PERFORMANCE MONITORING STUDY OF BUILDING-INTEGRATED GEOTHERMAL SYSTEM IN WINTER AND SUMMER

2013 ◽  
Vol 21 (02) ◽  
pp. 1350015 ◽  
Author(s):  
HYUNG-KYOU RYU
Keyword(s):  
Heat Exchanger ◽  
Performance Monitoring ◽  
Winter Season ◽  
Geothermal System ◽  
Ground Heat Exchanger ◽  
Test Bed ◽  
Cooling Performance ◽  
Heating And Cooling ◽  
Monitoring Study ◽  
Grouting Materials

The objective of this study is to develop and evaluate ground heat exchanger using the foundation of a building. To this end, we added ground heat exchanger feature to PHC piles and evaluated its heating and cooling performance. First, we investigated the building's foundation system, pipes for heat exchanger and grouting materials. As an outcome, we designed a prototype of building-integrated geothermal system (BIGS). Second, we applied BIGS to apartment houses utility building in Osan S-apartment and G-housing in Song-Do that is 80% energy saving test bed. Third, for the performance of BIGS, we monitored heating performance during winter season in the Osan facility and cooling performance during summer season in the Song-Do facility.

Experimental Study of Heating-Cooling Combined Ground Source Heat Pump System with Horizontal Ground Heat Exchanger

2011 ◽  
Vol 374-377 ◽  
pp. 398-404 ◽  
Author(s):  
Ying Ning Hu ◽  
Ban Jun Peng ◽  
Shan Shan Hu ◽  
Jun Lin
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
Pipe Length ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling

A hot-water and air-conditioning (HWAC) combined ground sourse heat pump(GSHP) system with horizontal ground heat exchanger self-designed and actualized was presented in this paper. The heat transfer performance for the heat exchanger of two different pipe arrangements, three layers and four layers, respectively, was compared. It showed that the heat exchange quantity per pipe length for the pipe arrangement of three layers and four layers are 18.0 W/m and 15.0 W/m. The coefficient of performance (COP) of unit and system could remain 4.8 and 4.2 as GSHP system for heating water, and the COP of heating and cooling combination are up to 8.5 and 7.5, respectively. The power consumption of hot-water in a whole year is 9.0 kwh/t. The economy and feasibility analysis on vertical and horizontal ground heat exchanger were made, which showed that the investment cost per heat exchange quantity of horizontal ground heat exchanger is 51.4% lower than that of the vertical ground heat exchanger, but the occupied area of the former is 7 times larger than the latter's.

scholarly journals A Study on Improving the Coefficient of Performance by Comparing Balancing Well and Standing Column Well Heat Exchange Systems

2020 ◽  
Vol 12 (24) ◽  
pp. 10445
Author(s):  
Myungkwan Lim ◽  
Kyoungbin Lim ◽  
Changhee Lee
Keyword(s):  
Thermal Conductivity ◽  
Heat Exchanger ◽  
Effective Thermal Conductivity ◽  
Water Discharge ◽  
Underground Water ◽  
Coefficient Of Performance ◽  
Geothermal System ◽  
Heat Accumulation ◽  
Heating And Cooling ◽  
Discharge Water

This study proposed a technology to improve the performance characteristics and coefficient of performance (COP) of a geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger composed of bleed discharge water that utilizes two balancing wells using cross-mixing methods. Using the standing column well (SCW) and cross-mixing balancing well underground heat exchanger, we compared and analyzed the effective thermal conductivity characteristics and COP characteristics during heating and cooling modes. Consequently, the cross-mixing balancing well underground heat exchanger exhibited more effective thermal conductivity than the SCW underground heat exchanger, with a high COP. Therefore, suggesting the performance was improved using groundwater flow rather than SCW. The comparison and analysis results of the effective heat map characteristics using the results of the SCW and balancing well system showed that the heating operation for the SCW underground heat exchanger had better thermal conductivity characteristics than the cooling operation. In addition, regarding a balancing well underground heat exchanger, the cooling operation exhibited superior thermal conductivity characteristics. Thus, the performance was considered to have improved due to the flow of activated groundwater in the ground and the rapid heat transfer without heat accumulation.

scholarly journals Performance Analysis of Air Cooled Heat Pump Coupled with Horizontal Air Ground Heat Exchanger in the Mediterranean Climate

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2704 ◽  
Author(s):  
Cristina Baglivo ◽  
Sara Bonuso ◽  
Paolo Congedo
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Thermal Inertia ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
External Temperature ◽  
Heating And Cooling ◽  
Air Temperatures ◽  
High Thermal Inertia ◽  
Transient System

