Results 1 to 10 of about 24 (24)

Geothermal Boreholes in Poland—Overview of the Current State of Knowledge

open access: yesEnergies, 2021
Geothermal energy can be useful after extraction from geothermal wells, borehole heat exchangers and/or natural sources. Types of geothermal boreholes are geothermal wells (for geothermal water production and injection) and borehole heat exchangers (for ...
Tomasz Sliwa   +4 more
doaj   +1 more source

Strength Tests of Hardened Cement Slurries for Energy Piles, with the Addition of Graphite and Graphene, in Terms of Increasing the Heat Transfer Efficiency

open access: yesEnergies, 2021
The development of civilization, and subsequent increase in the number of new buildings, poses engineering problems which are progressively more difficult to solve, especially in the field of geotechnics and geoengineering. When designing new facilities,
Tomasz Sliwa   +4 more
doaj   +1 more source

Research on Fresh and Hardened Sealing Slurries with the Addition of Magnesium Regarding Thermal Conductivity for Energy Piles and Borehole Heat Exchangers

open access: yesEnergies, 2021
Currently, renewable energy is increasingly important in the energy sector. One of the so-called renewable energy sources is geothermal energy. The most popular solution implemented by both small and large customers is the consumption of low-temperature ...
Tomasz Sliwa   +3 more
doaj   +1 more source

Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

open access: yesEnergies, 2022
Investigating the constructions of borehole heat exchangers with high efficiency (unit heat transfer between the heat carrier and ground) is important. One of the means to improve efficiency is the use of the most efficient construction of the borehole ...
Tomasz Sliwa   +3 more
doaj   +1 more source

A Critical Review on the Use of Shallow Geothermal Energy Systems for Heating and Cooling Purposes

open access: yesEnergies, 2022
The reduction of CO2 emissions has become a global concern. In this regard, the EU intends to cut CO2 emissions by 55% by 2030 compared to those of 1990.
Abdelazim Abbas Ahmed   +4 more
doaj   +1 more source

Influence of Rotation Speed and Air Pressure on the Down the Hole Drilling Velocity for Borehole Heat Exchanger Installation

open access: yesEnergies, 2020
The relation between rotation speed, air pressure and the velocity of air-rotary drilling using the down the hole method is determined in an empirical manner.
Tomasz Sliwa   +8 more
doaj   +1 more source

Utilization of Basalt Dust as Waste Material in Cement Grouts for Geothermal Application

open access: yesEnergies, 2022
Research on the utilization of the Earth’s heat focuses mainly on effective sourcing of energy accumulated in rock mass. One of the most important parameters is thermal conductivity, which can be modified using various compositions of cement grouts ...
Krzysztof Seńczuk   +2 more
doaj   +1 more source

Method of Averaging the Effective Thermal Conductivity Based on Thermal Response Tests of Borehole Heat Exchangers

open access: yesEnergies, 2020
This work concerns borehole heat exchangers and their testing using apparatus for thermal response tests. In the theoretical part of the article, an equation was derived from the known equation of heat flow, on which the interpretation of the thermal ...
Aneta Sapińska-Śliwa   +5 more
doaj   +1 more source

The analysis of long-term borehole heat exchanger system exploitation

open access: yesComputer Assisted Methods in Engineering and Science, 2017
The key issue in designing borehole heat exchangers (BHE) is the long-term performance of the ground source heat pump (GSHP) systems. The performance directly reflects economic profitability and depends on a large number of parameters including rock ...
Marek Jaszczur, Tomasz Śliwa
doaj   +1 more source

Biochemical fossils of the ancient transition from geoenergetics to bioenergetics in prokaryotic one carbon compound metabolism

open access: yesBiochimica et Biophysica Acta (BBA) - Bioenergetics, 2014
The deep dichotomy of archaea and bacteria is evident in many basic traits including ribosomal protein composition, membrane lipid synthesis, cell wall constituents, and flagellar composition. Here we explore that deep dichotomy further by examining the distribution of genes for the synthesis of the central carriers of one carbon units ...
Sousa, Filipa L., Martin, William F.
openaire   +2 more sources

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