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 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

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.

scholarly journals Simulation and experimental verification of energy saving effect of passive preheating natural ventilation double skin façade

2020 ◽  
pp. 014459872095628 ◽  
Author(s):  
Keming Hou ◽  
Shanshan Li ◽  
Haining Wang
Keyword(s):  
Energy Saving ◽  
Natural Ventilation ◽  
Structural Parameters ◽  
Building Energy ◽  
Cold Season ◽  
Green Energy ◽  
Office Building ◽  
Double Skin ◽  
Building Energy Saving ◽  
Saving Effect

In recent years, energy efficiency and energy saving strategies have become priorities for energy policy in most countries, and green energy saving buildings has attracted more attention in the worldwide. The use of passive energy saving natural ventilation strategy can improve the effect of building energy saving and improve the internal microenvironment of the building. This paper introduces and analyzes the passive preheating natural ventilation double skin facade (DSF) comprehensively. The influence of the structural parameters of the double skin facade in cold season ventilation on the preheating ventilation effect is discussed on the basis of the discussion and experiment of an actual double skin facade office building. Further, the energy-saving effect of the passive preheating natural ventilation double skin facade is simulated and verified. The effect of structural parameters of DSF in cold season on the thermal performance is summarized. These corresponding results could provide some reference for the buildings in the similar climate regions.

scholarly journals EVALUATION OF NATURAL VENTILATION RATE BY FIELD MEASUREMENT AND NUMERICAL SIMULATION DURING PRE-ACCEPTANCE PHASE

2012 ◽  
Vol 77 (678) ◽  
pp. 681-688
Author(s):  
Ryuichi YASUNAGA ◽  
Yumi ASHITANI ◽  
Yasuyuki SHIRAISHI ◽  
Yoshie UCHIKAWA ◽  
Yasushi NAKAMURA
Keyword(s):  
Numerical Simulation ◽  
Field Measurement ◽  
Natural Ventilation ◽  
Ventilation Rate

The Energy Saving Effect of Natural Ventilation for Residential Building in Guangzhou

2011 ◽  
Vol 121-126 ◽  
pp. 597-601
Author(s):  
Cui Cui Qin ◽  
Li Hua Zhao
Keyword(s):  
Wind Speed ◽  
Energy Saving ◽  
Air Conditioning ◽  
Natural Ventilation ◽  
Residential Building ◽  
Air Conditioning System ◽  
Effective Measure ◽  
Rate Of Cooling ◽  
Saving Effect ◽  
Cooling Loads

Natural ventilation is the most effective measure to reduce the cooling energy consumption, but it is quite difficult to control and quantitatively assess the natural ventilation. A method was developed with coupling simulation by both software of DeST-h and computational fluid dynamics (CFD) in typical meteorological year (TMY) in Guangzhou. First, the base room temperatures with different air change (ACH) rates of natural ventilated dwelling were simulated with DeST-h. The time period in that the indoor air temperature could meet thermal comfort requirement only by natural ventilation in occupied period was analyzed, in which the wind speed and direction in TMY was obtained for the ventilation environment simulation of rooms in windows and doors switching with the PHOENICS software. The actual air change rates in different rooms in such wind speed and direction were calculated. Also the cooling loads of building in the actual air change rates were simulated with intermittent air conditioning. The air conditioning system operated when the base room temperature was higher than 29°C. Rate of cooling loads reduction was calculated by comparing the result to the baseline, which were the cooling loads of building with 1 ACH. The actual air change rates show that the energy saving effect of natural ventilation was influenced by the windows and doors switching. 61~71.37% of the natural ventilation potential was used in the rooms with windows and doors opened, and 14.06~82.54% of the natural ventilation potential was used in the rooms with windows opened and doors closed. The rate of cooling loads reduction in rooms and building were 0.34~10.50% and 6.14% respectively.

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.

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