共查询到19条相似文献,搜索用时 203 毫秒
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提出了一种新的全空气THIC空调系统,并对其夏季工况进行了研究,给出了新系统能达到的最小热湿比和新风比范围。计算分析了显热或全热回收器迎风面积变化时,对低温表冷器制冷量,以及其单位制冷量除湿量的影响。发现全热回收器才是系统中的关键部件,增加全热回收器的迎风面积可以大幅度减少低温表冷器的制冷量,并在一定迎风面积范围内,快速提升低温表冷器单位制冷量的除湿量。而显热回收器迎风面积变化时的影响很小。 相似文献
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为了研究膜式全热换热器换热效率影响因素,本文采用一种有机超滤膜设计制作了两种新型膜式全热换热器,通过实验分析了迎面风速、温湿度以及通道长度对换热器换热效率及阻力的影响。结果表明,随着迎面风速的减小、温湿度的增大及通风通道长度的提高,换热器换热效率有着不同程度的增加,但通风阻力随着通道长度及风速的增加而增大。这一系列的研究结果为全热换热器的设计和应用提供了依据。 相似文献
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程浩 《建筑热能通风空调》2015,(3):44-48
以R22和R134a两种制冷剂为研究对象,对二者在冬季制热工况下的富余充注量分别应用于空气源热泵热气旁通除霜、显热除霜、过冷放热除霜三种模式中的热量利用率、耗热率以及理论制热系数进行对比研究。结果表明:在控制制冷剂流量的空气源热泵空调系统正常制热运行时,富余制冷剂充注量应用于三种除霜模式都能有效地抑制室外换热器表面的结霜,其中制冷剂过冷放热除霜法最佳,定时除霜时,显热除霜所用时间最短;另外,在三种不同的除霜模式下,R22的热效率均高于R134a,定时除霜时,R134a的除霜时间均少于R22。 相似文献
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热泵驱动的双级溶液调湿新风机组原理及性能测试 总被引:3,自引:1,他引:2
介绍了一种新型热泵驱动的双级溶液调湿新风机组的工作原理和全年运行方式,重点介绍和分析了该机组主要部件的实测性能数据.测试结果表明,双级溶液全热回收单元的全热回收效率和潜热回收效率分别为55%左右,而新风机组在满负荷工况下整机COP为5.0,部分负荷下可超过5.9,其中的热泵制冷系统在满负荷工况下COP为4.01,部分负荷下可超过5.72,溶液热回收板式换热器的显热回收效率在80%以上.测试分析了机组进行新风处理的整体性能,指出了在再生单元补水的重要性. 相似文献
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本文对静止式全热交换器及其机能材料的性能评价试验方法、评价指标进行了探讨。参考国外有关标准,建议全热交换器的评价指标应主要包括全热交换器的显热、潜热和全热效率以及漏气度。对其机能材料的评价应从材料的传热、透湿、透气、阻燃性能等几个方面进行。同时还对实验装置和计算方法提出了建议,希望得到更广泛的讨论。 相似文献
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分析了冷凝器热回收系统的工作原理,证实冷凝热回收既能减少冷却塔的热排放负荷量,又能用以制取生活热水.结合工程实例,通过对在压缩机排气口增加换热器的冷凝热回收系统进行定量分析,在设计工况下,得到了冷凝器中显热和潜热所占的比例,其中,冷凝热的显热部分占总冷凝热的14.2%,液化潜热占80.6%,过冷热量只占5.2%.并且,热水流量和热回收率都随热水的出水温度升高而降低. 相似文献
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转轮全热交换器对空调箱运行能耗的影响 总被引:1,自引:1,他引:0
以浦东图书馆新馆空调系统为例,分析了转轮全热交换器在空调节能方面的作用及其所受的影响:转轮全热交换器在水系统上大大减少了系统运行能耗,新风比以及室内外焓差越大,节能效果越明显。 相似文献
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The thermal performance of an enthalpy/membrane heat exchanger is experimentally investigated. The heat exchanger utilizes a 60gsm Kraft paper as the heat and moisture transfer surface for HVAC energy recovery. The heat exchanger sensible, latent and total effectiveness have been determined through temperature and moisture content measurements. The annual energy consumption of an air conditioner coupled with an enthalpy/membrane heat exchanger is also studied and compared with a conventional air conditioning cycle using in-house modified HPRate software. The heat exchanger effectiveness are used as thermal performance indicators and incorporated in the modified software. Energy analysis showed that an air conditioning system coupled with a membrane heat exchanger consumes less energy than a conventional air conditioning system in hot and humid climates where the latent load is high. It has been shown that in humid climate a saving of up to 8% in annual energy consumption can be achieved when membrane heat exchanger is used instead of a conventional HVAC system. 相似文献
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Efficiency of energy recovery ventilator with various weathers and its energy saving performance in a residential apartment 总被引:3,自引:0,他引:3
The energy recovery ventilator (ERV) is an effective method, which can transfer heat and moisture from the exhaust air into the outdoor fresh air to save energy in buildings. Nowadays, ERV has been widely used in the commercial, industrial and residential buildings in China. Its energy saving performance depends on a lot of factors, such as the outdoor environmental conditions, the enthalpy efficiency of the exchanger, and so on. Based on the relationship among sensible heat, latent heat and enthalpy efficiency, we analyzed the weighted coefficient equations for describing the performance of ERV in different climatic zones in China. According to China weather data, enthalpy efficiency of the exchanger mainly depends on sensible heat efficiency in winter and latent heat efficiency in summer. The energy simulations of a sample apartment in a residential building were made under different operation conditions to study the performance of ERV. The energy saving performances of the ERV were studied with five different outdoor climatic conditions, the enthalpy efficiency, fan power consumption of ERV and fresh air change rate. To improve energy saving performance, better efficient enthalpy exchange material and higher effiencient fans must be explored, while reasonable fresh air change rate as well as proper operation period according to local climate should also be carefully considered. 相似文献
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根据工程实例,对采用新风换气机进行显热回收,将排风中的热量回收,用于加热冬季空调系统新风的系统进行经济技术比较。 相似文献
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某工程土壤源热泵间歇运行的测试研究 总被引:2,自引:0,他引:2
土壤源热泵系统作为一项节能、环保的空调系统方式,目前已得到广泛应用.然而土壤源热泵系统的埋地换热器受土壤物性影响较大,连续运行时热泵机组的冷凝温度或蒸发温度会受土壤温度的影响发生波动,从而导致热泵机组和系统的能效比发生变化.笔者以实际工程为测试对象,重点分析了土壤源热泵系统间歇运行对机组和系统能效比EER的影响,得出在该工程土壤源热泵系统间歇运行测试条件下,机组EER基本稳定在4.5之上,系统EER基本维持在2.5左右,达到了较高的运行效率. 相似文献
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提出对热、湿处理过程进行单独(火用)评价的概念,并构建了相应评价指标.以某一次回风空调系统的典型夏季空气处理过程为例,在热力学极限意义上阐明了对热、湿处理进行单独(火用)评价的实施过程,计算结果表明该空气处理过程的显热(火用)效明显高于潜热(火用)效,潜热(火用)效低下的原因主要在于再热显热(火用)损和冷凝水(火用)损... 相似文献