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基于暖通设计规范中采暖室外计算温度的统计方法,统计出各典型城市间歇采暖室外计算温度,并分析了相应的热负荷变化。结果表明:对于长期间歇采暖,室外计算温度的取值最大可高于现行规范值3.8℃;对于短期间歇采暖,最大可高于现行规范值4.6℃。以间歇采暖室外计算温度为依据,长期间歇和短期间歇采暖设计热负荷最大可分别降低9%和15%左右。 相似文献
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农村住宅不同采暖方式的模拟对比分析 总被引:3,自引:0,他引:3
以数值传热学理论为基础,以同一房间内的不同采暖方式为研究对象,利用计算流体力学模拟软件对室内温度分布的情况进行分析。模拟结果显示,火炕和火墙联合供暖的方式在房间的水平方向和竖直方向均能够达到人们对室内热舒适度的要求,而且火墙的两侧供热面能够同时对室内和门厅供暖,与土暖气相比火墙有较高的热利用效率。 相似文献
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提出了地板辐射采暖双向散热的设计模型,双向散热与传统的地板辐射采暖相比,降低了地板表面温度,楼板平均辐射温度下降,室内空气温度分布更趋合理。同时文中采用预测平均投票指标及预期不满意百分数指标,综合评价采用普通散热器房间、地板辐射采暖房间及双向散热地板辐射采暖房间在不同室内设计温度时的PMV值及PPD值,并对其进行了分析。 相似文献
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《Planning》2020,(1):16-25
基于丽江的气候条件,利用POLYSUN软件对设计的普通建筑太阳能低温热水地板辐射采暖系统进行模拟实验,得到采暖月份的太阳能保证率、水箱温度和系统耗电量.通过对比分析,发现在丽江地区采用太阳能热水地板采暖时,18℃是一个相对合适的房间采暖温度,既能保证房间舒适性又能兼顾经济性与节能性. 相似文献
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低温地板辐射供暖特性参数的研究 总被引:5,自引:0,他引:5
建立了低温地板辐射供暖房间各围护结构的热平衡关系式,计算了地板表面温度、热流密度、室内空气温度和围护结构内表面温度。介绍了计算地板表面温度和围护结构内表面温度的耦合程序,测试了地板辐射供暖房间的特性参数。 相似文献
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水力失调对供暖房间温度影响的分析 总被引:6,自引:2,他引:4
推导出了水流量变化对供暖房间温度的影响以及管路水力失调度允许波动的取值范围,指出循环水量减小时对室温的影响较水量增加时为大。 相似文献
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本文针对含多孔型地板的室内低温地板辐射采暖的传热问题进行研究,采用有限元法求解控制方程,分析了太阳辐射对整个室内空间温度场和速度场的影响,探讨了不同时刻太阳辐射对室内温度场和速度场的影响规律。在保证室内空气温度和速度均达到规范中冬季供暖的舒适性设计值的前提下,再根据温度和速度计算出PMV和PPD的数值,获得不同时刻下所需求的地板辐射热流密度最佳范围。 相似文献
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Space heating load is decreasing in modern Finnish apartments due to lower U-values of the construction, tight envelopes and heat recovery from exhaust ventilation air. This makes it possible to develop a new combined low temperature water heating system with nominal supply/return water temperatures of 45 °C/35 °C. Such a system includes radiators in rooms and floor heating in bathrooms.In this study, the performance of an apartment building is determined by using dynamic simulation. The simulation results for the combined low temperature water heating system are compared with those for three conventional radiator and floor heating systems. The results show that the combined low temperature water heating system performs well and is able to maintain the zones within the required temperature levels. The thermal comfort analysis indicates that the drifts and ramps in operative temperature using the four studied heating systems are within the limits of Ashrae Standard 55-2004.Temperature measurements in a test room are carried out to find the vertical difference of air temperature using two methods: radiator heating and floor heating. These measurements indicate that there is only a small vertical temperature difference that would not produce any significant thermal discomfort. 相似文献
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Thermal comfort aspects in a room vary with different space heating methods. The main focus in this study was how different heating systems and their position affect the indoor climate in an exhaust-ventilated office under Swedish winter conditions. The heat emitters used were a high and a medium–high temperature radiator, a floor heating system and large wall heating surfaces at low temperature. Computational fluid dynamics (CFD) simulations were used to investigate possible cold draught problems, differences in vertical temperature gradients, air speed levels and energy consumption. Two office rooms with different ventilation systems and heating needs were evaluated. Both systems had high air exchange rates and cold infiltration air. 相似文献
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比较分户计量供暖系统热负荷与传统供暖系统热负荷的不同,分析合理确定采暖房间室内设计温度和户间传热负荷应考虑的因素,并给出相关建议。 相似文献