Germany – Construction work – Sanierung historisches Rathaus - Wärme-/Kälteerzeugung

The scope of services includes the trade of heat/cold generation. The Rathaus Stolberg is to be heated and cooled using the two-pipe principle. For this purpose, the use of a brine-water heat pump is planned. The energy source is a combination of an ice storage system and an air absorber; optionally, nozzles are provided here, where an ice rink can be integrated later. The air absorber also handles the recirculation cooling in cooling mode during the summer. The cooling energy is preferably generated at night, at low outside temperatures. Due to the size of the ice storage system, daily cold production is not required and can be shifted to times when the outside temperature is moderate for recirculation cooling. The switch between heating and cooling mode is made via the provided switching valves depending on the season. In heating mode, energy is extracted from the liquid water in the ice storage system until it freezes. In cooling mode, cold water is taken directly from the ice storage system and provided for building cooling via a heat exchanger. The heat/cold generation system will be connected to an existing heating network on site. The system essentially consists of the following components: - Ice storage system - Air absorber - Heat pump - Hydraulic module - Control module - Hydraulic connection system. A buffer storage system must be installed for the system in the basement. The ice storage system will also be set up in the same basement room. Due to the installation possibilities, the storage system will be transported to the basement in segments and assembled on site. The heat pump and a hydraulic unit will be housed in the technical room on the ground floor. The heat pump is to supply the existing heating network on site. The hydraulic unit is the interface between the heat pump and the energy sources and enables the use and regeneration of the ice storage system. The control of the hydraulic unit performs the function of intelligent energy source management of both sources. In addition, it enables the regeneration of the energy storage system or the source medium located therein (water in the energy storage system). The air absorber will be mounted on a foundation on site northwest of the building in the outdoor area. The air absorber transfers the ambient heat and is used for the regeneration of the ice storage system. The basement room for setting up the ice storage system and the buffer storage system is approximately 7.9 m x 18.6 m in size, with a ceiling height of approximately 2.39 m. Access to the basement room is via a staircase (3.6 m x 5.4 m) with a landing staircase (width >1.4 m). The door openings in the basement are 1.00 m x 2.00 m. The staircase on the ground floor (6.6 m x 9.9 m) is larger and extends to the western entrance door (opening dimension 1.16 m x 2.00 m). The technical room has dimensions of approximately 3.5 m x 4.8 m and a ceiling height of approximately 3.1 m. The door opening of the technical room has the dimensions 0.94 m x 2.00 m. An area of approximately 2.6 m x 2.2 m is available for setting up the hydraulic unit and the heat pump. The technical room directly adjoins the western staircase.