SMART CITY
Rethinking Energy Efficiency
(EE) in Commercial Building
Collaboration between:
&
Date:
17 September 2014
Presented by: Ir. Mohamad Adan bin Yusof
Commercial Buildings in Malaysia
Average Building Energy Index (BEI) for commercial buildings (Malaysia):‐
Typical Office Buildings
: 200 to 250 kwh/m2/year
Typical Shopping Mall
: 450 kwh/m2/year
Recommended BEI(MS1525) :135 kwh/m2/year
Copyright MIGHT‐PTHM ‐MGE‐2014
2
What we have achieved
Energy Commission Diamond Building:
Designed BEI : 85 kwh/m2/year
Current BEI : 65 kwh/m2/year
Note: EE implementation from design stage
Copyright MIGHT‐PTHM ‐MGE‐2014
3
Commercial Buildings in Malaysia
What do we do with the existing Average Building Energy Index (BEI) for commercial buildings:‐
inefficient Typical Office Buildings
: 200 to 250 kwh/m2/year
buildings?
Typical Shopping Mall
: 450 kwh/m2/year
Recommended BEI(MS1525) :135 kwh/m2/year
Copyright MIGHT‐PTHM ‐MGE‐2014
4
Common EE Approach (Active System)
Replacement & Retrofitting
Improve:
Lighting
Chiller
AHU
Cooling Tower
Pump
etc
Copyright MIGHT‐PTHM ‐MGE‐2014
5
Common EE Approach (Active System)
Replacement & Retrofiting
Overall Energy Saving:
15‐20%
Copyright MIGHT‐PTHM ‐MGE‐2014
Improve:
Lighting
Chiller
AHU
Cooling Tower
Pump
etc
6
Common EE Approach (Active System)
Replacement & Retrofiting
Improve:
Overall Energy Saving:
15‐20%
Little saving with high installation & replacement cost (not attractive)
Copyright MIGHT‐PTHM ‐MGE‐2014
Lighting
Chiller
AHU
Cooling Tower
Pump
etc
7
What We Overlook (Passive System)
Passive System: Building Envelope & Retro Commisioning
Building Simulation and
Analysis
Building Envelope &
Retro Commissioning
(Building Optimization)
Copyright MIGHT‐PTHM ‐MGE‐2014
8
What We Overlook (Passive System)
Passive System: Building Envelope & Retro Commisioning
Potential Increase in Overall Energy Saving:
20‐30%
Building Simulation and
Analysis
Building Envelope &
Retro Commissioning
(Building Optimization)
Copyright MIGHT‐PTHM ‐MGE‐2014
9
What We Overlook (Passive System)
Passive System: Building Envelope & Retro Commisioning
Potential Increase in Overall Energy Saving:
20‐30%
Building Simulation and
Analysis
Building Envelope &
Retro Commissioning
Lower Implementation cost
(Building Optimization)
Copyright MIGHT‐PTHM ‐MGE‐2014
10
The Key (Focus Area)
3%
Focus area:
Significant effect
19%
58%
20%
Typical energy consumption breakdown of mid‐rise office building in Malaysia
Copyright MIGHT‐PTHM ‐MGE‐2014
11
Back to Basic
Copyright MIGHT‐PTHM ‐MGE‐2014
12
Building Envelope Solar Heat Gain Reduction
•
UV Rejection – 99 %
•
IR Rejection – 97 %
•
Vt – 78 %
•
SHGC – 0.17
•
CGI ‐ < 7
•
U‐Value – 1.62
Copyright MIGHT‐PTHM ‐MGE‐2014
Daylight Harvesting
•
Up to 2,500 Lux
•
Up to 12 meters
•
Variance < 5 %
•
Exterior View
No More Window Blinds !
13
Building Envelope Glare Rejection & Daylight Harvesting
Istana Negara: building envelope enhanced the daylight into a space without glare and heat Copyright MIGHT‐PTHM ‐MGE‐2014
14
Building Envelope (Summary) Technical Capacity
Solar Heat Rejection (up to 86 %)
Daylight Harvesting
Glare
Rejection
Copyright MIGHT‐PTHM ‐MGE‐2014
Benefit
‐ Cooling Load Reduced Significantly
‐ Reduced Lighting Requirement
‐ Occupancy Comfort Improvement
‐ Occupancy Comfort Improvement
15
Passive System Methodology
Building Simulation and
Analysis (Sun Study)
Building Envelope Installation
Retro Commissioning
(Building
Optimization)
Copyright MIGHT‐PTHM ‐MGE‐2014
‐ HVAC reconfiguration to new cooling load requirement
‐ Lighting readjustment to new lighting level requirement
16
Sample Case Study (KLCC)
Temp Celcius
Before
After
Avg of 5.30 °C
reduction during office hour
Time
Office room temperature before and after building envelope installation
Copyright MIGHT‐PTHM ‐MGE‐2014
17
Sample Case Study (KLCC)
Lux level
Before
After
Avg of 280 Lux increment during office hour
Time
Internal lighting level (Lux level) before and after building envelope installation
Copyright MIGHT‐PTHM ‐MGE‐2014
18
Financing EE Project
Energy Perfomance Contracting (EPC) Model
EPC Agreement
Owner (Host)
ESCO/Investor
Payment
(through savings)
Copyright MIGHT‐PTHM ‐MGE‐2014
19
Financing EE Project
Shared Saving Concept
Copyright MIGHT‐PTHM ‐MGE‐2014
20
Sample Project (Passive System)
Menara Mara Estimated Annual Saving
: RM 755,000 (19% Energy Cost Reduction)
Estimated Implementation Cost
: RM 2,360,000
Simple Payback Period
: 3.12 years
EPC Model Payback Period
: 5 ‐7 years (depending on contract) Copyright MIGHT‐PTHM ‐MGE‐2014
21
Conclusion
Potential Saving on commercial building:
Approach
Potential Saving
Cost
Active
15‐20 %
Higher
Passive
15‐20 %
Lower
Active + Passive
20‐30%
Copyright MIGHT‐PTHM ‐MGE‐2014
22
Thank You
Rethinking Energy Efficiency
(EE) in Commercial Building
Collaboration between:
&
Date:
17 September 2014
Copyright MIGHT‐PTHM ‐MGE‐2014
23

Download Attachment