Energy efficiency evaluation of a hybrid energy system for building applications in a Mediterranean climate and its feasibility aspect

摘要

This paper deals with the analysis of a specific HYS (hybrid energy system) from an overall energy efficiency aspect and also from an economical aspect. The hybrid energy system was purposely assembled from standard, market available energy technologies that are presently used in majority of building facilities, particularly in residential ones. Based on the previous aspect, the HYS was assembled using a standard split heat pump system (air-conditioning unit) with an integrated accumulation boiler for hot water preparation and using a small PV (photovoltaic) system. An overall energy efficiency analysis showed the HYS system to be highly energy efficient on average as overall energy efficiency ranged from 50% up to over 200% (the heat pump system acts as a kind of efficiency booster). An LCOE (Levelized cost of produced energy) analysis showed that the HYS produced energy cost ranged from 0.035(sic)/kWh up to 0.15(sic)/kWh, in correspondence with overall working time, the average coefficient performance achieved by the heat pump system and in investment conditions. A detailed energy efficiency and feasibility analysis showed that the herein analyzed HYS can be a viable option for small or medium building applications in mild climates. (C) 2015 Elsevier Ltd. All rights reserved.