16
Moving to Monitoring Based Commissioning (MBCx)
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017
Aalok A. Deshmukh | Schneider Electric India
2
Table of contents
• Introduction: Growing need to focus on buildings
• Conventional methods to maintain building performance
• Moving towards monitoring based commissioning (MBCx)
• State of commissioning in India
• Cost and time implications of MBCx
• Case study: Schneider Electric India Corporate Office
• Conclusion
Introduction: Growing need tofocus on buildings
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 3
Globally, electricity consumption in buildings is expected to grow by 80% in the next 25 years.
In India, 33% of the total electricity consumption goes to buildings and it has been increasing by 8-10% per annum over the past 7-8 years.
82% of energy efficiency potential yet to be tapped in buildings.
Conventional methods to maintain building performance
A method to ensure that the building systems meet their design intent, operate and interact optimally.
Includes building HVAC, controls, lighting, hot water, security, fire, life and safety systems.
Successful Cx results in optimal energy performance, enhanced IEQ, extended system life and reduced O&M costs.
To be most effective, building commissioning should begin in the planning phase and continue throughout a building's life cycle.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 4
Commissioning (Cx)
Conventional methods to maintain building performance
A process that is applied to existing buildings that have never been commissioned, to restore them to optimal performance.
Focus on energy using equipment such as mechanical equipment, lighting and related controls.
Includes an audit of the entire building, and optimization of existing system performance.
Re-testing and re-monitoring of building systems to help find and repair operational problems.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 5
Retro – commissioning (RCx)
Conventional methods to maintain building performance
A process that occurs when a building has already been commissioned undergoes another commissioning process.
Need for recommissioning usually arises because of change in building use or ownership, or if systems have not been examined for many months.
Plan for recommissioning should be established as part of a new building’s original commissioning process or an existing building’s retro-commissioning process.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 6
Re – commissioning
Moving towards MBCx
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 7
Emphasis on continuous performance monitoring and trending for diagnosis of energy waste, for savings accounting, and to enable persistenceof savings.
An approach that can often deepen the scope of commissioning projects, and provide a platform for ongoing efforts to manage building energy use.
MBCx utilizes components like permanent energy information systems (EIS)and diagnostic tools at the whole-building and sub-system level.
These components continuously diagnose facility performance and identifyequipment and system faults, improvements in sequence of operations, and system and energy use trends.
Tools and technologies like a building management system (BMS)integrated along with an energy management system (EMS) can be used for this approach.
Moving towards MBCx – Different stages
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 8
Continuous Monitoring
EvaluationImplementation
Moving towards MBCx – Different stages
• Requirement: meters and sensors integrated with an EMS.
• Outcome: Real or near-real-time data gathering with status report generation.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 9
Continuous Monitoring
• Requirement: Extensive knowledge and a deep understanding of the whole facility and its operations.
• Outcome: Modelling and analytics, energy benchmarking, and energy data review reports with EEMs identified.
Evaluation
• Requirement: A well co-ordinated team of facility managers, engineers and operators.
• Outcome: EEM implementation with a priority report for EEMs along with a schedule for implementation.
Implementation
Moving towards MBCx – How is MBCx different?AdditionalEnergySavingsFromMBCx
Persistence of savings from RCx due to early identification of deficiencies through metering and trending.
RCx savings can degrade without an explicit effort to continuously monitor and maintain them.
By utilizing a combination of an EMS and BMS, MBCx can identify new problems that emerge after the conventional commissioning processes.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 10
State of commissioning in India
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 11
Practice of commissioning is extremely rare in India, driven mainly by the requirements of green building rating systems.
Carried out with rigour only in mission-critical installations and applications such as banking, data centres, etc.
MBCx is currently not being practicedin India, although if adopted, as a part of the SOP by the facility or maintenance staff, one can achieve desired levels of performance and assurance in O&M practices.
Cost and time implications of MBCx
• Globally, on an average, building systems commissioning usually costs between 0.5% to 1.5% of the hard construction costs of a project.
• For effective MBCx, for a commercial office of 2,000 sq. m. with annual energy consumption of 500,000 kWh, one would need:
• A metering and monitoring infrastructure in place for at least the significant energy end uses (e.g., HVAC, lighting, UPS, raw power).
• 12-15 energy meters, a BMS with an EMS (either separately or combined), a lux meter and 4-6 temperature sensors.
• The total cost for this installation would be in the range of INR 1 – 1.5 million.
• The time required for carrying out continuous monitoring in this case would be 1-2 person-days per month.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 12
Case study: SEI corporate office
• Facility Snapshot – SEI Corporate office at Gurgaon, India: An ISO 50001 certified facility.
• Three different scenarios are discussed here to illustrate the benefit of MBCx:
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 13
Scenario A
Business as usual case:
• No monitoring
Scenario B
Present situation:• Combination of
continuous and periodic monitoring and periodic corrective actions.
Scenario C
The ideal situation:• Continuous
monitoring and better controls with near-real-time corrective actions
Case study: SEI corporate office –The current situation
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 14
• A permanent energy metering and monitoring infrastructure is installed to carry out an energy review at defined intervals.
• Following are a few examples of how a semi – automated approach of MBCx has worked at the office:
Measure Description ResultUPS system optimization • UPS efficiency increase -
from 87% to 92%• Annual energy savings of
~11,500 kWh• Cost savings of INR 306,000
(kWh + O&M)
Server room cooling set point optimization
• Set point optimized from 20oC to 24oC
• Annual energy savings of 4,500 kWh
• Cost savings of INR 61,000
Reducing lighting energy consumption due to over -
illumination
• Illumination levels were higher than required at many spaces.
• Lighting fixtures turned off or removed permanently.
• Annual energy savings of 40,000 kWh.
• Cost savings of INR 540,000
Case study: SEI corporate office –Scenario comparisons
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 15
Scenario -> A B C
Method & Approach
No ongoing monitoring or performance
tracking
Continuous energy use and
temperature monitoring,
monthly lux-level monitoring
Better controls and corrective actions with alarms and
indicators
Estimated Annual Energy Use
600,000 kWh(Modeled)
538,000 kWh (as of 2016)
500,000 kWh (Estimated)
Impact
11% increase in energy use in the
absence of monitoring
Further 7%reduction in energy use as compared to
the current situation
ConclusionMBCx can be very useful for an effective energy
management.It can help in identifying a wide range of deficiencies and
faults in systems and operations.Energy savings are expected to be more persistent from
MBCx, rather than from conventionally commissioned facilities.As evident from the case study, the approach of MBCx and a
focus on continuous improvement through ongoing monitoring can result in a significant reduction in energy use and cost.
12/7/2017 International Symposium to Promote Innovation & Research in Energy Efficiency 2017 16
