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APPENDIX
Validating E-PASS energy calculator with IDA Indoor Climate and Energy simulation softwareAuthor Jaakko Ketomäki1 ProcedureIn the validation process the energy consumption of the case buildings with the same specification was calculated with using the E-PASS calculator version 0.11 (http://cic.vtt.fi/epass/vtt/step_1.php) and IDA Indoor Climate and Energy simulation software.
The calculated buildings were
One family house with 120 m2 area and 1 floor
Apartment building with 2000 m2 area and 3 floors
Office building with 2000 m2 area and 2 floors
The simulation was done using the typical constructions and building services defined in E-PASS. 13 different buildings were taken into account in decades 1910-2017 and moreover one building from decade 1961-19701 was improved by using the constructions of a 2011-2017-building.
Simulation models of the building can be seen in Figures 1-3.
Figure 1. Simulation model of a single house
Figure 2. Simulation model of an apartment building
Figure 3. Simulation model of an office building
2 ResultsThe of the energy calculations results are presented in Figures 4-9
<191
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1911
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1961
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2011
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nZEB
1961
-197
...
0.05.0
10.015.020.025.030.035.040.045.0
Single house (E-PASS)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 4. Energy consumption of a single house calculated using E-pass
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2011
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7
nZEB
1961
-197
0...
0.05.0
10.015.020.025.030.035.040.045.0
Single house (IDA-ICE)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 5. Energy consumption of a single house simulated using IDA-ICE
<191
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1911
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1921
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1981
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2011
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nZEB
1961
-197
...
0
100
200
300
400
500Apartment (E-PASS)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 6. Energy consumption of an apartment building calculated using E-pass
<191
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1911
-192
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1921
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1931
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1941
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1961
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2011
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nZEB
1961
-197
0...
0
100
200
300
400
500Apartment (IDA-ICE)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 7. Energy consumption of an apartment building calculated using IDA-ICE
<191
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1911
-192
0
1921
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1931
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1941
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1981
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2011
-201
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nZEB
1961
-197
0...
0.0
100.0
200.0
300.0
400.0
500.0Office (E-PASS)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 8. Energy consumption of office building calculated using E-pass
<191
0
1911
-192
0
1921
-193
0
1931
-194
0
1941
-195
0
1951
-196
0
1961
-197
0
1971
-198
0
1981
-199
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1991
-200
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2001
-201
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2011
-201
7
nZEB
1961
-197
0...
0.0
100.0
200.0
300.0
400.0
500.0Office (IDA-ICE)
Electricity recidentCooling energyDHWSpace heating
Ener
gy (M
Wh)
Figure 9. Energy consumption of office building calculated using IDA-ICE
3 ConclusionsIn can be seen, that the calculated energy consumptions calculated using E-PASS and IDA-ICE are in line. Because the method of the calculation is different there are also some differences between the results.
However, the difference between the energy consumption calculated with different methods is in most cases below 10%, which is a satisfactory result. Typically the absolute difference remains on the same level. Thus the relative difference is higher in the cases, where the energy consumption is low (2011-2017 and ZEB).
In addition, one case with improvements was calculated and the building from years 1961-1970 was improved by using 2011-2107 constructions. In this case the difference between calculation methods was the same as in other cases.