Constant pressure hydraulic energy storage through a variable area piston hydraulic accumulator

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Hydraulic accumulators are used in a variety of applications to minimize the pressure variation in hydraulic circuits and to store energy. Conventional hydraulic accumulators suffer from two major limitations, the hydraulic system pressure varies with the quantity of energy stored and the energy density is significantly lower than other energy domains. In this paper, a novel hydraulic accumulator is presented that uses a piston with an area that varies with stroke to maintain a constant hydraulic system pressure while the gas pressure changes. The variable area piston is sealed with a fabric reinforced rolling diaphragm. In this work, the piston radius profile is developed as a function of the piston displacement and then transformed into a function of the axial contact location between the piston and the diaphragm. The piston profile was solved numerically for a variety of conditions using both transformation methods to illustrate the geometric design trade-offs. Using a variable area gas piston with a fixed cylinder area, the maximum gas volume ratio was 1.8:1. An analysis of the energy density revealed that the constant pressure accumulator provides a 16% improvement in energy density over a conventional accumulator at a volume ratio of 2.71:1 and also exceeds the maximum energy density of a conventional accumulator at the lower volume ratio of 1.8:1. This new promising technology maintains a constant hydraulic system pressure independent of the quantity of energy stored, easing system control and allowing other circuit components to be downsized to meet the same power requirements, while also increases the energy storage density.

Original languageEnglish (US)
Pages (from-to)262-270
Number of pages9
JournalApplied Energy
Volume105
DOIs
StatePublished - Jan 1 2013

Fingerprint

Hydraulic accumulators
Pistons
Energy storage
Hydraulics
hydraulics
energy
Diaphragms
Piston displacement
Gases
Networks (circuits)
gas
accumulator
energy storage
Control systems
control system

Keywords

  • Constant pressure
  • Energy storage
  • Hydraulic accumulator
  • Rolling diaphragm

Cite this

Constant pressure hydraulic energy storage through a variable area piston hydraulic accumulator. / Van De Ven, James D.

In: Applied Energy, Vol. 105, 01.01.2013, p. 262-270.

Research output: Contribution to journalArticle

@article{fc8374d425304998969818406adbef69,
title = "Constant pressure hydraulic energy storage through a variable area piston hydraulic accumulator",
abstract = "Hydraulic accumulators are used in a variety of applications to minimize the pressure variation in hydraulic circuits and to store energy. Conventional hydraulic accumulators suffer from two major limitations, the hydraulic system pressure varies with the quantity of energy stored and the energy density is significantly lower than other energy domains. In this paper, a novel hydraulic accumulator is presented that uses a piston with an area that varies with stroke to maintain a constant hydraulic system pressure while the gas pressure changes. The variable area piston is sealed with a fabric reinforced rolling diaphragm. In this work, the piston radius profile is developed as a function of the piston displacement and then transformed into a function of the axial contact location between the piston and the diaphragm. The piston profile was solved numerically for a variety of conditions using both transformation methods to illustrate the geometric design trade-offs. Using a variable area gas piston with a fixed cylinder area, the maximum gas volume ratio was 1.8:1. An analysis of the energy density revealed that the constant pressure accumulator provides a 16{\%} improvement in energy density over a conventional accumulator at a volume ratio of 2.71:1 and also exceeds the maximum energy density of a conventional accumulator at the lower volume ratio of 1.8:1. This new promising technology maintains a constant hydraulic system pressure independent of the quantity of energy stored, easing system control and allowing other circuit components to be downsized to meet the same power requirements, while also increases the energy storage density.",
keywords = "Constant pressure, Energy storage, Hydraulic accumulator, Rolling diaphragm",
author = "{Van De Ven}, {James D}",
year = "2013",
month = "1",
day = "1",
doi = "10.1016/j.apenergy.2012.12.059",
language = "English (US)",
volume = "105",
pages = "262--270",
journal = "Applied Energy",
issn = "0306-2619",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Constant pressure hydraulic energy storage through a variable area piston hydraulic accumulator

AU - Van De Ven, James D

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Hydraulic accumulators are used in a variety of applications to minimize the pressure variation in hydraulic circuits and to store energy. Conventional hydraulic accumulators suffer from two major limitations, the hydraulic system pressure varies with the quantity of energy stored and the energy density is significantly lower than other energy domains. In this paper, a novel hydraulic accumulator is presented that uses a piston with an area that varies with stroke to maintain a constant hydraulic system pressure while the gas pressure changes. The variable area piston is sealed with a fabric reinforced rolling diaphragm. In this work, the piston radius profile is developed as a function of the piston displacement and then transformed into a function of the axial contact location between the piston and the diaphragm. The piston profile was solved numerically for a variety of conditions using both transformation methods to illustrate the geometric design trade-offs. Using a variable area gas piston with a fixed cylinder area, the maximum gas volume ratio was 1.8:1. An analysis of the energy density revealed that the constant pressure accumulator provides a 16% improvement in energy density over a conventional accumulator at a volume ratio of 2.71:1 and also exceeds the maximum energy density of a conventional accumulator at the lower volume ratio of 1.8:1. This new promising technology maintains a constant hydraulic system pressure independent of the quantity of energy stored, easing system control and allowing other circuit components to be downsized to meet the same power requirements, while also increases the energy storage density.

AB - Hydraulic accumulators are used in a variety of applications to minimize the pressure variation in hydraulic circuits and to store energy. Conventional hydraulic accumulators suffer from two major limitations, the hydraulic system pressure varies with the quantity of energy stored and the energy density is significantly lower than other energy domains. In this paper, a novel hydraulic accumulator is presented that uses a piston with an area that varies with stroke to maintain a constant hydraulic system pressure while the gas pressure changes. The variable area piston is sealed with a fabric reinforced rolling diaphragm. In this work, the piston radius profile is developed as a function of the piston displacement and then transformed into a function of the axial contact location between the piston and the diaphragm. The piston profile was solved numerically for a variety of conditions using both transformation methods to illustrate the geometric design trade-offs. Using a variable area gas piston with a fixed cylinder area, the maximum gas volume ratio was 1.8:1. An analysis of the energy density revealed that the constant pressure accumulator provides a 16% improvement in energy density over a conventional accumulator at a volume ratio of 2.71:1 and also exceeds the maximum energy density of a conventional accumulator at the lower volume ratio of 1.8:1. This new promising technology maintains a constant hydraulic system pressure independent of the quantity of energy stored, easing system control and allowing other circuit components to be downsized to meet the same power requirements, while also increases the energy storage density.

KW - Constant pressure

KW - Energy storage

KW - Hydraulic accumulator

KW - Rolling diaphragm

UR - http://www.scopus.com/inward/record.url?scp=84873307293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84873307293&partnerID=8YFLogxK

U2 - 10.1016/j.apenergy.2012.12.059

DO - 10.1016/j.apenergy.2012.12.059

M3 - Article

AN - SCOPUS:84873307293

VL - 105

SP - 262

EP - 270

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -