budgeting methods: payback period and net present value. The cost of capital was 20% and
22
for the economical calculations with an increased energy price. It was assumed that the
electricity price will be 25% higher in 10 years and that the district heating price will be 15%
higher [16].
4.4 Environmental Calculations
The environmental assessment of the energy saving measures has been based solely on carbon
dioxide emissions. Emission values of 600 kgCO
2
/MWh for electricity and 106 kgCO
2
/MWh
for district heating have been used. The emission value for electricity
is based on the effect of
a change in the electricity use in the electricity grid in northern Europe, so called marginal
electricity [17]. The emission value for district heating is based on the district heating mix in
Gothenburg [18].
Do'stlaringiz bilan baham: 
