Efficiency of a Hot Air Curtain Provided by Fan-Shaped Holes for Anti-Icing Systems of Aircraft and Their Engines

2021 ◽  
Vol 64 (3) ◽  
pp. 511-517
Author(s):  
E. Yu. Marchukov ◽  
A. V. Starodumov ◽  
A. V. Il’inkov ◽  
A. V. Shchukin ◽  
V. V. Takmovtsev
Keyword(s):  
Air Curtain ◽  
Hot Air

scholarly journals Effect of Roof Cooling and Air Curtain Gates on Thermal and Wind Conditions in Stadiums for Hot Climates

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3941
Author(s):  
Fangliang Zhong ◽  
Hassam Nasarullah Chaudhry ◽  
John Kaiser Calautit
Keyword(s):  
Energy Consumption ◽  
Electric Energy ◽  
Building Energy ◽  
Future Research ◽  
World Cup ◽  
Air Curtain ◽  
Hot Air ◽  
Computational Fluid Dynamics Cfd ◽  
Energy Consumptions ◽  
The Spectator

To host the 2022 FIFA World Cup, Qatar is facing the greatest challenge in balancing the energy consumptions for cooling the stadiums and the thermal comfort for both players and spectators. Previous studies have not considered using a combined configuration of air curtain and roof cooling supply slot in stadiums to prevent the infiltration of outside hot air and reduce the cooling system’s energy consumption. This paper presents a Computational Fluid Dynamics (CFD) study of thermal and wind modeling around a baseline stadium and simulates the cooling scenarios of air curtains and roof cooling along with the energy consumption estimations for the World Cup matches using Building Energy Simulation (BES). Sensitivity analysis of different supply speeds and supply temperatures of air curtain gates and roof cooling was carried out, and the results showed that scenario six, which provides supply air of 25 m/s and 20 m/s at the roof and air curtain gates with a supply temperature of 10 °C, demonstrates optimal thermal performances on both the spectator tiers and the pitch. Compared with the baseline stadium performance, the average reductions in temperature on the pitch and spectator tiers under scenario six could reach 15 °C and 14.6 °C. The reductions in the Predicted Percentage of Dissatisfied values for the upper and lower tiers as well as the pitch were 63%, 74%, and 78%. In terms of the estimated energy consumptions, scenario six would consume electric energy per match at a rate of 25.5 MWh compared with 22.8 MWh for one of the stadiums in the 2010 South Africa World Cup and 42.0 MWh for the 2006 Germany World Cup. Future research is recommended to explore the influence of supply angle on air curtain gates and roof cooling supply slots’ performances.

CFD Simulation of Insulation Performance of Air Curtain Used in the Cold Store

2013 ◽  
Vol 404 ◽  
pp. 425-431
Author(s):  
Chen Miao ◽  
Jing Xie ◽  
Zhi Li Gao ◽  
Zi Zhen Du ◽  
Jin Lin Zhu
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Flow Distribution ◽  
Simulation Accuracy ◽  
Air Curtain ◽  
Hot Air ◽  
Cold Store ◽  
Simulation And Experiment ◽  
The Times ◽  
Insulation Performance

In order to realize the optimization of insulation performance of air curtain used in the cold store. The unsteady state simulation of the flow field of air curtain used in the cold store was studied by the CFD software to predict variation of the flow field in the cold store after door and air curtain were opened and the time of the flow field of the cold store arriving to be uniform. The experimental verification was also taken. The simulation results reflected that the temperature of the upper area closing to the door increased first and then decreased, then increased. The intrusive hot air destroyed the original uniform air flow distribution and caused the formation of the swirling eddy. When the whole flow field of the cold store was uniform, the swirling eddy disappeared. The re-circulation moved forward the lower left side of the cold store, which was caused by the intrusive hot air. Local mesh refinement could improve the simulation accuracy and be useful to analyse the flow characteristic of the air curtain. The times of the flow field in the cold store arriving to be uniform predicted by the numerical simulation and experiment after door and air curtain being opened were 5 min and 6 min, respectively. This study will provide useful references for optimization of insulation performance of air curtain.

scholarly journals THEORETICAL RESEARCH OF THE INTERNAL GAS DYNAMICS PROCESSES OF MEASUREMENTS OF HOT AIR CURTAIN WITH CROSS-FLOW FAN

2020 ◽  
Vol 2020 (2) ◽  
pp. 3966-3972
Author(s):  
Maria R. Koroleva ◽  
Olga V. Mischenkova ◽  
Michal Kelemen ◽  
Alena A. Chernova
Keyword(s):  
Gas Dynamics ◽  
Cross Flow ◽  
Theoretical Research ◽  
Air Curtain ◽  
Hot Air ◽  
Cross Flow Fan

The Numerical Simulation and Research and Application of Energy-Saving Effect of Hot Air Curtain Jet Velocity of the Dining Room

2014 ◽  
Vol 919-921 ◽  
pp. 1744-1747
Author(s):  
Kun Ru Ma ◽  
Xin Wang
Keyword(s):  
Numerical Simulation ◽  
Energy Saving ◽  
Physical Model ◽  
Outdoor Air ◽  
Air Curtain ◽  
Hot Air ◽  
Jet Velocity ◽  
Dining Room ◽  
Set Up ◽  
Saving Effect

