scholarly journals Thermal regime of mining products in the presence of thermal water on the example of the mines of Tkvarcheli of Lenin

2021 ◽  
Author(s):  
Omar Lanchava ◽  
Shurman Oniani ◽  
Teimuraz Pirtskhalava
Keyword(s):  
Mass Transfer ◽  
Thermal Water ◽  
Heat Content ◽  
Climatic Conditions ◽  
Hot Water ◽  
Thermal Waters ◽  
Air Flow Rate ◽  
Mine Workings ◽  
Water Cut ◽  
Intense Heat

Mine workings located in the areas of the ascending movement of thermal waters are characterized by intense water flow and significant water cut. Our observations and calculations showed that when hot water is poured into the workings, mainly due to the intense heat and mass transfer from water to air, the increase in the heat content of the ventilation stream increases sharply and over 100-300 m (depending on the air flow rate) the temperature mine air saturated with water vapor becomes approximately equal to the temperature of hot waters. Therefore, without preliminary diversion or elimination of the inflow of hot water, in this case, the creation of normal climatic conditions in mine workings is practically impossible.

scholarly journals Integrated development of low-temperature thermal waters

2022 ◽  
Vol 2150 (1) ◽  
pp. 012032
Author(s):  
D A Alkhasova ◽  
B A Alkhasov
Keyword(s):  
Low Temperature ◽  
Thermal Water ◽  
District Heating ◽  
Hot Water ◽  
Thermal Waters ◽  
Integrated Development ◽  
A Value ◽  
Heat Potential ◽  
Biological Complexes

Abstract The research concerns the efficient development of low-potential thermal waters in the East-Ciscaucasian artesian basin. A technology is proposed for the integrated development of low-temperature thermal water, using its heat potential for district heating and hot water supply, as well the water itself for various water management purposes, with its quality previously brought to the standards of drinking water. Various chemical water treatment units are suggested for this purpose, with their design and technological features being formed depending on the quality of the source water. The system will enable the maximization of the resource potential of the geothermal well and its all-year-round operation. The paper shows the efficiency of using the potential of geothermal energy resources in energy- biological complexes. The geothermal-biogas technology with the integrated application of thermal waters for various needs is presented. Such thermal water utilization provides for the most efficient use of its thermal potential with a decrease in temperature to a value close to the ambient temperature.

scholarly journals New Deterministic Mathematical Model for Estimating the Useful Energy Output of a Medium-Sized Solar Domestic Hot Water System

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2753
Author(s):  
Miroslaw Zukowski ◽  
Walery Jezierski
Keyword(s):  
Thermal Power ◽  
Optimization Procedure ◽  
Climatic Conditions ◽  
Point Of View ◽  
Hot Water ◽  
Energy Output ◽  
Daily Consumption ◽  
Software Environment ◽  
Optical Efficiency ◽  
Domestic Hot Water

According to the authors of this paper, the mathematical point of view allows us to see what sometimes cannot be seen from the designer’s point of view. The aim of this study was to estimate the influence of the most important parameters (volume of heat storage tanks, daily consumption of domestic hot water, optical efficiency, heat loss coefficient, and total area of a solar collector) on the thermal power output of solar domestic hot water (SDHW) system in European climatic conditions. Three deterministic mathematical models of these relationships for Madrid, Budapest, and Helsinki were created. The database for the development of these models was carried out using computer simulations made in the TRNSYS software environment. The SDHW system located at the Bialystok University of Technology (Poland) was the source of the measurement results used to validate the simulation model. The mathematical optimization procedure showed that the maximum annual useful energy output that can be obtained from 1 m2 of gross collector area is 1303 kWh in the case of Madrid, 918.5 kWh for Budapest, and 768 kWh for Helsinki weather conditions.

RENEWABLE ENERGY INTEGRATION FOR HOT WATER SUPPLY AND HEATING OF BUILDINGS

2021 ◽  
pp. 3-12
Author(s):  
Yu. Selikhov ◽  
K. Gorbunov ◽  
V. Stasov
Keyword(s):  
Solar Energy ◽  
Heat Production ◽  
Heat Supply ◽  
Alternative Energy ◽  
Fossil Fuel ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
Economic Feasibility ◽  
Hot Water ◽  
The Cost

