EuroSun2008-5

Model description

1.1. Validated models

Validated models are used for the parameter analyses [4]. The validation was carried out in 2007 with measurement data from the four different evacuated tubular solar collectors tested in a test facility at the Technical University of Denmark. In Table 1 the values used and determined in the validation process are shown.

Table 1. Parameters for the four solar collectors.

Parameter

Seido

5-8

Seido

1-8

Seido

10-20

Curved

Seido

10-20

Flat

Collector type

Total gross area of the collectors [m2]

2.07

2.07

3.53

3.53

Transparent area of the collectors [m2]

1.38

1.38

2.25

2.25

Number of tubes [-]

8

8

20

20

Glass tube radius [m]

0.05

0.05

0.035

0.035

Tube centre distance [m]

0.120

0.120

0.09026

0.09026

Collector panel tilt [°]

67

67

67

67

Collector azimuth [°]

0

0

0

0

Incidence angle modifier for the diffuse radiation [-]

0.9

0.9

0.9

0.9

Effective transmittance - absorptance product, [-]

0.83

0.83

0.83

0.83

Number of discretizations for the absorber [-]

41

41

33

15

Angle dependence of tau-alpha product based on tangent equation [-]

3.8

3.8

3.8

3.8

Heat capacity of the fluid in the manifold tube [kJ/kgK]

3.8

3.8

3.8

3.8

Heat pipe length [m]

1.73

1.73

1.61

1.61

Absorber radius [m] / Absorber width [m]

0.041

0.085

0.027

0.056

Angle of strip [°]

164

-

164

-

Thickness of strip [mm]

0.47

0.47

0.60

0.60

Thermal conductivity of strip [W/mK]

238

238

238

238

Density of strip [kg/m3]

2700

2700

2700

2700

Heat capacity of strip [kJ/kgK]

0.896

0.896

0.896

0.896

Lowest evaporation temperature [°C]

15

15

15

15

Manifold heat exchange capacity rate [W/K]

10

10

10

10

Mass of the fluid inside the heat pipe [kg]

0.0038

0.0038

0.0038

0.0038

Effective heat capacity of the collector [kJ/K]

4.04

3.41

6.31

4.94

EuroSun2008-5

Automatic Control System

The whole automation system is mainly divided into two parts: one part is the hardware equipments consisted of all kinds of devices used in the testing system; the other part …

The application of the regulations minimal solar collector area

Following the new regulations, a three bedrooms autonomous zone must have a minimal collector area of 4 m2 independently of the climate zone were is located. From the simulations results …

Measured sequences used for validation purposes

The comparison of experimental and calculated instantaneous power results, obtained after the different approaches presented in the previous section, is based on instantaneous efficiency measurements for a CPC collector (C …

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