ENERGY CONSUMPTION OF DEFROSTING PROCESS IN NO-FROST REFRIGERATORS

Refrigerators have high energy consumption because they consume energy throughout the day, and they are used in all residences and in most offices. Designing more efficient models and, thus, decreasing the energy consumption of refrigerators have become necessary, owing to the global energy scarcity. The purpose of this study was to decrease energy consumption and increase the efficiency of the defrosting process in no-frost refrigerators. The defrosting process plays an important role in the energy consumption of no-frost refrigerators. The amount of energy needed for defrosting and the time it takes are important factors for manufacturers in terms of energy performance. Recently, a theoretical correlation was developed as a function of the frost thickness, heat flux, and frost density for estimating the defrosting time of an evaporator fin surface. The melting time of the frost on the fin was calculated by a mathematical model and compared to results that were obtained experimentally. The results were differed from the actual melting time as 4.7%.

Keywords:

Energy Consumption of Refrigerator Defrosting Process, Energy Saving in Refrigerator,

PDF

___

[1] 1. DIE, (2015). Elektrik Enerjisi Tüketiminin Sektörel Dağılımı, Devlet İstatistik Enstitüsü, Ankara.
[2] Eckert, E., Drake, R., (1987). Analysis of Heat and Mass Transfer, McGraw-Hill Book Company, USA.
[3] Patil, M., S., Seo J-H., Lee M-Y., (2017). Heat transfer characteristics of the heat exchangers for refrigeration, air conditioning and heat pump systems under frosting, defrosting and dry/wet conditions—A review, Applied Thermal Engineering, 113, 1071–1087.
[4] Saidur, R., Masjuki, H.H., Choudhury, I.A., (2002). Role of ambient temperature, door opening, thermostat setting position and their combined effect on refrigerator- freezer energy consumption, Energy Conversion and Management, 43(6), 845- 854.
[5] Mader, G. and Thybo, C., (2012). A new method of defrosting evaporator coils, Applied Thermal Engineering, 39, 78-85.
[6] Ge, T.S., Dai J.S., Wang, R.Z. (2011). Performance study of silica gel coated fin-tube heat exchanger cooling system based on a developed mathematical model, Energy Conversion and Management, 52, 2329–2338.
[7] Lawrance, J.M.V. and Evans J.A., (2008) Refrigerant flow instability as a means to predict the need for defrosting the evaporator in a retail display freezer cabinet, International Journal of Refrigeration, 31(1), 107-112.
[8] Li, Z., Zhao D., Ding G., Ren T., Miao S., Han X, Noda T., (2017) Improving defrosting performance by controlling frost distribution to match defrosting heat distribution in frost-free household refrigerators, International Journal of Refrigeration, 77, 136-148.
[9] Yoon Y., Jeong H., Lee K., (2018) Adaptive defrost methods for improving defrosting efficiency of household refrigerator, Energy Conversion and Management, 57, 511-516.
[10] Harrington, L., Aye, L., Fuller, B., (2018) Energy impacts of defrosting in household refrigerators: Lessons from field and laboratory measurements, International Journal of Refrigeration, 86, 480-494.
[11] Bansal P., Fothergill, D., Fernandes, R., (2010) Thermal analysis of the defrost cycle in a domestic freezer, International Journal of Refrigeration, 33, 589-599
[12] Knabben, F.T., Hermes, C.J.L. , Melo C. (2011) In-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerating appliances, International Journal of Refrigeration, 34 , 2031-204.1.
[13] Özkan D.B., Özil E., (2006) Experimental study on the effect of frost parameters on domestic refrigerator finned tube evaporator coils, Applied Thermal Engineering, 26, 2490-2493.
[14] Zhang L., Fujinawa, T., Saikawa, M., (2016), Theoretical study on a frost-free household refrigerator-freezer, International Journal of Refrigeration, 62, 60-71.

Başlangıç: 2015
Yayıncı: YILDIZ TEKNİK ÜNİVERSİTESİ

Arşiv