A/C 3Tier Sleeper Coach PDF

___________________________________________________________________________ 7. A/C 3TIER SLEEPER COACH FITTED WITH ROOF MOUNTED A/C PACKAGE UNIT WITH E.O.G. SYSTEM OF POWER SUPPLY 7.0 TECHNICAL DETAILS The A/C unit shall be capable of maintaining inside conditions...

___________________________________________________________________________ 7. A/C 3TIER SLEEPER COACH FITTED WITH ROOF MOUNTED A/C PACKAGE UNIT WITH E.O.G. SYSTEM OF POWER SUPPLY 7.0 TECHNICAL DETAILS The A/C unit shall be capable of maintaining inside conditions as under : DBT WBT RH (ºC) (ºC) (ºC) Outside (Dry Summer) 45 25 – Outside (Wet Summer) 40 28 – Inside (Dry & Wet Summer) 24 – 40 Each coach shall be provided with two roof mounted A/C units each with a minimum cooling capacity 20,000 K.Cal/hr (6.6TR). The roof mounted A/C package unit shall generally confirm to RDSO specn. No.ELPS/SPEC/AC/01. Refrigerant Compressor Hermetic or semi-hermetic refrigerant compressors working with Freon 22 (monochloro difluoro methane) are provided in the A/C package unit. The compressor motor is rated for 415V, 3Ph, 50 HZ, AC Power Supply. Make & Model – Kirloskar. Hermetically Sealed. Power Consumption – 5. 25KW +/-20% depending upon Ambient temp. Current (Amps.) – 8.25 +/- 25% at 415V, 3Ph,50HZ,AC Power Factor - 0.8 C.F.M. – 12.033 Volume – 117.65 CC/Rev. Refrigerant Condenser Refrigerant Condenser Condenser Coil – Fin-on-Tube Face Area – O.67 M2 x 2 Material of tube – Copper Tube O.D. – 9.62 mm Fin material – Aluminium Fin Thickness – 0 19 mm No. of Fins/cm – 4.3 +/- 1 ________________________________________________________________________ ___________________________________________________________________________ Refrigerant – R22,Less than 3.0Kg each circuit Condenser Fan – Propeller type (2 Nos) Diameter – 533.4 mm (21 x 2) Air Flow (CFM) – 5000 min. x 2 Pressure (External Static) – Open to atmosphere Speed (RPM) – 1400 +/- 10% Motor size – 1 H.P x 2 Current consumption (Amps) – 1.8 +/- 10%x2 at 415V, 3 Ph, 50 HZ, AC Power Factor – 0.7 The condenser motor shall confirm to 15:325-1970 with IP 55 protection confirming to 15:4691-68. Evaporator Unit – Fin-on-tube type Face Area – 0.265 M2 x 2 Material of tube – Copper Tube O.D. – 9.62 MM (3/811) Fin Material – Aluminium Fin Thickness – 0.19mm No. of fins/cm – 4.3 +/- 1 Evaporator Fan – Centrifugal type blower Diameter – 254-279 mm (10º-11 º) Air Flow (CFM) – 2000 (3400 cu Mtr/Hr.) Pressure (External Static) – 20 mm. Min. water gauge Speed (RPM) Motor size – 1400 +/- 10% Speed (RPM) Motor size – 1.5 Hp Current consumption(A) 2.2 +/- 10% at 415V, 3ph, 50HZ, AC Power Factor – 0.7 The evaporator blower fan motor shall generally conform to IS ; 325 with IP 44 protection as indicated in IS : 4691-68. 7.1 AIR CIRCULATING SYSTEM The AC system is designed to introduce fresh air at the rate not less than 0.35 3 M /min/ person into the A.C. compartment. Keeping in view the above requirement of fresh air, quantity of fresh air per package unit will not to be less than 11.7 Cu.M/min. The main duct carrying conditioned air is so designed that the air velocity inside it does not exceed 360 m/min. The air distribution system is so designed as to ensure that the ________________________________________________________________________ ___________________________________________________________________________ max. air velocity at 150 mm below duct/diffuser is 10m/min. and at 1.2 m from floor level is 15m/min Four types of diffusers are used in the conditioned compartment for distribution of cool.air. Type 'A' larger diffuser and type B smaller diffuser are provided on the main duct. Type 'C' and type 'D' diffusers are provided on the branch ducts for transverse and longitudinal berths respectively. Branch ducts of size not less than 50 mm is brought down near the window from the main duct on both sides. The diffusers on both the branch ducts are mounted in the inclined position to direct cool air towards lower berths. The branch diffuser on the longitudinal berth's side is provided with adjustable vanes to control quantity of cool air. The diffuser on branch ducts for transverse berths is made in two parts, each part directing cool air towards the lower most berths of the bay. These are also provided with variable vanes. 7.2 POWER SUPPLY ARRANGEMENT The electrical load in the coach is fed through two sets of 415V, 3Ph, AC, 4 wire feeders run along the rake and coupled to the coach with the help of inter vehicular couplers. Each coach on the rake is provided with the control, distribution and feeder changeover arrangement on 415V control panel. The 415V, 3Ph, supply is transformed with the help of a 415/190V, delta/star, 3Ph, transformer of 3KVA capacity for supplying the light and fan loads. A separate control panel/junction box is provided inside the coach for control and distribution of 3Ph, 4 wire, 190V (110V, 1Ph) system for lights and fans. Two sets of latched and electrically interlocked coupling of cable and plug socket and dummy socket one at each end panel of the coach is provided for transmitting the feed to the adjacent coaches on either side. Water raising apparatus is fed at 240V, 1Ph, 50 HZ, AC. One emergency lighting battery 24V, 90AH. is provided on the under frame to feed emergency lights in case of failure of power supply. One battery charging transformer rectifier unit is provided on the under frame to charge emergency lighting battery. ________________________________________________________________________