共查询到18条相似文献,搜索用时 46 毫秒
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提高低温制热量是小型家用空调器技术的一个难点,除霜带来的热量损失是低温制热量损失的一个重要方面。对小型家用空调器的除霜技术的发展进行了分析和总结,对小型家用空调器提出了一些新的除霜方式,对提高空调器的低温制热量、使用性能有重要意义。 相似文献
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基于已有典型工业挥发性有机物甲苯设计的一套冷凝法回收系统,对其进行数值模拟和优化设计。运用物性软件REFPROP对甲苯负荷及制冷系统性能进行了模拟。通过对系统的模拟计算,研究了冷却级蒸发温度、冷凝温度以及甲苯混合气体入口温度对该冷凝法甲苯回收系统的性能影响,并针对冷却级温度影响进行了经济性分析。在此基础上,提出了冷量回收的优化方案,并与原有方案进行了对比分析,为进一步优化设计提供了理论依据。优化结果表明:系统预冷级负荷降低69.6%,系统的能耗降低38.9%,COP增大61.4%,压缩机排气温度下降7.7℃。 相似文献
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为实现对新建机械通风冷却塔水蒸气深度回收,提出了自由空间型冷却塔(FSCT,Free Space Cooling Tower)概念,基于新建机械通风冷却塔的空间结构设计了FSCT水蒸气冷凝回收装置结构模型,并建立装置设计数学模型。构建水蒸气冷凝回收装置设计软件流程,基于C++Builder 6.0耦合水物性数据库开发了FSCT水蒸气冷凝回收装置设计软件。在不影响机械通风冷却塔正常运行的情况下,实现水蒸气深度回收。研究结果为新建机械通风冷却塔减少蒸发损失、水蒸气冷凝回收装置设计和计算软件开发提供理论基础和工具性软件支持。 相似文献
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Experimental and numerical study on aeroacoustic sound of axial flow fan in room air conditioner 总被引:1,自引:0,他引:1
Cai-ling Jiang Jiang-ping Chen Zhi-jiu Chen Jie Tian Hua OuYang Zhao-hui Du 《Applied Acoustics》2007,68(4):458-472
Fan is one of the main noise sources of the room air-conditioners. Axial flow fans are widely used in the outdoor unit of split type air-conditioners. The interaction between the fan and the heat exchanger should be taken into consideration. However, only a few researches have been carried out on predicting the aeroacoustic noise because of the difficulty in obtaining detailed information of the flow field. This paper is to understand the generation mechanism of sound and to develop a prediction method for the flow field and the acoustic pressure field of the outdoor unit. Acoustic measurement is performed in a semi-anechoic chamber. Effects of each components is analyzed. Based on commercial computational fluid dynamics (CFD) code, Fluent, Fukano’s model is used to predict the overall sound pressure level of broadband noise. The predicted sound pressure levels based on original Fukano’s model are 7.66 dB and 7.42 dB lower than measurement results at 780 rpm and 684 rpm, respectively. And the errors are about 13%. However, when wake width and relative velocity are both calculated by numerical simulations and the distance to blade trailing edge is taken into consideration, the difference of sound pressure level between measurement and prediction is less than 3.4 dB and errors less than 5.5% while the distance is less than 10 mm. Thus, the distance to blade trailing edge should also be an important parameter for Fukano’s model. In comparison with experimental results, it is clearly shown that the Fukano method based on numerical simulation can provide more accuracy than the original Fukano model and numerical results are in a reliable level. 相似文献
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This article presents the investigation of the charge optimization of a split air conditioner designed for R22 but charged with R290 as an ecofriendly alternative. Initially, a baseline test was conducted with R22 as the refrigerant. R290 was then charged, and the refrigerant quantity, capillary tube, and condenser tube optimizations were done based on a simulation study while other parameters were unchanged. Experimental results show that with propane, the optimum charge quantity of 320 g (35.5%) gives a refrigerating capacity of 4.93 kW, while 4.85 kW was observed as the refrigerating capacity in the baseline test with R22. 相似文献
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为探究热泵供水温度对CO2空气源热泵系统性能的影响,保持室外环境温度15.5℃不变,调节热泵供水温度,测试冷却水流量、气冷器出水温度、压缩机排气温度、气冷器CO2进出口温差、压缩机排气压力、压缩机耗功量、系统制热量、气冷器热交换完善度、系统COP的变化情况。结果表明:供水温度由45℃升至85℃,气冷器出水温度、压缩机排气温度、气冷器CO2进出口温差、压缩机排气压力随之增加,冷却水流量随之减小。系统制热量增加了7.3%、气冷器热交换完善度下降了20.0%、系统COP下降了35%、压缩机功耗增加了65.1%。 相似文献