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, Shin Ichi Tanabe, Hiromasa Tanaka, Hisataka Kitora

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
Externally publishedYes
EventHealthy Buildings Europe 2017, HB 2017 - Lublin, Poland
Duration: 2017 Jul 22017 Jul 5

Publication series

NameHealthy Buildings Europe 2017


ConferenceHealthy 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


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