Slovenia

ENERGY SAVING MEASURE #1: TR16



The district heating provider of SPEKTER has firstly implemented a hydraulic balancing of the building’s heating system in 2010. This balancing has been done in the context of annual maintenance plan of municipal district heating system.

The Energy Saving Measure was later optimised, in the framework of the AFTER project, by turning the building’s heating system to low temperature. This intervention has been implemented by changing the temperature regulation in the district-heating substation within project

 

Hydraulic balancing of the heating system efficiently ensures that the needed amount of hot water is provided to each radiator connected to the building’s heating system regardless of radiator’s location. Hydraulic balancing of the building’s heating system resulted in approx. 5% reduction of heating energy consumption.

 

Experience has shown that the majority of heating systems in multi-apartment buildings connected to district heating system in Trbovlje are oversized, especially in buildings built in the 70s of the previous century and forth. According to calculations of Energy Expert and its energy retro commissioning implemented within the AFTER activities, in the case of pilot site TR16, the heating system is oversized by a factor 4. Potential for reduction of heat loss through the pipelines due to lower temperature of the heating media was estimated to 7%.

 

Thanks to the recommendation of the SHOs, the district heating provider has turned the system to low-temperature (cf. report to see the settings).

In period 2011/12 normalized heating energy consumption was 168,528 MWh, in testing period 2013/14 158,494 MWh.  Regarding to the baseline period consumption, during the pilot monitoring period, 6% of normalized energy consumption saving was recorded leading to savings about 10, 034 MWh of natural gas.

 

Optimised ESM #1 (hydraulic balancing of building’s heating system with successive conversion to low temperature heating) with combined energy saving of 11% has a fairly high potential in SPEKTER’s housing stock, as in Trbovlje there is a variety of multi-apartment buildings with same or similar energy characteristics (e.g. thermal properties of external shell, two-pipe heating system not yet hydraulically balanced) which are either owned or managed by SPEKTER.

The potential can easily be projected on entire multi-apartment housing stock of Trbovlje or even national wide, however feasibility study for each SHO individually should be made as housing stocks, heating systems, relations with energy providers and local/regional legal requirements differentiate.

 

 

ECONOMICAL EVALUATION:

 

Total incurred costs: 12.000 EUR (AFTER optimization and retro commissioning process counting for 5862EUR) 230EUR/dwelling

Life expectancy: 15 years

ROI:: 7,3 years

 

POTENTIAL OF OPTIMISED ESM IMPLEMENTATION:

 

Buildings with similar characteristics: 19

Living units: 1.145

Total managed living units: 3.977

Predicted energy saving (entire managed housing stock): 3,17%


ENERGY SAVING MEASURE #2: TFF2a


The district heating provider of SPEKTER has firstly implemented a hydraulic balancing of the building’s heating system in 2010. This balancing has been done in the context of annual maintenance plan of municipal district heating system.

The Energy Saving Measure was later optimised, in the framework of the AFTER project, by turning the building’s heating system to low temperature. This intervention has been implemented by changing the temperature regulation in the district-heating substation within project

 

Hydraulic balancing of the heating system efficiently ensures that the needed amount of hot water is provided to each radiator connected to the building’s heating system regardless of radiator’s location. Hydraulic balancing of the building’s heating system resulted in approx. 5% reduction of heating energy consumption.

 

Experience has shown that the majority of heating systems in multi-apartment buildings connected to district heating system in Trbovlje are oversized, especially in buildings built in the 70s of the previous century and forth. According to calculations of Energy Expert and its energy retro commissioning implemented within the AFTER activities, in the case of pilot site TR16, the heating system is oversized by a factor 4. Potential for reduction of heat loss through the pipelines due to lower temperature of the heating media was estimated to 7%.

 

Thanks to the recommendation of the SHOs, the district heating provider has turned the system to low-temperature (cf. report to see the settings).

In period 2011/12 normalized heating energy consumption was 168,528 MWh, in testing period 2013/14 158,494 MWh.  Regarding to the baseline period consumption, during the pilot monitoring period, 6% of normalized energy consumption saving was recorded leading to savings about 10, 034 MWh of natural gas.

 

Optimised ESM #1 (hydraulic balancing of building’s heating system with successive conversion to low temperature heating) with combined energy saving of 11% has a fairly high potential in SPEKTER’s housing stock, as in Trbovlje there is a variety of multi-apartment buildings with same or similar energy characteristics (e.g. thermal properties of external shell, two-pipe heating system not yet hydraulically balanced) which are either owned or managed by SPEKTER.

The potential can easily be projected on entire multi-apartment housing stock of Trbovlje or even national wide, however feasibility study for each SHO individually should be made as housing stocks, heating systems, relations with energy providers and local/regional legal requirements differentiate.

 

 

ECONOMICAL EVALUATION:

 

Total incurred costs: 12.000 EUR (AFTER optimization and retro commissioning process counting for 5862EUR) 230EUR/dwelling

Life expectancy: 15 years

ROI:: 7,3 years

 

POTENTIAL OF OPTIMISED ESM IMPLEMENTATION:

 

Buildings with similar characteristics: 19

Living units: 1.145

Total managed living units: 3.977

Predicted energy saving (entire managed housing stock): 3,17%

ENERGY SAVING MEASURE #3: SC9b


Experience has shown the majority of heating systems in multi-apartment buildings connected to district heating system in Trbovlje are oversized.

According to calculations of Energy Expert, in the case of pilot site Savinjska cesta 9b, a new low energy building according to project AFTER (consumptions for heating lower than 50kWh/m.a), the heating system is oversized by a factor 3, taken into account the building is not hydraulically balanced.

Reduction of heat loss through the pipelines due to lower temperature of the heating media was estimated to 5% for a building of this age.

 

Optimised pilot site (change of temperature regulation of building’s heating system with simultaneous hydraulic balancing of building’s heating system with conversion to low temperature heating) with average combined energy saving of 21% has a fairly high potential in SPEKTER’s housing stock, given the fact mentioned in first paragraph. Compared to the 3-year average value of the baseline period, the figures lead to a fewer consumption of 9 MWh/a or 12.2 kWh/(m²a) during the period after the optimisation which equals a reduction of 21 %.

In SPEKTER’s housing stock and in Trbovlje there are many multi-apartment buildings with oversized heating system and with inhabitants with low awareness, overheating their apartments.

 

The potential can easily be projected on entire multi-apartment housing stock of Trbovlje or even national wide, however feasibility study and Energy Expert calculation for each SHO and each building individually should be made as housing stocks, heating systems, relations with energy providers and local/regional legal requirements differentiate as well as building’s characteristics vary.

 

In case of a newly built building, optimised low temperature heating system can be already considered in design phase of the building, making costs of particular optimisation even lower.

 

ECONOMICAL EVALUATION:

Total incurred costs (optimisation): 800 EUR

Life expectancy (optimisation): 20 years

ROI: 1 year

 

POTENTIAL OF OPTIMISED ESM IMPLEMENTATION:

Share of housing stock: +50%

Living units: +1.900

Total managed living units: 3.977

Predicted energy saving (entire managed housing stock): +10%