AIR CONDITIONING STUDY OF THE NEW YORK CITY TRANSIT SYSTEMS- PART II: FEASIBILITY OF A THERMOELECTRIC AIR CONDITIONER FOR SUBWAY CARS (FINAL REPORT)

THE REPORT FOCUSES ON FEASIBILITY AND COST ASPECTS OF THERMOELECTRIC AIR CONDITIONING FOR SUBWAY CARS IN THE NEW YORK CITY TRANSIT SYSTEM. COOLING LOAD REQUIREMENTS WERE CALCULATED FOR THE STANDARD 200-PASSENGER CAR AT NORMAL TUNNEL CONDITIONS. IT WAS DETERMINED THAT THE MAXIMUM REFRIGERATION CAPACITY NECESSARY WAS 19 TONS OF AIR CONDITIONING TO SATISFY PRE-DETERMINED LEVELS OF PASSENGER COMFORT. DETAILED COOLING-LOAD ANALYSIS IS APPENDED. THE THERMOELECTRIC AIR CONDITIONER STUDIED WAS DESIGNED TO CONVERT AVAILABLE DYNAMIC BRAKING ENERGY INTO A VIABLE POWER SOURCE FOR REFRIGERATION. HOWEVER, BRAKE ENERGY IS DISSIPATED THROUGH SEVERAL RESISTORS, NOT ALL OF WHICH PRODUCE POWER AVAILABLE TO THE AIR CONDITIONING UNIT. THEREFORE SOMEWAHT LESS THAN THE TOTAL AMOUNT OF KINETIC ENERGY COULD BE EMPLOYED TO POWER THE COOLING SYSTEM; ONLY 13 TONS OF AIR CONDITIONING COULD BE PROVIDED BY THIS POWER CONVERSION METHOD. EFFICIENCY OF THE REFRIGERATION UNIT WAS MEASURED BY A COEFFICIENT OF PERFORMANCE (COP) WHICH DELINEATES THE RATIO BETWEEN COOLING EFFECTS PRODUCED AND POWER CONSUMED. THE MOST ECONOMICAL THERMOELECTRIC AIR CONDITIONER CHILLED WATER DURING THE BRAKING PERIOD AND CIRCULATED IT THROUGH A CONTINUOUS COIL. HOWEVER, THE COP FOR THIS UNIT WAS EXTREMELY LOW AND WAS CALCULATED TO PROVIDE LESS THAN 1/3 OF THE COOLING REQUIREMENTS DETERMINED EARLIER. IT WOULD THEREFORE BECOME NECESSARY TO SUPPLEMENT THE SYSTEM WITH CONVENTIONAL VAPOR-COMPRESSION EQUIPMENT WHICH DRAWS POWER FROM THE THIRD-RAIL. A VARIETY OF THERMOELECTRIC AND VAPOR-COMPRESSION CONFIGURATIONS WERE ANALYZED. /UMTA/

  • Supplemental Notes:
    • PROJ NO NY-MTD-12
  • Corporate Authors:

    Westinghouse Electric Corporation

    Transportation Division
    Pittsburgh, PA  United States 
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00242069
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Nov 7 1972 12:00AM