FPROPS - Revision history

Jpye: /* Using from C */

2015-03-24T02:01:31Z

Using from C

← Older revision		Revision as of 02:01, 24 March 2015
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	Using the FPROPS code from C should also be very straightforward once the relevant header files have been examined. Warning! We are still working on the API and it is subject to change, especially in the light of current [[GSOC2011]] work.		Using the FPROPS code from C should also be very straightforward once the relevant header files have been examined. Warning! We are still working on the API and it is subject to change, especially in the light of current [[GSOC2011]] work.

	A very simple test of selecting a fluid, then solving for (p,h) values and then returning results, is given in {{src\|models/johnpye/fprops/test_ph.c}} (''Note: this file is currently missing and needs to be ~~restore~~.''). An extract of that file is shown below:		A very simple test of selecting a fluid, then solving for (p,h) values and then returning results, is given in {{src\|models/johnpye/fprops/test_ph.c}} (''Note: this file is currently missing and needs to be restored.''). An extract of that file is shown below:

	<source lang=c>		<source lang=c>

Jpye: /* Using from C */

2015-03-24T02:01:24Z

Using from C

← Older revision		Revision as of 02:01, 24 March 2015
Line 309:		Line 309:
	Using the FPROPS code from C should also be very straightforward once the relevant header files have been examined. Warning! We are still working on the API and it is subject to change, especially in the light of current [[GSOC2011]] work.		Using the FPROPS code from C should also be very straightforward once the relevant header files have been examined. Warning! We are still working on the API and it is subject to change, especially in the light of current [[GSOC2011]] work.

	A very simple test of selecting a fluid, then solving for (p,h) values and then returning results, is given in {{src\|models/johnpye/fprops/test_ph.c}}. An extract of that file is shown below:		A very simple test of selecting a fluid, then solving for (p,h) values and then returning results, is given in {{src\|models/johnpye/fprops/test_ph.c}} (''Note: this file is currently missing and needs to be restore.''). An extract of that file is shown below:

	<source lang=c>		<source lang=c>

Jpye: /* Testing the code */

2015-03-24T01:57:43Z

Testing the code

← Older revision		Revision as of 01:57, 24 March 2015
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	== Testing the code ==		== Testing the code ==

	FPROPS includes a suite of self tests for each fluid that has been implemented. Some of the test data comes from the publications from which the correlations have been taken; other test data comes from using the commercial package [http://www.nist.gov/srd/nist23.~~htm~~ REFPROP] to calculate some sample data points, and comparing the FPROPS output with that data.		FPROPS includes a suite of self tests for each fluid that has been implemented. Some of the test data comes from the publications from which the correlations have been taken; other test data comes from using the commercial package [http://www.nist.gov/srd/nist23.cfm REFPROP] to calculate some sample data points, and comparing the FPROPS output with that data.

	To run the FPROPS tests for a given fluid, <tt>cd</tt> to the FPROPS directory (eg <tt>cd ~/ascend/models/johnpye/fprops</tdd>) then run the test script <tt>./test.py ''fluidname''</tt>, for example:		To run the FPROPS tests for a given fluid, <tt>cd</tt> to the FPROPS directory (eg <tt>cd ~/ascend/models/johnpye/fprops</tdd>) then run the test script <tt>./test.py ''fluidname''</tt>, for example:

Jpye: /* Using within ASCEND */

2015-03-24T01:56:26Z

Using within ASCEND

← Older revision		Revision as of 01:56, 24 March 2015
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	'''Note'''. When solving properties in 'reverse' mode (eg solving for <span class="texhtml">ρ,''T''</span> when <span class="texhtml">''p'',''h''</span> are know), you will get significantly better results by switching the QRSlv solver parameter for 'convergence test' (convopt) to 'RELNOM_SCALE'. This significantly improves ASCEND's ability to solve these problems. Also, use <tt>OPTION iterationlimit 200</tt> for larger models.		'''Note'''. When solving properties in 'reverse' mode (eg solving for <span class="texhtml">ρ,''T''</span> when <span class="texhtml">''p'',''h''</span> are know), you will get significantly better results by switching the QRSlv solver parameter for 'convergence test' (convopt) to 'RELNOM_SCALE'. This significantly improves ASCEND's ability to solve these problems. Also, use <tt>OPTION iterationlimit 200</tt> for larger models.

