西安市某商场冬季室内热分层与空调热负荷的研究
发布时间：2019-01-14 16:32
【摘要】：许多商场在冬季会出现室内温度上高下低的现象,特别是在带有巨大中庭的商场建筑中,由于中庭的烟囱效应,气流在热浮升力的影响下逐渐向顶层聚集,从而出现商场内上高下低的温度分层现象。不均匀的室内温度会给人们带来强烈的不舒适感,这不仅会影响消费者的购物欲望,更造成了极大的能源浪费。但由于相关规范及理论的不完善,导致该问题一直没有得到很好地解决。本文以西安市某商场为研究对象,在冬季对商场内温度、人员以及灯光照度等进行了测试,发现该商场内上层温度明显偏高,且存在严重的温度分层现象。针对上述问题,利用EnergyPlus软件,根据现有建筑的基本情况进行建模,根据所得实测数据计算出实际工况下的每层热负荷值,并与设计工况下的每层热负荷值进行对比分析,得到该建筑热负荷变化的一般规律,经过进一步的理论计算与分析,总结归纳出该建筑的负荷迁移系数Ki。负荷迁移系数Ki的提出,在一定程度上反映出了冬季商场内负荷分布情况,可以利用负荷迁移系数Ki,提出解决冬季商场热分层的具体方案。在解决热分层的各种措施中,论文选择了改变送风量与排风量发热两种措施,并利用CFD软件进行模拟验证,即改变送风量与排风量。通过对比建筑模型的温度场与速度场,发现在变送风模型与变排风模型中,室内温度分布均比原始模型均匀,温度梯度明显降低,在变送风模型中,温度梯度比原始模型下降了0.8℃左右,在变排风模型中,温度梯度比原始模型下降了0.4℃左右,两种模型均对室内温度分层现象有一定的改善效果,证明可以利用负荷迁移系数Ki来调整空调方案,进行室内温度的调节。
[Abstract]:In many shopping malls, indoor temperatures tend to be high and low in winter, especially in market buildings with large atriums. Due to the chimney effect in the atrium, airflow gradually accumulates to the top floor under the influence of hot floating lift. As a result, the appearance of high and low temperature stratification phenomenon in the market. Uneven indoor temperature will bring people a strong sense of discomfort, which will not only affect the consumer's shopping desire, but also cause a great waste of energy. However, due to the imperfection of relevant norms and theories, the problem has not been solved well. This paper takes a shopping mall in Xi'an as the research object, and tests the temperature, personnel and light intensity of the shopping mall in winter. It is found that the upper layer temperature of the shopping mall is obviously high, and there is a serious phenomenon of temperature stratification. In view of the above problems, using EnergyPlus software, according to the basic conditions of the existing building to model, according to the measured data to calculate the actual operating conditions of each layer of heat load value, and the design of each layer of heat load value of the comparative analysis. The general law of thermal load variation of the building is obtained. Through further theoretical calculation and analysis, the load transfer coefficient Ki. of the building is summed up. The proposed load transfer coefficient (Ki) reflects the load distribution in the shopping malls in winter to some extent. The specific scheme to solve the thermal stratification in winter shopping malls can be put forward by using the load transfer coefficient Ki,. Among the measures to solve thermal stratification, the paper chooses two kinds of measures to change the quantity of air supply and the quantity of heat of exhaust air, and use CFD software to simulate and verify, that is, to change the quantity of air supply and quantity of exhaust air. By comparing the temperature field and velocity field of the building model, it is found that the indoor temperature distribution is more uniform and the temperature gradient is obviously lower than that of the original model in the transmission air model and the variable exhaust air model. The temperature gradient is about 0.8 鈩，
本文编号：2408879
[Abstract]:In many shopping malls, indoor temperatures tend to be high and low in winter, especially in market buildings with large atriums. Due to the chimney effect in the atrium, airflow gradually accumulates to the top floor under the influence of hot floating lift. As a result, the appearance of high and low temperature stratification phenomenon in the market. Uneven indoor temperature will bring people a strong sense of discomfort, which will not only affect the consumer's shopping desire, but also cause a great waste of energy. However, due to the imperfection of relevant norms and theories, the problem has not been solved well. This paper takes a shopping mall in Xi'an as the research object, and tests the temperature, personnel and light intensity of the shopping mall in winter. It is found that the upper layer temperature of the shopping mall is obviously high, and there is a serious phenomenon of temperature stratification. In view of the above problems, using EnergyPlus software, according to the basic conditions of the existing building to model, according to the measured data to calculate the actual operating conditions of each layer of heat load value, and the design of each layer of heat load value of the comparative analysis. The general law of thermal load variation of the building is obtained. Through further theoretical calculation and analysis, the load transfer coefficient Ki. of the building is summed up. The proposed load transfer coefficient (Ki) reflects the load distribution in the shopping malls in winter to some extent. The specific scheme to solve the thermal stratification in winter shopping malls can be put forward by using the load transfer coefficient Ki,. Among the measures to solve thermal stratification, the paper chooses two kinds of measures to change the quantity of air supply and the quantity of heat of exhaust air, and use CFD software to simulate and verify, that is, to change the quantity of air supply and quantity of exhaust air. By comparing the temperature field and velocity field of the building model, it is found that the indoor temperature distribution is more uniform and the temperature gradient is obviously lower than that of the original model in the transmission air model and the variable exhaust air model. The temperature gradient is about 0.8 鈩，
本文编号：2408879
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