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Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects1

Entask Consultancy Services (P) Ltd.

COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE HVAC DESIGN BRIEF

Architects2

Entask Consultancy Services (P) Ltd. INDEX OF CONTENTS SL.NO. DESCRIPTION PAGE NUMBER 5.0 HVAC 5.1 GENERAL 3

5.2SCOPE OF HVAC WORKS 4- 5

5.3 DESIGN CRITERIA AND DESCRIPTION 6

5.4 CODES AND STANDARDS 7 9

5.5 HVAC DESIGN CONDITIONS 10

5.6PROJECTED HVAC REQUIREMENT 11

5.7 EQUIPMENT DETAILS 12 25

5.8 SCHEMATIC DIAGRAMS 26

5.9 ELECTRICAL LOAD LIST 27

5.10HEAT LOAD CALCULATION LIST 28 - 29

5.1 GENERAL

Architects3

THIS DOCUMENT BRIEFS ON THE HVAC SYSTEM ADOPTED FOR COMMERCIAL COMPLEX @ SARJAPUR

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COMMERCIAL COMPLEX is a Commercial Complex Development of built up area of approx. 7.67 lakh

Sq.ft. with three Office blocks, Parking, other common areas and utilities. It is proposed to design the total infrastructure facility for the schedule of areas.

The schedule of areas is as follows. SL. NO. DESCRIPTION APPROX. AREA (Sq. ft) PURPOSE 1 LOWER BASEMENT 2 87,995.0 Car Parking & STP 2 LOWER BASEMENT 1 87,995.0 Car Parking 3 UPPER BASEMENT 87,995.0 Car Parking 4 GROUND FLOOR

1,10,407.0 Offices, Toilets, Electrical Rooms & Lobby 5

FIRST FLOOR

43,710.0 Offices, Toilets, Electrical Rooms & Lobby 6

SECOND FLOOR

THIRD FLOOR

FOURTH FLOOR

FIFTH FLOOR

SIXTH FLOOR

SEVENTH FLOOR

EIGHTH FLOOR

ROOF

43,399.0 HVAC Plant area & Open Terrace TOTAL AREA

7,67,471.0

NOTE: ABOVE TABULATION SUBJECT TO CHANGE BASED ON REVISION OF ARCHITECT DRAWINGS

PROJECT DESIGN BRIEF

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conditioning works out to be 2.93 lakhs Sq. ft. excluding toilets and common areas like staircases etc.

5.2 SCOPE OF HVAC DESIGN & WORKS Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects4

Entask Consultancy Services (P) Ltd. SCOPE OF HVAC DESIGN

Chilled water central plant design consisting of Hybrid combination of Chillers, Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system, Condenser ckt for Heat rejection by Cooling towers and to generate Chilled water which can deliver the desired Airside Temperature of 23+/- 1 DEG C. on the Low side.

Chilled water & Condenser water pumping design with use of Variable frequency drive for Secondary chilled water pumps.

Chilled water, Condenser water & Condensate drain piping network with routing.

Space allocation of AHU and CSU Units for all the Floors showing Scheme Drawing of all usable spaces like OFFICE blocks and etc.

Common area Air Conditioning scheme.

Appropriate Fresh air distribution of to the Office AHU s to maintain Indoor Air quality. BTU Metering and Tenant Billing system Design for enabling billing for End users based on actual consumptions.

Forced Ventilation system design for Toilets - 16 ACPH and for Sewage Treatment Plant. Ductless Ventilation system for Basement floors CAR parking @ 04 ACPH for Normal mode, 08 ACPH for Pollution mode and 30 ACPH for Fire Modes.

Air Pressurization system for escape routes in the Basement levels - Staircase and Lobby. IBMS system integration of all HVAC Equipments and Control elements.

SCOPE OF HVAC WORKS

The central Heating, Ventilation and Air-Conditioning(HVAC) system shall comprise of following: a)

HIGH SIDE EQUIPMENT

Design of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner / Project Managers.

Manufacturing as per standards & details furnished in the specifications. Assembly.

Testing in Shop before delivery. Inspection.

Insurance up to handing over. Packing & Forwarding. Transportation.

Installation at Site as per the schedule given by Owner/ PROJECT MANAGERS. Submission of method statements for execution.

Commissioning in the presence of specialized agency (manufacturer s representative). Project: Commercial Complex @ Bangalore

HVAC Design Brief Architects5

Entask Consultancy Services (P) Ltd. Performance Guarantee run.

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b)

LOW SIDE WORKS

Design of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner / Project Managers.

Manufacturing as per specifications mentioned in the document. Assembly at Site.

Commissioning.

Testing of all equipment as per the list attached in the document. Performance Guarantee run.

Handing over.

