DBR for HVAC

FINAL HVAC DESIGN BASIC REPORT Sheet 1 of 15Client: Hindustan Coca-Cola Beverages Pvt. Ltd , Bidadi, Bengaluru

Client : Hindustan Coca-Cola Beverages Pvt. Ltd. Location : Bidadi, Bengaluru Consultant : ANA Design Studio Pvt. Ltd.

FINAL HVAC DESIGN BASIS REPORT

CONTENTSSection 1 : GeneralSection 2 : Specific Design NotesSection 3 : Building DescriptionSection 4 : Scope of WorkSection 5 : Standard & CodesSection 6 : Geographical DetailsSection 7 : Input Data - Basis of DesignSection 8 : Cooling LoadsSection 9 : Design ConsiderationsSection 10 : HVAC System DesignSection 11 : ControlsSection 12 : Energy ConservationSection 13 : Items to be provided by other agencySection 14 : Water Requirement

ANA DESIGN TEAMDocument No. Revision No. Prepared By Checked By Approved By DateHVAC/DBR-0 R2 Subhas Satish Amin 22.09.2012


1.0 General: This report outlines the system design, basis of design, and cooling load summary of the HVAC system.

The report has been prepared based on the information furnished and the standard data available.

While the basic system design is not likely to change, the rating and specification of the main equipment may change after firming up the detailed engineering.

2.0 Specific Design Notes:

Chilled Water Plant:Ammonia based chillers are proposed as Ammonia being most environmental friendly gas having Zero ODP and GWP rating. 2 Nos. of 350 TR capacity Ammonia Screw type chillers (both working) with minimum two compressors shall be housed in the space provided in the utility block. Ammonia chillers shall be water cooled type and separate cooling tower shall be installed near to the chillers for condenser cooling. Chilled water pumping system shall be proposed to be variable secondary pumping system for the energy saving purpose. Chilled & Condenser water pumps shall be centrifugal horizontal split casing back-pull out type for the ease of maintenance purpose. Cooling tower shall be forced draught type. Condenser & evaporator will be PHE type. Chiller plant shall have hot well and cold well capacity to provide back-up for min-10-15 minutes. Filler and sugar syrup process water requirement shall be fed from individual VFD based secondary pumping system based on the output parameters as below required by client. Cooling Load required for Process Area (Input provided by client): a) Filler - Flow - 55 KL/ hr., Inlet Temp. : 32 Deg.C Outlet Temp. : 10 Deg C b) Sugar Syrup - Flow - 15 KL/ hr., Inlet Temp. : 55 Deg.C Outlet Temp.: 25 Deg C

Process Area (double height):Separate double skinned 2 stage evaporator cooler (in mechanical spaces) with minimum filtration of 20 micros shall be provided for sugar area like CIP, Sugar dissolving, and Ready Syrup with food grade PIR ducting / rectangular ducting. 20 ACPH needed for Ready Syrup & Sugar Dissolving & 25 ACPH for CIP room needs to be maintained.2 stage evaporator cooling shall be provided for spot cooling too for the cooling purpose. ACPH shall be cross checked against the heat load calculations and whichever is higher shall be taken for maximum air flow.

2 stage evaporator exhaust will be provided through the Cabinet type DIDW backward curved fan with SS rectangular ducting inside process area..

A mechanical exhaust system will be provided for Chemical Store area to extract any fumes with 15 ACPH.

Process line Panel room: This room shall be provided air-conditioning by means of Hi-wall DX type units as per client requirement.

Kitchen:DIDW inline centrifugal Exhaust fan will be provided for kitchen area. Kitchens shall be kept at negative pressure. Since there is no cooking in kitchen area, air scrubber is not considered. No fresh air will be provided for kitchen as fresh air shall be from open area only.



