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VAV Chilled beam
VAV Chilled beam

Halton Rex Exposed VAV (REO) – Chilled beam

Variable air volume chilled beam for Halton Workplace solution.

  • Ideal for application where high quality indoor conditions, energy efficient operation and individual room control are appreciated
  • Suitable for demand based Halton Workplace control system
  •  Enhanced life cycle performance with optimised air and water flow rates

Overview

Halton Rex Exposed VAV chilled beam is:

  • Suitable for demand based Halton Workplace control systems
  • Combined cooling, heating, and supply air unit for exposed installation
  • Well suited for demand based ventilation with constant static pressure ductwork
  • Ideal solution for applications where high-quality indoor conditions, energy efficient operation and individual room control are appreciated

Typical applications: office rooms, landscape offices and meeting rooms.

Halton Rex Exposed VAV chilled beam is designed for high quality office requirements with high flexibility of the airflow adjustability. The Halton Rex Exposed VAV chilled operation will adapt to changes in the use of the space and office layout changes.

  •  Adjustable supply air flow rate changes with Operation Mode Damper (OMD).
  •  Individually adjustable velocity conditions with Halton Velocity Control (HVC).
  •  In-built flexibility for partition wall relocations with Halton Velocity Control.
  •  Demand based ventilation for efficient use of energy in constant-pressure ductwork zone applications.
  •  Enhanced life cycle performance with optimised air and water flow rates

Product models and accessories

  • Model with combined cooling and heating coil
  • Duct cover, integrated control valves and actuators as accessories

Halton chilled beams are certified by Eurovent Certita.

Link to Certification

Dimensions

Connection types, air and water

 Length, L (mm)  1800, +100, …, 3600
 Coil length (mm)  1500, +100, …, 3300

Valves

Material

Part Material Finishing Note
Front panel Pre-painted
galvanised steel
Polyester-painted
white
(RAL 9003 or RAL 9010,
20% gloss)
Special colours available
Polyester-epoxy-painted
Coil covers Pre-painted
galvanised steel
Polyester-painted
white
(RAL 9003 or RAL 9010,
20% gloss)
Special colours available
Polyester-epoxy-painted
End plates Galvanised steel Polyester-painted
white
(RAL 9003 or RAL 9010,
20% gloss)
Special colours available
Polyester-epoxy-painted
Supply air
plenum
Galvanised steel
Brackets Galvanised steel Polyester-epoxy-painted
white (RAL 9003)
Special colours available
Coil pipes Copper
Coil fins Aluminium

Cooling/heating water pipe connections are Cu15/Cu10 with wall thickness of 0.9-1.0 mm fulfilling the requirements of European Standard EN 1057:1996.

The maximum operating pressure for chilled/hot water pipework is 1.0 MPa @ 70 °C.

Accessories

Accessory Code Description Note
Combined cooling
and heating coil
TC = H Coil with hot
water circulation
Cooling/heating
copper
water pipe
connections are
Ø 15/10 mm
Cooling coil
with air bleeder
TC = CV Coil with chilled
water circulation
Cooling copper
water pipe connection
is Ø 15mm
Combined cooling
and  heating coil
with air bleeders
TC = HV Coil with hot and chilled
water circulation
Cooling/heating copper
water pipe connections
are Ø 15/10 mm
 Visual appearance VA=See
Order
code tab
For appearance options see Fig. 1-6 Selected options have the
same performance data
and dimensions.

Visual appearance options (VA)

REO_VA=RO

Fig.1.  Rounded, oval perforation (RO)


Fig.2.  Rounded, round perforation (RR)

REO_VA=AO

Fig.3. Angular, oval perforation (AO)

REO_VA=AR
Fig.4. Angular, round perforation (AR)

REO_VA=SO

Fig.5.  Square with fixed front panel, oval perforation (SO)

REO_VA=SR
Fig.6.  Square with fixed front panel, round perforation (SR)

Function

The Halton Rex Exposed VAV chilled beam is an active chilled beam for exposed installation.

The primary supply air enters the plenum of the active chilled beam, from which it is diffused into the room through nozzles controlled by Operation Mode Damper (OMD). The supply air nozzle jets efficiently induce ambient room air through the heat exchanger, where it is either cooled or heated. The supply air jet is directed horizontally along the ceiling surface. The recommended minimum distance is 600 mm from the wall and 100 mm from the ceiling.


