Ceiling-mounted personalized ventilation system integrated with a secondary air distribution system - a human response study in hot and humid climate

Indoor Air ◽  
2010 ◽  
Vol 20 (4) ◽  
pp. 309-319 ◽  
Author(s):  
B. Yang ◽  
S. C. Sekhar ◽  
A. K. Melikov
Keyword(s):  
Distribution System ◽  
Ventilation System ◽  
Air Distribution ◽  
Human Response ◽  
Humid Climate ◽  
System A ◽  
Hot And Humid Climate ◽  
Secondary Air ◽  
Personalized Ventilation

scholarly journals Operation Testing of an Advanced Personalized Ventilation System

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1596 ◽  
Author(s):  
Csáky ◽  
Kalmár ◽  
Kalmár
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Distribution System ◽  
Noise Level ◽  
Background Noise ◽  
Ventilation System ◽  
Air Distribution ◽  
Personalized Ventilation

Using personalized ventilation systems in office buildings, important energy saving might be obtained, which may improve the indoor air quality and thermal comfort sensation of occupants at the same time. In this paper, the operation testing results of an advanced personalized ventilation system are presented. Eleven different air terminal devices were analyzed. Based on the obtained air velocities and turbulence intensities, one was chosen to perform thermal comfort experiments with subjects. It was shown that, in the case of elevated indoor temperatures, the thermal comfort sensation can be improved considerably. A series of measurements were carried out in order to determine the background noise level and the noise generated by the personalized ventilation system. It was shown that further developments of the air distribution system are needed.

Energy Use Comparison of Air Distribution Systems Serving a Section of a School Building

2012 ◽  
Author(s):  
Stillman Jordan ◽  
Randall D. Manteufel
Keyword(s):  
Total Energy ◽  
Distribution System ◽  
Energy Recovery ◽  
Distribution Systems ◽  
Energy Savings ◽  
Ventilation System ◽  
Space Distribution ◽  
Air Distribution ◽  
Displacement Ventilation ◽  
Humid Climate

An optimal air distribution design accomplishes both comfort and ventilation requirements while consuming as little energy as possible. This paper analyzes four different air distribution systems and technologies including single duct variable air volume air handlers, chilled beam cooling systems, total energy recovery wheels, displacement ventilation, and dedicated outside air systems; in an effort to determine the best air distribution system for a representative section of a school in hot and humid climate. The effectiveness of the air distribution systems is evaluated by analyzing how the different technologies take advantage of the natural convective properties of air to create a comfortable environment for the occupied region of the space. Distribution effectiveness and energy consumption must be weighed against considerations such as system complexity and ease of operation. This paper compares several alternative air distribution systems to a baseline single inlet VAV system that is commonly used in new schools designed today. Calculations show that the total energy recovery wheels result in a 16% energy savings over the baseline air distribution system because of the large amount of outside air required in school buildings. Chilled beams are not well suited for schools because of the large amount of outside air required by the space and the sophisticated design and operation needed to prevent condensation from occurring at the chilled beam. The results show that the air distribution system that consumes the least amount of energy is a displacement ventilation system. The system also inherently promotes better indoor air quality as it allows air to naturally rise out and return out of the space with minimal mixing of contaminates that may be recirculated within the room for others to breath. The displacement ventilation system’s overall energy savings of 20% over the baseline is mainly attributed to its total energy recovery wheel and the system’s ability to drastically reduce the cooling load seen by the air cooled chiller by effectively ventilating spaces using less outside air.

Findings of Personalized Ventilation Studies in a Hot and Humid Climate

2005 ◽  
Vol 11 (4) ◽  
pp. 603-620 ◽  
Author(s):  
S. C. Sekhar ◽  
N. Gong ◽  
K. W. Tham ◽  
K. W. Cheong ◽  
A. K. Melikov ◽  
...  
Keyword(s):  
Humid Climate ◽  
Hot And Humid Climate ◽  
Personalized Ventilation ◽  
Ventilation Studies

scholarly journals Ventilation of engine rooms in diesel engines ships

2020 ◽  
Vol 43 ◽  
pp. 69-78
Author(s):  
Victor Mihai ◽  
Liliana Rusu ◽  
Adrian Presura
Keyword(s):  
Pressure Drop ◽  
Diesel Engines ◽  
Distribution System ◽  
High Efficiency ◽  
Ventilation System ◽  
Air Distribution ◽  
Cooling Air ◽  
Principal Design

"Engines room are equipped with a ventilation system which should provide fresh air for combustion and for removing the heat radiated by main engines, auxiliary engines, boilers, generators and other hot equipment installed in compartment. The paper presents the main requirements, recommendations and challenges regarding designing and construction of the ventilation system. The principal design aspects highlighted in this material are related to reducing the pressure drop across the distribution system to reduce the energy used by the fan to blow the air inside the room and to identify the best arrangement of air distribution inlet/outlet in order to get high efficiency of the cooling air."

A Study on the Improvement of ADPI and Ventilation Effectiveness in a Small Theater

2016 ◽  
Vol 24 (03) ◽  
pp. 1650019
Author(s):  
Yong-Il Kwon
Keyword(s):  
Distribution System ◽  
Volume Flow Rate ◽  
Ventilation System ◽  
Air Distribution ◽  
Air Exchange Rate ◽  
Downward Displacement ◽  
Upward Displacement ◽  
Ventilation Effectiveness ◽  
Displacement System ◽  
Selection Of

In the air distribution design of a small theater, either a downward or an upward displacement ventilation is applied generally. The cool air is supplied from openings distributed over the ceiling and extracted beneath the seats for the downward flow and supplied from beneath the seats and extracted from the ceiling for the upward flow system. By the change of air exchange rate (ACH) produced by two divergent ventilation systems inside theater, thermal comfort and ventilation effectiveness around the seats show a different phenomenon. Thereby, it can be seen that the selection of the ventilation system is a significant factor in energy saving. CFD calculations for this study were performed to investigate the effects of various parameters (ADPI and ACE) of air distribution system applied in order to save the cooling energy. This paper focuses mainly on the effect of the varied volume flow rate depending on the ventilation system. The ventilation performances of the downward displacement system are compared quantitatively with the upward displacement system using the concept of the LMA of fresh air.

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