Processing Area:By looking at favorable natural weather condition at the location, we are proposing Natural Ventilation system for process area at 12 ACPH. As per weather data available average wind speed through the year is 2.8 m/s and wind flow direction is mostly from south and west face of the building. Fresh air entry shall be provided at 1 Mtrs. from FFL at west and south side walls by means of Al. extruded fixed type gravity louvers with bird screen at the face. Exhaust opening will be provided at the opposite side of the fresh air entry and at the top level of building wall. This will create buoyance and stack effect of natural phenomenon of natural ventilation. In addition to this Turbo ventilator fans shall be provided at the roof level for natural exhaust purpose. The external face of the louvers for Natural Ventilation will be covered with wire mesh of not more than 6 mm to prevent entry of Birds/ Insects into premises.

Additionally turbo-ventilator fans of 2164 CFM x 92 nos shall be provided at roof sheet for natural exhaust @ 4 ACPH. Natural ventilation area provided will meet the requirement of natural smoke ventilation as per clause mentioned in NBC-2005.( ACPH at 12 to be maintained as per the clause).(Pls refer separate attached calculation sheet for detailed calculations).

Note: Actual CFD (Computational fluid Dynamics) analysis to be carried out for natural ventilation scheme to know the exact Air flow pattern &behavior. A mechanical ventilation system shall not be provided as per client requirement.

The external face of the louvers for Natural Ventilation will be covered with wire mesh of not more than 6 mm to prevent entry of Birds/ Insects into premises.

2 stage evaporator cooler spot cooling (at the location suggested by client) with round ducting and SS made jet nozzles with 26/28 Gauge SS Cladding on insulation will be provided for the human spot cooling purpose.

Ducted exhaust shall be connected from outlet of Class 10,000 Enclosure of blow moulding section of the combil line to the outside of building.

1) Direct exhaust from exhaust hood as per the location suggested by client with SS ducting without external exhuast fans as confirmed by client(Enclosure shall be supplied along with exhaust fan only)

Process Storage Area:

Natural ventilation cum smoke ventilation scheme adopted for processing area shall be maintained in the storage area. Mechanical ventilation shall not be there as a substitute as its non- critical zone used for storage.

Server RoomSeparate DX HI wall type Units (1 working + 1 standby) will be provided. This room shall be designed at temperature of is 22 +/-2 Deg. C.



Quality & Micro LabThe Quality Lab Area & Micro Lab will be 24 hrs. working. The air conditioning will be through separate wall mounted DX-split units. A mechanical exhaust system will be provided for the Micro Lab as per the standards provided by client. Whole lab AC and ventilation shall be as per the standard inputs provided by client. All lab shall be designed at temperature of is 22 +/-2 Deg. C.

Concentrate RoomThe concentrate room shall be as per Cold room application. Cold room shall be broadly designed based on the following inputs provided by client:1) type of product required inside the room-Dry and wet2) Product Entry temperature - 30 +/-2 Deg. C .3) Product Final temperature required 4 Deg. C4) Product Final temperature required for dry part - 22 Deg. C5) Pull down / Cool down time required - 24 hrs6) Daily turnover of Product (Fresh load) / Day - 2 MT ( both dry and wet parts)7) No. of door opening / Day - 8-10 times8) Occupant load –03 Nos9) Size of room – As per Architectural scheme.10) Design ambient temp- 40 Deg. C11) Consumption /day – 2MT

Offices, Reception, Training Room, Meeting Rooms & Supervisor OfficeThe air-conditioning in Main Reception, Admin Office, Shipping Office, Training Room, and meeting rooms & Supervisor Office will be through individual Hi-wall type DX Units. All this area shall be designed at temperature of is 24 +/-1 Deg. C

Shelf LifeThe Shelf Life area will be used for the sample storage; hence air conditioning will not be required, though the natural ventilation will be provided by means of louvered opening with bird screen.

Loading /Unloading Area: High velocity air curtains shall be provided at the entrance level to prevent birds /insects entry inside the premises.

Utility block : This block shall be provided with Tube axial fans for mechanical exhaust with GI ducting. No fresh air fan shall be provided for this as fresh air shall be drawn through open area or through mesh shutter.

Fresh Air provision: Fresh air shall be provided as per ASHRAE standard /NBC -2005 codes to the area.



