125963076 9 training hvac ventilation
Post on 03-Apr-2018
251 Views
Preview:
TRANSCRIPT
-
7/29/2019 125963076 9 Training HVAC Ventilation
1/14
HVAC
Air Handling & Air Conditioning
-
7/29/2019 125963076 9 Training HVAC Ventilation
2/14
Schneider Electric 2- Division - Name Date
Agenda
Introduction to VentilationSingle and Double Flow Ventilation Systems
Constant and Variable Air Volume Systems
Air Handling Units
Energy Savings OpportunitiesEnergy Recovery Devices
Air Flow Rate Variation
Case Study
-
7/29/2019 125963076 9 Training HVAC Ventilation
3/14
Schneider Electric 3- Division - Name Date
Ventilation
Single flow ventilationOne flow (either extraction orblowing) is forced mechanically
with fans into the building
Extracted Air
Make up
Air
Make up
Air
Double flow ventilationExtracted and make up air areforced mechanically with fans
Extracted Air
Make up Air
-
7/29/2019 125963076 9 Training HVAC Ventilation
4/14
Schneider Electric 4- Division - Name Date
Ventilation
Constant Air Volume Systems (CAV)(Example of a single flow system)
Variable Air Volume Systems (VAV)(Example of double flow system)
Make up
Air
Make
up Air
Supplied
air
Recycled
air
Extracted
Air
A way to reduce consumption by adjusting theflow rate to occupancies and needs
Designed for the most critical configuration, ieHigh fan consumption all the time
-
7/29/2019 125963076 9 Training HVAC Ventilation
5/14
Schneider Electric 5- Division - Name Date
Air Handling Units : Main Components
Air Handling Unit (Example for a single flow ventilation system) 1 : Mixing box
2 : Filter
3 : Hot Heat exchanger (Pre-Heating)
4 : Cool Heat exchanger 5 : Hot Heat exchanger (Re-Heating)
6 : Humidifier
7 : Fan
Recycled Air
Make up Air
Supply air
blown into the
building
-
7/29/2019 125963076 9 Training HVAC Ventilation
6/14
Schneider Electric 6- Division - Name Date
Air Handling Unit (Example for a double flow ventilation system) 1 : Economizing Mixing box
Air Handling Units : Main Components
Recycled
Air
Makeup Air
Supply air
blown into thebuilding
Extracted
Air
Air extracted
from the
building
1
-
7/29/2019 125963076 9 Training HVAC Ventilation
7/14Schneider Electric 7- Division - Name Date
Agenda
Introduction to VentilationSingle and Double Flow Ventilation Systems
Constant and Variable Air Volume Systems
Air Handling Units
Energy Savings OpportunitiesEnergy Recovery Devices
Air Flow Rate Variation
Case Study
-
7/29/2019 125963076 9 Training HVAC Ventilation
8/14Schneider Electric 8- Division - Name Date
Energy Recovery
Principle
Without Energy Recovery With Energy Recovery
-
7/29/2019 125963076 9 Training HVAC Ventilation
9/14Schneider Electric 9- Division - Name Date
Energy Recovery
Different types of system
2 Heat Exchanger Systems
Tube in Shell Exchanger
Supply air
blown into the
building
Make
up Air
Extracted
Air
Air extracted
from the
building
Extracted
Air
Make
up Air
Supply air
blown into the
building
Air extracted
from the
building
-
7/29/2019 125963076 9 Training HVAC Ventilation
10/14Schneider Electric 10- Division - Name Date
Energy RecoveryDifferent types of system
Heat Pipes
Rotary Exchanger
Condens
ation
Ev
aporation
Air extracted from
the building
Make up
Air
Vapor
Liquid
Motor
Purge Zone
Belt
Air extracted
from the building
Purge
Zone
-
7/29/2019 125963076 9 Training HVAC Ventilation
11/14
Schneider Electric 11- Division - Name Date
Energy Recovery
Different types of systemRecycle extracted air
Extracted
Air
Make
up Air
Motorized
dampers
-
7/29/2019 125963076 9 Training HVAC Ventilation
12/14
Schneider Electric 12- Division - Name Date
Principle :The air flow rate varies between the minimum required for health of
occupants and the maximum that can be deliver in order to reach the most
critical conditions
=> Minimum Fan and Heating/Cooling Consumption
Interest compared to a constant flow rate :
Air transportation in Constant flow system often counts for20 to 40% of theinstallation operating costs.
Appropriated for the use of Free Energies :
=> In Summer : Use fresh outside air for free-cooling
How :Dampers / Valves
Bypass
Pre-rotating blades / Variable Pitch
VSD
Air Flow Rate Variation
-
7/29/2019 125963076 9 Training HVAC Ventilation
13/14
Schneider Electric 13- Division - Name Date
Example :
Air Flow Rate Variation and Regulation
Extracted
Air
Make up
Air
Motorized
dampers
Make up Air
settings
Settings
Hot
valvesopening
Ambient
temperature
Minimum
Make-up air
flow rate
P
Difference in Pressure
Controller
P
-
7/29/2019 125963076 9 Training HVAC Ventilation
14/14
Schneider Electric 14- Division - Name Date
Case Study :
One Schneider plant in PolandDouble Flow Ventilation System on one workshop
Heating perform with :Hot water exchangers in the AHU
Radiators
Running all the time 49 weeks/year
Electricity price : 0.49 PLN/kWh ( 1 = 4.45 PLN)
Air Supply side :
Fan motor : P=22 kW, =89 During the week : 2*8 full occupation
1*8, 70% occupation rate Week-end : no activity VSD could be implemented
top related