Diphenyl Oxide Bi‐fluid Power Plants

Dow, Hwan-Soo

doi:10.1111/j.1559-3584.1926.tb01996.x

Cited by 5 publications

(1 citation statement)

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“…The thermal stability and material compatibility of these fluids was investigated in the past. In Dow, 22 a Rankine cycle with diphenyl oxide superimposed on a steam cycle is discussed. According to the paper’s author, at a maximum temperature of 400 ℃, with a boiler in normal carbon steel, the organic working fluid did not show degradation effects due to the high operating temperature.…”

Section: Basic Assumptions and Binary Cycle Working Fluidsmentioning

confidence: 99%

Binary liquid metal–organic Rankine cycle for small power distributed high efficiency systems

Bombarda

Invernizzi

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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There is a common interest in the distributed power generation: generally for the combined production of electrical and thermal energy and often, although not necessarily, in association with renewable energies as heat sources for the prime mover. For example, in the field of distributed concentrated solar power generation of small size, the gas engine technology now seems to be prevailing (Stirling engines operating at maximum temperatures of 600-800 C, with peak net efficiencies at 20-30% and power up to several kilowatts are commonly considered). Organic Rankine engines, fed by biomass, in the power range of about 1 MW are actually a standard. From a strictly thermodynamic point of view, the binary cycle technology, accomplished by alkaline metal Rankine cycle as the topping cycle and a Rankine cycle with organic fluid as the bottoming cycle, could be an advantageous alternative. By their very nature, Rankine cycles have good thermodynamic qualities and, potentially, their thermodynamic performance, for the same maximum and minimum temperatures, could be better than that of a gas cycles. This paper discusses the possibility of adopting binary cycles with a power level in the order of tens of kilowatts. Following an overview of the characteristics of alkaline metals and a look at the possible organic fluids that can be employed in Rankine engines at high temperature (400 C), assuming a limit condensation pressure of 0.05 bar, the thermodynamic efficiency of binary cycles was evaluated and the preliminary sizing of turbines was discussed. The results (e.g. a net cycle efficiency of around 0.46, with maximum temperature of 800-850 C) appear encouraging, even though setting up the systems may be far from easy. For instance, there are difficulties due to the extremely high volumetric expansion ratios of bottoming cycles (400-600, an order of magnitude larger than those of the topping cycles with alkaline metals that we considered), which are moreover associated with a very low minimum pressure and elevated number of revolutions of the turbomachinery (50,000-200,000 r/min). Without doubt, the design tends to be easier as the power levels increase and the minimum condensation pressure for the bottoming cycle rises. Although the authors know of no activity in progress on binary cycles at present, the interesting prospects suggest the topic deserves further study and research.

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Section: Basic Assumptions and Binary Cycle Working Fluidsmentioning

confidence: 99%

Binary liquid metal–organic Rankine cycle for small power distributed high efficiency systems

Bombarda

Invernizzi

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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The Binary Cycles

Invernizzi

2013

Closed Power Cycles

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State of Art on ORC Applications for Waste Heat Recovery and Micro-cogeneration for Installations up to 100kWe

Besong

2015

Energy Procedia

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The growing cost for energy production and distribution as well as problems related to environmental pollution have induced an increasing interest in the research of alternative solutions and in particular innovative technologies capable of compromising energy production cost, optimization and guaranteeing environmental sustainability. One of the technologies of increasing interest in recent years is the Organic Rankine Cycle (ORC). These systems are generally suitable for the recovery of low grade heat at low pressure this is a major advantage of the system in terms of safety and management. Furthermore, they enhance simple operation, low maintenance, and the use of a working fluid that is environmentally friendly. This paper presents a comprehensive and current literature overview of microgeneration systems up to 100kWe. A working fluid screening criteria has been discussed taking into account the environmental impact as well as the thermo-physical properties of various potential working fluids. From the analyses it emerges that the fluid most used in installed ORC systems is the R245fa also confirmed by means of a computational code developed for micro-systems of the size range. Components and expander selection has also been examined, the study reveals that the most suitable expander for the applications of these plant size ranges are the scroll for small installations and the vane or screw expanders for larger installations. Finally a detailed list of characteristics of both industrial and experimental prototype application is presented with references to their manufacturers

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Diphenyl Oxide Bi‐fluid Power Plants

Cited by 5 publications

References 0 publications

Binary liquid metal–organic Rankine cycle for small power distributed high efficiency systems

Binary liquid metal–organic Rankine cycle for small power distributed high efficiency systems

The Binary Cycles

State of Art on ORC Applications for Waste Heat Recovery and Micro-cogeneration for Installations up to 100kWe

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