K Y Yow Dir, Technical Center of Excellence Trane, Ingersoll Rand Latest Trends in Chiller System Technologies IGBC Conference 2016 Grand Hyatt ,Mumbai 06-08 Oct 2016 Agenda Chiller vs Chiller Plant ASHRAE GreenGuide - Performance Goals of Chiller Plant Distribution Efficiency – Low Resistance and Low Flow/Rt Design For Low Pump Head Variable Primary Flow Singapore case Studies ( GreenMark Platinum Plants) Recommended Key Technologies ( Product & System)
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K Y YowDir, Technical Center of ExcellenceTrane, Ingersoll Rand
Latest Trends in Chiller System Technologies
IGBC Conference 2016Grand Hyatt ,Mumbai 06-08 Oct 2016
Agenda
� Chiller vs Chiller Plant
� ASHRAE GreenGuide - Performance Goals of Chiller Pl ant
� Distribution Efficiency – Low Resistance and Low Flo w/Rt
� Design For Low Pump Head
� Variable Primary Flow
� Singapore case Studies ( GreenMark Platinum Plants)
At Constant Flow, STD 3.0 GPM/RT Design can hit >0.1 Kw/Rt at 50-60% load
GPM/RT increases during chiller Partload => Higher Kw/Rt
KWI Savings Expands at Part Load
Design for LOW Pressure Resistance CHW/CW SystemGoal : Max 15 - 20m ( CHW)
Max 10 -12m ( CW)
� Low WPD Chiller Evap/Cond ( <4m)
� Avoid 90 Deg Bends in Piping� Over Size Riser Pipe where
justified� Avoid use of Balancing Valve� Locate CT near plantroom� Elevate Pumps to same elevation
as chiller connection
� Replace 4 X 650Rt with 3 X 700 RT� Relocate Chiller plant to Carpark� Locate new CTs next to plant� Re-design with VPF (existing Pri-Sec)� Remove Balancing Valves
Green Energy Management (GEM) Project by Grand Hyatt Spore (1999)
1.0 Kw/Rt to 0.59 Kw/Rt
Case Study 1 : Hotel
A/C A/C
BAS
Airside
Existing Air-cooled Chiller plant >1.3 Kw/RT
Case Study 2 : Existing Office Building
Operating0.56 Kw/rt
Retrofit : ( 2 x 500 RT ) 0.514 Kw/RT
Ancillary Kw/Rt = 0.041 ( 8% of System)
8C CHW(select at6.7C)
Case Study 3 : Existing Commercial Bldg
3.5 Million Sq Ft Business Park Development ( 7,000 RT)
Sustaining 0.58 Kw/RT since completion in 2010 ( 6Y operation)
Case Study 4 : Existing Business Park Performance Audit after 6 Yrs
Meeting the GreenGuide Goals of 0.55 Kw/Rt Plant ?
6.2 C , Tropics Temperate Climate
0.503
0.015
0.024
0.005
Site
0.547
Case Study : A Singapore Site ( 3600 RT at 6,2C)
Singapore Project achieving 0.55 Kw/Rt ( Average 0 .57 )
M+V Captures and Display All Essential Data for Analytics
Ministry of the Environment and Water Resources, Si ngapore
Energy saving system design
Improvement 35%(0.86 to 0.57 Kw/Rt)
Scope: • 1 x 850RT Low-pressure Centrifugal Chillers (0.48 Kw/Rt) replacing existing 2 X 500 RT R134a chiller( 8 yrs Old)• New chilled water and condenser water pumps c/w VSD• System efficiency of <0.60kW/RT
GreenMark Platinum
Case Study 5 : Govt Building
2012 Energy Retrofit ( Guaranteed Energy Savings Performance)
Energy Retrofit is more than one-to-one chiller Cha nge-out
Re-configure Pumping ( Pri-Sec to VPF)Re-Engineer Piping layout to Minimise Friction Loss
STRAIGHT CW PIPE CONNECTION TO CHILLER
CWS PIPE NOZZLE
Many pipe bends and turns – high frictional loss CHW/CW water
distribution system
Balancing valve - high
∆∆∆∆P
BEFORE AFTER
Components Recommended Performance
System Optimisation( New/Existing Plants)
Chillers 0.48-0.52 Kw/Rt (rated at AHRI conditions)Low Water pressure Drop (<3m)
Optimise ( Not one-to-one changeout)Large DT ( CHW 7-11C)/ (CW 7-10C) Convert to Variable Primary FlowCHW Temp: 5 to 7.5C Can consider Reset (Operation).
Pumps/Motors Min 85% (P) /93%(M) Eff CHW/CW Kw/Rt < 0.03CHW Head <20mCW Head <15m