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![System identification based on experimental approach, adapted from [53].](publication/373078874/figure/fig1/AS:11431281181065116@1691843688207/System-identification-based-on-experimental-approach-adapted-from-53.png)
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In order to lessen reliance on fossil fuels, a rise in interest in the utilization of fluctuating and intermittent heat sources derived from renewable energy (such as solar thermal, ocean thermal, and geothermal) and waste heat has been observed. These heat sources could be used to generate electricity at relatively low and medium temperatures, for...
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This study presents a simulation of an organic Rankine cycle (ORC) for the utilization of combustion gas produced in small landfills in Antioquia, Colombia, with a focus on the municipality of Angostura. This municipality has been chosen as the focus of this study due to its growing population and industrial and tourism development, bringing with t...
Renewable energy is one of environmentally friendly strategies to reduce the environmental pollution caused by energy generation from fossil fuels and reach sustainable development. In this current study, a geothermal driven multi-generation system to provide power, heating, freshwater, hydrogen and oxygen demands is investigated. The main componen...
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... However, it looks like two-phase expansion systems, or PE-ORCs, are being used in recent research [67,68], making it contradict. Based on the literature study, there has been an increased interest in PE-ORC and TFC for utilising heat sources in low temperatures [69,70]. PE-ORC may offer up to 80.00 % more heat utilisation [71], when using low-temperature heat sources taken from PtG and PtM. ...
... Since TEG with PCM might improve its performance, the PCM might also be employed for ORC and even Stirling [194]. A recent article review discussed the possible configuration of ORC with thermal energy storage (TES) and prospective TES materials for low and medium temperatures [69,195], including direct and indirect TES. The fact that TES provides flexibility in terms of storing and accumulating heat sources, integrating waste heat recovery with TES in PtH and PtM systems may also be promising for the direction of future research, which is of the ratio between passive and active volume, and increasing the number of acoustic cores (regenerator) or hybrid might improve the efficiency and reduce the onset temperature [190], making it more competitive [181]. ...
Power-to-Gas technologies are high-capacity systems, which can be used to optimise the use of renewable energy to meet energy demands. Among them, Power-to-Methane (PtM) stands out due to the ease of storage and use of the produced methane. However, its total storing efficiency (Power-to-Methane-to-Power) is likely still low as there are various losses. This paper presents an overview of PtM improvement through the utilisation of low temperature waste heat produced upon the two steps by converting power to gas, namely electrolysis and methanation. An organic Rankine cycle, Stirling engine, and thermoelectric generator were chosen as promising technologies that could be implemented to recover the waste heat and improve the PtM system. Several experimental studies of each technology were reviewed. Moreover, some technological and economic surveys are described and discussed. At the end of the article, the study discussed the direction of further research and development for waste heat recovery in the system to increase the competitiveness of the PtM system and its efficiency.
... In contrast to the standard Clausius-Rankine cycle, ORC technology employs organic working fluid instead of water (R718) in a closed-loop system that, in the simplest configuration, consists of an evaporator, an expander, a condenser, and a pump. Another type of ORC that employs a two-phase expansion system (so-called partially evaporated ORC or PE-ORC) could be considered an alternative solution, which is well-fitting to low-grade heat sources [3][4][5]. The so-called trilateral flash cycle (TFC), which is also being discussed as an alternative to the ORC cycle, can be implemented using the same technical layout of configurations but with different operating conditions of thermodynamic processes (i.e., where not the saturated vapor/superheated working fluid but the saturated liquid is expanded) [6]. ...
This study examines the overall thermodynamic efficiency of several power cycles, including transcritical power
cycle (TPC), trilateral flash cycle, organic Rankine cycle (ORC), partially evaporated ORC, and superheated ORC
under both ideal and specific conditions. The research focuses on specific wet and isentropic working fluids,
providing a performance map of the power system with identical configurations, internal machine efficiency, and
vapor quality. Moreover, this study aims to determine the ideal working fluid to utilize given heat sources by
TPC. The results indicate that the efficiency of TPC may reach a maximum and subsequently decrease under
certain conditions. Moreover, some operating conditions for the thermal power system, such as temperature
range and configurations, may not be recommended due to exceptionally low or negative effective thermodynamic cycle efficiencies. Furthermore, the study demonstrates that increasing the inlet temperature of the
working fluid to an expander does not necessarily lead to higher power cycle efficiency, as observed in the case of
TPC. However, the result also proves the potential of carbon dioxide (R744) as a promising working fluid when
chosen for a TPC with x2,is = 1.00, still achieving positive effective efficiency under specific conditions.
