A novel polygeneration system integrating photovoltaic/thermal collectors, solar assisted heat pump, adsorption chiller and electrical energy storage: Dynamic and energy-economic analysis

Abstract In this paper a dynamic simulation model and a thermo-economic analysis of a novel polygeneration system are presented. The system includes photovoltaic/thermal collectors coupled with a solar-assisted heat pump, an adsorption chiller and an electrical energy storage. The modelled plant supplies electrical energy, space heating and cooling and domestic hot water. The produced solar thermal energy is used during the winter to supply the heat pump evaporator, providing the required space heating. In summer, solar thermal energy is used to drive an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess, with respect to the space heating and cooling demand, is used to produce domestic hot water. The produced electrical energy is self-consumed by both user and system auxiliary equipment and/or supplied to the grid. The system model includes a detailed electrical energy model for user storage and exchange with the grid along with a detailed building model. This study is a continuation of previous works recently presented by the authors. In particular, the present paper focuses on the real electrical demands of several types of users and on the analysis of the comfort of building users. Differently from the works previously published by the authors, the present work bases the calculations on measured electrical demands of real users (fitness center and offices). The system performance is analyzed with two different electricity supply contracts: net metering and simplified purchase/resale arrangement. Daily, weekly and yearly results are presented. Finally, a sensitivity analysis is performed in order to determine the system performance as a function of the system main design/control parameters and to evaluate the minimum Simple Pay-Back period. The results outlined a share of the electrical energy storage system on the self-consumed electrical energy of about 20%. The economic profitability is better in case of net metering contract compared to the simplified purchase/resale arrangement one. Moreover, a Simple Pay-Back of about 15 years is achieved for the best configuration, decreasing to 5.6 years in case of capital investment incentive of 65%. The best system configuration, in terms of solar field area, for the fitness center user ranges from 250 to 300 m 2 .

[1]  J.R. Abbad,et al.  Assessment of energy distribution losses for increasing penetration of distributed generation , 2006, IEEE Transactions on Power Systems.

[2]  L. W. Florschuetz.  Extension of the Hottel-Whillier model to the analysis of combined photovoltaic/thermal flat plate collectors , 1976 .

[3]  Francesco Calise,et al.  A novel solar-assisted heat pump driven by photovoltaic/thermal collectors: Dynamic simulation and thermoeconomic optimization , 2016 .

[4]  S. P. Chowdhury,et al.  Economic analysis of PV/diesel hybrid power systems in different climatic zones of South Africa , 2012 .

[5]  Aneta Hazi,et al.  Comparative study of indirect photovoltaic thermal solar-assisted heat pump systems for industrial applications , 2014 .

[6]  Tin-Tai Chow,et al.  A Review on Photovoltaic/Thermal Hybrid Solar Technology , 2010, Renewable Energy.

[7]  Saifur Rahman,et al.  An energy management model to study energy and peak power savings from PV and storage in demand responsive buildings , 2016 .

[8]  Mukesh Singh,et al.  Feasibility study of an islanded microgrid in rural area consisting of PV, wind, biomass and battery energy storage system , 2016 .

[9]  Anna Bruce,et al.  A review of the potential benefits and risks of photovoltaic hybrid mini-grid systems , 2014 .

[10]  Jay F. Whitacre,et al.  Evaluating the value of batteries in microgrid electricity systems using an improved Energy Systems Model , 2015 .

[11]  Macedon Moldovan,et al.  Solar Heating & Cooling Energy Mixes to Transform Low Energy Buildings in Nearly Zero Energy Buildings , 2014 .

[12]  Francesco Calise,et al.  Design and dynamic simulation of a novel solar trigeneration system based on hybrid photovoltaic/thermal collectors (PVT) , 2012 .

[13]  Chris Marnay,et al.  Electric storage in California’s commercial buildings , 2013 .

[14]  Francesco Calise,et al.  Thermoeconomic analysis and optimization of high efficiency solar heating and cooling systems for different Italian school buildings and climates , 2010 .

[15]  Tarek Abdel-Salam,et al.  Solar-assisted heat pump – A sustainable system for low-temperature water heating applications , 2014 .

[16]  Aurélie Chabaud,et al.  A new approach to energy resources management in a grid-connected building equipped with energy production and storage systems: A case study in the south of France , 2015 .

[17]  K. A. Antonopoulos,et al.  Energetic and financial evaluation of solar assisted heat pump space heating systems , 2016 .

[18]  Fabian Ochs,et al.  Minimization of the Residual Energy Demand of Multi-storey Passive Houses – Energetic and Economic Analysis of Solar Thermal and PV in Combination with a Heat Pump , 2014 .

[19]  K. F. Fong,et al.  Potential use of photovoltaic-integrated solar heat pump system in Hong Kong. , 2010 .

[20]  Irene P. Koronaki,et al.  Numerical simulation and parametric study of different types of solar cooling systems under Mediterranean climatic conditions , 2017 .

[21]  Yun Seng Lim,et al.  Methodology for assessing viability of energy storage system for buildings , 2016 .

[22]  G. Heath,et al.  The environmental and public health benefits of achieving high penetrations of solar energy in the United States , 2016 .

[23]  Stefano Squartini,et al.  Multi-apartment residential microgrid with electrical and thermal storage devices: Experimental analysis and simulation of energy management strategies , 2015 .