Perfect combination: CHP unit with four-pass boiler
Efficient system solution from Bosch for the Traunstein Hospital
The Traunstein Hospital is an academic teaching hospital of the Ludwig-Maximilians-Universität München and a hospital with regional specialised medical services in diagnosis and therapy. As the largest hospital in the "Kliniken Südostbayern AG" hospital association the Traunstein Hospital ensures medical care for the city of Traunstein and the entire southern Chiemgau region. The hospital has a total capacity of 518 beds at 22 wards and provides of two emergency wards. Several day clinics and competency centres ideally complement the treatment and diagnostic options. Attached to the Traunstein Hospital is the rescue helicopter station "Christoph 14".
As part of the renovation of its central energy generation and sterile supply department, Traunstein Hospital has decided on an efficient system solution from Bosch. The system consists of a combined heat and power unit (CHP) with four-pass boiler that are perfectly matched with each other. In future, the system will provide part of the required electrical power and heat, as well as the required process steam for the hospital operation. The energy system is completed by intelligent Bosch control technology. The integrated remote technology, for example, facilitates the forward-looking monitoring of the CHP unit. The retrieval of relevant system data is performed by means of a protected web portal with commercially available devices. The same process is used when banking online using PC, tablet or smartphone.
For energy-intensive operations such as hospitals the use of CHP units is especially profitable. The continuous, simultaneous power and heat demand ensures long operating times and thus substantially contributes to reduce electricity costs. The waste heat of the motor powered by natural gas is used for heating the building, DHW heating and for heating the helicopter platform of the hospital in the winter months. The snow- and ice-free helicopter landing pad ensures a rapid treatment for emergency patients.
In order to further increase the efficiency of the system the remaining flue gas heat of the CHP is used in the Traunstein Hospital for steam generation. For this purpose, the used UL-S steam boiler is equipped with a fourth pass where flue gases transfer heat to the water. Peak loads are covered by the natural gas-powered firing. Downstream of the boiler a heat exchanger ensures that maximum heat is recovered from flue gases. The hospital benefits from an extremely economic, continuous steam supply for optimal sterilisation and hygiene.
In order to ensure a maximum steam supply reliability an additional UL-S steam boiler with heat maintenance is integrated. With the help of a built-in heating coil in the boiler end the steam generator is kept warm at reduced pressure. This ensures significantly faster availability and increases the service life of the system due to a reduced number of cold starts. In addition, for boosting the heating an UT-L heating boiler is used. Modular boiler house components for heat recovery and water treatment complete the total system. These perfectly matched components increase energy efficiency and ensure an operation with optimised service life.
The conception and planning of this pioneering system was undertaken by the consultant engineers Ingenieurbüro Dickert. The fitting and the installation of the energy system was performed by the plant construction company Auma-Tec during ongoing operation without interrupting the supply.