Wega & Wega Power chilled beams

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Presentation transcript:

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

Needs / requirements in modern offices

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

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.

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

WEGA family chilled beams FWG meets market requirements

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

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

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

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 18-20-22-24 l/s 60 l/s The right cooling at the right time

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

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

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

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

Wega, coil performances @ 100Pa – 2 pipes Induction Waterflow (l/s) Airflow (l/s) Water pressure drop (kPa) Sound LpA Coil power (W) IQIF-180-11/13-01-01-2 1+1 1 0,037 5,6 2,79 <20dB 310 IQIF-180-11/13-01-01-2 2+2 2 0,059 11,3 5,87 495 IQIF-180-11/13-01-01-2 3+3 3 0,077 17,7 8,96 24,2 646 IQIF-180-11/13-01-01-2 4+4 4 0,09 25 11,52 28,2 757 IQIF-180-11/13-01-01-2 5+5 5 0,097 31 12,96 30,6 815 IQIF-180-11/13-01-01-2 6+6 6 0,111 46,1 16,03 35,5 932 IQIF-240-11/13-01-01-2 1+1 0,053 8,7 6,04 442 IQIF-240-11/13-01-01-2 2+2 0,082 16,1 12,91 690 IQIF-240-11/13-01-01-2 3+3 0,106 25,2 19,94 25,6 890 IQIF-240-11/13-01-01-2 4+4 0,124 35,2 25,74 30 1034 IQIF-240-11/13-01-01-2 5+5 0,134 43,6 29,54 32,9 1121 IQIF-240-11/13-01-01-2 6+6 0,151 63,3 36,46 39,9 1268 IQIF-300-11/13-01-01-2 1+1 0,069 10 11,88 578 IQIF-300-11/13-01-01-2 2+2 0,105 19,5 25,11 20,4 880 IQIF-300-11/13-01-01-2 3+3 0,138 30,9 40,72 26,1 1154 IQIF-300-11/13-01-01-2 4+4 0,156 44,4 50,98 30,5 1310 IQIF-300-11/13-01-01-2 5+5 0,164 54,2 55,19 33,1 1369 IQIF-300-11/13-01-01-2 6+6 0,181 78,4 66,4 38,8 1519 Nozzle rail 1 / Inlet water: 14°C / Outlet water:16°C / room temperature: 24°C

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-01-01-2 (Nozzle Rail 1 2+2) 2 0,086 13,7 11,64 <20dB 717 IQIH-180-bb-01-03-2 (Nozzle Rail 2 2+2) 0,09 15 12,59 754 IQIH-180-bb-01-05-2 (Nozzle Rail 3 2+2) 0,099 18,8 14,69 831 IQIH-180-bb-01-07-2 (Nozzle Rail 4 2+2) 0,107 23,6 16,6 897 IQIH-240-bb-01-01-2 (Nozzle Rail 1 2+2) 0,118 17,7 26,13 987 IQIH-240-bb-01-03-2 (Nozzle Rail 2 2+2) 0,125 19,7 28,89 20,2 1046 IQIH-240-bb-01-05-2 (Nozzle Rail 3 2+2) 0,139 25,1 34,69 23 1165 IQIH-240-bb-01-07-2 (Nozzle Rail 4 2+2) 0,149 31,4 39,05 25,8 1248 IQIH-300-bb-01-01-2 (Nozzle Rail 1 2+2) 0,152 23,2 53,08 1270 IQIH-300-bb-01-03-2 (Nozzle Rail 2 2+2) 0,158 25,4 56,99 1322 IQIH-300-bb-01-05-2 (Nozzle Rail 3 2+2) 0,17 31,7 65,14 1425 IQIH-300-bb-01-07-2 (Nozzle Rail 4 2+2) 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

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

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

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

STRA14, control for the DCV

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 0...10 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

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

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.

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

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

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 %

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

6 positions function Airlevel Controller Output Output from Y3 Comment 1 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)

Button functions – 3 & 6 positions

System and ductwork design Static pressure control

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

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

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.

Why static regain pressure ductwork?

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

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

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

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