Experimental investigation of moderately high temperature water source heat pump with non-azeotropic refrigerant mixtures

Experimental investigations were carried out on non-azeotropic refrigerant mixtures, named M1A (mass fraction of 20%R152a and 80%R245fa), M1B (mass fraction of 37% R152a and 63%R245fa) and M1C (mass fraction of 50%R152a and 50%R245fa), based on a water-to-water heat pump system in the condensing temperature range of 70-90 °C with a cycle temperature lift of 45 °C. Performance of R245fa was tested for comparison. Unfair factors in experimental comparative evaluation research with the same apparatus were identified and corrected. Experimental cycle performance of the mixtures were tested and compared with improved experimental assessment methodology. The results show that all of the mixtures deliver higher discharge temperature, higher heating capacity, higher COP and higher [epsilon]h,c than R245fa. M1B presents the most excellent cycle performance and is recommended as working fluid for moderate/high temperature heat pump.

[1]  James M. Calm,et al.  Comparative efficiencies and implications for greenhouse gas emissions of chiller refrigerants , 2006 .

[2]  Dongsoo Jung,et al.  A ‘drop-in’ refrigerant R431A for replacing HCFC22 in residential air-conditioners and heat pumps , 2009 .

[3]  W. Huai.  MODIFICATIONS IN REPRESENTING THE COMPRESSION PROCESS IN THE THEORETICAL VAPOR COMPRESSION REFRIGERATION CYCLE , 2007 .

[4]  Amyn S. Teja,et al.  A NEW CUBIC EQUATION OF STATE FOR FLUIDS AND FLUID MIXTURES , 1982 .

[5]  Nurdan Yildirim,et al.  District heating system design for a university campus , 2006 .

[6]  E. Granryd.  Hydrocarbons as refrigerants — an overview , 2001 .

[7]  Dongsoo Jung,et al.  Experimental performance of R432A to replace R22 in residential air-conditioners and heat pumps , 2009 .

[8]  Abdeen Mustafa Omer,et al.  Ground-source heat pumps systems and applications , 2008 .

[9]  Dongsoo Jung,et al.  Performance of R433A for replacing HCFC22 used in residential air-conditioners and heat pumps , 2008 .

[10]  Lin Shi,et al.  Research methods and performance analysis for the moderately high temperature refrigerant , 2008 .

[11]  Josua P. Meyer,et al.  Investigation of the potential effect of zeotropic refrigerant mixture on performance of a hot water heat pump , 1998 .

[12]  Lingen Chen,et al.  Solar and ground source heat-pump system , 2004 .

[13]  Lin Shi,et al.  Moderately high temperature water source heat-pumps using a near-azeotropic refrigerant mixture , 2005 .

[14]  Josua P. Meyer,et al.  Potential of the zeotropic mixture R-22/R-142b in high-temperature heat pump water heaters with capacity modulation , 1998 .

[15]  Gadhiraju Venkatarathnam,et al.  Performance comparison of HFC227 and CFC114 in compression heat pumps , 2003 .

[16]  Li Zhao,et al.  Experimental evaluation of a non-azeotropic working fluid for geothermal heat pump system , 2004 .

[17]  Dongsoo Jung,et al.  Performance of alternative refrigerants for residential air-conditioning applications , 2007 .

[18]  Mehmet Yilmaz,et al.  Performance analysis of a vapor compression heat pump using zeotropic refrigerant mixtures , 2003 .

[19]  Kamil Kaygusuz,et al.  Performance of solar-assisted heat-pump systems , 1995 .

[20]  D. Jung,et al.  Performance of heat pumps charged with R170/R290 mixture , 2009 .

[21]  Ruzhu Wang,et al.  High temperature hot water heat pump with non-azeotropic refrigerant mixture HCFC-22/HCFC-141b , 2002 .

[22]  Hongxing Yang,et al.  Potential application of solar thermal systems for hot water production in Hong Kong , 2009 .

[23]  N. Hewitt,et al.  Replacing R22 with a hydrocarbon or hydrofluorocarbon? , 2001 .

[24]  J. Krope,et al.  Economy of exploiting heat from low-temperature geothermal sources using a heat pump , 2008 .