	A first system model using FPROPS is available in {{src\|models/johnpye/rankine_fprops.a4c}}. The key part is		A first system model using FPROPS is available in {{src\|models/johnpye/fprops/rankine_fprops.a4c}}. The key part is
	<source lang="a4c">		<source lang="a4c">
	cd IS_A fluid;		cd IS_A fluid;

Jpye: fixed some outdated links to other packages

2015-03-18T02:38:41Z

fixed some outdated links to other packages

← Older revision		Revision as of 02:38, 18 March 2015
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	Currently FPROPS supports calculation of the properties of the pure substances shown on the right. The properties that can be calculated are internal energy <math>u</math>, entropy <math>s</math>, pressure <math>p</math>, enthalpy <math>h</math> and Helmholtz energy <math>a</math>, as well as various partial derivatives of these with respect to temperature and density.		Currently FPROPS supports calculation of the properties of the pure substances shown on the right. The properties that can be calculated are internal energy <math>u</math>, entropy <math>s</math>, pressure <math>p</math>, enthalpy <math>h</math> and Helmholtz energy <math>a</math>, as well as various partial derivatives of these with respect to temperature and density.

	FPROPS reproduces a limited subset of the functionality of commercial programs such as [http://www.nist.gov/srd/nist23.~~htm~~ REFPROP], [http://~~gibbs~~.mech.kyushu-u.ac.jp/~~~akasaka~~/~~propath_man~~/ PROPATH], EES, [http://www.ruhr-uni-bochum.de/~~thermo~~/~~Software~~/~~Seiten~~/~~Fluidcal-eng~~.~~htm~~ FLUIDCAL], SteamTab and others, but is free open-source software, licensed under the [http://www.gnu.org/licenses/gpl.html GPL]. Similar open-source libraries include [[freesteam]] and [http://coolprop.sourceforge.net CoolProp]. Contributions are most welcome!		FPROPS reproduces a limited subset of the functionality of commercial programs such as [http://www.nist.gov/srd/nist23.cfm REFPROP], [http://www.mech.kyushu-u.ac.jp/~heat/propath/ PROPATH], EES, [http://www.thermo.ruhr-uni-bochum.de/en/prof-w-wagner/software/fluidcal.html FLUIDCAL], SteamTab and others, but is free open-source software, licensed under the [http://www.gnu.org/licenses/gpl.html GPL]. Similar open-source libraries include [[freesteam]] and [http://coolprop.sourceforge.net CoolProp]. Contributions are most welcome!

	Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].		Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].

Jpye at 01:17, 5 March 2015

2015-03-05T01:17:00Z

← Older revision		Revision as of 01:17, 5 March 2015
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	Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].		Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].

	FPROPS is included in current versions of ASCEND, but you can also browse the source code at {{srcdir\|models/johnpye/fprops/}} (current trunk) or {{srcbranchdir\|fprops2\|models/johnpye/fprops/}}. Currently (Mar 2014), [[FPROPS/Viscosity\|viscosity]] and [[FPROPS/Thermal conductivity\|thermal conductivity]] correlations are being implemented in FPROPS.		FPROPS is included in current versions of ASCEND, but you can also browse the source code at {{srcdir\|models/johnpye/fprops/}} (current trunk) <!-- or {{srcbranchdir\|fprops2\|models/johnpye/fprops/}}-->. Currently (Mar 2014), [[FPROPS/Viscosity\|viscosity]] and [[FPROPS/Thermal conductivity\|thermal conductivity]] correlations are being implemented in FPROPS.

