Review on improvement for air source heat pump units during frosting and defrosting

Abstract Air source heat pump (ASHP) units have found worldwide applications due to their advantages of high energy efficient and environmental friendly. Frost deposition and accumulation on the surface of the outdoor coil in an ASHP unit is inevitable and always play significant negative effects. To accurately predict and control a frosting-defrosting cycle, the interrelated heat, mass, and momentum transport phenomena within frost, melted frost and at the air-frost interface, a moving boundary condition, should be clearly understood. This review paper focuses on the developments in frost retarding and defrosting investigations for ASHP units from 2000 to 2017. 12 frost retarding measures and 5 defrosting methods are firstly introduced, followed by 6 typical system optimization methods during reverse cycle defrosting. Alternative control strategies to start and end a defrosting operation are thereby presented. Basing on previous analysis, the existing gaps in the research works on frost retarding and defrosting are identified, and recommendations are finally offered as per the viewpoint of the present authors. This comprehensive and systematic review around an entire frosting-defrosting cycle might provide an overview of the analytical tools for scholars, researchers, product developers, and policy makers, and shed new light on the designing and performance optimization of ASHP units.

[1]  Mao Ning,et al.  An Experimental Study on Performance During Reverse Cycle Defrosting of an Air Source Heat Pump with a Horizontal Three-circuit Outdoor Coil , 2014 .

[2]  Liang Cai,et al.  Study on restraining frost growth at initial stage by hydrophobic coating and hygroscopic coating , 2011 .

[3]  Shiming Deng,et al.  A study on the performance of the airside heat exchanger under frosting in an air source heat pump water heater/chiller unit , 2004 .

[4]  Lorenzo Cremaschi,et al.  Experimental measurements of the surface coating and water retention effects on frosting performance of microchannel heat exchangers for heat pump systems , 2012 .

[5]  Dongmei Pan,et al.  Experimental and numerical study on air flow and moisture transport in sleeping environments with a task/ambient air conditioning (TAC) system , 2016 .

[6]  Wen-Ruey Chang,et al.  Performance of finned tube heat exchangers operating under frosting conditions , 2003 .

[7]  Ju-Suk Byun,et al.  The application of photo-coupler for frost detecting in an air-source heat pump , 2006 .

[8]  Guangcai Gong,et al.  Experimental investigation on an air source heat pump unit with a three-circuit outdoor coil for its reverse cycle defrosting termination temperature , 2017 .

[9]  Wei Wang,et al.  A novel Temperature–Humidity–Time defrosting control method based on a frosting map for air-source heat pumps , 2015 .

[10]  J.E.R. Coney,et al.  Airflow maldistribution and the performance of a packaged air conditioning unit evaporator , 2000 .

[11]  Dongmei Pan,et al.  Computational fluid dynamics analysis of convective heat transfer coefficients for a sleeping human body , 2017 .

[12]  Yong Chan Kim,et al.  Air-side heat transfer characteristics of flat plate finned-tube heat exchangers with large fin pitches under frosting conditions , 2010 .

[13]  Jianghong Wu,et al.  Transient behavior and dynamic performance of cascade heat pump water heater with thermal storage system , 2012 .

[14]  Takao Nishimura,et al.  “Heat pumps — status and trends” in Asia and the Pacific , 2002 .

[15]  Jiang Yiqiang,et al.  A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump , 2014 .

[16]  Bobji,et al.  Effect of wettability and surface roughness on ice-adhesion strength of hydrophilic, hydrophobic and superhydrophobic surfaces , 2014 .

[17]  Diogo L. da Silva,et al.  Effect of frost morphology on the thermal-hydraulic performance of fan-supplied tube-fin evaporators , 2017 .

[18]  Dong Huang,et al.  Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump , 2009 .

[19]  Mengjie Song.  An experimental and numerical study on improving defrosting performances for an air source heat pump unit having a multi-circuit outdoor coil , 2014 .

[20]  J. Seo,et al.  Heat transfer characteristics of the heat exchangers for refrigeration, air conditioning and heat pump systems under frosting, defrosting and dry/wet conditions—A review , 2017 .

[21]  Deng Shiming,et al.  Improving reverse cycle defrosting performance of air source heat pumps using thermal storage-based refrigerant sub-cooling energy , 2012 .

