深冷文献消息(国内部分)

20 0 36 10 1　滚动转子式压缩机传热模拟张华俊等　《低温与特气》　 2 0 0 3　　№ 4　 7～ 9就滚动转子式压缩机的传热特性进行了分析。把压缩机分为 15块 ,视摩擦损失和电机发热为内热源 ,考虑润滑油流动在传热过程中的影响 ,应用集中参数法对每块进行了能量分析 ,建立了传热数学模型并进行了计算。2 0 0 36 10 2　螺杆制冷压缩机噪声解决实例分析邱　琦等　《低温与特气》　 2 0 0 3　　№ 4　 19～ 2 0以LGl6螺杆压缩机噪声解决方案为例 ,简要介绍了压缩机及其机组的主要噪声来源和降低噪声的基本思路 :气路系统中的油分离器 ,往往因…     

热泵压缩机温度场CFD数值模拟与试验研究

热泵压缩机工作过程产生的热交换对压缩机零件以及冷冻油的性能有着非常重要的影响,明确压缩机温度分布情况,有助于整机性能的提升,提高其可靠性。为此,对现有热泵压缩机的传热特性进行分析,建立传热数学模型并进行CFD模拟,得到压缩机腔体内温度分布规律,并对该数值模拟分析方法进行试验验证。     

滚动转子式压缩机模拟与实验研究

对已建立的传热及润滑系统的数学模型进行了模拟计算。对压缩机机壳温度在变工况下进行了测试，并分析了运行工况对压缩机温度分布的影响。经实验初步验证，模型计算结果与实验值基本吻合，证明模型是可靠的。     

使用HFC134a的冰箱用旋转式压缩机性能优化的途径

冰箱用旋转式压缩机中用ＨＦＣ１３４ａ替代ＣＦＣ１２后，由于ＨＦＣ１３４ａ的热力学与传输特性不同于ＣＦＣ１２，使压缩机的性能下降。本文从旋转式压缩机的电机效率、隙容积、传热损失及润滑油粘性等途径来探讨改进ＨＦＣ１３４ａ旋转式压缩机的途径。     

冰箱用HFC134a旋转式压缩机的进气管绝热设计方法

分析了进气管的绝热改进是传统的冰箱用旋转式压缩机使用ＨＦＣ１３４ａ制冷剂时提高性能的一种有效方法；建立了进气管绝热设计的传热模型；介绍了旋转式压缩机使用新制冷剂ＨＦＣ１３４ａ后进气管的绝热设计方法和算例。     

带负载冷柜运行模拟及实验研究

对一台１２８Ｌ家用冷柜进行了动态运行模拟和实验研究。提出了热力系统的两个计算区域之间，通过质量传递或热量传递耦合起来，对所研究的系统，传热，传质分别采用热流量和压力作为耦合变量。传质边界为毛细管，压缩机，传热边界为各物理边界，模拟了带负载冷柜的运行过程，提出一种简单有效的方法计算带压仓负荷的开机过程，能大大节省计算时间，并用实验验证了数值模拟结果。     

全封闭制冷压缩机的热管冷却技术

一、引言改善压缩机的冷却过程作为提高制冷系统热力效率的重要途径,一直受到人们的关注,然而,由于客观条件的限制,以往对全封闭制冷压缩机进行冷却的主要目的在于保证其工作的可靠性和耐久性。近年来,热管传热技术在制冷技术方面得到了应用,热管     

新型水平预压式垃圾压缩机的轻量化设计

本文从垃圾处理工艺出发，结合工程试验，研究了压缩机工艺参数对垃圾压缩密度的影响，确定了本压缩机的压缩工艺流程。在此基础上，完成了水平预压式垃圾压缩机的结构设计；利用ANSYS软件对压缩机的关键结构进行有限元分析，得出了关键结构的应力分布；结合有限元分析结果，对压缩机关键结构进行优化，完成了水平预压式垃圾压缩机的轻量化设计。     

