Experimental study of the pressure reset control strategy for energy-efficient fan operation – Part 2: Variable air volume ventilation system with decentralized fans

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Abstract

This paper is the second part of a two-part series which investigates the energy saving potentials in a novel mechanical ventilation system by replacing terminal dampers with decentralized fans. The present study (Part 2) proposes a method to control the main fan as well as the decentralized fans in such a way that the system is balanced for different demand requests. The control method comprises two levels, zone level and system level control, and is based on measuring static pressure in the duct system similar to the energy-efficient control proposed for the conventional ventilation system in Part 1. Two identical experimental mock-ups, one with the dampers and one with the decentralized fans were used in a laboratory environment to evaluate the performance of the novel ventilation system and to compare the two ventilation systems from power use point of view. Experimental results indicate the ability of the proposed method to control the ventilation system with decentralized fans. The measured power use of the two ventilation systems was almost the same for the range of tested total airflow rates, except when the total airflow rate was rather low. Calculations, however, reveal an energy saving potential of around 30% depending on the efficiency of the main fan.

Original languageEnglish
JournalEnergy and Buildings
Volume172
Pages (from-to)249-256
Number of pages8
ISSN0378-7788
DOIs
Publication statusPublished - Aug 2018

Fingerprint

Pressure control
Fans
Ventilation
Air
Energy conservation
Mockups
Level control
Ducts

Keywords

  • Critical zone reset
  • Energy efficient control
  • Pressure reset
  • VAV ventilation system with decentralized fans

Cite this

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title = "Experimental study of the pressure reset control strategy for energy-efficient fan operation – Part 2: Variable air volume ventilation system with decentralized fans",
abstract = "This paper is the second part of a two-part series which investigates the energy saving potentials in a novel mechanical ventilation system by replacing terminal dampers with decentralized fans. The present study (Part 2) proposes a method to control the main fan as well as the decentralized fans in such a way that the system is balanced for different demand requests. The control method comprises two levels, zone level and system level control, and is based on measuring static pressure in the duct system similar to the energy-efficient control proposed for the conventional ventilation system in Part 1. Two identical experimental mock-ups, one with the dampers and one with the decentralized fans were used in a laboratory environment to evaluate the performance of the novel ventilation system and to compare the two ventilation systems from power use point of view. Experimental results indicate the ability of the proposed method to control the ventilation system with decentralized fans. The measured power use of the two ventilation systems was almost the same for the range of tested total airflow rates, except when the total airflow rate was rather low. Calculations, however, reveal an energy saving potential of around 30{\%} depending on the efficiency of the main fan.",
keywords = "Critical zone reset, Energy efficient control, Pressure reset, VAV ventilation system with decentralized fans",
author = "Samira Rahnama and Alireza Afshari and Bergs{\o}e, {Niels Christian} and Sasan Sadrizadeh and G{\"o}ran Hultmark",
year = "2018",
month = "8",
doi = "10.1016/j.enbuild.2018.04.024",
language = "English",
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journal = "Energy and Buildings",
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AU - Rahnama, Samira

AU - Afshari, Alireza

AU - Bergsøe, Niels Christian

AU - Sadrizadeh, Sasan

AU - Hultmark, Göran

PY - 2018/8

Y1 - 2018/8

N2 - This paper is the second part of a two-part series which investigates the energy saving potentials in a novel mechanical ventilation system by replacing terminal dampers with decentralized fans. The present study (Part 2) proposes a method to control the main fan as well as the decentralized fans in such a way that the system is balanced for different demand requests. The control method comprises two levels, zone level and system level control, and is based on measuring static pressure in the duct system similar to the energy-efficient control proposed for the conventional ventilation system in Part 1. Two identical experimental mock-ups, one with the dampers and one with the decentralized fans were used in a laboratory environment to evaluate the performance of the novel ventilation system and to compare the two ventilation systems from power use point of view. Experimental results indicate the ability of the proposed method to control the ventilation system with decentralized fans. The measured power use of the two ventilation systems was almost the same for the range of tested total airflow rates, except when the total airflow rate was rather low. Calculations, however, reveal an energy saving potential of around 30% depending on the efficiency of the main fan.

AB - This paper is the second part of a two-part series which investigates the energy saving potentials in a novel mechanical ventilation system by replacing terminal dampers with decentralized fans. The present study (Part 2) proposes a method to control the main fan as well as the decentralized fans in such a way that the system is balanced for different demand requests. The control method comprises two levels, zone level and system level control, and is based on measuring static pressure in the duct system similar to the energy-efficient control proposed for the conventional ventilation system in Part 1. Two identical experimental mock-ups, one with the dampers and one with the decentralized fans were used in a laboratory environment to evaluate the performance of the novel ventilation system and to compare the two ventilation systems from power use point of view. Experimental results indicate the ability of the proposed method to control the ventilation system with decentralized fans. The measured power use of the two ventilation systems was almost the same for the range of tested total airflow rates, except when the total airflow rate was rather low. Calculations, however, reveal an energy saving potential of around 30% depending on the efficiency of the main fan.

KW - Critical zone reset

KW - Energy efficient control

KW - Pressure reset

KW - VAV ventilation system with decentralized fans

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