Rebuilding the World Trade Center


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Presented at the June 2009 IDEA Conference - Rebuilding the World Trade Center Central Chiller Plant

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Rebuilding the World Trade Center

  1. 1. Rebuilding ofthe District Cooling Plantat theWorld Trade Center<br /> Hemant Mehta, P.E. and Christopher Tso, P.E.<br /> WM Group Engineers, P.C. CRC Engineering, P.C.<br />
  2. 2. Executive Summary<br />Project highlights and challenges:<br />12,500 ton central chiller plant, river water systems and site chilled water distribution system design<br />Provides ten (10) stakeholders with CHW for cooling<br />Uses river water from the Hudson River for condensing<br />Rehabilitation of the existing river water pump station<br />Compliance with environmental permit (SPDES) for river water use<br />Salt water (river water) systems design<br />Chiller plant energy modeling and configuration study<br />Site chilled water distribution system design passing through other stakeholder areas<br />Extensive coordination with other projects onsite at varying stages of design / construction<br />
  3. 3. Project Highlights<br />12,500 ton chiller plant and distribution system<br />Five 2500 ton electric centrifugal chillers<br />Five 300 hp chilled water pumps with VFDs<br />Two 1000 ton free/pre-cooling plate & frame heat exchangers (chilled water / river water)<br />River water pump station rehabilitation<br />Environmental permit requirements<br />Four 500 hp vertical turbine river water pumps with VFDs<br />Replacement/rehabilitation of traveling screens and sluice gates<br />
  4. 4. Stakeholders Served<br />National September 11 Memorial & Museum<br />Freedom Tower retail<br />Transportation Hub<br />Performing Arts Center<br />East Bathtub retail<br />Vehicle Security Center<br />Master Manager<br />MTA Cortland Street<br /> ‘1-train’ Subway Station<br />North Access<br />South Projection<br />
  5. 5. Project Challenges<br />Rigging of equipment<br />Coordination with many other projects onsite at varying stages of design/construction<br />Central chiller plant is located below grade inside the National September 11 Memorial & Museum<br />Site chilled water distribution passes through other stakeholder spaces<br />Phased stakeholder loads<br />Construction staging/logistics<br />Site wide systems integration<br />
  6. 6. World Trade Center Site<br />
  7. 7. World Trade Center Site<br />Chiller Plant Below Memorial Plaza<br />
  8. 8. Chiller Plant Configuration Study<br />Detailed energy and operating cost modeling<br />Hourly weather data<br />Hourly river water temperature data<br />Equipment part-load performance<br />VFDs vs constant speed drives for the chillers<br />Free cooling operation<br />Utility rate schedule<br />Procurement considerations<br />Multiple bidders required<br />
  9. 9. Cooling Load Profile<br />
  10. 10. River Water Temperature<br />
  11. 11. Free Cooling Operation<br />
  12. 12. River Water Systems Design<br />Condition survey<br />River water pump station equipment<br />River water pump station diver inspection<br />River water pump station ductbank condition survey<br />Interior piping inspection of 60 and 66 inch underground river water mains<br />Environmental permit requirements (SPDES)<br />VFDs for river water pumps<br />Metering/logging of flows and temperatures<br />
  13. 13. River Water Pump Station<br />
  14. 14. Existing River Water Piping Inspection<br />
  15. 15. River Water Systems Design<br />Salt water system design<br />Materials and coatings<br />Cathodic protection<br />Dual headered piping system for seasonal interior river water piping inspection<br />Replacement/refurbishment of traveling screens and sluice gates<br />
  16. 16. Interior River Water Piping Inspection<br />
  17. 17. Stakeholder Chilled Water Interface<br />Interface at each stakeholder mechanical room<br />Flow meter, temperature & pressure transmitters<br />Monitoring of interface at chiller plant<br />
  18. 18. Phased Stakeholder Loads<br />Phased loads<br />Memorial: September 2011 (partial opening)<br />Freedom Tower: October 2011<br />Transportation Hub: November 2012<br />East Bathtub Retail: November 2012<br />Two chillers with hot gas bypass to serve the Memorial partial opening<br />
  19. 19. Construction Logistics<br />Chiller plant is below grade inside the Memorial<br />The Memorial plaza at grade must be completed for partial opening (September 2011)<br />Plant access through equipment rigging hatch and shared freight elevator<br />Site access from Route 9A<br />River water pump station<br />Located below grade, under a pedestrian plaza<br />Equipment access via hatches in plaza<br />Pedestrian plaza owned by Battery Park City<br />
  20. 20. Construction Logistics<br />Coordination with other projects onsite<br />National September 11 Memorial & Museum<br />Freedom Tower<br />Vehicle Security Center<br />West Vent Structure<br />South Projection<br />Route 9A Relocation<br />
  21. 21. Construction Logistics<br />
  22. 22. Construction Logistics<br />
  23. 23. Site Wide Systems Integration<br />Fire Alarm<br />Radio systems<br />Telecommunications<br />BMS<br />
  24. 24. Contact Information<br />Hemant Mehta, P.E.<br />President<br />WM Group Engineers, P.C.<br />370 Seventh Avenue, Suite 701<br />New York, NY 10001<br />(646) 827-6500<br /><br /><br />Christopher Tso, P.E.<br />President<br />CRC Engineering, P.C.<br />1261 Broadway, Suite 608<br />New York, NY 10001<br />(212) 889-1233<br /><br /><br />