Resumé

Diffuse ceiling ventilation is an innovative ventilation concept where the suspended ceiling serves as an air diffuser to supply fresh air into the room. Due to the large opening area, air is delivered to the room with very low velocity and no fixed direction, therefore the name ‘diffuse’. Compared with conventional ventilation systems (mixing or displacement ventilation), diffuse ceiling ventilation can significantly reduce or even eliminate draught risk in the occupied zone. Moreover, this ventilation system presents a promising opportunity for energy saving, because of the low pressure loss, extended free-cooling period and night cooling potential. The investment cost of this ventilation system is about 5-10% lower than the conventional ones, because the acoustic ceiling could be directly applied as air diffuser and the use of plenum to distribute air reduces the cost of ductwork. There is a growing interest in applying diffuse ceiling ventilation in offices and other commercial buildings because of the benefits from both thermal comfort and energy efficiency aspects.
Although the interest in the diffuse ceiling ventilation is growing recently, the practical experiences are quite limited and the knowledge is not well structured with this system. These become the motivations in developing the design guide. This design guide aims to establish a systematic understanding of diffuse ceiling ventilation and provide assistance in designing of such a system. The guide is targeted at design engineers, architects and manufacturers and the users of diffuse ceiling technology.
The design guide introduces the principle and key characteristics of room air distribution with diffuse ceiling ventilation. It provides an overview of potential benefit and limitations of this technology. The benefits include high thermal comfort, high cooling capacity, energy saving, low investment cost and low noise level; while the limitations include condensation risk and the limit on the room geometry. Furthermore, the crucial design parameters are summarized and their effects on the system performance are discussed. In addition to the stand-alone ventilation system, the integrations of diffuse ceiling ventilation with other HVAC systems are also discussed. Especially, the coupling with the thermally activated building system (TABS) is addressed and the control strategies for optimal operation is proposed. Finally, two case studies demonstrated the application and the deign procedure of the ventilation concept are presented.
OriginalsprogEngelsk
Udgivelses stedAalborg
ForlagDepartment of Civil Engineering, Aalborg University
Antal sider49
ISBN (Trykt)1901-726X
StatusUdgivet - nov. 2016
NavnDCE Technical Reports
Nummer217
ISSN1901-726X

Fingerprint

Ceilings
Ventilation
Air
Diffusers (fluid)
Thermal comfort
Cooling
Energy conservation
Costs
Thermal energy
Energy efficiency
Condensation

Emneord

  • Diffuse ceiling ventilation
  • Design guide
  • Integrated system
  • Thermally activated building systems
  • Thermal comfort
  • Air distribution

Citer dette

Zhang, C., Yu, T., Heiselberg, P. K., Pomianowski, M. Z., & Nielsen, P. V. (2016). Diffuse Ceiling Ventilation: design guide. Aalborg: Department of Civil Engineering, Aalborg University. DCE Technical Reports, Nr. 217
Zhang, Chen ; Yu, Tao ; Heiselberg, Per Kvols ; Pomianowski, Michal Zbigniew ; Nielsen, Peter Vilhelm. / Diffuse Ceiling Ventilation : design guide. Aalborg : Department of Civil Engineering, Aalborg University, 2016. 49 s. (DCE Technical Reports; Nr. 217).
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abstract = "Diffuse ceiling ventilation is an innovative ventilation concept where the suspended ceiling serves as an air diffuser to supply fresh air into the room. Due to the large opening area, air is delivered to the room with very low velocity and no fixed direction, therefore the name ‘diffuse’. Compared with conventional ventilation systems (mixing or displacement ventilation), diffuse ceiling ventilation can significantly reduce or even eliminate draught risk in the occupied zone. Moreover, this ventilation system presents a promising opportunity for energy saving, because of the low pressure loss, extended free-cooling period and night cooling potential. The investment cost of this ventilation system is about 5-10{\%} lower than the conventional ones, because the acoustic ceiling could be directly applied as air diffuser and the use of plenum to distribute air reduces the cost of ductwork. There is a growing interest in applying diffuse ceiling ventilation in offices and other commercial buildings because of the benefits from both thermal comfort and energy efficiency aspects. Although the interest in the diffuse ceiling ventilation is growing recently, the practical experiences are quite limited and the knowledge is not well structured with this system. These become the motivations in developing the design guide. This design guide aims to establish a systematic understanding of diffuse ceiling ventilation and provide assistance in designing of such a system. The guide is targeted at design engineers, architects and manufacturers and the users of diffuse ceiling technology.The design guide introduces the principle and key characteristics of room air distribution with diffuse ceiling ventilation. It provides an overview of potential benefit and limitations of this technology. The benefits include high thermal comfort, high cooling capacity, energy saving, low investment cost and low noise level; while the limitations include condensation risk and the limit on the room geometry. Furthermore, the crucial design parameters are summarized and their effects on the system performance are discussed. In addition to the stand-alone ventilation system, the integrations of diffuse ceiling ventilation with other HVAC systems are also discussed. Especially, the coupling with the thermally activated building system (TABS) is addressed and the control strategies for optimal operation is proposed. Finally, two case studies demonstrated the application and the deign procedure of the ventilation concept are presented.",
keywords = "Diffuse ceiling ventilation, Design guide, Integrated system, Thermally activated building systems, Thermal comfort, Air distribution, Diffuse ceiling ventilation, Design guide, Integrated system, Thermally activated building systems, Thermal comfort, Air distribution",
author = "Chen Zhang and Tao Yu and Heiselberg, {Per Kvols} and Pomianowski, {Michal Zbigniew} and Nielsen, {Peter Vilhelm}",
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Zhang, C, Yu, T, Heiselberg, PK, Pomianowski, MZ & Nielsen, PV 2016, Diffuse Ceiling Ventilation: design guide. DCE Technical Reports, nr. 217, Department of Civil Engineering, Aalborg University, Aalborg.

