Energy Consumption
Calculations
Group 4a
Contents
1.
2.
3.
4.
Introduction
Methods
Tools
Country specific variations
a. Finland
b. Other Nordic countries
c. Italy
1.Introduction- Why calculate energy consumption?
-
EU (EU Energy Efficiency
Directive (2012/27/EU)
-
Cost savings (during lifetime design process might be more
costly... )
-
Reduction of CO2 emissions
1.Introduction - Drivers for energy consumption
- Demand for comfort levels
- Time spent inside the buildings
- Income growth
- Building size and service demands
- Energy prices
- Energy efficiency of the building
- Population growth
- Climate
- etc….
2. Methods, Calculation by hand
- E-value = kWh / m2
- Elements in the calculations:
● Water consumption and hot water
● Electricity consumption
● Energy consumption of air conditioning
● Thermal load of the building
● Energy efficiency of windows
2. Methods, Computer based simulation
- Several different simulation programs
- Inputs
- Facility space information
- Types of energy used
- Time period and energy data
- The costs associated
3. Tools 1/4: IDA-ICE
- Dynamic energy simulation tool that can be used for calculating:
● total energy consumption / CO2 emissions
● energy balance & indoor air conditions
● heating, cooling & ventilation capacities
- Owned and marketed by a Swedish company EQUA.
- Based on building geometrical description, which can be brought from a
drawing programme, e.g. AutoCAD
Parameters (input)
Results (output)
3. Tools 1/4: IDA-ICE
Heat balance
3D model
3. Tools 2/4: RIUSKA
- Also a dynamic programme that can be used for simulating energy
consumption, indoor air conditions, heat losses and heating and cooling
capacities.
- Developed by a Finnish company Granlund, DOE-based.
Linked with MagiCAD.
- Based on building 3D model, which can be drawn with MagiCAD or brought
from another programme
- Parameters (structures, equipment, loads and schedules) determined by the
user.
3. Tools 2/4: RIUSKA
Yearly energy consumption
Indoor air temperature for alternative windows and shades
3. Tools 3/4: CADS Planner Hepac
- Finnish market leader of HVAC designing and documentation.
- Data based modelling and calculation for
➢ ventilation
➢ heating
➢ piping
➢ building automation
- 2D work drawings and 3D models.
- Good tool to gather information needed for energy report and audit.
3. Tools 3/4: CADS Planner Hepac
3. Tools 4/4: EnergyPlus
-
U.S. Department of Energy’s building energy and performance
simulation program.
-
For engineers, architects and researchers.
-
Modelling
● energy consumption for
➢ heating, cooling, ventilation, lighting
● plug and process loads
3. Tools 4/4: EnergyPlus
-
Console based program.
-
Energy plus doesn’t include ‘userfriendly’ graphical interface.
-
Output data for third-party graphical
user interfaces
●
DesignBuilder
●
EFEN
●
gEnergy
●
N++ and lots more
4. COuntry Specific variations / Finland
E-value is a constructive daily per capita
consumption of purchased energy
(kWhE/m2a) weighted by coefficients
defined by the energy forms used.
Coefficients for different energy forms (Finlex 2013):
Electricity
1,7
District heat
0,7
District cooling
0,4
Fossil fuels
1,0
Renewable fuels
0,5
4. COuntry Specific variations / Nordic countries
● Calculation methods similar – only small differences
● Finland and Norway
- Elemental approach
● Denmark and Sweden
- Design value from delivered energy
4. COuntry Specific variations / sweden
● Swedish building code (BBR
2009)
● Standard depends on:
- Climatic zones I, II and III
- Non-electric or electric heating
4. COuntry Specific variations / italy
Italian legislation : UNI/TS 11300
The limit of energy performance index is a function of:
- Climate zone (A...F)
- Volume of the building
Software: EDILCLIMA EC700, Calculating the energy performance of buildings
Thank you!