The effect of free-cooling and demand-based ventilation on energy consumption of self-regulating and traditional chilled beam systems in cold climate

Risto Kosonen*, Jani Penttinen, Panu Mustakallio

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionProfessional

    Abstract

    This paper presents the energy saving potential of free cooling and demand-based ventilation with chilled beam system. In the analysis, there are two beam concepts: standard chilled and a self-regulating chilled beam systems. Instead of a traditional four pipe configuration, the self-regulating chilled beam system comprises of a two pipe system, allowing it to utilize high temperature water for cooling and low temperature water for heating, respectively. In self-regulating system, there is no need for regulation valve for beam: the inlet water temperature is close room air temperature (20-22°C) and the room air temperature is allowed to vary between 21-25°C depending on the load conditions. The free cooling for the inlet water is provided by the preheat coil of the air handling unit. The introduction of demand-based ventilation further increases the energy efficiency of the FIVAC system. Energy consumption of the robust self-regulating system is slightly higher than with traditional chilled beam system because self-regulating system is able to keep the room air temperature lower than with traditional beam system. With free-cooling, it is possible to save about 15% of the delivered energy. With the occupancy ration of 60%, energy consumption is reduced 36% with demand-based ventilation. When both free-cooling and demand-based ventilation are used with 60% occupancy ratio, the energy consumption is 44% lower than with traditional system.

    Original languageEnglish
    Title of host publicationVentilation 2015 - Proceedings of the 11th International Conference on Industrial Ventilation
    Pages469-475
    Number of pages7
    Volume1
    Publication statusPublished - 2015
    MoE publication typeD3 Professional conference proceedings
    EventInternational Conference on Industrial Ventilation - Tongji University, Shanghai, China
    Duration: 26 Oct 201528 Oct 2015
    Conference number: 11
    http://www.ventilation2015.org/

    Conference

    ConferenceInternational Conference on Industrial Ventilation
    Abbreviated titleVentilation 2015
    CountryChina
    CityShanghai
    Period26/10/201528/10/2015
    Internet address

    Keywords

    • Chilled beam
    • Demand based ventilation
    • Free cooling
    • Office
    • Self regulating

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