GreenHP: Next Generation Heat Pump for Retrofitting Buildings – New Evaporator Component for Large Capacity Air-to-Water Heat Pumps

Air to water heat pumps account by more than 70% for the main share of HP-systems of the European HP market. Retrofitting applications in particular show a very high potential for the A/W heat pump technology. Innovative components will pave the way for the next generation heat pumps. In case of the evaporator, low refrigerant charge is introduced by using bionic distributors and evaporator icing is studied on several heat exchanger designs by using advanced experimental and numerical methods.

[1]  Chi-Chuan Wang,et al.  Sensible heat and friction characteristics of plate fin-and-tube heat exchangers having plane fins , 1996 .

[2]  G. Hewitt,et al.  Studies of Two-Phase Flow Patterns by Simultaneous X-Ray and Flash Photography , 1969 .

[3]  Hrvoje Jasak,et al.  A tensorial approach to computational continuum mechanics using object-oriented techniques , 1998 .

[4]  H. Müller-Steinhagen,et al.  A simple friction pressure drop correlation for two-phase flow in pipes , 1986 .

[5]  Naomi Crawford,et al.  Prediction of Pressure Drop for Turbulent Fluid Flow in 90 Degree Bends , 2003 .

[6]  Pradeep Bansal,et al.  An overview of condensation heat transfer on horizontal tube bundles , 1999 .

[7]  P ? ? ? ? ? ? ? % ? ? ? ? , 1991 .

[8]  Akira Yoshizawa,et al.  A Statistically-Derived Subgrid-Scale Kinetic Energy Model for the Large-Eddy Simulation of Turbulent Flows , 1985 .

[9]  Dennis L. O'Neal,et al.  Defrost cycle performance for an air-source heat pump with a scroll and a reciprocating compressor , 1995 .

[10]  H. Wang,et al.  Effect of vapour velocity on condensate retention between fins during condensation on low-finned tubes , 2012 .

[11]  C. Chang,et al.  Heat transfer and friction characteristics of typical wavy fin-and-tube heat exchangers , 1997 .

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

[13]  C. Hermes,et al.  A study of frost growth and densification on flat surfaces , 2009 .

[14]  Davide Del Col,et al.  Condensation inside and outside smooth and enhanced tubes: a review of recent research , 2003 .

[15]  P. J. Marto.  Film condensation heat transfer measurements on horizontal tubes: Problems and progress , 1992 .

[16]  A. Dukler,et al.  A model for predicting flow regime transitions in horizontal and near horizontal gas‐liquid flow , 1976 .

[17]  Ralph L. Webb,et al.  Mass transfer on and within a frost layer , 2004 .

[18]  Ralph L. Webb,et al.  A fundamental understanding of factors affecting frost nucleation , 2003 .

[19]  E. Moallem,et al.  Frosting performance of fin-and-tube evaporators with small copper tubes diameter. , 2012 .

[20]  R. Webb,et al.  New model for frost growth rate , 2004 .

[21]  D. Chisholm,et al.  Pressure gradients due to friction during the flow of evaporating two-phase mixtures in smooth tubes and channels , 1973 .

[22]  László E. Kollar,et al.  Wind-tunnel investigation of icing of an inclined cylinder , 2010 .

[23]  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 .

[24]  Naomi Crawford,et al.  Prediction of pressure drop for turbulent fluid flow in 90° bends , 2003 .

[25]  Chi-Chuan Wang,et al.  Heat transfer and friction correlation for compact louvered fin-and-tube heat exchangers , 1999 .

[26]  P. Moin,et al.  A dynamic subgrid‐scale eddy viscosity model , 1990 .