Halton Active Chilled Beams
The chilled beam system is an air/water system for high temperature cooling and low-temperature heating that utilises the excellent heat transfer properties of water and provides a good indoor climate energy-efficiently.
Typically, a chilled beam system is realised as a dedicated outdoor air system with sufficient airflow rates to ensure good indoor air quality. Either the system employs a four-pipe system or a separate perimeter heating system is used.
Chilled beam system design
A chilled beam system can be designed to fulfil requirements for sustainable, energy-efficient buildings that provide flexible use of space and a healthy and productive indoor climate. A chilled beam system can realise excellent indoor climate conditions in terms of thermal and acoustic properties throughout wide operation ranges and in many installation scenarios.
Operation of the system
Chilled beam systems are designed to use the dry cooling principle, operating in conditions where condensation is prevented by control applications. Chilled water can be produced by a dedicated chiller or a common chiller for air handling units with a separate, flow-water-temperature-controlled loop for chilled beams. Space temperature control is realised with variable water flow control.
Ventilation using active chilled beams is an efficient mixing ventilation application that results in uniform air quality. Supply air is discharged into the space through linear slots on either both sides or only one side of the chilled beam. Horizontal induction units have grilles for horizontal air supply.
In demand-based ventilation applications, supply air flow can be increased by means of an integrated diffuser without affecting the heat transfer of the chilled beam.
Active chilled beams use the primary air to induce and recirculate the room air through the heat exchanger of the unit, resulting in high cooling capacities and excellent thermal conditions in the space. High-temperature cooling enables the use of free-cooling sources.
Integration of heating into chilled beams is recommended when heating capacity is low enough (150 ... 250 W/m), and the low heat transmission through the windows prevents a down-draught under the window.
Low-temperature heating enables the use of various waste-heat sources. Alternatively to water-circulated heating, electric heating can be integrated in chilled beam units.