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Bhopal Memorial Hospital and Research Centre Case Study on Central Air Conditioning Devvrat ,Deepshikha,Ritika,Urwashi,Tashi,Alind
13

Centralised Air Conditioning

Jan 19, 2015

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Kapil Sinha

Case Study of BMHRC Bhopal
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Page 1: Centralised Air Conditioning

Bhopal Memorial Hospital and Research Centre

Case Study on Central Air Conditioning

By Devvrat ,Deepshikha,Ritika,Urwashi,Tashi,Alind,Kapil

Page 2: Centralised Air Conditioning

IntroductionSite Chosen : BMHRC (Bhopal Memorial Hospital and Research Centre)

Location : Raisen Bypass Road ,Karond , BhopalType of Building : Hospital and Research CentreCooling Type : Central Air Conditioning (Chilled water system )

PLANT ROOM

Page 3: Centralised Air Conditioning

Plant Room

CONTROL ROOM

CHILLED WATER PIPES

WATER PUMPS

COOLING TOWERS

COMPRESSOR

CHILLER

CONDENSER

CHILLED WATER OUT7deg Celsius

CHILLED WATER IN10deg Celsius

Pipes carrying water to condensers

This plant room caters only the Hospital ,separate plant room for research centerThe plant room has a cooling capacity of 720 tons

Page 4: Centralised Air Conditioning

COOLING UNITS

COMPRESSOR• 3 pistons max

operational • Converts R22

refrigerant from low pressure to high pressure , high temperature liquid

EXPANSION VALVE• Receives sub cooled

R22 refrigerant from the condenser

• Controls flow of refrigerant

• Allows the refrigerant to expand thus cooling it down to a super cooled liquid at -30deg Celsius

CHILLER• Receives super

cooled refrigerant from expansion valve

• This coolant runs around a tube through which water is passed thus cooling it to 7deg celsius

80 ton cooling capacity per combined unit

Page 5: Centralised Air Conditioning

COOLING UNITS CONDENSER• Used for cooling of the

R22 refrigerant • R22 refrigerant runs

around a tube through which water is passed to absorb the heat from the coolant

• Has a separate loop where hot water is passing through the cooling towers,gets cooled then sent back to the condenser

CONTROL PANEL• Used for controlling the

functioning(electrical, pressure) of the units

• Automatically shuts down if a unit overloads

CATCH ALL CORE• Absorbs the humidity

in the coolant• Filters the coolant• Same as Drier filter

Page 6: Centralised Air Conditioning

COOLING TOWER FAN• Throws out warm

humidified air• Creates suction for dry

air to enter

COOLING TOWERS • Cools the hot water

coming from the condenser then sends it back

• Functions on the principle of “Evaporation causes cooling”

Cooling towers(3nos) situated just outside the plant room as there is an exchange with fresh -dry air required

COOLING TOWERS

Page 7: Centralised Air Conditioning

Control Room

CONTROL ROOM• Controls the functioning of

all the cooling units inside as well as outside the Plant room

• Includes – AHUs, Cooling towers , Compressor-condenser-chiller units controls

SIZE REQUIREMENTS

Page 8: Centralised Air Conditioning

Water Pumps

WATER PUMPS• Sends the

chilled water from the Chiller to the AHUs with adequate pressure

• Sends the warm water from the condenser to the cooling towers

300mm dia M.S pipe

50mm thick thermocole insulation

12mm thick plaster

CHILLED WATER PIPE LAYERING

Chiller line (Green Colour)

Condenser line(Blue Colour)

Page 9: Centralised Air Conditioning

FunctioningR22 coolant in vapour form

High pressure,High temperature coolant liquid

High pressure Sub cooled coolant liquid

Air cooled water at 24deg C

Warm waterat 35-40deg C

Super cooled coolant at -30deg C

Chilled water out 7deg C

Chilled water in 10deg C

Page 10: Centralised Air Conditioning

AHU Rooms

Inner walls with 150mm thermocole insulation covered with aluminum grating

Supply duct400X200mm

Return duct400X200mm

Chilled water out at 10deg C

Chilled water in at 7deg C

AHUs for Wards• These are 16 out of the

total 22 AHUs present• The return ducts bring

back the cool air from the wards

• No extra fresh air is added as it is assumed due to the presence of opening in the ward areas a small percentage of fresh air is present

TYPES OF AHU USED IN HOSPITAL COMPLEX• 100% recycle type

used in ward areas• 75% recycle and 25%

fresh airused is Opthal Ots

• 100% exhaust and 100% fresh airused in Cardio,Gastro OTs

VDF(VirtualFrequency Device)controls the electric supply to AHU(Saves energy)

AHU

Page 11: Centralised Air Conditioning

AHU RoomsPLACEMENT OF AHUs

• 3nos 100% recycle AHUs provided on the ground floor to supply to the wards

• 2nos 100%exhaust and 100%fresh air AHUs provided on the 2nd floor

• One 75%recycle and 25% fresh air AHUs also provided on the 2nd floor

SCHEMATIC VIEW OF HOSPITAL

LOCATION OF AHUs

Page 12: Centralised Air Conditioning

AHU RoomsAHU FOR OPERATION THEATRES6 Nos one for each OTThese do not recycle the air in the room100% fresh air intake!00% room air exhaust

• The floor above the OT is reserved for the duct network

• There can be no columns or beams projecting inside the OT

• The ceiling of the OT is hung with inverted beams and colums

Air passes through 3 Hepa-filters before entering the OT to kill all harmful bacteria

Ducts insulated to prevent heat gain

AHU rooms open , not insulated

Schematic section of OT area Exhaust for the OT air situated on the terrace

DUCT ROOM

AHU ROOM

Page 13: Centralised Air Conditioning

Special Arrangements

Panel in Plant room displaying the temperature of out and in Chilled water

Concrete footing

High density rubber pads

Cooling unit

Branches of 6” taken out of 12” dia chiller line to maintain appropriate pressure

Over head tanks used to make up for the evaporated water in cooling towers

HEAT PUMPHot water from the boiler room flooded into the chiller lines and functioning of all other components stopped