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两种除湿溶液的再生性能对比实验研究 总被引:2,自引:0,他引:2
该文旨在比较LiBr和LiCl溶液的再生传热传质性能。通过搭建的溶液再生实验台,分别采用LiBr和LiCl溶液实验测试了一系列在溶液调湿空调的再生器中常见的工况;整理再生实验数据,针对评价传热传质性能的指标——再生量,拟和了经验公式,通过经验公式可以计算出实验范围内任意工况下的传热传质性能;再生量是衡量传热传质性能的最直观指标,进口参数等效时,LiBr和LiCl溶液的再生量差别很小,在进口溶液浓度较低(LiBr溶液在40%~43%)时,LiCl溶液的再生量较高;而进口溶液浓度较高(LiBr溶液在48%~50%)时,LiBr溶液的再生量略高。 相似文献
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经济器在风冷热泵机组上的应用 总被引:1,自引:0,他引:1
在节能降耗和环保要求越来越高的今天 ,提出了压缩式热泵机组应该采用的环保型压缩机形式是螺杆压缩机 ,从理论上分析了经济器是一个具有明显节能效果的设备 ,值得广泛推广使用 相似文献
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There has been a limited application of liquid desiccant (LD) dehumidification systems in space air conditioning until now. The key elements responsible for this restricted implementation are leakage of desiccant solution, corrosion of components, and solution carryover along with the processed air to the space to be conditioned. To remove these problems, an evacuated tube solar heat collector-driven multichannel liquid desiccant air conditioning system has been proposed and experimentally investigated. In this study, dehumidification and regeneration rate, their effectiveness, cooling effect of the dehumidifier, and indirect evaporative cooling unit have been analyzed. The results obtained indicate that the process air has been dehumidified and cooled by 6.32 g kg−1 and 5.26°C, respectively. The regeneration rate and effectiveness have been obtained to be 0.26 g s−1 and 0.31, respectively. In terms of the cooling effect, the system output of 0.703 and 0.130 kW has been obtained from the dehumidifier and indirect evaporative cooling unit of the system, respectively. The proposed system validates the possibility of the novel solar-powered liquid desiccant air conditioning system concept and provides growth and development of the LD air conditioning technology for space air conditioning. 相似文献
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In this paper, the analysis of silica gel formed in a staggered tube bank arrangement for the reduction of energy consumption in a heat pump dehumidifier is presented. The mathematical models for the desiccant and the heat pump have been developed. The simulated results agree quite well with those of the experiments. The desiccant could reduce the heat pump load by about 7–20 per cent at the inlet air conditions of about 30–50°C and 70–90 per cent RH. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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针对由天气变化导致太阳能利用不稳定和寒冷地区热泵性能低的问题,文章介绍了一种基于相变储能的太阳能空气源热泵系统,该系统能够根据气象情况灵活切换4种供暖模式,大大减少了系统耗电量。文章通过独特设计的储能冷凝器,不仅可以调节太阳能空气源热泵系统能量分配,改善太阳能空气源热泵系统制热量和建筑热负荷之间不平衡的供需关系、提高太阳能利用率,还可以提高空气源热泵低温性能,快速恢复供暖,从而实现提高太阳能空气源热泵系统整体性能的目的。文章以石家庄农村某户为研究对象进行研究,研究结果表明,太阳能空气源热泵系统供暖效果较好,太阳能空气源热泵系统COP最大值为5.19,节能环保效益十分明显。 相似文献
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风冷太阳能双级水喷射制冷空调系统性能分析 总被引:1,自引:0,他引:1
对额定制冷量为12.3 kW的风冷太阳能双级水喷射制冷空调系统进行了变工况性能分析。该系统的制冷量随室内温度升高而增大,随环境温度升高而减小,随太阳辐照度增强而增大;COP的变化与制冷量的变化类似,所不同的是COP随着太阳辐照度的增强先迅速增大,当太阳辐照度增大到一定程度后,COP基本保持稳定。在室内温度不低于27℃,室外温度不高于38℃,太阳辐照度不低于500 W/m2的条件下,系统的制冷量为7.7~32 kW,COP为0.082~0.107。 相似文献
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In this article, an experiment has been carried out with heat pipe vacuum or evacuated tube collector to produce water from atmospheric air. In this experiment, the regeneration and adsorption method has been adopted, that is, water has been produced through the adsorption and regeneration of desiccants. The desiccant is heated through a hot surface to facilitate its regeneration. Limited experiments have been conducted to obtain water through the regeneration of desiccant using a hot surface. For the condensation of water vapor, a novel box has been designed, named the “novel-designed acrylic box.” The water is collected in a measuring flask or beaker to determine its quantity. Silica gel desiccant has been used for the adsorption and regeneration of water vapors. In this experiment, the adsorption process for silica gel was carried out in two different ways. In the first method, 1 kg of silica gel was scattered on the copper tray, that is, inside the system, while in the second method, 1 kg of silica gel was scattered on the paper, that is, outside of the system. In the first case silica gel adsorbed 137 g water vapor, and in the second case, it adsorbed 232 g water vapor. In the first case of adsorption, 70 mL water was produced while in the second case of adsorption, 175 mL water was produced from ambient air. The system's maximum efficiency was found to be 4.9%. Effects of various parameters, such as solar intensity, ambient temperature, wind speed, and so forth, have been studied. 相似文献
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Thermal performance parameters for a solar-assisted heat pump (SAHP) drying system with underground thermal energy storage (TES) tank and heat recovery unit (HRU) are investigated in this study. The SAHP drying system is made up of a drying unit, a heat pump, flat plate solar collectors, an underground TES tank, and HRU. An analytical model is developed to obtain the performance parameters of the drying system by using the solution of heat transfer problem around the TES tank and energy expressions for other components of the drying system. These parameters are coefficient of performances for the heat pump (COP) and system (COPs), specific moisture evaporation rate (SMER), temperature of water in the TES tank, and energy fractions for energy charging and extraction from the system. A MATLAB program has been prepared using the expressions for the drying system. The obtained results for COP, COPs, and SMER are 5.55, 5.28, and 9.25, respectively, by using wheat mass flow rate of 100 kg h−1, Carnot efficiency of 40%, collector area of 100 m2, and TES tank volume of 300 m3 when the system attains periodic operation duration in fifth year onwards for 10 years of operation. Annual energy saving is 21.4% in comparison with the same system without using HRU for the same input data. 相似文献