[22]  Shiming Deng,et al.  An experimental study on defrosting performance for an air source heat pump unit with a horizontally installed multi-circuit outdoor coil , 2016 .

[23]  Zhao Li,et al.  Improving defrosting performance of cascade air source heat pump using thermal energy storage based reverse cycle defrosting method , 2017 .

[24]  Chaobin Dang,et al.  Review of restraint frost method on cold surface , 2017 .

[25]  Neil Hewitt,et al.  Defrost cycle performance for a circular shape evaporator air source heat pump , 2008 .

[26]  Xiaosong Zhang,et al.  Control strategy and experimental study on a novel defrosting method for air-source heat pump , 2010 .

[27]  Xiaozhou Wu,et al.  Dynamic Character Investigation and Optimization of a Novel Air-Source Heat Pump System , 2017 .

[28]  Ewart Neal.  Heat pumps—Applications for heating conservation and heat recovery , 1983 .

[29]  A. Sommers,et al.  Densification of frost on hydrophilic and hydrophobic substrates – Examining the effect of surface wettability , 2016 .

[30]  Woo-Seung Kim,et al.  Effect of surface treatments on the frosting/defrosting behavior of a fin-tube heat exchanger , 2002 .

[31]  Shiming Deng,et al.  Experimental investigation on reverse cycle defrosting performance improvement for an ASHP unit by evenly adjusting the refrigerant distribution in its outdoor coil , 2017 .

[32]  Xiaosong Zhang,et al.  Experimental study of the effects of fin surface characteristics on defrosting behavior , 2015 .

[33]  D. Castro,et al.  Microscopic Characterization of Frost Surface During Liquid-Ice Phase Change Period , 2002 .

[34]  Predrag Stojan Hrnjak,et al.  Air-side performance evaluation of three types of heat exchangers in dry, wet and periodic frosting conditions , 2006 .

[35]  Judith Evans,et al.  Refrigerant flow instability as a means to predict the need for defrosting the evaporator in a retail display freezer cabinet , 2008 .

[36]  Adam Hawkes,et al.  A review of domestic heat pumps , 2012 .

[37]  Shengchun Liu,et al.  The optimal charge of carbon dioxide in water–water heat pump systems with and without an internal heat exchanger , 2017 .

[38]  Wenjin Wang,et al.  Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions , 2013 .

[39]  Shiming Deng,et al.  Improved indoor thermal comfort during defrost with a novel reverse-cycle defrosting method for air source heat pumps , 2010 .

[40]  Jean Lebrun,et al.  Scroll compressors using gas and liquid injection: experimental analysis and modelling , 2002 .

[41]  Guangcai Gong,et al.  Performance evaluation of a novel method of frost prevention and retardation for air source heat pumps using the orthogonal experiment design method , 2016 .

[42]  Shiming Deng,et al.  Experimental investigations on destroying surface tension of melted frost for defrosting performance improvement of a multi-circuit outdoor coil , 2016 .

[43]  Simon Song,et al.  Fin spacing optimization of a fin-tube heat exchanger under frosting conditions , 2006 .

[44]  Guoyuan Ma,et al.  Experimental study of a heat pump system with flash-tank coupled with scroll compressor , 2008 .

[45]  Katsuyoshi Fukiba,et al.  Method for defrosting heat exchangers using an air-particle jet , 2015 .

[46]  Carey J. Simonson,et al.  A review of frosting in air-to-air energy exchangers , 2014 .

[47]  Reinhard Radermacher,et al.  Two-stage heat pump system with vapor-injected scroll compressor using R410A as a refrigerant , 2009 .

[48]  Yi Jiang,et al.  Experiment investigation of reverse cycle defrosting methods on air source heat pump with TXV as the throttle regulator , 2004 .

[49]  Anthony M. Jacobi,et al.  Air-side heat transfer enhancement of a refrigerator evaporator using vortex generation , 2005 .

[50]  Zuiliang Ma,et al.  Field test investigation of a double-stage coupled heat pumps heating system for cold regions , 2005 .

[51]  Zhang Li,et al.  Experimental study on heat and mass transfer characteristics for a desiccant-coated fin-tube heat exchanger , 2015 .

[52]  Kwan-Soo Lee,et al.  Frosting and defrosting characteristics of surface-treated louvered-fin heat exchangers: Effects of fin pitch and experimental conditions , 2013 .

