EuroSun2008-2

Expander model validation

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The parameters of the expander model are identified using test results. They are adjusted to fit the three model outputs (supply pressure, exhaust temperature, shaft power) to experimental data. The input variables of this calculation are: expander rotation speed, fluid flow rate, supply temperature and exhaust pressure. An error-objective function is defined, that should be minimized: this error function is a weighted sum of the relative errors for each output. It is defined as follows:

The parameters that minimize the objective function F are identified by means of a genetic algorithm. Given these parameters, the predicted and measured outputs can be compared:

• A maximum error of 3 K is reached for the prediction of the exhaust temperature.

• The supply pressure is predicted with a maximum relative error of 2.3%.

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The expander shaft power is predicted with a maximum deviation of 6% (Figure 6).

EuroSun2008-2

Validation of the library components

The validation of the models is necessary to ensure that the calculated results are valid. Furthermore it is to proof what differences consist due to the assumptions made in the …

Solar industrial process heat plants in operation

Data gathered in the framework of the IEA Task 33/IV include comprehensive information about the geographical distribution of the solar thermal plants, the industrial sectors addressed, the specific processes, the …

Experimental Investigations On Solar Driven Desalination Systems Using Membrane Distillation

J. Koschikowski*, M. Wieghaus*, M. Rommel*, Vicente Subiela Ortin**, Baltasar Penate Suarez**, Juana Rosa Betancort Rodriguez** * Fraunhofer Institute for Solar Energy Systems ISEHeidenhofstr.2,79110 Freiburg, GermanyTel +49-761-4588-5294Fax +49-761-4588-9000email ioako@ise. fhg. …

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