12 - HVAC Design Brief

Project: Commercial Complex @ Bangalore Bangalore

HVAC Design Brief 

COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE

HVAC DESIGN BRIEF

 Architects 1

 Entask Consultancy Services (P) Ltd. Ltd.

Project: Commercial Complex @ Bangalore Bangalore

HVAC Design Brief 

INDEX INDEX OF CONTENTS

DESCRIPTION

SL.NO.

5.0

PAGE NUMBER 

HVAC 5.1 GENERAL

3

5.2 SCOPE OF HVAC WORKS

5.3

DESIGN CRITERIA AND DESCRIPTION DESCRIPTION

5.4 CODES AND STANDARDS

5.5

4-5

6

7–9

HVAC DESIGN CONDITIONS

10

REQUIREME NT 5.6 PROJECTED HVAC REQUIREMENT

11

5.7 EQUIPMENT DETAILS

12 – 25

5.8

SCHEMATIC DIAGRAMS

26

5.9

ELECTRICAL ELECTRIC AL LOAD LIST

27

5.10 HEAT LOAD CALCULATION LIST

5.1 GENERAL

 Architects 2

 Entask Consultancy Services (P) Ltd. Ltd.

28 - 29

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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

ROAD, BANGALORE.

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. 1

LOWER BASEMENT – 2

APPROX. AREA (Sq. ft) 87,995.0

2

LOWER BASEMENT – 1

87,995.0

Car Parking

3

UPPER BASEMENT

87,995.0

Car Parking

4

GROUND FLOOR

5

DESCRIPTION

PURPOSE Car Parking & STP

1,10,407.0

Offices, Toilets, Electrical Rooms & Lobby

FIRST FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

6

SECOND FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

7

THIRD FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

8

FOURTH FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

9

FIFTH FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

10

SIXTH FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

11

SEVENTH FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

12

EIGHTH FLOOR

43,710.0

Offices, Toilets, Electrical Rooms & Lobby

13

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 COMMERCIAL COMPLEX is a Commercial Complex Development of overall carpet area for air 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  Architects 3

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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 M odes. Air Pressurization system for escape routes in t he 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 t he 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 b efore 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).

 Architects 4

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

Performance Guarantee run. Handing over.

b)

LOW SIDE WORKS Design of the equipment based on t he 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 

 Architects 5

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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  REQUIRED FOR WATER  COOLED CHILLERS

-

30 KLD of Make-up water

5.4 CODES & STANDARDS

 Architects 6

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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

Ø

NBC 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 Code of practice for noise reduction IS 3932 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.

 Architects 7

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

Pipe & Fittings IS 638 IS 1239 IS 5822

Gaskets Mild steel tubes & fittings 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 Refrigerants – Number – Designation 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 CTIATC-128 ANSI / AMCA Laboratory methods for testing fans for rating as per ANSI / AMCA 210 UL Fire dampers as per ANSI-UL-555

 Architects 8

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

ASME

HVAC Design Brief 

Scheme for identification of piping system as per ANSI / ASME A13.1

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 d eemed that the tenderer is fully satisfied with the intents of the specifications and the drawings and their compliance with t he 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 i nch-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

 Architects 9

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

INSIDE & OUTSIDE CONDITIONS: LOCATION: SITE LOCATION

-

BANGALORE

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 %

MONSOON

DRY 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 

 Architects 10

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

SUMMARY OF AC TONNAGE LOADS PURVANKARA COMMERCIAL COMPLEX PROJECT, SARJAPUR ROAD, BANGALORE Sl.No.

1

2

3

4

5

6

7

8

9

Floor Reference

Description of  Application

Carpet Area Occupancy AC (sq ft)

TR 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

49.80

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

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

16,710.3

209

85.06

39,870

4,178

Block-A - Office

10,867.6

136

55.61

26,110

2,717

Seventh Floor 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

5,433.8

68

25.01

11,332

1,358

293,780.6

3,672.26

1,491.52

698,561

73,445

Ground Floor

First Floor

Second Floor

Third Floor

Fourth Floor

Fifth Floor

Sixth Floor

Eighth Floor

Grand Total

The overall AC load estimate works out to be about 1492.0 TR  and by applying the diversity, it is proposed to install 1300.0TR  of air conditioning plant. A centralized air conditioning system is proposed w ith a hybrid combination of AIR COOLED SCREW CHILLERS of 300TR x 3nos. + 200TR x 2nos. WATER COOLED SCREW CHILLERS with 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

 Architects 11

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

HVAC SYSTEM PROPOSED Based on the data furnished in the Design Basis, the air conditioning area for the Building works out about 2,93,780Sq.ft. excluding toilets and common areas like staircases etc. As such, the capacity of the air conditioning plant required works out to around 1492.0TR. Applying the diversity factor of 0.87, it is proposed to install 1300.0TR  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 CHILLERS with 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 r equirement.

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 of  400TR  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.

v

The reason for a combination of  chillers is as per the loading pattern 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 f ollowing 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 v v

· Capacity, tons (kW) · Power, kW/ton (COP) · Pressure drops, ft. of water (kPa)

 Architects 12

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

v

HVAC Design Brief 

· 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 on www.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.

 Architects 13

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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 Condensers shall be shell and tube type and the condensers shall have removable heads on both 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

 Architects 14

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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 l east 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.

 Architects 15

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

DESIGN REQUIREMENTS 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 t he 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) Ø

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

Ø

The 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.

Ø

The 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.

Ø

The 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. Ø

The 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.

 Architects 16

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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 for PROPOSED COMMERCIAL COMPLEX FOR RAMKY.

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

Adjustable Frequency Drive Ø

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

Ø

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

Ø

The AFD, including all factory-installed options, be tested to UL standard 508. The AFD 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.