[53]  Q. Ma,et al.  Frost formation and frost meltwater drainage characteristics on aluminum surfaces with grooved structures , 2017 .

[54]  Wang Zhiyi,et al.  Defrost improvement by heat pump refrigerant charge compensating , 2008 .

[55]  Zhongliang Liu,et al.  Experimental study on frost release on fin-and-tube heat exchangers by use of a novel anti-frosting paint , 2009 .

[56]  Chi-Chuan Wang,et al.  Review of defrosting methods , 2017 .

[57]  Zhenqian Chen,et al.  Effect of ultrasound on frost formation on a cold flat surface in atmospheric air flow , 2010 .

[58]  Min-Hwan Kim,et al.  Determination method of defrosting start-time based on temperature measurements , 2015 .

[59]  Jing Xiao,et al.  Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena , 2011 .

[60]  Evelyn N Wang,et al.  Jumping-droplet-enhanced condensation on scalable superhydrophobic nanostructured surfaces. , 2012, Nano letters.

[61]  Sung Tack Ro,et al.  An experimental study of frost formation on a horizontal cylinder under cross flow , 2001 .

[62]  Shiming Deng,et al.  An experimental study on defrosting performance for an air source heat pump unit at different frosting evenness values with melted frost local drainage , 2016 .

[63]  S. W. Wang,et al.  A new method for preventing HP from frosting , 2005 .

[64]  Kyung-Min Kwak,et al.  A study on the performance enhancement of heat pump using electric heater under the frosting condition: Heat pump under frosting condition , 2010 .

[65]  Yuting Luo,et al.  Condensate microdrop self-propelling aluminum surfaces based on controllable fabrication of alumina rod-capped nanopores. , 2015, ACS applied materials & interfaces.

[66]  Tang Liming,et al.  Analysis on performance of a novel frost-free air-source heat pump system , 2011 .

[67]  M. Newborough,et al.  Minimising frost growth on cold surfaces exposed to humid air by means of crosslinked hydrophilic polymeric coatings , 2000 .

[68]  Byungsoon Kim,et al.  Defrosting method adopting dual hot gas bypass for an air-to-air heat pump , 2011 .

[69]  J.E.R. Coney,et al.  A comparison of the predicted and experimental heat transfer performance of a finned tube evaporator , 2000 .

[70]  Dong Huang,et al.  Dynamic characteristics of an air-to-water heat pump under frosting/defrosting conditions , 2007 .

[71]  Shiming Deng,et al.  A modeling study on alleviating uneven defrosting for a vertical three-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting , 2016 .

[72]  Ralph L. Webb,et al.  Investigation of the possibility of frost release from a cold surface , 2001 .

[73]  Li Zhang,et al.  A new method for preventing air-source heat pump water heaters from frosting , 2012 .

[74]  D. Özkan,et al.  Experimental Investigation of the Defrosting Process on Domestic Refrigerator Finned Tube Evaporators , 2012 .

[75]  Wei Wang,et al.  Characteristics of an air source heat pump with novel photoelectric sensors during periodic frost–defrost cycles , 2013 .

[76]  M. Mohanraj,et al.  Applications of artificial neural networks for refrigeration, air-conditioning and heat pump systems—A review , 2012, Renewable and Sustainable Energy Reviews.

[77]  Hailong Li,et al.  Impacts on the solidification of water on plate surface for cold energy storage using ice slurry , 2017, Applied Energy.

[78]  Zhang Lin,et al.  Experimental analysis on a novel frost-free air-source heat pump water heater system , 2014 .

[79]  Liang Xia,et al.  A semi-empirical modeling study on the defrosting performance for an air source heat pump unit with local drainage of melted frost from its three-circuit outdoor coil , 2014 .

[80]  Guanghua Xu,et al.  Experimental study on frosting suppression for a finned-tube evaporator using ultrasonic vibration , 2011 .

[81]  Wei He,et al.  Vapor compression multifunctional heat pumps in China: A review of configurations and operational modes , 2012 .

[82]  Wei-Mon Yan,et al.  Thermofluid characteristics of frosted finned-tube heat exchangers , 2005 .

[83]  Ling Yan,et al.  Experimental study on concentration change of spray solution used for a novel non-frosting air source heat pump system , 2014 .