Fig.1. Function of the Halton Rex Exposed VAV beam

Velocity control in the occupied zone

Halton Velocity Control (HVC) is used for adjusting room air velocity conditions either when room layout is changed (e.g., in cases where the chilled beam is located near the partition wall) or when local, individual velocity conditions need to be altered. Halton velocity control adjustment has an impact on the induced room airflow through the heat exchanger, and therefore it either increases or decreases both the velocities in the occupied zone and the cooling/heating capacity of the chilled beam.

Halton Velocity Control involves manual velocity adjustment with three different positions (Fig.1. and 2.): 1 = Throttle, 2 = Normal, and 3 = Boost. The Halton velocity control system is divided into sections to enable the adjustment of conditions in different parts of the occupied zone. Depending on the length of the beam, optimal HVC damper module lengths between 500 and 1400 mm are used.

It is recommended to design the chilled beam in the normal position to allow both throttle and boost functions during the building s life cycle


Pos. 1 = Throttle position      Pos. 2 = Normal position       Pos. 3 = Boost position

Fig.2. Halton Velocity Control (HVC) from side


Pos. 1 = Throttle position  / Pos. 2 = Normal position / Pos. 3 = Boost position

Fig.3. Halton Velocity Control (HVC) from top

Operation mode control

The supply airflow of the chilled beam nozzle jets is dependent on the nozzle type, nozzle row length and static chamber pressure.

The Operation Mode Damper (OMD, green in Fig. 4.) is used for adjusting and controlling the fresh airflow rate in a room space. The airflow rate is dependent on the opening position of the control damper. Operation mode of the room space is monitored with occupancy sensor.


Fig.4.  OMD (green), Chamber 1 (blue) , Chamber 2 (red)

Fig.5. presents the function in different modes controlled by the OMD. In unoccupied mode (1.) the supply airflow rate is set to minimum value that can remove material emission. In occupied mode (2.) supply airflow rate is set to normal office mode. When more persons are coming to the space, based on CO2-sensor airflow is increased to boost mode (3.) to maintain the set target value of the indoor air quality.


1. Unoccupied  mode              2. Occupied  mode              3.  Boost mode 

Fig.5. Supply air modes of the Halton Rex Exposed VAV beam
It is recommended that chilled beams for demand based airflows should be connected to constant pressure ductwork zone.

Temperature controls

The cooling and heating capacities of the chilled beam are controlled by regulating the water flow rate according to the control signal of the room temperature controller.

In heating mode, it is recommended that the temperature difference between the jet outlet and room air would not be greater than 3 °C. The inlet water temperature of the heat exchanger should not be higher than 35 °C. Optimal heating performance requires an appropriate primary airflow rate. Thus, the air handling unit shall be in operation during heating periods to ensure proper heating performance.

Installation

The Halton Rex Exposed VAV unit is suitable for exposed installation in the ceiling, typically lengthwise in the room. It is recommended to position the beam no closer than 600 mm from the wall and 100 mm from the ceiling. The chilled beam ceiling brackets can be fixed directly to the ceiling surface or suspended using threaded drop rods (8 mm). It is recommended that the brackets are positioned one quarter of a unit length (L/4) away from the end of the beam.

Install the main pipelines of the cooling and heating water loops above the level of the chilled beams to enable venting of the pipework.

Installation with brackets


Fig.1. Fixing of the beams done by pushing the beam to the ceiling brackets.
Secure all fixing points so that they are properly locked to the fixing slots.

Adjustment

Cooling

The recommended cooling water mass flow rate is 0.02 … 0.10 kg/s, resulting in a temperature rise of 1 … 4 °C in the heat exchanger. To avoid condensation, the recommended inlet water temperature of the heat exchanger is 14 … 16 °C.

Heating

The recommended heating water mass flow rate is 0.01 … 0.04 kg/s, resulting in a temperature drop of 5 … 15 °C in the heat exchanger. The maximum recommended temperature of the inlet water for the heat exchanger is 35 … 45 °C.

Balancing and control of water flow rates

Balance the water flow rates of the Halton Rex Exposed VAV with adjustment valves installed on back end of the chilled beam. The cooling capacity and heating capacity of the chilled beam are controlled by regulating the water mass flow rate.

When setting the automatically balancing combination valve AB-QM, set the designed water flow rate in the valve body and verify the pressure difference (min.7.5 kPa) between the measurement nipples of the valve. The pressure difference over the valve must be 16 kPa, to ensure proper operation.

The water mass flow rate can be controlled by using an ON/OFF valve or a two- or three-way proportional valve.

