Case Study of BMHRC Bhopal

1. Bhopal Memorial Hospital and
Research Centre
Case Study on Central Air Conditioning
By
Devvrat ,Deepshikha,Ritika,Urwashi,Tashi,Alind,Kapil

2. Introduction
Site Chosen : BMHRC (Bhopal Memorial Hospital and Research Centre)
Location : Raisen Bypass Road ,Karond , Bhopal
Type of Building : Hospital and Research Centre
Cooling Type : Central Air Conditioning (Chilled water system )
PLANT
ROOM

3. Plant Room
WATER
PUMPS
CHILLED WATER
PIPES
CONTROL ROOM
Pipes carrying COOLING
water to TOWERS
condensers
COMPRESSOR
CHILLED
WATER OUT
7deg Celsius CHILLER
CHILLED
WATER IN
CONDENSER
10deg Celsius This plant room caters only
the Hospital ,separate
plant room for research
The plant room has a cooling capacity of 720 tons
center

4. COOLING UNITS
80 ton cooling capacity per
combined unit
EXPANSION VALVE COMPRESSOR
• Receives sub cooled • 3 pistons max
R22 refrigerant from operational
the condenser • Converts R22
• Controls flow of refrigerant from low
refrigerant CHILLER pressure to high
• Allows the refrigerant • Receives super pressure , high
to expand thus cooled refrigerant temperature liquid
cooling it down to a from expansion valve
super cooled liquid at • This coolant runs
-30deg Celsius around a tube
through which water
is passed thus cooling
it to 7deg celsius

5. 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
CONTROL PANEL passing through the
• Used for controlling the cooling towers,gets
functioning(electrical, cooled then sent back
CATCH ALL CORE pressure) of the units to the condenser
• Absorbs the humidity • Automatically shuts
in the coolant down if a unit
• Filters the coolant overloads
• Same as Drier filter

6. COOLING TOWERS
Cooling towers(3nos) situated
just outside the plant room as
COOLING TOWERS there is an exchange with fresh -
• Cools the hot water dry air required
coming from the
condenser then sends
it back
COOLING TOWER FAN • Functions on the
• Throws out warm principle of
humidified air “Evaporation causes
• Creates suction for dry cooling”
air to enter

7. Control Room
CONTROL ROOM
• Controls the functioning of SIZE REQUIREMENTS
all the cooling units inside
as well as outside the Plant
room
• Includes – AHUs, Cooling
towers , Compressor-
condenser-chiller units
controls

8. Water Pumps
Chiller line Condenser line
(Green Colour) (Blue Colour)
300mm dia
M.S pipe
WATER PUMPS
• Sends the 50mm thick
chilled water thermocole
from the Chiller insulation
to the AHUs
with adequate 12mm thick
pressure plaster
• Sends the CHILLED WATER
warm water PIPE LAYERING
from the
condenser to
the cooling
towers

9. Functioning
High pressure,
R22 coolant in High temperature
vapour form coolant liquid
Air cooled
water at
High pressure 24deg C
Sub cooled
coolant liquid
Warm water
at 35-40deg C
Chilled water
out 7deg C
Super cooled
coolant at
-30deg C Chilled water
in 10deg C

10. AHU Rooms
TYPES OF AHU USED IN Supply duct Return duct
HOSPITAL COMPLEX Chilled water 400X200mm 400X200mm
• 100% recycle type in at 7deg C
used in ward areas
• 75% recycle and 25% Chilled water
fresh air out at 10deg C
used is Opthal Ots
AHUs for Wards
• 100% exhaust and
• These are 16 out of the
100% fresh air
total 22 AHUs present
used in Cardio,Gastro
• The return ducts bring
OTs
back the cool air from the
VDF wards Inner walls with 150mm
(Virtual • No extra fresh air is added thermocole insulation
Frequency as it is assumed due to the covered with aluminum
Device) presence of opening in the grating
controls the ward areas a small
electric supply percentage of fresh air is
to AHU present
(Saves energy)

11. AHU Rooms
PLACEMENT OF AHUs
• 3nos 100% recycle
AHUs provided on the
ground floor to supply
to the wards
• 2nos 100%exhaust
SCHEMATIC VIEW OF HOSPITAL and 100%fresh air
AHUs provided on the
2nd floor
• One 75%recycle and
25% fresh air AHUs
also provided on the
2nd floor
LOCATION OF AHUs

12. AHU Rooms
Ducts insulated to
AHU FOR OPERATION prevent heat gain
THEATRES
6 Nos one for each OT
These do not recycle the
air in the room
100% fresh air intake
!00% room air exhaust
DUCT ROOM
• The floor above the
OT is reserved for AHU ROOM
the duct network
AHU rooms open ,
• There can be no
not insulated
columns or beams
projecting inside
the OT Exhaust for
Schematic section of OT area
• The ceiling of the the OT air
OT is hung with Air passes through 3 situated on
inverted beams and Hepa-filters before the terrace
colums entering the OT to kill all
harmful bacteria

13. Special Arrangements
Cooling unit
Panel in Plant room High density
displaying the rubber pads
temperature of out Concrete
and in Chilled water footing
HEAT PUMP
Over head tanks used to Hot water from the boiler Branches of 6” taken
make up for the room flooded into the out of 12” dia chiller
evaporated water in chiller lines and line to maintain
cooling towers functioning of all other appropriate pressure
components stopped