Concentrated Solar Power with multijunction cells

Dear Paul,
Thank's a lot for your answer.
Can you please send me back the relation between DNI and concentration(suns) with more parenthesis because I don't know if I should divide or multiply by 1000?

Thank's a lot in advance,
Zaynab

Dear Zaynab,

Here is an example:

Concentration ratio = 700 X
Concentration = 630 Suns
1 Sun = 1000 W/m2

DNI = 630 / 700 * 1000 = 900 W/m2

Best regards,
Paul.

Thank's a lot !

Dear paul
Is "sun concentration" and "concentration(suns)" same or not?
For example i want enter efficiency for concentration=960suns,DNI=600W/m2,concentration ratio=1600 but the Data sheet has the efficiency as a function of sun concentration in standard condition of 1000W/m2.
Is it OK to use the efficiency of sun concentration=960 in standard condition of 1000W/m2.

Hello,

The concentration in Suns is another way of describing the irradiance in W/m2 given a concentration ratio. You can use the equation I provided above to convert between the two.

Best regards,
Paul.

Dear paul

Yes i know that but the data sheet has gave the efficiency of sun concentration in 1000 W/m2 not for example in 900 W/m2.

If you send me an email i can send u the data sheet to see what i mean.

I have another question too,what number should i put as packing factor in hcpv what's the difference with GCR in PV system?

thank you
saeed