A/C Systems in Coaches: Technical Specifications
86 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the minimum cooling capacity required for each A/C unit in the coach?

  • 20,000 K.Cal/hr (correct)
  • 15,000 K.Cal/hr
  • 30,000 K.Cal/hr
  • 25,000 K.Cal/hr

    • Which refrigerant is specified for use in the A/C package unit?

  • R32
  • R410A
  • R22 (correct)
  • R134A

    • What is the rated power consumption of the compressor motor?

  • 5.25KW (correct)
  • 6.5KW
  • 4.5KW
  • 6.0KW

    • What type of refrigerant compressor is used in the A/C package unit?

    <p>Hermetic or semi-hermetic compressor</p> Signup and view all the answers

    What is the air flow capacity of the condenser fan?

    <p>5000 CFM</p> Signup and view all the answers

    What material is used for the condenser coil tubes?

    <p>Copper</p> Signup and view all the answers

    What is the diameter of the condenser fan used in the A/C unit?

    <p>533.4 mm</p> Signup and view all the answers

    What is the specified ambient temperature for the outside in wet summer conditions?

    <p>40ºC</p> Signup and view all the answers

    What is the required inside relative humidity during summer conditions?

    <p>40%</p> Signup and view all the answers

    What is the power factor of the compressor motor?

    <p>0.8</p> Signup and view all the answers

    What is the function of the adjustable vanes in the branch diffuser on the longitudinal berth's side?

    <p>To control the quantity of cool air</p> Signup and view all the answers

    Which voltage is used for supplying light and fan loads after transformation?

    <p>190V, 3Ph</p> Signup and view all the answers

    What type of transformer is used for stepping down the voltage for lighting and fan loads?

    <p>415/190V delta/star transformer</p> Signup and view all the answers

    What is the capacity of the transformer used in the power supply arrangement?

    <p>3KVA</p> Signup and view all the answers

    Which arrangement is provided for transmitting feed to adjacent coaches?

    <p>Latched and electrically interlocked coupling</p> Signup and view all the answers

    What is the voltage rating of the water raising apparatus?

    <p>240V, 1Ph</p> Signup and view all the answers

    What emergency measure is provided in case of power supply failure?

    <p>Emergency lighting battery</p> Signup and view all the answers

    How is the electrical load in the coach primarily supplied?

    <p>Using 415V, 3Ph, AC feeders</p> Signup and view all the answers

    What system voltage is supplied for the lights and fans within the coach?

    <p>190V, 3Ph</p> Signup and view all the answers

    What type of cooling effect do the diffusers aim to achieve?

    <p>Directed cool air towards lower berths</p> Signup and view all the answers

    What is the speed range (RPM) for the motors specified in the content?

    <p>1400 +/- 10%</p> Signup and view all the answers

    Which material is used for the tubes in the evaporator unit?

    <p>Copper</p> Signup and view all the answers

    What is the air flow rate in CFM for the evaporator fan?

    <p>2000 CFM</p> Signup and view all the answers

    What is the power factor for the motors mentioned in the document?

    <p>0.7</p> Signup and view all the answers

    What is the minimum fresh air introduction rate per person in the A.C. compartment?

    <p>0.35 M3/min/person</p> Signup and view all the answers

    Which type of blower is used for the evaporator fan?

    <p>Centrifugal type</p> Signup and view all the answers

    What is the specified diameter range for the evaporator fan?

    <p>254-279 mm</p> Signup and view all the answers

    What is the external static pressure rating for the evaporator fan?

    <p>15 mm Min. water gauge</p> Signup and view all the answers

    What is the tube outer diameter specified for the evaporator unit?

    <p>9.62 mm</p> Signup and view all the answers

    How many fins per cm are specified for the evaporator unit?

    <p>4.3 +/- 1</p> Signup and view all the answers

    What is the maximum weight of refrigerant allowed per circuit in the A/C package unit?

    <p>3.0 Kg</p> Signup and view all the answers

    What is the total cooling capacity provided by both A/C units in the coach?

    <p>40,000 K.Cal/hr</p> Signup and view all the answers

    What specific type of compressor is used in the A/C package unit?

    <p>Hermetic compressor</p> Signup and view all the answers

    What is the face area of the condenser coil used in the A/C unit?

    <p>0.67 M2 x 2</p> Signup and view all the answers

    What type of fan is utilized in the condenser of the A/C unit?

    <p>Propeller fan</p> Signup and view all the answers

    What is the designed current consumption of the compressor motor under typical conditions?

    <p>8.25 Amps</p> Signup and view all the answers

    How many fins per centimeter are specified for the condenser coil?

