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Wyświetlanie 1-15 z 71
Tytuł:
Comparative analysis of borehole heat exchanger use in different climatic conditions
Autorzy:
Śliwa, T.
Decan, G.
Sapińska-Śliwa, A.
Bieda, A.
Kowalski, T.
Powiązania:
https://bibliotekanauki.pl/articles/298830.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchangers
Opis:
The climatic conditions and the heating and cooling load between Ghent, Belgium, and Krakow, Poland, are compared. The cost of heating and cooling is calculated and compared. Heating in Belgium is done by using natural gas, just like in Poland, but due to higher gas prices, cost of heating is higher in Belgium than in Poland. That is why an interesting alternative for heating and cooling, namely borehole heat exchanger coupled with a heat pump, is calculated. This seems to be an economic and environmentally friendly alternative for heating and cooling.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 2; 483-494
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors influencing the precision of optimizing the values of definite scalar quantities according to the accepted criteria used in designing heat exchangers
Autorzy:
Łukaszewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/244118.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
optimization
heat exchangers
design
Opis:
The paper outlines the essential factors influencing the precision of optimizing the values of definite scalar quantities according to the criteria that are used in designing heat exchangers. The paper refers to the method of designing heat exchangers of technical power systems in view of the required reliability of these systems described in the work [1]. Optimization is used for the velocity values of the flow of definite fluids through the heat exchanger and for the cooling fluid temperature T2’’ at the output of the definite heat exchanger, as they occur in significant relationships with definite scalar quantities in designing heat exchangers. The paper emphasizes divergences in the results of calculations of the above mentioned optimized values of definite scalar quantities on the example of designing a shell and tube condenser of marine steam turbine. The criterion of optimizing the values of definite scalar quantities is the minimum of total costs min Σ n i=1 Ki τ in the time τ. The time is the set value τ z and constitutes the period, in which the optimization is considered. The paper presents the following factors: time assumption τ z of the period, in which optimization is considered, price assumption of electrical energy KCe consumed in order to pump the cooling water in time τ z, assumption of the values of efficiency τ p of the pump of the cooling water in time τ z, assumption of the values of the friction factor λ str2 of the inside surfaces of the condenser tube in time τ z, at the cooling water flow, the selection of a model of the function determining the Nusselt number Nu2 from the set of models that can be used in a given designing case, price assumption (the selection of a manufacturer) of heat exchanger area KCA of a shell and tube condenser, assumption of the forecasted thickness δos2 of fouling on the heat exchanger area from the side of the flow of the condenser cooling water in time τ z. Finally, the conclusions resulting from the paper’s contents are presented.
Źródło:
Journal of KONES; 2013, 20, 4; 237-244
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of diatomite on the thermal conductivity of solidified grout
Autorzy:
Dubiel, S.
Śliwa, T.
Kowalski, T.
Stryczek, S.
Wiśniowski, D.
Bieda, A.
Piwowarczyk, S.
Beszłej, J.
Naklicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/298779.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
heat exchangers
geothermal wells
diatomite
Opis:
The use of suitable materials for the preparation of sealing grout is an important issue from the point of view of the correct construction of borehole heat exchangers and geothermal wells. The minimization of the loss of heat during the transport of thermal water in geothermal wells can be achieved by use of sealing slurries with reduced thermal conductivity. Such slurries are also recommended in the upper part of deep borehole heat exchangers and the upper part of energy piles. The publication describes the impact of the addition of diatomite as a material lowering the thermal conductivity of solidified grout.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 3; 691-700
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the actual temperature of the side of a borehole heat exchanger
Autorzy:
Złotkowski, A.
Druzgała, A.