[84]  Minglu Qu,et al.  A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps , 2013 .

[85]  D. Shiming,et al.  Computational fluid dynamics (CFD) modelling of air flow field, mean age of air and CO2 distributions inside a bedroom with different heights of conditioned air supply outlet , 2016 .

[86]  Jaehyeok Heo,et al.  Effects of flash tank vapor injection on the heating performance of an inverter-driven heat pump for cold regions , 2010 .

[87]  Xiaosong Zhang,et al.  Effects of surface characteristic on frosting and defrosting behaviors of fin-tube heat exchangers , 2015 .

[88]  Chaobin Dang,et al.  Performance analysis of a no-frost hybrid air conditioning system with integrated liquid desiccant dehumidification , 2010 .

[89]  Fernando Testoni Knabben,et al.  An experimental study on defrost heaters applied to frost-free household refrigerators , 2013 .

[90]  Minglu Qu,et al.  A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments , 2012 .

[91]  Zhang Lin,et al.  Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification , 2015 .

[92]  Young-Saeng Kim,et al.  EXPERIMENTAL STUDY ON HIGH PERFORMANCE DEFROSTING HEATER FOR HOUSEHOLD REFRIGERATOR , 2006 .

[93]  Y. Tao,et al.  Frost Temperature Relations for Defrosting Sensing System , 2005 .

[94]  Zhao Li,et al.  An experimental study on the uneven refrigerant distribution over a vertically installed multi-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting , 2015 .

[95]  Fu-Yun Zhao,et al.  Dynamic simulation of air-source heat pump during hot-gas defrost , 2003 .

[96]  Dong Rip Kim,et al.  Experimental investigation of frost retardation for superhydrophobic surface using a luminance meter , 2015 .

[97]  Yu Tian,et al.  Defrosting performances of a multi-split air source heat pump with phase change thermal storage , 2015 .

[98]  Mengjie Song,et al.  Numerical study on the operating performances of a novel frost-free air-source heat pump unit using three different types of refrigerant , 2017 .

[99]  Shiming Deng,et al.  An experimental study on even frosting performance of an air source heat pump unit with a multi-circuit outdoor coil , 2016 .

[100]  Dong Huang,et al.  Effect of fin types of outdoor fan-supplied finned-tube heat exchanger on periodic frosting and defrosting performance of a residential air-source heat pump , 2014 .

[101]  Honghyun Cho,et al.  Performance of a showcase refrigeration system with multi-evaporator during on–off cycling and hot-gas bypass defrost , 2005 .

[102]  Shiming Deng,et al.  Review on building energy performance improvement using phase change materials , 2018 .

[103]  Pradeep Bansal,et al.  Thermal analysis of the defrost cycle in a domestic freezer. , 2010 .

[104]  E. Groll,et al.  Two-stage air-source heat pump for residential heating and cooling applications in northern U.S. climates , 2008 .

[105]  Lufeng Che,et al.  Activating the Microscale Edge Effect in a Hierarchical Surface for Frosting Suppression and Defrosting Promotion , 2013, Scientific Reports.

[106]  Guanghua Xu,et al.  Experimental investigation on the defrosting performance of a finned-tube evaporator using intermittent ultrasonic vibration , 2015 .

[107]  Dong Rip Kim,et al.  Frosting behaviors and thermal performance of louvered fins with unequal louver pitch , 2016 .

[108]  Xingqun Zhang,et al.  Effects of fan-starting methods on the reverse-cycle defrost performance of an air-to-water heat pump , 2004 .

[109]  Shiming Deng,et al.  Energy transfer procession in an air source heat pump unit during defrosting , 2017 .

[110]  S. A. Sherif,et al.  Electric defrosting analysis of a finned-tube evaporator coil using the enthalpy method , 2002 .

[111]  Wenjin Wang,et al.  Investigation of defrosting water retention on the surface of evaporator impacting the performance of air source heat pump during periodic frosting–defrosting cycles , 2014 .

[112]  Shiming Deng,et al.  An experimental study on defrosting heat supplies and energy consumptions during a reverse cycle defrost operation for an air source heat pump , 2012 .

[113]  Zhongliang Liu,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 , 2006 .

[114]  Mengjie Song,et al.  An experimental study on defrosting performance of an air source heat pump unit with a multi-circuit outdoor coil at different frosting evenness values , 2016 .

