Efficiency
• Basic efficiency
• Efficiency adjusting factor
• valuable collector
valuable collector

Efficiency adjusting factor

 

Collectors

Efficiency calculation

Optical efficiency n0

1st ORDER heat loss
a1

2nd ORDER heat loss
a2

Temp difference Tm-Ta

Solar Irradiance
G

Efficiency n

Collector type

AUCKLAT

0.696

0.4

0.015

50

800

0.624

TUBE U PIPE

CHANGZHOU CONS***

0.483

1.83

1.585

50

800

0.346

TUBE HEAT PIPE

JIANGSU SUNR***

0.65

1.585

0.002

50

800

0.545

TUBE HEAT PIPE

JIANGSU SUNR***

0.734

1.529

0.0166

50

800

0.587

TUBE U PIPE

CHINA HIM**

0.779

2.103

0.0107

50

800

0.614

TUBE U PIPE

APRIC**

0.656

2.063

0.006

50

800

0.508

TUBE HEAT PIPE

CONER**

0.804

4.076

0.0061

50

800

0.530

FLAT PANEL

RITT** SOLAR

0.642

0.885

0.01

50

800

0.584

TUBE U PIPE

ZHEJIANG SHENTA**

0.679

1.696

0.0099

50

800

0.542

TUBE HEAT PIPE

ABOVE DATA IS GIVEN TO APERATURE AREA.

Tm-Ta: Difference between collector out let and in let temperature. Here we give value of 50 which is the normal temperature you require your collector to rise.
G: The amount of solar energy which hits your collector absorbing element
a1, a2:1st and 2nd ORDER heat loss of your collector and the smaller value is the better performance your collector has.
Above TABLE gives you a comparison between efficiencies of different collectors when you want your collector to rise your cold water temperature by 50 degree.

COST COMPARASION

 

Aperture Area

h0

a1

a2

Solar isolation
kWh

 

Result kWh

 

Cost

 

Cost/kwh

AKU

1

0.696

0.4

0.015

1000

662

100

0.15

CHINA HIM**

1

0.779

2.103

0.0107

1000

614

100

0.16

JIANGSU SUNR***

1

0.734

1.529

0.0166

1000

587

100

0.17

RITT** SOLAR

1

0.642

0.885

0.01

1000

584

100

0.17

JIANGSU SUNR***

1

0.65

1.585

0.002

1000

545

100

0.18

ZHEJIANG SHENT**

1

0.679

1.696

0.0099

1000

542

100

0.18

CONER**

1

0.804

4.076

0.0061

1000

530

100

0.19

APRIC**

1

0.656

2.063

0.006

1000

508

100

0.20

CHANGZHOU CONS***

1

0.483

1.83

1.585

1000

346

100

0.29

If all above collectors are sold at same price, you pay least for per KW out put FROM AKU collector.