Optimum operation of open-loop ground heat exchanger considering subsurface temperature gradient

2015 ◽  
Vol 40 (5) ◽  
pp. 651-661 ◽  
Author(s):  
Hyun-Jun Choi ◽  
Sangwoo Park ◽  
Hyungi Lee ◽  
Khanh Linh Nguyen Pham ◽  
Hyungkyou Ryu ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Temperature Gradient ◽  
Open Loop ◽  
Ground Heat Exchanger ◽  
Subsurface Temperature ◽  
Optimum Operation

Energy demand reduction in the built environment using shallow geothermal integrated energy systems – A comprehensive review: Part I. Design consideration of ground heat exchanger

2021 ◽  
pp. 1-62
Author(s):  
Balaji Kumar
Keyword(s):  
Heat Exchanger ◽  
Built Environment ◽  
Energy Demand ◽  
Numerical Models ◽  
Thermal Response ◽  
Open Loop ◽  
Climatic Conditions ◽  
Heat Transfer Fluid ◽  
Ground Heat Exchanger ◽  
Comprehensive Review

Abstract The research collection aims at finding the various possible opportunities for the effective integration of shallow geothermal energy (SGE) to decrease the energy demand in the built environment and to reduce emission associated with it. The integration of SGE with heat pump using pipe network is extensively reviewed. The open loop and closed loop (vertical, horizontal, energy piles) pipe networks are the most common type of ground heat exchanging methods. The objective of the review is to improve the heat exchanger effectiveness through various design aspects according to the local climatic conditions. This comprehensive review part II contains the research details pertaining to the last two decades about ground heat exchangers (geometrical aspects, borehole material, grout material, thermal response test, analytical and numerical models). Also, the factors influencing the ground heat exchanger's performance such as heat transfer fluid, groundwater flow, and soil properties are discussed in detail. This paper highlights the recent research findings and a potential gap in the ground heat exchanger.

scholarly journals A Study on Effective Energy Use of the Open Type Ground Heat Exchanger Using Underground Temperature Gradient

2014 ◽  
Vol 26 (9) ◽  
pp. 401-408 ◽  
Author(s):  
Hyungkyou Ryu ◽  
Minho Chung ◽  
Byungseok Lee ◽  
Hyojun Rhew ◽  
Hyunjun Choi ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Temperature Gradient ◽  
Energy Use ◽  
Ground Heat Exchanger ◽  
Effective Energy ◽  
Open Type

scholarly journals Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1893
Author(s):  
Kwonye Kim ◽  
Jaemin Kim ◽  
Yujin Nam ◽  
Euyjoon Lee ◽  
Eunchul Kang ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Pump System ◽  
Heat Pump System ◽  
Scale Experiment ◽  
Real Scale

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

Parametric analysis, response surface, sensitivity analysis, and optimization of a novel spiral-double ground heat exchanger

2021 ◽  
Vol 240 ◽  
pp. 114251
Author(s):  
Ahmed A. Serageldin ◽  
Ali Radwan ◽  
Takao Katsura ◽  
Yoshitaka Sakata ◽  
Shigeyuki Nagasaka ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Heat Exchanger ◽  
Response Surface ◽  
Parametric Analysis ◽  
Ground Heat Exchanger ◽  
Surface Sensitivity
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