Özgün Güneş Fotovoltaik/Isıl (Pv/T) Destekli Bir Atıksu Isı Pompası Sisteminin Tasarımı, Kurulumu ve Deneysel Araştırılması

Abstract

In this research project, it was aimed at designing and constructing a hybrid Photovoltaic/Thermal (PV/T) solar-assisted wastewater source heat pump (WWSHP) and evaluating its performance through various energetic and exergetic analysis methods. The WWSHP system consisting of three (a HP, a WW and an end-user) cycles was installed at Yasar University, Izmir, Turkey. Within the scope of the project, a total of 18 experiments was conducted and recorded to assess the performance of the system using various analysis methods such as energy, exergy, exergoeconomic, exergoenvironmental, low-exergy (lowex) methods. A three-dimensional design of different WW heat exchangers (WWHEs) was made at various geometries and lengths while their performance, fluid and heat transfer tests were modeled using computational fluid dynamics (CFD) method. A dynamic model of the heat pump system was also developed using system identification methods, and was used within the model predictive controller to estimate the system’s response to control actions. The results indicated that the overall COP and exergy efficiency values of the system were in the range of 1.85-5.89 and 3.39% and 20.71% , respectively. The PV/T unit accounted for the biggest exergy destruction, followed by the compressor and the fan-coil unit. The fan-coil unit caused a decrease in the overall COP and exergy efficiency values due to the higher energy consumption and higher exergy destructions. The exergy efficiency and flexibility factor values from the primary energy transformation to the building envelope were determined to be 5.66% and 14.51% through the lowex analysis, respectively. Based on exergoeconomic and exergoenvironmental analysis results, the exergoeconomic factor values were obtained to be larger than 0.5 for the system components excluding the fan-coil unit and the PV/T system while the exergoenvironmental factor values were obtained to be smaller than 0.5 for the system components excluding the condenser and the pumps.