Supply of various equipment as per the relevant Specification & Drawings, unloading, receiving, inspection, storing, transportation to work site, handling, assembling, cleaning, mechanical erection, assisting main contractor in associated civil works which are required for ac system, Installation, alignment, testing and commissioning and handing over in working condition of all items covered in the BOQ.

5.3 DESIGN CRITERIA & DESCRIPTION FRESH AIR

Architects6

Entask Consultancy Services (P) Ltd. AS PER ASHRAE 62 N

Ideal air conditioning equipment should sanities cool, heat, humidify/dehumidify, evenly  distribution air through the area and all; cost effectively.

The world focus has shifted from the environment to Invironment . This is a new terminology,  being used increasingly to focus on the Indoor Air Quality (IAQ) and its effect on human health. While the outdoor environment continues to be of concern, the indoor environment is receiving increased attention as more information has become available on the presence and effect of indoor contaminants.

ASHRAE 62-1989 IAQ STANDARD:

"VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY"

From the above chart it clearly states that 20 cfm / person is the desired rate of fresh air to maintain good INDOOR AIR QUALITY (IAQ).

DESIGN ASSUMPTIONS OCCUPANCY

-80 sqft / person on built up area i.e. as per Architects area summary sheet

FRESH AIR -20 cfm / person LIGHTING LOAD -1.5 watts /sqft EQUIPMENT LOAD

-225 watts / Computer set GLAZING

-Double Glazing STP WATER

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COOLED CHILLERS

-30 KLD of Make-up water 5.4 CODES & STANDARDS

Architects7

Basically Air-conditioning system design shall be done as per latest ASHRAE Standards. Also other

applicable Standards which shall be considered as guidelines are mentioned as under:-Ø AMERICAN SOCIETY FOR HEATING, AIR CONDITIONING & REFRIGERATION ENGINEERS

(ASHRAE)

Ø FRESH AIR AS PER ASHRAE STANDARDS Ø IS WHERE EVER APPLICABLE

Ø SMACNA STANDARDS FOR SHEET METAL DUCTING Ø UL STANDARDS FOR FIRE DAMPERS

ØNBC STANDARDS WHERE EVER APPLICABLE Ø ECBC STANDARDS

The installation shall conform in all respects to ASHRPROJECT MANAGERS / Indian Standard Code of

Practice for Air conditioning Installation, tender specifications and drawings.

In case of discrepancy among specifications, drawings and other documents, the specifications take precedence over all other documents. In case of discrepancy between specification, drawings etc., & Codes & Standards, the tenderer shall assume the more stringent of the two. CODES & STANDARDS

Air Conditioning Equipment IS 659

Safety Code for air conditioning IS 660

Safety Code for mechanical refrigeration IS 3615

Glossary of terms used in refrigeration & air conditioning IS 5111

Testing of refrigeration compressors IS 7896

Data for outside design conditions for air conditioning IS 10617

Hermetic Compressors (Part-I, II & III) IS 11338

Thermostats for use in refrigeration, air conditioners etc. SP 7

National Building Code (Group 4) IS 3615

Glossary of terms used in refrigeration and air conditioning IS 7896

Outside design data condition for AC design is for summer months Noise & Vibration

IS 2264

Preferred frequencies for acoustical measurements. IS 3483

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Sound level meter for general purpose use. IS 9736

Glossary of terms applicable to acoustics in buildings. IS 9901

Measurement of sound insulation in buildings & building elements IS 9876

Guide to the measurement of air borne acoustical noise & evaluation of its effects on man.

IS 10423

Personal sound exposure meter. IS 11446

Measurement of air borne noise emitted by compressors units intended for outdoor use.

IS 12710

Glossary of terms used in acoustic emission testing. IS 4758

Methods of measurement of noise emitted by machines IS 14280

Mechanical vibration balancing shaft and fitment key  convention

IS 12065

Permissible limits of noise level for rotating electrical machines. Project: Commercial Complex @ Bangalore

Entask Consultancy Services (P) Ltd. Pipe & Fittings

IS 638 Gaskets IS 1239

Mild steel tubes & fittings IS 5822

Code of practice laying of electrically welded steel pipes for water supply.

Pump & Valves IS 778

Copper alloy gate, globe & check valves for water works purposes.

IS 4854

Glossary of terms for valves and their parts. IS 5312

Swing check type non return valves. IS 8092

Code for inspection of surface quality of steel castings for valves, fittings & other piping components.

