In this paper, performance analysis of a hybrid photovoltaic-thermal (PV/T) greenhouse air heater and dryer has been carried out. Analytical expressions have been developed for • greenhouse air temperature, instantaneous and overall energy and exergy efficiencies for without load and • instantaneous exergy efficiency with load under forced mode operation. An experimental validation has been car...

In this paper exergy analysis is used to assess the performance of the three most common air conditioning plant schemes: all-air, dual-duct and fan-coil systems. The results are presented in terms of flow diagrams to provide a clear picture of the exergy flow across the systems. The most relevant outcomes are that the air cooling and dehumidification is the process most responsible for the exer...

BOB PT. Bumi Siak Pusako – Pertamina Hulu is Indonesian Operator Company that uses gas power plant for Pekanbaru Coastal Plan (CPP) block. The 4x6 MW energy capacities must follow energy, exergy, economics analysis and environmental impacts due to CO² emission exhaust temperature. From the analysis, thermal efficiency 42.85%, exegetic 33.22% with largest exergy loss of 18.7 kW in combustion cha...

Shell and tube heat exchangers are one of the most used exchanger types in applications it is important to predict transfer capacity pressure loss both design stage. Heat a can be enhanced by using tubes having surfaces instead smooth ones. In this study, usage corrugated shell investigated ε-NTU method, energy/exergy analysis. The impact on hot cold fluid outlet temperatures, efficiencies, ent...

Since the eco-efficiencies of all industrial processes/plants have become more and more important, engineers need to find a way to integrate control loop configuration and measurements of eco-efficiency. A new measure of ecoefficiency for control loop configuration was developed, the exergy efficiency factor. The exergy efficiency factor is based on the thermodynamic concept of exergy which can...

In this study, a cogeneration cycle in time-transient state is investigated and optimized. A quasi-equilibrium assumed because of the small time increments. Air temperature solar power are calculated hourly. The considered terms energy, exergy, economic environmental analyses. Increasing net present value (the difference between cash inflows outflows over period time) reducing exergy destructio...

In this article, the Dimethyl Carbonate (DMC) synthesis process was investigated thermodynamically based on a well-optimized DMC system for developed configuration, according to real industrial plant, presented by Huang et al. Exergy analysis performed using ProSimPlus software as an efficient modeling and simulation environment that is uniquely capable of exergy balance computations. The key o...

The use of new generation refrigerants in heating and cooling systems operating according to vapor compression cycles the preference renewable energy sources is very important reduce negative effects on environment. Here, exergy performance refrigerant R450A R1234ze, which are alternatives R134a, were theoretically examined. Energy analysis system performed under same working conditions (source...

This study performs the simulation and energy, exergy, economic analyses of an organic Rankine cycle (ORC) integrated with a natural gas combined cycle. Working fluids studied in this research are ammonia, isobutane, R-11, R-113, R-141b. The power plant ORC simulated using Aspen HYSYS software. results show that leads to improvement thermo-economic indexes plant. sensitivity analysis also demon...