New Principles for Dynamic Aircraft Exergy Mapping

Berg, Frederick; Balchin, M.J.; Keogh, Patrick

doi:10.2514/1.c032040

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…Due to the complex nature of aircraft systems, many authors have commented on the difficulty in visualising exergy flow through an entire system. Two method have been proposed, the use of exergy flow diagrams from the work of Paulus [76] [77] and Grassman diagrams by De Oliveira [36] and Berg [22]. Fig.…”

Section: Visualising Exergy Usementioning

confidence: 99%

“…The reference state difficulty associated with aerospace exergy analysis has been studied by both Dincer [37] and Berg [22] [23] [24]. At a more fundamental level, Sciubba [97] states in relation to chemical exergy selecting a set of reference substances and determining their average concentration in the earths crust.…”

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

“…In contrast to the conclusions of Dincer, Etele was able to show that the exergy efficiency of a simplistic approach (ground level or Figure 19: Variance of fuel chemical exergy with environment temperature [58] cruise reference) gave a similar result to that of the complex variable reference state. However, the work of Berg [22] [24] on time-variant exergy analysis concluded that for a complete system mapping the vehicle exergy must allow for time variant analysis. Such an analysis allows for temporary storage of exergy.…”

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

“…Berg undertakes a time-variant analysis in a similar method to that of Gandolfi [50] [51], where the phases of flight are broken down, and reference environment parameters are obtained for each of the broken down phases. Unlike Gandolfi, Berg is able to validate his results against a simple UAV model [22] and then through a more complex commercial aircraft mapping [24].…”

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

See 3 more Smart Citations

Adopting exergy analysis for use in aerospace

Hayes

Lone

Whidborne

et al. 2017

Progress in Aerospace Sciences

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Thermodynamic analysis methods, based on an exergy metric, have been developed to improve system efficiency of traditional heat driven systems such as ground based power plants and aircraft propulsion systems. However, in more recent years interest in the topic has broadened to include applying these second law methods to the field of aerodynamics and complete aerospace vehicles. Work to date is based on highly simplified structures, but such a method could be shown to have benefit to the highly conservative and risk averse commercial aerospace sector. This review justifies how thermodynamic exergy analysis has the potential to facilitate a breakthrough in the optimization of aerospace vehicles based on a system of energy systems, through studying the exergy-based multidisciplinary design of future flight vehicles.

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Section: Visualising Exergy Usementioning

confidence: 99%

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

Section: Mapping Exergy Over the Variable Flight Envelopementioning

confidence: 99%

See 2 more Smart Citations

Adopting exergy analysis for use in aerospace

Hayes

Lone

Whidborne

et al. 2017

Progress in Aerospace Sciences

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“…We need a power take-off unit to convert the irregular mechanical motion into a smoothed electrical output. Currently the most common form of PTO is hydraulic unit [10] which pumps fluid, via control manifolds, into high-pressure (HP) accumulators for short-term energy storage [11]. Hydraulic motor receives the smooth supply of high-pressure fluid from the HP accumulators to drive electric generator.…”

Section: Design and Simulation Of The Hydraulic Pto Circuitmentioning

confidence: 99%

Research on the hydraulic power take-off unit of a hybrid wave energy converter

Sun

Luo

et al. 2016

OCEANS 2016 - Shanghai

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As an economical and easy deployment wave energy converter (WEC), oscillating bodies WEC is gained more and more attention, and it has great significance of research, especially on supplying power for buoy observation and underwater sensor network. Hybrid wave energy converter, it also named combined mode wave energy converter, can capture the kinetic energy of multiple degrees of freedom of an oscillating body. This paper presents a design of hybrid wave energy converter equipped with a hydraulic power take-off (PTO) unit, and builds the mathematical model of the hydraulic PTO circuit. According to the result of the numerical simulation of the hydraulic circuit, a steady system pressure and an essentially constant motor speed can be obtained with the help of accumulators. More cylinders than one are applied in the hydraulic circuit, and the relative spatial positions of the cylinders will affect the stability of the system pressure. Additionally, the stability of hydraulic system pressure is influenced also by the size of the accumulator and the number of the cylinders.

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Partitioning of MCHP-TES system run time to incorporate transient system behaviour: a comprehensive exergy-based analysis using simulation

Ummenhofer

Olsen

Roediger

2016

Int. J. Energy Res.

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SUMMARYBy combining heat and power generation, mini-combined and micro-combined heat and power systems (MCHP) provide an efficient, decentralised means of power generation that can complement the composition of the electricity generation mix. Dynamic tools capable of handling transient system behaviour are required to assess MCHP efficiency beyond a mere static analysis based on steady-state design parameters. Using a simulation of a cogeneration system, we combine exergetic definitions for different operational system states to quantify the overall system efficiency continuously over the whole period of operation. The concept of exergy allows direct comparison of different forms of energy. A sensitivity analysis was performed where we quantified the effect on MCHP overall performance under varying engine rotational speed, thermal energy storage size and fluid storage temperature in a range of MCHP simulations. We found that the exergetic quantity of natural gas used by the MCHP decreased slightly at higher engine speeds (À2% to À4%). While the total amount of electricity generated is almost constant across the range of different engine output, more thermal exergy (up to +21%) can be recovered when the engine is operating at elevated speeds. Furthermore, selection of specific optimal thermal storage fluid temperatures can aid in improving system efficiency.

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New Principles for Dynamic Aircraft Exergy Mapping

Cited by 11 publications

References 21 publications

Adopting exergy analysis for use in aerospace

Adopting exergy analysis for use in aerospace

Research on the hydraulic power take-off unit of a hybrid wave energy converter

Partitioning of MCHP-TES system run time to incorporate transient system behaviour: a comprehensive exergy-based analysis using simulation

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