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Energetic efficiency in the brazilian built environment : retrofitting strategies for a hotel in Goiania.

Rel. Guglielmina Mutani, Jan Hensen, Paolo Oliaro, Daniel Costola, Claudia Amorim. Politecnico di Torino, Corso di laurea specialistica in Architettura, 2011

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Currently the world is experiencing an urbanization at an unprecedented rate. Urban centers, which are definitely thè predominant morphologic unit of thè contemporary society, are essentially collective. As citizens we have no choice but to learn how to live collectively, solving and avoiding thè main problems of our cities, therefore leading them into a sustainable behavior.

Living together in great cities couid be thè origin for many environmental problems, but this agglomeration is also a fundamental driver of innovation in our time. Due to technology and scientific development, settled indeed in thè urban environment, anything we find inconvenient is supposed to not endure. Eliminating unpieasant conditions seems to be one of thè main motivations to innovation. In order to find remarkable ideas for thè future, it is necessary to identify thè significance of these inconvenient things. Probably thè foreseeable future of our cities is to support us proactively in our day lives.

Energy remains a fundamental requirement of today's society. It is thè basis of almost everything we do today, and there is no doubt thè way its production and distribution is settled nowadays must be changed. Energy's broad concept represents thè feeding of ali production organisms in thè world, from food moving individuai to oil, gas or naturai coal, which move cities and industriai fields. Day after day this word and its strong meaning have became more elaborated: politic and environmental dimensions have been increasingly taken into account in energy's consumption and production, due to thè global changes' perception and analysis in thè last decades

Relatori: Guglielmina Mutani, Jan Hensen, Paolo Oliaro, Daniel Costola, Claudia Amorim
Soggetti: A Architettura > AO Progettazione
Corso di laurea: Corso di laurea specialistica in Architettura
URI: http://webthesis.biblio.polito.it/id/eprint/2177

How are people currently dealing with energy in the built environment?

I Opening remarks: broad research question

I.1. Energy in cities

I.2. Energy in buildings

Why and how is energetic efficiency in Braziiian buildings being supported?

II Context presentation and problem's definition

II.1. The Braziiian energetic crisis of 2001

II.2. Braziiian energy policies for thè built environment

II.3. Energy consumption in Braziiian buildings

Energy consumption in residences

Energy consumption in commerciai and public buildings

How to implement energetic efficiency in Braziiian buildings?

Design methodology and strategies

III Environmental integrated design and passive strategies

III.1. Bioclimaticzoning

III.2. Passive cooling

Naturai ventilation

Thermal mass for cooling

Evaporative cooling

Green roof

III.3. Passive heating

Implementation and orientation

Passive solar heating T

hermal mass for heating

III.4. Daylighting and envelope's shading

The Morphological Diagram for Braziiian buildings

IV Renewable energy generation in buildings

IV.1. Solar energy

Solar thermal

Photovoltaic cells

Solar cooling

IV.2. Wind energy

Domestic eolie turbines

IV.3. Earth energy

Geothermal for air cooling

IV.4. Organic energy

Biomass systems

Which are thè quantitative outeomes of this methodology?

Case study: energy efficient retrofitting strategies for a hotel in Goianla

V Context presentation

V.l. Hotels and Braziiian recent great events

V.2. Goiània: city, weather and architecture

V.3. Establishing energy consumption reference ranges

VI Buiiding's status quo

VI.l.Business hotel in Goiània: case study's building

VI.2.Simulator calibration and quality assurance (BESTEST)

VI.3.Modeling principles

VI.4.Constructions' specifications

Materials' properties

External walls

Glazed surfaces

Fiat roofs

Internai floors/ceilings

Ground-contact floor

VI.5. Uses profiles

Ground floor zone

Terrace zone

Rooms zone

VI.6. Simulation assumptions and sources of uncertainty

Buiiding's location

Opaque and glazed closures stratigraphies occurrence

Air conditioning systems

Users behavior

Internai spaces division, shafts and vertical circulation

Intern thermal mass

Underground floors

Naturai ventilation

Assumed references to end uses percentages

Congruence between simulation results and real consumption

VI.7. Simulation results and discussion

Variables involved on energy consumption

Overall daily building behavior

Cooling and heating sensible loads

Contrasting air conditioner simulated demand with real consumption

VI.8. Building's Energy Label - PROCEL Edifica

VII Retrofitting scenarios for energetic efficiency promotion

Vll.1. Reduction on buiiding's energy demand

Scenario 1 - Overhangs implementation for shading

Scenario 2 - Louvers' frames implementation

Scenario 3 - Air changes and setpoints redefinition

Scenario 4 - H&C centralized System with high efficiency

Scenario 5 - Luminous efficacy increase on lighting System

Scenario 6 - Facades' absorptances lowering and solar factor increase

Scenario 7 - Roof remodeling for buiiding's envelope Label LevelA

VII.2. System sizing for renewable energy generation

Scenario 8 - Solar thermal collectors for domestic hot water Scenario 9 - Photovoltaic cells for electricity generation

VII.3. Final Scenario - Maximum energetic efficiency Associating previous retrofitting strategies

VII.4. Resumed scenarios and discussion

VIII Conclusions



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