    <p>4.3 +/- 1</p> Signup and view all the answers

    What material is used for the fins of the condenser coil?

    <p>Aluminium</p> Signup and view all the answers

    What is the power factor of the compressor motor used in the A/C unit?

    <p>0.8</p> Signup and view all the answers

    What is the outer diameter of the tubes used in the condenser coil?

    <p>9.62 mm</p> Signup and view all the answers

    What is the purpose of the adjustable vanes in the branch diffuser on the longitudinal berth's side?

    <p>To control the quantity of cool air being distributed</p> Signup and view all the answers

    How is the electrical load in the coach primarily transformed for light and fan loads?

    <p>Utilizing a 415/190V delta/star transformer</p> Signup and view all the answers

    What voltage is utilized for feeding the water raising apparatus?

    <p>240V, 1Ph, 50 HZ, AC</p> Signup and view all the answers

    What is the rating of the emergency lighting battery provided on the under frame?

    <p>24V, 90AH</p> Signup and view all the answers

    Which electrical feature is arranged to control and distribute power for the 3Ph, 4 wire system?

    <p>Control and distribution panel on the coach</p> Signup and view all the answers

    What type of connection is provided for inter-vehicular power transmission in the coach?

    <p>Electrically interlocked coupling of cable and plug socket</p> Signup and view all the answers

    What is the capacity of the transformer used to step down voltage for lighting and fans?

    <p>3KVA</p> Signup and view all the answers

    In which configuration is the transformer that steps down to 190V supplied for lights and fans?

    <p>Delta/star configuration</p> Signup and view all the answers

    What is the frequency of the AC power supply for the water raising apparatus?

    <p>50Hz</p> Signup and view all the answers

    What is provided to charge the emergency lighting battery on the under frame?

    <p>Battery charging transformer rectifier unit</p> Signup and view all the answers

    What is the maximum allowable air velocity inside the main duct of the A.C. system?

    <p>360 m/min</p> Signup and view all the answers

    Which type of diffuser is provided for transverse berths in the conditioned compartment?

    <p>Type C</p> Signup and view all the answers

    What is the power consumption rating of the evaporator blower fan motor?

    <p>1.5 H.P</p> Signup and view all the answers

    What is the external static pressure rating specified for the evaporator fan?

    <p>20 mm.Min.</p> Signup and view all the answers

    What type of motor protection is indicated for the evaporator blower fan motor?

    <p>IP 44</p> Signup and view all the answers

    Which material is primarily used for the fins in the evaporator unit?

    <p>Aluminium</p> Signup and view all the answers

    What is the specified face area for the evaporator unit?

    <p>0.265 M2</p> Signup and view all the answers

    What is the current consumption of the condenser motor at 415V?

    <p>1.8 Amps</p> Signup and view all the answers

    What is the air flow capacity in CFM for the air conditioning system?

    <p>2000 CFM</p> Signup and view all the answers

    What is the specified number of fins per cm for the evaporator unit?

    <p>4.3 +/- 1</p> Signup and view all the answers

    What is the power consumption of the motor in the evaporator unit?

    <p>1.5 H.P</p> Signup and view all the answers

    What is the maximum air velocity at 150 mm below the duct/diffuser?

    <p>10 m/min</p> Signup and view all the answers

    What is the face area of the evaporator unit?

    <p>0.265 M2</p> Signup and view all the answers

    What is the prescribed air flow rate for the main duct carrying conditioned air?

    <p>2000 CFM</p> Signup and view all the answers

    What is the protection rating of the evaporator blower fan motor?

    <p>IP 44</p> Signup and view all the answers

    What is the minimum amount of fresh air introduced per person into the A.C. compartment?

    <p>0.35 M3/min</p> Signup and view all the answers

    Which of the following is the tube outer diameter specified for the evaporator unit?

    <p>9.62 MM</p> Signup and view all the answers

    What is the designed maximum air velocity at 1.2 m from floor level?

    <p>15 m/min</p> Signup and view all the answers

    What is the cooling capacity of each A/C unit in the sleeper coach?

    <p>20,000 K.Cal/hr</p> Signup and view all the answers

    Which refrigerant is used in the A/C package unit's compressor?

    <p>R22</p> Signup and view all the answers

    What type of compressor is specified for the A/C package unit?

    <p>Hermetic or Semi-hermetic Compressor</p> Signup and view all the answers

    What is the power consumption rating of the A/C compressor motor?

    <p>5.25 KW</p> Signup and view all the answers

    What is the current rating of the compressor motor at typical conditions?

    <p>8.25 Amps</p> Signup and view all the answers

    What type of fan is used in the A/C unit's condenser?

