실험에 의한 공기식 PVT 컬렉터의 열·전기 성능에 관한 연구

An Experimental Study on Thermal and Electrical Performance of an Air-type PVT Collector

Abstract

PVT (Photovoltaic/thermal) system is technology that combines PV and solar thermal collector to produce and use both solar heat and electricity. PVT has the advantage that the energy production per unit area is higher than any single use of PV or solar thermal energy systems because it can produce and use heat and electricity simultaneously. Air-type PVT collectors use air as the heat transfer medium, and the air flow rate and flow pattern are important factors affecting the performance of the PVT collector. In this study, a new air-type PVT collector with improved thermal performance was designed and manufactured. And then thermal and electrical performance and characteristics of air-type PVT collector were analyzed through experiments. For the thermal performance analysis of the PVT collector, the experiment was conducted under the test conditions of ISO 9806:2017 and the electrical performance was analyzed under the same conditions. As a result, the thermal efficiency increased to 26~45% as the inlet flow rate of PVT collector increased from $60{\sim}200m^3/h$. Also, it was confirmed that the air-type PVT collector prevents the PV surface temperature rise according to the operating conditions.

Fig. 1 Schematic diagram of air-type PVT collector design¹⁰⁾

Fig. 2 Experiment of air-type PVT collector

Fig. 3 Thermal and electrical efficiency of PVT collector

Fig. 4 Thermal efficiency by air flowrate

Fig. 5 Air temperature rise of inlet and outlet by air-flowrate

Fig. 6 Maximum PV power by irradiance

Fig. 7 Maximum PV power by average PV temperature

Table 1 PV module specification

Table 2 Permitted deviation of measured parameters during a measurement period³⁾