ENERGY CONTROL STRATEGY CHILLED WATER SYSTEM
more modern fan coil circuits. The critical loads include live transmission television studios, which rely heavily on the safe and secure delivery of chilled water to ensure uninterrupted transmission on many of the station’s fl agship live programmes. While RTÉ is committed to energy saving,
there is a constant requirement to balance this objective with the primary business function of delivering uninterrupted transmission across its different media platforms. The CHWS forms a vital component in this function. The air conditioning load for the
Television Centre building is met by the AHUs. Cooling is achieved by using fresh air – free cooling – when possible and if free cooling is not available, then a cooling coil is enabled, using chilled water (CHW) supplied by the CHWS.
Key project steps
• Reduction in the CHWS operational hours by introducing more stringent time
• Enhanced BMS strategies, focusing on demand-led engineering, which has the
scheduling for the Television Centre’s AHUs, ultimately reducing the cooling load demand on the CHWS
• Introduction of Modbus interfacing between chillers and existing BMS to
potential for signifi cant energy saving through effi cient operation
maximise the effectiveness of the BMS control strategy. The inclusion of this type of interfacing is expected to broaden the
An example of a chiller used at RTE Television Centre
• Improvement to the operation and effi ciency of the chillers, in particular
scope of control capabilities of the CHWS
the relationship between condensed and evaporator water temperature.
Cooling load energy audit In May 2009, a detailed energy audit of the air conditioning system was conducted and a strategy developed that primarily focused on the implementation of free cooling methodologies for the Television Centre’s
The chilled water systems respond to demands by more critical air handling units quicker than less critical AHUs
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December 2012 CIBSE Journal 31
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