3. 3
•The roof is the most important component of any building
that significantly affects the quality of the indoor thermal
comfort as it contributes about 50-70% in heating and cooling
load of a building.
•This load can be reduced by insulating roof through various
materials and techniques to control indoor temperature at
comfortable level during summer and winter.
•In both cases roof is required to act as an effective barrier for
heat flow from external to internal and internal to external
environment.
INTRODUCTION
Importance of Roof in Building
4. 4
INTRODUCTION (CONT….)
•The use of burnt clay pots on roof with mud and finishing
covering has been widely used in Asian countries such as
Bangladesh, India and Sirilanka. The indoor thermal
condition can be improved by increasing the volume of air
pockets.
Burnt Clay Pots Roof for Thermal Insulation of
Roof
5. 5
OBJECTIVE (CONT….)
PROBLEM
•Households Buildings in Pakistan pay high bills for
electricity in summer due to the excessive use of fans,
evaporative coolers and air conditioners. Similarly, winter
bills for gas are extortionate mainly due to its use for space
heating.
•Mostly, the traditional passive cooling techniques of roof
are not applied in modern buildings that causes more heat
flow into the building.
14. 14
Factors affects in the Selection of pots.
Selection of Burnt Clay Pots
1. Shape of pots
2. Diameter
3. Height
4. Gaps b/w Pots
EXPERIMENT
15. 15
EXPERIMENT (CONT….)
Problem facing from the market’s available pots
Selection of Burnt Clay Pots Cont…
• Size and shape of the pots that are available in the
market are mostly used for the plantation and other
household uses.
• Secondly, the various heights of the same diameter of
pots are not available in the market.
• Circular shape Pots are not availablein the market.
Patent Pots
31. 31
RESULTS AND DISCUSSION
0
5
10
15
20
25 12:00:00
AM
1:00:00
AM
2:00:00
AM
3:00:00
AM
4:00:00
AM
5:00:00
AM
6:00:00
AM
7:00:00
AM
8:00:00
AM
9:00:00
AM
10:00:00
AM
11:00:00
AM
12:00:00
PM
1:00:00
PM
2:00:00
PM
3:00:00
PM
4:00:00
PM
5:00:00
PM
6:00:00
PM
7:00:00
PM
8:00:00
PM
9:00:00
PM
10:00:00
PM
11:00:00
PM
12:00:00
AM
1:00:00
AM
Temperature
°C
Time (Hours)
Jan-2018
Ambient Temperature 8" Pots Temp. 6" Pots Temp.
39. 39
RESULTS ANALYSIS
Ecotect Energy analysis
•According to Microsoft Autodesk “Ecotect is sustainable
design analysis software is a comprehensive concept-to-detail
sustainable building design tool. Ecotect Analysis offers a
wide range of simulation and building energy analysis
functionality that can improve performance of existing
buildings and new building designs.” by Microsoft Autodesk.
45. 45
RESULTS ANALYSIS
Ecotect Energy analysis
•The indoor room temperature of the building is first
measured in the field. The field measurements were then
compared to the simulated temperature obtained by Ecotect
than the results of 6inch and 8inch pots are same.
•The validation results showed that Ecotect™ underestimated
thermal loads in the analysed cases. Therefore, these findings
show that Ecotect™ cannot be used for accurate simulations
of thermal loads and energy.[9]
47. 47
RESULTS ANALYSIS
Revit & GBS Energy Analysis
•The energy analysis can be run on Green Building Studio in
the cloud and provide analysis results directly within the tool.
Room/Space Elements: In Revit, a full building model can be
used to create an Energy Analytical Model.
