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Research Papers: Energy Storage/Systems

Enhanced Ground Source Heat Pump System With Thermal Storage System

[+] Author and Article Information
Hirotoshi Taira

Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1-Nakagawara, Tokusada, Tamura-machi,
Koriyama, 963-8642, Japan
e-mail: taira.hirotoshi@nihon-u.ac.jp

Takashi Sato

Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1-Nakagawara, Tokusada, Tamura-machi,
Koriyama, 963-8642, Japan
e-mail: satot@mech.ce.nihon-u.ac.jp

Takao Kakizaki

Mem. ASME
Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1-Nakagawara, Tokusada, Tamura-machi,
Koriyama, 963-8642, Japan
e-mail: kakizaki.takao@nihon-u.ac.jp

Masahito Oguma

Mem. ASME
Department of Mechanical Engineering,
College of Engineering,
Nihon University,
1-Nakagawara, Tokusada, Tamura-machi,
Koriyama, 963-8642, Japan
e-mail: oguma.masahito@nihon-u.ac.jp

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 27, 2018; final manuscript received December 14, 2018; published online January 18, 2019. Assoc. Editor: Guangdong Zhu.

J. Energy Resour. Technol 141(6), 061902 (Jan 18, 2019) (10 pages) Paper No: JERT-18-1662; doi: 10.1115/1.4042403 History: Received August 27, 2018; Revised December 14, 2018

The short-cycling operation of a heat pump decreases energy consumption efficiency. Short-cycling operations of ground source heat pump system (GSHP) occur when the ON/OFF control of a heat pump is used in a partial load condition. It is considered effective that GSHP with capacity controls installs to suppress short-cycling operations. However, there is no report on any continuous operations by capacity control GSHP in actual operations. We confirmed that GSHP (water to water) with capacity control operates short-cycling in the residence. Short-cycling operations occurred with a sudden load fluctuation due to opening or closing of the valves. We conducted effective verification experiments of the thermal storage device at the artificial heat load fluctuations condition. When the thermal storage device installed upstream brine circulation line of the heat pump with the capacity control, continuous operations are performed. It was under the condition at the heating heat load of 5 kW is turned ON/OFF every 20 min. In this case, energy consumption efficiency of a heat pump is 13% higher than the efficiency without the thermal storage device.

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Augustyn, T. , 2012, “ Energy Efficiency and Savings in Pumping Systems—The Holistic Approach,” Southern African Energy Efficiency Convention, Johannesburg, South Africa, Nov. 14–15, pp. 1–7.

Figures

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Fig. 1

Five kilowatts class heat pump (water to water)

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Fig. 2

Pipe line of user's house GSHP system

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Fig. 3

Short cycling operations in user's house (Feb. 14, 2017)

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Fig. 4

Each heat output experimental device

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Fig. 5

COPHP and compressor outlet pipe surface temperature

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Fig. 6

Fluctuation heat load experimental device

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Fig. 7

Dimension and temperature measurement points of thermal storage device

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Fig. 8

Profiles of brine temperature, heat output, electric power, and COPHP in fluctuation heat load experiments: (a) No. 1 thermal storage without, (b) No. 2 upstream of GSHP, and (c) No. 3 downstream of GSHP

Tables

Errata

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