scholarly journals Survey of Control Characteristics of Circular Air Dampers in Variable Air Volume Ventilation Systems

2016 ◽  
Vol 96 ◽  
pp. 294-300 ◽  
Author(s):  
Renars Millers ◽  
Uldis Pelite
Keyword(s):  
Variable Air Volume ◽  
Air Volume ◽  
Volume Ventilation ◽  
Ventilation Systems

scholarly journals An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4947
Author(s):  
Nina Szczepanik-Scislo ◽  
Jacek Schnotale
Keyword(s):  
Thermal Comfort ◽  
Ventilation System ◽  
Ansys Fluent ◽  
Variable Air Volume ◽  
Terminal Device ◽  
Air Volume ◽  
Air Supply ◽  
Volume Ventilation ◽  
Ventilation Efficiency ◽  
Comfort Parameters

This study aimed to develop a new concept for an air terminal device for a VAV (variable air volume) ventilation system that would improve overall ventilation efficiency under a varying air supply volume. In VAV systems, air volume is modified according to the thermal load in each ventilated zone. However, lowering the airflow may cause a lack of proper air distribution and lead to the degradation of hygienic conditions. To combat this phenomenon, an air terminal device with an adapting geometry to stabilize the air throw, such that it remains constant despite the changing air volume supplied through the ventilation system, was designed and studied. Simulations that were performed using the RNG k–ε model in the ANSYS Fluent application were later validated on a laboratory stand. The results of the study show that, when using the newly proposed terminal device with an adaptive geometry, it is possible to stabilize the air throw. The thermal comfort parameters such as the PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied) proved that thermal comfort was maintained in a person-occupied area regardless of changing airflow though the ventilation system.

Airflow and Air Quality in a Large Enclosure

1995 ◽  
Vol 117 (2) ◽  
pp. 114-122 ◽  
Author(s):  
Z. Jiang ◽  
Qingyan Chen ◽  
F. Haghighat
Keyword(s):  
Air Quality ◽  
Air Temperature ◽  
Ventilation System ◽  
Shopping Center ◽  
Variable Air Volume ◽  
Air Volume ◽  
Large Enclosure ◽  
Air Temperatures ◽  
Cfd Method ◽  
Ventilation Systems

Knowledge of air flow patterns and thermal parameters are essential in the design of a ventilation system for large enclosures. The objective of this paper is to evaluate the possibility of using computer simulation to predict the airflow pattern and removal effectiveness of ventilation systems in large enclosures. The quality of air and thermal comfort in a three-floor shopping center are studied by the computational fluid dynamics (CFD) method. Two ventilation systems are selected. In System 1, rooms are ventilated by two ceiling slot diffusers, supplying air downward into the rooms. The halls are equipped with wall jet diffusers delivering air in a horizontal direction. Airflow and air quality, under both summer and winter conditions, are investigated. In System 2, the air in each room is supplied in a radial manner by four ceiling rectangular diffusers. The hall and balconies have jet diffusers which supply air vertically downward. Different ventilation rates, outdoor air ratios and supply air temperatures are studied. Occupants are simulated by heat and CO2 sources without aerodynamic blockages. It was found that the summer and winter air temperature differences in the shopping center differ by approximately 2°C. The rectangular air diffusers should he used in the rooms and the jet diffusers in the halls and balconies. Both the variable air volume and the constant air volume methods, with an adjusted supply air temperature, can be used for air conditioning control in a large enclosure.

scholarly journals The Analysis for Energy Consumption of Marine Air Conditioning System Based on VAV and VWV

2018 ◽  
Vol 38 ◽  
pp. 04012
Author(s):  
Sai Feng Xu ◽  
Xing Lin Yang ◽  
Zou Ying Le
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Water Volume ◽  
Pump System ◽  
Air Conditioning System ◽  
Variable Air Volume ◽  
Air Volume ◽  
Marine Air ◽  
Variable Water

For ocean-going vessels sailing in different areas on the sea, the change of external environment factors will cause frequent changes in load, traditional ship air-conditioning system is usually designed with a fixed cooling capacity, this design method causes serious waste of resources. A new type of sea-based air conditioning system is proposed in this paper, which uses the sea-based source heat pump system, combined with variable air volume, variable water technology. The multifunctional cabins’ dynamic loads for a ship navigating in a typical Eurasian route were calculated based on Simulink. The model can predict changes in full voyage load. Based on the simulation model, the effects of variable air volume and variable water volume on the energy consumption of the air-conditioning system are analyzed. The results show that: When the VAV is coupled with the VWV, the energy saving rate is 23.2%. Therefore, the application of variable air volume and variable water technology to marine air conditioning systems can achieve economical and energy saving advantages.

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