Performance analysis of different high-temperature heat pump systems for low-grade waste heat recovery

Abstract Different heat pump systems were used to recover the heat from waste water with mean temperature of 45 °C and produce hot water with the temperature up to 95 °C. Those systems include single-stage vapor compression heat pump (system 1), two-stage heat pump with external heat exchanger (system 2), two-stage heat pump with refrigerant injection (system 3), two-stage heat pump with refrigerant injection and internal heat exchanger (system 4), two-stage heat pump with flash tank (system 5) and two-stage heat pump with flash tank and intercooler (system 6). Thermodynamic and economic analyses were conducted to compare the performance of each system. Results showed that the COP and exergy efficiency for both system 5 and system 6 are quite close, and much higher than those of other systems. Besides, the payback period of both system 5 and system 6 are also shorter as compared to other systems. Considering both the thermodynamic performance and economic quality of the system, system 5 is finally preferred since less initial investment is required for system 5 as compared to system 6.

[1]  Richard Turton,et al.  Analysis, Synthesis and Design of Chemical Processes , 2002 .

[2]  Conor J. Walsh,et al.  Desalination using low grade heat in the process industry: challenges and perspectives. , 2012 .

[3]  Shengjun Zhang,et al.  Experimental investigation of moderately high temperature water source heat pump with non-azeotropic refrigerant mixtures , 2010 .

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

[5]  Siaw Kiang Chou,et al.  A modular approach to study the performance of a two-stage heat pump system for drying , 2005 .

[6]  Guoyuan Ma,et al.  Exergetic optimization of a key design parameter in heat pump systems with economizer coupled with scroll compressor , 2007 .

[7]  Li Dong-min.  Application Study on Surplus Heat Reclamation Technique by Heat Pump in Oil Field , 2003 .

[8]  Souvik Bhattacharyya,et al.  Studies on a two-stage transcritical carbon dioxide heat pump cycle with flash intercooling , 2007 .

[9]  Wenming Yang,et al.  Advances in heat pump systems: A review , 2010 .

[10]  Antonio Rovira,et al.  Thermoeconomic optimization of combined cycle gas turbine power plants using genetic algorithms , 2003 .

[11]  Reinhard Radermacher,et al.  Scroll Compressor Simulation Model , 2001 .

[12]  Vincent Lemort,et al.  Thermo-economic optimization of waste heat recovery Organic Rankine Cycles , 2011 .

[13]  James E. Braun,et al.  Energy efficiency analysis of air cycle heat pump dryers , 2002 .

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

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

[16]  Wu Chen,et al.  Study on the Application of High Temperature Heat Pump to Recover Waste Heat of Marine Diesel Engine , 2009, 2009 International Conference on Energy and Environment Technology.

[17]  Stanislav Boldyryev,et al.  Integration of a heat pump into the heat supply system of a cheese production plant , 2008 .

[18]  Y. Yeh,et al.  The pinch technology combined with a heat pump applied in a three-effect evaporator and energy-saving performance assessment , 2012, Korean Journal of Chemical Engineering.

[19]  Arif Hepbasli,et al.  A study on modeling and performance assessment of a heat pump system for utilizing low temperature geothermal resources in buildings , 2007 .

[20]  Jan Szargut.  Component efficiencies of a vapour-compression heat pump , 2002 .