energy efficiency survey of theganado advocates head office

8/12/2019 Energy Efficiency Survey of theGanado Advocates Head Office

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Energy Efficiency Survey of the

Ganado Advocates Head Office

Antonino Fabio Agosta

Giovanni Luca Dierna

Marco Gileppo

Baldassare Capodici

Federica Anna Maria Geremia

Charles Yousif

Jotham Scerri Diacono

SUSTAINABLE ENERGY 2014: THE ISE ANNUAL CONFERENCE

Thursday 20stMarch 2014, Dolmen Hotel, Qawra, Malta


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Background on GANADO Advocates

The law firm of GANADO Advocates - born within

the building situated at 171, Old Bakery Street,Valletta.

The building at 171 served as a legal office since the

beginning of the 20thcentury.

A firm with a long tradition with many distinguished

lawyers having practised law as members of the

firm, a number of them becoming judges or taking

prominent positions. The firm has grown from a loose arrangement of

collaborating lawyers to a structured association of

65 lawyers and around 60 supporting personnel.


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Growth

Growth in numbers required additional office space.

Opportunities to acquire adjoining buildings weretaken to enable lateral and rear expansion.

The newly acquired buildings required substantial

renovation that was painstakingly carried out over

the last 3 years.

Renovation also extended to the offices at 171 .

Renovation gave an opportunity for modernisation

and that in turn enabled the firms management toconsider measures to be more efficient and also to

tap renewal sources of energy.

Office floor space grew to 1800 square m.


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Going Forward

Ongoing collaboration (on other projects) between

members of the firm and Ing Charles Yousif of theInstitute for Sustainable Energy, led to the suggestion

for the firm to carry out an energy audit as part of

the project RenewableEnergy Scenarios in Islands,

co-financed by the the Operative Programme Italy-Malta 2007-2013.

The audit took place in November 2012 and a report

released.

A number of recommendations made to the firm

have been implemented and are in the process of

being implemented.


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General considerations

This exercise was carried out as part of the exchange of experiences between

Malta and Sicily, forming part of the activities of the R.E.S.I. Project

(Renewable Energy Scenarios in Islands), funded under the OperativeProgramme Italy-Malta 2007-2013. The partners were:

o Provincia Regionale di Ragusa (Italy)

o Provincia Regionale di Agrigento (Italy)

o MRA-Malta Resources Authority (Malta)

o Institute for Sustainable Energy - ISE of University of Malta (Malta)

The energy study was carried out on the Ganado Advocates Buildings No. 171

Old Bakery Street and 59 Strait Street, Valletta on 27 and 28 November 2012.

Provincia Regionale di Ragusa

Provincia Regionale di

Agrigento


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General considerations

The exercise involved a walk-through survey of:

the electrical appliances used (PC, printers, etc.);

the lighting system;

the heating and air conditioning systems;

the building envelope;

air circulation.

The purpose of this study were to identify opportunities to:

Increase energy efficiency Improve indoor comfort levels

Install renewable energy systems


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Overview of presentation

Energy audit: electrical consumption

Energy audit: building envelope

Energy audit: PV system

Conclusions


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Structure Ganado Advocates

Fourth FloorEntrance 171

Intended for Sectors Administrationand HR

Third FloorEntrance 171

Intended for Sectors IT and for

Kitchen

Third FloorEntrance 59

Intended for Sectors Investment

Services and Funds, Insurance and

Pensions and Company Secretariatand Governance

Second FloorEntrance 171

Intended for Offices, Shipping,

Corporate,Litigation

Second FloorEntrance 59

Intended for Library and for SectorsBankinginternational,Shipfinance

First FloorEntrance 59

Intended for Sector Accounts

Ground FloorEntrance 171

Intended for Reception

The data collection was carried out in the following floors and areas:


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Analysis of equipment and electrical consumption

The operation of data collection and processing were performed

in the same sequence:

collection, organization and analysis of data on electrical

equipment distributed by type related with nameplate

capacities and electricity consumption;

analysis of the building envelope (walls, windows and roof);

photovoltaic system.


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Some equipment in the building:

hot / cold water dispencers;

paper shredders;

multifunction printers;

PC.


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Some equipment in the building:

luminaires;air-conditioners.



