MEP Coordination
• Infographic Style
Meet
The Instructor
Mohamed Alaa
Principal Electrical Engineer
Instructor in Round 2
Fb/Mohamed Alaa
Instructor in Rounds
(10)
Mohamed_alaa46@yahoo.c
om
I am (Mohamed Alaa)
Postion: Principal Electrical Engineer
Overview
The main goals from this lecture is to know what is the relation
between electrical work and other departments work specially
mechanical department and to know a general information
about that systems basic of operation to know how you can
service them
GENERAL
SYSTEMS
Heating Ventilation Air
Condition (HVAC)
Cooling & Heating
systems
General ventilation
Fire fighting system
Fire scenarios
WATER
PLUMING
GASES
Low Current System
Domestic water supply
FACP
ACP
1-DX systems
1-Basement ventilation:
CO2
Drainage
IP Camera
Analog Camera
2-Chilled water system
2-Kitchen ventilation:
FM200
STP(Sewage Treatment
Plants)
Public Address
IT Rack
3-District cooling
3-Toilet ventilation:
INERGEN Systems
Holding tank application
Irrigation
Special applications
Concept
GENERAL
INFORMATION
ELECRTICAL
REQUIRED
SPECIAL
NOTES
HVAC
1- Cooling & Heating systems
Physical concept:
In order to complete the loop of the refrigerant, it is evaporated in the
evaporator, then compressed to the condenser thus raising its pressure
and temperature to about 50°c, then condensed to liquid in the
condenser, and at last its pressure is decreased back to that of the
evaporator by means of the expansion valve as per the drawing:
Cooling systems
SUPERHEATED STATE
A IR @ 4 0 °C
FREON @ 80°C
LIQUID STATE
FREON @ 50°C
CON DEN SER
E X P A N S IO N V A L V
E
COM PRESSOR
EVAPOR ATOR
A IR @ 1 2 °C
VAPOR STATE
FREON @ 7°C
MIXED STATE
FREON @ 7°C
A IR @ 2 4 °C
1-DX systems
• Applicable for Low rise buildings
1-1 Split units
CIRCUIT
BREAKER
PROTECTION
ON/OFF
SPECIAL REQUIRES: emergency feeding required in
ups rooms and data center
DISCONNECT
SWITCH
MAINTENANCE
1-DX systems
1-2 Package units
1-2 Package units
ELECTRICAL FEEDING
Disconnect Switch
MDB
SMDB
MCC
/CP
1-2 Package units
ELECTRICAL FEEDING
PROTECTION
MAINTENANCE
Disconnect Switch
ON/OFF
MCC
/CP
MDB
SMDB
1-DX systems
1‐3 VRF SYSTEMS
3-VRF OR VRV
Variable Refrigeration Flow
SYSTEM COMPONENTS:
ROOF TOP CONDENSING UNIT
INDOOR UNITS
PIPING
1-3 VRF SYSTEMS
• WIRING DIAGRAM
ELECTRICAL FEEDING
Disconnect Switch
PROTECTION
MAINTENANCE
MDB
SMDB
MCC
/CP
2-Chilled water system
Water used for cooling as it keep its temperature for long distance, there are two types for
electric driven chillers:
A-Electricdriven:
1. Air cooled
2. Water cooled
B-Absorptionchillers
2-Chilled water system
2‐A‐Electric driven:
2-A-Electric driven:
2-A-1-Air cooled
2-Chilled water system
2-A-1-AIR cooled
2-A-1-System components :
Chiller
AHU
FOR LARGE SPACES
ON/OFF
COOLED
WATER
FCU
FOR SMALL
SPACES
RETURN
WATER
COOLED
WATER
W.PUMP
COOLED
WATER
2-Chilled water system
2-A-Electric driven:
MCC
/CP
2-A-Electrical Feeding :
FCU
Disconnect
Switch
Chiller
MDB
W.PUMP
MAINTENAN
CE
ON/OFF
PROTECTIO
N
DB
MDB
AHU
MDB
SMDB
2-Chilled water system
2-A-Electric driven:
2-A-Electric driven:
2-A-2-Water cooled
•Same as air cooled but with additional cooling
tower to increase system efficiency
2-Chilled water system
