The Experimental Study on the Effects of Supply Air Angle on Indoor Thermal Environment

2014 ◽  
Vol 548-549 ◽  
pp. 584-587
Author(s):  
Ze Qin Liu ◽  
Ge Li ◽  
Yun Su
Keyword(s):  
Experimental Study ◽  
Temperature Field ◽  
Temperature Gradient ◽  
Indoor Air ◽  
Thermal Environment ◽  
Indoor Temperature ◽  
Indoor Thermal Environment ◽  
Average Temperature ◽  
Human Thermal Comfort ◽  
Main Activity

Different indoor thermal environment was affected by the different supply air parameters. In this paper, the indoor temperature field and PMV value in the conditions of different supply air angles were studied to explore the influence of indoor thermal environment and human thermal comfort affected by the varied supply air angles. The experimental results showed that the average temperature of indoor air and the temperature gradient of personnel main activity area increased with increasing the supply air angel. In contrast, a relatively comfortable indoor thermal environment could be formed with the supply air angel between 0°to 15°.

Typical effects of occupants’ behaviour on indoor air-conditioned environments in the hot summer and cold winter region of China

2020 ◽  
pp. 1420326X1990064
Author(s):  
Biao Yan ◽  
Xi Meng ◽  
Jinlong Ouyang ◽  
Enshen Long
Keyword(s):  
Energy Consumption ◽  
Indoor Air ◽  
Thermal Environment ◽  
Heating Temperature ◽  
Characteristic Temperature ◽  
Indoor Temperature ◽  
Indoor Thermal Environment ◽  
Door Opening ◽  
Survey Results ◽  
The Relationship

This paper examines the effects of occupants’ behaviour on the thermal environment in air-conditioned rooms. Typical occupants’ behaviours were determined from survey results in the hot summers and cold winters region of China. The temperature setpoint, intermittent operation and door opening were determined as influencing factors in a theoretical model for maintaining thermal comfort with minimal energy consumption. The concepts of the temperature change index and characteristic temperature were introduced to predict the relationship between the indoor thermal environment and occupants’ behaviour. The model was validated with empirical experiments and numerical simulations. The results indicated that continuous opening of doors and windows in air-conditioned rooms would increase the energy consumption that is needed to maintain a desirable indoor thermal environment. The average indoor temperature at 25°C setpoint heating temperature with the door open at 90° was found equal to the average indoor setpoint temperature of 22°C with the door open at 45°. The relative effects of the tested occupants’ behaviours were also evaluated.

Simulation and Comparative Analysis on Environmental Control in Subway

2012 ◽  
Vol 209-211 ◽  
pp. 1068-1072
Author(s):  
Ming Liu ◽  
Bao Gang Zhang ◽  
Liu Wen ◽  
Zhong Zhi Huang
Keyword(s):  
Temperature Field ◽  
Energy Consumption ◽  
Comparative Analysis ◽  
Environmental Control ◽  
Thermal Environment ◽  
Airflow Velocity ◽  
Waiting Room ◽  
Local Climate ◽  
Average Temperature ◽  
Environment Control

To ensure passengers can have a comfortable thermal environment in the subway waiting room is one of the main targets in subway environment control. By using the CFD software, this paper takes an island platform with double-layer of Shenyang as the object to simulate the thermal environment of platform screen door and ventilation in the open system, then detailed analysis on the variation of the temperature field, airflow velocity field in the typical position. The results indicated that average temperature of no-PSD system platform is 2.5 ~3 °C higher than that of PSD system, standing room is 1.5 °C higher than that of PSD system , but these also meet the requirement of the standards of the environmental control and passengers’ thermal comfort. Meanwhile, through the comparative analysis to the energy consumption of the two systems, we find ventilating condition has superior to PSD system in energy saving, and it is more suitable for the local climate in the northeast.

scholarly journals Energy-saving potential of intermittent heating system: Influence of composite phase change wall and optimization strategy

2020 ◽  
pp. 014459872096921
Author(s):  
Yanru Li ◽  
Enshen Long ◽  
Lili Zhang ◽  
Xiangyu Dong ◽  
Suo Wang
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Air Temperature ◽  
Indoor Air ◽  
Thermal Environment ◽  
Optimization Strategy ◽  
Indoor Thermal Environment ◽  
Indoor Thermal Comfort ◽  
Intermittent Heating

