scholarly journals Investigating green infrastructure as potential medium for ground heat exchangers

2020 ◽  
Vol 205 ◽  
pp. 06013
Author(s):  
Anil Yildiz ◽  
Ross A. Stirling
Keyword(s):  
Soil Temperature ◽  
Green Infrastructure ◽  
Heat Exchangers ◽  
Heat Dissipation ◽  
Power Input ◽  
Atmospheric Conditions ◽  
Heat Rejection ◽  
Capital Costs ◽  
Ground Heat Exchangers ◽  
Heating And Cooling

Space heating and cooling comprises a significant portion of the overall energy consumption. Ground heat exchangers (GHE), are a sustainable alternative to conventional, non-renewably powered heating and cooling systems. Space is a scarce resource in densely urbanised areas, allocating dedicated locations to build GHE systems can result in high initial capital costs and an inflexibility in retrofitting. An alternative solution is to utilise existing, multi-benefit and resilient Sustainable Drainage Systems (SuDS) in cities. An investigation into the feasibility of utilising SuDS as sites for potential GHEs requires an understanding of their thermal and hydrological behaviour and boundary conditions. This study utilises a heavily-instrumented, vegetated lysimeter setup, exposed to atmospheric conditions, to test a pilot-scale SuDS heat exchanger. Heat rejection into the substrate of a SuDS has been simulated with the application of heat via voltage-controlled heating cables at a depth of 850 mm for 72-hour durations (at three different power inputs) with 96-hours between each power input. These heat dissipation periods are reflected in measured soil temperature profiles. Volumetric water content, matric suction, soil temperature and heat flux are monitored at various locations in the lysimeter. A finite difference modelling scheme has been developed to simulate the variation in soil temperature due to heat rejection.

Experimental thermal performance analysis of ground heat exchangers for space heating and cooling applications

2017 ◽  
Vol 113 ◽  
pp. 1168-1181 ◽  
Author(s):  
T. Sivasakthivel ◽  
Mikael Philippe ◽  
K. Murugesan ◽  
Vikas Verma ◽  
Pingfang Hu
Keyword(s):  
Performance Analysis ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Space Heating ◽  
Ground Heat Exchangers ◽  
Heating And Cooling

Thermo-Economical Optimization of Ground Source Heat Pump With Horizontal Ground Heat Exchangers for a Heating Season in Istanbul: A Case Study

2014 ◽  
Author(s):  
Hakan Demir ◽  
Alişan Gönül ◽  
Nurullah Kayaci ◽  
Ş. Özgür Atayılmaz ◽  
Özden Ağra
Keyword(s):  
Soil Temperature ◽  
Objective Function ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Burial Depth ◽  
Ground Source Heat Pump ◽  
Economic Optimization ◽  
Ground Source Heat Pumps ◽  
Ground Heat Exchangers ◽  
Ground Source

A ground-source heat pump (GSHP) system has three major components: a heat pump, an earth connection and an interior heating or cooling distribution system. The most important part of a ground source heat pump (GSHP) is the ground heat exchanger (GHE) that consists of pipes buried in the soil and is used for transferring heat between the soil and evaporator of the ground source heat pump. There are plenty of works on ground source heat pumps and ground heat exchangers in the literature. Most of the works on ground heat exchangers are based on the heat transfer in the soil and temperature distribution around the coil. Some of the works for thermo-economic optimization of thermal systems are based on thermodynamic cycles. In this paper, it was carried out that the thermo-economic optimization of a ground source heat pump system with horizontal ground heat exchangers operating in heating mode in Istanbul in Turkey. The monthly heat loads of a villa for every heating months were worked out by using TS825® program. Also, average soil temperature has been calculated according to soil surface temperatures taken from Turkish State Meteorological Service belonging to last ten years. An objective function was defined based on heating capacity, initial investment and operating costs of ground source heat pump (GSHP). Then, the effects of the soil thermal conductivity, burial depth and variation of soil temperature on the objective function were investigated. Also, variation of COP value was carried out for burial depth and different condensation temperatures monthly.

