Energy Consumption Calculations

Group 4a

Contents1. Introduction2. Methods3. Tools4. Country specific variations

a. Finlandb. Other Nordic countriesc. 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

● water use in buildings

- Console based program.

- Energy plus doesn’t include ‘user-friendly’ graphical interface.

- Output data for third-party graphical user interfaces

● DesignBuilder

● EFEN

● gEnergy

● N++ and lots more

3. Tools 4/4: EnergyPlus

4. COuntry Specific variations / FinlandE-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!