毕业设计外文翻译----冷却系统利用流体吸热交换器(编辑修改稿)

毕业设计外文翻译----冷却系统利用流体吸热交换器(编辑修改稿)内容摘要：

sis indicated a 67% 3 improvement for the alternative refrigerant system When system modifications included a liquidsuction heat exchanger and counterfloW system heat exchangers (evaporator and condenser). Bittle et al. (1995a) conducted an experimental evaluation of a liquidsuction heat exchanger applied in a domestic refrigerator using R152a. The authors pared the system performance With that of a traditional R12based system. Bittle et al. (1995b) also pared the ASHRAE method for predicting capillary tube performance (including the effects of liquidsuction heat exchangers) With experimental data. Predicted capillary tube mass floW of actual measurements. This paper analyzes the liquidsuction heat exchanger to quantify its impact on system capacity and performance (expressed in terms of a system coefficient of performance, COP). The influence of liquidsuction heat exchanger size over a range of operating conditions (evaporating and condensing) is illustrated and quantified using a number of alternative refrigerants. Refrigerants included in the present analysis are R507A, R404A, R600, R290, R134a, R407C, R410A, R12, R22, R32, and R717. This paper extends the results presented in previous studies in that it considers neW refrigerants, it specifically considers the effects of the pressure drops,and it presents general relations for estimating the effect of liquidsuction heat exchangers for any refrigerant. Heat Exchanger Effectiveness The ability of a liquidsuction heat exchanger to transfer energy from the Warm liquid to the cool vapor at steadystate conditions is dependent on the size and configuration of the heat transfer device. The liquidsuction heat exchanger performance, expressed in terms of an effectiveness, is a parameter in the analysis. The effectiveness of the liquidsuction heat exchanger is defined in equation (1): Where the numeric subscripted temperature (T) values correspond to locations depicted in Figure 1. The effectiveness is the ratio of the actual to maximum possible heat transfer rates. It is related to the surface area。