Numerical Simulation of Indoor Thermal Environment of a Double-Skin Facade Office with Different Shutter Angles

2014 ◽  
Vol 694 ◽  
pp. 256-259
Author(s):  
Xin Zhan ◽  
Hua Yang ◽  
Feng Yun Jin
Keyword(s):  
Heat Transfer ◽  
Thermal Environment ◽  
Ventilation Rate ◽  
Air Distribution ◽  
Indoor Thermal Environment ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfer Simulation ◽  
Shading Devices ◽  
Rng Turbulence Model

Airflow and heat transfer simulation was conducted for a double-skin façade (DSF) system equipped with shading devices in the cavity, using computational fluid dynamics (CFD) with RNG turbulence model and PISO algorithm, for five conditions of slat angles (θ=0°, 30°, 45°, 60°, 90°). The present study indicates that the presence of shading devices influences the temperatures, the ventilation rate and the air distribution in the DSF system. Besides, the different angles will make different influences.

Simulation and Analysis of Thermal Performance of Internal Recycle Double Skin Facades

2014 ◽  
Vol 580-583 ◽  
pp. 2415-2420 ◽  
Author(s):  
Cun Hui ◽  
Yuan Qing Wang ◽  
Bin Wang ◽  
Wei Tao ◽  
Sheng Lin Zheng
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Ventilation Rate ◽  
Heat Transfer Process ◽  
Comfort Level ◽  
Curtain Wall ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Double Skin Facades

Simulation and analysis of heat transfer process in internal recycle double skin facades (DSF) of the established standard model were carried out by computational fluid dynamics (CFD). Comprehensive heat transfer coefficient under the condition of different ventilation rate of DSF with and without blinds was studied. The results show: the increase of the ventilation rate can not only improve the comprehensive heat transfer coefficient, but also improve the temperature of inner surface of the inner curtain wall. Double skin facades can improve the comfort level of the indoor environment, reduce the energy loss of the palisade structure and reduce energy consumption.

Optimal Design of the External Respiration Double Skin Facade

2011 ◽  
Vol 374-377 ◽  
pp. 257-262
Author(s):  
Shi Feng ◽  
Wang Wei
Keyword(s):  
Optimal Design ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
External Respiration ◽  
Indoor Temperature ◽  
Temperature Changes ◽  
Indoor Thermal Environment ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

An optimal design is taken on the external respiration double skin facade (DSF) of a office building in Wuhan. The indoor thermal environment of the office units in the building have been simulated by taken computational fluid dynamics (CFD) method, and then the paper analyzes the indoor temperature changes under the condition that the internal airflow status of the DSF for natural ventilation, without shade, vents closed and other cases, discusses the influences of different inner glazed skin’s thermal properties, DSF for active ventilation and different wind speed on indoor thermal environment, according to the simulation results we obtain parameters of relevant optimal design.

Characteristics of Heat Transfer During Cooling Down Process in a Single Cargo Tank of LNG Carrier

2020 ◽  
Vol 162 (A3) ◽  
Author(s):  
J J Deng ◽  
L Y Song ◽  
J Xu ◽  
B Liu ◽  
J S Lu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Deep Understanding ◽  
Liquefied Natural Gas ◽  
Cfd Model ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfer Simulation ◽  
Lng Tank

A deep understanding of heat transfer characteristics is essential in evaluating risk and putting forward any option for the Liquefied Natural Gas (LNG) tank cooling down process. A novel Computational Fluid Dynamics (CFD) model was built to perform the flow and heat transfer simulation of the process. The predicted results agreed well with the test data from a prototype LNG tank. Then the heat transfer characteristics of the process were analysed. It was found that the vapour temperature and density were linearly varying and became stable after 2.3 hours. A sudden pressure drop risk was identified during the process, which will cause the inwards collapse risk of the invar membrane. Then the proposals to prevent the risks of the inwards collapsing membrane are presented. The heat transfer characteristics of the vapour and different membrane layers were analysed in detail, and if the suggested option was to be implemented this could save about 39% of LNG consumed.

