翅片管换热器表面霜层生长特性的实验研究

doi:10.11949/j.issn.0438-1157.20181134

摘要/Abstract

摘要：

空气源热泵系统节能减排效果显著，但在低温高湿的冬季制热工况下，室外蒸发器表面会发生结霜现象，霜层会直接影响换热性能，进而影响系统运行的可靠性及能效。对翅片管换热器霜层生长特性进行了实验研究，实验中采用红外热成像仪对霜层表面温度进行测量，并用千分尺热电偶直接测量装置进行校核。分析了环境温度、相对湿度及迎面风速对结霜厚度、结霜量、霜层-湿空气界面条件的影响，并将霜层表面温度与环境温度之差作为结霜的传热驱动力，将湿空气中水蒸气分压力与霜表面温度下饱和水蒸气分压力之差作为结霜的传质驱动力，对结霜机理进行了分析，为换热器的防结霜和除霜提供了依据，为优化空气源热泵系统的设计奠定了基础。

Abstract:

The air source heat pump (ASHP) system has excellent energy saving and emission reduction effects. However, under environmental conditions of low temperature and high humidity in winter, frost will occur on the surface of the evaporator easily, which affects the heat transfer performance and reliability of the system. The experimental study of frost growth characteristics on the surface of the finned-tube heat exchangers was carried out in this paper. The frost surface temperature was measured by the infrared thermal imager, and calibrated by using the direct measurement with micrometer and thermocouple device. The effects of the ambient temperature, relative humidity and face velocity on the frost thickness, frost mass and the frost-wet air interface conditions are analyzed. The difference between the frost surface temperature and the ambient temperature is regarded as the heat transfer driving force of frosting, and the difference between the water vapor partial pressure in wet air and the saturated water vapor partial pressure at the interface, i.e., the interface water vapor pressure difference, is regarded as the mass transfer driving force of frosting. The frosting mechanism of the finned-tube heat exchangers is analyzed, which lay a foundation for the optimum design and anti-frosting and defrosting of ASHP system.

中图分类号:

TU831.6

张鲁梦, 郭宪民, 薛杰. 翅片管换热器表面霜层生长特性的实验研究[J]. 化工学报, 2018, 69(S2): 186-192.

ZHANG Lumeng, GUO Xianmin, XUE Jie. Experimental study of frost growth characteristics on surface of finned-tube heat exchangers[J]. CIESC Journal, 2018, 69(S2): 186-192.

