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太阳能压缩-喷射二级制冷系统的运行工况分析 总被引:1,自引:0,他引:1
压缩-喷射二级制冷系统的COP较传统的喷射制冷系统的COP提高了20%~50%.本文分析了发生温度、中间温度、冷凝温度、蒸发温度对以太阳能为热源的压缩-喷射二级制冷系统的运行工况的影响.结果表明,在综合考虑技术和经济的前提下,应尽可能地提高系统运行的发生温度,降低冷凝温度,中间温度的选择应兼顾集热器的面积和系统的性能系数. 相似文献
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为解决R134a-DMF吸收式制冷系统吸收器出口出现制冷剂(R134a)气体问题,提出R134a-DMF吸收-压缩复合式制冷系统,利用压缩机回收制冷剂气体。基于Aspen Plus软件,选取PENG-ROB物性方法,搭建复合式制冷仿真系统。将蒸发器负荷、热驱动性能系数、节电率作为复合式制冷系统性能评价指标。保持其他设定参数不变:在不同冷凝温度下,分析发生温度对系统性能评价指标的影响;在不同R134a质量分数(吸收器出口气液混合物中)下,分析吸收温度对系统性能评价指标的影响。当冷凝温度不变时,随着发生温度升高,蒸发器负荷、节电率增大,热驱动性能系数减小。当发生温度不变时,随着冷凝温度降低,蒸发器负荷、热驱动性能系数、节电率均增大。当R134a质量分数不变时,随着吸收温度升高,蒸发器负荷增大,热驱动性能系数、节电率减小。当吸收温度不变时,随着R134a质量分数增大,蒸发器负荷增大,热驱动性能系数、节电率减小。 相似文献
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通过对NH_3/空气复叠式制冷在冷凝温度为40℃、冷间要求为-35℃下的速冻制冷循环热力计算,通过改变复叠式制冷系统的氨蒸发温度,得到不同状态参数的复叠式制冷系统COP,与NH_3完全中间冷却双级压缩制冷系统作COP比较,找出复叠系统制冷系数开始优于双级压缩的高温极蒸发温度范围,并提出NH_3/空气复叠式制冷可减少注氨量。 相似文献
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蒸汽喷射式制冷系统可以采用太阳能、地热、废热等为驱动热源,以水等低沸点的环境友好工质为介质,不仅可节约大量的电能,而且还保护了环境。针对太阳能喷射式制冷系统中微小型喷射器的设计和运行问题,本文试验研究了微小型喷射器的运行参数和结构参数对喷射性能的影响,为微小型喷射器设计和运行提供了指导。 相似文献
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蒸气压缩式和溴化锂吸收式制冷系统能量经济性比较 总被引:3,自引:0,他引:3
利用能量分析和经济分析相结合的方法,对蒸气压缩式和溴化锂吸收式制冷系统进行了分析比较。结果表明,蒸气压缩式制冷系统的一次能源能效比普遍高于溴化锂吸收式制冷系统,直燃型溴化锂吸收式制冷系统的单位冷量成本较其它系统相对要高。 相似文献
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The vapour absorption refrigeration system is not so much used commercially because of its low performance. The performance of an absorption refrigeration system is required to make it an efficient alternative of vapour compression refrigeration systems. This paper reviews different research on modification of absorption systems contributing to enhance the performance of absorption refrigeration systems. This study suggests that the performance of absorption refrigeration is improved by using double-effect and semi-generator absorber solution heat exchanger arrangement. The coefficient of performance of absorption refrigeration is also improved by the combination of different refrigeration cycles (hybrid refrigeration cycle) such as compression–absorption and ejector–absorption.Abbreviations: COP: coefficient of performance; GAX: generator absorber solution heat exchanger; ARS: absorption refrigeration system; ECOP: ecological coefficient of performance; CAHP: compression-assisted absorption heat pump 相似文献
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In this study, improvement was made for the solar-electric compression refrigeration system by incorporating the ejector design to a conventional vapour compression chiller within the system. Through year-round dynamic simulation, the performances of the ejector-assisted vapour compression chiller (EAVCC) were evaluated under the intermittent and changing supply of solar energy in the subtropical climate. In addition, the effect of three common refrigerants, R22, R134a and R410A on the EAVCC was assessed and compared. It was found that the coefficient of performance of the chiller was increased and the total primary energy consumption of the system was decreased for all the three refrigerants, in which the degree of enhancement from R134a was the most significant. It was also noted that the effect of R410A on EAVCC was not apparent, and the overall system energy improvement was marginal. With appropriate ejector design and refrigerant selection of the solar-electric compression refrigeration system, the reduction potential of year-round primary energy consumption could be more than 5%. This would be certainly helpful in promoting the application of solar air-conditioning for building use in the subtropical climate. 相似文献
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热经济系数对制冷方式选择的影响 总被引:4,自引:0,他引:4
提出一种对用能系统进行热经济性决策的热经济系数法,探讨了其对制冷方式选择的影响,并定理分析了酒店总能系统方案较之其他制冷方案的优越性。 相似文献
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利用有限时间热力学分析了变温热源制冷循环性能,计入了工质与高低温侧换热器的热阻损失,热源之间的热漏损失及工质内部耗散的不可逆损失。在给定制冷率条件下,推导出最大性能系数和高低温侧循环工质温度的解析式,通过数值计算,分析了各不可逆损失对循环性能的影响。 相似文献
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在分析传统空调制冷系统设计软件存在的不足的基础上,开发了一种具有智能学习功能的空调制冷设计软件,该软件分为负荷计算、湿空气热物理性质计算、气流组织计算、风管系统设计计算、水系统计算、制冷系统热力计算、空调制冷设备选型和工质热物性查询等八大模块,对这些模块的设计思路、结构、功能和开发的定位范围进行了详细介绍。 相似文献