Germany – Central-heating installation work – 040-01 Heizung

The existing heating system is located in the basement of the middle school and will be dismantled at the end of the renovation work. The dismantling work includes a cellar-welded oil tank with approximately 17,000 liters capacity including the oil filling and venting pipes, which is located next to the intermediate building of the administration in the basement. Furthermore, the gas boiler system approximately 460 kW and the oil boiler system approximately 405 kW must be professionally decommissioned and dismantled. The existing combined heat and power plant (BHKW / 80kW thermal / 50 kW electrical) is located in the basement of the middle school and remains in this position; it will be reintegrated into the new system. The new heating system is located in the basement of the new extension building of the middle school and consists of two biomass boilers with a capacity of approximately 450 kW each. The operation of the boiler systems will be carried out with both wood chips and pellets, so that the client retains both options. The exhaust system of the two biomass systems is also to be created. The bunker system will be implemented with two separate agitators (bunkers) one for each boiler. The new heating centre with the mentioned heat generators includes the operation of several buildings (various school and non-school buildings), currently these connected buildings are also supplied by the heating centre of the school Waging. The old heating system will only be dismantled when the new heating system is fully operational, thus ensuring continuous operation for the consumers by the supplier. The new buildings of the primary school, OGTS 1-4, administrative building, extension of the middle school OGTS 5-10 with auditorium/break hall and dining room will also be supplied by the new system. In the new technical centre there are four heating buffer storage tanks with a volume of 7,000 litres each, these must be installed before the ceiling above the basement is set. Furthermore, the technical centre contains the following components and materials such as degassing/pressure maintenance with make-up, thermally separated heating distributor for 11 outlets from DN 40 – DN 125 incl. pumps, fittings, thermal insulation, dirt separators, sensors, installation of MSR mixing valves and valves, thermometers, flow control valves and various nameplates. The pipelines by means of threaded pipe medium-heavy welded from DN 15 – DN 125 + fittings, fire stops, nameplates, drainages and fillings as well as tightness tests and sampling of the heating water. For the connection of the intermediate building of the middle school administration from the heating centre, a district heating pipe will be laid in the ground, this consists of two single pipes. The heating-side connection (flow and return to the heating registers) from the heating centre to the five ventilation units is also to be established. The heating-side supply (space heating surfaces) of the new buildings will be carried out by means of underfloor heating. Underfloor heating with approximately 24,000 m of system pipe, approximately 3,500 m² of system plate, edge insulation strips, no tacker/velcro system, approximately 440 clamp ring connections, pipe guide bends, protective sleeves + other components, 21 heating circuit distributors and distribution cabinets from 4 – 14 heating circuits, adjustment and labelling of the heating circuits in the distributors (hydraulic balancing), installation of client-supplied actuators, contact heating/functional heating of the screed in several construction sections with a provided and programmed control system for controlling the pump, mixer and sensor. Further project-related requirements are the site setup, mobile scaffolding, steel structures and fastenings, sealing of wall and ceiling penetrations with fire protection requirements, training of client's personnel, creation of protocols such as tightness test, analysis of heating fill water, commissioning. Installation of components via installation shaft (except buffer storage tanks in advance), creation of as-built drawings and as-built documentation, maintenance services, hydraulic balancing, coordination services and interfaces of the further trades such as MSR, sanitary, ventilation, electrical. Connection from the new heating distributor to the existing outlets of the consumers in the basement.