Yıl 2018, Cilt 21, Sayı 4, Sayfalar 214 - 219 2018-12-04

Investigation of Control Process in Liquid Refrigerant Defrosting System

Meng Wang [1] , Runqing Zang [2] , Yanhe Li [3] , Wenqing Li [4]

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The liquid refrigerant defrosting system (LRDS) has the advantages that the refrigeration process is continuous, the temperature fluctuation of the cold storage is small, and the cooling energy of the frost can be recovered effectively. However, the system is too complex to apply and promote in the modern cold storage. In order to solve the problem of operation difficulty, the control experiments were carried out, including the beginning of the defrosting (BD), the end of the defrosting (ED), the draining time (DT) and the time difference between the two air coolers start-up (TDTACS). The results showed that the LRDS started to defrost when the air pressure difference was higher than 0.5mbar. The outlet should be located at the middle part of the lower 1/3 part of the evaporation surface. The measuring pressure tube inserted the fin 20mm, and the nozzle was perpendicular to the evaporation pipe. The experimental ambient temperature was 30, and the frost mass was 3kg. The gas return temperature at the ED was 3.0, 4.0, 5.0, 6.4 and 7.4 respectively when the cold storage temperature was 0, 5, 10, 15 and 20 respectively. The DT was controlled between 140s and 180s, which could prevent the wet compression. In order to get the TDTACS, the manual control could be adopted for the first defrosting. Then the air pressure difference control could be used. The two air coolers could refrigerate and defrost alternately.


Cold storage; defrosting; automatic control; air cooler.
  • [1] P. Byrne, J. Miriel, Y. Lenat, “Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique,” Appl. Energy, 88, 3072-3078, 2011.[2] W. J. Hu, Y. Q. Jiang, M. L. Qu, L. Ni, Y. Yao, S. M. Deng, “An experimental study on the operating performance of a novel reverse-cycle hot gas defrosting method for air source heat pumps,” Appl. Therm. Eng., 31, 363-369, 2011.[3] M. L. Qu, L. Xia, S. M. Deng, Y. Q. Jiang, “A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments,” Appl. Energy, 91, 122-129, 2012.[4] Z. Y. Wang, H. X. Yang, S. Chen, “Study on the operating performance of cross hot-gas bypass defrosting system for air-to-water screw heat pumps,” Appl. Therm. Eng., 59, 398-404, 2013.[5] N. Hoffenbecker, S. A. Klein, D. T. Reindl, “Hot gas defrost model development and validation,” Int. J. Refrig., 28, 605-615, 2005.[6] H. J. Yin, Z. Yang, A. Q. Chen, N. Zhang, “Experimental research on a novel cold storage defrost method based on air bypass circulation and electric heater,” Energy, 37, 623-631, 2012.[7] K. Kwak, C. Bai, “A study on the performance enhancement of heat pump using electric heater under the frosting condition: Heat pump under frosting condition,” Appl. Therm. Eng., 30, 539-543, 2010.[8] S. A. Tassou, D. Datta, D. Marriott, “Frost formation and defrost control parameters for open multideck refrigerated food display cabinets,” Proceedings of the Institution of Mechanical Engineers Part A Journal of Power & Energy, 215, 213-222, 2001.[9] J. Xiao, W. Wang, Y. H. Zhao, F. R. Zhang, “An analysis of the feasibility and characteristics of photoelectric technique applied in defrost-control,” Int. J. Refrig., 32, 1350-1357, 2009.[10] M. H. Kim, K. S. Lee, “Determination method of defrosting start-time based on temperature measurements,” Appl. Energy, 146, 263-269, 2015.[11] Y. Hayashi, A. Aoki, S. Adachi, K. Hori, “Study of frost properties correlating with frost formation types,” J. Heat Transfer, 99, 239, 1977.[12] Y. J. Ge, Y. Y. Sun, W. Wang, J. H. Zhu, L. T. Li, J. D. Liu, “Field test study of a novel defrosting control method for air-source heat pumps by applying tube encircled photoelectric sensors,” Int. J. Refrig., 66, 133-144, 2016.[13] M. J. Song, X. J. Wang, L. Y. Liao, S. M. Deng, “Termination Control Temperature Study for an Air Source Heat Pump Unit During Its Reverse Cycle Defrosting,” Energy Procedia, 105, 335-342, 2017.[14] Y. Q. Jiang, J. K. Dong, M. L. Qu, S. M. Deng, Y. Yao, “A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps,” Int. J. Refrig., 36, 2278-2288, 2013.[15] H. H. Tan, G. H. Xu, F. T. Tao, X. Q. Sun, W. D. Yao, “Experimental investigation on the defrosting performance of a finned-tube evaporator using intermittent ultrasonic vibration,” Appl. Energy, 158, 220-232, 2015.[16] Y. C. Yoon, H. J. Jeong, K. S. Lee, “Adaptive defrost methods for improving defrosting efficiency of household refrigerator,” Energy Conversion & Management, 157, 511-516, 2018.[17] J. Allard, R. Heinzen, “Adaptive defrost,” IEEE Transactions on Industry Applications, 24, 39-42, 1988.[18] Z. Y. Wang, X. M. Wang, Z. M. Dong, “Defrost improvement by heat pump refrigerant charge compensating,” Appl. Energy, 85, 1050-1059, 2008.[19] J. H. Zhu, Y. Y. Sun, W. Wang, Y. J. Ge, L. T. Li, J. D. Liu, “A novel Temperature–Humidity–Time defrosting control method based on a frosting map for air-source heat pumps,” Intern. J. Refrig., 54, 45-54, 2015.
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Konular Mühendislik
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Yazarlar