2-A-2-Water cooled
2-A-System components :
Cooling tower
AHU
FOR LARGE
SPACES
ON/OFF
RETURN
WATER
COOLED
WATER
FCU
FOR SMALL
SPACES
Chiller
W.PUMP
2-Chilled water system
2-A-2-Water cooled
MCC
/CP
2-A-Electrical Feeding :
FCU
Disconnect
Switch
Chiller
MDB
MAINTENAN
CE
W.PUMP
MDB
ON/OFF
PROTECTIO
N
DB
AHU
MDB
SMDB
2-Chilled water system
2-A-2-Water cooled
2-A-Electrical Feeding :
MCC
/CP
MDB
Disconnect
Switch
Cooling tower
3-District cooling
•OVERVIEW
THIS TYPE OF SYSTEMS USUALLY USED FOR MEGA PROJECT AND
ALWAYS HAS ASEPARET SUBSTATION FOR ELECTRICITY FEEDING
AND SOME TIMES THE USED CHILLER IN THAT SYSTEM WORKS ON
MEDUIM VOLTAGE BECAUSE OF IT IS LARG LOAD
3-District cooling
3-System components :
Cooling tower
AHU
FOR LARGE
SPACES
ON/OFF
RETURN
WATER
COOLED
WATER
FCU
FOR SMALL
SPACES
Chiller
W.PUMP
3-District cooling system
3-A-1-MV CHILLER:
3-A-1-Electrical Feeding :
TR (MV/MV)
RMU
MV MCC
(SOFT STARTER)
MV CHILLER
Medium Voltage
Switchgear
3-District cooling system
3-A-2-LV CHILLER:
3-A-2-Electrical Feeding :
RMU
LV CHILLER
MDB
TR (MV/LV)
LV MCC
(SOFT STARTER)
3-District cooling system
3-B-1-MV PUMPS:
3-B-1-Electrical Feeding :
Medium Voltage
Switchgear
TR (MV/MV)
RMU
MV MCC
MV PUMPS
3-District cooling system
3-B-2-LV PUMPS:
3-B-2-Electrical Feeding :
RMU
MDB
TR (MV/LV)
LV MCC
LV PUMPS
3-District cooling system
3-C-Cooling Tower:
2-C-Electrical Feeding :
MCC /CP
MDB
Disconnect
Switch
Cooling tower
3-District cooling system
3-D-CUSTMER LOADS:
3-D-Electrical Feeding :
• All customer loads will be fed as previous
W.PUMP
AHU
FCU
General Ventilation
1-Basement ventilation:
• Jet fans or central through ducts
• Exhaust
• Fresh air
Jet fan
Exhaust fan
Fresh air
Basement ventilation
Electrical Feeding
MCC
/CP
Exhaust fan
DISCONNECT
SWITCH
MAINTENANCE
Fresh air
MDB
ON/OFF
DB
SMDB
Jet fan
DISCONNECT
SWITCH
MAINTENANCE
DB
SMDB
General Ventilation
2-Kitchen ventilation:
• Individual fans or Central through roof top fans
• Exhaust
• Fresh air (Naturally-Forced)
• Air hood
General Ventilation
3-Toilet ventilation:
• Individual fans or Central through roof top fans
• Exhaust
• Fresh air (Naturally-Forced)
Central Exhaust fan
Roof top
Celling Exhaust fan
Wall Exhaust fan
Air grill
3-Toilet ventilation:
Electrical Feeding
Exhaust fan
MCC
/CP
DISCONNECT
SWITCH
MAINTENANCE
Central Exhaust
fan
Roof top
SMDB
ON/OFF
ON/OFF
DB
CIRCUIT
BREAKER
PROTECTION
DB
Junction
box
Celling Exhaust fan
MCC (Motor Control Center)
Methods of Motors Starting :
- DOL
(Direct Online Starters).
- Star Delta Starters (Y/D).
- VSD (Variable Speed Drives).
DOL (Direct Online Starters):
Mostly used for small motors, usually <7.5 kW.
High starting current.
High starting torque (Causing mechanical wear).
Shortest possible starting time.
Compact starter.
Always direct stop.
Cheap solution.
Star Delta Starters (Y/D):
line voltage = root(3) *phase voltage.
line current =phase current.
Star Delta Starters (Y/D):
line voltage = phase voltage.
line current = root(3) * phase current.
Star Delta Starters (Y/D):
Mostly used for medium motors, usually <15 kW.
Low starting current.
Low starting torque (often too low).
Long starting time.
Always direct stop.
Meany devices-Complex wiring.
