Abstract
The industrial sector has a great opportunity to reduce its energy costs through distributed generation. In this sense, the potential of photovoltaic self-consumption systems in the industrial cooling and refrigeration sector is shown. Two industries with photovoltaic self-consumption installations are shown and the electricity consumption profile of this type of industry which has a remarkable basal electricity consumption during daytime is analyzed. The matching between consumption and photovoltaic generation profiles is provided through the self-consumption and self-sufficiency curves considering different reporting periods (monthly and annual). Moreover, a new index is presented: self-sufficiency index for sunshine hours, φSS,SH. This index evaluates the performance of the photovoltaic self-consumption system when facing the consumption only during sunshine hours. This index may complement the self-sufficiency index and may improve the analysis of this type of systems in the industrial sector. Self-consumption indices of 90% may be provided. Moreover, self-sufficiency indices for total (24 h) and for sunshine hours of 25% and 50%, respectively, for industry A, and 26% and 45% for industry B have been obtained. During daytime, half the load consumption in this type of industry may be covered by photovoltaics while achieving high levels of use of the photovoltaic energy generated.
Highlights
Renewable energies have gradually increased their contribution to global primary energy consumption; in 2018 they accounted for 10.8% of the total, according to the Association of RenewableEnergy Companies (APPA)
Given that the consumption profiles of companies tend to be very varied, depending on the power consumption, the equipment required for their production processes and the production schedules, this index will make it possible to quantify the level of matching of the generation and consumption profiles exclusively in the hours when photovoltaic generation exists
Considering the different self-sufficiency and self-consumption curves shown in Figures 7 and 8, it can be indicated that the photovoltaic self-consumption system of 52.8 kW currently installed in industry A could increase its peak power up to 180 kWp while maintaining a self-consumption index of 100% and self-sufficiency indices, total and for sunshine hours, of 14 and 30%, may be achieved, respectively
Summary
Renewable energies have gradually increased their contribution to global primary energy consumption; in 2018 they accounted for 10.8% of the total, according to the Association of Renewable. Given that the consumption profiles of companies tend to be very varied, depending on the power consumption, the equipment required for their production processes and the production schedules, this index will make it possible to quantify the level of matching of the generation and consumption profiles exclusively in the hours when photovoltaic generation exists This parameter can be of significant interest since it indicates the level of coverage of this technology, limiting itself exclusively to the consumption existing in the period of time in which this energy source is active.
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