rebuilding the world trade center
DESCRIPTION
Presented at the June 2009 IDEA Conference - Rebuilding the World Trade Center Central Chiller PlantTRANSCRIPT
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Rebuilding ofthe District Cooling
Plantat the
World Trade Center
Hemant Mehta, P.E. and Christopher Tso, P.E.
WM Group Engineers, P.C. CRC Engineering, P.C.
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Executive Summary
Project highlights and challenges:• 12,500 ton central chiller plant, river water systems and
site chilled water distribution system design• Provides ten (10) stakeholders with CHW for cooling• Uses river water from the Hudson River for condensing• Rehabilitation of the existing river water pump station• Compliance with environmental permit (SPDES) for
river water use• Salt water (river water) systems design• Chiller plant energy modeling and configuration study• Site chilled water distribution system design passing
through other stakeholder areas• Extensive coordination with other projects onsite at
varying stages of design / construction
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Project Highlights
• 12,500 ton chiller plant and distribution system– Five 2500 ton electric centrifugal chillers– Five 300 hp chilled water pumps with VFDs– Two 1000 ton free/pre-cooling plate & frame heat
exchangers (chilled water / river water)
• River water pump station rehabilitation– Environmental permit requirements– Four 500 hp vertical turbine river water pumps with
VFDs– Replacement/rehabilitation of traveling screens and
sluice gates
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Stakeholders Served
• National September 11 Memorial & Museum• Freedom Tower retail• Transportation Hub• Performing Arts Center• East Bathtub retail• Vehicle Security Center• Master Manager• MTA Cortland Street
‘1-train’ Subway Station• North Access• South Projection
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Project Challenges
• Rigging of equipment• Coordination with many other projects onsite
at varying stages of design/construction– Central chiller plant is located below grade inside
the National September 11 Memorial & Museum– Site chilled water distribution passes through other
stakeholder spaces– Phased stakeholder loads– Construction staging/logistics– Site wide systems integration
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
World Trade Center Site
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
World Trade Center Site
Chiller Plant Below Memorial Plaza
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Chiller Plant Configuration Study
• Detailed energy and operating cost modeling– Hourly weather data– Hourly river water temperature data– Equipment part-load performance– VFDs vs constant speed drives for the chillers– Free cooling operation– Utility rate schedule
• Procurement considerations– Multiple bidders required
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Cooling Load Profile
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
River Water Temperature
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Free Cooling Operation
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
River Water Systems Design
• Condition survey– River water pump station equipment– River water pump station diver inspection– River water pump station ductbank condition
survey– Interior piping inspection of 60 and 66 inch
underground river water mains• Environmental permit requirements (SPDES)– VFDs for river water pumps– Metering/logging of flows and temperatures
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
River Water Pump Station
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Existing River Water Piping Inspection
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
River Water Systems Design
• Salt water system design– Materials and coatings– Cathodic protection
• Dual headered piping system for seasonal interior river water piping inspection
• Replacement/refurbishment of traveling screens and sluice gates
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Interior River Water Piping Inspection
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Stakeholder Chilled Water Interface
• Interface at each stakeholder mechanical room– Flow meter, temperature & pressure transmitters– Monitoring of interface at chiller plant
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Phased Stakeholder Loads
• Phased loads– Memorial: September 2011 (partial opening)– Freedom Tower: October 2011– Transportation Hub: November 2012– East Bathtub Retail: November 2012
• Two chillers with hot gas bypass to serve the Memorial partial opening
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Construction Logistics
• Chiller plant is below grade inside the Memorial– The Memorial plaza at grade must be completed for
partial opening (September 2011)– Plant access through equipment rigging hatch and
shared freight elevator– Site access from Route 9A
• River water pump station– Located below grade, under a pedestrian plaza– Equipment access via hatches in plaza– Pedestrian plaza owned by Battery Park City
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Construction Logistics
• Coordination with other projects onsite– National September 11 Memorial & Museum– Freedom Tower– Vehicle Security Center– West Vent Structure– South Projection– Route 9A Relocation
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Construction Logistics
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Construction Logistics
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Site Wide Systems Integration
• Fire Alarm• Radio systems• Telecommunications• BMS
IDEA Centennial Conference: “Local Energy, Global Solution” June 28–July 1, 2009
Contact Information
Hemant Mehta, P.E.PresidentWM Group Engineers, P.C.370 Seventh Avenue, Suite 701New York, NY 10001(646) [email protected]://www.wmgroupeng.com
Christopher Tso, P.E.PresidentCRC Engineering, P.C.1261 Broadway, Suite 608New York, NY 10001(212) [email protected]://www.crc-eng.com