Numerical assessment on the thermal imbalance of multiple ground heat exchangers connected in parallel

Chen, Fei; Mao, Jinfeng; Zhu, Guodong; Zhang, Bing; Tian, Ye; Liao, Dan; Liu, Ying

doi:10.1016/j.geothermics.2021.102191

Cited by 10 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Huang et al 24 developed a deep coaxial BHE for building heating with a depth of 2044 m. It was shown that the thermal development between the soil and fluid was improved around the borehole. Chen et al 25 established a numerical approach of the heat pump and the water collector/separator for the thermal imbalance assessment of multiple ground heat exchangers joined in parallel. Tang and Nowamooz 26 numerically investigated the typical 15 factors affecting the heat pump performance driven by ground source energy.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of different types of ground source heat exchangers in a hot and dry climate

2022

View full text Add to dashboard Cite

Most of the energy consumption in a hot and dry area is used for the air-conditioning systems. This study aims to investigate the possibility of reducing the electricity consumption in air conditioners using ground cold energy to cool the hot fluid in the pipes.Several experiments were carried out to investigate the performance of the proposed system to be used in the weather conditions of Baghdad city (i.e., hot and dry).Two configurations of ground source heat exchangers (GSHEs) were developed and constructed. The first configuration comprised coil type with two different materials (copper and polyvinyl chloride [PVC]). The second configuration was the 3U type, which was made from copper, PVC, and galvanized. Three water flow rates were considered (5, 10, and 15 L/min) with water inlet temperatures (80°C, 70°C, and 60°C). The experiments' results showed that the type of material of the pipe has a significant influence on both the heat transfer effectiveness and the system performance.Copper tubes were the best type of heat exchanger (type coil) to be used in this regard. The highest recorded values of the heat exchange rate were 5.81, 4.81, 2.72, 1.60, and 1.32 kW with an inlet temperature of 80°C and a flow rate of 5 L/min for the case of

show abstract

Section: Introductionmentioning

confidence: 99%

Performance evaluation of different types of ground source heat exchangers in a hot and dry climate

2022

View full text Add to dashboard Cite

show abstract

“…Buildings with lower compactness ratios are narrower and have larger perimeter areas. The compactness ratio of a building affects its heat balance, which is of great importance to the design of ground-coupled systems as their design is sensitive to both intense peaks , Pahud et al, 2012 and imbalanced annual energy (You et al, 2016, Chen et al, 2021, Bae and Nam, 2022.…”

Section: Building Selectionmentioning

confidence: 99%

Combining Direct Ground Cooling with Ground-Source Heat Pumps and District Heating: Borehole Sizing and Land Area Requirements

Arghand,

Javed,

Dalenbäck

2022

SSRN Journal

View full text Add to dashboard Cite

“…Te heat pump outlet temperature is equal to the BHE-carrying fuid inlet temperature and is distributed to all boreholes at nearly the same temperature. Teir outlet temperatures are diferent due to ground temperature variation surrounding the BHEs, leading to the diference in the heat exchange rate for each borehole [28,29]. In practice, the heating/cooling load of the BHE array can be controlled, indicating the variation of carrying fuid inlet temperature with the operation time.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Investigation of a Borehole Heat Exchanger (BHE) Array with the Influence of Same Inlet Temperature (SIT) and Same Heat Load (SHL) Boundaries

Zhang

Yang

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

Borehole heat exchanger (BHE) array is a key element in the ground source heat pump system (GSHPS). The BHE array is traditionally simplified by assuming the same heat exchange rate for each BHE, which normally is not correspondent to the real applications. In this investigation, a TRT was firstly conducted for a site located in Shanxi Province (China) to get the local ground thermal properties. A numerical simulation framework was next verified by the TRT results. Subsequently, the ground thermal properties obtained by the TRT were used in the numerical simulation model to investigate the influence of two operation strategies on the ground temperature development of the surrounding soil and the BHE performance. The results showed that both ground temperature and BHE array performance decreased during the 8-year operation period of the BHE array in the heating mode. The ground temperature around the center BHE was lower in the same heat load (SHL) scenario (same heat load for the BHEs in the array) than in the same inlet temperature (SIT) scenario (same carrying fluid inlet temperature for the BHEs in the array), and this difference can be 2 °C in the 7th year. The annual average outlet temperature in the SHL scenario was also lower than that in the SIT scenario, especially in the long term. The investigation shows that SIT working strategy superiors the SHL strategy, providing a reference for the upcoming investigation on the design aspect of the GSHPS.

show abstract

Numerical assessment on the thermal imbalance of multiple ground heat exchangers connected in parallel

Cited by 10 publications

References 29 publications

Performance evaluation of different types of ground source heat exchangers in a hot and dry climate

Performance evaluation of different types of ground source heat exchangers in a hot and dry climate

Combining Direct Ground Cooling with Ground-Source Heat Pumps and District Heating: Borehole Sizing and Land Area Requirements

Long-Term Investigation of a Borehole Heat Exchanger (BHE) Array with the Influence of Same Inlet Temperature (SIT) and Same Heat Load (SHL) Boundaries

Contact Info

Product

Resources

About