Double motor Cables.
VSD (Variable Speed Drives):
VSD (Variable Speed Drives):
 Inverters using sine-coded pulse-width-modulation (PWM)
technology.
 The PWM works by first converting the incoming ac power to dc
using a diode n bridge rectifier.
 The voltage is then filtered, smoothed and passed on to the
PWM inverting section.
 The inverter consists of high speed bipolar that control both
voltage and frequency sent to the motor.
 Output voltage is adjusted by changing the width and number
of the voltage pulses while output frequency is varied by
changing the length of the cycle.
Fire scenarios ventilation
Sandwich system:
-A building is divided into a number of smoke zones, each
zone is separated from others by partitions, floors, and
doors that can be closed to inhibit smoke movement.
-Exhaust air of smoked zone : allow for 6 air changes/hr
through centralized exhaust fans & controlled fire damper
for ducts as per fire zones configuration.
-In the event of a fire, pressure difference and airflows
produced by mechanical fans(use same concept)limit the
spread of smoke from the zone where fire is initiated to the
other zones.
-All escaping routes {Lift lobby & Stairs} should be
pressurized to facilitate the evacuation safely.
Fire scenarios ventilation
1-2-Electrical Feeding
Smoke Fan
Pressurized Fan
CP
Emergency feeding
CP
SPECIAL REQUIRES: Cables shall be fire
resistance (CU/MICA/XLPE/LSF0H).
Emergency feeding
Fire Fighting System
Fire fighting system
GENERAL
Oxygen
ISOLATION
The
temperature
of ignition
COOLING
Fire fighting
Fire fighting system
1-WATER system
1-Water system
1-1-System components
•
•
•
•
Electric fire pump
Primary pump (operation)
Secondary pump (stand by)
Jockey pump
Control panel for each pump
Diesel fire pump
jockey fire pump
1-Water system
SPECIAL REQUIRES: Cables shall be fire
resistance (CU/MICA/XLPE/LSF0H).
Electrical Feeding
1-2-TYPE1A
Primary pump (electrical)+Secondary pump (electrical)+Jockey
pump
TR
Electric fire pump
With ATS in CP
GEN
Electric fire pump
With ATS in CP
Important Note:
EMDB Loads of fire pumps
ESMDB shall be not included
in your calculations.
jockey fire pump
1-Water system
SPECIAL REQUIRES: Cables shall be fire
resistance (CU/MICA/XLPE/LSF0H).
Electrical Feeding
1-2-TYPE1B
Primary pump (electrical)+Secondary pump (electrical)+Jockey
pump
Electric fire pump
Without ATS in CP
ATS
ATS
Electric fire pump
Without ATS in CP
Important Note:
EMDB Loads of fire pumps
ESMDB shall be not included
in your calculations.
jockey fire pump
1-Water system
Electrical Feeding
SPECIAL REQUIRES: Cables shall be fire
resistance (CU/MICA/XLPE/LSF0H).
1-2-TYPE2A
Primary pump (electrical)+Secondary pump (Diesel)+Jockey
pump
Electric fire pump
Diesel fire pump
EMDB
ESMDB
jockey fire pump
can be
removed in
this case
IMPORTANT NOTES
• Magnetic release only C.B used for connect between transformer feeding or
generator feeding and fire pump controller and it must be sized to trip
magnetic only in case of reaching locked rotor current for fire pump as
shown:
bus way
Cables
FIRE
PUMP CP
Cables
Tap-off enclosure include Magnetic release only
CB
Or cubic cell panel include Magnetic release only
CB
For more information refer to (NFPA20 CH9)
IMPORTANT NOTES
• A fire pump controller or fire pump power transfer switch , where
provided, shall not be used as a junction box to supply other
equipment, including a pressure maintenance Jockey pump(s)
(NFPA20 (9.7))
• Transfer of Power. Transfer of power to the fire pump controller
between the normal supply and one alternate supply shall take place
within the pump room. (NFPA20 (9.6.4))
• The generator fuel supply capacity shall be sufficient to provide 8
hours of fire pump operation at 100 percent of the rated pump
capacity in addition to the supply required for other demands.