3.0 Building Description:

The Bottling Plant is proposed to be built for Coca – Cola at Bangalore. The building details are as follows :

FLOOR AC AREA2 stage evaporator

cooling area NaturallyVentilated area

MechanicalExhaust

Ground Floor

Reception

Meeting Rooms

Quality Area Utility Block

Shelf Life

Micro Lab

Concentrate Store (cold room)

Lobby (doubleHeight

Lobby Chemical Room

Process line panel room

CIP Room

Ready Syrup

Sugar Dissolving Factory ProcessArea

First Floor

Labeling area, Shrink packer/Palletiser (spot cooling)

Cafeteria sitting arrangement area

Cafeteria kitchen area

Admin Office

Training Room Engineering Store

Server Room

Supervisor Office

Packing MaterialStore

Lobby (First Floor)

Sugar Store

Toilets



4.0 Scope of Work:

To design a “round the year” air conditioning system to maintain comfortable conditions inside the building.

The scope of work for HVAC work would include the following:

a. Water Cooled Screw type Ammonia water Chilling Units with Hot and cold vessel.(High side)b. Chilled Water Pumps with variable pumping secondary circuit. (High side)c. Condenser cooling tower with condenser water pumps (High side)d. 2 S t a g e e v a p o r a t i v e cooler Units (Double Skinned)e. Centrifugal/Axial Flow Fans/double skin cabinet type DIDW centrifugal fanf. Chilled Water & condenser water Piping including valves & fittingsg. Air distribution system including duct work, grilles, diffuses, fire dampers etc.h. O–Class Anti-bacterial, Food grade Nitrile rubber Insulation work for piping and ducting including Acoustic

work j. Automatic Controls.k. Electrical panels & cabling work etc. for A.C system from one single point provided by client.l. Natural ventilation work.m. VFD drives with VFD bypass starter panels for all equipments like pumps , 2 stage evaporator coolers , fans etc.

5.0 Standard & Codes:

The applicable standards / codes are:-a. American Society of Heating, Refrigeration and Air-Conditioning Engineer

(ASHRAE STANDARD – 90.1–2010, 62.1–2010)

b. National Building Codes – Building Services-NBC- 2005c. Indian Society of Heating, Refrigeration and Air-Conditioning Engineer (ISHRAE). d. British Standard

6.0 Geographical Details:

Location:

Bangalore lies in the southeast of the South Indian state of Karnataka. It is in the heart of the Mysore Plateau (a region of the larger Precambrian Deccan Plateau) at an average elevation of 900 m (2,953 ft). It is located at 12°58′N 77°34′E 12.97°N 77.56°E and covers an area of 741 km² (286 mi²).The majority of the city of Bangalore lies in the Bangalore Urban district of Karnataka and the surrounding rural areas are a part of the Bangalore Rural district. The Government of Karnataka has carved out the new district of Ramanagara from the old Bangalore Rural district.The topology of Bangalore is flat except for a central ridge running NNE-SSW. The highest point is Vidyaranyapura Doddabettahalli, which is 962 m (3,156 ft) and lies on this ridge. No major rivers run through the city, though the Arkavathi and South Pennar cross paths at the Nandi Hills, 60 km (37 mi.) to the north. River Vrishabhavathi, a minor tributary of the Arkavathi, arises within the city at Basavanagudi and flows through the city. The rivers Arkavathi and Vrishabhavathi together carry much of Bangalore's sewage.



