The concrete columns as a sensible thermal energy storage medium and a heater
The concrete columns as a sensible thermal energy storage medium and a heater
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混凝土柱作为显热储能介质和加热器
DOI：
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发表时间：
2014
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通讯作者：
Evrim Özrahat
中科院分区：
文献类型：
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作者：
S. Ünalan;Evrim Özrahat
本研究探讨了显热能在多层建筑混凝土柱中储存的可能性，以及利用该储能进行室内采暖的性能。在建议的系统中，能源中心加热的干燥空气将在不锈钢管道中通过塔进行循环。感热能首先在柱状介质中通过强迫对流的方式储存。然后，储存的热能将通过自然对流和辐射从柱面转移到室内空间。对位于土耳其开塞里市的一栋11层建筑的一套公寓进行了瞬态热计算。该公寓的热能需求在冬季的平均水平约为5.3千瓦。简化的暂态计算是在混凝土空心圆柱体上进行的，其外径为0.31m，内径为0.05m，对应于试件平面内的平均柱截面。流动温度选择在T=350K和500K之间，这比文献中假设的混凝土热强度极限573K的温度低得多。流速范围选择在Vm=1.0~5.0 m/S之间，初始温度设为2 93℃，首次充能时间为2 3h后，当T=350kK，Vm=1.0 m/S时，从柱面进入室内的总热流密度约为5.5kW。通过提高流速和温度，减少了达到5.3kW能量需求所需的首次充电时间。同样对于5.0米/S-350公里和5.0米/S-450公里，这一时间可以分别减少到10小时和4.5小时。此外，在4.0亿米/S-360千克或2.0亿米/S-400千克的情况下，充电8小时后，7天内放电16小时、充电8小时可满足5.3万千瓦的能源需求。在未来的建筑供暖系统方面，结果是非常有吸引力的。
This study investigated storage possibility of sensible thermal energy in the concrete columns of multi-storey buildings and the heating performance of the indoors with the stored energy. In the suggested system, the dry air heated in an energy center will be circulated in stainless steel pipes through columns. The sensible thermal energy would firstly be stored by means of forced convection in column medium. Then, the stored thermal energy will transfer by natural convection and radiation from the column surfaces to indoor spaces. The transient thermal calculations are realized for a flat of the 11-storey building in Kayseri city of Turkey. The thermal energy requirement of the flat is nearby 5.3 kW as an average of a winter season. The simplified transient calculations were carried out over a concrete hollow cylindrical column having outer radius of 0.31 m and inner radius of 0.05 m corresponding an averaged column section in the sample flat. The flow temperature was selected between T = 350 and 500 K, which are considerably lower than the temperature of 573 K assumed as a limit for thermal strength of the concrete in the literature. The flow velocity ranges were selected between V = 1.0 and 5.0 m/s. The initial temperature was assumed as 293 K. After the first energy charging process of 23 h, for T = 350 K and V = 1.0 m/s, the total heat flux from the column surfaces into indoors are nearby 5.5 kW. The first charging time required to reach the energy requirement of 5.3 kW is decreased by increasing the flow velocity and temperature. Also for 5.0 m/s–350 K and 5.0 m/s–450 K, this time can decrease to 10 and 4.5 h, respectively. In addition, with 4.0 m/s–360 K or 2.0 m/s–400 K, after the energy charging of 8 h, the energy requirement of 5.3 kW can be provided by the energy discharging of 16 h and the energy charging of 8 h during 7 days. The results are very attractive in terms of the building heating systems of the future.