Solar energy is widely used in solar systems, where economy and ecology are combined. Namely, this represents an important moment in the era of depletion of energy resources. The use of solar energy is a promising economical item for all countries of the world, meeting their interests also in terms of energy independence, thanks to which it is confidently gaining a stable position in the global energy sector. The cost of heat obtained through the use of solar installations largely depends on the radiation and climatic conditions of the area where the solar installation is used. The climatic conditions of our country, especially the south, make it possible to use the energy of the Sun to cover a significant part of the need for heat. A decrease in the reserves of fossil fuel and its rise in price have led to the development of optimal technical solutions, efficiency and economic feasibility of using solar installations. And today this is no longer an idle curiosity, but a conscious desire of homeowners to save not only their financial budget, but also health, which is possible only with the use of alternative energy sources, such as: double-circuit solar installations, geothermal heat pumps (HP), wind power generators. The problem is especially acute in the heat supply of housing and communal services (HCS), where the cost of fuel for heat production is several times higher than the cost of electricity. The main disadvantages of centralized heat supply sources are low energy, economic and environmental efficiency. And high transport tariffs for the delivery of energy carriers and frequent accidents on heating mains exacerbate the negative factors inherent in traditional district heating. One of the most effective energy-saving methods that make it possible to save fossil fuel, reduce environmental pollution, and meet the needs of consumers in process heat is the use of heat pump technologies for heat production.

NUMERICAL STUDIES ON VERTICAL TUBULAR GENERATOR IN VAPOR ABSORPTION REFRIGERATION SYSTEM

2011 ◽  
Vol 19 (02) ◽  
pp. 121-129 ◽  
Author(s):  
PASUPATHY BALAMURUGAN ◽  
ANNAMALAI MANI
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Computer Code ◽  
Vertical Tube ◽  
Hot Water ◽  
Convective Boiling ◽  
Model Equations ◽  
Absorption Refrigeration System ◽  
Problem Solvers ◽  
Vapor Absorption Refrigeration

A model has been developed based on Colburn–Drew type formulation to analyze a vertical tube in tube stainless steel generator with forced convective boiling. Desorption of refrigerant vapor from refrigerant–absorbent solution takes place in the inner tube of the generator, when hot water through the annulus is used as heating medium. Simultaneous heat and mass transfer phenomena of desorption are described mathematically using the mass and energy balances, considering the heat and mass transfer resistances in liquid as well as vapor phases. Model equations are solved simultaneously by means of initial value problem solvers using explicit Runge–Kutta method with 4th order accuracy. A computer code has been developed in MATLAB to obtain the results. A parametric analysis has also been performed to study the effect of various parameters on the performance of the generator.

HyTheC - Multidisciplinary approach to conceptual modelling of hydrothermal systems in Croatia

2021 ◽  
Author(s):  
Mirja Pavić ◽  
Staša Borović ◽  
Maja Briški ◽  
Tihomir Frangen ◽  
Kosta Urumović
Keyword(s):  
Thermal Water ◽  
Pannonian Basin ◽  
Structural Characteristics ◽  
Hydrothermal Systems ◽  
Data Availability ◽  
System Level ◽  
Thermal Waters ◽  
Geophysical Research ◽  
Research Project ◽  
Systems Research

<p>The increase in thermal water utilisation is foreseen by many European and Croatian strategic documents regulating energetics, tourism, environmental protection and sustainable development. Croatian Geological Survey wishes to establish a multidisciplinary group for hydrothermal systems research which will contribute to responsible geothermal development in our country through a 5-year research project HyTheC which started in 2020.</p><p>Pannonian part of Croatia has favourable geothermal characteristics and natural thermal water springs emerge at two dozen localities, with temperatures up to 65 °C. These waters have been used for millennia, and in the past fifty years they are a basis for the development of tourism and health care centres which use the thermal water resource for heating, therapy and recreation (Borović & Marković, 2015). As their water demand increased, higher quantities were abstracted and additional intake structures and wells were constructed.</p><p>Thermal springs are part of hydrothermal systems which include: recharge areas in the mountainous hinterlands of the springs; geothermal aquifers - in Croatia mostly fractured and karstified Mesozoic carbonate rocks (Borović et al., 2016) - in which water resides and gets heated due to heat flow from the Earth; and discharge areas in places with favourable structural characteristics of higher permeability. The continuous functioning of such systems depends on a delicate balance between groundwater flow velocities, precipitation/dissolution processes and structural framework.</p><p>In order to maintain that balance and use thermal water resources in a sustainable manner, a system-level understanding is required. Multidisciplinary methodology (structural geology, hydrogeology, geothermal, hydrogeochemical and geophysical research and remote sensing) will be used to construct conceptual models of systems, perform 3D geological modelling, hydrogeological and thermal parametrisation of the geological units involved in the thermal fluid flow, and conduct numerical simulations of system functioning in undisturbed conditions and with different extraction scenarios.</p><p>This methodology will be tested in three pilot areas in Croatia where thermal water is being utilized (Daruvar, Hrvatsko zagorje and Topusko). These three areas have significantly different levels of initial data availability and it shall therefore be determined which methodology and order of application of different methods should be applied while researching the systems with considerable existing data, medium amount of data and very scarce data, respectively.</p><p>Keywords : hydrothermal system, natural thermal spring, multidisciplinary research, Croatia</p><p>References</p><p>Borović, S. & Marković, T. 2015 : Utilization and tourism valorisation of geothermal waters in Croatia. Renewable and Sustainable Energy Reviews, 44, pp. 52-63.</p><p>Borović, S., Marković, T., Larva, O., Brkić, Ž. & Mraz, V. 2016 : Mineral and Thermal Waters in the Croatian Part of the Pannonian Basin. U: Papić, P., ur., Mineral and Thermal Waters of Southeastern Europe. Cham: Springer, pp. 31-45.</p><p> </p><p>ACKNOWLEDGMENT</p><p>The Installation Research project HyTheC (UIP-2019-04-1218) is funded by the Croatian Science Foundation.</p>

