1. Wega & Wega Power chilled beams
Demand control ventilation
Author: Julien Musset
Business: Air Climate Systems
Date: April 2012

2. Needs / requirements in modern offices

3. Comfort and good Indoor Air quality (IAQ)
Low noise level: Landscape offices could be already noisy so the ventilation and air conditionning system must be quiet
Thermal comfort: The people are seated at their offices and must feel comfortable (right temperature, no drafts)
Good indoor air quality: in order to avoid Sick Building Syndrom
Standards to define comfort: ISO 7730, BCO, Ashrae … requirements about fresh air, temperature, hygrometry

4. Flexibility
The layout of the offices can be modified during the time life: changes in the organization, different tenants.
The layout of the offices can be modified between the design phase and the installation.
The people would like to have an “individual” comfort: to be able to set the air conditioning to needs.

5. Demand Control Ventilation (DCV)
Energy savings:
large variation in ventilation requirements (type of buildings, activities and purposes of the room, climatic outdoor conditions, time of the day)
variable occupancy in the offices
CO2 & COV levels control in landscape offices or meeting rooms

6. WEGA family chilled beams
FWG meets market requirements

7. Energy Control System, induction system
Adjustable induction on site
Patented system
6 # positions in Wega and 3 # positions in Wega Power
12# configurations available for selection
Different air distribution available:
One way distribution
Two ways distribution
Asymetric air diffusion
Easy to change the induction rate on site hence the performances
No tool required

8. Motorized Energy Control System (motorized nozzles)
Variable induction to get VAV functionality
Patented system
6 # positions in Wega and 3 # positions in Wega Power
12# configurations available for selection
Actuator controlled by CO2 sensor, temperature sensor or occupancy sensor
0….10V signal
24V power supply
Retrofit available

9. Motor mounting / retrofit
pus
The construction is the same with or without actuator factory fitted
The actuator can be mounted easily for retrofit

10. Motorized Energy Control System, energy savings
For meeting rooms or landscape offices:
at times of heavy demand (increased supply air demand) the chilled beam is switched to boost mode or is increasing the airflow step by step by means of a push-button or CO2 sensor.
For a close office:
In normal operation the beam is set to the chosen air flow setting. If a occupancy sensor or push-button is installed in the room the beam can also be programmed to switch to Energy Saving Mode (ESM), which reduces the supply air flow to a minimum.
Energy saving mode Normal mode Boost mode or VAV mode
6 l/s l/s l/s
The right cooling at the right time

11. Motorized Enegy Control system, Flexibility
Layout with offices, Wega-240
Nominal airflow 25.4 l/s, nozzle 3
Energy saving mode 8.7 l/s, nozzle1
Occupancy sensor
actuator

12. Motorized Enegy Control system, Flexibility
Layout with meeting rooms, Wega-240
Minimum airflow, 8.7 l/s, nozzle 1
Maximum airflow (boost), 69.4 l/s nozzle 6
CO2 sensor
Occupancy sensor
actuator

13. Flow Pattern Control system – Modularity in flexibility
Plastic blades to adjust air diffusion and throw length: 4 # angles, 0°-15°-30°-45°
Modules of 300 mm to get different flow pattern
Adjustable from the room
Manual adjustement, no tool required

14. Same design / Same benefits: FWG meets all the requirements
Wega / Wega Power
You need flexibility, go for the Wega:
6 different inductions available on site to offer wide opportunities of settings
You need capacity, go for the Wega Power:
3 different induction available on site but more cooling capacity than the Wega
Same design / Same benefits: FWG meets all the requirements