A sewerage system, constructed in 1922, covers 215 km² (133 mi²) of the city and connects with five sewage treatment centres located in the periphery of Bangalore. In the 16th century, Kempe Gowda I constructed many lakes to meet the town's water requirements. The Kempambudhi Kere, since overrun by modern development, was prominent among those lakes. In the earlier half of 20th century, the Nandi Hills waterworks was commissioned by Sir Mirza Ismail (Diwan of Mysore, 1926–41 CE) to provide a water supply to the city. Currently, the river Kaveri provides around 80% of the total water supply to the city with the remaining 20% being obtained from the Thippagondanahalli and Hesaraghatta reservoirs of the Arkavathi river. Bangalore receives 800 million litres (211 million US gallons) of water a day, more than any other Indian city. However, Bangalore sometimes does face water shortages, especially during the summer season- more so in the years of low rainfall. A random sampling study of the Air Quality Index (AQI) of twenty stations within the city indicated scores that ranged from 76 to 314, suggesting heavy to severe air pollution around areas of traffic concentration. Bangalore has a handful of freshwater lakes and water tanks, the largest of which are Madivala tank, Hebbal lake, Ulsoor lake and Sankey Tank. Groundwater occurs in silty to sandy layers of the alluvial sediments. The Peninsular Gneissic Complex (PGC) is the most dominant rock unit in the area and includes granites, gneisses and migmatites, while the soils of Bangalore consist of red laterite and red, fine loamy to clayey soils. Vegetation in the city is primarily in the form of large deciduous canopy and minority coconut trees. Though Bangalore has been classified as a part of the seismic zone II (a stable zone), it has experienced quakes of magnitude as high as 4.5. ClimateBangalore experiences a tropical savanna climate (Köppen climate classification Aw) with distinct wet and dry seasons. Due to its high elevation, Bangalore usually enjoys a more moderate climate throughout the year, although occasional heat waves can make things very uncomfortable in the summer. The coolest month is December with an average low temperature of 15.4 °C and the hottest month is April with an average high temperature of 32.8 °C. The highest temperature ever recorded in Bangalore is 38.9 °C(recorded in March 1931) and the lowest ever is 7.8 °C (recorded in January 1884). Winter temperatures rarely drop below 12 °C (54 °F), and summer temperatures seldom exceed 34–35 °C (<100 °F). Bangalore receives rainfall from both the northeast and the southwest monsoons and the wettest months are September, October and August, in that order. The summer heat is moderated by fairly frequent thunderstorms, which occasionally cause power outages and local flooding. The heaviest rainfall recorded in a 24-hour period is 179 millimetres (7.0 in) recorded on 1 October 1997.

Climate data for BangaloreMonth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec YearAverage high °C (°F)

26.7(80.1)

29.3(84.7)

32.4(90.3)

32.8(91.0)

31.3(88.3)

28.7(83.7)

26.9(80.4)

27.1(80.8)

28.0(82.4)

27.5(81.5)

26.4(79.5)

25.6(78.1)

28.56(83.41)

Average low °C (°F)

15.8(60.4)

16.3(61.3)

18.9(66.0)

21.0(69.8)

20.7(69.3)

19.5(67.1)

19.0(66.2)

18.8(65.8)

18.5(65.3)

18.2(64.8)

17.5(63.5)

15.4(59.7)

18.30(64.94)

Rainfall mm (inches)

2.7(0.106)

7.2(0.283)

4.4(0.173)

46.3(1.823)

119.6(4.709)

80.6(3.173)

110.2(4.339)

137.0(5.394)

194.8(7.669)

180.4(7.102)

64.5(2.539)

22.1(0.87)

969.8(38.181)

Avg. rainy days

0.2 0.5 0.4 3.0 7.0 6.4 8.3 10.0 9.3 9.0 4.0 1.7 59.8

Mean monthly sunshine hours

263.5 248.6 272.8 258.0 241.8 138.0 111.6 114.7 144.0 173.6 189.0 211.8 2,367.4



7.0 Input Data Design Base:

The HVAC System would be designed on the following design parameters which are based on the data from the Metrological Department, ISHRAE* and ASHRAE*.

