Comprehensive study of a geothermal multi-generation system composed of absorption refrigeration, vapor compression refrigeration, and a fan coil unit to sustain sport facilities

Over the past years, considerable focus has been placed on advancing sustainable energy solutions for buildings, aimed at reducing carbon emissions, enhancing energy performance, and fostering a higher scope of eco-friendly behavior concerning working and residential environments. Specifically, sport facilities raise a need for thorough attention due to relatively high requisites in terms of volume and diversity. This paper delved into thermodynamic and exergoeconomic investigation for a system that combines cascade absorption refrigeration system with a vapor compression refrigeration system, powered by geothermal renewable reservoir of energy. This innovative system served the purpose of generating four distinct outputs: electricity, cooling, potable water, and heating, which are the main requisites of an independent sport facility. Key system performance parameters, such as net power output, COP, SUCP, energy efficiency, and exergy efficiency, in its BM, are measured at 69.74 kW, 0.35, 55.9$/GJ, 48.1 %, and 21.44 %, respectively. This research explored the impact of various factors, including flow rates and pressure from the geothermal source, condenser temperature, the ratio of fresh air, temperatures at the evaporator-condenser interface of the absorption refrigeration section, and the vapor compression refrigeration system's evaporator temperature. Furthermore, the analysis revealed that the highest exergy destruction occurs during geofluid reinjection, accounting for approximately 53 % of the total exergy destruction. All calculations were conducted using the EES, accounting for the outdoor weather conditions specific to the summer climate in Shanghai.