Halton Vita VPR – Hygienic chilled beam

Application area

• Hospital patient rooms
• Laboratories
• Other spaces with high hygienic requirements

Key features

• Easy and fast selection with Halton eHIT design tool.
• Combined cooling, heating, and supply air unit for flush installation within a suspended ceiling.
• Hygienic and openable construction with smooth surfaces that are easy to clean thoroughlyc.
• Coil with anti-bacterial finishing to prevent eventual microbial growth.
• Hinged coil to enable access to both sides of the coil and internal beam surfaces for cleaning.
• Reduced amount of dust accumulation and less need for specialist cleaning compared to other chilled beams.
• Individually adjustable velocity conditions with Halton Velocity Control (HVC).
• Individually adjustable supply airflow rate for changes in space layout using Halton Air Quality (HAQ) control (optional).

Velocity control in the occupied zone

The Halton Velocity Control (HVC) is used to adjust room air velocity conditions either when the room layout is changed, (e.g., in cases where the chilled beam is located near the partition wall) or when local, alter the individual velocity conditions. The HVC adjustment impacts the induced room airflow through the heat exchanger. Therefore, it either increases or decreases both the velocities in the occupied zone and the cooling/heating capacity of the chilled beam.

The HVC damper is divided into sections (Pos. 1-3) to enable the adjustment of conditions in different parts of the occupied zone.

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.

Airflow rate control

The supply airflow of the chilled beam nozzle jets is dependent on effective length and static chamber pressure, which can be adjusted, e.g., using a separate airflow adjustment damper.

Optional Halton Air Quality Control (HAQ) adjusts and/or controls the outdoor air flow rate in a room. The airflow rate is dependent on the opening position of the control damper and the static chamber pressure.

Airflow rate adjustment is needed when the use of the space is changed and there is a need to adapt the supply airflows. Airflow rate can be adjusted either manually or automatically, on the basis of demand, with a motorised control damper.

A chilled beam equipped with HAQ manual air flow rate adjustment can be retrofitted to a motorised version for demand-based ventilation.

It is recommended that chilled beams for demand based airflows should be connected to constant pressure ductwork zone.

Halton Air Quality Control (HAQ) can operate efficiently in the constant-pressure ductwork zone with the following features:

• The HAQ adjustment has no impact on nozzle jet airflow.
• The HAQ adjustment has no impact on either the coil cooling or heating capacities.
• The HAQ airflow control has no significant impact on ductwork pressure conditions or the airflow rates of other chilled beams in the same ductwork zone.

The constant pressure ductwork zone should be designed based on the maximum/boost airflow rates and the same main ductwork size. It ensures uniform ductwork pressure conditions and correct airflow rates in response to demand.

The appearance of different units with constant, adjustable, or variable airflow is identical. The Halton Air Quality control unit’s position and the selection of chilled beam nozzle size allow adjustment of the primary airflow rate in the space. The separate airflow adjustment damper installed in the duct branch is used for balancing the airflows in the ductwork.

When a motorized air quality control (HAQ) unit is used, the maximum and minimum airflow rates are adjusted with the stroke limiters of the damper.

The primary airflow rate of each beam is adjusted using the HAQ control unit during the installation and commissioning. There is no need to change or plug nozzles of the chilled beam.

Air quality and temperature controls

The room temperature controller regulates the water flow rate to control the chilled beam’s cooling and heating capacities.

Air quality control for a room space can be arranged using, e.g., a CO₂ sensor while separately controlling the room air temperature by regulating the water flow rate.

Alternatively, a temperature sensor can be used for air quality control. In the first sequence, the airflow rate is modulated, and if the temperature exceeds the set point, the water valve starts to open in the second sequence.

In heating mode, it is recommended that the temperature difference between the jet outlet and room air be no greater than 3 °C. The inlet water temperature of the heat exchanger should also be no higher than 35 °C. Optimal heating performance requires an appropriate primary air flow rate. Thus, the air handling unit shall operate during heating periods to ensure proper heating performance.

Integration with suspended ceiling (standard T-profile 600)

Function

• A supply air unit integrated into the chilled beam shall allow the primary airflow rate to be adjusted over a wide range without plugging or changing the nozzles.
• Adjustment of the airflow rate does not affect the induced airflow rate through the coil or the coil cooling or heating capacity when static chamber pressure is kept constant (optional).
• The chilled beam unit equipped with a manually adjustable airflow damper can be retrofitted with a motorised airflow control damper unit.
• The air supply to the room space is bi-directional.

Structure

• The beam with an adjustable airflow rate has one duct connection.
• The front panel is openable from either side in order to allow general maintenance and cleaning.
• The front panel is removable without any special tools.
• The cooling/heating coil is hinged from one end to enable lowering of the coil from the other end, enabling cleaning access to both the bottom and top sides of the coil and to internal surfaces of the chilled beam that are covered with the coil during normal operation.
• Side covers protect the coil edges from damage during cleaning, and a stopping mechanism secures the opening end of the coil to reduce its decay.
• The casing is enclosed, and the pipe connections are covered to prevent air from the ceiling void from ingressing into the room’s airflow.
• The coil is connected to piping with a flexible pipe connection.
• The front panel is fully perforated with round holes with a diameter of 2 mm. The finned cooling/heating coil has a minimum of 5 mm space between the fins.
• The position of the duct connection is changeable without the use of any special tools.
• The pipework’s maximum operation pressure is 1.0 MPa.
• The active chilled beam offers an airflow adjustment damper as an option and a measurement tap for measuring airflow.
• The active chilled beam is 595 mm wide and 195 mm high.
• The active chilled beam has an inlet duct diameter of 125 mm.
• As an option, the pipe connections shall be equipped with quick connections to enable total removal of the coil.

Materials

• The frame, the front, and the side panels are made of galvanised steel plates.
• All visible parts and internal surfaces of the beam casing shall be white and painted to RAL 9003 (20% gloss).
• All pipes are made of copper, and connection pipes with a wall thickness of 0.9-1.0 mm.
• The fins are made of aluminium.
• The coil is thoroughly power-coated with white antibacterial paint.

Packaging and transport

• A removable plastic coating protects active chilled beams and is wrapped individually in plastic.
• The duct connection and pipe ends remain sealed during transport.
• The active chilled beams are identified by labels attached to both the active chilled beam and the plastic packaging.

Replacing Halton Air Quality control (HAQ) from manual to motorised

VPR-S-AQ-L-C; E-SP-TC-CR-QV-CV-CS-CO-ZT