Thermodynamic Investigation of a Trigeneration ORC Based System Driven by Condensing Boiler Hot Water Heat Source Using Different Working Fluids

This study conducts thermodynamic analysis on three trigeneration cycles including Organic Rankine Cycle (ORC), Liquefied Natural Gas (LNG) cold energy, and absorption refrigeration cycle in order to select appropriate working fluids. Different types of ORC cycles including simple ORC, regenerative, and ORC with Internal Heat Exchange (IHE) were investigated. For those types, the operation of six working fluids with different thermodynamic behaviors (R۱۴۱b, R۱۲۴, R۲۳۶fa, R۲۴۵fa, R۶۰۰, and R۱۲۳) was evaluated. In power plants, a low-grade heat source was provided by condensing boiler hot water energy while the thermal sink was prepared by cold energy of LNG. The effect of boiler temperature variation on energy and exergy efficiencies was investigated. According to the derived results, regenerative ORC-based systems possessed maximum energy and exergy efficiencies, while simple ORC and ORC with internal heat exchanger exhibited approximately the same quantities. Also, among these analyzed working fluids, R۱۴۱b had the maximum energetic and exergetic efficiencies, while R۱۲۴ and R۲۳۶fa had minimum performance.

کلیدواژه ها:

Organic Rankine Cycles (ORCs) ، LNG cold energy ، condensing boiler ، Working fluid ، Thermodynamics analysis