scholarly journals Surface predictor of overturning circulation and heat content change in the subpolar North Atlantic

Ocean Science ◽  
2019 ◽  
Vol 15 (3) ◽  
pp. 809-817 ◽  
Author(s):  
Damien G. Desbruyères ◽  
Herlé Mercier ◽  
Guillaume Maze ◽  
Nathalie Daniault
Keyword(s):  
North Atlantic ◽  
Spatial Scales ◽  
Low Frequency ◽  
Heat Content ◽  
Climatic Conditions ◽  
Meridional Overturning Circulation ◽  
Overturning Circulation ◽  
The North ◽  
Wide Range ◽  
Key Aspects

Abstract. The Atlantic Meridional Overturning Circulation (AMOC) impacts ocean and atmosphere temperatures on a wide range of temporal and spatial scales. Here we use observational datasets to validate model-based inferences on the usefulness of thermodynamics theory in reconstructing AMOC variability at low frequency, and further build on this reconstruction to provide prediction of the near-future (2019–2022) North Atlantic state. An easily observed surface quantity – the rate of warm to cold transformation of water masses at high latitudes – is found to lead the observed AMOC at 45∘ N by 5–6 years and to drive its 1993–2010 decline and its ongoing recovery, with suggestive prediction of extreme intensities for the early 2020s. We further demonstrate that AMOC variability drove a bi-decadal warming-to-cooling reversal in the subpolar North Atlantic before triggering a recent return to warming conditions that should prevail at least until 2021. Overall, this mechanistic approach of AMOC variability and its impact on ocean temperature brings new key aspects for understanding and predicting climatic conditions in the North Atlantic and beyond.

Hybrid Energy Thermal Water Pump for Producing Hot Water from a Shallow Well in Thailand

2016 ◽  
Vol 142 (3) ◽  
pp. 04015023
Author(s):  
Panusak Moonsri ◽  
Janthana Kunchornrat ◽  
Pichai Namprakai
Keyword(s):  
Thermal Water ◽  
Hot Water ◽  
Water Pump ◽  
Hybrid Energy

scholarly journals Energy-efficient solar power plants for autonomous heat supply in Russia

2018 ◽  
Vol 251 ◽  
pp. 03012 ◽  
Author(s):  
Pavel Khavanov ◽  
Anatoly Chulenyov
Keyword(s):  
Power Plants ◽  
Renewable Energy Sources ◽  
Water System ◽  
Climatic Conditions ◽  
Hot Water ◽  
Partial Replacement ◽  
Water Heating ◽  
Technical Requirements ◽  
Solar Power Plants ◽  
Technical Operation

In the complex of measures for energy saving, partial replacement and reduction of consumption of fossil energy and electricity, water heating solar installations for heating systems have long been in practice for small energy facilities. Solar energy is one of the most dynamically developing directions of use of renewable energy sources, especially the introduction of which are associated with climatic conditions and technical requirements of their application. The territory of Russia is located mainly in the cold climatic zone and in regions with a sharply continental climate in which the operation of water heating solar plants is justified and most rational in seasonal use, in this case, their technical operation is carried out mainly during the non-heating period of the year. In such installations, in a number of cases, it is possible to avoid the need to use “non-freezing” heat carriers, and therefore the thermal schemes of the plants are simpler in design and cheaper, since heat exchangers or bivalent storage tanks can be excluded to transfer heat from the antifreeze to the water of the heating circuit or hot water system.

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