IS 12969

Method of test for quality characteristic of valves. IS 13095

Butterfly valves for general purposes. Refrigerant Gas & Lubricants

IS 1447

Method of sampling and test for lubricants. IS 4578

Lubricating oils for refrigeration machinery IS 10609

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Sheet Metal Works IS 277

Galvanized Steel sheet IS 513

Cold rolled low carbon steel sheets. Thermal Insulation

IS 334

Glossary of terms relating to bitumen & tar IS 3069

Glossary of terms, symbols & units relating to thermal insulation materials

IS 3144

Mineral wool thermal insulation Methods of tests IS 3346

Method of determination of thermal conductivity of thermal insulation materials

IS 4671

Expanded polystyrene for thermal insulation purposes International Standards

SMACNA

HVAC Systems Duct Design SMACNA

HVAC Air duct leakage test manual SMACNA

HVAC duct construction standards Metal & flexible SMACNA

Rectangular duct construction SMACNA

Round duct construction SMACNA

Energy conservation guidelines. SMACNA

Energy recovery equipment and systems, air to air ANSI-UL-555-1985

Fire dampers ANSI

Scheme for identification of piping system SMACNA

HVAC Systems Testing, adjusting & balancing CTI

Acceptance test code for water cooling towers, mechanical draft, natural draft, fan assistant type evaluation of results and thermal testing of wet and dry cooling towers as per CTI-ATC-105- 1990 CTI

Code of measurement of sound from cooling towers as per CTI-ATC-128

ANSI / AMCA

Laboratory methods for testing fans for rating as per ANSI / AMCA 210

UL

Fire dampers as per ANSI-UL-555

Architects9

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Scheme for identification of piping system as per ANSI / ASME A-13.1

Drawings, Specifications and deviations

The drawings and specifications lay down minimum standards of equipment and workmanship. Should the tenderer wish to depart from the provisions of the specifications and drawings either on account of manufacturing practice or for any other reasons, he should clearly draw attention in his tender to the proposed points of departures and submit such complete information, Drawings and specifications will enable the merits of the deviations to be fully appreciated. In the absence of any such deviation list, it will be deemed that the tenderer is fully satisfied with the intents of the specifications and the drawings and their compliance with the statutory provisions and local codes. All deviations or departures not brought out to the notice shall be disregarded.

Units of Measurement

HVAC design documents will generally use inch-Pound (IP) Units. In those instances where both SI

and IP units are listed, the IP units take precedence of cooling and heating load calculations and equipment specification. The following listing indicates common application of Units of

Measurement for HVAC Design Documents. DUCTWORK SIZE : Millimetres OR Inches PIPE SIZE : Millimetres OR Inches AREA :

Square feet OR Square meters VELOCITY

:

Feet per minute OR Meter per Second TEMPERATURE

:

Degrees F OR Degrees C FAN/DUCT PRESSURE :

Pascal s (Pa) OR Inches of W.C. PUMP PRESSURE

:

Meters OR Feet of Liquid - Water AIR FLOW RATE

:

Cubic Feet/Minute - CFM OR Litres/Second - LPS LIQUID FLOW RATE

:

Gallons/Minute - GPM OR Litres/Second - LPS 5.5 HVAC DESIGN CONDITIONS

Architects10

Entask Consultancy Services (P) Ltd. INSIDE & OUTSIDE CONDITIONS: LOCATION:

SITE LOCATION

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GEOGRAPHICAL LOCATION

-12.58 DEG N ALTITUDE

-921 M ABOVE MEAN SEA LEVEL

The outside and inside conditions for the desired facility shall be designed based on below mentioned parameters:

INSIDE CONDITIONS: OFFICE BLOCKS 1) Dry Bulb Temperature

-23 +/- 1 DEG C. 2) Relative Humidity

-Less than 60%

The air conditioning system for the Commercial Complex facility shall be designed to cater for the Comfort cooling application only.

OUTDOOR DESIGN CONDITION: SUMMER

DRY bulb temp 35.6 DEG C WET bulb temp 25.6 DEG C RH-45 %

MONSOONDRY bulb temp 27.8 DEG C WET bulb temp 25.6 DEG C

RH -82 % WINTER

DRY bulb temp 14.4 DEG C WET bulb temp 12.2 DEG C RH -78 %

5.6 PROJECTED HVAC REQUIREMENT IN TR Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects11

Entask Consultancy Services (P) Ltd. Sl.No. Floor Reference Description of Application Carpet Area

AC (sq ft)Occ upancyTR as per Heatload CFM Fresh Air Block-A - Office 10,092.9 126 52.86 24,997 2,523 Block-B - Office 9,716.3 121

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23,394 2,429 Block-C - Office 16,043.2 201 81.13 37,952 4,011 Block-A - Office 9,027.6 113 49.48 23,709 2,257 Block-B - Office 8,823.2 110 43.68 20,292 2,206 Block-C - Office 16,043.2 201 82.83 38,999 4,011 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214 Block-C - Office 16,710.3 209 85.06 39,870 4,178 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214

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Block-C - Office 16,710.3 209 85.06 39,870 4,178 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214 Block-C - Office 16,710.3 209 85.06 39,870 4,178 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214 Block-C - Office 16,710.3 209 85.06 39,870 4,178 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214 Block-C - Office