Adjustment of supply airflow rate

Connect a manometer in the measurement tap and measure the static pressure in the Halton Rex Exposed VAV chilled beam. The measurement tab locations for OMD and chambers 1 and 2 are presented in Fig.1.


Fig.1. Location of measurement tabs

Key:
1.  Chamber 1    (blue)
2.  OMD            (green)
3.  Chamber 2    (red)
The airflow rate is calculated according to the formula below:

Total airflow rate (qv)

q        Total airflow rate, l/s or m3/h
qv1       Chamber 1 nozzle jet airflow rate, l/s or m3/h
qv2       Chamber 2 nozzle jet airflow rate, l/s or m3/h
Nozzle jet airflow rate for Chamber 1 and 2 (qv1 and qv2)

l eff           Length of the coil [m)
Δpm        Measured static chamber pressure [Pa]

Nozzle k (l/s) k (m3/h)
A 0.71 2.56
B 1,01 3,64
C 1,41 5,08
D 2.08 7,49

Same k factors will be used to all the operation modes.

Please note the leff  may differ between the normal and boost modes.

Servicing

REO_servicing1

Code description:
1.   Front panel
2.   Supply air connection
3.   Chilled water pipe connection
4.   Heating water pipe connection
5.   Control valves and actuators
6.   Controller
7.   Coil cover

Remove the coil covers and front panel of the Halton Rex Exposed VAV. Clean the supply air plenum, duct and finned coils of the heat exchanger using a vacuum cleaner, taking care not to damage the finned coils. Clean the front panel and, if necessary, the side plates with a damp cloth.

Specification

The unit is an active chilled beam for exposed installation with bi-directional air supply.
The front panel is openable and detachable from either side to allow maintenance and cleaning.

The chilled beam is 432 mm wide and 210 mm high, with inlet duct diameter of 160 mm.

The chilled beam can be equipped with a duct cover to cover the connection duct and pipe installations (optional).

The front panel and side panels are made of pre-painted galvanised steel plate (white, RAL 9003).
All visible parts can be painted with special colours (RAL xxxx).

The primary airflow rate is adjustable from minimum to maximum (0-100%)
when static chamber pressure is kept constant.
The chilled beam unit is equipped with a motorised Operation Mode Damper (OMD).

The induced room airflow rate is manually adjustable to three positions without influencing the primary air supply flow rate.

All pipes are manufactured from copper, connection pipes with a wall thickness of 0.9-1.0 mm.
The fins of the heat exchanger are manufactured from aluminium.
Heating is incorporated within the heat exchanger via two 10 mm pipes connected in series. All joints are factory pressure-tested.

The maximum operating pressure of the pipework is 1.0 MPa @ 70 °C.
Each chilled beam is protected by removable plastic coating.
Duct connection and pipe ends are sealed for transit.
Each chilled beam is identifiable by a serial number printed on a label attached to the chilled beam.

Order Code

REO/S-L-P-D, TC-VA-CO-ZT

S = Nozzle type (1st row)
A        A  (Ø3mm)
B        B  (Ø4mm)
C        C  (Ø5mm)
D        D  (Ø6mm)

L = Total length
1800, +100,..,3600

P = Nozzle type  (2nd row)
A        A  (Ø3mm)
B        B  (Ø4mm)
C        C  (Ø5mm)
D        D  (Ø6mm)

D = Nozzle length (2nd row)
1200, +100,..,3300

Other options and accessories

TC = Cooling / Heating functions (coil type)
C           Cooling
H           Cooling and Heating
CV         Cooling, with venting valves
HV         Cooling and heating, with venting valves

VA = Visual appearance
RO         Rounded, oval perforation
RR         Rounded, round perforation
AO         Angular, oval perforation
AR         Angular, round perforation
SO         Square with fixed front panel, oval perforation
SR         Square with fixed front panel, round perforation

CO = Colour
SW       Signal white (RAL 9003)
W         Pure white (RAL 9010)
X           Special colour (RAL xxxx)

ZT = Tailored product
N             No
Y             Yes (ETO)

Code example

REO-A-3000-B-2700, TC=C, VA=SO, CO=SW, ZT=N

Downloads

Halton Rex Exposed VAV (REO) – Chilled beam
Data
en
Halton Rex Exposed VAV (REO) – Poutre active VAV
Data
fr
Eurovent Certification for Chilled Beams
Certificate
en_GB
160.22 KB
  • Max. file size: 128 MB.

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