Effects of reducing internal heat load on the operation of multi-split type air conditioning system in an office

Sayana Tsushima*, Shuhei Takahashi, Emi Takai, Junta Fujisawa, Shinichi Tanabe, Hiromasa Tanaka, Hisataka Kitora

*Corresponding author for this work

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


    In this study, the internal heat load and operation of an HVAC system were investigated in an office drawing low internal heat load where multi-split type air conditioning system were adopted. Field and questionnaire surveys and an energy consumption analysis were performed. The designed total cooling capacity of the HVAC system was 158 W/m2, relatively small compared to most systems that have had a 200 W/m2 capacity. However, the average load factor was below 30%. Moreover, it was found that the operation of a dedicated outdoor air system had a large influence on the total electric energy consumption in offices practicing internal load reduction, and that the main cause for the operation change was the humidity setting of the system. Introducing air-conditioning systems with an appropriate smaller capacity and a comprehensive energy-saving operation method, rather than partially optimizing each device, would be beneficial in terms of total energy saving.

    Original languageEnglish
    Title of host publicationHealthy Buildings Europe 2017
    PublisherInternational Society of Indoor Air Quality and Climate
    ISBN (Print)9788379472604
    Publication statusPublished - 2017 Jan 1
    EventHealthy Buildings Europe 2017, HB 2017 - Lublin, Poland
    Duration: 2017 Jul 22017 Jul 5


    OtherHealthy Buildings Europe 2017, HB 2017


    • Air conditioning (HVAC) system
    • Energy consumption
    • Heating
    • Low internal heat load office
    • Ventilation

    ASJC Scopus subject areas

    • Civil and Structural Engineering


    Dive into the research topics of 'Effects of reducing internal heat load on the operation of multi-split type air conditioning system in an office'. Together they form a unique fingerprint.

    Cite this