Reversible heat pump model for seasonal performance optimization

Building is one of the economical sectors where solutions are available to significantly reduce energy consumption and greenhouse gases emissions. Electric heat pumps are one of the solutions favored in Europe. Europe recently adopted a conventional primary energy to electricity ratio which enables to compare electric heat pumps and fossil fuel boilers. This leads to an increased consideration for the evaluation of the seasonal performances of heat pumps. Nowadays, the design and sizing of heat pumps are still based on full load performance in order to fulfill thermal comfort under extreme conditions. However, the HVAC industry is switching to designs based on improved seasonal performance. The objective of this work is to model an air to water reversible heat pump that can re-design its components for seasonal performance improvement. In this context, we will present a system model including detailed sub-models of each component of the system: heat exchangers, compressor, and expansion valve. The model converges with the system thermodynamic equilibrium after simulating each component separately. Results obtained are validated through experimental data per component and for the whole cycle. Modeling requirements for the purpose of simulating seasonal performance improvements are discussed.

[1]  Francis W.H. Yik,et al.  Modeling the performance characteristics of water-cooled air-conditioners , 2008 .

[2]  A. Yokozeki,et al.  Heat Transfer of Refrigerant Mixtures , 1992 .

[3]  M Ahadzi,et al.  The performance of air-source heat pumps in current and future offices , 2008 .

[4]  James E. Braun,et al.  The Impact of Modeling Complexity and Two-Phase Flow Parameters on the Accuracy of System Modeling for Unitary Air Conditioners , 2004 .

[5]  A. Yokozeki,et al.  Heat Transfer Coefficients and Transport Properties for Alternative Refrigerants , 1994 .

[6]  M. Shah.  A general correlation for heat transfer during film condensation inside pipes , 1979 .

[7]  Björn Palm,et al.  Plate Heat Exchangers: Calculation Methods for Singleand Two-Phase Flow , 2006 .

[8]  K. S. Lee,et al.  Experiments on the characteristics of evaporation of R410A in brazed plate heat exchangers with different geometric configurations , 2003 .

[9]  Jérôme Adnot,et al.  A method to reduce European chiller hourly load curves to a few points. , 2005 .

[10]  Jianlin Yu,et al.  Performance of a new refrigeration cycle using refrigerant mixture R32/R134a for residential air-conditioner applications , 2008 .

[11]  Jocelyn Bonjour,et al.  The effect of oil in refrigeration: Current research issues and critical review of thermodynamic aspects , 2008 .

[12]  Z. Ayub.  Plate Heat Exchanger Literature Survey and New Heat Transfer and Pressure Drop Correlations for Refrigerant Evaporators , 2003 .

[13]  Liang Yang,et al.  Analysis on energy saving potential of integrated supermarket HVAC and refrigeration systems using multiple subcoolers , 2010 .

[14]  Luigi Schibuola,et al.  SIMPLIFIED MODELS TO SIMULATE PART LOAD PERFORMANCES OF AIR CONDITIONING EQUIPMENTS , 2003 .

[15]  John R. Thome,et al.  Condensation in Plain Horizontal Tubes: Recent Advances in Modeling of Heat Transfer to Pure Fluids and Mixtures , 2005 .

[16]  Electo Eduardo Silva Lora,et al.  Influence of ambient temperature on combined-cycle power-plant performance , 2005 .

[17]  John R. Thome,et al.  Heat Transfer Model for Evaporation in Microchannels, Part I: Presentation of the Model , 2004 .

[18]  Shanwei Ma,et al.  Experimental analysis of R22 and R407c flow through electronic expansion valve , 2006 .

[19]  Nae-Hyun Kim,et al.  HEAT TRANSFER AND FRICTION CORRELATIONS FOR PLAIN FIN-AND-TUBE HEAT EXCHANGERS , 1998 .