HVAC Services Tenders

Chilled water pipes with insulation: Supply, Installation, Testing & Commissioning of Chilled Water Piping with Insulation:Providing, supplying, installing, testing and commissioning chilled water supply and return piping complete with thermal insulation and cladding, suitable for HVAC chilled water systems, in all respects. The piping shall be fabricated from MS ERW or seamless steel pipes, conforming to IS 1239 (Heavy) / IS 3589 standards, with nominal sizes as per hydraulic design. Pipe jointing shall be butt-welded or flanged, with flanges conforming to IS 6392 / ANSI B16.5 Class 150, and all fittings such as MS elbows, tees, and reducers included as required.The piping shall be supported on MS pipe supports with anti-vibration pads, and un-insulated sections shall be painted with two coats of red oxide primer followed by two coats of synthetic enamel. Flow direction arrows and color coding shall be provided on all pipes for easy identification.Thermal insulation shall comprise rigid polyurethane foam (PUF) with density of minimum 40 ±2 kg/m³, thickness of 25 / 40 / 50 mm as specified, and thermal conductivity ≤ 0.024 W/m·K at 10°C. The insulation shall have inherent closed-cell vapor barrier, and be clad with minimum 0.6 mm thick aluminium sheet, stucco embossed, with pop-riveted joints, overlaps, and weather-proof silicon sealant. High-density PUF saddles shall be provided at all supports.The completed piping system shall be hydrostatically pressure tested at 1.5 times working pressure and shall conform to relevant IS / ASTM / ASHRAE standards. The insulation material shall be supplied from approved makes such as Lloyd / Pidilite or equivalent. The system shall be supplied with all accessories, fittings, supports, and workmanship required for proper operation, and shall carry a warranty of 12 months from the date of commissioning.

HVAC SYSTEM

Supply & Installation of top discharge hybrid VRF air conditioning system comprising of modular type high efficiency twin rotary multiple compressor with inverter type, high efficiency heat transfer cooling coil suitable for environment friendly R410a refrigerant , air cooled propeller type condenser fan with DC motor drive, interconnecting piping, suction line insulation etc. Micro-processor control panel suitable for automatic operation, high speed calculation inverter control, active oil control mechanism incorporating all safety functions as per equipment specifications & complete all as specified and as listed below:- Note : (i) The unit mounted starter panel shall be complete with IP-55 protection consisting of power disconnecting switches with fuses, starters, for compressor motors, under / over voltage trip relay, single phase preventers, communication card which can accept 4-20 mA or 2-10 Vdc analog signal. (ii) All components shall be mounted on welded steel base frame, structural steel profiles/ panels made out of galvanized sheet steel, protected with primary coat & finished with epoxy paint. (iii) Modular type outdoor units equipped with highly efficient scroll compressors, with inverter type compressor(s), special acryl precoated heat exchanger, low noise condenser fan, auto check function for connection error, auto address & UNIT Price shall be exclusive of outdoor stand price. Shifting & Installing of ODU as per drawing is part VRV vendor scope. (ODU location & capacity mentioned below). Shifting of out door units from GF to Terrace floor is part of VRF vendor scope. (iv) All VRV units should be compatible for third party BMS integration. Necessary bacnet Card / integrator should be consider in part HVAC/VRF vendor scope. (v) All unit COP should meet the Well & LEED requirements. Approx it should be more than 3.4.EER needs to be more than 13 [For >5 TR]

HVAC WORK Contractor shall submit Design and Drawings of Central Air-Conditioning System suitable for 24 Hrs hospital operation complete comprising of heat load calculations, size of pipe, size of AC duct, AHU, LT Panel, control cable, LT switch gear etc and of all the items as catered under serial Item no 2 to 101 here -in-after, which shall be dully vetted by IIT/NIT by the contractor before the same is approved by the Accepting Officer. All the AHUs installed shall be either floor mounted or ceiling suspended as applicable. Contractor will be responsible for performance guarantee of complete AC plant. AHRI Certified selection sheet for both AHRI Conditions & below mentioned parameters shall be submitted by the contractor duly vetted by the OEM. Design Parameters shall be as under:- (a) Inside room Temperature - 21°C ± 3°C (b) Relative Humidity - 55% (±5%). (c) ACH not less than 25 - For OTs only & ACH not less than 12 for balance area (d) Minimum positive pressure to be maintained 2.5 Pascal. - For OTs only (k) Time required to achieve design condition after switching on plant shall not exceed 45 minutes. (l) Air conditioning zoning of complete area shall be as per corresponding zonal requirement as per design The design and drawings of central air-conditioning system should be energy-efficient and economically viable as per the site conditions and cooling/heating requirements as elaborated. The contractor shall consider the following while submitting the design. A. Preliminary survey and data collection: (i) Visit site and study architectural, structural and electrical drawings. (ii) Assess building usage, occupancy, internal loads and ambient conditions. (iii) Identify constraints for routing refrigerant pipes, drain pipes, fresh air ducts and electrical cables. B Heat Load Calculations:- (i) Perform room-wise and system-level heat load calculations as per ISHRAE/ASHRE/NABH/NBC/ECBC ( In case of overlapping parameters among various codes, superior parameter shall be adopted) (ii) Consider building envelope, solar load, internal loads, fresh air load. (iii) Provide cooling and heating load calculations for each zone. C. System Design & Equipment Selection (i) Design the entire central air-conditioning system with following components- (a) Chilled water system (b) Hot water generator (c) Plant automization and optimization controller (d) Cooling tower (e) Condenser water pump, Primary chilled water pump, secondary chilled water pump & Hot water pump (f) Air handling unit & FCU