Hello everybody;
I am looking for an unglazed collector type, within i can enter parameters of the standard EN 12975-2 : bu, b1, b2 (respectively collector efficiency coefficient (m-1s), heat loss coefficient (Wm-2K-1) and collector efficiency coefficient (Wsm-3K-1)).
I found the types 553 and 559 but i can't find the documentation, apparently the model relies on algorithms supplied by the solar collector text: "Solar Engineering of Thermal Processes by Duffie and Beckman".
Where can I find this document? and what's the difference between type 553 and 559 ?
Thanks in advance for any information/advice;
Rajaa.