Halton Rex REP – Passive chilled beam

Halton Rex REP passive chilled beam utilise a modular convector design, allowing easy configuration for exposed installation with a suspended ceiling. Because they have no moving parts, it offers long maintenance intervals with low lifecycle costs, making it a cost-effective solution for long-term building operation. The design can accommodate two heights (100 mm and 300 mm) to meet demands, ensuring optimal performance in spaces with different ceiling configurations and load requirements.

This chilled beam can be configured for single- or multiple-beam control, providing flexibility in zoning and energy management. Its quiet operation makes it ideal for noise-sensitive environments. It can be delivered with a water valve and actuator, providing precise temperature regulation that harnesses energy efficiency, lowering the carbon footprint while enhancing indoor air quality and occupant wellbeing.

Halton Rex REP passive chilled beam operates through natural convection, drawing warm air from the room toward the beam. As the air passes over the heat exchanger, heat is removed and replaced with cooler air, which gently circulates back into the space. The cooling airflow adjusts automatically in response to the heat load in the occupied zone, maintaining stable and comfortable room conditions.

Cooling output is controlled by regulating the flow of chilled water through the heat exchanger, typically managed by a room thermostat and water valve based on temperature demand. Because passive beams utilise elevated chilled water temperatures, they eliminate the risk of condensation (no latent cooling). Hence, they can capitalise on free-cooling opportunities while reducing energy consumption and enhancing system efficiency.

A coil with 1 loop has a connection pipe Ø15 mm and 2 loops has a connection pipe Ø 22 mm.

The Halton Rex REP passive chilled beam is modular convector design, allowing easy configuration for exposed installation with a suspended ceiling. The chilled beam position can be easily adjusted both horizontally and vertically.

When selecting of the chilled beam orientation, the location of the water circuit connections are taken into account.

Each beam is equipped with movable brackets fixed on top of the beam and fixed to the ceiling with expansion anchors and threaded drop rods (8 mm, not included in the delivery).

It is recommended that the brackets be positioned one quarter of the unit length (L/4) away from the ends of the beam with 2 brackets option.

With 3 brackets option, it s recommended position two of them one fifth of the unit length (L/5) away from the ends of the beam. The third bracket is recommended to locate in the middle of beam (L/2).

The exact positions of the brackets are adjusted according to the rod position.​​

A = Chilled beam installed close wall: Distance (X) same as the width of beam or less, airflow mainly in one direction.

B = Chilled beam installed further from walls: Airflow from both directions.

To ensure effective convection, the beam should be installed:

1. Close to the wall (see Fig. 13-A)
   • Distance from the ceiling: Minimum = width of chilled beam x 0.50
   • Distance from the wall: Same as the width of beam or less
2. Further from walls (see Fig.13-B)
   • Distance from the ceiling: Minimum = width of chilled beam x 0.25
   • Distance from the wall: Width of beam or more
   • Airflow from both directions

The following are the standard practices for commissioning the chilled beam:​

1. Fill up and flush the main pipelines

   • This involves filling the system's main water pipelines with clean water and flushing out any debris, air, or contaminants that may be present. It ensures the system starts with clean water and prevents blockages or damage to components.

2. Fill up and vent the beam circuits

   • Fill each chilled beam circuit with water and vent it to remove trapped air. Air pockets can hinder water flow and reduce cooling efficiency, so venting ensures proper circulation.

3. Adjust the flow water temperature set point

   • Set the desired temperature for the water circulating through the system. The temperature set point affects the cooling performance and energy efficiency of the chilled beams.

1. Adjust water flow rates with the balancing valves in all main pipelines to the correct value

   • Balancing valves are used to regulate and equalise water flow across the system. Adjusting them ensures that each part of the system receives the correct flow rate, which is crucial for consistent performance.

2. Adjust water flows in all chilled beams to the correct value

   • Each chilled beam must receive the appropriate water flow to function optimally. This step involves fine-tuning individual beam valves to match design specifications, ensuring uniform cooling across the space.

Key:

No.	Parts
1	Front panel
2	Casing
3	Cooling coil

• Minimal maintenance required: The unit is designed for low maintenance and long-term reliability.
• Cooling coil cleaning: Depending on room conditions and air quality, clean the cooling coils every 3 to 5 years.
• Cleaning the casing: Wipe the outer casing with a damp cloth to remove dust and surface dirt.
• Cleaning the cooling coil: Use a vacuum cleaner to gently remove dust and debris from the coil, avoiding damage to the fins.