“…After analysis, it was found that the authors classified the PVT systems based on several criteria. For example, classification obtained based on heat extraction medium is shown in [46][47][48]51,[53][54][55]59,62,[65][66][67]69], classification based on the overall system's is discussed in [39,49,50,57,60,61,63,64], and classification based on the PVT system's design is shown in [52,56,58,68]. The overview of different criteria of classification discussed in the papers is shown in Figure 8.…”