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Interventions in the Belgian Demo Site

The building set for demonstration has a high heating demand quantified at 180 kWh/(m2y) over an overall conditioned area of 23,600 m2. Active and passive technologies will be implemented. 

The aim of deploying passive technologies is to reduce the large heating demand through:

Insulation of 1,045 m² of roofing in block No. 1 and 6.
Replacement of 1,153 m² of main curtain wall in block No. 1.
Installation of 22 prototypes of UHA (decentralized ventilation units) in classrooms, laboratories and offices.
Replacement of 1,293 m² frames by high thermal performance windows and suitable with a decentralized ventilation system + insulation of 2,486 m² of facades.

 

The aim of implementing active technologies is to use biomass fuel to produce much of the heat and electricity required.

Bricker system integration into the existing energy system for the Belgian demo building.
Please click the graphic to enlarge the image

The heating distribution system is based on high temperature radiators with a nominal setpoint temperature of 75oC. Cooling is not being addressed due to the climate and the lack of dedicated distribution systems and terminals.

The existing installed heating capacity (3 boilers with an overall power of 7.5 MW) is greater than the nominal capacity of the Bricker energy concept (0.3 MW in the ORC condenser, 1.5 MW in the new biomass boiler). The building’s dense urban location means that it is difficult to introduce a solar harvesting system.

The derived Bricker energy system involves an ORC unit supplied by a biomass boiler of 1.5 MW capacity. This boiler uses thermal oil as an energy carrier. A thermal storage facility filled with oil will be installed in order to offset the ORC’s capacitance effect. High temperature radiators can be supplied by exploiting the ORC’s condensing heat or alternatively by the biomass boiler directly, via an intermediated oil-water heat exchanger. In this case, it would be important to develop an adequate control strategy in order to avoid the formation of steam in the water loop.

View of the ISIL building numerical model made with Sketch Up.

The planned system simulations will be in-depth. They will focus on the volume of oil storage tank fed by the biomass boiler, alternative system integration (parallel, series) of the BRICKER energy system into the existing one. It will also assess the energy efficiency gains of having a hot-water storage tank separating the heating distribution system from the ORC condenser, existing boilers and the biomass boiler.