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为解决寒冷地区冬季空气源热泵运行效率、新风机冻损等运行问题,保证冬季室内良好的空气品质,设计了在冬季将排风引入热泵蒸发器,通过热交换回收排风的能量,并利用热泵冷凝器加热引入室内新风的热泵热回收新风机。采用空气焓差法对该机组在利用排风及排风混室外空气2种运行工况下的制热量、输入功率、热泵能效比(COP)、热回收效率的对比实验。用热泵热回收新风机引进新风后基本没有改变机组输入功率,相同环境条件下的制热量增加,COP值增大,焓差热回收效率最高可达到51.4%。新风机和热泵相结合,利用排风余热提高热泵蒸发器工作温度,改善了热泵和新风机在北方寒冷地区冬季的运行性能。 相似文献
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对在冬季状况下风冷热泵机组置于室内运行的各种条件作了详尽的分析,得到了相对应的热泵机组的运行性能,找到了室内风冷热泵在冬季稳定运行的通风条件。同时,利用实际工程的运行效果对实验结论作了验证。 相似文献
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文章根据昆明卷烟厂联合厂房常年供冷车间空调负荷特点,提出室内空调设计参数全年采用夏季室内状态点,并根据热工计算分析了冬季及过渡季时冷却塔供冷、溴化锂冷水机组供冷、新风线性增加供冷、全新风供冷模式的运行能耗,提出了冬季及过渡季时冷却塔供冷模式能耗最小,最有利于卷烟厂常年供冷车间的节能运行。 相似文献
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藏族民居中采暖与不采暖房间热环境研究 总被引:1,自引:0,他引:1
对香格里拉藏族民居冬季室内的热环境进行了热环境测试,具体对冬季香格里拉藏族民居室内温度、围护结构各壁面温度等参数进行了测试,比较分析,测试结果反映香格里拉藏族民居室内的温度变化现状与特征,该测试结果可为香格里拉藏族民居的热环境改善提供依据. 相似文献
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本文采用数值模拟软件对不同室内外温度条件下的船舶水平及垂直围壁稳态传热进行模拟计算。结果表明水平围壁在冬季和夏季的传热系数存在明显的差异,而且冬季的传热系数要比夏季的传热系数大的多,这主要是水平空气层在冬季的自然对流比夏季的自然对流强烈。垂直围壁冬季和夏季传热系数的差异很小。结果也表明同一季节的室内外温差的变化对围壁传热系数的影响均很小。因此在计算船舶空调负荷时,水平围壁传热系数取值应对冬季和夏季予以区分而垂直围壁的传热系数选取不需区分冬季和夏季。 相似文献
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通过对重庆地区住宅冬季主要供暖方式-壁挂式空调的供暖效果进行实测分析,供暖期间房间内温度分层和新风不足现象明显。针对居民在壁挂式空调供暖期间开窗通风的使用行为习惯对供暖舒适性和能耗的影响,笔者提出了一种适用于重庆地区住宅冬季壁挂式空调供暖与通风协同运行解决方案,并通过数值模拟验证其可行性。该结果可为该地区住宅冬季室内热环境调控提供参考。 相似文献
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我国西北荒漠地带,生态环境脆弱,可持续发展面临巨大的资源和环境压力。以银川市碱富桥村新农村建设为研究对象,科学规划合理设计,依据当地丰富的太阳能资源提出了被动式太阳能新型生态民居设计,新民居综合利用了被动式太阳房、草砖、稻壳板等多种生态建筑技术。建成后对太阳辐射、室内外温湿度、平均辐射温度以及预计平均热感指数PMV等进行了现场测试,对室内热环境的形成原因进行了分析,并对夏季室内通风进行了模拟分析。测试和模拟表明,新民居冬季温暖、夏季凉爽,具有较好的室内热环境质量,对于西北地区新农村建设具有重要借鉴意义。 相似文献
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M.E. Hoffman 《Energy and Buildings》1982,4(3):221-229
The influence of building design on indoor climate is studied using Hoffman and Feldman's Total Thermal Time Constant Method for simulation of the thermal response of a building.Comfort requirements in summer in residential buildings, and the manner in which they can be achieved by appropriate building design in order to improve indoor thermal conditions are discussed.The proper use of insulation and heat capacity properties (represented in this paper by the total thermal time constant of the external elements) and the use of light external colours are very important in eliminating or minimizing the need for air conditioning coolers. The correct design of insulation, and window areas permitting solar radiation penetration, can drastically reduce heating requirements in winter.The incomplete results reported are part of a research in progress on the calibration of ventilation as a source of cooling in summer and of window area (with solar radiation penetration) as a source of heating in winter. 相似文献
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利用Desgnbuilder模拟软件对西部地域九个城市的典型办公建筑在自然通风和非自然通风条件下进行逐时能耗模拟,以节能率和单位面积节能量为指标,结合通风潜力计算结果综合分析各地区的自然通风节能潜力。结果表明各热工分区的自然通风节能潜力大小依次为温和地区、严寒地区、寒冷地区,夏热冬冷地区总体不具备自然通风节能潜力,但是在过渡季节仍有一定的节能效果。 相似文献
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Temperature ranges of the application of air-to-air heat recovery ventilator in supermarkets in winter, China 总被引:5,自引:0,他引:5
