The liquid refrigerant defrosting (LRD) is a defrosting method which leads the liquid refrigerant in the high-pressure reservoir to the frosting evaporator. The refrigeration process is continuous during the defrosting period, which increases the defrosting frequency. Compared with the traditional defrosting method, no large fin spacing should be left to reduce the defrosting frequency. The system can recover all the defrosting cooling capacity to improve the subcooling, so that the indoor air temperature fluctuations are avoided. In order to explore the effect and the rule of the LRD, the defrosting experiments were carried out in different frosting mass under the condition of the cold storage temperature of −20 °C. The defrosting time, temperature rise value, cooling capacity, and compressor power consumption value were calculated at the different frosting mass. Interpolation and applying the curve fitting equation helps to obtain remaining values. The relative humidity was calculated by the frosting mathematical model. Finally, the relationship between the coefficient of performance (COP) and the defrosting cycle (the sum of the defrosting time and the frosting time) was obtained. The experiments and theoretical research showed that the fluctuating value of cold storage temperature was about 5 °C and the defrosting time was about 30 min during the defrosting process. In the case of the relative humidity of 70%, 80%, 90%, the optimum defrosting cycle of the experiment was 16.4, 10.9, 7.5 h and the frosting mass was 2.66, 2.90, 3.22 kg, and the maximum COP was 1.51, 1.48, 1.45.
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October 2018
Research-Article
Study on the Liquid Refrigerant Defrosting System and the Defrosting Rule
Meng Wang,
Meng Wang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: wangmeng155@126.com
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: wangmeng155@126.com
Search for other works by this author on:
Runqing Zang,
Runqing Zang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: zrqing@tjcu.edu.cn
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: zrqing@tjcu.edu.cn
Search for other works by this author on:
Hai Feng,
Hai Feng
Refrigeration Engineering Research Center of
Ministry of Education of People's
Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of People's
Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Search for other works by this author on:
Chaoqun Yu,
Chaoqun Yu
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Search for other works by this author on:
He Wang,
He Wang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Search for other works by this author on:
Chenxu Zhang
Chenxu Zhang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Search for other works by this author on:
Meng Wang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: wangmeng155@126.com
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: wangmeng155@126.com
Runqing Zang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: zrqing@tjcu.edu.cn
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
e-mail: zrqing@tjcu.edu.cn
Hai Feng
Refrigeration Engineering Research Center of
Ministry of Education of People's
Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of People's
Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Chaoqun Yu
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
He Wang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Chenxu Zhang
Refrigeration Engineering Research Center of
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
Ministry of Education of
People's Republic of China,
Tianjin University of Commerce,
Tianjin 300134, China
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received December 27, 2017; final manuscript received May 10, 2018; published online June 25, 2018. Assoc. Editor: Wei Li.
J. Thermal Sci. Eng. Appl. Oct 2018, 10(5): 051023 (7 pages)
Published Online: June 25, 2018
Article history
Received:
December 27, 2017
Revised:
May 10, 2018
Citation
Wang, M., Zang, R., Feng, H., Yu, C., Wang, H., and Zhang, C. (June 25, 2018). "Study on the Liquid Refrigerant Defrosting System and the Defrosting Rule." ASME. J. Thermal Sci. Eng. Appl. October 2018; 10(5): 051023. https://doi.org/10.1115/1.4040284
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