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209 85.06 39,870 4,178 Block-A - Office 10,867.6 136 55.61 26,110 2,717 Block-B - Office 8,855.5 111 43.79 20,334 2,214 Block-C - Office 16,710.3 209 85.06 39,870 4,178 9 Eighth Floor Block-A - Office 5,433.8 68 25.01 11,332 1,358 293,780.6 3,672.26 1,491.52 698,561 73,445 Grand Total Sixth Floor 7 Seventh Floor 8 Third Floor 5 Fourth Floor Fifth Floor 6

SUMMARY OF AC TONNAGE LOADS

PURVANKARA COMMERCIAL COMPLEX PROJECT, SARJAPUR ROAD, BANGALORE Ground Floor

First Floor Second Floor 1234

The overall AC load estimate works out to be about 1492.0 TR and by applying the diversity, it is proposed to install1 30 0.0 TR of air conditioning plant.

A centralized air conditioning system is proposed with a hybrid combination of AIR COOLED SCREW

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CHILLERS of 300TR x 3nos. + 200TR x 2nos. WATER COOLED SCREW CHILLERSwith Chilled & Condenser water Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system and Condenser ckt for Heat rejection by Cooling towers.

5.7 EQUIPMENT DETAILS

Architects12

Entask Consultancy Services (P) Ltd. HVAC SYSTEM PROPOSED

Based on the data furnished in the Design Basis, the air conditioning area for the Building works out about2 ,93 ,78 0Sq.ft. excluding toilets and common areas like staircases etc. As such, the capacity of the air conditioning plant required works out to around14 92. 0TR . Applying the diversity factor of 0.87, it is proposed to install130 0.0 TR of air conditioning plant. A centralized air conditioning system is planned with a hybrid combination of AIR COOLED SCREW

CHILLERS of 300TR x 3nos. +

200TR x 2nos. WATER COOLED SCREW CHILLERSwith Chilled & Condenser water Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system and Condenser ckt for Heat rejection by Cooling towers.

v The chilled water plant consisting of Water cooled chillers system shall utilize treated water generated from the STP for make up water requirement.

v The pumping system shall comprise of Primary, Secondary and Condenser water pumps. v Secondary pumping system shall be with Variable speed pumps with VFD application to save energy during diversified load.

v The chilled water generated shall be metered by means of BTU METERS.

v The overall make up water required for Water cooled plant of400 TR capacities is around 30 KLD which is fed from the treated STP water.

v The chiller plant shall be placed in the Terrace of the building. The Water cooled chillers and pumping system shall be housed inside a closed roof.

vThe reason for a combination ofchille rs is as per the loadingp at te rn and difference in DB (Dry bulb) and WB (WET bulb) is very marginal, Hence chillers without VFD are envisaged. SYSTEM DESCRIPTION

The overall load is generated by Centralized chilled water plant which is housed in the Terrace of the building. The chilled water generated shall be distributed to each floor by means of variable speed pumping system.

The centralized chilled water generation plant consists of the following equipments: CHILLERS

On-going performance verification of chiller capacity and power input is by means of certified computerized selection output to assure the owner of specified performance in accordance with the latest version of ARI Standard 550/590 and EUROVENT STANDARDS.

All chillers that fall within the scope of the certification program have an ARI certification label at no cost to the owner. Equipment covered by the ARI certification program include all water-cooled centrifugal and screw water chilling packages rated up to 2000 tons (7,000kW) for 60 hertz service at ARI standard rating conditions, hermetic or open drive, with electric driven motor not exceeding 5000 volts, and Cooling water (not glycol). For 50 hertz application the capacity range covered is 200 to 1,000 tons (700 to 3500 kW).

Published certified ratings verified through testing by ARI include: v· Capacity, tons (kW)

v· Power, kW/ton (COP)

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v · Integrated Part Load Value (IPLV) or Non-Standard Part Load Value (NPLV)

As part of the ARI certification program, ARI has computer selection program used to select and rate chillers. The certified computer program version number and issue date for all manufacturers is listed in the ARI Directory of Certified Applied Air-Conditioning Products available

onwww.ari.org. ARI Standard 550/590-98 for Centrifugal or Screw Water - Chilling Packages and associated manuals define certification and testing procedures and tolerances of all units that fall within the application rating conditions.