Powiązania:
https://bibliotekanauki.pl/articles/298974.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchangers
cement slurry
Opis:
Borehole heat exchangers (BHE) are made as hydraulic systems consolidated by cement slurry in boreholes. They mediate in heat exchange between the receiver on the surface (heat pump), and the reservoir of thermal energy (rock mass). In the analytical description of temperature changes accompanying energy download and return to the rock mass, the temperature of the entire borehole heat exchanger is assumed to be the same. In fact, the exchanger temperature changes both in the vertical and horizontal cross-sectional view of the exchanger. Accordingly, the temperature of the interface of the hardened cement slurry and the rock mass differs from the one which was adopted for design calculations. The article shows the differences between the theoretical and actual state, when the temperature was measured with a thermal imaging camera. It also includes suggestions regarding the mathematical description of temperature changes on the side surface of the heat exchanger. Measurements were made by a model of a BHE equipped with a single U-tube.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 4; 855-864
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal-hydraulic issues of flow boiling and condensation in organic Rankine cycle heat exchangers
Autorzy:
Mikielewicz, J.
Mikielewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/240039.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamika wymienników ciepła
stabilizacja przepływu
wymiennik ciepła
dynamics of heat exchangers
flow stability
heat exchangers
Opis:
In the paper presented are the issues related to the design and operation of micro heat exchangers, where phase changes can occur, applicable to the domestic micro combined heat and power (CHP) unit. Analysed is the stability of the two-phase .ow in such unit. A simple hydraulic model presented in the paper enables for the stability analysis of the system and analysis of disturbance propagation caused by a jump change of the flow rate. Equations of the system dynamics as well as properties of the working fluid are strongly non-linear. A proposed model can be applicable in designing the system of flow control in micro heat exchangers operating in the considered CHP unit.
Źródło:
Archives of Thermodynamics; 2012, 33, 1; 41-66
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza numeryczna pracy wymiennika ciepła z awaryjną nieszczelnością
Numerical analysis of heat exchanger with emergency leak
Autorzy:
Pospolita, W.
Cholewiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/134825.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
heat exchangers
emergency leak
numerical calculation
Opis:
Heat exchangers belong to the group of devices, whose proper operation is essential for the proper conduct of industrial processes. The growing influence of numerical methods in the design stage of exchanger, allows to optimize their design in terms of efficiency and meet the specified thermal parameters. A relatively new way to use numerical simulation is the study of unsteady heat transfer that characterized their work during failure. The article presents results of numerical analysis of the operation of a hypothetical heat exchanger with emergency leak of one of the coils. The effects of stream loss in the pipe and change of flow dynamics of entire system were taken into consideration. The importance of location of leak on the behavior of heat exchanger was also taken into account. The simulation was performed using the commercial software Autodesk Simulation CFD.
Źródło:
Technical Issues; 2016, 2; 53-59
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibility of the application of microstructures in heating and ventilation systems
Możliwości zastosowania mikropowierzchni strukturalnych w ogrzewnictwie i wentylacji
Autorzy:
Orman, Ł. J.
Powiązania:
https://bibliotekanauki.pl/articles/402395.pdf
Data publikacji:
2010
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
wymienniki ciepła
mikrostruktury
heat exchangers
microstructures
Opis:
Microstructural coatings may by successfully applied in phase-change heat exchangers to enhance heat transfer. They can be used in heating and ventilation systems as presented in the literature review. The test results of boiling heat transfer prove that it is possible to significantly increase heat flux comparing to the smooth surface if porous microstructures are applied. The measurements were conducted on the non-isothermal surface of the fin. Distilled water was used as the working fluid.
Źródło:
Structure and Environment; 2010, 2, 1; 41-45
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specifying the number of borehole heat exchangers based on thermal response test and geoenergetic analysis
Autorzy:
Śliwa, T.
Sapińska-Śliwa, A.
Gonet, A.
Jezuit, Z.
Bieda, A.
Kowalski, T.
Ozimek, J.
Złotkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/298689.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geoenergetics
borehole heat exchangers
geothermal heat pumps
Opis:
For the correct design, the number and the location of borehole heat exchangers, it is necessary to know thermal properties of rocks and the exchanger. This applies particularly to larger installations, more than 100 kW. One of the methods of determining these values is Thermal Response Test. This method is based on measurements in the first drilled borehole heat exchanger. Based on results of the TRT geothermal analysis is made. The analysis defines: the number of wells, the arrangement of wells, and the parameters of temperature of heat carrier after long-term use. This analysis based on calculations using specialist software. This paper presents the determination of the number of borehole heat exchangers and working conditions (temperature of the heat carrier) of an underground heat reservoir accessed using borehole heat exchangers for the building of the Primary School in Myszków.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 1; 273-290
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of heat transfer augmentation in heat exchangers with minichannels for marine applications
Autorzy:
Mikielewicz, D.