A concept of Air-Cooled Heat Pump (ACHP) coupled with a Horizontal Air-Ground Heat Exchanger (HAGHE), also called Horizontal Earth-To-Air Heat Exchanger (EAHX), has been proposed. The Air-Cooled Heat Pump is a system which transfers heat from outside source (air) to inside sink (water) and vice versa in summertime. The innovation is to provide a geothermal treatment of pre-heating/cooling of air before meeting the evaporator in winter or the condenser in summer of the heat pump. Besides, it is known that the variations of the ground temperature, respect to the external air one, are mitigated already in the first layers of the ground throughout the year, due to the high thermal inertia of the ground, letting the heat pump work with more mitigated conditions, improving the performances. The behaviour of HAGHE has been investigated by varying the length and the installation depth of the probes, the air flow rate and the ground thermal properties. All the combinations have been implemented using TRNSYS 17 software (Transient System Simulation Program) to obtain the outlet temperatures from HAGHE, resulting from the 54 configurations. The results are compared in terms of Coefficient of Performance (COP) in wintertime and Energy Efficiency Ratio (EER) in summertime between configurations with and without the coupling with HAGHE. In addition, two seasonal performance SCOP and SEER coefficients have been calculated considering, not only the inlet air temperatures into the Air-Cooled Heat Pump, but also their frequency of occurrence, the off-set external temperature (16 °C), the nominal external temperature and heating and cooling loads.

Achievement of Geothermal Energy Using Ground Heat Exchanger in Ma'En

2011 ◽  
Vol 22 (8) ◽  
pp. 1029-1050 ◽  
Author(s):  
Mohammed Awwad Ali Al-Dabbas
Keyword(s):  
Heat Exchanger ◽  
Geothermal Energy ◽  
Design Procedure ◽  
Ground Heat Exchanger ◽  
Cooling Mode ◽  
Geothermal Fluid ◽  
Heating And Cooling ◽  
Low Emission ◽  
Fluent Software ◽  
Heating Mode

Geothermal energy in Jordan is a low-emission and renewable source that could provide households and commercial buildings with both heating and cooling. Access to this ‘free’ energy may be available just a few feet underground. Thus, the objectives of this research are: Designing ground heat exchanger to utilize geothermal energy in heating in which the primary geothermal fluid is exchanged with secondary clean fluid The feasibility of designing ground heat exchanger system to pumping geothermal energy under the climate of Jordan weather in Ma'en area Amount of energy saved The design procedure involves applying the energy and the momentum equations around the geothermal fluid circuit. The FLUENT software program is used to calculate the ground heat exchanger parameters and the amount of energy saved. Finally, the feasibility study shows that the Geoexchange systems represent a savings to homeowners of around 70% in the heating mode, and up to 50% in the cooling mode compared with conventional fossil fuel systems.

Analysis and Research on the Performance of the Ground Source Heat Pump System in Different Areas of China

2011 ◽  
Vol 148-149 ◽  
pp. 1137-1140 ◽  
Author(s):  
Zi Shu Qi ◽  
Qing Gao ◽  
Yan Liu ◽  
Y.Y. Yan ◽  
Jeffrey D. Spitler
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Fluid Temperature ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Time Step ◽  
Heating And Cooling ◽  
Ground Source ◽  
Vertical Ground ◽  
Cooling Loads

In the paper, it is to describe the performance of the vertical ground heat exchangers (GHE) in different areas of China. The energy consumption of ground source heat pump (GSHP) system is based on the instantaneous fluid temperature at the heat pump inlet. This temperature defines the GSHP coefficient of performance and hence the electricity consumption required in order to fulfill the energy demands of the building. A mathematical model for simulation of vertical ground heat exchanger system is built based on long time-step theory. The design methodology is based on a simulation that predicts the temperature response of the ground heat exchanger to hourly heating and cooling loads demand in 20 years. This paper presents GSHP system can achieve energy performance in buildings that heating and cooling loads all the year round in different areas.

Comparison of Borehole Thermal Resistance Values of Ground Heat Exchanger Obtained by Several Methods

2013 ◽  
Vol 732-733 ◽  
pp. 103-108 ◽  
Author(s):  
Han Byul Kang ◽  
Seok Yoon ◽  
Gyu Hyun Go ◽  
Seung Rae Lee
Keyword(s):  
Heat Exchanger ◽  
Thermal Resistance ◽  
Heat Pump ◽  
Heating System ◽  
Geothermal System ◽  
Ground Heat Exchanger ◽  
Ubiquitous System ◽  
Borehole Thermal Resistance ◽  
Quantity Of Heat ◽  
Emission Of Greenhouse Gases

