The underground heat exchanger system proposed in this work considers energy screw piles as the primary underground heat exchangers while the remaining screw
Energy piles can be exploited as ground heat exchangers of a ground source heat pump system. In such application, the energy pile and its surrounding soil are subjected
The underground heat exchanger system proposed in this work considers energy screw piles as the primary underground heat exchangers while the remaining screw piles filled with PCM are used as thermal storage piles. Since screw piles have small diameters, a large number of them is required to form a strong foundation for buildings
Energy piles, combined ground source heat pumps (GSHP) with the traditional pile foundation, have the advantages of high heat transfer efficiency, less space occupation and low cost. This paper summarizes the latest research on the heat transfer and bearing capacity of energy piles. It is found that S-shaped tubes have the largest heat transfer area and the best
Energy piles can be exploited as ground heat exchangers of a ground source heat pump system. In such application, the energy pile and its surrounding soil are subjected to temperature changes that could significantly affect the pile–soil interaction behaviour. The aim of this paper is to review the current state of knowledge on the
Deliberation upon the impact of heat exchangers'' design on energy storage performance. • Outline of innovative modelling and design methods, alongside recent research trends. Abstract. The cryogenic industry has experienced remarkable expansion in recent years. Cryogenic technologies are commonly used for industrial processes, such as air separation
Energy piles offer a promising and eco-friendly technique to heat or cool buildings. Energy piles can be exploited as ground heat exchangers of a ground source heat pump system. In such application, the energy pile and its surrounding soil are subjected to temperature changes that could significantly affect the pile-soil interaction behaviour.
Deep borehole heat exchanger is promising and competitive for seasonal heat storage in the limited space underground with great efficiency. However, seasonal heat storage performance of the essentially deep borehole heat exchanger reaching kilometers underground was seldom studied. In addition, previous research rarely achieved comprehensive
Thermal Energy Storage (TES) systems are pivotal in advancing net-zero energy transitions, particularly in the energy sector, which is a major contributor to climate change due to carbon emissions. In electrical vehicles (EVs), TES systems enhance battery performance and regulate cabin temperatures, thus improving energy efficiency and extending vehicle
Energy piles, combined ground source heat pumps (GSHP) with the traditional pile foundation, have the advantages of high heat transfer efficiency, less space occupation and low cost. This paper summarizes the
An energy pile-based ground source heat pump system coupled with seasonal solar energy storage was proposed and tailored for high-rise residential buildings to satisfy
The influence laws of the nanofluids on the flow rate and heat transfer efficiency in the energy pile were calculated through the temperature difference between the inlet and
The influence laws of the nanofluids on the flow rate and heat transfer efficiency in the energy pile were calculated through the temperature difference between the inlet and outlet of the heat exchange tube. The results reveal that the nanofluids used in the experiment exert a optimization influence on the heat transfer of energy
The efficiency and ability to control the energy exchanges in thermal energy storage systems using the sensible and latent heat thermodynamic processes depends on the best configuration in the heat exchanger''s design. In 1996, Adrian Bejan introduced the Constructal Theory, which design tools have since been explored to predict the evolution of
The design of energy piles can be challengeable due to their complicated geometries and the requirement of mechanical load. This study focuses on the heat transfer across the concrete–soil interface of energy piles in urban areas. Case studies from two projects, the Lambeth College and Shell Centre projects, are presented and discussed. The
Relevant keywords such as "energy storage", "sensible heat storage", "latent heat storage", "ground heat exchanger", "ground-source heat pump", "geothermal heat pumps", "earth energy systems", and "ground-source systems" were used with different Boolean operators and filters to search the papers from different sources. Most of the relevant literature was
Latent heat energy storage (LHES) or latent heat thermal energy storage (LHTES) or latent thermal energy storage (LTES) is considered a crucial energy technology by creating compact and efficient thermal energy storage units, which are highly desirable in our current and future energy market for increased use and integration of renewable energy
The heat transfer is carried out in an energy pile through ground heat exchanger (GHE) pipes installed along their reinforcement cage, where the heat transfer fluid (HTF) circulates and exchanges heat with the surrounding.
The results show the heat storage characteristic of layered backfill body can be significantly improved by adding fins to the double-pipe heat exchanger. On the whole, the heat storage effect of
Energy piles offer a promising and eco-friendly technique to heat or cool buildings. Energy piles can be exploited as ground heat exchangers of a ground source heat pump system. In such application, the energy pile and its
The heat transfer is carried out in an energy pile through ground heat exchanger (GHE) pipes installed along their reinforcement cage, where the heat transfer fluid (HTF)
PV+ESS+Charger system integrates photovoltaic power generation, energy storage system and charging pile to form a microgrid, ensuring a basic balance between local energy production
The design of energy piles can be challengeable due to their complicated geometries and the requirement of mechanical load. This study focuses on the heat transfer across the concrete–soil interface of energy piles
energy pile through ground heat exchanger (GHE) pipes installed along their reinforcement cage, where the heat transfer fluid (HTF) circulates and exchanges heat with the surrounding.
An energy pile-based ground source heat pump system coupled with seasonal solar energy storage was proposed and tailored for high-rise residential buildings to satisfy their heating/cooling demands. An optimal design procedure was developed for the coupled system accounting for the constraints of limiting the temperature changes of the energy
Modelling and experimental validation of advanced adiabatic compressed air energy storage with off-design heat exchanger. Weiqi Zhang, Weiqi Zhang . College of Electrical Engineering, Xinjiang University, No.1230,
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energy pile through ground heat exchanger (GHE) pipes installed along their reinforcement cage, where the heat transfer fluid (HTF) circulates and exchanges heat with the surrounding. Despite the rapid spread of this technology, especially in the
PV+ESS+Charger system integrates photovoltaic power generation, energy storage system and charging pile to form a microgrid, ensuring a basic balance between local energy production and consumption. Envicool provides customers with highly reliable temperature control solutions in this field with its rich experience in energy storage, charging
The thermal process goes in an energy pile, as in a borehole heat exchanger, in different stages: heat transfer through the ground, conduction through pile concrete and heat exchanger pipes, and convection in the fluid and at the interface with the inner surface of the pipes (Fig. 2).
As shown in Fig. 5 (a), for the case in unfavourable ground conditions, the computed results corresponding to the actual pile length of 30 m underestimated the daily-averaged rate of heat exchange by about 25% for both the modes of heat extraction and injection. To improve the situation, an equivalent pile length was calibrated.
The energy pile represents an embedment of heat exchange pipes into the pile body. In this way, it can serve as a vertical heat exchanger in addition to its primary function of supporting the building. The additional land use and construction costs related to the conventional vertical boreholes of the GSHP system can thus be saved.
The efficiency of heat transfer in an energy pile depends on the design parameters concerning the characteristics of the pile, pipe, concrete, fluid, and ground. The configuration of heat exchanger pipes is found to be the most influential parameter.
For the large-diameter energy piles, where more than 5-pairs of U-tubes can be installed, Park et al. (2015) revealed that the heat exchanger pipes in helix shape have the optimal configuration, given the economic feasibility and the thermal performance.
Providing high thermal efficiency, preventing airlock, and limiting thermal short-circuiting are the advantages that have led some studies to consider the spiral shape as the best configuration of the pile heat exchanger (Dehghan, 2018; Man et al., 2017).
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