Wajs, J.
Powiązania:
https://bibliotekanauki.pl/articles/258932.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
heat transfer intensification
heat exchangers
pumping power
Opis:
In the paper, new trends in the development of microchannel heat exchangers are presented. The exchangers developed in this way can be applied in marine industry. Main attention is focused on heat exchanger design with reduced size of passages, namely based on microchannels. In authors’ opinion, future development of high power heat exchangers will be based on networks of micro heat exchangers.
Źródło:
Polish Maritime Research; 2017, S 1; 133-140
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of a temperature change in a cross‑section of borehole heat exchanger
Autorzy:
Zlotkowski, A.
Szczesiul, P.
Powiązania:
https://bibliotekanauki.pl/articles/299265.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchangers
heat pump
transport of heat
Opis:
Underground heat exchangers (BHE) are used witch elements to transport energy between the ground and other objects on the surface of the land. For simplification described in mathematical apparatus, they works are explain how linear heat source. The temperature is the same in all bodies of this model. This reduction to let easy describe theoretical changes temperature in BHE through transporting energy to / from rock in analytic mathematic method. The bad effect of this method is present by the same value of temperature in horizontal cross‑section and along BHE. The analysis of change of temperature field in the sealing cement BHE is a possibility for numerical simulation or laboratory model. Computer simulation needed according energy transport law. It to say about quantity of energy conducting between horizontal cross‑section of BHE cells, on which is divided. The second method obtains value of temperature points of the sealing cement. This is to be realized by sensors set up in to the horizontal cross‑section of BHE of laboratory model. This is possible thanks constructed the model of cross‑section of BHE.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 4; 459-468
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of a heater and borehole heat exchangers for the regeneration of heat resources in the rock mass on the example of the Geoenergetics Laboratory, AGH UST
Autorzy:
Poniedziałek, M.
Śliwa, T.
Powiązania:
https://bibliotekanauki.pl/articles/298673.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchangers
geoenergetics
energy resources
Opis:
The regeneration of rock mass heat resources with the use of four sources can be done with the use of installations owned by the Geoenergetics Laboratory, Faculty of Drilling, Oil and Gas AGH UST. This paper is devoted to one of them, i.e. an air heater. In the case of increased thermal energy consumption the rock mass can be excessively cooled, which may cause problems with providing thermal standard for buildings making use of ground as a source of heat. New additional sources supplementing the process of heat resources regeneration is a key element of maintaining the high efficiency of the heating-cooling system. A real case exemplifying how free thermal energy can be stored with an air heater in the summer season is discussed in this paper. The procedure and respective conclusions are analyzed. The results of most important measurements are tabularized and their functions plotted in the form graphs.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 2; 353-359
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of Vacuum Insulated Tubing in Deep Borehole Heat Exchangers
Autorzy:
Śliwa, T.
Kruszewski, M.
Assadi, M.
Sapińska-Śliwa, A.