	== Implementation ==		== Implementation ==

Jpye: /* Implementation */

2014-03-27T12:53:40Z

Implementation

@@ Line 212: / Line 212: @@
 --> x = 0.500000
 </pre>
 == Testing the code ==

Jpye at 07:56, 25 March 2014

2014-03-25T07:56:25Z

← Older revision		Revision as of 07:56, 25 March 2014
Line 51:		Line 51:
	Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].		Enhancement to FPROPS feature set and list of supported fluids has been going on as part of ASCEND's involvement in [[GSOC]].

	FPROPS is included in current versions of ASCEND, but you can also browse the source code at {{srcdir\|models/johnpye/fprops/}} (current trunk) or {{srcbranchdir\|fprops2\|models/johnpye/fprops/}} and ~~{{srcbranchdir~~\|~~sean\|models/johnpye/fprops/}} (active development, as of Sept 2012)~~.		FPROPS is included in current versions of ASCEND, but you can also browse the source code at {{srcdir\|models/johnpye/fprops/}} (current trunk) or {{srcbranchdir\|fprops2\|models/johnpye/fprops/}}. Currently (Mar 2014), [[FPROPS/Viscosity\|viscosity]] and [[FPROPS/Thermal conductivity\|thermal conductivity]] correlations are being implemented in FPROPS.

	== Implementation ==		== Implementation ==

Jpye at 23:58, 9 December 2013

2013-12-09T23:58:36Z

← Older revision		Revision as of 23:58, 9 December 2013
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	{{fpropsfluid\|xenon}}		{{fpropsfluid\|xenon}}

	<small>408 cubic EOS fluids</small> {{fpropsfluid\|_rpp}} ~~<small>(data from Reid, Prausnitz & Poling 4th Ed.)</small>~~		<small>408 cubic EOS fluids:</small> {{fpropsfluid\|_rpp}}
	~~(in svn, at r4621)~~
	</div>		</div>
	'''FPROPS''' is a free open-source C-based library for high-accuracy evaluation of thermodynamic properties for a number of pure substances. It makes use of published data for the Helmholtz fundamental equation for those substances. It has been developed by [[User:Jpye\|John Pye]] and [[#Contributors\|others]], and will happily function as standalone code, but is also provided with [[external library]] code for ASCEND so that it can be used to access these accurate property correlations from within a [[MODEL]].		'''FPROPS''' is a free open-source C-based library for high-accuracy evaluation of thermodynamic properties for a number of pure substances. It makes use of published data for the Helmholtz fundamental equation for those substances. It has been developed by [[User:Jpye\|John Pye]] and [[#Contributors\|others]], and will happily function as standalone code, but is also provided with [[external library]] code for ASCEND so that it can be used to access these accurate property correlations from within a [[MODEL]].

Jpye at 23:57, 9 December 2013

2013-12-09T23:57:51Z

← Older revision		Revision as of 23:57, 9 December 2013
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	'''Fluids supported by FPROPS'''		'''Fluids supported by FPROPS'''

	<small>~~High~~-accuracy Helmholtz ~~correlations~~</small> {{fpropsfluid\|acetone}},		<small>38 high-accuracy Helmholtz fluids:</small> {{fpropsfluid\|acetone}},
	{{fpropsfluid\|ammonia}},		{{fpropsfluid\|ammonia}},
	{{fpropsfluid\|butane}},		{{fpropsfluid\|butane}},
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	{{fpropsfluid\|xenon}}		{{fpropsfluid\|xenon}}

	<small>~~Cubic~~ EOS:</small> {{fpropsfluid\|_rpp}} <small>(~~406 more:~~ Reid, Prausnitz & Poling 4th Ed.)</small>		<small>408 cubic EOS fluids</small> {{fpropsfluid\|_rpp}} <small>(data from Reid, Prausnitz & Poling 4th Ed.)</small>
	(in svn, at r4621)		(in svn, at r4621)
	</div>		</div>