Research Papers

Performance Investigation of the Hybrid-Renewable Energy System With Geothermal and Solar Heat Sources for a Residential Building in South Korea

[+] Author and Article Information
Young-Do Jo

Exploration Geophysics and Mining Engineering Department,
Korea Institute of Geoscience and Mineral Resources,
Daejeon 305-350, Korea

In-Ju Hwang

Environmental Engineering Research Division,
Korea Institute of Construction Technology,
Goyang 411-712, Korea
e-mail: ijhwang@kict.re.kr

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received December 29, 2010; final manuscript received June 12, 2012; published online November 28, 2012. Assoc. Editor: Gregor P. Henze.

J. Sol. Energy Eng 135(2), 021005 (Nov 28, 2012) (6 pages) Paper No: SOL-10-1200; doi: 10.1115/1.4007844 History: Received December 29, 2010; Revised June 12, 2012

This study investigates annual performance of the hybrid energy system with geothermal and solar heat sources for hot water, heating and cooling of a residential house in South Korea. A small-scale hybrid-renewable energy system (H-RES) consists of a geothermal heat pump for heating and cooling, solar collectors for hot water, a gas fired backup boiler, and incidental facilities. All pipelines are designed for heat flow between the modules such as storage tank, heat production units, and radiators. Also, all systems automatically operated by the integrated sensing and control system. The average coefficient of performance of geothermal module during cooling and heating seasons is evaluated as about 4.1 and 3.5, respectively. Solar fraction for hot water is calculated as over 54%. And annual energy consumption of the H-RES is estimated as much as about 40% of conventional energy systems.

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Fig. 1

Schematic diagram of an experimental set-up

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Fig. 2

Variation of storage water temperature and collector efficiency of the solar system

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Fig. 3

Variation of daily average ground heat exchanger surface temperature and Tavg versus ln(t); (a) surface temperature of the ground heat exchanger; (b) Tavg versus ln(t)

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Fig. 4

Variation of heat rejection rate, water temperature, cooling COP, and power consumption of the H-RES; (a) heat rejection rate and water temperature of ground heat exchanger; (b) cooling COP and power consumption

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Fig. 5

Variation of heat extraction rate, water temperature, heating COP, and power consumption of the H-RES; (a) heat extraction rate and water temperature of ground heat exchanger; (b) heating COP and power consumption

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Fig. 6

Effect of climatic and operating conditions on energy fraction of the H-RES; (a) solar fraction in hot water supply; (b) annual energy fraction

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Fig. 7

Seasonal energy consumption of the H-RES; (a) cooling season; (b) midterm; (c) heating season




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