Experimental investigation on a novel cold storage defrosting device based on electric heater and reverse cycle

Wang, Dong; Jiang, Jingde; Lei, Tao; Kou, Zunli; Yao, Lifang

doi:10.1016/j.applthermaleng.2017.08.122

Cited by 25 publications

(6 citation statements)

References 13 publications

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“…According to the references, the anti-frosting technologies include changing the characteristics (temperature, velocity [20], humidity [21], pressure [22] and purified air [23]) of inlet ambient air, changing the cold surface temperature [24], surface treatment [25], changing the structure of air heat exchanger (fin-tube geometry [26][27][28], fin spacing [29,30], fin type [31,32]), changing the interaction between air or frost layer and cold surface (electric field [33], ultrasonic wave [34], magnetic field [35] and low frequency mechanical oscillation [36]). And the defrosting technologies mainly have reverse cycle [37], hot gas bypass [38], electrical heating [19,39,40], warm-air defrosting [41], compressor shutdown [42], hot water spray [43], phase change heat storage, electric field [44], ultrasonic wave [45], magnetic field [46], air-particle jet [47], control strategy [48] and waste heat recovery [49,50]. In the above various technologies, the conventional reverse cycle Energies 2018, 11,2642 3 of 36 (in various units) and the hot gas bypass (in industry units) defrosting technologies are the most widely used.…”

Section: Introductionmentioning

confidence: 99%

“…[29,30], fin type [31,32]), changing the interaction between air or frost layer and cold surface (electric field [33], ultrasonic wave [34], magnetic field [35] and low frequency mechanical oscillation [36]). And the defrosting technologies mainly have reverse cycle [37], hot gas bypass [38], electrical heating [19,39,40], warm-air defrosting [41], compressor shutdown [42], hot water spray [43], phase change heat storage, electric field [44], ultrasonic wave [45], magnetic field [46], air-particle jet [47], control strategy [48] and waste heat recovery [49,50]. In the above various technologies, the conventional reverse cycle (in various units) and the hot gas bypass (in industry units) defrosting technologies are the most widely used.…”

Section: Introductionmentioning

confidence: 99%

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Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Zhang

Zhang³

et al. 2018

Energies

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Frost layer on the outdoor air heat exchanger surface in an air-source heat pump (ASHP) can decrease the system coefficient of performance (COP). Although the common defrosting and anti-frosting methods can improve the COP, the periodic defrosting not only reduces the system energy efficiency but also deteriorates the indoor environment. To solve these problems, it is necessary to clearly understand the frosting phenomenon and to achieve the system frost-free operation. This paper focused firstly on the analyses of frosting pathways and frosting maps. Followed by summarizing the characteristics of frost-free technologies. And then the performances of two types of frost-free ASHP (FFASHP) systems were reviewed, and the exergy and economic analysis of a FFASHP heating system were carried out. Finally, the existing problems related to the FFASHP technologies were proposed. Results show that the existing frosting maps need to be further improved. The FFASHP systems can not only achieve continuous frost-free operation but reduce operating cost. And the total COP of the FFASHP heating system is approximately 30–64% higher than that of the conventional ASHP system under the same frosting conditions. However, the investment cost of the FFASHP system increases, and its reliability also needs further field test in a wider frosting environment. In the future, combined with a new frosting map, the control strategy for the FFASHP system should be optimized.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Zhang

Zhang³

et al. 2018

Energies

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“…They concluded that in the case of the thermal energy storage method, the defrosting time shortened from 71.4 % to 80.5% and the energy consumption decreased by 65.1 % to 85.2% in comparison to the normal reverse cycle defrosting process. Wang et al [12] experimentally tested two defrosting methods for a refrigeration system utilized in a cold room. The first method was electric heater defrosting and the second was reverse cycle defrost.…”

Section: Reverse Cycle Defrostingmentioning

confidence: 99%

Review regarding defrosting methods for refrigeration and heat pump systems

et al. 2021

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The paper presents a literature review regarding defrosting methods for household refrigeration and heat pumps. The literature review covers the period between 2008 and 2020. A number of 61 papers have been studied. The literature review was conducted by dividing the defrost methods into passive and active. Passive methods involve surface coating and off-cycle. The active defrost methods involve reverse cycle, ultrasonic vibration, hot–gas defrost, electric heating and hot fluid. Surface coating and ultrasonic vibration are recent defrost methods proposed in the literature. Also, recently, phase change materials have been used in household refrigerators to improve their efficiency. This is a topic that needs further investigation and is a subject of interest as it can lead to lower energy consumption during defrost cycles. From the present study, the research direction regarding the use of PCMs in defrost cycles can be highlighted.

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“…[1][2][3] The fast development of living standards worldwide has increased the consumer demand for high-quality, nutritional, safe, and fresh fishery food. If aquatic products are allowed to turn yellow naturally, then they will soon become corrupted and lose their food value.…”

Section: Introductionmentioning

confidence: 99%

“…If aquatic products are allowed to turn yellow naturally, then they will soon become corrupted and lose their food value. [1][2][3] The fast development of living standards worldwide has increased the consumer demand for high-quality, nutritional, safe, and fresh fishery food. At present, aquatic products are an important component of the food industry.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a new ice preservation system for supermarkets

Liu

Lou

et al. 2019

Int J Energy Res

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Summary At present, all types of large–medium‐sized supermarkets with aquatic products adopt ice preservation to ensure freshness. The traditional method of ice preservation needs to make a large amount of thick ice and thus wastes manpower and freshwater. A new ice preservation system with cold storage (IP&CS) is designed, and its performance is tested. The use of a cold storage tank to replace the thick ice laid achieves a repeated cold storage and discharge. This experiment uses NaCl solution as the cold storage phase change material (PCM). The phase change temperature of the cold storage PCM and the optimum temperature of the secondary refrigerant during the cold storage process are determined. Results show that the center temperature of aquatic products, water loss rate, color of aquatic products, power consumption, and electricity cost of the IP&CS system are better than those of the traditional ice preservation system.

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Experimental investigation on a novel cold storage defrosting device based on electric heater and reverse cycle

Cited by 25 publications

References 13 publications

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Review regarding defrosting methods for refrigeration and heat pump systems

Performance evaluation of a new ice preservation system for supermarkets

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