COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE
COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE
HVAC DESIGN BRIEF
HVAC DESIGN BRIEF
IND
INDEX OF CONTENTS
EX OF CONTENTS
SL.NO.
SL.NO.
DESCRIPTION
DESCRIPTION
PAGE NUMBER
PAGE NUMBER
5.0
5.0
HVAC
HVAC
5.1
5.1 GENERAL GENERAL 33
5.2
5.2 SCOPE SCOPE OF OF HVAC HVAC WORKS WORKS 4 4 - - 55
5.3
5.3 DESIGN DESIGN CRITERIA CRITERIA AND AND DESCRDESCRIPTION IPTION 66
5.4
5.4 CODES CODES AND AND STANDARDS STANDARDS 77–– 99
5.5
5.5 HVAC HVAC DESIGN DESIGN CONDITIONS CONDITIONS 1010
5.6
5.6 PROJECTED PROJECTED HVAC HVAC REQUIREMEREQUIREMENT NT 1111
5.7
5.7 EQUIPMENT EQUIPMENT DETAILS DETAILS 1212–– 2525
5.8
5.8 SCHEMATIC SCHEMATIC DIAGRAMS DIAGRAMS 2626
5.9
5.9 ELECTRICELECTRICAL AL LOAD LOAD LIST LIST 2727
5.10
5.10 HEAT HEAT LOAD LOAD CALCULATION CALCULATION LIST LIST 28 28 - - 2929
5.1 GENERAL
5.1 GENERAL
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. 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 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.
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.
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
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 goodINDOOR 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
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
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 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
CTI-ATC-128
ANSI / AMCA Laboratory methods for testing fans for rating as per ANSI / AMCA 210
ASME 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 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
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 %
Sl.No. Floor Reference Description of Application Carpet Area AC (sq ft) Occupancy 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 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 1 2 3 4
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.
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 around1492.0TR. 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 · Capacity, tons (kW)
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 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.
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 c o o l e r s h a l l b e i n s u l a t e d w i t h c l o s e d c e l l f o a m e d r u b b e r i n s u l a t i o n . 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
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.
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.
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.
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 : 30 (ACPH) x 26,454 / 1.7 = 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.
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.
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. 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 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.
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 HT 125 JM / 40 /6 / 9 / 25
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
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
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
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
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
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
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 Kw 0.14 KW / 1.1 KW @ 4 / 2 Pole
14 Depth of Unit Mm 455 mm
· 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.
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
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.