传热不可逆回热式布雷顿制冷机分析

用有限时间热力学方法分析实际隐态制冷装置性能，导出了恒温和变温热源条件下实际闭式回热式布雷顿制冷循环制冷率与压力比和制冷系数与压力比之间的解析关系。考虑了不可逆性包括高，低温侧换热器和回热器的不可逆传热损失，压缩机和膨胀机中的非等熵压缩和膨胀损失，以及管路系统中的压力损失，通过优化两个换热器和回热器之间的热导率分配或传热面积分配可得循环最优性能，由数值算例给出了各项损失对循环制冷率和制冷系数的影响。     

滚动转子工压缩机润滑系统计算

润滑油循环系统对压缩机内的热交换和温度分布有很大影响，对压缩机的润滑系统进行了分析，得到各摩擦副的供油量，分析了间隙和粘度等参数对压缩机性能的影响，建立了数学模型，为压缩机设计间隙和选用润滑油提供依据。     

换热因素对空气源热泵热水器压缩机运行范围影响探讨

简要分析空气源热泵热水器系统运行对压缩机运行范围的影响,由于换热特性和热泵系统热力特性的限制,在低温运行条件下,冷凝温度将不超过65℃;而提高压缩机蒸发温度上限的措施,仍然不能免除在夏季运行采取防止蒸发温度过高的措施.在技术措施正确的前提下,空调压缩机可以满足空气源热泵热水器的应用要求.本文指出,我国标准中规定20℃为空气源热泵热水器额定运行进风温度是不合理的,客观上对行业发展产生了不良影响;目前市场上存在的产品质量问题,主要原因是受标准的影响和系统设计的技术措施不当,并非压缩机性能问题.     

A numerical model for thermal mapping in a hermetically sealed reciprocating refrigerant compressor

In a refrigerant compressor, improvement in performance such as reduction of various electrical and mechanical losses, reduction of gas leakage, better lubrication, reduction of suction gas heating etc. can be achieved by maintaining a low temperature rise inside the compressor. Proper selection and location of an internal over load protector relay, estimation of heat transfer coefficient and winding insulation coefficient are also vital in enhancing the performance. In this context it is necessary to understand the temperature distribution inside a compressor for an optimal design. In this paper, a numerical model has been created and a heat transfer analysis for a hermetically sealed reciprocating refrigerant compressor is presented. The temperature distribution inside the compressor has been obtained taking into consideration the various heat sources and sinks and compared with experimental results. The maximum temperature was observed at the rotor which was 427.5 K. The deviation of the predicted rotor temperature from that of experimental value is 5.5% only. A good agreement was found between experimental results and that predicted in the numerical analysis.     

转子压缩机与涡旋压缩机的对比与发展

空气源热泵压缩机的性能是适合不同气候条件的热泵的关键。本文回顾了转子与涡旋压缩机的发展历程,早期房间空调器用压缩机为活塞式,后期出现了转子压缩机和涡旋压缩机,压缩机效率得以提升。转子式压缩机和涡旋式压缩机均向适应低环境温度工况的方向发展。介绍了影响这两种压缩机发展的关键技术,改进电机与压缩机的结构来提升压缩机效率,通过变压比、喷气增焓、部分负荷下调节等技术,提升了压缩机系统性能系数COP与综合部分负荷性能系数IPLV(H)。采用直流电机替代交流电机,可提高两种压缩机的电机效率和频率调节范围。通过对涡旋压缩机进行不对称涡旋盘设计,可减小噪音与泄漏量;对转子压缩机的双转子进行对称布置,增大了压缩机的容量。带排气阀的涡旋压缩机可在一定程度上实现变压缩比,而转子式压缩机有排气阀,在变工况方面具有明显的优势。两种压缩机均可采用喷气增焓技术,实现热泵低环境温度较大的压缩比。     

涡旋式水源热泵系统性能仿真

为了预测涡旋式水源热泵系统变结构和变工况稳态性能,建立了稳态涡旋式热泵系统仿真模型.其中涡旋式压缩机模型考虑了吸、排气换热对工质流量和排气温度的影响以及流量、排气温度和输入功率三者的耦合关系;通过增加电子膨胀阀开度对蒸发器出口过热度的控制模型,反映了过热度对膨胀阀流量的影响.系统算法综合了顺序模块法和连续迭代法,改善了迭代收敛性,且易于实现部件模型的模块化.与实验结果对比表明:模型预测值与实验值的误差小于4.4％.     