Design Parameters:

Outdoor Conditions for Bangalore will be:

As per ISHRAE

Sl. No. Condition/Season Dry Bulb Temp (˚ F)

Wet Bulb Temp (˚ F)

RH (%)

a) Summer 96 78 45

b) Monsoon 82 78 82

c) Winter 58 54 78

As per Client’s Requirement: ( Outside conditions as following shall be used for heat load calculations)

Sl. No. Outdoor Condition For Design

Dry Bulb Temp WB (%)

a) 100.4 ˚ F (38 ˚ C) 83 ˚ F (28.3 ˚C)

Indoor Design Condition: 24°C±1 ( For Office AC area other than Lab area & Server room)

Sl. No. Condition/Season Dry Bulb Temp (˚ F) Design RH (%) Uncontrolled

a) Summer 75±2 50 %

b) Monsoon 75±2 50 %



Indoor Design Condition: 22°C±2 ( For Micro-Lab ,Quality area & Server room)

Sl. No. Condition/Season Dry Bulb Temp (˚ C) Design RH (%) Uncontrolled

a) Summer 22±2 50 %

b) Monsoon 22±2 50 %

Indoor Air Quality:

ASHRAE 62.1 (USA) standards call for maintaining a desirable Indoor Air quality (IAQ) in a tightly sealed building. This is to prevent sickness syndrome in people who occupy these buildings for a long period. Oxygen rich environment is required to dilute pollutants like VOC compounds, CO2, odor etc. An adequate quantity ensures that the atmosphere in a conditioned space does not feel stale or cause irritants to the occupants. This increase in fresh air quantity increases the Air Conditioning load requirement.

Other Parameters:

Lighting Load : at ActualEquipment Load : at Actual

Fresh Air : As per ASHRAE 62.1Dehumidified air distribution : 2.5 -3.0 cfm/ft2 (in Offices) /as per HAP calculations

Floor Insulation : No insulation required External Walls : 200 mm thick aerated concrete block upto 3.5 mtr. height

Non-insulated PIR panel wall above 3.5 mtr.height ( As per Architectural requirement)

Roof : Non insulated PIR roof ( As per Architectural requirement)

Glazing : Nano Icy Menthol Coated (Assumed DGU )

U factor considered ( BTU-hr/ ft2.) : Glass : 0.32 (SHGF-0.27) Brick wall : 0.325 Concrete wall : 0.42 PEB Wall : 1.32 PEB Roof : 1.32

Floor /Concrete block : 0.42



8.0 Cooling Load: Cooling load shall be calculated on HAP- 4.51

9.0 Design Considerations:

Providing a clean, comfortable, safe environment & efficient for all personnel is a primary objective in the designing of HVAC systems. To achieve this, the design considerations are as follows:-

a. Proper control of inside temperature under varying indoor and outdoor conditions. b. Energy efficiency throughout the varying load pattern.c. Flexibility to allow shutting down of the areas not in use.d. Use of highly responsive systems with ease of maintenance.e. Providing required Indoor air quality (IAQ) with reduced operating cost.

10.0 Refrigeration System Design:

10.1 Plant room (Refrigeration System):

We have considered energy efficient water Cooled Ammonia screw type chilling units with latest technology working on environment friendly refrigerant Ammonia.

Chilled water flow will be achieved through variable independent secondary pumping system circuit for filler area and sugar syrup area.

10.1 2 stage evaporator cooling System:

2 stage evaporative system based on the efficiency factor to provide sensible cooling at 1st stage through closed loop water coil and adiabatic cooling at second stage with wet pad to achieve maximum efficiency of system.Units shall be mounted outside the building on strong platform.

2 stage evaporative system units shall be of Double skin thermal break profile Panel construction with extruded Al frame work, G.I sandwiched panels with polyurethane foam insulation and shall consist of backward curved/forward curved supply air fans, motors, normal water coils, food grade & anti-bacteria Pads, filters, controls and accessories etc.

2 stage evaporative system shall be provided with 3 stage filters (Pre-filter of 20 microns & Fine filter of 10 microns and fine filer of 5 micron) for maintaining purity of incoming air. Mechanical type DP Gauge with indication meter shall be provided for Air washer Filter Choking Status for periodical and routine maintenance. Water sump shall be made up of stainless steel as per client requirement. Air washer shall have provision for auto water level cut off with water low alarm. VFD Drive (PWM type) along with VFD bypass starter panel shall be used to modulate speed of air washer with respect to usage to save energy.