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Electrical equipment Average operating time

Typology Quantity Hours

PC laptops n91 8h

Air conditioners n34 4h

Multifunction printers n6 2h

Paper shredders n3 2h

Water dispensers hot/cold n2 6h

Neon lights n75 6h

Printers inkjet n22 1h

Televisions n4 1h

Microwaves n2 1h

Fridges freezers n1 3h

Coffee machines n2 1hToasters n2 1h

Dishwashers n1 1h

List of electrical equipment distributed in the various floors of the building, their

rated power and the average consumption associated with them.


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Summary and electric power consumption per floor and total building.

4th Floor 171 Administration Total kWh/y 11678.480

HR Total Power Floor (kW) 16.310

3rd Floor 171 IT Total kWh/y 12334.416

Kitchen Total Power Floor (kW) 20.629

3rd Floor 49 Investment Services and Funds Total kWh/y 9204.640

Insurance and Pensions Total Power Floor (kW) 51.220

Company Secretaried and Governance

2nd Floor 171 Offices Total kWh/y 64390.304

Shipping Total Power Floor (kW) 85.976

Corporate

Litigation

2nd Floor 49 Library Total kWh/y 25768.336

Banking international Total Power Floor (kW) 35.074

Ship finance

1st Floor 171 Accounts Total kWh/y 7282.000

Total Power Floor (kW) 9.950

Ground Floor 171 Reception Total kWh/y 5167.360

Total Power Floor (kW) 6.980

Roof 49 Central air conditioning system Total kWh/y 108275.200

Total Power (kW) 153.800

Whole building All electrical systems. Total kWh/y 244100.736

Total Power All Floors (kW) 379.939


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Graphics power consumption of floors 3rdand 4thfloors

Total kWh/y = 11678.480

Total Power Floor (kW) = 16.310

Total kWh/y = 12334.416




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Graphics power consumption of floors 2ndand 3rdflorrs

Total kWh/y = 9204.640


Total kWh/y = 64390.304



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Graphics power consumption of floors 1stand 2ndfloors

Total kWh/y = 25768,336

Total Power Floor (kW) = 35,074

Total kWh/y = 7282,000

Total Power Floor (kW) = 9,950


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Graphics of power consumption for the ground floor and central

air conditioning system

Total kWh/y = 5167.360


Total kWh/y = 108275.200

Total Power (kW) = 153.800

Central air conditioning system


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Charts the total annual electricity consumption

Total kWh/y

(*)

= 244100.736 Total Power for all Floors (kW) = 379.939

(*) Estimate based on the power and duration of operation

87% for the use of air conditioners;

7%due to the use of laptops;

3%for the use of printers.

Results of the analysis for equipment


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Problem Solution Achievable improvement

Failure on/off switch neon

light in some places even

in the presence of sufficient

natural light and in

absence of people

Check and ad just the brightness and

human detection system sensors

Good home automation system with

dimming lights according to outdoor

lighting/presence of people. Switching to

manual control forspecific needs

Best visual comfort in

environments

Energy savings due to the use of

optimal external light source

Some rooms had poor

lighting: e.g. library

Install LED systems more efficient and

warm light diffused inside the library

Best visual comfort in

environments

Non-uniform temperatures

in some areas and

workrooms

System for enabling/disabling of the

machines according to the presence

Control systems for control zone

Refer to intervention on the building

envelope: work on walls, windows and

insertions screens where required (for

the case in summer)

Saving energy with optimization of

power consumption

Superior environmental comfort

Energy Audit: Observations and improvements

List of interventions and suggestions for improvement of the management ofconsum tion.


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Energy Audit: evaluation of external envelope

Heating and cooling

Problem:possible critical situations in summer, particularly below

the top floor because of a poor roof insulation.

Solution:Roof insulation can be retrofitted, through the installation

of polyurethane foam panels that have very low thermal

conductivity, as well as using light colors on their outer surface or

even reflective surfaces. This translates into savings of electricalenergy for heating in winter and for cooling in summer.


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Coverage

Problem: The cover is not well insulated.

Solution: hot roof for the laying of theinsulation between two layers of waterproofing,

the first acts as a vapor barrier, the second is

used instead to protect the insulation from

water.

External walls

Problem: to improve the thermal resistance of

the outer casing.

