A simple program to design a multi-stage jet-pump for refrigeration cycles

被引:18
作者
Grazzini, G [1 ]
Mariani, A [1 ]
机构
[1] Univ Florence, Dipartimento Energet S Stecco, I-501139 Florence, Italy
关键词
ejector; multistage; annular; simulation; steam;
D O I
10.1016/S0196-8904(98)00070-3
中图分类号
O414.1 [热力学];
学科分类号
摘要
A PC quickbasic program was developed in the aim to design a jet-pump device for a water refrigeration cycle. At given conditions of generator, evaporator and condenser, with a defined cooling power, the design is automatic, yielding to a configuration which allows the maximum pressure gain the system can achieve. The physical model used is the classical one-dimensional with constant-area mixing. A second stage is used when the single one cannot achieve the necessary compression ratio,due to boundary condition. An annular primary flux is used for the second stage So a compact structure is obtained leading to an efficient utilization of kinetic energy of the secondary stream. The failure of perfect gas model for steam is discussed so a third stage was excluded. The comparison with some experimental literature data shows a good agreement for single stage model. The multistage annular jet-pump appears as a very promising device in the field of refrigeration. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1827 / 1834
页数:8
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