A parametrical study on the energetic and exergetic assessment of a solar-assisted vertical ground-source heat pump system used for heating a greenhouse

Abstract An energetic and exergetic modeling of a solar-assisted vertical ground-source heat pump (GSHP) greenhouse heating system (SAGSHPGHS) for system analysis and performance assessment is presented in this study. Energy (heating coefficient of performance ‘COP’) and exergy efficiencies at various reference and entering water temperatures are also determined. The actual thermal data collected are utilized for the model calculations at different reference temperature values in the range of −0.69 to 25 °C. Furthermore, the performance of a SAGSHPGHS, installed in Solar Energy Institute of Ege University, Izmir, Turkey, is evaluated to show, how energy and exergy efficiencies values change with system. The exergy destructions in the overall SAGSHPGHS are quantified, particularly for a reference temperature of −0.69 °C on 7 January 2004 for comparison purposes. Based upon the measurements made in the heating mode from the 16th of December 2003 till 31st of March 2004, average heating COPs of the GSHP unit and the overall system are obtained to be 2.84 and 2.27, respectively. The best (peak) COP of the GSHP and system were found to be 3.14 and 2.79 on 7 January 2004, respectively. Average exergy efficiency of the system is determined to be 68.11%, while the best exergy efficiency peak values for the GSHP unit and the whole system on a product/fuel basis are obtained to be 76.2% and 75.6%, respectively.

[1]  Siaw Kiang Chou,et al.  On the study of an energy-efficient greenhouse for heating, cooling and dehumidification applications , 2004 .

[2]  Jan Szargut,et al.  Exergy Analysis of Thermal, Chemical, and Metallurgical Processes , 1988 .

[3]  Stephen P. Kavanaugh,et al.  Ground Source Heat Pumps : Design of Geothermal Systems for Commercial and Institutional Buildings , 1997 .

[4]  Ibrahim Dincer,et al.  Thermo-Mechanical Exergy Analysis of Balcova Geothermal District Heating System in Izmir, Turkey , 2004 .

[5]  A. Hepbasli,et al.  Experimental investigation of the performance of a solar‐assisted ground‐source heat pump system for greenhouse heating , 2005 .

[6]  S. C. Kaushik,et al.  Exergetic analysis of a solar thermal power system , 2000 .

[7]  I. Dincer,et al.  Exergy as the confluence of energy, environment and sustainable development , 2001 .

[8]  Reinerus Louwrentius Cornelissen,et al.  Thermodynamics and sustainable development; the use of exergy analysis and the reduction of irreversibility , 1997 .

[9]  A. Hepbasli,et al.  Performance analysis of a solar-assisted ground-source heat pump system for greenhouse heating: an experimental study , 2005 .

[10]  A. Hasan,et al.  First and second law analysis of a new power and refrigeration thermodynamic cycle using a solar heat source , 2002 .

[11]  Onder Ozgener,et al.  Experimental performance analysis of a solar assisted ground-source heat pump greenhouse heating system , 2005 .

[12]  A. Bejan.  Advanced Engineering Thermodynamics , 1988 .

[13]  Ibrahim Dincer,et al.  Effect of varying dead-state properties on energy and exergy analyses of thermal systems , 2004 .

[14]  D. Yogi Goswami,et al.  Principles of Solar Engineering , 1978 .

[15]  M. Iqbal,et al.  Optimum collector slope for residential heating in adverse climates , 1979 .

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

[17]  R. R. Crawford,et al.  An experimental laboratory investigation of second law analysis of a vapor-compression heat pump , 1988 .

[18]  Ibrahim Dincer,et al.  Exergy: Energy, Environment and Sustainable Development , 2007 .

[19]  K. Wark,et al.  Advanced thermodynamics for engineers , 1994 .

[20]  I. Dincer.  The role of exergy in energy policy making , 2002 .

[21]  Ibrahim Dincer,et al.  Energy and exergy analysis of Salihli geothermal district heating system in Manisa, Turkey , 2005 .

[22]  S. Klein.  Calculation of monthly average insolation on tilted surfaces , 1976 .

[23]  I. Dincer,et al.  Energy, environment and sustainable development , 1999 .

[24]  H. Öztürk,et al.  Energetic and exergetic efficiency of latent heat storage system for greenhouse heating , 1999 .

[25]  Gunnar Tamm,et al.  Theoretical and experimental investigation of an ammonia–water power and refrigeration thermodynamic cycle , 2004 .

[26]  Olivério D. D. Soares,et al.  Innovation and technology : strategies and policies , 1997 .

[27]  W. Beckman,et al.  Solar Engineering of Thermal Processes , 1985 .

[28]  Antonio Lecuona,et al.  Compressors driven by thermal solar energy: Entropy generated, exergy destroyed and exergetic efficiency , 2002 .

[29]  M. Santarelli,et al.  Calculation for physical and chemical exergy of flows in systems elaborating mixed‐phase flows and a case study in an IRSOFC plant , 2004 .

[30]  A. Başçeti̇nçeli̇k,et al.  Energy and exergy efficiency of a packed-bed heat storage unit for greenhouse heating , 2003 .

[31]  Viorel Badescu,et al.  First and second law analysis of a solar assisted heat pump based heating system , 2002 .

[32]  Lee Miles.  Heat Pumps: Theory and Service , 1993 .

[33]  Geoffrey P. Hammond,et al.  Exergy analysis of the United Kingdom energy system , 2001 .

[34]  Richard A. Gaggioli,et al.  Available Energy and Exergy , 1998 .

[35]  Onder Ozgener,et al.  Geothermal Heating Applications , 2004 .

[36]  Athanassios A. Argiriou,et al.  Design and operation of a low energy consumption passive solar agricultural greenhouse , 1994 .

[37]  E. Torres-Reyes,et al.  Optimal performance of an irreversible solar-assisted heat pump , 2001 .

[38]  Moustafa M. Elsayed,et al.  Optimum orientation of absorber plates , 1989 .