Study on the applicability of the Desk Displacement Ventilation concept

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This paper summarizes an experimental and numerical study into a ventilation concept which combines displacement ventilation with task conditioning; the so-called desk displacement ventilation (DDV-) concept. The study uses steady-state and transient results to discuss the applicability of the DDV-concept for standard office room configurations. The evaluation of the concept is focussed on micro/macroclimate and thermal comfort.
The results show that the separation between micro- and macroclimate, a characteristic of task conditioning, is less pronounced. Furthermore, the thermal comfort conditions at the desk limit the cooling capacity of a DDV-system. Finally, the transient characteristics of the concept do not conform to posed requirements for task conditioning systems. The main conclusion therefore is that there is no particular advantage in sitting close to a displacement ventilation unit.
An improvement of the DDV-system is proposed by incorporating a parallel system which provides the fresh air near head level. The improvement of the combined system has been investigated using Computational Fluid Dynamics.
Original languageEnglish
Pages (from-to)759-768
Number of pages11
JournalASHRAE Transactions
Publication statusPublished - 1 Jan 1999
Externally publishedYes


  • ventilation
  • efficiency
  • personal ventilation
  • CFD
  • experimental


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