An investigation of the performance of a scroll compressor under liquid refrigerant injection

In this study, fundamental and practical influence of liquid refrigerant injection on the performance of a refrigerant scroll compressor has been investigated experimentally and theoretically. In the theoretical analysis, a compression model of vapor/liquid mixture is developed by taking account of heat transfer from the cylinder wall to suction, compression and injection refrigerant. An experiment has been done under the condition of keeping the oil temperature constant in order to investigate the fundamental influence of the liquid refrigerant injection on the compressor performance, and the results were compared with the theoretical ones. It was found that the injection basically increases the compression power and decreases the compressor efficiency, though the situation depends on the condition of the heat transfer to the injection refrigerant. And furthermore, the performance of the liquid refrigerant injection compressor under practical operating condition without controlling the oil temperature has been investigated. Under this condition, the compressor showed recovery and slight improvement of performance due to the decrease of the oil and cylinder temperatures by the injection. In addition, influence of the refrigerant injection on the oil viscosity and refrigerant solubility in the oil, which relate mechanical loss and reliability of the compressor, have been discussed.     

A novel linear electromagnetic-drive oil-free refrigeration compressor using R134a

A new type of oil-free moving magnet linear compressor with clearance seals and flexure springs has been designed for incorporation into a vapour compression refrigeration system with compact heat exchangers for applications such as electronics cooling. A linear compressor prototype was built with a maximum stroke of 14 mm and a piston diameter of 19 mm. An experimental apparatus was built to measure the compressor efficiencies and coefficient of performance (COP) of a refrigeration system with the linear compressor, using R134a. The resonant frequency for each operating condition was predicted using the discharge pressure, suction pressure and stroke. Refrigeration measurements were conducted for different strokes under each pressure ratio with a fixed condenser outlet temperature of 50 °C and evaporator temperature ranging from 6 °C to 27 °C. The results show that the COPs are around 3.0 for tests with a pressure ratio of 2.5 (evaporator temperature of 20 °C).     

A lumped-parameter thermal model for scroll compressors including the solution for the temperature distribution along the scroll wraps

A lumped-parameter thermal model is presented to predict the temperature in different chambers and components inside scroll compressors with particular attention to gas superheating in the suction process. Thermal resistances between the components are based on global heat transfer conductances, whereas conduction heat transfer through the scroll wraps is solved via a one-dimensional finite volume method. The thermal model was coupled to a thermodynamic model of the compression cycle and then applied to simulate the compressor performance under different conditions of speed and pressure ratio. The model was able to correctly predict the compressor temperature for operating conditions within the range of those adopted for its calibration. The results showed a strong coupling between the compressor thermal profile and the temperatures of the motor and lubricating oil. It has also been found that heat conduction through the scroll wraps reduces slightly the discharge temperature.     

水源热泵机组压缩机的变工况特性研究

本文通过对水源热泵机组压缩机的热泵循环过程的分析，导出了压缩机制热量、耗功量和制热系数与蒸发温度及冷凝温度之间的函数关系，对热泵工况下压缩机的调节控制和选择具有一定的指导意义，也为今后进一步研究水源热泵机组的变工况特性及节能奠定了基础。     

Performance improvement of air source heat pump using gas-injected rotary compressor through port on blade

Gas injection has been a crucial technology to avoid the serious degradation of air source heat pumps in low ambient temperature. A novel injection structure on the blade for rotary compressors has been put forward in previous research to overcome the drawback of traditional injection structures. Based on a verified numerical model, the thermodynamic performance of an air source heat pump with the new gas-injected rotary compressor is investigated. The results indicate that, compared to the air source heat pump with the regular single-stage rotary compressor, the proposed injection structure can enhance heating capacity and COP of the air source heat pump by 23.1–28.2% and 4.5–8.1%, respectively.