Review of Soil Temperature Recovery Characteristics of the GSHP System

2014 ◽  
Vol 716-717 ◽  
pp. 829-831
Author(s):  
Di Di Xue ◽  
Xin Wang ◽  
Zhi Wen Cheng
Keyword(s):  
Soil Temperature ◽  
Energy Saving ◽  
Heat Exchangers ◽  
Heat Pumps ◽  
Ground Source Heat Pumps ◽  
Environment Friendly ◽  
Ground Heat Exchangers ◽  
Ground Source ◽  
Sustained Operation ◽  
Temperature Recovery

Ground-source heat pumps (GSHPs) are receiving increasing interest because of their potential to be energy-saving and environment-friendly. The recovery of the soil temperature which ambient ground heat exchangers (GHE) is closely related to the stable and sustained operation of the GSHP system, thus a lot of investigations were carried out. This paper reviews the research made by different methods about the recovery of the soil temperature in and out china.

scholarly journals Developing analysis approaches for energy walls

2020 ◽  
Vol 205 ◽  
pp. 06005
Author(s):  
Ida Shafagh ◽  
Fleur Loveridge
Keyword(s):  
Heat Exchangers ◽  
Feasibility Assessment ◽  
Ground Heat Exchangers ◽  
Heating And Cooling ◽  
Bored Pile ◽  
Research Organisation ◽  
Ground Source ◽  
Routine Design ◽  
Analytical Tools ◽  
Roll Out

The use of diaphragm or bored pile walls as ground heat exchangers as well as embedded retaining structures has gained popularity in recent years. Dual use of structure foundations in this way has the potential to reduce the costs of associated ground source heat pump systems, hence providing opportunities for the take up of renewable heating and cooling in our cities. Such systems have been recently constructed as part of major infrastructure schemes in London and Paris. However, there are no standard analytical analysis approaches to permit routine design of the thermal aspects of these novel planar ground heat exchangers. Hence assessment of energy availability on most practical projects either (i) adapts existing methods from ground heat exchangers of different geometry, which runs the risk of incurring errors; or (ii) resorts to time consuming numerical simulation, often in partnership with a research organisation. Neither approach is sustainable for routine roll out of the technology beyond prestige projects. To start to fill this gap in knowledge, this paper presents the first feasibility assessment of developing specific analytical tools for use with energy walls.

An investigation on the environmental impact of various Ground Heat Exchangers configurations

2021 ◽  
Vol 171 ◽  
pp. 592-605
Author(s):  
Lazaros Aresti ◽  
Paul Christodoulides ◽  
Georgios A. Florides
Keyword(s):  
Environmental Impact ◽  
Heat Exchangers ◽  
Ground Heat Exchangers

scholarly journals Application and Design Aspects of Ground Heat Exchangers

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2134
Author(s):  
Luka Boban ◽  
Dino Miše ◽  
Stjepan Herceg ◽  
Vladimir Soldo
Keyword(s):  
Renewable Energy ◽  
Heat Exchangers ◽  
Geothermal Energy ◽  
Energy Demand ◽  
Design Parameters ◽  
Direct Expansion ◽  
Alternative Source ◽  
Ground Heat Exchangers ◽  
Point Of Interest ◽  
Constant Source

With the constant increase in energy demand, using renewable energy has become a priority. Geothermal energy is a widely available, constant source of renewable energy that has shown great potential as an alternative source of energy in achieving global energy sustainability and environment protection. When exploiting geothermal energy, whether is for heating or cooling buildings or generating electricity, a ground heat exchanger (GHE) is the most important component, whose performance can be easily improved by following the latest design aspects. This article focuses on the application of different types of GHEs with attention directed to deep vertical borehole heat exchangers and direct expansion systems, which were not dealt with in detail in recent reviews. The article gives a review of the most recent advances in design aspects of GHE, namely pipe arrangement, materials, and working fluids. The influence of the main design parameters on the performance of horizontal, vertical, and shallow GHEs is discussed together with commonly used performance indicators for the evaluation of GHE. A survey of the available literature shows that thermal performance is mostly a point of interest, while hydraulic and/or economic performance is often not addressed, potentially resulting in non-optimal GHE design.

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