(NFPA20 (9.6.2.3))
• No ground fault interruption means shall be installed in any fire pump
control or power circuit. (NFPA20 (9.1.8.1))
• No arc fault interruption means shall be installed in any fire pump
control or power circuit. (NFPA20 (9.1.8.2))
• In case of using Diesel fire pump emergency power source must be
provided for battery charger
FIRE PUMP (1 ELECTRIC + 1 DIESEL)
G
RMU
MV CABLE
TAP-OFF
CB
CP
BUSWAY
TR
BUSWAY
CU/MICA/XLPE/LSF0H
CB
MDB
NORMAL LOADS
ATS
EMDB
EMERGENCY LOADS
FIRE PUMP (1 ELECTRIC + 1 DIESEL)
G
RMU
MV CABLE
CP
LV CABLES
TR
LV CABLES
ATS
CU/MICA/XLPE/LSF0H
CB
MDB
NORMAL LOADS
EMDB
EMERGENCY LOADS
FIRE PUMP (1 ELECTRIC + 1 ELECTRIC)
G
RMU
MV CABLE
TAP-OFF
CB
CP
TR
BUSWAY
BUSWAY
CU/MICA/XLPE/LSF0H
CB
MDB
NORMAL LOADS
ATS
EMDB
EMERGENCY LOADS
Fire fighting system
1-GAS systems
• GASES (FM200 , CO2 , INERGEN….etc)
EDB
ESMDB
CIRCUIT
BREAKER
PROTECTION
Junction
box
Plumbing System
Plumbing system
1-Domestic water supply
Normal water
WATER
Cable
BOOSTER PUMP
CP
WATER
Earth
leakage
protection
required
Cable
WATER PUMP
(OPERATION+STAND
BY)
MDB
SMDB
MDB
SMDB
Load calculations based on operation pumps
only
Plumbing system
2-Domestic water supply
Hot water
Solar energy Water heater
Water heater
DISCONNECT
SWITCH
MAINTENANCE
CIRCUIT
BREAKER
PROTECTION
DB
Earth
leakage
protectio
n
required
MDB
SMDB
Plumbing system
3-Drainage
Emergency
feeding
must be
provided
EMDB
ESMDB
SUMP
CP
Plumbing system
4-Drainage
STP(Sewage Treatment Plants)
TR (MV/LV)
RMU
MDB
Plumbing system
5-Irrigation
Earth
leakage
protection
required
WATER
CP
Cable
Irrigation WATER
PUMP
Cable
MDB
SMDB
Plumbing system
6-Swimming pool & fountain
Cable
PUMP ROOM
Earth
leakage
protection
required
MDB
SMDB
Low Current System
Low current system
• Low Current Systems
1.
2.
3.
4.
5.
6.
FACP (Fire Alarm Control Panel)
ACP (Access Control Panel)
CCTV System
Public Address System
Audio Visual System
Active and Passive System (IT Racks)
Low current system
Public Address
Analog Camera
FACP
ACP
IP Camera
IT Racks
1-FACP (Fire Alarm Control Panel)
1- Electrical Feeding
Junction box
Circuit Breaker
Protection
EDB
(Emergency Panel)
FACP (Fire Alarm Control Panel)
Electrical Feeding
FACP
Junction
box
EDB
CIRCUIT
BREAKER
PROTECTION
2-ACP (Access Control Panel)
Electrical Feeding
Socket
Junction box
Circuit Breaker
Protection
EDB
2-ACP (Access Control Panel)
Electrical Feeding
Junction
box
EDB
CIRCUIT
BREAKER
PROTECTION
ACP
3-CCTV System
Electrical Feeding
Socket
Circuit Breaker
Protection
UDB
(UPS Panel)
Socket
CCTV System(IP Camera)
Electrical Feeding
CCTV IP RACK
IP
CAMERA
INTERNET
CABLE
CIRCUIT
BREAKER
PROTECTION
UPP
CCTV System(Analog Camera)
Electrical Feeding
CIRCUIT
BREAKER
PROTECTION
UPP
4-Public Address System
Electrical Feeding
Sound source
Mixer
Amplifier
Socket
Circuit Breaker
Protection
Socket
Audio Rack
UDB
(UPS Panel)
Industrial Power
Socket
Speaker
5-Audio Visual System
Electrical Feeding
Socket
Socket
Circuit Breaker
Protection
DB
Industrial Power
Socket
Audio Rack
6-Active and Passive System
(IT Racks)
Electrical Feeding
Socket
Industrial Power
Socket
UDB
(UPS Panel)
Circuit Breaker
Protection
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Thank You !
For any questions don’t hesitate to contact
the coordinators