Research project “rain2energy” wants to use rain­wa­ter to sup­ply a neigh­bor­hood with heat­ing and cooling

The recent­ly launched research project is con­cerned with the sus­tain­able sup­ply of the “ecoSquare” urban quar­ter in Bam­berg. The inno­v­a­tive ener­gy con­cept pro­vides for a regen­er­a­tive ther­mal sup­ply via a com­plex cold local heat­ing net­work with heat pumps. As part of the project, Enisyst is to devel­op a syn­er­get­i­cal­ly opti­mized over­all con­cept from this.

Two rain­wa­ter cis­terns with a total capac­i­ty of approx. 130 m³ are to heat and cool the ecoSquare dis­trict, which is cur­rent­ly under con­struc­tion, via a cold local heat­ing ring. For this pur­pose, heat is extract­ed from or sup­plied to the cis­terns as needed.

To real­ize the poten­tial, AI-based pre­dic­tive con­trol tech­nol­o­gy is being devel­oped that uses weath­er fore­casts, heating/cooling load pro­files, and rain­wa­ter usage pro­file to enable smart stor­age management.

Anoth­er goal of the con­trol strat­e­gy is to achieve a stormwa­ter bal­ance with no runoff to the sew­er and to use stormwa­ter to irri­gate green spaces.

In the project, Enisyst is deal­ing with the con­trol engi­neer­ing chal­lenge of com­bin­ing the ener­gy uti­liza­tion goals and those of rain­wa­ter man­age­ment in a syn­er­get­i­cal­ly opti­mized over­all concept.

In addi­tion, the project will inves­ti­gate issues relat­ed to stormwa­ter treat­ment and altered bio­di­ver­si­ty, as well as ana­lyze build­ing per­mit process­es. After com­ple­tion of con­struc­tion, mon­i­tor­ing and oper­a­tional opti­miza­tion will follow.

Self-suf­fi­cient quar­ter thanks to renew­able energies

Con­serv­ing resources while still pro­vid­ing com­fort­able liv­ing is the focus of the plan­ning and imple­men­ta­tion of this neigh­bor­hood. The most impor­tant build­ing blocks for this are a holis­tic, sus­tain­able ener­gy con­cept, closed uti­liza­tion cycles and an inno­v­a­tive mobil­i­ty con­cept with car, bike shar­ing and electromobility.

Build­ings in the neigh­bor­hood are intend­ed to be self-suf­fi­cient and will be designed for both ener­gy con­ser­va­tion and ener­gy pro­duc­tion. Par­tic­u­lar­ly effi­cient ener­gy use through sec­tor cou­pling as well as the avoid­ance of CO2 release, air and water pol­lu­tion con­trol are a mat­ter of course here.

The ener­gy for heat­ing, cool­ing, e‑mobility and part of the elec­tric­i­ty in the planned build­ing com­plex is pro­duced direct­ly on site and comes from sus­tain­able sources. Pho­to­voltaics on the roofs and in the facades pro­duce elec­tric­i­ty. A com­bined heat and pow­er plant, pow­ered by green gas from NATURSTROM, and a geot­her­mal probe field gen­er­ate heat and cold. Both are stored in buffer stor­age tanks, in the geot­her­mal probe stor­age tank and in the con­crete mass of the build­ing com­po­nents and trans­port­ed to where it is need­ed via an aner­gy ring in the neighborhood.