Augmentation of Old HVAC Plant in IIT Guwahati with 2X600TR water cooled centrifugal chiller and associated works

Supplying, Installing, testing & commissioning of water cooled Positive/Negative pressure Centrifugal Type water chilling machine with unit mounted 2 stage factory fitted Variable Frequency Drive control console, with inbuilt Active Harmonic filter having THDi <= 5% (at chiller level) having a capacity of 600 TR (Minimum) at chilled water inlet / outlet temperature of 53.6 deg.F / 44.6 deg.F with suitable chilled water circulation rate and condenser water inlet / outlet temperature of 88 deg.F / 97 deg.F with suitable circulation rate, suitable for stepless continuous capacity from 100% to 20% at Constant Condenser Entering Temperature of 88 degF without surging , envelope stablity control & hot gas bypass , for operation on refrigerant R134a/Chlorine Free HFO Based. each comprising of the following complete as per specifications and as required. Maximum power consumption including VFD loss and loss due to passive harmoic filter at 100 % load (Kw/TR) ≤ 0.525 (at AHRI Condt.) & ≤ 0.572 (at Design Condt.) and NPLV : ≤ 0.35., COP≥ 6.7 Fouling Factor for Evaporator & Condenser shall be 0.0005 & 0.001 FPS unit as per following specifications (from i-xx). Condenser pressure drop : 7.0 m WC Evaporator pressure drop: 7.0 m WC

Suitable no.& capacity of Semi Hermatic Centrifugal Two stage compression system compressor complete with automatic capacity control, safety switches, forced feed lubrication system etc. as per manufacturers specifications.

Suitable no & capacity squirrel cage induction motor totally enclosed refrigerant / air cooled type. Necessary insulation suitable for operation on 415± 10% volts, 50 ± 3% Hz , AC power supply.

Suitable number & capacity unit mounted Variable Frequency Drive with passive harmonic filters suitable for compressor motor complete with ammeter with CTs, over load protection, under voltage protection against phase reversal and independent single phase preventors, timer control & trip circuit with sensing elements for HP/LP/Anti-Freeze, winding overload protection, thermistor and control etc complete as required as per manufacturer standard. THDv of the VFD shall be within 5% as per IEEE-519

Necessary drive arrangement

1 Set- Lubrication device consisting of automatic electric oil pump, oil cooler, head tank, oil strainer, automatic pressure regulating valve, oil heater, oil heater themal switch etc, as per specifications.Provision of forced lubrication of all parts during startup, running & shutdown of compressor as required as per manufacturer standard.

1 Set-Matching shell & tube water cooled condenser (shell side refrigerant and tube side potable water) of M.S/C.S shell and integrally finned copper tubes complete etc as required as per manufacturer standard.

1 Set- Matching shell & tube, flooded or falling film type chiller for centrifugal type units of MS/CS shell and integrally finned copper tubes complete etc as required as per manufacturer standard.

Lot-Refrigerant piping, fittings, valves and accessories, intercooler/economizer complete to inter connect compressor, condenser, chiller and expansion valve complete etc as required as per manufacturer standard.

Lot- Microprocessor based control panel unit mounted complete with accessories as per standard practice of manufacturer & specifications as required as per manufacturer standard.

Lot- Refrigerant line accessories comprising of safety valves, angle valve, liquid line indications, liquid level control to interconnect compressor, condenser, chiller and expansion valve. etc. as required as per manufacturer standard.

Lot- Water flow switches at inlet and outlet of condenser and chiller, water drain & air purge valves wherever required as per manufacturer standard.

Lot- Insulation in Suction line and chiller with minimum 25 mm thick polyvinyl nitrile rubber insulation at compressor suction/low temperature side

Lot- MS Frame work (including victaulic couplings at the inlet & outlet of evaporator & condenser; & painting of all components) for mounting the chilling unit with accessories viz. condenser, chiller, compressor and motor with base plate complete as required as per manufacturer standard.

Lot- Initial / first charge of refrigerant gas R134a/Chlorine Free HFO Based & compressor oil.

Lot- RCC /Cement concrete foundation for the chilling unit complete as per requirement of manufacturer.

Lot-Shock and vibration isolation for seismic zone-5. range of standard deflection of vibration isolator-20 to 30 mm

Chiller Sound Pressure level of chiller at all loads, 100%-25% at 1 M as per AHRI Standrad (575-08) shall not be more than 85 dBA, at 88 deg F

Submittal requirement form chiller manufacturer 1) AHRI /Eurovent certified performnace sheet to verify performance test at part load 100% -25% at Constant Condenser Entering Temperature of 88 degF. 2) AHRI/Eurovent certified performnace sheet to verify IkW/TR, COP at 100% load at Design, NPLV at design condition. 3) Condener Flow 1864USGPM (at design condidtion) 4) Evaporator Flow 1600USGPM (at design condition)

Chiller must be having latest BEE 5-Star rating. The model quoted must be reflecting in the BEE website for 5 Star rating.

