Publications related to Compressed-air vehicle

Compressed natural gas (cng) power system with co2 emissions capture and storage

CNG power system (1) comprising a storage tank (6) connected fluidically to a fuel conversion system (2) via an energy transfer system (4), the fuel conversion system (2) comprising a power unit using CNG as fuel and generating gas emissions comprising C02 ...

2022

A High Efficiency Pneumatic Drive System Using Vane-Type Semi-Rotary Actuators

Alfred Rufer

A compressed air driven generator is proposed, where the pneumatic energy is converted into mechanical energy using two vane-type rotational actuators. The use of a second actuator with a higher displacement in order to produce a thermodynamic expansion al ...

UNIV NIS2021

The Error-Feedback Framework: Better Rates for SGD with Delayed Gradients and Compressed Updates

Sai Praneeth Reddy Karimireddy, Sebastian Urban Stich

We analyze (stochastic) gradient descent (SGD) with delayed updates on smooth quasi-convex and non-convex functions and derive concise, non-asymptotic, convergence rates. We show that the rate of convergence in all cases consists of two terms: (i) a stocha ...

Microtome Publishing2020

Getting More Out of Existing Structures: Steel Bridge Strengthening via UHPFRC

Eugen Brühwiler

Ultra-high-performance fiber-reinforced cement-based composite (UHPFRC) has been increasingly adopted for rehabilitation projects over the past two decades, proving itself as a reliable, cost-efficient and sustainable alternative against conventional metho ...

2019

In-situ strength of individual silicon particles within an aluminium casting alloy

Andreas Mortensen, Goran Zagar, Martin Guillermo Mueller

Measurements of local strength are performed in-situ on individual silicon particles that constitute the second phase of aluminium alloy A356. Particles are shaped using Focused Ion Beam (FIB) milling such that, upon the application of a compressive force ...

2018

Multi-objective optimization and exergoeconomic analysis of a combined cooling, heating and power based compressed air energy storage system

François Maréchal, Ligang Wang, Erren Yao

Compressed air energy storage technologies can improve the supply capacity and stability of the electric- ity grid, particularly when fluctuating renewable energies are massively connected. While incorporating the combined cooling, heating and power system ...

Elsevier2017

Testing and modelling of a novel oil-free co-rotating scroll machine with water injection

Jürg Alexander Schiffmann, Luis Carlos Mendoza Toledo

Efficient compressed air energy storage requires reversible isothermal compression and expansion devices. The isothermal compression and expansion processes can either be approached by several stages with intercooling or by the more convenient injection of ...

Elsevier2017

Design, modeling and experimental validation of a novel finned reciprocating compressor for Isothermal Compressed Air Energy Storage applications

Alfred Rufer, Mahbod Heidari

Considering the need for a reliable and environmentally friendly energy storage solution for addressing renewable energy intermittency issue and following the developments on Isothermal Compressed Air Energy Storage (I-CAES) systems, a new finned piston co ...

Pergamon-Elsevier Science Ltd2017

Effect of replacement of silica fume with calcined clay on the hydration and microstructural development of eco-UHPFRC

Karen Scrivener, Mohammadhadi Kazemi Kamyab, Wei Sun, Wei Huang

In this paper, the replacement of high cost silica fume with calcined clay was investigated in UHPFRC mixes. The impact of two grades of calcined clay on the hydration and microstructural development of UHPFRC matrices was investigated, where 54% of the ce ...

Elsevier Sci Ltd2017

Rapid screening tests for supplementary cementitious materials: past and future

Karen Scrivener, Ruben Anton Snellings

Rapid screening tests for supplementary cementitious materials (SCMs) have been in use for over 150 years. Over the years a multitude of methods have been put forward to predict the strength development of SCMblended mortars and concrete. This paper summar ...

Springer2016

Comment on "Measurement of Ionospheric TEC in Spaceborne SAR Data"

Michael Jehle, Li Li

Two novel approaches for measuring the ionospheric total electron content (TEC) from single-polarized spaceborne SAR data were proposed in the mentioned paper, i.e., the TEC autofocus method and the systematic alternate up/down pulse methodology. The up/do ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Environomic design of vehicle integrated energy systems

Zlatina Kirilova Dimitrova

To meet the targets of sustainable development and greenhouse emission reduction of the future vehicles fleet, the automotive industry needs to deploy cost-competitive and efficient advanced energy conversion systems for the future commercial personal vehi ...

EPFL2015

Contribution to the Technique of Compressed Air Energy Storage : The Concept of Finned Piston

Mahbod Heidari

Development of intermittent solar and wind energies and the demand peak increase has made energy storage very important in energy policy. Thus, energy storage will play a key role in enabling the world to develop a low-carbon electricity system. An interes ...

EPFL2015

Thermo-Electric Analogy Method for Computing Transient Heat Transfer in a New Reciprocating Finned Piston Compressor

John Richard Thome, Alfred Rufer, Mahbod Heidari

In the framework of Isothermal Compressed Air Energy Storage (CAES), a new finned piston compressor has been designed and realized at LEI laboratory in EPFL. This system comprises a series of concentric annuli’s fitting into each other compressing the air ...

2014

Bond Graph Model Representation of a New Reciprocating Finned Air Compressor

Alfred Rufer, Mahbod Heidari

A new finned reciprocating air compressor model is developed recently for compressed air energy storage. First the mechanism of operation of the new compressor is described. The complexity of the design encouraged us to develop the model based on the bond ...

2014

The value of energy storage in optimal non-firm wind capacity connection to power systems

Mostafa Nick

Wind is a variable and uncontrollable source of power with a low capacity factor. Using energy storage facilities with a non-firm connection strategy is the key to maximum integration of distant wind farms into a transmission-constrained power system. In t ...

Pergamon-Elsevier Science Ltd2014

Innovative isothermal oil-free co-rotating scroll compressor-expander for energy storage with first expander tests

Daniel Favrat, Angel Iglesias

The development of an efficient isothermal turbine and compressor is essential for the realization of a small-scale compressed air energy storage (CAES). This article presents the theoretical development of an oil-free co-rotating scroll air compressor and ...

Elsevier2014

Analysis and Development of a New Compressor Device Based on The New Finned Piston

Alfred Rufer, Mahbod Heidari

In the general frame of Compressed Air Energy Storage system (CAES), the LEI Laboratory of EPFL has introduced the concept of dry finned piston. The main goal is to achieve energy storage by means of compressed air thanks to high isothermal efficiency comp ...

2013

Isothermal transcritical CO2 cycles with TES (thermal energy storage) for electricity storage

Daniel Favrat, Young Min Kim

Recently, TEES (thermo-electric energy storage) systems have been proposed as a new method for large-scale energy storage wherein electric power is stored as thermal energy by using a heat pump and retrieved from the TES (thermal energy storage) by using a ...

Elsevier2013

Driving and Filling Personal Vehicles – The Questions of Energy - and Power - Density ( A Fast Filling Station for the Compressed Air Car )

Alfred Rufer, Sylvain Lemofouet-Gatsi, Mahbod Heidari, Arnaud Leuba

In the context of the development of zero emissions personal vehicles, compressed air cars have been proposed, as alternative solutions to electric solutions, with a small energy content leading to a limited range, but with interesting properties regarding ...

2011