Efficiency and sustainability assessment of evaporative cooling of photovoltaics

Tej Žižak (Author), Suzana Domjan (Author), Sašo Medved (Author), Ciril Arkar (Author)

Abstract

The cooling of PV has been shown to increase electricity production. Among passive techniques, evaporative cooling has one of the greatest potentials. In this work, the efficiency and sustainability of this technique have been investigated for various climatic conditions. In-situ experiments were conducted to develop parametric models for PV cell temperatures and back surface convective heat transfer coefficient. Experiments have revealed an up to 20.1 °C lower peak PV temperature and up to 9.6% increased electric power. Year-round analysis was made for eight cities to determine the required roof size to capture precipitation and the volume of rainwater storage for sustainable evaporative cooling. The study shows that sustainable PV evaporative cooling is possible in cities with temperate and continental climates, where 1–3 m$^2$ of roof area and 50–150 l of rainwater storage are needed for 1 m$^2$ of PV. The annual electricity production can increase by 5.9–9.4 kWh/m$^2$a, which is a 3.6–4.6% increase. In the semi-arid climate of Lampedusa, a roof above 4 m$^2$ and a storage of up to 500 l per m$^2$ of PV are required. In the desert climate of Almeria and Athens, sustainable evaporative cooling is not feasible.

Keywords

evaporative cooling;PV cells;in-situ experiments;cooling water demand;rainwater storage;optimization;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	620.9
COBISS:	108992259
ISSN:	0360-5442
Views:	829
Downloads:	252
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	hlapilno hlajenje;fotonapetostne celice;meritve v naravnem okolju;voda za hlajenje;zalogovnik deževnice;optimizacija;
Type (COBISS):	Article
Pages:	str. 1-12
Volume:	ǂVol. ǂ254
Issue:	ǂpt. ǂA
Chronology:	Sep. 2022
DOI:	10.1016/j.energy.2022.124260
ID:	15406889