Study on the Influence of Neighbour Room Heat Transfer on the Indoor Thermal Environment in a Heating Room

2014 ◽  
Vol 1070-1072 ◽  
pp. 2006-2009
Author(s):  
Ye Wang ◽  
Tong Zou ◽  
Wen Ting Hu
Keyword(s):  
Heat Transfer ◽  
Temperature Difference ◽  
Thermal Environment ◽  
Internal Surface ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Indoor Thermal Environment ◽  
Average Temperature ◽  
Nusselt Numbers ◽  
Temperature Filed

To obtain the influence of the neighbour room heat transfer on the radiator heat transfer characteristics and indoor thermal environment, a new k-ε model is used to numerically simulate the radiator surface heat transfer ability, indoor velocity field and temperature filed at different neighbour room heat transfer temperature differences. The results indicate that both the radiator surface temperature and the average Nusselt numbers on radiator surface are approximately increasing with the increasing neighbour room heat transfer temperature differences when the indoor average temperature is up to 18°C. At the same neighbour room heat transfer temperature difference, the local heat transfer ability is decreasing gradually from the bottom to the top of the radiator surface. The temperature gradient close to the floor is decreasing with the increasing neighbour room heat transfer temperature difference and the indoor temperature is tending to be more homogeneous. And the velocity gradients close to the ceiling and the internal surface of east wall are higher for the case that the neighbour room heat transfer is considered.

A Review of Research Development of Ventilated Double-Skin Facade

2014 ◽  
Vol 587-589 ◽  
pp. 709-713
Author(s):  
Xin Feng ◽  
Hua Yang ◽  
Xi Yang Feng ◽  
Feng Yun Jin ◽  
Guo Qiang Xia
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Solar Radiation ◽  
Building Energy ◽  
Ventilation Rate ◽  
Channel Width ◽  
Visual Comfort ◽  
Research Development ◽  
Building Energy Conservation ◽  
Double Skin

Demands for the building energy conservation, thermal and visual comfort make the ventilated double-skin facade (DSF) more attractive and more popular in commercial buildings. This paper reviews the recent research development of ventilated double-skin facade in China. The velocity and temperature distribution in the double-skin facade (DSF) are reviewed, together with the effects of glass types, channel width, intensity of solar radiation and shading methods on the heat transfer of ventilated double-skin facade (DSF). This paper also describes the effect of the different combinations of glass, blinds settings, ventilation rate and the channel width, intensity of solar radiation and shading. Furthermore, the methods to improve the energy saving of ventilated double-skin facade (DSF) are also reviewed.

scholarly journals Winter Thermal Environment and Thermal Performance of Rural Elderly Housing in Severe Cold Regions of China

2020 ◽  
Vol 12 (11) ◽  
pp. 4543
Author(s):  
Huibo Zhang ◽  
Ya Chen ◽  
Hiroshi Yoshino ◽  
Jingchao Xie ◽  
Zhendong Mao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Thermal Performance ◽  
Thermal Environment ◽  
The Elderly ◽  
Living Room ◽  
Cold Regions ◽  
Indoor Thermal Environment ◽  
The Heat Transfer Coefficient

Understanding the thermal performance of the residential envelope is important for optimizing the indoor thermal environment. In this study, the indoor thermal environment and thermal performance of rural residences housing the elderly was determined through field measurements in Qiqihar in 2017 and 2019. The results revealed that the living room temperatures in more than 50% of homes were below the thermal neutral temperature for the elderly (17.32 °C). Moreover, the indoor thermal environment changed significantly during the day, with the predicted mean vote during the day fluctuating from 2 to 4 units. The air change rate of living rooms in 2017 and 2019 was 0.20–2.20 h−1 and 0.15–1.74 h−1, respectively. Residential ventilation times detected by an air-tightness detector ranged from 0.40–1.49 h−1. Furthermore, infrared thermography (IRT) detected air leakage in the windows of the all houses in this study, as well as thermal bridges and condensation on the exterior walls of several houses. The heat transfer coefficient of the exterior walls of all houses detected by IRT was 0.25–0.74 W/(m2·K), and a significant positive correlation was observed between the heat transfer coefficient of the south wall and the window-to-wall ratio. Finally, the heat transfer coefficient of the external walls exhibited a negative but not significant correlation with indoor temperature. This study provides detailed data and guidance for improving the indoor environment of rural houses in severe cold regions.

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