Technical Brief

Performance of Flat-Plate and Compound Parabolic Concentrating Solar Collectors in Underfloor Heating Systems

[+] Author and Article Information
Sarvenaz Sobhansarbandi

Department of Mechanical Engineering,
Eastern Mediterranean University,
Gazimagusa North Cyprus via Mersin 10, Turkey
e-mail: sobhan.sarvenaz@gmail.com

Uğur Atikol

Department of Mechanical Engineering,
Eastern Mediterranean University,
Gazimagusa North Cyprus via Mersin 10, Turkey
e-mail: ugur.atikol@emu.edu.tr

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received May 14, 2014; final manuscript received November 17, 2014; published online December 23, 2014. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 137(3), 034501 (Jun 01, 2015) (5 pages) Paper No: SOL-14-1142; doi: 10.1115/1.4029229 History: Received May 14, 2014; Revised November 17, 2014; Online December 23, 2014

There is a growing interest in using solar energy in underfloor heating systems. However, the large areas required for the installation of solar thermal collector's array can be discouraging, especially in the apartment buildings where the apartment's roof is a common area. The objective of this study is to investigate the possibility of using compound parabolic concentrating (CPC) solar collectors instead of the commonly used flat-plate collectors (FPCs) in such systems. It is aimed to explore the feasibility of area reduction required by the collectors. Second, the temperature profiles of circulating water loop and the concrete slabs are sought to be examined. The system consists of solar thermal collectors, a storage tank, and circulation of water to transport the heat to four similar floor slabs. The CPC collector outlet fluid's temperature can reach a maximum of 95 °C, compared to 70 °C obtained from the FPCs. The results from the simulations show that a 2 m2 CPC collector array can perform satisfactorily to match the job of an 8 m2 FPC array, obtaining the same required circulating water's temperature in the slabs.

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Fig. 1

A house using solar collectors for underfloor heating, Nicosia, North Cyprus

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Fig. 2

Schematic diagram of the system

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Fig. 3

trnsys modeling scheme of the system using FPCs or CPC collectors

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Fig. 4

The hourly variation of total radiation on horizontal and tilted surface

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Fig. 5

The hourly variation of TBottom, TOColl, TSlab, and TTOP-FPC—Jan. 13

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Fig. 6

The hourly variation of TBottom, TOColl, TSlab, and TTOP-CPC collector—Jan. 13

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Fig. 7

The hourly variations of inlet and outlet water flow's temperature into the slabs—Jan. 13



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