A centralized frost detection and estimation scheme for Internet-connected domestic refrigerators

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-10-31 DOI:10.1016/j.ijrefrig.2024.10.032
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Abstract

Frost accumulation on heat exchange units is a significant problem in refrigeration systems, adversely affecting their operating performance and thereby leading to increased power consumption. Therefore, timely detection and accurate quantification of frost are crucial for effective defrosting strategies. This study presents a novel centralized cloud-based IoT scheme for frost detection and thickness estimation. The image processing is performed on the cloud server to process evaporator coil images for frost thickness quantification. Experiments were conducted on a domestic refrigerator to assess the effectiveness of the proposed image-processing approach and determine latency and processing time. The presented scheme effectively quantifies frost thickness on the evaporator in the 1–5 mm range with a 10.8% error margin. The total inference time, which includes image acquisition, pre-processing, transmission latency, and frost thickness estimation, is approximately 5.15 seconds. The results demonstrate that the proposed image processing method performs comparably to conventional sensors and similar image processing techniques. Moreover, the centralized cloud-based IoT architecture presented effectively meets the scalability demands of consumer refrigerators.
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用于联网家用冰箱的集中霜冻检测和估算方案
热交换装置上的积霜是制冷系统中的一个重要问题,会对其运行性能产生不利影响,从而导致耗电量增加。因此,及时检测和准确量化结霜对于有效的除霜策略至关重要。本研究提出了一种新颖的基于云的集中式物联网方案,用于霜冻检测和厚度估算。图像处理是在云服务器上进行的,用于处理蒸发器盘管图像以量化结霜厚度。在家用冰箱上进行了实验,以评估所提出的图像处理方法的有效性,并确定延迟和处理时间。所提出的方案能有效量化蒸发器上 1-5 毫米范围内的霜厚度,误差率为 10.8%。包括图像采集、预处理、传输延迟和霜厚度估算在内的总推理时间约为 5.15 秒。结果表明,所提出的图像处理方法与传统传感器和类似图像处理技术的性能相当。此外,所提出的基于云的集中式物联网架构可有效满足消费类冰箱的可扩展性需求。
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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