Diffuse Ceiling Ventilation : design guide. / Zhang, Chen; Yu, Tao; Heiselberg, Per Kvols; Pomianowski, Michal Zbigniew; Nielsen, Peter Vilhelm.

Aalborg : Department of Civil Engineering, Aalborg University, 2016. 49 s. (DCE Technical Reports; Nr. 217).

Publikation: Bog/antologi/afhandling/rapportRapportForskning

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N2 - Diffuse ceiling ventilation is an innovative ventilation concept where the suspended ceiling serves as an air diffuser to supply fresh air into the room. Due to the large opening area, air is delivered to the room with very low velocity and no fixed direction, therefore the name ‘diffuse’. Compared with conventional ventilation systems (mixing or displacement ventilation), diffuse ceiling ventilation can significantly reduce or even eliminate draught risk in the occupied zone. Moreover, this ventilation system presents a promising opportunity for energy saving, because of the low pressure loss, extended free-cooling period and night cooling potential. The investment cost of this ventilation system is about 5-10% lower than the conventional ones, because the acoustic ceiling could be directly applied as air diffuser and the use of plenum to distribute air reduces the cost of ductwork. There is a growing interest in applying diffuse ceiling ventilation in offices and other commercial buildings because of the benefits from both thermal comfort and energy efficiency aspects. Although the interest in the diffuse ceiling ventilation is growing recently, the practical experiences are quite limited and the knowledge is not well structured with this system. These become the motivations in developing the design guide. This design guide aims to establish a systematic understanding of diffuse ceiling ventilation and provide assistance in designing of such a system. The guide is targeted at design engineers, architects and manufacturers and the users of diffuse ceiling technology.The design guide introduces the principle and key characteristics of room air distribution with diffuse ceiling ventilation. It provides an overview of potential benefit and limitations of this technology. The benefits include high thermal comfort, high cooling capacity, energy saving, low investment cost and low noise level; while the limitations include condensation risk and the limit on the room geometry. Furthermore, the crucial design parameters are summarized and their effects on the system performance are discussed. In addition to the stand-alone ventilation system, the integrations of diffuse ceiling ventilation with other HVAC systems are also discussed. Especially, the coupling with the thermally activated building system (TABS) is addressed and the control strategies for optimal operation is proposed. Finally, two case studies demonstrated the application and the deign procedure of the ventilation concept are presented.

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Zhang C, Yu T, Heiselberg PK, Pomianowski MZ, Nielsen PV. Diffuse Ceiling Ventilation: design guide. Aalborg: Department of Civil Engineering, Aalborg University, 2016. 49 s. (DCE Technical Reports; Nr. 217).