Microsoft Word 2012, Källén, M.,-Energy Efficiency Opportunities within the Heat Treatment Industry

4.5.5  District Heating 

The current consumption of district heating in the plant is 120 MWh/year. Even though the 

consumption would be 382 MWh/year if a planned investment is not made, all calculations 

are based on a consumption of 120 MWh/year. However, the percentages for case III in table 

10 are based on a total consumption of 382 MWh/year. The reason for this is that the 

investment for reducing the district heating demand is included in this scenario. 

Another district heating price is used for case III for the calculation of the annual savings for 

this scenario. Since this scenario includes the reduction of the district heating demand, the 

annual cost savings for removing the remaining district heating demand by heat exchanging 

the waste heat from the compressor is based on a lower district heating price. This is because 

the district heating price would decrease if the total demand was reduced. The price would 

decrease because a part of the tariff is based on the highest load during the previous year. 

 

 

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5  Results 

The results from the energy audit are presented in this chapter. First is a description of the 

current energy consumption distribution in the plant. The next sections present the possible 

energy saving measures that have been investigated during the project. The last part of this 

chapter includes the results from the evaluation of these suggestions.