15. Wega, coil performances @ 100Pa – 2 pipes
Induction
Waterflow (l/s)
Airflow (l/s)
Water pressure drop (kPa)
Sound LpA
Coil power (W)
IQIF / 1
0,037
5,6
2,79
<20dB
310
IQIF / 2
0,059
11,3
5,87
495
IQIF / 3
0,077
17,7
8,96
24,2
646
IQIF / 4
0,09 25
11,52
28,2
757
IQIF / 5
0,097 31
12,96
30,6
815
IQIF / 6
0,111
46,1
16,03
35,5
932
IQIF /
0,053
8,7
6,04
442
IQIF /
0,082
16,1
12,91
690
IQIF /
0,106
25,2
19,94
25,6
890
IQIF /
0,124
35,2
25,74 30
1034
IQIF /
0,134
43,6
29,54
32,9
1121
IQIF /
0,151
63,3
36,46
39,9
1268
IQIF /
0,069 10
11,88
578
IQIF /
0,105
19,5
25,11
20,4
880
IQIF /
0,138
30,9
40,72
26,1
1154
IQIF /
0,156
44,4
50,98
30,5
1310
IQIF /
0,164
54,2
55,19
33,1
1369
IQIF /
0,181
78,4
66,4
38,8
1519
Nozzle rail 1 / Inlet water: 14°C / Outlet water:16°C / room temperature: 24°C

16. Wega Power, coil performances @ 100Pa – 2 pipes
Induction
Waterflow (l/s)
Airflow (l/s)
Water pressure drop (kPa)
Sound LpA
Coil power (W)
IQIH-180-bb (Nozzle Rail ) 2
0,086
13,7
11,64
<20dB
717
IQIH-180-bb (Nozzle Rail )
0,09 15
12,59
754
IQIH-180-bb (Nozzle Rail )
0,099
18,8
14,69
831
IQIH-180-bb (Nozzle Rail )
0,107
23,6
16,6
897
IQIH-240-bb (Nozzle Rail )
0,118
17,7
26,13
987
IQIH-240-bb (Nozzle Rail )
0,125
19,7
28,89
20,2
1046
IQIH-240-bb (Nozzle Rail )
0,139
25,1
34,69 23
1165
IQIH-240-bb (Nozzle Rail )
0,149
31,4
39,05
25,8
1248
IQIH-300-bb (Nozzle Rail )
0,152
23,2
53,08
1270
IQIH-300-bb (Nozzle Rail )
0,158
25,4
56,99
1322
IQIH-300-bb (Nozzle Rail )
0,17
31,7
65,14
1425
IQIH-300-bb (Nozzle Rail )
0,181
40,1
72,67
21,5
1515
Induction in standard mode / Inlet water: 14°C / Outlet water:16°C / room temperature: 24°C

17. Wega features Coil 8 rows: 2 pipes (8) or 4 pipes (6+2)
Induction rail: 6 different sizes of induction holes available on site
12 # settings available for the selections
FPC
Different height for the plenum box
Different connections locations
Openable front plate for easy maintenance

18. Wega Power features Coil 10 rows: 2 pipes (10) or 4 pipes (8+2)
Induction rail: 3 different sizes of induction holes available on site
12 # settings available for the selections
FPC
Different height for the plenum box
Different connections locations
Openable front plate for easy maintenance

19. Wega / Wega Power, attachments
Easy and fast installation wit the fastening brackets

20. STRA14, control for the DCV

21. Room controller STRA-14 3 or 6 positions controller
Communication via RS485 (Modbus, Bacnet or EXOline)
Easy installation thanks to separate basic plate for cable connections.
4 separate operation positions
Actuators signal: On/Off or V control
Input for occupancy detector, window contact, CO2 sensor, condensation detector
5 different pre-programmed control sequences relevant for chilled beam applications.
Free cooling modthrough the bus

22. 5 modes Unscheduled time mode: Airflow set to minimum
OFF mode, the room controller doesn’t work
Frost preventing function
Unoccupied mode:
Set points are extended
Airflow set to minimum by default and set to position 2 if cooling is required
Stand by mode:
Activated by occupancy sensor
Set points are extended (±3 by default)
If cooling is required, first opening of the valve and then increasing of the airflow
Free cooling is available in this mode

23. 5 modes Occupied mode: Activated by button or occupancy sensor
If cooling capacity isn’t enough with valve then the airflow is increased
Free cooling is available
If CO2 sensor is connected it will override the temperature control of damper output
By pass mode:
This mode is activated by the button from Normal mode.
The air level is set to 6 for a predefined period of time or until the button is pushed.
The room controller regulates the temperature around the heating or cooling temperature set point.

