Operational behavior characteristics and energy saving potential of vertical closed loop ground source heat pump system combined with storage tank in an office building

Min Ji Kim, Byeong Mo Seo, Jong Man Lee, Jong Min Choi, Kwang Ho Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A ground source heat pump (GSHP) system utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. Among various types of GSHP systems, Vertical Closed Loop Ground Source Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, in order to improve the system performance of a VGSHP, a VGSHP system coupled with heat storage tank was evaluated. For this purpose, the detailed analysis on the operational behavior of heat storage tank and the variations of heat pump energy performance due to the connection with heat storage tank was performed, and characteristics of heat pump part load ratios (PLRs) and the corresponding energy requirements, compared to chiller and boiler based conventional system, were analyzed in detail, using dynamic energy simulation after comprehensive validation process of heat pump performance curves. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 20% for cooling and about 77% for heating compared to the conventional air conditioning system, and an energy saving effect of about 2% for cooling and about 15% for heating compared to the VGSHP system without heat storage tank, mainly due to the fact that the operational pattern of heat pump such as PLR and COP characteristics was changed by the operation of heat storage tank.

Original languageEnglish
Pages (from-to)239-252
Number of pages14
JournalEnergy and Buildings
Volume179
DOIs
Publication statusPublished - 2018 Nov 15
Externally publishedYes

Fingerprint

Geothermal heat pumps
Heat pump systems
Office buildings
Heat storage
Energy conservation
Pumps
Cooling
Heating
Air conditioning
Boilers
Energy efficiency
Hot Temperature

Keywords

  • Coefficient of Performance (COP)
  • Energyplus
  • Heat storage tank
  • Part Load Ratio (PLR)
  • Performance curve
  • Vertical Closed Loop Ground Source Heat Pump (VGSHP)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Operational behavior characteristics and energy saving potential of vertical closed loop ground source heat pump system combined with storage tank in an office building. / Kim, Min Ji; Seo, Byeong Mo; Lee, Jong Man; Choi, Jong Min; Lee, Kwang Ho.

In: Energy and Buildings, Vol. 179, 15.11.2018, p. 239-252.

Research output: Contribution to journalArticle

@article{08edb411df764a6f8e719f102d2eb698,
title = "Operational behavior characteristics and energy saving potential of vertical closed loop ground source heat pump system combined with storage tank in an office building",
abstract = "A ground source heat pump (GSHP) system utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. Among various types of GSHP systems, Vertical Closed Loop Ground Source Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, in order to improve the system performance of a VGSHP, a VGSHP system coupled with heat storage tank was evaluated. For this purpose, the detailed analysis on the operational behavior of heat storage tank and the variations of heat pump energy performance due to the connection with heat storage tank was performed, and characteristics of heat pump part load ratios (PLRs) and the corresponding energy requirements, compared to chiller and boiler based conventional system, were analyzed in detail, using dynamic energy simulation after comprehensive validation process of heat pump performance curves. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 20{\%} for cooling and about 77{\%} for heating compared to the conventional air conditioning system, and an energy saving effect of about 2{\%} for cooling and about 15{\%} for heating compared to the VGSHP system without heat storage tank, mainly due to the fact that the operational pattern of heat pump such as PLR and COP characteristics was changed by the operation of heat storage tank.",
keywords = "Coefficient of Performance (COP), Energyplus, Heat storage tank, Part Load Ratio (PLR), Performance curve, Vertical Closed Loop Ground Source Heat Pump (VGSHP)",
author = "Kim, {Min Ji} and Seo, {Byeong Mo} and Lee, {Jong Man} and Choi, {Jong Min} and Lee, {Kwang Ho}",
year = "2018",
month = "11",
day = "15",
doi = "10.1016/j.enbuild.2018.09.025",
language = "English",
volume = "179",
pages = "239--252",
journal = "Energy and Buildings",
issn = "0378-7788",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Operational behavior characteristics and energy saving potential of vertical closed loop ground source heat pump system combined with storage tank in an office building

AU - Kim, Min Ji

AU - Seo, Byeong Mo

AU - Lee, Jong Man

AU - Choi, Jong Min

AU - Lee, Kwang Ho

PY - 2018/11/15

Y1 - 2018/11/15

N2 - A ground source heat pump (GSHP) system utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. Among various types of GSHP systems, Vertical Closed Loop Ground Source Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, in order to improve the system performance of a VGSHP, a VGSHP system coupled with heat storage tank was evaluated. For this purpose, the detailed analysis on the operational behavior of heat storage tank and the variations of heat pump energy performance due to the connection with heat storage tank was performed, and characteristics of heat pump part load ratios (PLRs) and the corresponding energy requirements, compared to chiller and boiler based conventional system, were analyzed in detail, using dynamic energy simulation after comprehensive validation process of heat pump performance curves. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 20% for cooling and about 77% for heating compared to the conventional air conditioning system, and an energy saving effect of about 2% for cooling and about 15% for heating compared to the VGSHP system without heat storage tank, mainly due to the fact that the operational pattern of heat pump such as PLR and COP characteristics was changed by the operation of heat storage tank.

AB - A ground source heat pump (GSHP) system utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. Among various types of GSHP systems, Vertical Closed Loop Ground Source Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, in order to improve the system performance of a VGSHP, a VGSHP system coupled with heat storage tank was evaluated. For this purpose, the detailed analysis on the operational behavior of heat storage tank and the variations of heat pump energy performance due to the connection with heat storage tank was performed, and characteristics of heat pump part load ratios (PLRs) and the corresponding energy requirements, compared to chiller and boiler based conventional system, were analyzed in detail, using dynamic energy simulation after comprehensive validation process of heat pump performance curves. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 20% for cooling and about 77% for heating compared to the conventional air conditioning system, and an energy saving effect of about 2% for cooling and about 15% for heating compared to the VGSHP system without heat storage tank, mainly due to the fact that the operational pattern of heat pump such as PLR and COP characteristics was changed by the operation of heat storage tank.

KW - Coefficient of Performance (COP)

KW - Energyplus

KW - Heat storage tank

KW - Part Load Ratio (PLR)

KW - Performance curve

KW - Vertical Closed Loop Ground Source Heat Pump (VGSHP)

UR - http://www.scopus.com/inward/record.url?scp=85054019917&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054019917&partnerID=8YFLogxK

U2 - 10.1016/j.enbuild.2018.09.025

DO - 10.1016/j.enbuild.2018.09.025

M3 - Article

AN - SCOPUS:85054019917

VL - 179

SP - 239

EP - 252

JO - Energy and Buildings

JF - Energy and Buildings

SN - 0378-7788

ER -