There are often people and goods in and out of the dinning room door, so the door is often open. Heating and air conditioning construction to save energy and to prevent the outdoor air form influencing on indoor environment, set up the air curtain at the entrance of the dinning room to stop outdoor air, the frequently-used air curtain is beam type of air curtain.The project in view of the dinning room of the new campus of hebei university of science and technology, sets up air curtain physical model of the ground floor dining room door at the first area, and carry on reasonable simplification, make sure the numerical simulation calculation area and the sealing condition of air curtain. Then set up physical model for wind pressure, multiply of hot pressure and the local hot pressure at the dinning room door of the air curtain air flow in CFD method. Through the numerical simulation for different jet velocity of the hot air curtain, analysis the temperature field, velocity field, heat loss,heat load parameter, etc. and demonstrate the energy saving effect, and provide reference basis for the selection of air curtain.

A ‘hot air curtain’ for heating an ambulance

Resuscitation ◽  
1974 ◽  
Vol 3 (2) ◽  
pp. 151-153
Author(s):  
R. Snook
Keyword(s):  
Air Curtain ◽  
Hot Air

scholarly journals Experimental and Numerical Studies of Air Curtains for Falling Particle Receivers

2014 ◽  
Author(s):  
Clifford K. Ho ◽  
Joshua M. Christian ◽  
Adam C. Moya ◽  
Josh Taylor ◽  
Daniel Ray ◽  
...  
Keyword(s):  
Convective Heat ◽  
Flow Rate ◽  
Experimental Studies ◽  
Flow Characteristics ◽  
Heat Losses ◽  
Air Curtain ◽  
Hot Air ◽  
Numerical Studies ◽  
Release Location ◽  
The Impact

The use of an air curtain blowing across the aperture of a falling-particle receiver has been proposed to mitigate convective heat losses and to protect the flow of particles from external winds. This paper presents experimental and numerical studies that evaluate the impact of an air curtain on the performance of a falling particle receiver. Unheated experimental studies were performed to evaluate the impact of various factors (particle size, particle mass flow rate, particle release location, air-curtain flow rate, and external wind) on particle flow, stability, and loss through the aperture. Numerical simulations were performed to evaluate the impact of an air curtain on the thermal efficiency of a falling particle receiver at different operating temperatures. Results showed that the air curtain reduced particle loss when particles were released near the aperture in the presence of external wind, but the presence of the air curtain did not generally improve the flow characteristics and loss of the particles for other scenarios. Numerical results showed that the presence of an air curtain could reduce the convective heat losses, but only at higher temperatures (>600°C) when buoyant hot air leaving the aperture was significant.

scholarly journals Effects of an Air Curtain on the Temperature Distribution in Refrigerated Vehicles Under a Hot Climate Condition

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Lin Cong ◽  
Qinghua Yu ◽  
Geng Qiao ◽  
Yongliang Li ◽  
Yulong Ding
Keyword(s):  
Energy Dissipation ◽  
Air Temperature ◽  
Cold Chain ◽  
Airflow Rate ◽  
Open Door ◽  
Air Curtain ◽  
Hot Air ◽  
Hot Climate ◽  
Perishable Goods ◽  
Cold Energy

Refrigerated vehicle plays an essential role in the cold-chain applications. It directly affects the quality and shelf life of specialized perishable goods. However, the cold energy dissipation caused by natural convection through an open door during partial unloading breaks the isothermal cold environment and notably elevates the air temperature inside the refrigerated container. This temperature rise is harmful to the remaining food. In this study, an air curtain was introduced near the container doorway to attempt to reduce the cold energy dissipation caused by partial unloading. A numerical model was established to explore the effects of the key parameters of the air curtain such as the airflow rate, nozzle width, and jet angle on the air flow and temperature evolution inside the refrigerated container after the door is opened. The numerical results show that the key parameters need to be tailored to form a stable and effective air curtain for preventing the internal cold energy loss or external hot air invasion. An effective and stable air curtain was formed to make the inner air temperature increase only by about 3 °C from the initial temperature of 5 °C after the door was opened, when the jet velocity was set to 2 m/s, the nozzle width was set as 7.5 cm, and the jet angle was set between 0 deg and 15 deg. This work can offer significant guidance for the introduction of an effective air curtain in a refrigerated vehicle to avoid the failure of cold-chain transportation.

Numerical Simulation of Small Cold Storage

2011 ◽  
Vol 50-51 ◽  
pp. 896-900
Author(s):  
Xiao Hui Zhong ◽  
Yu Ling Zhai ◽  
Yun Jun Gou
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Wind Speed ◽  
Temperature Gradient ◽  
Cold Storage ◽  
Outdoor Air ◽  
Air Curtain ◽  
Hot Air

The airflow change in cold storage were simulated by FLUENT under following three conditions, pre-cooling, stop to defrost and switch cold storage door. The result shows that the pre-cooling wind speed should be chose reasonably while guarantees the pre-cooling effort, hot air defrost had a favorable defrosting performance, and it is essential to seek optimal defrosting time according to the frost thickness and energy consume. The temperature field near the switch door was analyzed, and the temperature gradient near the switch door is considerable, but the outdoor air can be obstructed by increase air curtain.

Sign in / Sign up

Export Citation Format

Share Document