The importance of the design phase in Energy Quality Management: an example of the application - PowerPoint Presentation

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The importance of the design phase in Energy Quality Management: an example of the application of the parametric analysis

Marco Molinari, Ph.D.Department of Automatic Control, KTH

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Outline

BackgroundEnergy efficiency targets in the built environment

Tools for analysis: S.E.P.E.

S.E.P.E.in practice: performance improvement with exergy analysis

GSHP improvement through integrated design Current research Conclusions

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Energy use in the

world:

the need

for reduced and more sustainable

energy use

Source: IEA 2010

Source: IEA 2011

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87%

32%

Energy and exergy efficiency

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Source:

Mure

Odyssey database

Source:

Fraunhofer

IBP

Energy supply type in buildings

Can we improve our energy management by means of exergy concepts?

Energy quality (exergy) mismatch between supply and demand indicates potential for energy management improvements

Main hindrances:

Lack of a shared understanding of the advantages of the exergy approach

No standardized exergy analysis calculation tools availableNeed for demonstration projects 5

Examples of available exergy analysis software programs: IEA ECBCS Annex 49

Human Body Exergy

Calculation

Cascadia

– An Exergetic Approach to Neighbourhood Design

Pre-Design Tool for buildings exergy

analysis

DPV

Tool

S.E.P.E

. – Software for Exergy Performance

Assessment

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S.E.P.E. HVAC components

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Generators

HPs

,

c

hillers

boilers

solar collectors

DH

Heat

exchangers

Distribution components

Ducts/pipes Fans and pumpsEmission systemsradiatorsFH

air unitscontrollersSimplified building envelope

Component example: boiler

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Example of S.E.P.E. HVAC system assembly

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Improvement of heat pumps COP performance with S.E.P.E.

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Reservoir T

0

Reservoir T

1

Reservoir T

2

Floor Heating System

DHW

Heat Exchanger 2

Heat Exchanger 3

P2

Heat Pump 2

P1

Heat Pump 1

T4

T5

T7

T8

T6

T10

T9

T11= 55°

T12= 10°C

T3

Tset

= 22°C

Heat Exchanger 1

Results

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The same physical system can achieve different performance if the subsystems are not properly matched

How to extend these results to other fields: design of ground source heat pumps

Building heated area: 8000 m

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Locations: Stockholm and Madrid

Parametric studyBuilding envelopeWalls and roof insulationBorehole fieldBorehole spacing

Number of boreholes

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http://sustainableenergysystemz.com/the-benefits-of-ground-source-heat-pumps/1679/

Results: Stockholm

Results: Madrid

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Current research at KTH: advanced control strategies

in buildings

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Conclusions

Conceptual and calculation tools for energy quality management already exist and are now mature enough to shift from research to applications

The application of exergy concepts can be highly valuable to the improvement of the design of buildings, especially in connection to parametric analysis

Examples of improved design of buildings and buildings components based on exergy principles are needed to show the potential improvements in energy quality management

Advanced controls schemes and exergy can be an innovative match to further decrease the overall energy used in buildings 15

Thank you for your attention!

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S.E.P.E. systems components layout

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Exergy VS energy or exergy AND energy?

Energy analysis alone has shortcomingsEnergy efficiency does not introduce a unique reference to show how much a system can be improved

We somehow account for the energy quality through primary energy: but how can we improve the building design without taking into account explicitly exergy?

Exergy approach is not a standardized approach

Examples of design and implementation on real buildings are limitedIt lacks standard commercial calculation software programs18

Parametric analysis

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