Froude scaling modeling in an Atrium Fire equipped with natural and transient forced ventilation

2019 ◽  
Vol 19 (3) ◽  
pp. 201-223 ◽  
Author(s):  
Mohsen M. Barsim ◽  
Magdy A. Bassily ◽  
Hesham M. El-Batsh ◽  
Yaser A. Rihan ◽  
Magda M. Sherif
Keyword(s):  
Forced Ventilation ◽  
Atrium Fire

scholarly journals Effect of Mechanical Ventilation on Accidental Hydrogen Releases—Large-Scale Experiments

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3008
Author(s):  
Agnieszka W. Lach ◽  
André V. Gaathaug
Keyword(s):  
Mechanical Ventilation ◽  
Mass Flow ◽  
Large Scale ◽  
Ventilation System ◽  
Hydrogen Gas ◽  
Forced Ventilation ◽  
British Standard ◽  
Confined Spaces ◽  
Series Of Experiments ◽  
Rate Limit

This paper presents a series of experiments on the effectiveness of existing mechanical ventilation systems during accidental hydrogen releases in confined spaces, such as underground garages. The purpose was to find the mass flow rate limit, hence the TPRD diameter limit, that will not require a change in the ventilation system. The experiments were performed in a 40 ft ISO container in Norway, and hydrogen gas was used in all experiments. The forced ventilation system was installed with a standard 315 mm diameter outlet. The ventilation parameters during the investigation were British Standard with 10 ACH and British Standard with 6 ACH. The hydrogen releases were obtained through 0.5 mm and 1 mm nozzles from different hydrogen reservoir pressures. Both types of mass flow, constant and blowdown, were included in the experimental matrix. The analysis of the hydrogen concentration of the created hydrogen cloud in the container shows the influence of the forced ventilation on hydrogen releases, together with TPRD diameter and reservoir pressure. The generated experimental data will be used to validate a CFD model in the next step.

Effect of Unglazed Transpired Collector on the Performance of a Polycrystalline Silicon Photovoltaic Module

2006 ◽  
Vol 128 (3) ◽  
pp. 349-353 ◽  
Author(s):  
A. T. Naveed ◽  
E. C. Kang ◽  
E. J. Lee
Keyword(s):  
Polycrystalline Silicon ◽  
Electrical Power ◽  
Heating System ◽  
Photovoltaic Module ◽  
Forced Ventilation ◽  
Pv System ◽  
Pv Module ◽  
Pv Modules ◽  
Typical Day ◽  
Electrical Output

The electrical power generated by a polycrystalline silicon photovoltaic (PV) module mounted on an unglazed transpired solar collector (UTC) has been studied and compared to that of a PV module without UTC for a quantitative analysis of electrical output and its role in reducing the simple payback periods of photovoltaic electrical systems. A 75W polycrystalline silicon PV module was fixed on an UTC in front of the ventilation fan, and effectiveness of cooling by means of the forced ventilation at the rate of 160CFM was monitored. The temperature reduction under forced ventilation was in the range of 3-9°C with a 5% recovery in the electrical output power on a typical day of the month of February 2005. The simulated and measured electrical power outputs are in reasonable agreement with root-mean-square error of 2.40. The life cycle assessment of a hypothetical PV system located at Daejeon, South Korea and consisting of 3kW PV modules fixed on a 50m2 UTC shows that with a possible reduction of 3-9°C in the operating temperatures, the system requires three 75W fewer PV modules. The simple payback period of PV system is reduced from 23yearsto15years when integrated into an UTC air heating system.

Combination of Forced Ventilation and Fogging Systems for Cooling Greenhouses

2003 ◽  
Vol 84 (1) ◽  
pp. 45-55 ◽  
Author(s):  
A. Arbel ◽  
M. Barak ◽  
A. Shklyar
Keyword(s):  
Forced Ventilation

An Assessment of Gases in Oxygen-Deficient Hay Silos and the Effects of Forced Ventilation

2007 ◽  
Vol 13 (1) ◽  
pp. 83-95 ◽  
Author(s):  
G. Kedan ◽  
P. Spielholz ◽  
T. Sjostrom ◽  
B. Trenary ◽  
R. E. Clark
Keyword(s):  
Forced Ventilation

Effect of Top Ventilation on Cooling Characteristics of Passenger Cabin

2021 ◽  
Author(s):  
Suifan Chen ◽  
Zhiwei Meng ◽  
Qipeng Li ◽  
Feng Huang
Keyword(s):  
Cooling Rate ◽  
Minimum Temperature ◽  
Natural Ventilation ◽  
Great Influence ◽  
Two Dimensions ◽  
Cooling Effect ◽  
Forced Ventilation ◽  
Inlet Velocity ◽  
Inlet Angle ◽  
Passenger Cabin

Abstract In order to solve the hot soak effect of car during summer parking, the CFD numerical method was used to simulate the cooling law of passenger cabin under different inlet area, inlet velocity and inlet angle at the top vent. From the two dimensions of cooling rate and cooling effect, the influence of top natural ventilation and top forced ventilation on the cooling characteristics of passenger cabin were studied. The results show that under the condition of top natural ventilation, the cabin can reach thermal balance at about 10 min under different vent area conditions, and the cooling rate is the largest when the vent is fully opened, and the minimum temperature can reach about 45 °C within 4 min, which is 10 °C higher than the ambient temperature. Under forced ventilation, the inlet velocity has a great influence on the cooling rate and cooling effect of cabin. When the inlet angle is 90° and the inlet velocity is 5 m / s, the cooling rate is the largest and the cooling effect is the best.

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