参考文献 30

[1]	BP PLC.BP Statistical Review of World Energy[R].London:United Kingdom, 2017.
[2]	彭水军, 张文城, 孙传旺, 等.中国生产侧和消费侧碳排放量测算及影响因素研究[J].经济研究, 2015, 50(1):168-182.PENG S J, ZHANG W C, SUN C W, et al.China's production-based and consumption-based carbon emissions and their determinants[J].Economic Research Journal, 2015, 50(1):168-182.
[3]	金嘉玮, 叶尉南, 杨一凡, 等.CO2/NH3复叠式制冷系统在美国大型冷库的应用实例[J].冷藏技术, 2007, 6(2):1-9. JIN J W, YE W N, YANG Y F, et al.Application examples of CO2/NH3 cascade refrigeration system in large cold storage in the United States[J].Cold Storage Technology, 2007, 6(2):1-9.
[4]	NEAL O.Seasonal performance of air conditioners:the effect of frost formation on the performance of a parallel plate heat exchanger[R].United States:Purdue Univ., 1982.
[5]	LEE K S, KIM W S, LEE T H, et al.A one dimensional model for frost formation on a cold flat surface[J].Int.J.Heat Mass Transfer, 1997, 40:4359-4365.
[6]	PIUCCO R O, HERMES C J L, MELO C, et al.A study of frost nucleation on flat surfaces[J].Experimental Thermal & Fluid Science, 2008, 32(8):1710-1715.
[7]	GETU H M, BANSAL P K.New frost property correlations for a flat-finned-tube heat exchanger[J].International Journal of Thermal Sciences, 2011, 50(50):544-557.
[8]	YUN R, KIM Y, MIN M K, et al.Modeling of frost growth and frost properties with airflow over a flat plate[J].International Journal of Refrigeration, 2002, 25(3):362-371.
[9]	LIU Z, WANG H, ZHANG X, et al.An experimental study on minimizing frost deposition on a cold surface under natural convection conditions by use of a novel anti-frosting paint.Part I.Anti-frosting performance and comparison with the uncoated metallic surface[J].International Journal of Refrigeration, 2006, 29(2):229-236.
[10]	NASCIMENTO V S D, LOYOLA F R D, HERMES C J L, et al.A study of frost build-up on parallel plate channels[J].Experimental Thermal & Fluid Science, 2015, 60:328-336.
[11]	CHEN Y, LU P, SHEN C, ZHANG Q, et al.Experimental study on frost formation on a cold surface in low atmospheric pressure[J].Appl.Therm.Eng., 2015, 90:86-93.
[12]	WU X M, HU S, CHU F Q, et al.Experimental study of frost formation on cold surfaces with various fin layouts[J].Appl.Therm.Eng., 2016, 95:95-105.
[13]	WU X M, DAI W T, XU W F, et al.Mesoscale investigation of frost formation on a cold surface[J].Experimental Thermal & Fluid Science, 2007, 31(8):1043-1048.
[14]	SILVA D L, HERMES C J L.Experimental study of frost accumulation on fan-supplied tube-fin evaporators[J].Appl.Therm.Eng., 2011, 31:1013-1020.
[15]	SILVA D L, HERMES C J L, MELO C, et al.First-principles modeling of frost accumulation on fan-supplied tube-fin[J].Appl.Therm.Eng., 2011, 31:2616-2621.
[16]	HAYASHI Y, AOKI A.Study of frost properties correlating with frost formation types[J].ASME J.Heat Transfer, 1977, 99:239-245.
[17]	IRAGORRY J, TAO Y X, JIA S, et al.A critical review of properties and models for frost formation analysis[J].J.HVAC & R Res., 2004, 10:393-420.
[18]	HERMES C J L, HERMES F R, LOYOLA V S, et al.A semi-empirical correlation for the frost density[J].Int.J.Refrig., 2014, 46:100-104.
[19]	NEGRELLI S, HERMES C J L.A semi-empirical correlation for the thermal conductivity of frost[J].Int.J.Refrig., 2015, 58:243-252.
[20]	KIM K, LEE K.Frosting and defrosting characteristics of a fin according to surface contact angle[J].Int.J.Heat Mass Transf., 2011, 54:2758-2764.
[21]	WANG D, TAO T, XU G, et al.Experimental study on frosting suppression for a finned-tube evaporator using ultrasonic vibration[J].Exp.Therm.Fluid.Sci., 2012, 36:1-11.
[22]	RAHMAN M, JACOBI A.Drainage of frost melt water from vertical brass surfaces with parallel microgrooves[J].Int.J.Heat Mass Tran., 2012, 55(5/6):1596-1605.
[23]	RAHMAN M, JACOBI A.Condensation, frosting and frost melt-water retention characteristics on microgrooved brass surfaces under natural convection[J].Heat.Transf.Eng., 2015, 41(34):456-477.
[24]	RAHMAN M, JACOBI A.Effects of microgroove geometry on the early stages of frost formation and frost properties[J].Appl.Therm.Eng., 2013, 56(1/2):91-100.
[25]	RAHMAN M, JACOBI A.Study of frost properties and frost melt water drainage on microgrooved brass surfaces in multiple frost/defrost/refrost cycles[J].Appl.Therm.Eng., 2014, 64(1/2):453-461.
[26]	王成生.热泵空调器结霜工况下动态特性的理论与实验研究[D].天津:天津商业大学, 2005.WANG C S.Theoretical and experimental study on dynamic characteristics of heat pump air conditioner under frosting conditions[D].Tianjin:Tianjin University of Commerce, 2005.
[27]	任悦.空调器变工况性能的理论与实验研究[D].天津:天津商业大学, 2006.REN Y.Theoretical and experimental study on the performance of an air-conditioner under variable conditions[D].Tianjin:Tianjin University of Commerce, 2006.
[28]	杨宾.R410A热泵空调器结霜/除霜特性的数值模拟与实验研究[D].天津:天津商业大学, 2007.YANG B.Numerical simulation and experimental study on the frosting/defrosting characteristics of the heat pump using alternative refrigerant R410A[D].Tianjin:Tianjin University of Commerce, 2007.
[29]	李景善, 郭宪民, 陈轶光, 等.空气源热泵蒸发器表面霜层生长特性实验研究[J].制冷学报, 2010, 31(1):18-22.LI J S, GUO X M, CHEN Y G, et al.Experimental study of frost growth characteristics on outdoor heat exchanger of air source heat pump unit[J].Journal of Refrigeration, 2010, 31(1):18-22.
[30]	代宝民, 马一太.CO2/低GWP工质二元混合物微小通道内流动换热机理的研究[D].天津:天津大学, 2015.DAI B M, MA Y T.Research on heat transfer mechanism of CO2/low GWP refrigerant binary mixtures flowing in micro-and mini-channel[D].Tianjin:Tianjin University, 2015.