Ø

The 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.

 Architects 17

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

BASEMENT DUCTLESS VENTILATION SYSTEM Car Park Ventilation System for Upper Basement, Lower Basement 1 and 2 Height (m)

Area 2 (m )

Volume 3 (m )

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 Pollution mode Fire mode

: 4 (ACPH) X 26,454 / 1.7 : 8 (ACPH) x 26,454 / 1.7 : 30 (ACPH) x 26,454 / 1.7

= 62,250 CFM = 1,24,500 CFM = 4,66,830 CFM

Lower Basement 1 – (Air Changes Per Hour - ACPH): Normal Mode Pollution mode Fire mode

: 4 (ACPH) X 21,372 / 1.7 : 8 (ACPH) x 21,372 / 1.7 : 30 (ACPH) x 21,372 / 1.7

= 50,285 CFM = 1,00,570 CFM = 3,77,145 CFM

Lower Basement 2 – (Air Changes Per Hour - ACPH): Normal Mode Pollution mode Fire mode

: 4 (ACPH) X 21,120 / 1.7 : 8 (ACPH) x 21,120 / 1.7 : 30 (ACPH) x 21,120 / 1.7

= 49,700 CFM = 99,400 CFM = 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 No. of Fans in each shaft Total No. of Extract Fans Capacity of each Extract fan

 Architects 18

: 4 No. : 3 Nos : 4 x 3 = 12 Nos. : 4,66,830 / 12 = 39,000 CFM @ 25 mm WC.

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

Each Extract Fan Shaft Size For Lower Basement 1:

: 6 X 2 Metres.

No. of Supply shaft No. of Supply Fans / Shaft Total No. of Supply Fans Capacity of Supply fan Supply Fan Shaft Cut Out Size

: 2 Nos. : 2 Nos. : 2 x 2 = 4 Nos : 20,000 CFM 25 mm WC. : 3.25 X 2 Metres.

For Lower Basement 2: No. of Supply shaft No. of Supply Fans / Shaft Total No. of Supply Fans Capacity of Supply fan Supply Fan Shaft Cut Out Size

: 2 Nos. : 2 Nos. : 2 x 2 = 4 Nos : 20,000 CFM 25 mm WC. : 3.25 X 2 Metres.

Jet Fan and Extract Fan System Description:

Ø

Total No. of Extract Fans – 12 Nos.

PPM Level

ACPH

Jet Fan

0-25 ppm

4

Off

4 Fans will operate

8

Low Speed

8 Fans will operate

30

High Speed

All 12 Fans will operate

25 ppm

Emergency Mode

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 runni ng 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 a chieve 8 ACPH in all 3 Basements.

Emergency mode: During the emergency mode the Jet Fans wil l 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.

 Architects 19

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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

Specifications

Qty.

Nos

12

Duty Volume

CFM

39,000

mmWC

25

Static Pressure

HT 125 JM / 40 /6 / 9 / 25

Selected Model

Axial Fan

Blower Type mm

Fan Diameter

1250 9

No of Blades

Long

Fan Casing 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

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

 Architects 20

Dt: 06 / 10 / 2007

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

Supply Fan Selections – Lower Basement 1:

Qty.

Units Nos

Specifications 2

Duty Volume

CFM

20,000

mmWC

25

Static Pressure

100JM / 40 / 6 / 9 / 32

Selected Model

Axial Fan

Blower Type mm

Fan Diameter

1000 9

No of Blades

Long

Fan Casing Absorbed Shaft Power

KW

5.61

Shaft RPM

RPM

960

Recommended Motor Single Speed

KW

7.5 KW / 6 Pole

Sound Level @ 3 Metres

Dba

71

Sound Level after Silencer

Dba

60

Note: the Supply fans are designed for 50 Degree C

 Architects 21

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

Supply Fan Selections – Lower Basement 2:

Qty.

Units Nos

Specifications 2

Duty Volume

CFM

20,000

mmWC

25

Static Pressure

100JM / 40 / 6 / 9 / 32

Selected Model

Axial Fan

Blower Type mm

Fan Diameter

1000 9

No of Blades

Long

Fan Casing Absorbed Shaft Power

KW

5.61

Shaft RPM

RPM

960

Recommended Motor Single Speed

KW

7.5 KW / 6 Pole

Sound Level @ 3 Metres

Dba

71

Sound Level after Silencer

Dba

60

 Architects 22

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

SPECIFICATIONS FOR JET FANS 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 No. Description

Unit

Technical details 350 mm

1

Nozzle Dia

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

Kw

0.14 KW / 1.1 KW @ 4 / 2 Pole

14

Depth of Unit

Mm

455 mm

15

Thrust

Nm

8/32

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 t he Car Parking Area.

 Architects 23

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

·

·

·

·

·

·

HVAC Design Brief 

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 b est 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.

Ø

Use of IBMS system to run the system efficiently by close monitoring and trends.

 Architects 24

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

ENERGY CONSERVATION AND ENVIRONMENTAL CONCERN Ø

WITH THE INCREASE IN DEMAND OF ENERGY CONSUMPTION, I.E ELECTRICITY, THE

AVAILABILTY OF POWER BECOMES A MAJOR CONCERN. Ø

SINCE THE CONSUMPTION OF POWER IS DIRECTLY RELATED TO GENERATION USING FOSSIL FUELS, IT’S EVIDENT THAT IT IS HARMFUL TO THE ENVIRONMENT.

Ø

HENCE 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

 Architects 25

 Entask Consultancy Services (P) Ltd.

Project: Commercial Complex @ Bangalore

HVAC Design Brief 

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 install 1300.0TR  of air conditioning plant.

 Architects 26

 Entask Consultancy Services (P) Ltd.