Overall statement:

The paper presents a brief review of innovative research in cooling PV modules. The authors performed the standard review model for PV/T systems which follows the taxonomy of PV/T collectors.

The strengths:

1) The paper is well organized with efforts to distinguish each method used for PV cooling. 2) The proposed provides a table of summary, which shows some of the efficiencies of PV/T systems. 3) Illustrative figures from other studies are offered.

Weaknesses

1. The methods described are only active methods. Not much discussion of passive cooling methods.
2. Table 1 does not specify the type of efficiency, whether electrical, thermal, or combined.

Minor points:

1. Section 2.3 “couldbe” the two words should be separated.
2. Section 2.3 “conditions is substantially higher than that of PVT-Water.” formatting error and "is" should be replaced with "are".
3. Table 1, the first entry for material “Mono pass sheet and fin” is not clear.

Future works:

To consider conducting a review of innovative passive methods of PV cooling and passive circulation in PV/T systems. Overall, I believe reviews in PV/T and solar energy are very important and helpful to put the existing literature into perspective and I believe the authors did a good job in elaborating the concepts and describing works done by different researchers.

• This is a post-publication review. The adherence to journal guidelines is not considered as the paper has already been processed by editorial team of the journal.

• Furthermore, I would like to congratulate the authors on their review paper.