EuroSun2008-2

Condenser and evaporator models

The condenser and the evaporator are modeled by means of the є-NTU method for counter-flow heat exchangers. The heat exchanger is subdivided into 3 zones, each of them being characterized by a heat exchange coefficient U. Figure 4 shows the 3-zones heat exchanger in the case of an evaporator.

Tsf, ex, ev T Sf

,ex, ev, tp

Tsf, su, ev, tp Tsfsue

Tr. su. ev Tr. su. ev. tp - Tev Tr ex. ev. tp Tr. ex. ev

Figure 4 Three zones moving boundary evaporator model

The AU heat transfer coefficient is calculated by considering two resistances in series (secondary fluid and refrigerant sides). The nominal heat transfer coefficients are identified for a nominal flow rate.

The coefficients are then obtained by: h = h ■ M 0,8

n n

This relationship can be justified by the Reynold’s analogy for a turbulent flow through a pipe [2] by assuming that the fluid properties, not included in this expression, remain unchanged.

Pump model

The pump is modeled by its swept volume, its isentropic efficiency (nPP, s) and its motor efficiency (nPP, m)- The two latter are supposed to be constant. The pump electrical consumption and the fluid flow rate are given by :

Подпись: pp,ssh, pp

image117

Л pp, m Л pp, s.^ pp, m

3. Experimental study

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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