Performance optimization of a frost-free air cooled refrigerator with series-parallel refrigeration cycle

doi:10.11949/0438-1157.20201600

Abstract

Abstract:

A frost-free air cooled refrigerator with series-parallel refrigeration cycle is studied, and the refrigerating capacity of the refrigerator and energy saving ability is optimized. Also, the influence of optimal charge quantity and optimal mass fraction of zeotropic refrigerant mixture on system performance are analyzed by experimental methods. The results shows that there exist optimal charge quantity and optimal mass fraction of zeotropic refrigerant mixture cause the power consumption and freezing chamber temperature achieve the minimum, which is 1.51 kW·h/d and -40.7℃, respectively. Besides, the experiments data shows that the optimal voltage of the fan fixed in 7.5V can make the power consumption of the refrigerator reduced 10% to 1.16 kW·h/d.

Key words: optimal design, binary mixture, mechanical properties

摘要：

基于一台采用串并联制冷循环的风冷冰箱，以提高冷冻室冷冻能力和降低系统耗电量为目标，采用非共沸混合工质制冷剂，通过试验手段研究并获得了关键参数对系统性能的影响规律。研究结果表明，分别存在最佳充注量和组分浓度的不同组合，使得冰箱耗电量和冷冻室最低温度达到最低，分别为1.51 kW·h/d和-40.7℃。为了进一步降低冰箱能耗，通过试验发现风机电压存在最优值7.5 V，使得冰箱整机耗电量降低10%，达到1.16 kW·h/d。

关键词: 优化设计, 二元混合物, 力学性能

CLC Number:

TB 657.4

HAO Gangwei, LIU Ye, YAN Gang, YU Jianlin. Performance optimization of a frost-free air cooled refrigerator with series-parallel refrigeration cycle[J]. CIESC Journal, 2021, 72(S1): 178-183.

郝刚卫, 刘晔, 晏刚, 鱼剑琳. 串并联风冷冰箱性能优化[J]. 化工学报, 2021, 72(S1): 178-183.

Figures/Tables 7

Fig.1 Structure diagram of experimental prototype

Table 1 Temperature setting of refrigerator

测试项目	t_r/℃	t_f/℃	t_v/℃
拉低温测试	5	-40	-18
耗电量测试	4	-18	-7

Fig.2 Temperature of compartments

Table 2 Different qualities and components with their corresponding minimum temperature of freezer space

m_c/g	冷冻间最低温度/℃
m_c/g	38%	43%	48%
77	-38.0	-40.6	-40.7
91	-36.3	-38.8	-39.1
105	-30.6	-32.4	-33.8

Table 3 Different components with their corresponding power consumption of the refrigerator

C/g	Z_R290/%	W/(kW·h/d)	R/%
77	38	1.51	90.7
77	43	1.52	74.1
77	48	1.58	72.4

Fig.3 Different qualities with their corresponding power consumption of refrigerator

Table 4 Different voltages of fan with their corresponding parameters

U/V	P/W	R	W/(kW·h/d)	t_evi/℃	t_evo/℃
6.5	0.65	0.43	1.16	-22.8	-20.6
7.5	0.83	0.54	1.16	-21.7	-19.7
8.5	1.19	0.78	1.18	-21.4	-19.3
9.5	1.52	1.00	1.24	-21.4	-19.2
10.5	1.99	1.31	1.26	-21.3	-19.1
11.5	2.65	1.74	1.29	-21.2	-19.0

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