The capillary tube is often served as an expansion device in small refrigeration and air-conditioning systems. In this paper, a generalized correlation for predicting the refrigerant mass flow rate through the adiabatic capillary tube is developed with approximate analytic solutions based on the extensive data for R12, R22, R134a, R290, R600a, R410A, R407C, and R404A, in which a homogeneous equilibrium model for two-phase flow is employed, and there is a subcooled liquid or saturated two-phase mixture at the inlet of the capillary tubes. The collected database about capillary tubes covers the inner diameter from 0.5mm to 2mm, the tube length from 0.5m to 5m, the condensing temperature from 20℃ to 60℃, the subcooling from 0℃ to 20℃, and the quality from 0 to 0.3 at the inlet. Assessments for the correlation are made with some experimental data for R12, R22, R134a, R290, R407C, R410A, and R404A obtained from the open literature and some existing correlations based on the experimental database also. The present correlation yields an average deviation of -0.83% and a standard deviation of 9.02% from the database.

The leakage is unavoidable and has considerable influence on the performance of a scroll compressor. In a meso-scale scroll compressor, the working gas leakage is more serious because the gaps between the scroll plate pairs are more difficult to be sealed than the case in a normal scale scroll compressor. This paper analyzes the leakage and related factors with a simplified model, and discusses the performance that resulted from gas loss due to both leakages from tangential and axial directions in meso-scale compressors. The discussion and related results are helpful to determine some key parameters in the design and manufacture of meso-scroll compressors.

讨论了微小型化的直线电机驱动的活塞压缩机特性。运用电磁场有限元方法对直线电动机电磁场模型进行求解，分析了电动机内部的磁场和磁力线分布情况；建立了电动机动子动力学模型和驱动电路模型，得到系统的运行方程组并对其求解，根据计算结果对压缩机的驱动力、活塞行程、绕组电流和频率特性等进行了分析，同时就余隙容积和泄漏对这种微小型活塞压缩机的影响进行了探讨。结果表明直线电机驱动的微小型活塞压缩机在理论上是可行的，有进一步研究、优化的必要。

设计了一个可控制制冷剂流量、压力和温度等实验工况的微通道换热器相变流动与换热的可视化实验平台，对R134a制冷剂流经微通道换热器进行了冷凝换热实验研究。试验测量了小质量流率下的R134a制冷剂在多个饱和状态工况下的冷凝换热性能，涉及质量流量、进出口压力和温度等参数。实验分析了传热系数与雷诺数的关系，与Koyama的关联式预测比较接近。分析了摩擦系数随雷诺数的变化，与H L Mo和Wu&Little方程计算得到的数值相近。

混合动力电动车用电源的热管理问题对车辆在各种环境下的运行性能有至关重要的影响。着重从电池散热的角度详细介绍了目前电动车用蓄电池冷却措施的研究、应用和发展状况。提出混合动力电动车电源热管理的一个发展方向是将电池内部传热特性和外部散热过程耦合分析，研制更为有效的冷却方式。

利用均相模型对微通道两相换热器（蒸发器、冷凝器）进行模拟，通过制冷工质R134a热力状态及参数的计算模拟换热器设计工况下的稳态情况。首先建立换热器仿真模型，得出设计工况下的换热器设计结果，然后此基础上，着重分析当外界温度、进出口状态以及质量流量发生变化时，相应的换热器性能参数变化情况，以及相关影响因素。

本文简单介绍了微型摆式发动机的结构和运行原理，并建立了描述其循环运行的零维模型，在此基础上，比较了理想循环与摩擦力影响较大的循环特征差异，分析了运行中摩擦力对循环运行的影响规律，相关的分析和结论可为此类发动机的优化设计提供参考。

结合实验数据和理论分析，建立了D型镍氢电池的传热模型。用该模型对电池的充放电过程进行模拟，并且给出了电池内部的温度分布。与实验测量值比较，两者结果吻合较好。该模型相应的模拟为进一步研究电池的发热特性、改善其温度性能提供了有益参考。

The impact of gaseous refrigerant flowing resistance on the adsorption refrigeration cycle is analyzed with a recently developed model. The resistances mentioned in this paper are produced from two gas flow pipe lines, from the adsorber to the condenser and from the adsorber to the evaporator respectively. They make the pressures in adsorbers during adsorption and desorption different from the evaporating and condensing pressures respectively as normally assumed in theoretical cycles. In a continuous adsorption refrigeration cycle, the pressure drop leads to a considerable reduction in cycle performance. According to simulation results, the flowing resistance from the adsorber to the evaporator should be taken into account even more, and is the main factor affecting the cycle performance. The analysis method and results in this paper are helpful to analysis and optimum design of adsorption refrigeration systems.

Heat regeneration and mass recovery are two ways to improve the cooling performance and the cycle cooling power of an adsorption refrigeration cycle. The definitions of the pressure coefficient of mass recovery and temperature coefficient of heat regeneration are presented in this paper to describe the degree of mass recovery and heat regeneration, as well as to discuss the combined effects of heat regeneration and mass recovery on adsorption refrigeration cycles. Besides, isothermal and adiabatic mass recovery processes are also compared in the paper.