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CRITERIA FOR DESIGNING A SOLAR SYSTEM

When designing a solar system we need to have information to decide on the most suitable system. This basic information, common for the design of any solar system, consists of data related to:

Needs of user and setting up conditions

Orientation and inclination of surface available for setting up

Local weather patterns

Project globality

This information along with appropriate simulation programmes allows us to correctly design the solar system.

The use of tables or extremely easy-to-use calculation programmes simplifies the effective design of a natural flow solar system.

Here follows an example with tables for calculating the model of a natural flow thermal solar system.

 

CALCULATION EXAMPLE

Application: Thermal

Location: Salamanca 41ºN

DATA RESULTS

 

Inclination: 50º

Deviation N-S: 0º

Time adjustment : 1.00

Global loss :15%

Number of users: 10

Litres per user a day: 60

Collector area : 2.13m2

B and M parameters: 0.83, 4.18

Usage temperature : 45º C

Kw.h cost: 0.1

 

Annual demand : 24438 MJ

Sqm (Square metre) per year power: 2344 MJ

Solar contribution : 77.8%

Energetic deficit : 5414 MJ

Annual saving : 529

Auxiliary energy cost: 151

Collector surface : 10.7 m2

Number of collectors : 5

 

 

MONTHLY FIGURES
  1 2 3 4 5 6 7

8

JAN 70 13.0 5 40 520 2179 70.3 6.1
FEB 70 11.8 6 39 458 1918 68.5 9.5
MAR 70 13.0 8 37 481 2015 65.0 13.5
APR 70 12.6 10 35 441 1845 61.5 17.1
MAY 70 13.0 11 34 442 1852 59.7 19.7
JUN 70 12.6 12 33 415 1739 58.0 22.8
JUL 100 18.6 13 32 595 2490 80.3 24.6
AUG 100 18.6 12 33 613 2568 82.8 22.6
SEP 70 12.6 11 34 428 1792 59.7 17.5
OCT 70 13.0 10 35 455 1906 61.5 11.3
NOV 70 12.6 8 37 466 1950 65.0 7.4
DEC 70 13.0 5 40 520 2179 70.3 5.2

 

MONTHLY FIGURES
  9 10 11 12 13 14 15

16

JUN 6.1 1.42 8.14 8 282 6 57.7 20.4
FEB 9.5 1.3 11.61 9 358 7 44.3 33.7
MAR 13.5 1.14 14.47 9 446 10 32.8 45.3
APR 17.1 0.99 15.91 9.5 465 13 28.7 49.3
MAY 19.7 0.88 16.30 9.5 476 16 25.4 52.6
JUN 22.8 0.84 18.00 9.5 526 20 19.9 58.2
JUL 24.6 0.88 20.35 9.5 595 24 14.8 63.3
AUG 22.6 1.01 21.46 9.5 627 23 14.7 63.4
SEP 17.5 1.19 19.58 9 604 20 17.3 60.7
OCT 11.3 1.41 14.98 9 462 14 28.0 50.0
NOV 7.4 1.56 10.85 8 376 9 39.9 38.1
DEC 5.2 1.54 7.53 7.5 278 6 58.5 19.5

 

MONTHLY FIGURES
  17 18 19 20 21 22
JUN 1.66 1.41 43.7 465 21.3 1713
FEB 3.91 3.32 93.1 991 51.7 927
MAR 6.55 5.56 172.5 1837 91.1 178
APR 7.84 6.66 199.9 2129 100.0 0
MAY 8.57 7.28 225.8 2404 100.0 0
JUN 10.47 8.90 267.0 2843 100.0 0
JUL 12.87 10.94 339.2 3612 100.0 0
AUG 13.60 11.56 358.2 3815 100.0 0
SEP 11.89 10.10 303.1 3228 100.0 0
OCT 7.49 6.36 197.3 2100 100.0 0
NOV 4.13 3.51 105.4 1122 57.5 828
DEC 1.47 1.25 38.8 412 19.0 1766

 

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