DESIGN PARAMETERS FOR CHILLER SELECTION The standard rating conditions are:

Leaving chilled water temperature... ... ...44°F Evaporator waterside field fouling allowance... ...0.0001 Chilled water flow rate... ... ...2.4 gpm/ton Entering condenser water temperature... ...85°F

Condenser waterside field fouling allowance...0.00025 (for Water cooled chillers) Condenser water flow rate...3.0 gpm/ton (for Water cooled chillers) Air cooled screw chiller

Air cooled screw chillers, which are largely used in the comfort cooling industry, the chiller package shall consist of compressor-motor units, condenser coils, condenser fans, chiller, receiver, refrigerant piping & fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator, suction line insulation, first charge of oil & gas, starter panel & Micro-processor panel etc., all the components being mounted on welded steel base frame; the base frame, structural profiles & panels made of galvanized sheet steel (GSS) shall be protected with primary coating & finished with acrylic paint. The Chillers shall be suitable for outdoor installation; in other words, no weather protection of any kind by way of wall or roof is contemplated. The starter panel shall be suitable for outdoor application & shall confirm IP - 55 grade of protection. The panel shall incorporate main disconnect switches & fuses for individual motors, contactors, over load relays, single phase preventers, under/ over voltage trip, on/off push buttons, auto manual switches to facilitate automatic operation through DDC System or for manual operation to facility for remote starting & stopping of chiller packages, auxiliary contactors, etc. if any required.

Architects14

Entask Consultancy Services (P) Ltd. Water cooled screw chiller

Water cooled screw chillers, which are also largely used in the comfort cooling industry, the unit shall be completely factory assembled and wired in a single package complete with screw compressor(s), cooler, condenser, starting control, safety and operating controls, refrigerant piping & fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator, suction line insulation, first charge of oil & gas, starter panel & Micro-processor panel etc,. The unit shall be constructed from heavy gauge galvanized steel and steel "C" channel with built-in skid and lifting holes.

Evaporator

Evaporator shall be direct expansion, shell and tube type. The shell is fabricated from seamless carbon steel pipe, with finned copper tubes and tube sheets of heavy gauge carbon steel. The cooler shall be insulated with closed cell foamed rubber insulation.

Condensers

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ends for tube cleaning and servicing. The condensers shall be leak tested at working pressure and include relief valves and purge valves.

Compressor

The overall compressor design shall include a suction cooled motor, integral lubrication system utilizing compressor pressure differential and semi-hermetic design. The casing is to be

constructed from a high strength iron casting. An electric crankcase oil heater shall be provided to maintain the proper oil temperature when the system is not in operation.

COOLING TOWER SYSTEM

INDUCED DRAFT CROSS FLOW TYPE COOLING TOWERS WITH LOW NOISE AND CTI APPROVED

Architects15

Entask Consultancy Services (P) Ltd. DESIGN CRITERIA

Cooling tower thermal performance shall be certified by the Cooling Tower Institute in accordance with CTI Certification Standards STD-201 label at no cost to the owner.

The cooling towers shall be of Cross flow, Induced-draft vertical discharge type, in rectangular single or multi-cell configuration complete with Motor, Fan, Hand rails, Ladder and other

accessories etc. and designed with high efficiency drift eliminators to meet current environmental standards and guidelines for microbial control. It should be possible to hook up to BMS. The distribution system shall be gravity-feed type fitted with removable target nozzle to ensure equal water distribution over the fills. Drift eliminators shall be efficient enough to effectively limit drift loss to no more than 0.005% of the designed flow rate.

Storage capacity that needs to be planned for make up water should be at least one day consumption.

PUMPING SYSTEM Pump

The chilled water generated by the chiller plant shall be pumped to the respective floor AHU s units

and load cells by means of secondary pumping system.

The Chilled Water Pump Sets shall be back-pull out design fitted with variable frequency drive (VFD) for Secondary system. The pump shall be complete with ribbed cast iron casing, double shrouded single entry radial flow bronze impeller, mechanical seal, bearing bracket incorporating 2 nos. roller bearings, shaft, longer coupling, coupling guard, flanged connections for discharge and suction, purge /air vent/test cocks, etc

Regulatory requirements of Pumps

§Conform to Health/Life Safety Code for Public Schools § Conform to International Mechanical Code

§ Conform to BOCA National Building Code § Conform to BOCA National Fire Protection Code § Conform to State of Illinois Plumbing Code § Conform to National Electric Code NFPA 70 § Conform to Illinois Accessibility Code § Conform to applicable ANSI/HI standards

§Products: Listed and classified by Underwriters Laboratories, Inc. as suitable for the purpose specified and indicated.

Architects16

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The power ratings of the pump motor shall be larger of the following:

Ø The maximum power required by the pump from zero discharge to zero head. Ø 110% of the power required at the duty point.

Pumps of a particular category shall be identical and shall be suitable for parallel operation with equal load division. Components of identical pumps shall be interchangeable.

Pump Logic Controller (should be fully compatible to hook up to BMS / Chiller Plant Management System)

ØThe technologic pump logic controller assembly shall be listed by and bear the label of Underwriter s Laboratory, Inc. (UL)

ØThe Equipment should be able to hook up to chiller plant management system (BMS) via software integration either in ASHRAE Backnet / RTU Modbus Protocol. Necessary hardware / software for integration should be part of scope.

