dc.contributor.advisor |
Rajapaksha I |
|
dc.contributor.advisor |
Rajapaksha U |
|
dc.contributor.author |
Jayasinghe WS |
|
dc.date.accessioned |
2020 |
|
dc.date.available |
2020 |
|
dc.date.issued |
2020 |
|
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/16899 |
|
dc.description.abstract |
In the last few years, together with the surge in new construction, the energy demand from
buildings has also been influenced by current practice on energy demanding mechanically
controlled buildings with artificially lit interiors. Present urban development strategy of
implementing Mega polis development plan for city of Colombo expands its boundaries of
the urban building stock. Thus, it’s vital to explore the end use energy demand of national
building stock and comprehend a relationship between building morphology and energy
consumption. A walkthrough field investigation was performed in 46 Wards in Colombo
Municipal Council region. The structure of the survey was organized in relation to
geographical information system (GIS) data and land use maps of the CMC region. Data was
collated to formulate a comprehensive database on morphology of office building stock
comprising major physical parameters and energy indices. Results revealed the office
building stock is primarily composed of Air-conditioned office spaces and of which 78%
contains naturally ventilated common spaces. In this stock 53% and 13% of the office
buildings have an annual average building energy index above 200KWhm¯² and
300KWhm¯² respectively. Linear shape dominates the plan form representing 70.2% of the
stock. Other basic shapes such as square, circular and composites corresponds to 19.5%,
2.3% and 8% respectively.
. 54.55% of the office buildings have an average BEI of 150-250 kWhm-². Out of which
37.03% of the office buildings are EW oriented. Nexus between building façade
configuration and building energy index were further analyzed using multiple and simple
linear regression analysis. The analysis was conducted for buildings in the identified energy
index categories by considering all four orientations. EW and NS oriented buildings were
considered for further investigation to evaluate the effect of aspect ratio on energy index. It
is evident that aspect ratio of 0.70 (1:1.43) in 100-150 kWh-² energy index range was within
the optimal range. The optimal aspect ratio for buildings along east west axis is within the
range of 1.27:1 to 1.5:1. Further increase of aspect ratio beyond this range result in increase
of energy consumption in buildings. The average aspect ratio for NS oriented buildings in
100-150 kWh-² energy index range was 1.49 (1.49:1), which was within the optimal range.
Nonetheless, the average aspect ratio for NS oriented buildings in Average Range is 3.22
(3.22:1), which is beyond the optimal range.
Further onsite thermal investigations in the selected representative buildings with deep and
shallow plan forms revealed a clear indoor temperature difference during air conditioned and
non-air-conditioned period. It is evident that deep plan form has a greater potential to control
external heat gain and reduce end use energy demand. In contrary, shallow plan forms are
more susceptible for external heat gain and higher temperature variation is evident periphery
and core. Moreover, overheating building periphery in both shallow and deep plan forms are
susceptible for overheating condition. Thus the findings of this study represent the criticality
of building morphology based on plan shape, orientation and interior planning which
demonstrate a significant impact on end use energy demand due to external heat loads. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
ARCHITECTURE - Dissertations |
en_US |
dc.subject |
MORPHOLOGY |
en_US |
dc.subject |
BUILDING STOCK - Sri Lanka - Colombo |
en_US |
dc.subject |
URBAN OFFICES |
en_US |
dc.subject |
BUILDING ENERGY INTENSITY |
en_US |
dc.title |
Appraising a relationship between morphology and energy index of office buildings in tropics: |
en_US |
dc.title.alternative |
a case of urban building stock in Colombo municipal council |
en_US |
dc.type |
Thesis-Full-text |
en_US |
dc.identifier.faculty |
Architecture |
en_US |
dc.identifier.degree |
Master of Philosophy |
en_US |
dc.identifier.department |
Department of Architecture |
en_US |
dc.date.accept |
2020 |
|
dc.identifier.accno |
TH4447 |
en_US |