Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units

被引：130

作者：

Banasiak, Krzysztof ^{[1
]}

Hafner, Armin ^{[1
]}

Kriezi, Ekaterini E. ^{[2
]}

Madsen, Kenneth B. ^{[2
]}

Birkelund, Michael ^{[2
]}

Fredslund, Kristian ^{[2
]}

Olsson, Rickard ^{[2
]}

机构：

[1] SINTEF Energy Res, N-7465 Trondheim, Norway

[2] DANFOSS AS, DK-6000 Kolding, Denmark

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2015年 / 57卷

关键词：

Multi-ejector; Expansion work recovery; R744; Discharge pressure control; CO2 REFRIGERATION CYCLE; SUPERMARKET REFRIGERATION; 2-PHASE EJECTOR; HEAT; SYSTEMS; GEOMETRY;

D O I：

10.1016/j.ijrefrig.2015.05.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A multi-ejector expansion pack, intended as a substitute for a standard high-pressure electronic expansion valve (HPV), was designed, manufactured and experimentally investigated. Four different ejector cartridges were sized to enable a discrete opening characteristic with a binary profile for a parallel-compression R744 system. The system is rated for 70 kW at a 35 degrees C gas cooler outlet temperature and a -3 degrees C evaporation temperature. High values of ejector efficiency, exceeding 0.3 over a broad operation range, were recorded for all four of the cartridges tested under vapour compression conditions. The applicability of the multi-ejector pack as a main flashing device was verified experimentally. Similar profiles of the discharge pressure control error were recorded for both alternative options: expansion purely in the HPV vs. HPV-assisted expansion in the multi-ejector pack. (C) 2015 Elsevier Ltd and IIR. All rights reserved.

引用

页码：265 / 276

页数：12

共 21 条

[1]

[Anonymous], P ATMOSPHERE EUR 201

[2] Mathematical modelling of supersonic two-phase R744 flows through converging-diverging nozzles: The effects of phase transition models [J].