Prof.bassam Amin

8/12/2019 Prof.bassam Amin

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Energy Performance of a Residential Villa

in Dubai Designed in Accordance withthe Abu Dhabi PEARL Villa Rating System

G.S. Amin & B. Abu-Hi leh

Energy Performance of a Residential

Villa in Dubai Designed in

Accordance with the Abu Dhabi

PEARL Villa Rating SystemG.S. Amin & B. Abu-Hijleh

The British University in Dubai

Dubai - United Arab Emirates


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What is the Problem?

Increased CO2concentration resulting in

global warming and other environmental

issues

Increasing energy demand from mainly

dwindling fossil fuel reserves


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Why Buildings?

-Buildings are the major users of energy (40-50% of primary energy)

-Buildings result in approximately 40% of CO2 emissions


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In the USA;

-HVAC 31.4%

-Lighting 14.1%

-Water heating 8.6%

- i.e. top three uses account for

more than half the energy consumed

in buildings

In Dubai;

-HVAC account for 40% of the

annual electricity production

- and 60% of the peak demandduring summer

How is Energy Used in Buildings?


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What is a Green Building?

Many definitions.According to the US Environmental Protection Agency (EPA); Green

building is the practice of creating structures and using processes that

are environmentally responsible and resource-efficient throughout a

building's life-cycle from siting to design, construction, operation,

maintenance, renovation and deconstruction. This practice expands andcomplements the classical building design concerns of economy, utility,

durability, and comfort. Green building is also known as a sustainable or

high performance building.


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Green Buildings (benefits)

Benefits include:

Reduced environmental footprint

Lower operating costs (energy & maintenance)

Improved IEQ and thus health & productivity

Higher market value

etc


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Large number (mainly modeled after LEED) LEED seems the most widespread

Other well know systems include BREEAM and Green Star

Becoming more specialized, e.g. LEED C&S, Interiors, Schools

etc.

All based on the triple bottom line: Environmental, Economical,Social

All are point based systems with compulsory aspects

(prerequisites) and additional aspects that would earn points

toward achieving one of several certification levels.

Green Building Assessment Systems


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ESTIDAMA (Sustainability in Arabic)

UAE is ranked 1st/2ndhighest Carbon footprint in the

world

ESTIDAMA Green building assessment system for Abu-Dhabi-UAE was introduced in 2010

Modeled after LEED

Major differences:

Mandatory (one pearl level, can go upto 5 pearls)

Adds a fourth concept (Cultural) Spans Design , construction andpost -occupancy

Higher emphasis on water (23% vs. 5% for LEED

and 2.5% for BREEAM)

Water at same level as Energy (23% vs. 33% for

both LEED and BREEAM)

Three categories: Community, Building and Villa


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Study Motivation:

Assess the improvement in building performance should theEstidama guidelines be applied in Dubai instead of the current

regulations.


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Methodology

A newly built villa in Dubai is used as a case study to evaluate

different build configurations in accordance with Dubai and Estidamarequirements, the villa is built to a higher standard than that of DM.

The focus will be on the requirements of the building envelop only

(walls, roof and glazing).

Computer simulation (Ecotect from Autodesk) is used to perform the

energy analysis for the different configurations.


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Configurations studiedWall U-value

(W/mCo)

Roof U-value

(W/mCo)

Glazing U-value

(W/m2Co) & SHGC

Window/Wallarea ratio (%)

Reference (current)configuration*

0.38 0.25 Low-e doubleglazing (2.41&0.66)

15%

Minimum 1-PEARLrequirements

0.32 0.14 2.2 & 0.4 15%

2-PEARLRequirements

0.29 0.12 1.9 & 0.3 9.9%

Other glazingconfigurations

-- -- -Single glaze(5.8&0.81)-Low-e triple glaze(1.48&0.22)-Low-e doubleglazing withexternal shading

10%23%

Optimal configuration 0.29 0.12 -Low-e triple glaze(1.48&0.22) withexternal shading

9.9%

*DM standard requires Uwall 0.57 & Uroof0.44 (W/m Co). Uglass3.28 (W/m

2Co)


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Glazing


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Window/Wall ratio*

* Impact of w/w ratio on artificial light use and associated energy consumption is not included


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Conclusions

Even at the 1 Pearl level, Estidama s Pearl system offer improved thermal

performance compared to the current Dubai regulations (10% reduction in energy

consumption in the case studied).

When designing for 2 Pearls, an energy reduction of 26% compared to the reference

case was achieved (16% more than 1 Pearl).

The optimal configuration resulted in an energy reduction of 37% compared to the

reference case.

Given the extra costs associated with the triple-glazing of the optimal configuration, 2

Pearls seems to offer the best compromise in terms of costs and resulting reduction in

energy consumption.

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Prof.bassam Amin