Hi Pr Abdala 

I think that flat plat solar collector will do the job in this rang of temperature ( you can reach 80 to 90 C ). With evacuated tube collector you can reach 120 C.

In my research, I use the Evacuated Tube Solar Collector. i can reach 120 C. 

According to the attached reference the authors states that '' The desorber temperatures needed for the LiBr–water pair are in the range between 75 and

120 C. As a consequence, flat plate collectors, compound parabolic collectors and evacuated tube collectors that are easy to install and operate can be manipulated.''

Dear Kamal, 

check this paper as well it may help you. 

Dear Prof Kamal

I think you need to test the evacuated tube thoroughly, in design and manufacture to get to the norm of 120 C 

Dear Prof Kamal

Please check the attached paper of S. A. Kalogirou, 2004, ''Solar thermal collectors and applications'' , it could be useful for you.

Best Regards

Dear prof kamal,

i dont think so you need to change the collector. you need to check you collector direction and tilt angle. these are two important factors for collector performance. for you location you can check best direction and angle these from NASA SSE data.

Dear Prof Kamal,

I totally agree with the answer provided by Mr. Gamal Hashem for the operation range of the ETCs which reaches up to 150C depending also on the location (and hence the solar radiation). I am also using ETC in my model with outlet temperatures (120-150C).

Also, Mr. Nabil Elsharif provided a very good article about the types of the solar collectors and their applications.

Respected sir,

I m also working on the LiBr water absorption cycle.I m going to use solar evacuated tube collector.With this ETC technology we can easily attain up to 80-100 C temperature.

hi sir,

i am working on TRNSYS simulation. if you share your system specification, i can simulate it and can find out the problem u are facing or can suggest you the operation parameters.