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Open AccessArticle

Energy Saving in an ETC Solar System to Produce High Temperature Water

Agroforestry Engineering Department, School of Agricultural, Food and Biosystems Engineering, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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Energies 2018, 11(4), 840; https://doi.org/10.3390/en11040840
Received: 26 February 2018 / Revised: 23 March 2018 / Accepted: 27 March 2018 / Published: 4 April 2018
(This article belongs to the Special Issue Urban Generation of Renewable Energy and Energy Saving in Cities)
The use of solar water heating systems (SWHS) based on evacuated tube collectors (ETC) has experienced rapid growth in the residential sector. In contrast, the implementation of these systems in the industrial sector is very limited, due in part to the demand of a higher temperature in water. Taking into account that the final energy of the industrial sector is similar to the residential sector, to increase the generation of renewable energy and energy saving in cities, efforts in this sector should be redoubled. Therefore, the present work characterises the behaviour of a SWHS-ETC with active circulation to produce hot water at 90 °C, determining its performance, energy saving and profitability in different scenarios in Europe. The annual energy savings generated by the SWHS Range between 741 and 435 kWh m−2 (reduction of emissions between 215 and 88 kg CO2 m−2). The results of the analysis of profitability, studying the variation of the conventional energy price, the cost of the investment, the useful life and the energy supplied, in thousands of scenarios, are a valuable tool for correct decision making, as they can be of great utility to increase the implementation of these systems in the industrial sector. View Full-Text
Keywords: solar water-heating system; evacuated-tube collector; high temperature; energy saving solar water-heating system; evacuated-tube collector; high temperature; energy saving
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MDPI and ACS Style

Porras-Prieto, C.J.; Lizcano, J.; García, J.L.; Mazarrón, F.R. Energy Saving in an ETC Solar System to Produce High Temperature Water. Energies 2018, 11, 840.

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