The core element of this project is a functional, nanostructured layer that absorbs visual light and converts it into heat. Integration of the absorbent layer into a tubular polymeric foil laminate permits the transfer of heat to circulating water. The heat produced can either be used directly as low-temperature district heating (60–80°C), stored in a heat reservoir for later use, used as feed water for heat pumps, or used directly as process water.

Solution idea

Development of nano-surface coating (plasmonic structures) of solar collector pass-through plastic bags for more efficient and affordable solar heating of water for district heating at 60–80°C. Plasmonic structures (nanostructures) moulded into the surface optimise the incidence of light in plastic bag hoses, optimising the heating of water for district heating applications.

Project deliverables

Production of low-temperature district heating (60-80°C) and heat storage in soil reservoir.

Problem owner

Problem solvers

This project is financed by Energy Cluster Denmark’s Technology, Innovation, Environment, and Energy (TIME, from the Danish initials) support programme. It offers three years of support to allow small- and medium-sized businesses to collaboratively develop innovative electronic products focused on energy optimisation. The TIME project is supported by the European Regional Development Fund.

Project timeline

PHASE 1: Conceptualisation
PHASE 2: Development and testing
PHASE 3: Demonstration and validation
PHASE 4: Commercialisation

Financed by


Start: September 2020
End: December 2021
Grant: DKK 3.125.780

Contact person

Peter Munch Kofoed

Peter Munch Kofoed
Project Manager
Tlf: +45 3153 2597