蒸气压缩式制冷循环制冷剂的热力优值评价

虽然热电制冷和蒸气压缩式制冷产生制冷效应的方式不同,但是热电材料在热电制冷中的作用相当于蒸气压缩式制冷循环中的制冷剂。在热电制冷中,将在研究其制冷系数的过程中导出的"热电优值"作为评价热电材料性能的指标。类似地,本文通过建立蒸气压缩式制冷循环的制冷系数的解析式,导出制冷剂的"热力优值",将其作为制冷剂热力性能的评价指标,并计算常用制冷剂的"热力优值"。     

双级溴化锂制冷循环中间压力的计算机模拟

通过分析中间压力对双级溴化锂制冷循环热力系数的影响，提出了最佳中间压力的计算方法。这样可简化和优化双级溴化锂制冷循环的热力计算，使其获得最高热力系数，并为运行操作提供一个中间压力的参考值。     

回热式低温制冷机循环理论研究

通过对卡诺循环以及由两个等温过程和两个多变过程组成循环的分析和研究，从理论上证明由两个等熵过程和两个多变过程组成的热力循环（在相同的当量温限下），能够达到与卡诺值相等的热力学效率，并由此得到了一些低温制冷机理想回热循环的热力学效率，采用改进型布雷顿循环（由两个等温和两个等压过程组成）和GM循环对脉管制冷机循环进行了研究，给出了与卡诺循环有关的循环图谱及各种回热制冷特刊 的理想热力效率比较图。     

R134a制冷理想循环热力计算

给出了Ｒ１３４ａ的制冷理论循环性能计算资料，公式及计算结果，给出了压力比，单位制冷量及热力性能系数对蒸发温度和冷凝温度的关系曲线，并进行了分析，可供设计和研究采用这种工质的制冷设备之用。     

R410A制冷剂和POE VG 68润滑油混合物热物性模型

含油制冷剂的热物理性质是准确计算制冷系统热力性能及评价润滑油对换热和压降影响的基础。给出了基于实验的适用于R410A制冷剂，POE VG68润滑油新型工质对的热物性计算方法。这些物性计算模型简结、可靠，模型对物性参数的预测值与实验值的偏差均在5％以内，所有计算模型可用来计算R410A/POE VG68新型工质对在常见工况范围内的物性数据，为R410A制冷空调系统性能设计及分析提供了准确、可靠的热力学参数，同时可用于分析评价R410A制冷系统中润滑油不同循环量对系统及其主要部件性能的影响。     

吸气温度对HFC—134a制冷热泵循环性能的影响

本文根据国外最新资料,给出了ＨＦＣ－１３４ａ热力学性质计算方程和制冷泵循环的计算公式,并编制以及对ＨＦＣ－１３４ａ热力学性质进行了计算,并对不同吸气温度的制 循环性质进行了计算与分析。     

家用冰箱制冷循环的热力学第二定律分析

本文从热力学第二定律出发。给出了制冷循环的熵分析方法;分别以HFC—134a和CFC—12作为制冷工质。讨论了家用冰箱制冷循环的不可逆性;并根据熵分析结果,计算了循环的性能系数,与性能系数的理论值进行了比较。     

吸收式制冷循环特性的稳态模拟

对溴化锂水溶液的热力性质进行模拟，得到较为精确的确定溴化锂水溶液热力参数的计算方法，为溴化锂吸收式制冷循环系统的模拟奠定基础。编制吸收式制冷机组循环模拟程序，对溴化锂吸收式制冷循环的单效及双效并联进行模拟，通过对比试验数据与模拟结果，发现模拟能够取得较为理想的结果。     

新工质用于制冷循环的热力计算

本文计算了４５％环丙烷／５５％１－丁烯在制冷循环中的热力数据，提出了一种计算新工质热力 参数的计算方法。     

氟利昂制冷循环的热力计算程序

作者在“氟利昂热力性质通用计算程序”的基础上,进一步解决了适用于12种氟利昂的单级压缩式制冷循环的热力计算程序问题。对于理论循环、输入计算机的数据仅为冷凝温度、蒸发温度、吸汽过热度及节流阀前过冷度。对于实际循环,尚需输入少量必需的数据。计算机输出为理论制冷循环各关节点的热力性质,以及循环的各种特性数据。运用计算机不仅大大提高了计算速度,而且能获得精确的数值解答。本文还介绍了采用全封闭压缩机制冷循环热力计算的新途径。     

吸附式制冷循环的分析

以吸附式制冷循环的热力过程为依据，使用火用分析的方法对连续回热循环做了分析，对循环中各部分火用损进行了比较。指出了连续回热循环中火用损的主要部位，并探讨了回热率及吸附床的传热性能对循环火用效率的影响。     

A combined double-way chemisorption refrigeration cycle based on adsorption and resorption processes

An innovative combined double-way chemisorption refrigeration cycle based on adsorption and resorption processes is presented. Two different reactive salts were used as sorbents and ammonia was utilized as the refrigerant in the proposed cycle. The useful cold was obtained from the evaporation heat of the refrigerant during the adsorption process and from the reaction heat of the low-temperature salt during the resorption process. The proposed combined double-way cycle has a distinct advantage of higher coefficient of performance (COP) in comparison with conventional adsorption cycle or resorption cycle. Experimental verification indicated that the advanced combined double-way cycle is feasible for refrigeration application, and the ideal COP of the basic cycle was about 1.24. Theoretical results showed that the proposed combined double-way cycle could improve COP by 167% and 60% when compared with conventional adsorption cycle and resorption cycle, respectively.     