Ø The controller shall be specifically designed for variable speed pumping applications. ØThe controller shall function to proven program that safeguards against damaging hydraulic conditions including:

Pump flow surges Hunting

End of curve

System over pressure

Ø The pump logic controller shall be capable of receiving up to two discrete analog inputs

from zone sensor / transmitter as indicated on the plans. It will then select he analogue signal that has deviated the greatest amount from its set point. This selected signal will used as the

command feedback input for a hydraulic stabilization function to minimize hunting. Each input signal shall be capable of maintaining a different set point value. Controller shall be capable of controlling up to three pumps in parallel.

Ø The pump logic controller shall be capable of accepting an additional analog input for a flow sensor. This input shall serve as the criteria for the end of curve protection

algorithm.

ØThe pump logic controller shall be self-prompting. All messages shall be displayed in plain English. The operator interface shall have the following features:

a) Multi-fault memory and recall last 10 faults and related operational data. b) Red fault light, yellow warning light and Green power on light.

c) Soft-touch membrane keypad switches.

ØThe pump logic controller shall be of a high end type i.e., all the parameters available on the logic control panel should be able to monitor / controlled from the remote location and should housed in a NEMA 1 Enclosure.

Architects17

The display shall have four lines, with 20 characters on three lines and eight large characters on one

line. Actual pump information shall be displayed indicating pump status.

VARIABLE FREQUENCY DRIVE ENABLED SECONDARY PUMPS have been adopted forPR OPOSED

COMMERCIAL COMPLEX FOR RAMKY.

Secondary pumping would enable Substantial energy savings due to partial load profile during off peak hours.

Adjustable Frequency Drive

ØThe adjustable frequency drives shall be pulse width modulation (PWM) type, microprocessor controlled design.

ØVFD Shall is Danfoss VLT 6000 Series / ABB ACH 550 Series only.

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also meets C-UL and is CE marked and builds to ISO 9001 standards.

Ø The AFD shall be housed in a NEMA 1 enclosure. AFF with plastic enclosure shall not be acceptable.

ØThe AFD shall employ an advanced sine wave approximation and voltage vector control to allow operation at rated motor shaft output speed with no derating. This voltage vector control shall minimize harmonics to the motor to increase motor efficiency and life. Power factor shall be near unity regardless of speed or load.

Ø The VFD shall have balanced DC link reactors to minimize power line harmonics. VFDs without a DC link reactor shall provide a 3 % impedance line reactor.

Ø Input and output power circuit switching can be done without interlocks or damage to the VFD.

Architects18

BASEMENT DUCTLESS VENTILATION SYSTEM

Car Park Ventilation System for Upper Basement, Lower Basement 1 and 2 Height (m) Area (m2) Volume (m3) Upper Basement 3.9 6,783 26,454 Lower Basement 1 3.1 6,894 21,372 Lower Basement 2 2.9 7,283 21,120

Car park details

The car parking comprises of three Basement Floor cars parking with entrance & exit openings. The fresh air coming from the ramps of the Lower Ground level to the Upper Basement is sufficient.

Incase of Lower Basement 1 and 2 the fresh air from the ramps are not sufficient and hence supply

air fans are required for lower basements 1 and lower basement 2.

The Car Park system if designed for 04 for Normal mode, 08 ACPH for Pollution mode and 30 ACPH

for Emergency mode.

Upper Basement (Air Changes per Hour - ACPH): Normal Mode : 4 (ACPH) X 26,454 / 1.7 = 62,250 CFM Pollution mode : 8 (ACPH) x 26,454 / 1.7 = 1,24,500 CFM Fire mode

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= 4,66,830 CFM

Lower Basement 1 (Air Changes Per Hour - ACPH): Normal Mode : 4 (ACPH) X 21,372 / 1.7 = 50,285 CFM Pollution mode : 8 (ACPH) x 21,372 / 1.7 = 1,00,570 CFM Fire mode : 30 (ACPH) x 21,372 / 1.7 = 3,77,145 CFM

Lower Basement 2 (Air Changes Per Hour - ACPH): Normal Mode : 4 (ACPH) X 21,120 / 1.7 = 49,700 CFM Pollution mode : 8 (ACPH) x 21,120 / 1.7 = 99,400 CFM Fire mode : 30 (ACPH) x 21,120 / 1.7 = 3,72,720 CFM

Since the car park is envisaged to have a common extract shaft, we have considered the following.

Extract Fan Selections for Upper Basement, Lower Basement 1 and 2:

We have taken a DIVERSITY FACTOR that fire will happen in Single basement only. Hence, the system is designed for Emergency mode in the Largest Basements i.e. 30 ACPH (1st Basement) - 4,66,830 CFM which also ensures 8 ACPH during Normal mode in all 3 basements.