In the Yangtze River zone of China, the heating operation in buildings is mainly part-time and part-space, which could affect the indoor thermal comfort while making the thermal process of building envelope different. This paper proposed to integrate phase change material (PCM) to building walls to increase the indoor thermal comfort and attenuate the temperature fluctuations during intermittent heating. The aim of this study is to investigate the influence of this kind of composite phase change wall (composite-PCW) on the indoor thermal environment and energy consumption of intermittent heating, and further develop an optimization strategy of intermittent heating operation by using EnergyPlus simulation. Results show that the indoor air temperature of the building with the composite-PCW was 2–3°C higher than the building with the reference wall (normal foamed concrete wall) during the heating-off process. Moreover, the indoor air temperature was higher than 18°C and the mean radiation temperature was above 20°C in the first 1 h after stopping heating. Under the optimized operation condition of turning off the heating device 1 h in advance, the heat release process of the composite-PCW to the indoor environment could maintain the indoor thermal environment within the comfortable range effectively. The composite-PCW could decrease 4.74% of the yearly heating energy consumption compared with the reference wall. The optimization described can provide useful information and guidance for the energy saving of intermittently heated buildings.

Analysis and Test on Indoor Thermal Environment of Tibetan-Style Dwellings of Different Materials

2011 ◽  
Vol 255-260 ◽  
pp. 1632-1638 ◽  
Author(s):  
Li Ping Li
Keyword(s):  
Physical Environment ◽  
Thermal Environment ◽  
Field Tests ◽  
Building Envelope ◽  
Rammed Earth ◽  
Test Results ◽  
Indoor Temperature ◽  
Temperature Changes ◽  
Indoor Thermal Environment ◽  
Earth Walls

Field tests for indoor thermal environment of Tibetan-style dwellings of different materials in Shangri-La in winter were carried out from the perspective of physical environment of buildings, and more specifically, the indoor temperature of Tibetan-style dwellings with rammed earth walls and brick walls as well as the surface temperature of building envelope were tested and comparatively analyzed. The test results show the current situations and features of indoor temperature changes of Tibetan-style dwellings of different materials, which may provide a basis for improving the thermal environment of Tibetan-style dwellings.

Experimental Study on Solar Energy Added Kang Heating System

2014 ◽  
Vol 521 ◽  
pp. 41-47
Author(s):  
Gang Li ◽  
Huan Wang ◽  
Run Ping Niu ◽  
Qi Zhen Chen ◽  
Zhen Li
Keyword(s):  
Solar Energy ◽  
Thermal Environment ◽  
Thermal Inertia ◽  
Heating System ◽  
Capillary Network ◽  
Network Systems ◽  
Indoor Temperature ◽  
Average Temperature ◽  
The Difference ◽  
At Will

In this paper, the author use solar energy with capillary network systems as the added heating measure of kang . The influence of the system on the surface temperature of Kang and the indoor temperature was researched by experiment. The tested data shows that the average temperature of the head、medium and tail of traditional Kang in a normal room are 65.7°C、43.28°C and 39.82°C. The difference of temperature on Kang surface is higher than 20°C. The average temperatures of the head、middle and tail of the Kang using this system are 51.34°C、38.26°C and 33.79°C. Comparing the two groups of data, we can get the conclusion that the distribution of temperature in the new system Kang is more balance than traditional Kang, which improves the surface comfort of Kang. The average indoor temperature with solar energy auxiliary Kang is 18.5 °C, which is 6.3°C higher than ordinary room. Due to the small thermal inertia of capillary network, the indoor temperature rises quickly when the system is running. It can make quality improvement of indoor thermal environment realtime at will, which greatly improves the thermal comfort of the Kang surface and indoor temperature.

Analysis and Test on Indoor Thermal Environment of Timber Dwellings in Shangri-La

2013 ◽  
Vol 651 ◽  
pp. 466-469
Author(s):  
Li Ping Li ◽  
He Wang ◽  
Shuai Fan
Keyword(s):  
Surface Temperature ◽  
Physical Environment ◽  
Thermal Environment ◽  
Field Tests ◽  
Building Envelope ◽  
Test Results ◽  
Indoor Temperature ◽  
Temperature Changes ◽  
Indoor Thermal Environment

Field tests for indoor thermal environment of Tibetan-style timber dwellings in Shangri-La were carried out， from the perspective of physical environment of buildings, and more specifically, the indoor temperature of Tibetan-style timber dwellings as well as the surface temperature of building envelope were tested and comparatively analyzed. The test results show the current situations and features of indoor temperature changes of Tibetan-style timber dwellings, which may provide a basis for improving the thermal environment of Tibetan-style dwellings.

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