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.

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

2014 ◽  
Vol 548-549 ◽  
pp. 1739-1743
Author(s):  
Kun Ru Ma ◽  
Yi Jun Wang ◽  
Xin Wang
Keyword(s):  
Numerical Simulation ◽  
Energy Saving ◽  
Physical Model ◽  
Wind Pressure ◽  
Outdoor Air ◽  
Air Curtain ◽  
Dining Room ◽  
Set Up ◽  
Saving Effect ◽  
Close Condition

The dining room door with going out and coming in of people and goods is often opened, heating and air-conditioning building in order to energy-saving and preventing the outdoor air on indoor environment influence, install a set of air curtain at the entrance of the dining room door to stopping the outdoor air, commonly used air curtain is ceiling type air curtain. This article in view of the gate of one area, a layer of the dining room of Hebei University of science and technology of a new campus area set up physical model of air curtain and reasonable simplification, determining the calculation area of the numerical simulation and air curtain close condition. Then adopting the UFD method to wind pressure, hot pressure and the air curtain air flowing of the local hot pressure stack of main entrance set up physical model, through the numerical simulation of air curtain different jet angle, demonstrate the air energy-saving effect, provide the reference for the choice of the air curtain.

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.

scholarly journals Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5719
Author(s):  
JiHyun Hwang ◽  
Taewon Lee
Keyword(s):  
Power Consumption ◽  
Energy Saving ◽  
Data Centers ◽  
Cooling System ◽  
Stable Operation ◽  
Air Cooling ◽  
Outdoor Air ◽  
Air Conditioners ◽  
Air Cooling System ◽  
Saving Effect

The recent expansion of the internet network and rapid advancements in information and communication technology are expected to lead to a significant increase in power consumption and the number of data centers. However, these data centers consume a considerable amount of electric power all year round, regardless of working days or holidays; thus, energy saving at these facilities has become essential. A disproportionate level of power consumption is concentrated in computer rooms because air conditioners in these rooms are required to operate throughout the year to maintain a constant indoor environment for stable operation of computer equipment with high-heat release densities. Considerable energy-saving potential is expected in such computer rooms, which consume high levels of energy, if an outdoor air-cooling system and air conditioners are installed. These systems can reduce the indoor space temperature by introducing a relatively low outdoor air temperature. Therefore, we studied the energy-saving effect of introducing an outdoor air-cooling system in a computer room with a disorganized arrangement of servers and an inadequate air conditioning system in a research complex in Korea. The findings of this study confirmed that annual energy savings of up to approximately 40% can be achieved.

scholarly journals EVALUATION OF NATURAL VENTILATION PROPERTY AND ENERGY SAVING EFFECT BY FIELD MEASUREMENT AND NUMERICAL SIMULATION IN SPRING

2013 ◽  
Vol 78 (686) ◽  
pp. 351-357
Author(s):  
Ryuichi YASUNAGA ◽  
Tomoya SAKAMOTO ◽  
Yasuyuki SHIRAISHI ◽  
Yoshie UCHIKAWA ◽  
Yasushi NAKAMURA
Keyword(s):  
Numerical Simulation ◽  
Energy Saving ◽  
Field Measurement ◽  
Natural Ventilation ◽  
Saving Effect

scholarly journals Is the heating energy saving effect by lowering the temperature setpoint similar in different functional buildings?

2020 ◽  
Vol 198 ◽  
pp. 03005
Author(s):  
Yuxin Huang ◽  
Shurui Guo ◽  
Zhu Cheng ◽  
Ning Mao ◽  
Enshen long
Keyword(s):  
Energy Saving ◽  
Air Temperature ◽  
Heating Temperature ◽  
Relative Energy ◽  
Comprehensive Analysis ◽  
Outdoor Air ◽  
Time Perspectives ◽  
Absolute Energy ◽  
Saving Effect ◽  
Saving Measure

It is known that reducing the temperature setpoint is an effective heating energy saving measure for all kinds of buildings. This study focuses on the heating demand saving effect of the same buildings for different functional uses based on the same climatic background (Beijing) and the same reduction in the heating setpoint. Through comprehensive analysis of the absolute energy saving amount (ESA) and the relative energy saving ratio (ESR) from different time perspectives, the heating energy saving mechanism in reducing the heating temperature is discussed. Two types of completely different heating saving mechanisms were found: (1) the behavioural energy saving (BES) was dominated by those heating hours in which the outdoor air temperature or indoor integrated temperature was in the reducing range of heating setpoint, and(2) the energy saving of the temperature difference (ESTD) is dominated the rest heating hours. When the buildings were used for different functions, the annual ESA was determined by the numbers of the above two types of heating hours, and the annual heating ESR was mainly determined by the heating hours when the heating demand was large.