High efficiency(min.90 %) IE-3 type electric motors with voltage fluctuation 415 ±10 % & Frequency 50Hz

± 5% with combined ± 10 % fluctuation shall be used in Air Washer to reduce operational cost. To minimum pressure and to avoid water overflow due to float valve failure ; following options shall be adopted:



2 stage evaporative system make up supply line shall be fitted with PRV (pressure regulating valve) to minimum pressure so that float valve never works under pressure to avoid breakage.

10.3 Ventilation and Exhaust Systems:

Toilets /chemical store /Utility block

Ducted exhaust shall be provided to maintain 15 ACPH.

Negative pressure shall be maintained inside to avoid foul smell from spreading into adjacent public areas. Fresh air shall be taken from undercuts /Door grills/meshed rolling shutters provided .

Exhaust shall be discharged in relatively unoccupied ambient area or at high level at terrace where ever it is possible

Kitchen:

Kitchen shall be kept at negative pressure to avoid the smell from spreading into adjacent public areas. DIDW inline centrifugal Exhaust fan will be provided to exhaust hot fumes & air from kitchen area. Kitchens shall be kept at negative pressure.

Processing Area:

Processing Area will be naturally ventilated through the purpose provided openings on the wall as well as turbo-ventilator fans mounted on roof level to maintain 12 ACPH of flow rate inside the building.

10.4 Staircase Pressurization:

There are no internal staircases in the building for pressurization purpose. All staircases on the external periphery of buildings which shall be naturally pressurized by providing mesh opening on the outer face. As per the code mentioned in NBC-2005 it will fulfil the purpose of natural pressurization

10.5 Smoke Evacuation:

This is proposed by natural ventilation opening provide at roof & side walls of the building as per the NBC -2005 code.

10.6 Parking Area

Since, this area is above ground level and parking area will be open to atmosphere from all sides.

Therefore, smoke evacuation system is not required for this area.



10.7 Air Distribution System:

The air distribution system shall be designed with GI sheet metal ducting, SS ducting ( in case of exhaust duct running through process area) supply air Nozzles /Jet diffusers, grills/ registers, dampers, duct supports etc.

The ducts shall be factory fabricated as per IS/SMANCA standard. GI sheet will be as per IS-277 and fabrication will be as per IS-655.food grade silicon sealants shall be used to prevent air leakage in the duct joints.

The 2 stage evaporator unit return air shall be taken through exhaust air duct directly from Cabinet type exhaust fans mounted outside building.

For air distribution in ventilated areas, un- insulated GI duct shall be provided. SS ducting shall be used (in case of exhaust duct running through process area below false ceiling).

Alternatively, PIR panel ducts can be used. These are light-weight and do not needs to be insulated separately for air conditioning air carry.

For life saving considerations, we have considered UL listed fire dampers.

Acoustic lining shall be provided upto 5 Mtrs distance from outlet or upto first opening in the main duct by means of open cell structured nitrile rubber insulation.

Design Parameters for Duct Design:

Maximum flow velocity in AC ducts : 1700 Ft/Min

Maximum flow velocity in Ventilation ducts: 2000 Ft/Min

Maximum Friction (Per 100ft Run) : 0.08” WG

Maximum Velocity at Supply Air Outlet : 500 Ft/Min

Maximum Velocity at Return Air Inlet /Louvers : 350 Ft/Min

Insulation & Acoustic Treatment:

Ducting : 13/16 /19/25 MM thick, Density 45-60kg/m3 food grade ( only in process AC area) SS /AL. faced cladding Nitrile rubber.

Acoustic Lining : 13 mm O – Class Antibacterial food grade nitrile rubber ( Open cells structure)

10.8 Water distribution System:

The water distribution system shall consist of insulated horizontal split casing back-pull out pumps, MS ERW C class pipes for Chilled water supply & return, Insulated ERW GI pipes for drain, valves, controls, fittings etc. Water piping inside process area shall be of SS-304 L material as per the client standards.



