SUPERVISOR: A.M.PAPADOPOULOS

SCHOOL OF SCIENCE & TECHNOLOGY

Tzouliana Kraia

MSc in Energy Systems – October 2011

Renovation Vs New Construction‘’ An Integrated Comparison’’

Presentation Outline

Green Construction Use of energy Sustainability in the built environment Renovation Vs New Construction Important Interventions Renovation /Reconstruction Demolition Listed Buildings: “A special case of buildings’’ Energy and Listed Buildings Study building Building Characteristics Interesting architectural elements Major interventions can be done Results

Green Construction

By Using: New systems Technologies Materials Renewable energy sources

High energy efficiency and effective environmental protection

This effort concerns the whole society, because there are significant benefits in every level, throughout the building’s life cycle and for all stakeholders

Use of Energy Sustainability in the Built Environment

It is worth mentioning that in Europe: The energy consumption in buildings represents

approximately 41% of energy produced Approximately 45% of global CO2 emissions come from

buildings CO2 affects at the creation of the ‘’greenhouse effect’’ and

global climate change

Use of Energy Sustainability in the Built Environment

Building and construction sector is strongly

related to economy, community, health and

environment

This is the reason why major worldwide investments are

related to buildings / constructions

22%

21%

30%

23% 4%

Worldwide investments in the building and construction sector

north America Japan Europe Developing Countries

Other Developed Countries

Renovation Vs New Construction

In order to study a building it is important to consider the

extent of an intervention

Interventions categories:

1. Cleaning

2. Maintenance

3. Repair

4. Restoration

5. Renovation

6. Reconstruction

Important Interventions

Renovation: Renovation combines the features of simple

maintenance and repair. However, it has to renew the

building - or part of the renovated

Reconstruction: When we use new materials in a new

application without changing its original form, then we have

reconstruction

New construction: Refers to site preparation and construction

of entirely new structures and significant extensions to

existing structures whether the site was previously occupied

Demolition: Is the act of deliberately destroying it, often in

order to build something else in its place

Renovation /Reconstruction

Rapid rise in the reconstruction of old houses reported in the

last months where the real estate crisis has been extended

enormously

The greatest demand are the houses of 30 years and over, due

to their extremely cheap price

The cost of the reconstruction may be up to 100% of the

house’s value.

An ageing house, in its current situation, loses its value rapidly

For each decade that passes, a building loses 12% of its value

So, a house in order to be sold at a half price than a new one

should be no more than 40 years old

Demolition

Demolition Methods

Demolition DeconstructionMost commonly used

method.In populated areas is usually, the method of top-down demolition

The reverse procedure fron construction. The purpose is to restore building materials (reuse/create new). Begins from inside to outside, top to bottom.

Waste from excavation, construction and demolition is

any material or object resulting from these processes

Generated during processes such as construction/demolition

of buildings at the end of their useful life, renovation or

aesthetic and functional upgrades, as well as disasters caused

by extreme weather events

Listed Buildings: ‘’A special case of buildings’’

Building complexes, individual buildings, parts of buildings, as well as

elements of the environment of these can be classified as listed due to

their special historical, artistic, scientific, planning, architecture,

folklore, social and aesthetic value and their character

Specifically

A building dating before 1830, is an ancient monument and falls

within the responsibility of Ministry of Culture and the Status of Law

3028/2002

A building dating after 1830, is under the responsibility of Ministry of

Culture and of the Ministry of Environment, protected by the provisions

of the General Building Rules (Law 1577/1985, as amended by Law

2831/2000) and can be declared as a listed

Energy and Listed Buildings

Listed buildings are often excluded from technological and sustainable development, due to strict/complex laws and planning frameworks

Characteristics of listed buildings

Energy Characteristics

Large internal heights/increased volumes

Effective cooling behavior. Possibly increased demand for heating

Increased thermal mass and thickness of walls without insulation

Large thermal storage capacity

Controlled power and limited openings

Control of indoor temperatures, envelope quality

Windows and openings recessed

Control of solar gains and natural lighting

External overhangs, planting, patio

Shading of the construction, better sun protection

Energy and Listed Buildings

ENVELOPE

IMPROVEMENTS

INTERNAL ENVIRONMENT IMPROVEMENTS IN H/M

SYSTEMS

INTEGRATION OF

RENEWABLE ENERGY

SYSTEMS

Replacement/repair/

improvement of windows

Reflective panels behind radiators

Modernization of lighting Solar panels for domestic hot water

Insulation of ceilings and

floors, internal walls

'Heavy' curtains to reduce heat loss

Geothermal heat pumps for heating / cooling

Photovoltaic’s integrated into roofs and sloping surfaces

Reuse skylightsInstalling ceiling fans Upgrading heating / cooling

systemUtilization of biomass

……AND CHANGES IN USER’S BEHAVIOR

Study Building

Located in the most central area

of Thessaloniki

Characterized as listed:

Gaz.128/B/23/3/1983

It’s a representative sample of

eclectism with interesting

architectural elementsThe intervention regards:1. Reconstruction/enhancement2. Configuration / renovationBuilt:1900-1906Saved from: Fire 1917, Earthquake

1978Owner: Jewish Community of

Thessaloniki, 1937

Building Characteristics

The access to the building studied is from Venizelou Street

The building has two floors

The connection of the basement to the

ground floor done through staircase

The appearance at Saint Minas street and the

entrance to the main staircase kept in moderately

poor condition, since the first intervention,1997

Interesting Architectural Elements

Major Interventions Can Be Done

Demolition of all additions, toilets and hygienic facilities, air

conditioning equipment, piping network, utilities

Demolition of loose coatings and carved decoration

Repair and restore of the original form of the building in Saint

Minas Street

Repair and configuration of ground floor, staircase, mezzanine

and 1st floor.

Checking and repairing of the roof

Installing of new internal network facilities

Installing of air conditioning system

Restoration of the facade

Results

Previous use (Hondos) Current use (Plaisio)

No insulation Insulation (stone wool)75-100kg/m3

Wooden frames/single glazed window(mezzanine & 1st floor)

Wooden frames /double glazed window (mezzanine & 1st floor)

Aluminum frames /single glazed window (ground floor)

Aluminum frames /double glazed window (ground floor)

Granite tiles (basement- ground floor)

Specific carpet, which Plaisio uses in its shops.

Parquet (mezzanine & 1st floor) Specific carpet, which Plaisio uses in its shops

13 Fan coils Roof Fan coil (water chiller)

Results

Purpose of engineers was the completion of the reconstruction of the building until late December 2011

Not possible due to problems(part of the load bearing structure need reinforcement) have arisen during the demolition process and the start of the process of reconstruction that caused new interventions

1. A lifting of concrete wall on the north side of the building for structural strengthening and security (due to the connection with Jewish museum)

2. A lifting of iron construction on the southwest side of the building for buildings equilibrium

3. Investing all of walls with a “cloak ’’ (iron construction and concrete)

Results

Assumed 2 scenarios :1. Demolition and New Construction2. Deconstruction and Renovation

1st Scenario 2nd Scenario

Demolition(5o% machinery & 50% manually)

100.000-110.000 € Deconstruction(100% manually)

20.000-23.000 €

New Construction

1.368.000 – 1.881.000 €

Renovation 1.000.000 €

Total Cost: 1.729.000 € Total Cost: 1.021.500 €

Generate: 50 tones of CO2 Generate: 15 tones of CO2