Experimental investigation of a new CO2 refrigeration system arrangement for supermarket applications

被引：3
作者：
Paez, Ana [1 ,2 ,3 ,4 ]
Ballot-Miguet, Benedicte [4 ]
Michel, Benoit [1 ]
Tobaly, Pascal [2 ,3 ]
Revellin, Remi [1 ]
机构：
[1] Univ Lyon, INSA Lyon, CNRS, CETHIL,UMR5008, F-69621 Villeurbanne, France
[2] LaFSET Lab Froid Syst Energet & Therm, F-75003 Paris, France
[3] Univ Sorbonne Paris Nord, F-93430 Villetaneuse, France
[4] EDF R&D, F-77250 Ecuelles, France
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION | 2024年 / 162卷
关键词：
CO2 Refrigeration system; Internal heat exchanger; Reduced superheat; Energy efficiency and experimentation; INTERNAL HEAT-EXCHANGER; THERMODYNAMIC ANALYSIS; THEORETICAL EVALUATION; PARALLEL COMPRESSION; EXPANSION VALVE; 2-PHASE EJECTOR; MULTI-EJECTOR; CYCLE; PERFORMANCE; PLANT;
D O I：
10.1016/j.ijrefrig.2024.03.010
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A new position of an internal heat exchanger within the thermodynamic cycle is proposed to improve the performance of CO 2 refrigeration systems in warm climates, specifically in supermarket applications. The proposed configuration uses the saturated vapor from the liquid receiver to recover the heat that is rejected by a subcooler positioned after the gas cooler. This system results in a reduced evaporator superheat. This configuration is compared with a reference system. The experimental study is conducted on a CO 2 laboratory cooling system reproducing a commercial plant. The cooling capacity of the system is 30 kW. The water inlet temperature in the gas cooler (hot source) varies from 15 degrees C to 35 degrees C, while the mono -ethylene glycol outlet temperature of the evaporator (cold source) is fixed at -8 degrees C. The setup is validated through an energy balance. Using a subcooler in this new position improves the coefficient of performance by 10.2 % under transcritical conditions and 6.3 % under subcritical conditions when compared with the reference system.
引用
收藏
页码：245 / 256
页数：12
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