15.07.2015   EuroSun2008-3

Model and parameters

The model of the power outputs calculated in the performed simulations is described by the following equations and parameters [2].

P = ‘HobKtaGb +^odGd — a1((Tout+Tin)/2-Tamb)- a2((Tout+Tin)/2-Tamb)2 (1)

where Kta = 1-bo(1/cos0-1) (2)

Подпись: Monitored parameters: P Power from collector (W/m2 ) Gb Beam Irradiance (W/m2 ) Gd Diffuse Irradiance (W/m2 ) Tin Inlet temperature Tout Outlet temperature Tamb Ambient temperature Glazed areas: Aactive elect.= 3.5m2 Solar8 electric active glazed area Aactive tamp 3.7m2 Solar8 thermal active glazed area ASolarS= 4.6m2 Solar8 total glazed area Подпись: Parameters in the collector model: qob Beam efficiency a1 Heat loss factor [W/m2 K] a2 factor [W/m2 K2] Temperature dependence of heat loss a=a1+a2*AT (4) Kta Angle of incidence modifier for beam irradiance bo Angular coefficient Kdiffuse Diffuse incident angle modifier 0 Angle of incidence onto the collector [°]

qod=Kdiffuse*qob (3)

Simulation Parameters:

Table 2. Systems parameters introduced in the performed simulations with Winsun software.

Solar system

Поь (-)

Kdiffuse (-)

aj (W/m2 oC)

a2 (W/m2 oC2)

be (-)

Thermal Solar8 per active glazed area

0.64

0.1

3.09

0

0.1

Electrical Solar8 per active glazed area (50 oC)

0.076

0.1

0

0

0.1

Flat plate collector (50 oC)

0.8

0.9

3.5

0

0.1

PV module (25 oC)

0.16

0.9

0

0

0.1