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1. A new virtual sphere method to predict free-running temperature | |||
Li Xiang,Chen Bin,Fan Xinying | |||
Civil and Architectural Engineering 08 March 2017 | |||
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Abstract:The free-running temperature is a essential indicator to evaluate the thermal performance of a passive solar house in early design. However a easy-fast, accurate, and dynamic prediction method is lacking for decision-making in early design. Exited accurate and elaborate methods need detailed building information and simulation tools, which are complex and time-comsuming. Besides, exited simpilied methods are still complex for architects or have large hourly error. This paper introduced the virtual sphere method to calculate the dynamic thermal storage of the room, and proposed a new quasi-steady method to predict free-running temperatur. The study on thermal storage performance of a wall indicated only a indoor-side thin effective thermal capacitance layer has dominated effect on thermostability of the indoor space, and the depth of thin layer can be determined by thermal penetration depth formula. In addition, the room effetive thermal capacitance can be equivalent to a virtual sphere, and the dynamic thermal storage can be fast calculated by fitted formula of the classic unsteady heat transfer of a sphere. Then the hourly room free-running temperature can be fast predicted. The empirical validion of a light-weight and a heavy weight passive solar house demonstrated the hourly prediction can be all within the deviation range of ± 3.0 C | |||
TO cite this article:Li Xiang,Chen Bin,Fan Xinying. A new virtual sphere method to predict free-running temperature[OL].[ 8 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4721233 |
2. Engineering application analysis on ground-coupled heat pump system in hot summer and cold winter region | |||
CHEN Jinhua,XIA Lei | |||
Civil and Architectural Engineering 23 December 2013 | |||
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Abstract:The performance and energy efficiency of seven ground-coupled heat pump (GCHP) systems in hot summer and cold winter region are analyzed on the basis of summer and winter testing data and compared with that of air source heat pump system as well as screw water chiller with boiler system. The results demonstrate that: the cooling energy efficiency ratio reaches 3.5~4.2 for units and 2.8~3.3 for systems, the heating energy efficiency reaches 3.2~4.0 for units and 2.2~3.3 for systems. Rates of improvement in energy efficiency of GCHP system are 8.2%~28.8% for cooling and 5.0%~40.4% for heating compared with air source heat pump system. The cooling energy efficiency ratio of GCHPs is a little bit higher than that of water chiller, whereas the heating energy efficiency ratio is 5.8%~47.5% higher than that of boiler. The energy saving rate is obvious. | |||
TO cite this article:CHEN Jinhua,XIA Lei. Engineering application analysis on ground-coupled heat pump system in hot summer and cold winter region[OL].[23 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4577793 |
3. The impact of using light-weight external thermal insulation materials on building surrounding thermal environment in summer | |||
LUO Guozhi,LI Nan,LI Baizhan | |||
Civil and Architectural Engineering 18 August 2011 | |||
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Abstract:Introduce a method for calculating surface heat storage coefficient of wall, and make a calculation on outside surface heat storage coefficient of several common walls with light-weight external thermal insulation materials and the traditional solid clay brick wall. In order to study the impact of using light-weight external thermal insulation materials on the surface temperature of external wall, carry out a contrasting experiment between an external insulation room and an uninsulated room in August, 2010, in Chongqing, China. Calculated result shows that outside surface heat storage coefficient of the insulated wall is much less than that of the traditional wall, the outside surface heat storage capability of the insulated walls is poor, and the surface temperature has great fluctuation. Experimental result shows that, during sunny time, surface temperature of external walls of the insulated room is obviously higher than that of the uninsulated one. In different orientations, due to different amount of solar radiation and being irradiated in different time, the contrasting temperature difference (CTD) appears different varied regularity. In a word, using light-weight external thermal insulation materials is bad for building surrounding thermal environment and has a negative impact on people's health. Finally, some suggestions on how to eliminate the impact, such as improving the surface condition of the building envelop, plating vertical greening etc, are put forward. | |||
TO cite this article:LUO Guozhi,LI Nan,LI Baizhan. The impact of using light-weight external thermal insulation materials on building surrounding thermal environment in summer[OL].[18 August 2011] http://en.paper.edu.cn/en_releasepaper/content/4439020 |
4. Optimization of the architectural design for natural ventilation in residences using CFD | |||
Jin Ming ,Li Baizhan | |||
Civil and Architectural Engineering 24 June 2010 | |||
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Abstract:In order to achieve more efficient natural ventilation and better indoor environment in residences, this paper utilizes numerical simulation to explore the optimization of residential architecture design. In case study, the natural ventilation efficiency of a residence in Chongqing is evaluated by quantitatively analyzing the fields of air velocity and PMV from CFD simulations results, which are validated by field measurements. The analysis shows that the natural ventilation is efficient in the living room, but inefficient in some other rooms. In view of this, some feasible alternative configurations without major changes in the building structures have been studied, including different styles of windows and door positions. It is found that the optimized design could improve the indoor environment by reducing the dead zone and increasing thermal comfort zone. Finally, some architectural design suggestions on the doors and windows in natural ventilated residences are put forward. | |||
TO cite this article:Jin Ming ,Li Baizhan . Optimization of the architectural design for natural ventilation in residences using CFD[OL].[24 June 2010] http://en.paper.edu.cn/en_releasepaper/content/4377002 |
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