Mass recovery adsorption refrigeration cycle—improving cooling capacity

The study investigates the performance of two-bed, silica gel-water adsorption refrigeration cycle with mass recovery process. The cycle with mass recovery can be driven by the relatively low temperature heat source. In an adsorption refrigeration cycle, the pressures in adsorber and desorber are different. The chiller with mass recovery process utilizes the pressure difference to enhance the refrigerant mass circulation. Cooling capacity and coefficient of performance (COP) were calculated by cycle simulation computer program to analyze the influences of operating conditions. The mass recovery cycle was compared with conventional cycle such as the single stage adsorption cycle in terms of cooling capacity and COP. The results show that the cooling capacity of mass recovery cycle is superior to that of conventional cycle and the mass recovery process is more effective for low regenerating temperature.     

Performance evaluation of combined adsorption refrigeration cycles

This paper presents the results of an investigation on the performance of combined adsorption refrigeration cycles. The novel combined cycle amalgamates the activated carbon (AC)-R507A as the bottoming cycle and AC-R134a cycle as the topping cycle and deliver refrigeration load at as low as −10 °C at the bottoming cycle. The cycle simulation is based on the experimentally confirmed adsorption isotherms, kinetics and isosteric heat of adsorption data for R134a and R507A on highly porous based activated carbon of type Maxsorb III. The optimum cooling capacity, coefficient of performance (COP) and chiller efficiency are calculated in terms of cycle time, switching time, regeneration and brine inlet temperatures. Results show that the combined adsorption cycles are feasible even when low-temperature heat source is available.     

双效双重热化学吸附制冷性能实验研究

建立了基于吸附-再吸附原理和内部回热技术的双效双重热化学吸附制冷实验系统,对其可行性及工作性能进行了实验研究。测试结果表明:双效双重热化学吸附制冷热力循环技术用于制冷空调领域是完全可行的,在每次循环过程中由外界热源输入一次高温解吸热可实现四次冷量输出;当采用NiCl2为高温盐吸附剂、MnCl2为中温盐吸附剂、BaCl2为低温盐吸附剂、NH3为制冷剂时,在加热温度为265℃、制冷温度为15℃、冷却温度为30℃的工况下,双效双重热化学吸附制冷循环的COP达到1.1。在此基础上分析了吸附制冷阶段和再吸附制冷阶段冷量输出过程的制冷功率变化特性,发现再吸附过程吸附反应强于吸附反应。     

燃料电池汽车余热驱动吸附制冷系统方案研究

使用环保型制冷工质和节能是汽车空调发展的必然趋势，燃料电池汽车余热驱动的吸附式制冷系统正好符合这一趋势。本文通过综合比较，选择活性炭-甲醇工质对作为吸附工质对，采用两床连续回质循环方式，并初步确定了燃料电池汽车余热驱动的吸附式制冷系统方案。     

连续回热型活性碳－甲醇吸附式制冷循环研究

概述了吸附式制冷技术的最新发展，讨论了连续回热型活性碳－甲醇吸附式制冷循环的分析方法，并对其ＣＯＰ进行了计算机模拟计算。     

沸石吸附式制冷技术的研究进展

综述了国内外沸石分子筛吸附式制冷技术的研究进展,主要包括沸石分子筛制冷的特性、研究现状及存在问题,并介绍了今后的研究重点和方向。     

Thermodynamic study of a combined double-way solid–gas thermochemical sorption refrigeration cycle

A combined double-way thermochemical sorption refrigeration thermodynamic cycle was proposed and tested. Both adsorption refrigeration and resorption refrigeration processes were combined in order to improve the system performance. Two different consolidated composite materials were used as the reactive sorbents and ammonia was used as the refrigerant. Experimental results showed that a system operating with such proposed cycle can have two useful cold productions during one cycle at the expense of only one heat input at high temperature. The average specific cooling power (SCP) during the adsorption refrigeration phase was 301 W kg^?1. Analysis of the experimental data showed that the driving equilibrium drop during the resorption process was much lower than that during the adsorption process, when the cold production temperature was similar. The proposed combined double-way sorption cycle has a larger cooling capacity per unit of heat input and the maximum theoretical coefficient of performance (COP) is 1.24 when MnCl₂ and BaCl₂ are used as the reactive sorbents.     

以硫化石墨为吸附剂基质的再吸附制冷性能分析

相比于传统的吸附式制冷,再吸附制冷作为一种新型的制冷方式,其结构更加简单,并且其制冷性能系数也比相同条件下的吸附式制冷系统要高,故有较好的应用前景。但受到吸附剂的传热传质性能的限制,难以实现高效的再吸附制冷。本文利用硫化石墨作为吸附剂的基质,对其导热系数以及渗透率进行了测试比较,优选吸附剂。并且针对再吸附制冷系统建立了相关数学模型,分析不同工况条件下吸附剂工质对的性能。对整个再吸附制冷过程进行模拟仿真,从而得到不同工况下的制冷性能。结果表明,采用新型复合吸附剂的再吸附系统,COP最大可达到0.3以上,SCP最大可达到161 W/kg。