The Rostock City Utilities AG is announcing the planning for the construction of a long-term heat storage system (LZS) as a pit thermal energy storage facility (Pit-Thermal-Energy-Storage, PTES). The facility is classified as an engineering structure by the Rostock City Utilities and includes the pit thermal energy storage with a cover as well as the pump house with reheating. The planning services should cover performance phases 1 to 8, which are to be triggered subject to feasibility or economic viability.
In parallel to the planning works, comprehensive investigations of the building ground are currently being conducted, and the results are expected in the 3rd quarter of 2026. Based on this, it will be examined and decided whether the “long-term heat storage” project or the planning will continue.
Short description of the facility:
The facility serves to shift unused heat or heat potentials, primarily available in summer, into the heating period for peak coverage of heat demand. The long-term heat storage will be indirectly charged with heat through the district heating network, separated by heat exchangers. For this, a pump house with the corresponding heat exchangers is to be constructed. Since the heat storage serves both as a large consumer (charging) and a heat generator (discharging), the pipelines and fittings must allow for flow reversal. The integration of a reheater is also required to raise the stored water to the district heating supply temperature. Further use cases for the reheater include the direct charging of the storage or the direct feeding into the district heating network. To achieve the necessary thermal stratification in the storage and to maintain it during both charging and discharging, nozzles installed in the storage are required, fulfilling this requirement through their special geometry.
LOT-0001
LOT-0001 BE 260495
Planning for a long-term heat storage as a pit thermal energy storage facility.
The Rostock City Utilities AG is announcing the planning for the construction of a long-term heat storage (LZS) as a pit thermal energy storage facility (Pit-Thermal-Energy-Storage, PTES). The facility is classified as an engineering structure by the Rostock City Utilities and includes the pit thermal energy storage with a cover as well as the pump house with reheating. The planning services should cover performance phases 1 to 8, which are to be triggered subject to feasibility or economic viability.
In parallel to the planning works, comprehensive investigations of the building ground are currently being conducted, and the results are expected in the 3rd quarter of 2026. Based on this, it will be examined and decided whether the “long-term heat storage” project or the planning will continue.
Short description of the facility:
The facility serves to shift unused heat or heat potentials, primarily available in summer, into the heating period for peak coverage of heat demand. The long-term heat storage will be indirectly charged with heat through the district heating network, separated by heat exchangers. For this, a pump house with the corresponding heat exchangers is to be constructed. Since the heat storage serves both as a large consumer (charging) and a heat generator (discharging), the pipelines and fittings must allow for flow reversal. The integration of a reheater is also required to raise the stored water to the district heating supply temperature. Further use cases for the reheater include the direct charging of the storage or the direct feeding into the district heating network. To achieve the necessary thermal stratification in the storage and to maintain it during both charging and discharging, nozzles installed in the storage are required, fulfilling this requirement through their special geometry.