    <p>Propeller Fan</p> Signup and view all the answers

    What is the air flow capacity of the condenser fan in CFM?

    <p>5000 CFM</p> Signup and view all the answers

    What is the specified maximum weight of refrigerant allowed per circuit in the A/C package unit?

    <p>3.0 Kg</p> Signup and view all the answers

    What is the arrangement made for feeding the electrical load in the coach?

    <p>Two sets of 415V, 3Ph, 4 wire feeders</p> Signup and view all the answers

    What type of transformer is used for supplying the lighting and fan loads?

    <p>415/190V, delta/star, 3Ph transformer</p> Signup and view all the answers

    Which voltage is supplied to the water raising apparatus?

    <p>240V, 1Ph, 50Hz</p> Signup and view all the answers

    What is the purpose of the emergency lighting battery provided on the coach?

    <p>To feed emergency lights during power failure</p> Signup and view all the answers

    How is the emergency lighting battery charged?

    <p>With a battery charging transformer-rectifier unit</p> Signup and view all the answers

    What feature is included for coupling in adjacent coaches?

    <p>Latched and electrically interlocked coupling</p> Signup and view all the answers

    What type of panel is provided inside the coach for control and distribution?

    <p>415V control panel</p> Signup and view all the answers

    What is the voltage rating of the electrical supply for lights and fans after transformation?

    <p>190V, 3Ph</p> Signup and view all the answers

    What is the capacity of the transformer supplying light and fan loads?

    <p>3KVA</p> Signup and view all the answers

    What is the critical feature of the branch diffusers on transverse berths?

    <p>Made in two parts with adjustable settings</p> Signup and view all the answers

    Study Notes

    A/C 3-Tier Sleeper Coach Technical Details

    • Inside Conditions (Dry Summer):

      • DBT (°C): 24
      • WBT (°C): 40
      • RH (°C): 40

    • Inside Conditions (Wet Summer):

      • DBT (°C): 28
      • WBT (°C): 40
      • RH (°C): --

    • Cooling Capacity: Each coach has two roof-mounted A/C units with a minimum capacity of 20,000 Kcal/hr (6.6TR). Units generally conform to RDSO spec No. ELPS/SPEC/AC/01.

    • Refrigerant: Freon 22 (monochloro difluoro methane) used in hermetic or semi-hermetic compressors.

    • Compressor Make and Model: Kirloskar (Hermetically Sealed).

    • Power Consumption: Varies +/-20% depending on the ambient temperature, 5.25kW.

    • Current (Amps.): 8.25 +/-25% at 415V, 3-phase, 50Hz, AC.

    • CFM: 12.033

    • Refrigerant Condenser Volume: 117.65 CC/Rev.

    • Condenser Coil Face Area: 0.67 m² x 2

    • Condenser Coil Tube Material: Copper

    • Condenser Coil Tube O.D.: 9.62 mm

    • Condenser Coil Fin Material: Aluminium

    • Condenser Coil Fin Thickness: 0.19 mm

    • Condenser Coil Fins/cm: 4.3 +/- 1

    Refrigerant Condenser Fan

    • Diameter: 533.4 mm (21 x 2)
    • Air Flow (CFM): 5000 min. x 2

    Evaporator Unit

    • Face Area: 0.265 m² x 2
    • Tube Material: Copper
    • Tube O.D.: 9.62 mm (3/8")
    • Fin Material: Aluminium
    • Fin Thickness: 0.19 mm
    • No. of Fins/cm: 4.3 +/- 1

    Evaporator Fan

    • Diameter: 254-279 mm (10° - 11°)
    • Air Flow (CFM): 2000 (3400 cu Mtr/Hr.)

    Power Supply

    • The coach's electrical load is fed through two 415V, 3Ph, AC, 4-wire feeders.

    • These feeders are coupled to the coach via inter-vehicular couplers.

    • Each coach has a changeover arrangement on a 415V control panel.

    • A 415/190V, delta/star, 3-phase transformer (3kVA) powers the lights and fans.

    • A separate control panel/junction box provides 3Ph, 4-wire, 190V (110V, 1Ph) power for lights and fans.

    • Coupling of cables and plugs/sockets allow for adjacent coach connections.

    • Emergency lighting runs on a separate 24V, 1Ph, 50 Hz, AC system with a battery backup.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    A/C 3Tier Sleeper Coach PDF

    Description

    Test your knowledge on the technical specifications of air conditioning systems used in coaches. This quiz covers topics such as cooling capacity, refrigerants, power consumption, and equipment components. Perfect for those interested in HVAC systems and coach design.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser