A Transient Two-dimensional CFD Evaluation of Indoor Thermal Comfort with an Intermittently-operated Radiant Floor Heating System in an Office Building

2020 ◽  
Vol 7 (1) ◽  
pp. 62-87
Author(s):  
Jiying Liu ◽  
◽  
Xuwei Zhu ◽  
Moon Kim ◽  
Ping Cui ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Heating System ◽  
Office Building ◽  
Two Dimensional ◽  
Indoor Thermal Comfort ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

scholarly journals Comparative Analysis of System Performance and Thermal Comfort for an Integrated System with PVT and GSHP Considering Two Load Systems: Convective Heating and Radiant Floor Heating

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5524
Author(s):  
Sangmu Bae ◽  
Yujin Nam ◽  
Joon-Ho Choi
Keyword(s):  
Thermal Comfort ◽  
System Performance ◽  
Heating System ◽  
Integrated System ◽  
Convective Heating ◽  
Generation System ◽  
Indoor Thermal Comfort ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

The zero-energy building (ZEB) concept has a high potential for securing energy savings in the building sector. To achieve ZEB, various active systems, including renewable systems such as photovoltaic, solar heating, and geothermal systems, have been developed. However, the existing systems are costly or not optimized. To overcome these issues, the authors previously developed an integrated tri-generation system. In this research, the previously developed system was comprehensively analyzed considering the indoor thermal comfort and energy efficiency to develop a design and operation method for the integrated system. Two different heating systems (convective heating and radiant floor heating) were employed in the tri-generation system, and their system performance, predicted mean vote (PMV), and predicted percentage of dissatisfied (PPD) were compared using simulations. The results showed that the heating coefficient of power of the radiant floor heating system was 18.8% higher than that of the convective heating system. Moreover, the radiant floor heating system (Case 4) met the PMV and PPD standards during all the heating periods. Overall, radiant floor heating was found to be more efficient than convective heating. The results confirm that radiant floor heating is more suitable than convective heating considering the indoor thermal comfort of occupants.

scholarly journals Research on the influence of uneven solar radiation distribution on the radiant floor heating system in railway stations on Tibetan Plateau

2021 ◽  
Vol 261 ◽  
pp. 01058
Author(s):  
Jiacheng Zheng ◽  
Tao Yu ◽  
Bo Lei ◽  
Ruixin Lv ◽  
Chen Chen ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Tibetan Plateau ◽  
Solar Radiation ◽  
Thermal Comfort ◽  
Heating System ◽  
Railway Stations ◽  
Radiation Distribution ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

In cold regions, radiant floor heating systems are commonly used in public buildings due to better thermal comfort and lower energy consumption. However, in transportation buildings with many transparent envelopes such as railway stations on Tibetan Plateau, the strong solar radiation entering into the station may cause local overheating, which has a great effect on the radiant floor heating system. In this paper, a railway station on Tibetan Plateau is simulated to investigate the influence of uneven solar radiation distribution on the radiant floor heating system. Results show that due to the strong solar radiation, the floor surface temperature and indoor operative temperature in some parts of the waiting hall can reach up to 30 °C and 26 °C, respectively. The temperature difference of the floor surface can even exceed 5 °C occasionally during the heating period. According to the results, it can be found that the method of reducing the heating in the area with strong solar radiation and making full use of solar radiation for heating is an effective way to improve the indoor thermal comfort and reduce the heating energy consumption of heating system.

Effects of Exterior Window on Temperature Distribution and Thermal Comfort of Commercial Buildings with Radiant Floor Heating System

2011 ◽  
Vol 55-57 ◽  
pp. 219-223 ◽  
Author(s):  
Wei Cai ◽  
Zhao Hui Wu ◽  
Jun Ming Li
Keyword(s):  
Temperature Distribution ◽  
Boundary Conditions ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Heating System ◽  
Commercial Buildings ◽  
Radiant Heat Transfer ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

The purpose of this study is to investigate the effect of boundary conditions on the temperature distribution and thermal comfort of a radiant floor heating system and their practical application to commercial buildings. Indoor thermal environment, along with human response, was studied by means of CFD. The three-dimensional temperature distribution was numerically simulated with the zero-equation turbulent model. And two typical operating models, which there is and there is no windows in the room were analyzed in detail. The results show that the radiant floor heating system can meet the demand of comfortable degree, and that the temperature field is enormously influenced by boundary conditions. It is necessary to install curtains to decrease the radiant heat transfer of the cooling glass surface and other control methods to ensure the room to be a thermal comfortable environment.

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