No. of Extract shaft : 4 No.

No. of Fans in each shaft : 3 Nos

Total No. of Extract Fans : 4 x 3 = 12 Nos.

Capacity of each Extract fan

: 4,66,830 / 12 = 39,000 CFM @ 25 mm WC. Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects19

Entask Consultancy Services (P) Ltd. Each Extract Fan Shaft Size

: 6 X 2 Metres.

For Lower Basement 1: No. of Supply shaft : 2 Nos.

No. of Supply Fans / Shaft : 2 Nos.

Total No. of Supply Fans : 2 x 2 = 4 Nos

Capacity of Supply fan : 20,000 CFM 25 mm WC. Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres.

For Lower Basement 2: No. of Supply shaft : 2 Nos.

(20)

: 2 Nos.

Total No. of Supply Fans : 2 x 2 = 4 Nos

Capacity of Supply fan : 20,000 CFM 25 mm WC. Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres.

Jet Fan and Extract Fan System Description: PPM Level

ACPH Jet Fan

Total No. of Extract Fans 12 Nos. 0-25 ppm

4 Off

4 Fans will operate Ø 25 ppm

8

Low Speed

8 Fans will operate Emergency Mode 30

High Speed

All 12 Fans will operate

0-25 ppm: When the CO level in the car park is between 0-25 ppm the Jet Fan are in the Off mode,

4 Nos. of Extract fans will be running to achieve 4 ACPH in all 3 Basements.

> 25 ppm:When the CO level in the car park is greater than 25 ppm the Jet Fans will be operated at Low speed and 8 Nos. of extract fans will be running to achieve 8 ACPH in all 3 Basements. Emergency mode:During the emergency mode the Jet Fans will be operated at full speed,

12 Nos. of extract fans will be running to achieve 30 ACPH in the Basement where smoke is to be removed quickly.

Architects20

Extract Fan Selections for Parking Upper Basement, Lower Basement 1 and 2: Note: The Extract Fans are designed for 300 Degree C for one hour

BEFORE CFD ANALYSIS

AFTER CFD ANALYSIS AND JETFAN POSITIONING

Our Ref: TAP/CP/B/2007/ 098 Dt: 06 / 10 / 2007 Units Specifications Qty. Nos 12 Duty Volume CFM 39,000 Static Pressure mmWC 25 Selected Model

(21)

Blower Type Axial Fan Fan Diameter mm 1250 No of Blades 9 Fan Casing Long

Absorbed Shaft Power KW

10.74 Shaft RPM RPM 960

Recommended High Temperature Motor Single Speed KW

15 KW / 6pole

Sound Level @ 3 Metres Dba

76

Architects21

Entask Consultancy Services (P) Ltd. Supply Fan Selections Lower Basement 1:

Note: the Supply fans are designed for 50 Degree C Units Specifications Qty. Nos 2 Duty Volume CFM 20,000 Static Pressure mmWC 25 Selected Model 100JM / 40 / 6 / 9 / 32 Blower Type Axial Fan Fan Diameter mm 1000 No of Blades 9 Fan Casing Long

(22)

KW

7.5 KW / 6 Pole

71

Sound Level after Silencer Dba

60

Architects22

Entask Consultancy Services (P) Ltd. Supply Fan Selections Lower Basement 2: Units Specifications Qty. Nos 2 Duty Volume CFM 20,000 Static Pressure mmWC 25 Selected Model 100JM / 40 / 6 / 9 / 32 Blower Type Axial Fan Fan Diameter mm 1000 No of Blades 9 Fan Casing Long

Recommended Motor Single Speed KW

7.5 KW / 6 Pole

71

Sound Level after Silencer Dba

60

Architects23

Entask Consultancy Services (P) Ltd. SPECIFICATIONS FOR JET FANS

(23)

Technical Data / Technical specifications of the JET THRUST FAN UNIT offered

Qty required : Upper Basement+Lower Basement 1+Lower Basement 2 =23+23+24 = 70 Nos. Jet fans are with silencers & mounting assembly

JETFAN

Sound level is measured at 1.5-meter distance in reference value in parking areas Note: The jet fans are designed for 300 Degree C for one hour

Overall system description: ·

The vehicle entrance & exit ramps shall be utilized as the main source of fresh air into the car park for First Basement.

·

It is proposed the extract points are located as shown on the marked drawing enclosed to you in separate mail. The location of these extract points have been chosen to ensure the best

distribution of the inlet airflow as possible and suitability for a system comprising of Jet Fan units as per the geometry of the Car Parking Area.