The Ground-Coupled or Source Heat Pump (GCHP/GSHP) system is increasingly being considered as an alternative to traditional cooling/heating system because it can reduce the emission of greenhouse gases. The GCHP/GSHP system uses sustainable ground temperature to emit heat during the summer and to extract heat during the winter. It is a ubiquitous system because it can be used at any time or place and semi-permanent energy. The geothermal system is composed of Ground Heat Exchanger (GHE), heat pump and load facilities. The GHE is embedded in a borehole, which is made up of GHE and grout. The borehole thermal resistance is the most important parameter in designing the geothermal system because it shows the quantity of heat transfer in the borehole. There are many methods to estimate the borehole thermal resistance. Thermal Performance Tests (TPTs) were conducted to directly measure the borehole thermal resistance of several kinds of GHEs. Then the experiment results and analytical results were compared in order to select the most accurate methods to evaluate the borehole thermal resistance.

Design and Development of an Additively Manufactured Geothermal Heat Exchanger for Improved Efficiency and Easy Installation

2020 ◽  
Author(s):  
Takele Gemeda ◽  
Sandy Estrada ◽  
Wondwosen Demisse ◽  
Lei Wang ◽  
Jiajun Xu
Keyword(s):  
Additive Manufacturing ◽  
Heat Exchanger ◽  
Constant Temperature ◽  
Energy Systems ◽  
The United States ◽  
Geothermal System ◽  
Geothermal Systems ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
System Energy

Abstract Effective system energy management and cooling is critical for a range of increasingly complex systems and missions. Various industries and agencies seek technologies to use energy more efficiently in various applications, and thereby increase system energy efficiencies in future advanced energy systems. There has been an increasing interest in exploiting the use of additive manufacturing in developing nontraditional energy conversion schemes. Meanwhile, wind power and solar power systems have become part of common knowledge and conversation over the past few years. While these provide excellent sustainable options of energy production, geothermal energy systems are just as efficient and economical. Solar and wind energy collectors are also site specific. On the other hand, the geothermal systems do not take up buildable ground level space nor are they location or climate specific. The earth has a generally constant temperature throughout the year which can be used in geothermal systems to benefit all sites. If all geothermal resources were combined, enough energy would be produced to provide all of the electricity needs in the United States. However, conventional geothermal system requires the relatively complex installation process and can potentially be cost prohibitive to many potential users. In this study, an additively manufactured heat exchanger was designed and developed to resolve that issue. The heat exchanger can be integrated with a conventional geothermal heating and cooling system for improved efficiency and easy installation. A customized geothermal heating and cooling loop was designed and developed for testing the efficiency of the heat exchanger. Within this proposed system, this additive manufactured heat exchanger is designed and fabricated to improve it efficiency and easy installation with minimal tools needed. This new design eliminates the need of excavation of the soil and installation of long tubes as conventionally required for geothermal system. This new heat exchanger was designed using CREO software and fabricated using an EOS M280 direct metal laser sintering system at University of the District of Columbia. It is then integrated with a heat pump to exchange heat between a constant temperature of water bath circulator and a water heat sink. A prototype system was designed and constructed, which allowed the direct assessment of its performance. The performance of the heat exchanger is studied using COMSOL software to assess its heat transfer performance. The results have shown a significant improvement in its efficiency. It has shown the promising application of metal additive manufacturing technique in improving the efficiency of existing energy harvesting applications.

CFD Based Study on an Earth Pipe Heat Exchanger With Different Pipe Geometries

2016 ◽  
Author(s):  
Shashank Srivastava ◽  
Aashish Sharma ◽  
Ketan Ajay
Keyword(s):  
Heat Exchanger ◽  
Energy Sources ◽  
Ground Heat Exchanger ◽  
Cfd Modelling ◽  
Tube Heat Exchanger ◽  
Heating And Cooling ◽  
Effective Performance ◽  
Extended Surface ◽  
Day To Day Operations ◽  
Pipe Heat

Heating and cooling is a prime need for various day to day operations and one of the most basic requirements is space conditioning. A huge amount of energy all across the globe is being used for this purpose using various conventional & non-conventional energy based resources. But environmental problems, fast depletion nature and high prices associated with the use of conventional energy sources is becoming a big problem, due to which promotion of non-conventional energy sources becomes important. The use of an in-ground heat exchanger is a unique technique for space conditioning with reduced energy consumption. A lot of research and studies have been done on the design of such systems. This paper presents a study based on the CFD modelling and simulation to analyze the effect on the effective performance of the system by varying the geometry of ducts and using the extended surface to increase the heat transfer rate. Also, a comparative study of performance of earth tube heat exchanger for different cross section of ducts is also presented.

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