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Research Papers: Gas Turbines: Cycle Innovations

Design, Modeling, and Performance Optimization of a Reversible Heat Pump/Organic Rankine Cycle System for Domestic Application

[+] Author and Article Information
Sylvain Quoilin

Mem. ASME
Energy Systems Research Unit,
University of Liège,
Chemin des chevreuils 7,
Liège 4000, Belgium
e-mail: squoilin@ulg.ac.be

Olivier Dumont

Energy Systems Research Unit,
University of Liège,
Chemin des chevreuils 7,
Liège 4000, Belgium
e-mail: olivier.dumont@ulg.ac.be

Kristian Harley Hansen

Innogie ApS, Birk Centerpark 40,
Herning 7400, Denmark
e-mail: khh@innogie.dk

Vincent Lemort

Energy Systems Research Unit,
University of Liège,
Chemin des chevreuils 7,
Liège 4000, Belgium
e-mail: vincent.lemort@ulg.ac.be

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 16, 2014; final manuscript received July 2, 2015; published online August 12, 2015. Assoc. Editor: Piero Colonna.

J. Eng. Gas Turbines Power 138(1), 011701 (Aug 12, 2015) (10 pages) Paper No: GTP-14-1201; doi: 10.1115/1.4031004 History: Received April 16, 2014

In this paper, an innovative system combining a heat pump (HP) and an organic Rankine cycle (ORC) process is proposed. This system is integrated with a solar roof, which is used as a thermal source to provide heat in winter months (HP mode) and electricity in summer months (ORC mode) when an excess irradiation is available on the solar roof. The main advantage of the proposed unit is its similarity with a traditional HP: the HP/ORC unit only requires the addition of a pump and four-way valves compared to a simple HP, which can be achieved at a low cost. A methodology for the optimal sizing and design of the system is proposed, based on the optimization of both continuous parameters such as heat exchanger size or discrete variables such as working fluid. The methodology is based on yearly simulations, aimed at optimizing the system performance (the net yearly power generation) over its whole operating range instead of just nominal sizing operating conditions. The simulations allow evaluating the amount of thermal energy and electricity generated throughout the year, yielding a net electric power output of 3496 kWh throughout the year.

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References

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Figures

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Fig. 1

Illustration of the concept: the reversible HP/ORC module is inserted in a building between a solar roof and a geothermal heat exchanger

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Fig. 2

Schematic view of the proposed HP/ORC module

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Fig. 3

Integration of the HP–ORC into the overall system (NB: for the sake of clarity, only the condenser and the evaporator of the HP–ORC unit are shown)

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Fig. 4

Thermal power in the ORC mode as a function of the average collector temperature

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Fig. 5

Net output power in the ORC mode as a function of the average collector temperature

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Fig. 6

Evaporator thermal power in the HP mode as a function of the average collector temperature

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Fig. 7

Consumed electrical power in the HP mode as a function of the average collector temperature

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Fig. 8

Cumulated frequency curve of the incident irradiation, net power output, and thermal power output by direct heating for the month of February

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Fig. 9

Cumulated frequency curve of the incident irradiation, net power output, and thermal power output by direct heating for the month of June

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Fig. 10

Cumulated frequency curve of the incident irradiation and thermal power output by direct heating and HP for the month of December

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