[115]  Zhang Na,et al.  Experimental research on a novel cold storage defrost method based on air bypass circulation and electric heater , 2012 .

[116]  Xuetong Zhao,et al.  Anti-frosting performance of superhydrophobic surface with ZnO nanorods , 2017 .

[117]  Wei Wang,et al.  Field test study of a novel defrosting control method for air-source heat pumps by applying tube encircled photoelectric sensors , 2016 .

[118]  James E. Braun,et al.  Evaluation of a hybrid method for refrigerant flow balancing in multi-circuit evaporators , 2009 .

[119]  Zhihua Wang,et al.  Field test and numerical investigation on the heat transfer characteristics and optimal design of the heat exchangers of a deep borehole ground source heat pump system , 2017 .

[120]  Yuebin Yu,et al.  Performance and thermal charging/discharging features of a phase change material assisted heat pump system in heating mode , 2013 .

[121]  S. Shiratori,et al.  A superrepellent coating with dynamic fluorine chains for frosting suppression: effects of polarity, coalescence and ice nucleation free energy barrier , 2016 .

[122]  Yanjun Ding,et al.  Experimental study of an improved air source heat pump , 2004 .

[123]  Huee-Youl Ye,et al.  Performance prediction of a fin-and-tube heat exchanger considering air-flow reduction due to the frost accumulation , 2013 .

[124]  Masoud Farzaneh,et al.  Ice adhesion on super-hydrophobic surfaces , 2009 .

[125]  Lorenzo Cremaschi,et al.  Experimental investigation of adverse effect of frost formation on microchannel evaporators, part 1: Effect of fin geometry and environmental effects , 2013 .

[126]  J. Boreyko,et al.  Self-propelled dropwise condensate on superhydrophobic surfaces. , 2009, Physical review letters.

[127]  Ni Long,et al.  An experimental study on the operating performance of a novel reverse-cycle hot gas defrosting method for air source heat pumps , 2011 .

[128]  Jesper Kragh,et al.  Mechanical ventilation with heat recovery in cold climates , 2005 .

[129]  Xiaosong Zhang,et al.  Performance analysis of a novel frost-free air-source heat pump with integrated membrane-based liquid desiccant dehumidification and humidification , 2017 .

[130]  Wei Wang,et al.  An analysis of the feasibility and characteristics of photoelectric technique applied in defrost-control , 2009 .

[131]  Dongmei Pan,et al.  An experimental study on the effects of downwards flowing of melted frost over a vertical multi-circuit outdoor coil in an air source heat pump on defrosting performance during reverse cycle defrosting , 2014 .

[132]  Wei Wang,et al.  An experimental study of the correlation for predicting the frost height in applying the photoelectric technology , 2010 .

[133]  Minglu Qu,et al.  An experimental investigation on reverse-cycle defrosting performance for an air source heat pump using an electronic expansion valve , 2012 .

[134]  Shiming Deng,et al.  Application of TOPSIS method in evaluating the effects of supply vane angle of a task/ambient air conditioning system on energy utilization and thermal comfort , 2016 .

[135]  Ning Li,et al.  An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting , 2015 .

[136]  Diogo L. da Silva,et al.  Experimental Study of Frost Accumulation on Fan-Supplied Tube-Fin Evaporators , 2011 .

[137]  James E. Braun,et al.  A hybrid method for refrigerant flow balancing in multi-circuit evaporators: Upstream versus downstream flow control , 2009 .

[138]  Deng Shiming,et al.  Termination Control Temperature Study for an Air Source Heat Pump Unit during Its Reverse Cycle Defrosting , 2017 .

[139]  D. O’Neal,et al.  Frost/defrost performance of a three-row fin staged heat pump evaporator. , 2002 .

[140]  René Rieberer,et al.  Parametric analysis of the defrosting process of a reversible heat pump system for electric vehicles , 2013 .

[141]  Minglu Qu,et al.  Improving the frosting and defrosting performance of air source heat pump units: review and outlook , 2017 .

[142]  Di Liu,et al.  Frosting of heat pump with heat recovery facility , 2007 .

[143]  Cheng Zeng,et al.  A review on the air-to-air heat and mass exchanger technologies for building applications , 2017 .

[144]  Yiqiang Jiang,et al.  Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air source heat pump , 2011 .