Next Article in Journal
Rev-Changes in Primary Energy Use and CO2 Emissions—An Impact Assessment for a Building with Focus on the Swedish Proposal for Nearly Zero Energy Buildings
Next Article in Special Issue
Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings
Previous Article in Journal
System-Level Value of a Gas Engine Power Plant in Electricity and Reserve Production
Previous Article in Special Issue
A Non-Ventilated Solar Façade Concept Based on Selective and Transparent Insulation Material Integration: An Experimental Study
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessCommunication
Energies 2017, 10(7), 985;

Alternative for Summer Use of Solar Air Heaters in Existing Buildings

Department of Energy Engineering and Fluidmechanics, University of Valladolid, 47002 Valladolid, Spain
CARTIF Technology Centre, Parque Tecnológico de Boecillo, 205, Boecillo, 47151 Valladolid, Spain
Author to whom correspondence should be addressed.
Academic Editors: Hongxing Yang, Jinqing Peng and Dimitrios Karamanis
Received: 24 May 2017 / Revised: 4 July 2017 / Accepted: 5 July 2017 / Published: 12 July 2017
(This article belongs to the Special Issue Solar Energy Application in Buildings)
Full-Text   |   PDF [4000 KB, uploaded 17 July 2017]   |  


Among solar thermal technologies for indoor heating, solar air heaters (SAH) are appealing for implementation on existing buildings due to their simplicity, fewer risks related to the working fluid, and possible independence from the building structure. However, existing research work mainly focuses on winter use and still fails in providing effective solutions for yearly operation, which would enhance their interest. With the aim of analysing an alternative summer use, this work firstly characterises a double channel-single pass solar air collector through experimentation. From the obtained results, modelling and simulation tasks have been conducted to evaluate the possibilities of using hot air, provided by the SAH, while operating under summer conditions within a closed loop, to feed an air-to-water heat exchanger for domestic hot water (DHW) production. The system is studied through simulation under two different configurations for a case study in Valladolid (Spain), during the period from May to September for different airflows in the closed loop. Results show that daily savings can vary from 27% to 85% among the different operating conditions; a configuration where make-up water is fed to the heat exchanger being preferable, with a dedicated water tank for the solar heated water storage of the minimum possible volume. The more favourable results for the harshest months highlight the interest of extending the use of the solar air heaters to the summer period. View Full-Text
Keywords: solar air heaters; experimental characterisation; summer application; simulation; domestic hot water; energy savings solar air heaters; experimental characterisation; summer application; simulation; domestic hot water; energy savings

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material


Share & Cite This Article

MDPI and ACS Style

González-González, S.L.; Tejero-González, A.; Rey-Martínez, F.J.; Andrés-Chicote, M. Alternative for Summer Use of Solar Air Heaters in Existing Buildings. Energies 2017, 10, 985.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top