60. ROOF INSULATION ON REVIT MODEL
Cases Description
Top Roof Details Walls Details
Thick
ness
U-Value
Thick
ness
U-Value
In Btu/(h.ft3.F) in Btu/(h.ft3.F)
U Untreated Roof 7.5 0.7503 10 0.3722
6R 6" burnt pots Top roof 14 0.0817 10 0.3722
8R 8" burnt pots Top roof
17 0.0602 10 0.3722
8R2W
8" burnt pots Top Roof and 2
inch air Insulation in wall
17 0.0602 13 0.0692
8R3W
Top roof 8" burned pots and 3
inch air Insulation in wall
17 0.0602 14 0.0495
8R4W
Top roof 8" burned pots and 4
inch air Insulation in wall
17 0.0602 15 0.0385
66. 66
Description
Surface
area of
Roof
(sft)
Surface
area of
Exterio
r Roof
(sft)
Untreaed
Roof and
wall R.s
49/sft
Top roof
6" burned
pots roof
only R.s
83/sft
Top roof
8" burned
pots roof
only R.s
83/sft
Top roof 8"
burned
pots roof
and 2 inch
air
Insulation
Rs. 40/sqft
Top roof
8" burned
pots roof
and 3 inch
air
Insulation
Rs. 40/sqft
Top roof
8" burned
pots roof
and 4 inch
air
Insulation
Rs. 40/sqft
Expense on Roof Insulation
3038.7 6624
148,897 252,213 252,213 252,213 252,213 252,213
Expense on Wall insulation - - - 264,960 264,960 264,960
Total Cost 148,897 252,213 252,213 517,173 517,173 517,173
Additional Cost of Insulation 103,316 103,316 368,276 368,276 368,276
Saving of Heating and Cooling /yr 90,549 93,779 127,733 132,053 133,944
Pay Back Period 1.14 1.10 2.88 2.79 2.75
PAY BACK PERIOD AND COSTANALYSIS
67. 67
•The more insulation in a building exterior envelope, the less
heat transferred into or out of the building due to
temperature difference between the interior and exterior.
•The 8 inch IBCP treated roof remain around 8% (1.25 ºC
(average) temperature & (1.75 ºC in peak hrs) more efficient
than 6inch pots treated roof.
•Increasing the volume of air pockets in the roof insulation
gives better results in winter and summer season.
CONCLUSIONS:
68. CONCLUSIONS
• The average annual reduction in heating and cooling
loads are 29%, 31%, 41%, 42% and 43% and 44% by
insulating with 6R, 8R, 8R2W, 8R3W & 8R4W
insulations respectively.
• Average this house is saving Rs. 133,944 anually
• Comparison of cost of insulated and untreated houses
concluded that the average payback period are 1.14, 1.10,
2.88, 2.79 and 2.75 years by insulating with 6R, 8R,
8R2W, 8R3W & 8R4W insulations respectively.
69. 69
• Dr. Umamah eshwaran Rajasekar, Pankaj Khanna and
Vishal Mehta, (April 2015) “Handbook on Achieving
Thermal Comfort within Built Environment Volume II”
Asian Cities Climate Change Resilience Network
(ACCCRN), pp .15-19.
• Bijon Sarma, (2013) “Burnt-Pot Roof Insulation” (BPRI):
Its Application and Efficiency in Bangladesh”.
• Meghana Charde and Rajiv Gupta, (Dec. 2013), “Annual
Thermal Performance of a Hollow Roof in Combination
with a Cavity Wall and Static Sunshade: Experimental
Study of Energy-Efficient Rooms.” J. Energy Eng., 2013,
139(4): 281-289.
• Irshad Ahmad, (2010), “Performance of antisolar
insulated roof system.” Renewable Energy 35 (2010) 36–
41.
REFERENCES:
70. • C.V. Subramanian, N. Ramachandran and S.
Senthamil Kumar, (2017), “A Review of Passive Cooling
Architectural Design Interventions for Thermal Comfort
In Residential.” Indian J.Sci.Res. 14 (1): 163-172, 2017.
• Mohammad Arif Kamal, (September 2012), “An
Overview of Passive Cooling Techniques in Buildings:
Design Concepts and Architectural Interventions.” Acta
Technica Napocensis: Civil Engineering & Architecture
Vol. 55, No. 1 (2012).
• Neha Gupta & Gopal N. Tiwari, (August 2016),
“Review of passive heating/cooling systems of buildings”
Energy Science and Engineering2016; 4(5): 305–333.
70
REFERENCES:
71. Arif S. (2011). Energy Efficient House Design, Effect of
Orientation on indoor temperature profile, doctorate
Thesis, University of Engineering and Technology,
Lahore,Pakistan.
I. Hernández-Pérez, G. Álvarez, J. Xamán, I. Zavala-Guillén, J.
Arce and E. Sim, (May 2014), “Thermal performance of
reflective materials applied to exterior building components—
A review.” Energy and Buildings 80 (2014) 81–10.
SimulationsPrasanthi R. Vangimalla ; Svetlana J. Olbina ;
Raymond R. Issa ; Jimmie Hinze , (Dec. 2011). Validation of
Autodesk Ecotect™ accuracy for thermal and day lighting
IEEE11-14 Dec. 2011
71
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