In this study, energy analysis of a double-stage Organic Rankine Cycle (ORC) was performed using the Engineering Equation Solver program (EES). first and second stages, eight different organic working fluids (R134a, R410a, RC318, R407c, R22, R23, R116, R218) were used in pairs for certain temperature limits. Choosing suitable refrigerant or pair is crucial ORC’s high thermal efficiency net work...

A multi-variable optimization program has been developed to investigate the performance of Organic Rankine Cycles (ORCs) for low temperature heat recovery applications using both turbine and twin-screw expanders when account is taken of performance variation due to changes in ambient conditions. The cycle simulation contains thermodynamic models of both types of expander. In the case of the twi...

This paper addresses an effective method for the selection and design of optimal working fluids organic Rankine cycle (ORC) based on quantitative fluid rules, aiming to reduce complexity improve calculation efficiency model. In proposed method, critical properties given heat sources are first explored summarized relationship obtained by existing research simulations. Based concept substitution,...

The growing need to recover power from low grade heat sources, has led to a review of the possibilities for producing systems for cost effective power production at outputs as little as 20-50kWe. It is shown that by utilizing the full potential of screw expanders instead of turbines, it is possible to produce Organic Rankine Cycle (ORC) systems at these outputs, which can be installed for a cos...

Waste heat recovery has been considered as an attractive technique to improve the overall energy utilization efficiency of internal combustion (IC) engines. In this paper, distinct from most past research work, a thermally driven refrigeration system based on combined organic Rankine and vapour compression cycles is proposed recover IC engines’ waste contained in cooling water. Based concept, l...

Undesirable emissions in internal combustion engines are of major concern due to their negative effect on the human health and global warming. Implementing an organic Rankine cycle (ORC) mobile applications can help mitigate by transferring some wasted heat into useful electrical or mechanical energy. Considering stringent regulations automobile industry ensuring safety equipment before impleme...

The current study presents the concept of a stand-alone solar organic Rankine cycle (ORC) water pumping system for rural Nepalese areas. Experimental results for this technology are presented based on a prototype. The economic viability of the system was assessed based on solar radiation data of different Nepalese geographic locations. The mechanical power produced by the solar ORC is coupled w...

Higher shares of renewable energy increase the need for electricity storage. A promising storage technology is Pumped-Thermal Electricity Storage (PTES): PTES systems transform into heat using a pump (HP) and reconvert engine. Since both HPs engines require working fluids, maximum performance requires optimal combination process fluids. Herein this work, thermo-economic potential an Organic Ran...

Organic Rankine cycles (ORC) are quite popular, but the overall efficiencies of these plants rather very low. Numerous studies have been conducted in many scientific centers and research to improve efficiency such cycles. The concerns both modification cycle increase parameters medium at inlet turbine. However, even modified rarely exceeds 20%. plant modifications optimization working parameter...