Solution: installation of a "thermal insulation"

polystyrene 5 cm (strips).The system of insulation is used to coat the

outside of the facade, in order to save

significant amount of energy required for

heating and cooling.

Energy audit: evaluation outer casing


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Windows

Problem: to further improve the thermal

efficiency.

Solution: replace existing fixtures with PVCframes of the latest generation or aluminum

with thermal break that guarantee good

performance for thermal insulation.

Energy audit: evaluation external envelope


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Energy audit: Indoor air quality assessment

Indoor environment quality

Problem: the buildings are fairly closed despitethe presence of many windows, so some areas

could have stale air.

Causes: over-crowding of staff in certain offices.

Solution

replacing windows with open balconies, toenhance circulation of air and also a greater

flow of light to those environments.

addition of a glass cover with automated

horizontal openings, to utilise the courtyard and

turn it into a waiting room and reception. Toenhance the freshness of the air of this

courtyard, one can add vertical climbing greenery.


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Energy audit: windows and wall-to-green


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Energy audit: photovoltaic system

The firm Ganado & Associates Advocatesexpressed its willingness to increase

its sensitivity to the environment as well as to increase their energy savings,

given that the estimated consumption currently amounts to approximately245,000 kWh / year.

Despite the presence of shading due to the presence of surrounding buildings,

it would still be possible to install PV systems coupled to power optimisers or

micro-inverters.

E dit h t lt i t


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Energy audit: photovoltaic system

Solution

The use of micro-inverters or power optimisers enables the use of different

parts of the roof without having to pass long dc cables from one side toanother.

In fact, consider a tilt over 5 by installing panels on a single aquifer, would

result in a high height of the supporting structure, resulting in a visual impact

to the beautiful surrounding neighborhood. From the simulations done at

constant azimuth: 138 tilt and 0, 5, 10 and 15, it turns out that the best

compromise in relation to the production of the PV system, the height of the

supporting structure and the visual impact , is to tilt the panels of 5.

In order to achieve the

greatest possible power

we have sought a

compromise betweenthe inclination, the

number of panels and

the aesthetic impact.

E dit 8 kW h t lt i t


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Energy audit: 8 kWp photovoltaic system

Simulation 8 kWp PV system and 18 kWp PV plant with an annual production

estimated at 39.5 MWh, compared to an estimated requirement of 245 MWh in

energy by the audit so as to obtain a saving of 16.12%.

0,530,62

0,9

1,15

1,41,44

1,52

1,33

1,07

0,87

0,610,51

Jan Feb Mar Apr May June July Aug Sept Oct Nov Dic

PV 8 kWp - Estimated monthly energy

MWh

Estimated yearly energy: 27,586 MWh

E dit 18 kW h t lt i t


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Energy audit: 18 kWp photovoltaic system

1,231,42

2,07

2,66

3,23 3,323,51

3,08

2,48

2,01

1,41,18

Jan Feb Mar Apr May June July Aug Sept Oct Nov Dic

PV 18 kWp - Estimated monthly energy

MWh

Estimated yearly energy: 11,954 MWh

E dit i t i PV


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Energy audit: improvements in PV

Problema Solution

Supporting structure of the photovoltaic

system

Building a support structure having a height that

can be useful to exploit or used as a smoking area,

or as a possible expansion of the firm

Shortage in some parts of the thermal

insulation of the roof of the building

The photovoltaic system, and its supporting

structure, will ensure thermal stability and the

water tightness of the roof

Aesthetic impact, indoor and outdoor

Use of photovoltaic panels glass-glass so as to

ensure aesthetics and saving on the supporting

structure

E dit C l i


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Energy audit: Conclusions

A number of possibilities have been identified for improved energy

efficiency

A hierarchy of actions to be taken may be developed to optimise

savings and minimise investment. This may start with simple actions

for controlling lighting and air-conditioning, modifying existing

systems (lighting), insulation to certain parts of the buildingenvelope, and finally the construction of PV systems.

The energy audit is therefore a prelude to a project aimed at

obtaining greater energy efficiency and increased energy savings,

which Ganado Advocates have already taken up on their agenda.

I l i


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In conclusion

..If you w ant to

contr ibute to the welfare

of the wor ld you have to

change the way youdesign i t

THANK YOU for your attention

energy efficiency survey of theganado advocates head office

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