Objective
The aim of the project was to replace an old coal boiler system with a calorific value boiler for gas. The use of gas, at the same time improving of the building insulation, the heat supply to surrounding buildings and the integrated use of building automation systems shall proof, that this combination of individual solutions can appreciably reduce the amount of primary energy and at the same tiem can considerably improve the environmental situation in Dresden. The economical aspect will be proven during the trial and measuring stage. A positive result will persuade many customers to benefit from this project and follow the same approach in modernisation of their plants. Exploitation of all technical possibilities like DDC technique, building automation systems, energy management system and detailed maintenance plans will give an esteem of the maximum possible cost savings.
During the years 1988, 1989 and 1990, th cost to run the old coal boiler plant was 104,111.00 DM per year.
During the trial a measuring phase in 1993 and 1994 the following result was established :
In 1993 propane gas was used as primary energy. Heating costs were 23,886.00 DM. This infers a cost reduction of 80,225.00 DM per year. In 1994, when gas became available in Dresden, the plant was connected to the town's gas supply. Due to the low price for gas, the yearly costs could be lowered to 16,968.00 DM. In relation to the origin, this leads to a yearly cost reduction of 87,143.00 DM. In the scope of the energy balance it its proven, how energy consumption, plant efficiency and heat production developed cost economical and environmental friendly from 1988 to 1994.
This project was implemented in the company building of Haustechnik Dresden GmbH in Dresden. The old boilers were 2 coal boilers with 150 kW each and had together a yearly energy consumption of:
Approx. 107 to lignite (brown coal)
Approx. 108 to raw lignite
Approx. 37 to pit-coal
The average efficiency was 48%.
An outdoor temperature dependent control was not installed. The heat resistance of the consisting building was 1.67 W/qmK (1.243 W/qm). In the first step, this was improved to 0.84 W/qmk (0.039 W/qm) by additional insulation of the building.
As a result, the necessary boiler power was 160 kW provided by two gas boilers of 80 kW each. Due to the temperature stretching between departure and return temperature from 70 deg. C to 45 deg. C at a minimum outdoor temperature of minus 16 deg. C, the heat recovery by means of staying under the dewpoint is guaranteed.
In 1993 the average efficiency rose to 97.4% in 1994 to 100%.
Instead of the 30 meters high brick chimney, the new boiler plant is connected to two stainless steel chimneys of 8 meter height each.
To allow for an economical and functionally safe operation, the complete plant is controlled by means of a building automation system.
To organize preventive maintenance, the plant manager uses a PC-programme, evolved out of long experience.
An energy management system programme together with the building automation system produces trhe necessary weekly energy balance.
The boiler plant delivers heat to the surrounding buildings and opens up a complete new market range.
The sequence of the project follows the five stages :
1. Planning and engineering 6 weeks
2. Construction of the plant 20 weeks
3. Insulation of building sleeve 12 weeks
4. Running of the plant and
energy management 108 weeks
5. Trial and measuring 96 weeks
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Coordinator
01157 Dresden
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.