scholarly journals ESTIMATION OF ANNUAL OPERATION RESULTS AND ENERGY SAVING EFFECT BASED ON FIELD MEASUREMENT AND NUMERICAL SIMULATION

2014 ◽  
Vol 79 (703) ◽  
pp. 777-784 ◽  
Author(s):  
Tomoya SAKAMOTO ◽  
Yuta TOMIYASU ◽  
Yasuyuki SHIRAISHI ◽  
Yoshie UCHIKAWA ◽  
Yasushi NAKAMURA
Keyword(s):  
Numerical Simulation ◽  
Energy Saving ◽  
Field Measurement ◽  
Saving Effect ◽  
Operation Results

Experimental Study and Numerical Simulation on Hydrodynamic Performance of a Twisted Rudder

2015 ◽  
Vol 49 (5) ◽  
pp. 58-69 ◽  
Author(s):  
Yu Sun ◽  
Yu-min Su ◽  
Hai-zhou Hu
Keyword(s):  
Numerical Simulation ◽  
Energy Saving ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Surface Panel Method ◽  
Thrust Coefficient ◽  
Propeller Wake ◽  
Pressure Distributions ◽  
The Difference ◽  
Saving Effect

AbstractTo analyze the energy-saving effect of a twisted rudder, this work presents the simulated and experimental results of propeller-rudder systems. In this article, a surface panel method (SPM) and computational fluid dynamics (CFD) are introduced to simulate the hydrodynamic performance of propeller-rudder systems. The thrust coefficient Kt, torque coefficient Kq, open-water efficiency η of the propeller, and thrust coefficient Kr of the rudder as a function of the advance coefficient J are obtained and plotted. The energy-saving effect of the twisted rudder is analyzed by comparing the results of numerical simulation and a cavitation tunnel experiment. The experimental energy-saving effect is 2.23% at the design advance coefficient J = 0.8. The pressure distributions of the propeller blade and rudder are plotted by two methods, and the difference of the force on an ordinary rudder and a twisted rudder is discussed. This study improved the experimental twisted rudder model. The change makes the rudder take advantage of propeller wake and improves the energy-saving effect of a twisted rudder. After improvement, the energy-saving effects obtained by the two methods are 0.448% and 0.441%. To analyze the energy-saving mechanism, this study compares the pressure distributions and efficiencies of different systems.

Energy Saving Effect by Steel Yankee Dryer

2014 ◽  
Vol 68 (6) ◽  
pp. 638-643
Author(s):  
Makoto Matsushita ◽  
Takefumi Ide
Keyword(s):  
Energy Saving ◽  
Saving Effect

The Effect of Using Ramps with Trench Cylindrical Holes on Film Cooling Effectiveness

2015 ◽  
Vol 3 (2) ◽  
pp. 15-27
Author(s):  
Ahmed A. Imram ◽  
Humam K. Jalghef ◽  
Falah F. Hatem
Keyword(s):  
Numerical Simulation ◽  
Film Cooling ◽  
Air Injection ◽  
Baseline Model ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness ◽  
Blowing Ratio ◽  
Hot Air ◽  
Test Study ◽  
Cylindrical Holes

     The effect of introducing ramp with a cylindrical slot hole on the film cooling effectiveness has been investigated experimentally and numerically. The film cooling effectiveness measurements are obtained experimentally. A test study was performed at a single mainstream with Reynolds number 76600 at three different coolant to mainstream blowing ratios 1.5, 2, and 3. Numerical simulation is introduced to primarily estimate the best ramp configurations and to predict the behavior of the transport phenomena in the region linked closely to the interaction between the coolant air injection and the hot air mainstram flow. The results showed that using ramps with trench cylindrical holes would enhanced the overall film cooling effectiveness by 83.33% compared with baseline model at blowing ratio of 1.5, also  the best overall flim cooling effectevness was obtained at blowing ratio of 2 while it is reduced at blowing ratio of 3.

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