24. 3 positions – Sequences and operation
Sequence for standby, occupied and boost modes
CO2 sensor: adjust the airflow (nozzle position) and forces to the boost mode depending on the C02 measure
Occupancy sensor: forces to the stand-by mode or occupied mode

25. 6 positions - Cooling sequence without free cooling
Output signal
100 %
0 %
48 %
52 %
Cooling 1 %
Cooling 2 %
Airflow level defalut depending on mode
Airlevel 5 (Maximum Airlevel cooling)
Airlevel 4
Airlevel (1 + default air level)
% Cooling demand

26. 6 positions - Cooling sequence with free cooling
Output signal
100 %
0 %
48 %
52 %
Cooling 1 %
Cooling 2 %
Default value of Airlevel
Airlevel 5 (Maximum airlevel cooling)
Airlevel 4
Airlevel (1 + default value)
Cooling demand %

27. 6 positions – Airflow sequence for CO2 level control
A CO2-sensor is required
Output signal
100 %
0 %
Defalut value of Airlevel
Airlevel 6 (Maximum Airlevel CO2)
Airlevel 5
Airlevel (1 + defalut value)
CO2-airflow need demand

28. 6 positions function Airlevel Controller Output Output from Y3 Comment1
0 – 21% 0V
Not adjustable. Only available in Off, Unoccupied and standby 2
22 – 38%
2.2V
Adjustable. Available in unoccupied, standby and occupied 3
39 – 56%
3.9V 4
57 – 74%
5.7V 5
75 – 99%
7.5V 6
100%
10V
Not adjustable. Available in Bypass only, (When called for by CO2-control, also available in occupied)

29. Button functions – 3 & 6 positions

30. System and ductwork design Static pressure control

31. System with constant static pressure control
The system is pressure-dependent:
The airflow through the nozzles depends on the static pressure before the nozzles
If the pressure changes, the airflow is modified.
The static pressure must be constant along all the ductwork.
Constant static pressure

32. Static pressure and total air pressure drop
Static pressure in the main ductwork
Total pressure before the chilled beam =

33. Ductwork design Regain static pressure system:
Same static pressure at the beginning and at the end of the branch
Ductwork has the same sizes along all the branch
Selection of ductwork:
FWG has build the curves to have a quick selection of the sizes ductwork depending on the length of the branch, the air velocity before the branch and the airflow in the branch.

34. Why static regain pressure ductwork?

35. Constant pressure control
The static pressure along the branch must be kept constant. A motorized damper EMPA located at the beginning of the ductwork will ensure this function.
The exhaust ductwork is controlled by a VAV damper EMSS connected to an EMSF measurement flow.
EMSS
EMPA
EMSF
EMPA: pressure controllers
EMSF: flow sensor
EMSS: flow variator

36. Zoning design By façade / exposition By heat loads values per m²
By use / purpose: closed offices, landscape offices, meeting room
1 damper per zone

37. Pressure controlled DCV
Δp controller
AHU
VSD
Constant pressure control damper P

38. Static pressure reset DCV – FWG solution, “optimizer”EQ
AHU
BMS-
system
EMPA/D
VAV damper
Duct pressure
Damper angle
Room
Master
Wega
Chilled Beam
Modbus
Room temp.
CO2
Occupancy
Output
STRA
Room Controler
Functions in Room Master:
Optimizing fan energy
- Optimizing supply air temperature
- Statistics (pressure, room conditions…)
FWG system approach enhance Energy Savings and Efficiency of the system