Parameter Variations

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A closer look on the results of dimensioning the base case leads to a comprehensive knowledge about the MaxLean system behaviour and the advantages of the concept. To gain insight into the influence the components have on the optimised system, a number of parameter variations were performed. For each variation a new optimisation procedure was carried out leading to different curves in the cost/savings diagram. Figure 3 gives an overview of the parameters varied and the results of the optimisation runs.

Подпись:variation

* base case

• best points

Fig. 3. Cost benefit diagrams of the parameter variations. The triangular dots in the respective charts
represent the dimensioning of the base case. The circular dots are the associated best points, generated with
the varied parameters. a) Cost of solar collector: 100 % to 70 % of the initial price. b) Efficiency curve of
solar collector: , From a low efficiency to a high efficiency flat plate collector. c) Cost of storage tank: 100 %
to 60 % of the initial price. d) Insulation of storage tank: 7.5 cm to 17.5 cm. e) Variation of the rise in energy

prices. 1.3 %/a to 7.5 %/a.

– Portugal *

Variation

cost/benefit

ratio

[€/kWhprlmary]

additional

cost

[€/a]

primary energy savings

[kWhpnmary/a]

V store

[m3]

Acollecotr

[m2]

Base Case

0.077

347

4502

0.67

8.9

95

0.075

340

4552

0.67

9.2

cost of solar

90

0.072

328

4552

0.67

9.2

/£ /

collector

85

0.069

322

4653

0.65

10

/ €

[% of initial

80

0.067

325

4863

0.69

11

cost]

75

0.064

312

4876

0.67

11.3

70

0.061

307

5032

0.67

12.4

Table 1. Results of the optimised systems generated by dimensioning the MaxLean system with varying parameters.

95

0.075

336

4502

0.67

8.9

90

0.072

326

4502

0.67

8.9

cost of

85

0.07

316

4502

0.67

8.9

storage tank

80

0.068

306

4502

0.67

8.9

V/

[% of

75

0.066

295

4502

0.67

8.9

initial cost]

70

0.063

283

4476

0.67

8.8

65

0.061

270

4444

0.71

8.4

60

0.058

260

4444

0.71

8.4

0.075

0.091

428

4701

0.77

12

0

f

insulation of

a

0.1

0.084

398

4743

0.75

11

|

storage tank

n

0.125

0.08

371

4639

0.69

10.1

[m]

0.175

0.075

339

4517

0.65

8.8

rise in

3

0.066

296

4502

0.67

8.9

£

energy prices

5

0.049

218

4479

0.65

9

—J

[%/a]

7.5

0.02

93

4594

0.67

9.5

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