SINGLE TRACT SUBWAY ENVIRONMENTAL SIMULATION MODEL--PHASE I

THE ST-SES MODEL, A DESIGNER-ORIENTED COMPUTER PROGRAM WHICH SIMULATES THE OPERATION OF TRAINS IN A SINGLE-TRACK SUBWAY SYSTEM AND COMPUTES THE RESULTANT AIR FLOWS, TEMPERATURES, AND HUMIDITIES, IS DESCRIBED. THE COMPUTER PROGRAM COMPRISES THREE INDEPENDENT COMPUTATIONAL SEQUENCES WHICH PROVIDE A CONTNUOUS SIMULATION OF DYNAMIC PHENOMENA INFLUENCING THE QUALITY OF A SUBWAY ENVIRONMENT. THE TRAIN PERFORMANCE SUBPROGRAM SIMULATES THE AMOUNT OF HEAT PRODUCED BY THEIR OPERATION. OUTPUT FROM THE SUBPROGRAM INCLUDES THE POSITION, VELOCITY, AND RATE OF ACCELERATION OR BRAKING OF ALL TRAINS IN THE SYSTEM ON A SECOND-BY-SECOND BASIS. THE AERODYNAMIC SUBPROGRAM PROVIDES CONTINUOUS READINGS OF THE AIR VELOCITIES AND FLOW RATES IN ALL SUBWAY STATIONS, TUNNELS, AND VENTILATION SHAFTS. THIS SUBPROGRAM COMPUTES AIR FLOWS GENERATED BY THE PISTON ACTION OF TRAINS IN THE TUNNELS AS WELL AS THOSE INTRODUCED BY MECHANICAL VENTILATION. THE TEMPERATURE AND HUMIDITY SUBPROGRAM COMPUTES CONTINUOUS, SECOND-BY-SECOND VALUES FOR THE SENSIBLE AND LATENT CONTENT OF THE AIR IN SUBWAY STATIONS, TUNNELS, AND VENTILATION SHAFTS. THESE COMPUTATIONS INCLUDE CONSIDERATION OF ALL SUBWAY HEAT INPUTS (TRAIN OPERATIONS, PASSENGER METABOLIC HEAT, VEHICLE AIR CONDITIONING, ETC.) AS WELL AS THE COMPENSATORY PHENOMENA (VENTILATION, AIR CONDITIONING. HEAT CONDUCTION TO TUNNEL WALLS, ETC). A LONG-TERM HEAT SINK COMPUTER PROGRAM WAS ALSO DEVELOPED TO INVESTIGATE THE NATURE OF DEEP HEAT SINK SURROUNDING A SUBWAY TUNNEL. THE RESULTS OF AN ST-SES DEMONSTRATION INVOLVING THE OPTIMUM CONFIGURATION OF AIR CONDITIONING EQUIPMENT AND VENT SHAFT LOCATION IS INCLUDED. /UMTA/

  • Supplemental Notes:
    • PROJ NO DC-MTD-7
  • Corporate Authors:

    Parsons Brinckerhoff Quade and Douglas, Incorporated

    One Penn Plaza
    New York, NY  United States  10119
  • Publication Date: 1971-8

Subject/Index Terms

Filing Info

  • Accession Number: 00242056
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Oct 23 1976 12:00AM