Yazar: Meng Wang
Ülke: China


Yazar: Runqing Zang
Ülke: China


Yazar: Yanhe Li
Ülke: China


Yazar: Wenqing Li
Ülke: China


Bibtex @olgu sunumu { ijot435774, journal = {International Journal of Thermodynamics}, issn = {1301-9724}, eissn = {2146-1511}, address = {Yaşar DEMİREL}, year = {2018}, volume = {21}, pages = {214 - 219}, doi = {10.5541/ijot.435774}, title = {Investigation of Control Process in Liquid Refrigerant Defrosting System}, key = {cite}, author = {Wang, Meng and Zang, Runqing and Li, Yanhe and Li, Wenqing} }
APA Wang, M , Zang, R , Li, Y , Li, W . (2018). Investigation of Control Process in Liquid Refrigerant Defrosting System. International Journal of Thermodynamics, 21 (4), 214-219. DOI: 10.5541/ijot.435774
MLA Wang, M , Zang, R , Li, Y , Li, W . "Investigation of Control Process in Liquid Refrigerant Defrosting System". International Journal of Thermodynamics 21 (2018): 214-219 <http://dergipark.gov.tr/ijot/issue/40795/435774>
Chicago Wang, M , Zang, R , Li, Y , Li, W . "Investigation of Control Process in Liquid Refrigerant Defrosting System". International Journal of Thermodynamics 21 (2018): 214-219
RIS TY - JOUR T1 - Investigation of Control Process in Liquid Refrigerant Defrosting System AU - Meng Wang , Runqing Zang , Yanhe Li , Wenqing Li Y1 - 2018 PY - 2018 N1 - doi: 10.5541/ijot.435774 DO - 10.5541/ijot.435774 T2 - International Journal of Thermodynamics JF - Journal JO - JOR SP - 214 EP - 219 VL - 21 IS - 4 SN - 1301-9724-2146-1511 M3 - doi: 10.5541/ijot.435774 UR - http://dx.doi.org/10.5541/ijot.435774 Y2 - 2018 ER -
EndNote %0 International Journal of Thermodynamics Investigation of Control Process in Liquid Refrigerant Defrosting System %A Meng Wang , Runqing Zang , Yanhe Li , Wenqing Li %T Investigation of Control Process in Liquid Refrigerant Defrosting System %D 2018 %J International Journal of Thermodynamics %P 1301-9724-2146-1511 %V 21 %N 4 %R doi: 10.5541/ijot.435774 %U 10.5541/ijot.435774
ISNAD Wang, Meng , Zang, Runqing , Li, Yanhe , Li, Wenqing . "Investigation of Control Process in Liquid Refrigerant Defrosting System". International Journal of Thermodynamics 21 / 4 (Aralık 2018): 214-219. http://dx.doi.org/10.5541/ijot.435774