Design Parameters for Pipe Design:

Maximum Velocity (Branches) : 7 Ft/SecMaximum Friction (Branches) : 5 Ft/100 Ft RunMaximum Velocity (Main Header) : 5 Ft/SecMaximum Friction (Main Header) : 5 ft./100 Ft Run

Pipe Insulation:

Inside premises: …

Process area: : 13/19/25 mm thick, 48-60 kg/m3 density pipe sections of food grade nitrile rubber covered 50 micron polythene vapour barrier sheet and finally covered with 28/26 gauge SS cladding

Other than process area: 13/19/25 mm thick, 48-60 kg/m3 density pipe sections of food grade nitrile rubber covered 50 micron polythene vapour barrier sheet and finally covered with 28/26 gauge AL cladding.

11.0 Controls:

Capacity controls for chilled water package units shall be as follows:

a. Controlled variable - Chilled water at 5˚C

b. Type of Control - PLC / Microprocessor based step less DDC control and multiple compressor system.

c. Controller - Thermostats in chilled water supply / Diff. Press./ Anti –freeze.

d. Capacity Range - Modulating

e. Power - Electricity at specified voltage. (415/240V).

We propose Chiller Manger Panel which shall be installed for efficient operation of the plant. This will automate changeover operation for HVAC plant room in normal as well as in fault condition. This will provide safety interlocks for start and stop operation of equipments.

PLC / Microprocessor based safety controls for refrigeration units shall be as follows:

a. Compressor high- low pressure stat.

b. Chiller freeze-up thermostat with adjustable set point between (-) 34˚F – (+) 44˚F.

c. Oil pressure safety switch.

d. Except item “C” all controls shall be hand re-set on operation.



Interlocks for refrigeration units shall be as follows:

a. Flow / pressure switches in chilled water lines to prevent compressor starting without water flow.

b. Secondary Chilled water pumps.

c. Crank case heaters to be switched on when compressor stops.

Indoor unit controls shall be as follows:

Control circuit energized when fan started.

Modulating return air thermostat shall control the refrigerant flow

12. Energy Conservation:

a. To economize on the use of energy, following main systems are proposed.

b. Energy efficient screw type chilling units with latest technology shall be provided to provide cooling effect with minimum of power consumption.

c. Adequate design to limit the losses in transmission and distribution system.

d. High efficiency (Min.90 %) (IE-3 shall be used) electric motors shall be used in IDUs & Fans /pumps /chillers etc..

e. High efficiency blowers(not less than 75% efficiency) shall be used in IDUs& Fans.

Electrical Scope for HVAC work:

Electrical Incomer will be provided by Client at one single point to the main HVAC /Refrigeration panel and all outgoings for all HVAC equipments shall be led towards equipment with proper GI earthing Strip/double copper earthing wire by HVAC scope. HVAC Vendor will make their own arrangement for the construction power & water required during construction stage.

13.0 Item To Be Provided By Other Agencies.

a. Provision of on point main 415V/3PH/50HZ electric supply with earthing for main HVAC panel, IDU/Fan panels, & 240 V/1PH/50HZ supply for units. Equipments shall be suitable for power supply variation of ±10% Voltage, ±5% Frequency & ±10% combined variation.

b. Provision of thermal insulation on the exposed roof (if required)

c. Floor traps in plant room, AC equipment Rooms etc.

d. False ceiling work, return air boxing to cover ducts/pipes etc.

e. Civil works such as foundations for A.C. equipment such as chilling units, AHUs, etc.



f. Carpentry work such as wooden frames for fixing grills/diffuses etc.

14.0 Water Requirements:

Water required is as follows:

a. In expansion tank (CHW circuit) will be approximately 1500 liters per day. b. Make up water for Cooling tower ( 2% of 2800 GPM) for chillers shall be apprxmt.3.05Lakhs

liters/day (assumed 24 hrs operation)c. Make up water required for 2 stage evaporative cooling (i.e.7 liters /hr/1000 CFM) shall be 30,000

Litres/ day (assumed 24 hrs operation)

Hence total water requirement for refrigeration and HVAC system shall be 3.36500 Lakhs liters / day (for 24 hrs. operation)

Total hardness of water should not exceed 50 ppm. In case of water hardness exceeding the above limits, water softening plant / non chemical water treatment plant shall be required

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