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Research Papers: Energy Systems Analysis

Thermodynamic Analysis of a Novel Space Heating System Featuring Hot Gas Water Technology

[+] Author and Article Information
Robbe Reykers

Thermal and Electrical Systems Research Laboratory (THELES),
Cluster of Engineering Technology,
Mechanical Engineering Department,
KU Leuven,
Sint-Katelijne-Waver 2860, Belgium
e-mail: reykersrobbe@gmail.com

Raf Keersmaekers

Thermal and Electrical Systems Research Laboratory (THELES),
Cluster of Engineering Technology,
Mechanical Engineering Department,
KU Leuven,
Sint-Katelijne-Waver 2860, Belgium
e-mail: Raf.keersmaekers@gmail.com

Nesrin Ozalp

Fellow ASME
Thermal and Electrical Systems Research Laboratory (THELES),
Cluster of Engineering Technology,
Mechanical Engineering Department,
KU Leuven,
Sint-Katelijne-Waver 2860, Belgium
e-mail: Nesrin.ozalp@kuleuven.be

Johan Collaert

GeoTherma,
Ambachtenstraat 14A,
Lubbeek 3210, Belgium
e-mail: j.collaert@geotherma.be

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 1, 2015; final manuscript received February 10, 2016; published online March 14, 2016. Assoc. Editor: S. O. Bade Shrestha.

J. Energy Resour. Technol 138(3), 032005 (Mar 14, 2016) (11 pages) Paper No: JERT-15-1420; doi: 10.1115/1.4032770 History: Received November 01, 2015; Revised February 10, 2016

Low operating cost, comfort, sustainability, and environmental footprint are the key elements of robust space heating (SH) system. In quest for higher efficiencies, it is not always possible to meet all of these demands where environmental footprint often gets secondary attention. This paper presents a novel SH system which is capable of meeting all of the aforementioned elements while simultaneously proving SH and domestic hot water (DHW). The system comprises a geothermal sourced heat pump (HP) featuring “hot gas water” (HGW) technology which delivers higher efficiency. This paper gives a thorough thermodynamic assessment of the system covering component based first and second law analysis and provides test results based on two case studies at a house (W10/W35) and a renovated building (W10/W45). The results show that a theoretical efficiency gain by 11.02% is achievable where the source temperature is 10 °C and the water temperature for floor heating is 35 °C. For the same system, with the same source temperature but with a supply temperature of 45 °C for SH, an efficiency gain of 17.91% is achievable. From experimental testing of the system using the test stand at GeoTherma, 4.73% efficiency gain with water temperature of 35 °C and 3.59% efficiency gain with water temperature of 45 °C were obtained. Economic analysis results showed that savings of up to 10% on an annual basis is possible with HGW technology installed in an average family house, whereas it gets 4.36% for a small hotel with a payback time period of about 9 yrs.

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References

Figures

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Fig. 1

Schematic of the simplified log P–h diagram of the HP cycle with HGW technology

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Fig. 2

Schematic of the HP system with HGW technology

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Fig. 3

Step-by-step calculation flow of the first and second law analysis

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Fig. 4

Heat capacity and distribution of the desuperheater and condenser

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Fig. 5

Principle scheme of the test setup consists of an HP system with HGW technology

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