of supplying energy in parallel, operating on the top and bottom of the accumulator respectively. From this tank, hot water is propelled and returned for under floor heating. It also includes an internal coil-type heat exchanger intended for the hot water production.

Monitored parameters


The stored and monitored parameters for this equipment are:

  • Temperature of fluid in the inlet and outlet of the boiler
  • Buffer tank temperatures at five levels
  • Current flow
  • Instantaneous power transmitted
  • Thermal energy transmitted

Technical features


Make and Model OKPFEN PELLEMATIC PE20
Nominal heat output 20 kW
Overall width 1,130 mm
Boiler width 700 mm
Boiler height 1.090 mm
Boiler depth 814 mm
Diameter of return connections 1"
Diameter of smoke chimney 150 mm
Weight 250 kg
Electrical connection 230 V 50 Hz
Efficiency 92.6%
Efficiency at part load 91.1%
Water content 66 L
Exhaust temperature 160 ºC

Demo application


Sotavento has a demo application, visual and interactive, allowing you to view the system data in real time and perform multiple calculations and extrapolations.

Biomass Boiler (2)

Access and download data


The parameters of the thermal installations at Sotavento Wind Farm are stored in a database and integrated into an application for downloading data. This application allows organizations, companies or universities that have Sotavento partnership agreements access to data needed for the development of projects.

To see the complete list of parameters stored in the premises of the wind farm and bioclimatic house go here.

The geothermal heat pump, as with the biomass boiler, is located in the thermal heating equipment room in the bioclimatic demonstration house located within the Sotavento Experimental Wind Farm. The equipment has its own cooling circuit on the evaporator side, connected to a horizontal geothermal heat exchanger. Basically, this exchanger consists of 500 m of DN 32 mm polyethylene tubing located under backfill material coming from the excavation of the house itself to an average depth of 2 m, which allows the extraction of heat energy from the ground to be used to cover housing demands. The heat pump has a nominal heat output of 8.2 kW and a COP of 4.7 (COP for an average temperature in the evaporator 0 ºC and 35ºC in the condenser, excluding the power consumption of the circulation pumps). The heat pump works on demand on the lower part of a layered 800 litre buffer tank.

Geothermal Heat Pump (1)

Monitored parameters


The parameters stored and monitored for this equipment are:

  • Temperature of the fluid at the inlet and outlet of the geothermal circuit heat pump
  • Temperature of the fluid at the inlet and outlet of the secondary circuit heat pump
  • Buffer tank temperature sat five levels
  • Flow currentin the secondary circuit
  • Instantaneous power transmitted
  • Thermal energy transmitted
  • Ground temperature in the geothermal exchanger in 32 points
  • Reference temperature of undisturbed ground

Technical Features


Make and Model OPTIHEAT 8es
Nominal heat output1 8.2 kW
COP1 4.7
Electrical power consumption 1.7 kW
Water flow in the evaporator (ΔT=3ºC) 2.00 m3/h
Water flow in the condenser (ΔT=10ºC) 0.71 m3/h
Pump width 1,260 mm
Pump height 700 mm
Pump depth 530 mm
Refrigerant type/charge 410A/2.1 kg
Max. electrical power consumption 5.4 kW
Max. electrical power consumption including pumps 5.9 kW
Electrical connection 400-3 V 50 Hz

1 Excluding the electrical consumption of the circulation pumps, and for the average evaporator temperature of 0 °C and 35 °C in the condenser.

Demo application


Sotavento has a demo application, visual and interactive, allowing you to view the system data in real time and perform multiple calculations and extrapolations.

Geothermal Heat Pump (2)

Access and download data


The parameters of the thermal installations at Sotavento Wind Farm are stored in a database and integrated into an application for downloading data. This application allows organizations, companies or universities that have Sotavento partnership agreements access to data needed for the development of projects.

To see the complete list of parameters stored in the premises of the wind farm and bioclimatic house go here.