Witness testing of the chiller unit at factory at 4 standard load points (100%, 75%, 50% and 25%) to be carried at design condition. All related cost for the testing including fooding, lodging, boarding, flight fare,VISA fair all inclusive for two persons from IIT side need to be borne by the bidder.Testing should be done on AHRI/Eurovent certified test bed.

Cost of Chiiler inclusive of first charge of refrigerant of Refrigeration capacity : 600 TR (Minimum)

Supply, installation, testing and commissioning of CHILLER PLANT OPTIMIZER (CPO) along with IP Based DDC controllers and BMS System Licensed Software chiller optimiser including all sensors and licensed software with open protocol. The plant optimizer should be able to operate with following 1. Three Chillers with provisoin for two additional chiller 2. Three Chiller isolation valves with provisoin for two additional valves 3. Two Cooling tower with provisoin for two additional CT 4. Primary pumping system 5. Secondary pumping system 6. Condenser pumping system The scope shall include i) PC - Intel I7 +Processor with min 1 TB HDD, min 8 GB RAM, with Enhanced graphic Card, Windows OS License suitable to Licensed BMS software or any latest version of OS with Anti virus, ii) 22" colour monitor flat screen LED display, iii) Necessary Licensed Software's to run the CPO iv) DDC Controllers, v) IP based uplink port switch vi) Necessary Cables (CAT 6, armoured communication), conduit/ cable tray within plant room vii) Sensor & Field Devices of following type should be considered a) Ultrasonic clamp-on type flow meter b) Differential Pressure Switch Air for CT fans c) Differential Pressure Switch Water for Pumps d) Pressure Transmitter e) Immersion Temperature Sensor with Thermowell ( Across Chiller +2 Header) f) Water level switch CT g) Water level sensor for Make up tanks h) Water pressure sensor i) Outside Air Temperature & Humidity Sensor

Supply, installation, testing and commissioning of End Suction centrifugal Back Pull out Type primary chilled water pump with CI casing, Bronze Impeller, Sleeve mechanical seal along with TEFC pump motor, 4 pole 1450 RPM for the following capacities, mounted and aligned on a common MS base and, drain assy, vibration isolators complete in all respects with insulation and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply etc. complete as required as follows.

Supplying and laying 6 SWG G.I. wire at 0.50 metre below ground level for conductor earth electrode, including connection/ termination with GI thimble etc. as required.

Supply, installation, testing and commissioning of End Suction centrifugal Back Pull out Type Secondary variable flow chilled water pump consisting of adjustable frequency drives (AFD) with CI casing, Bronze Impeller, Sleeve mechanical seal along with TEFC pump motor, 4 pole 1450 RPM for the follwoing capacities, mounted and aligned on a common MS base and, drain assy, vibration isolators complete in all respects with insulation and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply etc. Head to be calculated as per site condition etc. complete as required as follows.

Supplying and laying 25 mm X 5 mm G.I strip at 0.50 metre below ground as strip earth electrode, including connection/ terminating with G.I. nut, bolt, spring, washer etc. as required. (Jointing shall be done by overlapping and with 2 sets of G.I. nut bolt & spring washer spaced at 50mm)

Supply, installation, testing and commissioning of End Suction Back Pull Out Type Chilled Water recirculating pump with CI casing, Bronze Impeller, Mechanical Seal along with TEFC pump motor, 4 pole 1450 RPM for the following capacities complete mounted and aligned on a common MS base and, drain assy., vibration isolators complete in all respects and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply. Head to be calculated as per site condition etc. complete as required as follows.

Flow - Min 1864 USGPM and 20M Head

Providing and fixing in position of the following nominal sizes MS Heavy class chilled water piping, cut to required length and installed with welded joints complete with all necessary fittings, supports, bends, elbows, flanges, vibration isolators, gaskets, nut-bolts etc. The pipes shall be as per IS 1239 and IS 3589 standards (for pipe sizes above 150 mm NB) etc. complete as required as follows.

Providing and fixing of chilled water piping by duly insulated with 75 mm thick inside building/75 mm thick outside building TF quality expanded polystyrene foam in pipe section 16 kg/cum density covered with a layer of vapour barrier and covered with 12 mm thick sand cement plaster on GI chicken wire mesh etc. complete as required as per specifications.