Powiązania:
https://bibliotekanauki.pl/articles/299064.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Vacuum Insulated Tubing (VIT)
heat exchangers
Opis:
The world’s demand for energy is constantly increasing mainly due to population growth and improved living standards. Currently, the share of electricity generation is 37 of the global primary energy consumption. Fossil-based electricity production is accounted for 68 of the total generation with coal, the most carbon-intensive fossil fuel, being the largest contributor (41) to the world’s electricity supply in 2012. Electricity demand is projected to grow rapidly and is also expected to be 70 higher in 2035, than the current demand. The Polish energy sector is heavily dependent on coal, resulting in large CO2 emission per capita. Poland has considerable potential for geothermal energy production, as there is a large number of deep, abandoned wells that might be utilized for geothermal energy production. Utilizing these resources would contribute to the CO2 emission reduction without negative impact on security of energy supply. Following paper describes method of reconstructing negative or abandoned oil and gas wells for Deep Borehole Heat Exchangers (DBHE). In many old boreholes, exploiting underground geothermal waters is impossible, thus adaptation for DBHE is sometimes the only option to utilize geothermal heat reservoirs. The insulated coaxial inner column which enables the circulation of heat carrier plays the crucial role in effective functioning of DBHE systems. Vacuum Insulated Tubing (VIT) can improve heat production as well as increase efficient energy use. This technique found plethora of applications in offshore and onshore deep drilling and production. Throughout recent years, VIT technology is being more commonly applied in geothermal industry. Negative or abandoned wells could be reconstructed for DBHE. To maximize the heat uptake from such boreholes, it is advised to use inner column made from material with lowest possible thermal conductivity coefficient. Article deals with possible application of vacuum pipes as inner column in deep coaxial borehole heat exchangers.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 2; 597-617
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of ORC’s for micro power generation
Autorzy:
Mikielewicz, Jarosław
Mikielewicz, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1191859.pdf
Data publikacji:
2018
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
CHP
ORC
heat exchangers
heat transfer intensification
thermodynamics
Opis:
In the paper, new trends in development of micro power generation of heat and electricity are presented. New type of CHP for domestic usage is developed in the Institute of Fluid-Flow Machinery PAS and methods of its design are presented. The most promising trends in equipment of ORC cycle for this purpose were discussed. Main attention was focused on micro-heat exchangers design based on micro-channels and micro-jets. In our opinion future development of high power heat exchangers will be based on nets micro-heat exchangers.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2018, 1; 51--72
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of changes in the thickness of a perforated plate of the heat exchanger on its structural stability
Wpływ zmian grubości płyty perforowanej wymiennika ciepła na stateczność konstrukcji
Autorzy:
Chudzik, A.
Świniarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/282061.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
finite element method
heat exchangers
heating pipes
Opis:
One of the most important elements of heat exchangers are perforated bottoms. These are perforated plates of significant thickness, in which heating cartridge pipes are mounted. For the designers of heat exchangers, the strength analusis of the connection between the elements, which allows for the determination of the state of stress and calculation of displacements of the perforated bottom after fixing the pipes in it, is of special importance. It results from carried out computations that the maximum reduced stresses in the perforated bottom are significantly lower than the values of admissible stresses. In this paper, computations of stresses and strains for various thicknesses of the perforated bottom have been presented. As a results of a decrease in the thickness of the perforated bottom, its deflectionincrease, and thus the heating system pipes are more exposed to strains and losses of stability.
Jednym z istotnych elementów wymiennika ciepła są dna sitowe - płyty perforowane o znacznej grubości, w których zamocowane są rurki wkładu grzewczego. Dla konstruktorów wymienników ciepła istotna jest analiza wytrzymałościowa połączenia pozwalająca na określenie stanu naprężeń oraz obliczenie przemieszczeń dna sitowego po zamocowaniu rurek. Z przeprowadzonych obliczeń wynika, że maksymalne naprężenia zredukowane w dnie sitowym są dużo niższe od wartości naprężeń dopuszczalnych. W pracy przedstawiono obliczenia naprężeń i odkształceń dla różnych grubości dna sitowego. Na skutek zmniejszenia grubości dna sitowego zwiększa się jego napięcia, przez co rurki wkładu grzewczego bardziej są narażone na utratę stateczności.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 2; 325-334
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Different Heat Exchangers and the Thermal Activities of Different Designs
Autorzy:
Ipek, O.
Kan, M.
Gurel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031281.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
heat exchangers
compact heat exchanger
micro channel heat exchanger
Opis:
In this study, instead of gasketed or brazed plate heat exchangers, which are used in various fields of application, a direct metal sintering method is used to design a heat exchanger with its original geometry and with different geometries. Studies of heat exchangers found in published literature were reviewed, and the thermal behaviors of the proposed unique designs were examined. Usually heat exchangers using this design do not use channel spacing angles of 30-45-60-75° for the plate ducts. The thermal behaviors of the fluid-circulating systems were analyzed using ANSYS FLUENT software, and they used the boundary conditions found in the literature for this design. Heat transfer between the heat exchanger channels and channel walls was calculated. The analyses results show that an increase in the amount of heat transfer surface area and also an increase in surface roughness increased the amount of positive heat transfer.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 580-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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