Energy consumption is an important issue in China. In heating, ventilation and air conditioning (HVAC) systems, more and more commercial buildings use air-to-air heat recovery ventilators as energy saving units for recovering heat from the exhaust air in ventilation systems in current years. In the present paper, critical temperatures of air-to-air heat recovery systems for supermarkets in winter are recommended and discussed for the four cities in different climate zones of China. The analysis shows that the temperature of fresh air in winter can be categorized into three regions, i.e., recovery region, transition region and impermissible recovery region. The results also indicate that the latent heat recovery is not suitable for ventilation energy savings in supermarkets in winter. Meanwhile, the applicability of sensible heat recovery in supermarkets depends on outdoor climate and fresh air flow rate. If a variable rotational speed fan is used to introduce fresh air into the building, heat recovery does always function as planned in winter for all the selected cities except Guangzhou, and most values of the COP are much higher than 2.5. Otherwise, there is the risk of negative impact on building energy savings in all cities except Harbin. 相似文献
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两种梅州客家传统民居自然通风比较分析 总被引:1,自引:0,他引:1
梅州现存有大量的传统民居,此类建筑冬暖夏凉,具有较好的室内热环境。而通风在岭南亚热带气候条件下对建筑内部的热环境影响很大,本文通过模拟围龙屋和杠式屋这2种传统民居的室内、外通风情况,对不同类型民居的通风效果进行了分析,以期挖掘传统民居利于通风的建筑技术,为岭南民居建筑室内、外热环境的改善提供技术基础。 相似文献
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A great amount of world energy demand is connected to the built environment. Electricity use in the commercial buildings, accounts for about one-third of the total energy consumption in Turkey and fully air-conditioned office buildings are important commercial electricity end-users since the mid-1990s. In the presented paper, the interactions between different conditions, control strategies and heating/cooling loads in office buildings in the four major climatic zones in Turkey – hot summer and cold winter, mild, hot summer and warm winter, hot and humid summer and warm winter – through building energy simulation program has been evaluated. The simulation results are compared with the values obtained from site measurements done in an office building located in Istanbul. The site-recorded data and simulation results are compared and analyzed. This verified model was used as a means to examine some energy conservation opportunities on annual cooling, heating and total building load at four major cities which were selected as a representative of the four climatic regions in Turkey. The effect of the parameters like the climatic conditions (location), insulation and thermal mass, aspect ratio, color of external surfaces, shading, window systems including window area and glazing system, ventilation rates and different outdoor air control strategies on annual building energy requirements is examined and the results are presented for each city. 相似文献
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为了解决长大隧道中如何有效利用竖井自然通风辅助机械通风,提高通风效果、节约能耗,以锦州地下储油洞库群和官田隧道的施工通风为依托,采用理论分析、数值模拟及现场测试对竖井自然通风效应的影响参数进行了研究。研究结果表明,在特定的气温条件下,竖井进行自然通风会对机械通风有辅助的效果;竖井的直径变化对通风的作用影响是比较有限,当竖井的深度在250 m以前时,竖井通风效应随竖井深度的增大而增强。当竖井深度达到250 m后,继续增加深度,其通风效应无显著变化。温差越大,竖井自然通风效果相对越好,冬季利用竖井出风的通风效果要好于夏季利用竖井进风的通风方式;该竖井进风方案的要点在于如何将新鲜的风引入到主洞室,在距竖井的中线5 m处布置风机比较科学合理。 相似文献