Aalborg CSP received an order from Dronninglund Fjernvarme to deliver a new lid solution for the district heating plant’s Pit Thermal Energy Storage (PTES) system. The new durable and operationally stable lid design enables dewatering and vapor diffusion contributing to higher efficiency and reliability.

FACTS:

Client:       Dronninglund Fjernvarme
Location:    Dronninglund, Denmark
Status:    Operational
Technology:     PTES lid
Area - PTES lid:     8,281 m2
Expected lifetime:     25 years

The district heating plant required a new PTES lid as water accumulation had damaged the original lid beyond repair. The new lid solution, which is certified by Lloyd's Register, enables dewatering and vapor diffusion ensuring lower heat loss in the PTES and contributing to higher efficiency and reliability. A diffusion-open construction allows for vapor to diffuse through the upper liner above the insulation. The lid is furthermore divided into nine sections for improved rainfall handling. The lid solution requires a minimum of maintenance and supervision. 

A large amount of old insulation was suitable for reuse and as such it was possible for Aalborg CSP to recycle these materials in the best way and provide the district heating plant with a cost-effective and sustainable solution.