As of: February 27, 2024, 12:00 p.m
By: Sebastian Tauchnitz
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The FOS/BOS is connected to the Weilheimer Stadtwerke district heating network.
© Marijan Murat / dpa
The district wants to manage its own properties in a climate-neutral manner by 2035.
That's why the district committee is now working intensively on how the FOS/BOS in Weilheim should be heated in the future.
District
– With Andreas Scharli from Energiewende Oberland, the district office brought a renowned expert on board.
He also presented the results of the investigations to the district committee.
The huge building is currently heated by a single gas heater and supplied with hot water.
Around 1,300 kilowatt hours of natural gas are burned per year - with the corresponding CO₂ emissions.
The gas heater itself was built in 2019 and was purchased at that time because the other heater was defective.
Seen in the light, the new boiler is still comparatively new and far too good to be discarded.
This was taken into account in the overall assessment.
According to Scharli, several variants were investigated.
Firstly, a pellet heating system for base load, which is supported by the existing gas heating system during peak times.
A similar system is used in the new vocational school.
According to Scharli, installing an appropriately sized pellet heater in the FOS/BOS would cost around 220,000 euros.
Of this, 66,000 euros would be funded, and annual maintenance would be around 108,000 euros.
“We not only included the costs for the pellets and natural gas, but also some caretaker hours,” says Scharli.
Pellet heating also requires a lot of effort, for example when the ash has to be removed.
In the end, this variant would save 74 percent of CO2 compared to today.
Huge basic fee for pure district heating supply
The second option examined was the connection to the district heating network of the city of Weilheim.
The corresponding lines would already be on Kerschensteiner Strasse and the connection would be easy.
However, according to Scharli in the committee, a supply of 100 percent district heating would cost a lot of money.
Less because of the cost per kilowatt hour, but above all because of the high basic fee, which would be 36,000 euros per year.
In the end, variant 2 would result in investments of 80,000 euros, of which 24,000 euros would be funded.
The annual costs, including the basic fee, would be 146,000 euros, according to the expert.
The CO2 savings would be the highest at 85 percent.
That's why a third variant was also examined.
The base load, i.e. 90 percent, comes from district heating.
However, this is supplemented by peak load compensation via the existing gas heating system.
According to Scharli, this would be the cheapest option in terms of costs.
As with variant 2, the investments are 80,000 euros, of which 24,000 euros would be funded.
However, for reasons that were not explained in detail, the basic fee for district heating is only 14,000 euros.
This makes a total annual operating costs of 122,000 euros including the required natural gas.
The CO2 savings with this variant would be 78 percent, which is still higher than with the pellet variant.
Heat pump would have been the most expensive
In comparison, variant 4 was less attractive, in which the 90 percent base load would be produced via an air-water heat pump, which would be supplemented by the existing gas heating system.
The investment for this would be 380,000 euros, of which 114,000 euros would be funded.
Since the PV system on the roof of the FOS/BOS is managed by EVA and there is no further capacity for sensible PV use, the electricity for the heat pump would have to be purchased, says Scharli.
That's why the annual operating costs would ultimately be 132,000 euros and the CO2 savings would be a measly 32 percent.
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In the end, Scharli spoke out in favor of the cost-effective option 3 – district heating in combination with gas for peak loads.
The district committee unanimously followed his recommendation.
The new heating system should be in use as early as next winter.