nZEB Lisbon Pilot Plant. Conversion of a Public Building into a nZEB Building.

In Lisbon, the pilot plant will be implemented under the leadership of the National Laboratory of Energy and Geology (LNEG), with the support of the Instituto Superior Técnico de Lisboa, which will integrate renewable heat/cold generation systems in a microgrid for the conversion of an existing public building into a zero energy balance building. For this purpose, LNEG will make available the Laboratory for renewable energy integration installations at its Lisbon Campus.

The pilot plant is powered by a 4 kWp photovoltaic system and 2.5 kW wind turbine and 30 kWh battery storage system, all integrated on a solar trigeneration system that provides electricity to power a micro grid. The thermal comfort energy is provided by a Solar Hot Water (SHW) installation of 4m2 Vacuum Tubes solar colletors and a 300 l water storage tank coupled with a 16kW power air/water heat pump associated to 1000 l water inertial tank to heat and cool individually the pilot plant meeting rooms through 4 fan coils. A Solar Domestic Hot Water (DHW) system with 4,2m2 PVT solar collectors and a 300 l solar tank with a supplementary electric heater provides hot water preparation to pilot plant area.

The aim of this pilot is to realise (and monitor) the conversion of a scientific public building into an nZEB. This pilot will be particularly interested in monitoring and modelling renewable generation power ramp rates and their impact:

  • On voltage and power quality inside buildings;
  • On the lifetime of batteries (and similarly with variable loads in fuel cells) to characterise their possible contribution as units of power system flexibility for very high renewable penetration scenarios;
  • Potential value for operating in reserve (secondary) electricity markets. A particular study will be carried out to characterise the value that buildings can have as "buffers for an energy system with very high renewable energy participation".
  • Improvement of the energy performance of the building when installing the envisaged air conditioning and heating systems.
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