SITC of Pump pressurization unit complete with mounting base frame, pressure switch, pressure gauge, isolating valves, check valves, Y-stainer, mouting arrangement, all accessories as per sepcifications and any other item reuired to make the system complete

Multistage centrifugal pressure pump of 0.75 Ltr/sec (1w+1s) @180kPa complete with all electrical panel, valve, pipes & accessories for close expansion tank. Specification: 0.85 HP, 0.55kW, RPM:2900/min

Providing and fixing in position of Following Water line Valves, Stariners and accessories as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements etc. complete as required as follows:

BUTTERFLY VALVE

Providing and fixing in position of following Water line Butterfly-Valve as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: Butterfly valve shall be of PN 16 rating as per standard. Valves of sizes 32 mm and above shall be made out of Cast Iron body, SG iron disc with Nylon coated, SS-431 Stem, EPDM integrally moulded liner with hand lever/Gear Box. Valves up to 150 mm NB shall be with detachable hand lever operation whereas valves above 150 mm NB shall have warm gear operation etc. complete as required as follows.

M NB with Gear operated

300 MM NB With Gear operated

250 MM NB With Gear operated

200 MM NB With Gear operated

100MM NB with hand lever operated

BALANCING VALVE

NON RETURN VALVE

Y-STRAINER MS

Providing and fixing in position of Pot Strainer with flange below of the following sizes etc. complete as required as follows.

FLEXIBLE BELLOW

Providing and fixing in position of GATE/BALL VALVE below of the following sizes need to be installed etc. complete as required as follows.

Providing and fixing in position of AUTO AIR VENT below of the following sizes need to be installed etc. complete as required as follows.

ELECTRICAL WORK

POWER AND CONTROL CABLING

Supply and Laying of 1.1KV Gr. XLPE armourd Aluminium FRLS Cable with termination glands and GI earthing, identification tags, clamps. Saddles etc. complete as required as per following sizes:

3.5 Core 400 sqmm XLPE Ar. Al Cable

4 Core 240 sqmm XLPE Ar. Al Cable

3 Core 50 sqmm XLPE Ar. Al Cable

3 Core 25 sqmm XLPE Ar. Al Cable

Supply and Laying of 1.1KV Gr. XLPE armourd Copper Cable with termination glands and GI earthing, identification tags, clamps. Saddles etc. complete as required as per following sizes:

Comprehensive Operation and Maintenance

Charges for Comprehensive Maintenance of 2X600TR centrifugal chiller as per MAINTEANCE SCHEDULE and guidelines of OEM after Warranty Period

Per year

COOLING TOWER

Supply, Installation, testing and commissioning of Induced Draft counter flow cooling Towers(CTI approved). The Cooling Tower shall be of Fiber Reinforced Plastic (FRP) Construction. The casing, basin/sump, fan deck and fan cylinder shall be of FRP, with direct driven fans, Galvanized hardware complete with sump and drain connection with suitable valve, PVC Honey comb fill, louvers, drift eliminator complete with spray nozzle having self rotating sprinklers, steel ladder, Isolating switch and other accessories to make it fully operational and maintaince National Accreditation Board for Testing and Calibration Laboratories (NABL) & positioning of cooling tower at Terrace of Building. Propeller Type Fan, weather proof IP 55 and Direct driven. The fan motor shall be premium efficiency IE3 class , as per IS 12615. The Cooling tower shall be capable to communicate effectively with Building Management System (BMS). Range of CT: 6 deg C. Designed Duty Conditions :-EWT, LWT, D/WBT Complete as per CPWD specification / drawings and as directed by Engineer-in-charge. ( Note - Cooling tower size depends on the ambient temperature conditions , contractor must check the required design temperature).

CONDENSATE DRAIN PIPING ( GI MEDIUM CLASS)

DIAL TYPE PRESSURE GAUGE

DIAL TYPE THERMOMETE

Supply & Fixing of GI CABLE trays made of GI slats 100 mm high and 2.6 mm thick complete with clamps and suspension arrangement comprising of MS rods (10 mm dia etc.) duly painted with polyurethane paint as per width of following sizes:

300 mm Perforated Type

225 mm Perforated Type

150 mm Perforated Type

Chemical Earthing with copper electrode including accessories, and providing masonry enclosure with cover plate ha

Supplying and laying 25 mm X 5 mm copper strip at 0.50 metrebelow ground as strip earth electrode, including connection/terminating with nut, bolt, spring, washer etc. as required.(Jointing shall be done by overlapping and with 2 sets of brass nut bolt & spring washer spaced at 50mm)

Meter