A new performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration

Go, Gyu-Hyun; Lee, Seung-Rae; Nikhil, N; Yoon, Seok

doi:10.1016/j.energy.2015.02.086

Cited by 38 publications

(14 citation statements)

References 30 publications

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“…The factors that affect the important thermal conductivity coefficient of the ground were analysed by Song et al [21] and by Banks [22]. The effect of rainfall on the ground heat parameters and on the HGHE power was in the focus of Go et al [23].…”

Section: Measurement Methodsmentioning

confidence: 99%

Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

2016

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Abstract:The objective of this work was to monitor and analyse temperature changes in the ground with installed linear and Slinky-type horizontal ground heat exchangers (HGHEs), used as low-potential heat pump energy sources. Specific heat flows and specific energies extracted from the ground during the heating season were also measured and compared. The verification results showed that the average daily ground temperatures with the two HGHEs are primarily affected by the temperature of the ambient environment. The ground temperatures were higher than ambient temperature during most of the heating season, were only seldom below zero, and were higher by an average 1.97˘0.77 K in the ground with the linear HGHE than in the ground with the Slinky-type HGHE. Additionally, the specific thermal output extracted from the ground by the HGHE was higher by 8.45˘16.57 W/m 2 with the linear system than with the Slinky system. The specific energies extracted from the ground over the whole heating season were 110.15 kWh/m 2 and 57.85 kWh/m 2 for the linear and Slinky-type HGHEs, respectively.

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Section: Measurement Methodsmentioning

confidence: 99%

Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

2016

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“…However, further analysis on heat and moisture transfers at shallow depths and their effect on the performance of GSHPs are not discussed in this paper, due to the absence of the performance data of heat pumps and soil moisture, i.e., soil hydraulic parameters, volumetric water content, degree of saturation, and pore-water pressure. It has been remarked in previous studies that soil thermal conductivity is strongly related to soil water saturation [62,[66][67][68][69]. Go et al evaluated the effects of rainfall infiltration on the performance of GSHP, with shallow horizontal heat exchangers via numerical analysis [69].…”

Section: Ground Temperature Datamentioning

confidence: 99%

Ground-Source Heat Pumps with Horizontal Heat Exchangers for Space Cooling in the Hot Tropical Climate of Thailand

et al. 2019

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The cooling of spaces in tropical regions, such as Southeast Asia, consumes a lot of energy. Additionally, rapid population and economic growth are resulting in an increasing demand for space cooling. The ground-source heat pump has been proven a reliable, cost-effective, safe, and environmentally-friendly alternative for cooling and heating spaces in various countries. In tropical countries, the presumption that the ground-source heat pump may not provide better thermal performance than the normal air-source heat pump arises because the difference between ground and atmospheric temperatures is essentially low. This paper reports the potential use of a ground-source heat pump with horizontal heat exchangers in a tropical country—Thailand. Daily operational data of two ground-source heat pumps and an air-source heat pump during a two-month operation are analyzed and compared. Life cycle cost analysis and CO2 emission estimation are adopted to evaluate the economic value of ground-source heat pump investment and potential CO2 reduction through the use of ground-source heat pumps, in comparison with the case for air-source heat pumps. It was found that the ground-source heat pumps consume 17.1% and 18.4% less electricity than the air-source heat pump during this period. Local production of heat pumps and heat exchangers, as well as rapid regional economic growth, can be positive factors for future ground-source heat pump application, not only in Thailand but also southeast Asian countries.

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“…Esen et al [7] investigated the energetic and exergetic efficiencies of a GCHP system with two horizontal GHEs. Go et al [8] investigated how rainfall infiltration affected the performance of horizontal GHEs, and found out that rainfall infiltration led to a widening fluid temperature gap between the inlet and outlet, and achieved a higher thermal efficiency than that of no rainfall. Recently, vertical GHEs are usually preferred to horizontal ones in the majority of buildings, since vertical GHEs occupy less ground area than the horizontal ones.…”

Section: Introductionmentioning

confidence: 98%

Accurately predicting heat transfer performance of ground heat exchanger for ground-coupled heat pump systems using data mining methods

Zhuang

Ben

Yan

et al. 2016

Neural Comput & Applic

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Nowadays, the ground-coupled heat pump (GCHP) systems have been recognized as one of the most energy-efficient systems for heating, cooling and hot water supply in both residential and commercial buildings. However, the heat transfer of ground heat exchanger (GHE) involves in large spatial scales, long time span and complex influential factors. We develop a data mining framework constructed by using 1998 experimental data to study the effects of 12 input variables composed of seven borehole parameters, two U-tube parameters, two ground parameters and one circulating liquid parameter to accurately predict the heat transfer performance of GHE for GCHP systems in 10 years. Hence, selecting a suitable input configuration to improve the energy efficiency has important sustainability benefits. The role of each of independent variable explaining the output variables is analyzed by partial least squares regression. Furthermore, support vector regression and M5 Model Tree are, respectively, used to predict the heat transfer performance. Extensive simulations show that we can predict the average quantity of heat exchanger, temperature of ground around GHE, inlet temperature of heat pump unit with very low level of error.

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A new performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration

Cited by 38 publications

References 30 publications

Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

Ground-Source Heat Pumps with Horizontal Heat Exchangers for Space Cooling in the Hot Tropical Climate of Thailand

Accurately predicting heat transfer performance of ground heat exchanger for ground-coupled heat pump systems using data mining methods

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