No. Description Unit Technical details 1 Nozzle Dia Mm 350 mm 2 Air Flow M3/sec 0.9/1.8 m3/sec @ 4 / 2 Pole 3 Capacity of Fan Cfm 1905 / 3810 Cfm 4 Tip Velocity m/s 16 5 Phase Ph 3 6 Voltage V 420 7 Frequency Hz 50 8 Revolution RPM 1420 /2840RPM 9 Ampere A 0.63 / 2.38 @ 4 / 2 Pole 10 Sound Level dB (A) 53 / 65 @ 4 / 2 Pole 11 Weight Kg 80 12 Power Consumption KW 0.1 KW / 1.0 KW @ 4 / 2 Pole 13 Rated Motor Power

(24)

Kw 0.14 KW / 1.1 KW @ 4 / 2 Pole 14 Depth of Unit Mm 455 mm 15 Thrust Nm 8/32

Architects24

Entask Consultancy Services (P) Ltd. ·

Extract grilles would be located at high level. ·

In case of main power failure the Extract Fans shall be provided with alternate source of power. ·

All of the fans will be controlled via PLC based control panel separately for each Basement. The logic shall be arrived separately for pollution mode and emergency mode separately. An interlink will need to be provided to allow communication between panels and also the BMS.

·

For the Pollution mode it is proposed that the extract fans in all Basements Floor are operated to provide 8 ACPH. It is suggested that a Carbon Monoxide (CO) detection system is provided to control the background ventilation rate depending on car park usage and detected levels of CO. Details of a suitable detection head for this application can be provided if required. The type of detector that would be recommended is an analogue type detector with a 4-20mA signal. This will allow for detection of varying levels of CO, typically in the ranges 0-30, 30-50, >50 PPM where the frequency of supply to the main fans can be adjusted accordingly via the main control panel. ·

Jet Fan units would be installed at ceiling level and positioned accordingly within the car park to provide the best distribution of the inlet air flow as possible.

·

The final installed locations of the Jet fans and mode of operation of these fans would be determined at the time of the detailed design in which techniques of Computational Fluid Dynamics (CFD) will be used to model the air movement with the car park. A more detailed description of the CFD to be carried out can be provided upon request.

Control equipment:

(8+8+8) 24 Nos. for basement floor On / off type carbon monoxide (CO) detection. With CO detection in place the ventilation system would run on demand during peak periods when there is highest car park activity. The benefit of this over the conventional approach is ventilating all the time at 6 ACPH will be seen in reduced operating costs and noise levels.

Incoming electrical supply ·

Dual Incomer

CO GAS DETECTOR

KEY ELEMENTS OF DESIGN IN VIEW TO ACHIVE ENERGY SAVINGS: Ø System with combination of Air cooled and Water cooled screw chillers. Ø Chillers with R-134a Eco-friendly Refrigerant gas.

Ø Variable speed Pumping to save energy during diversified loads of Offices. ØUse of IBMS system to run the system efficiently by close monitoring and trends.

(25)

ENERGY CONSERVATION AND ENVIRONMENTAL CONCERN

ØWITH THE INCREASE IN DEMAND OF ENERGY CONSUMPTION, I.E ELECTRICITY, THE AVAILABILTY OF POWER BECOMES A MAJOR CONCERN.

ØSINCE THE CONSUMPTION OF POWER IS DIRECTLY RELATED TO GENERATION USING FOSSIL

FUELS, IT S EVIDENT THAT IT IS HARMFUL TO THE ENVIRONMENT.

ØHENCE THE DESIGN ADOPTED FOR THIS COMMERCIAL COMPLEX IS IN VIEW OF NOT ONLY

ATTAINING MAXIMUM DEMAND POWER FOR HVAC TO BE ECONOMISED, BUT ALSO TO HAVE

ENERGY EFFICIENT SYSTEM. APPROVED MAKES OF MATERIALS AIR / WATER COOLED CHILLERS COOLING TOWERS

AHU S / CSU S / FCU S TFA S    PRIMARY & CONDENSER WATER PUMPS

SECONDARY PUMPS

CLOSED LOOP EXPANSION TANK AIR SEPERATOR / AUTO AIRVENT MS PIPE

BUTTERFLY VALVES

PRESSURE INDEPENDENT BALANCING CUM CONTROL VALVES

Y STRAINER / SUCTION GUIDE NON RETURN VALVE

PPRESSURE GAUGE & THERMOMETER RPUF INSULATION

INLINE FANS GI SHEET

GRILLES & DIFFUSERS / VCD / FIRE DAMPER

CLOSED CELL NITRILE RUBBER INSULATION

Architects26

Entask Consultancy Services (P) Ltd. 5.8 SCHEMATIC DIAGRAMS HEAT LOAD SUMMARY

The overall AC load estimate works out to be about 1492.0 TR and by applying the diversity, it is proposed to install1 30 0.0 TR of air conditioning plant.

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