We present a thermo-economic analysis of an Organic Rankine Cycle (ORC) for waste heat recovery. A case study for a heat source temperature of 150 ̋C and a subcritical, saturated cycle is performed. As working fluids R245fa, isobutane, isopentane, and the mixture of isobutane and isopentane are considered. The minimal temperature difference in the evaporator and the condenser, as well as the mi...

Phase change materials employed as thermal energy storage can aid in maximizing the use of stored solar energy. The current research examined impact three kinds phase (PCMs) on dynamic performance a organic Rankine cycle (ORC) system based direct vapor production. A number evacuated flat plate collectors, condenser, an expander, and fluid pump make up this system. thermodynamic model generation...

The potential use of many common hydrofluorocarbons and hydrocarbons as well as new hydrofluoroolefins, i.e. R1234yf and R1234ze(E) working fluids for a combined organic Rankine cycle and vapor compression refrigeration (ORC-VCR) system activated by low-grade thermal energy is evaluated. The basic ORC operates between 80 and 40 °C typical for low-grade thermal energy power plants while the basi...

Micro (0.5–10 kW) organic Rankine cycle (ORC) power systems are nowadays considered for domestic power generation. Selection of a suitable expander is one of the most important problems connected with the domestic ORC system design. Volumetric machines or micro-turbines can be adopted as an expander in domestic ORC systems. Scroll and screw expanders are a common choice and were successfully ap...

The location of heat transfer pinch point in evaporator is the base of determining operating parameters of organic Rankine cycle (ORC). The physical mathematical model seeking the location of pinch point is established, by which, the temperature variations both of heat source and working fluid with UA can be obtained. Taking heat source with inlet temperature of 160 C as example, the matching p...

Integrated energy systems utilizing renewable sources are sustainable and environmentally substitutes for conventional fossil-fired energy systems. A new multigeneration plant with two inputs, such as biomass and solar energy, and four useful outputs, such as cooling, heating, power, and distilled water, is presented and investigated in this paper. The proposed system includes evacuated tub...

Low-grade heat can be successfully recovered from waste energy sources for power production by an organic Rankine cycle (ORC). In this work, reheat ORC has been studied with three different wet fluids. The performance of R1270, R152a and Cyclopropane modelled in operated a source 413.15K. model contains economizer, evaporator, superheater, reheater, two turbine, pump condensers. With variable t...

To achieve energy saving and emission reduction for vehicle diesel engines, the organic Rankine cycle (ORC) was employed to recover waste heat from vehicle diesel engines, R245fa was used as ORC working fluid, and the resulting vehicle diesel engine-ORC combined system was presented. The variation law of engine exhaust energy rate under various operating conditions was obtained, and the running...

Abstract Twin-screw expanders are widely used for small to medium-sized organic Rankine cycle (ORC) power generation. In order improve the performance of twin-screw in ORC, this study aims inlet efficiency and reduce pressure loss by changing geometry shell. The CFD transient simulation is pressure, gas flow conditions other parameters working chamber that not easily obtained through experiment...

Aiming at improving the performance of Organic Rankine Cycle (ORC) system with low-grade steam as heat source, this work studied and optimized main operating parameters ORC system. The effects evaporation temperature, superheat degree, condensation temperature regenerator pinch difference on were obtained. optimization for is based indicators specific net power output, waste pollution, cycle ex...