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Wyświetlanie 1-10 z 125
Tytuł:
Thermal performance of energy storage vessel
Autorzy:
Jurigova, M.
Minarova, M.
Chmurny, I.
Powiązania:
https://bibliotekanauki.pl/articles/131595.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Komisja Inżynierii Budowlanej PAN Oddział w Katowicach
Tematy:
thermal energy storage
hot water
mathematical model
magazynowanie energii cieplnej
woda ciepła
model matematyczny
Opis:
This paper is focused on an analysis of thermal energy performance of storage vessel[4]. This storage system consists of two concentric cylindrical containers made of concrete, between these two layers there is a thermal insulation layer – the vacuum-like one. The inner container is filled by water intended to operate as a heat accumulation medium and temperature of the water is assumed as 90ºC. The cooling process was simulated for a period of 30 days in the ANSYS software environment. The simulation showed that the analyzed type of heat storage vessel is able to keep the thermal Energy relatively efficiently.
Źródło:
Roczniki Inżynierii Budowlanej; 2015, 15; 11-16
1505-8425
Pojawia się w:
Roczniki Inżynierii Budowlanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance of novel indirect passive solar dryer
Autorzy:
Al-Jethelah, Manar
Deyab, Hussam
Yaseen, Tadahmun
Powiązania:
https://bibliotekanauki.pl/articles/35534092.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
solar dryer
passive
flat collector
efficiency
Opis:
An experimental investigation was conducted to study the performance of a novel indirect type free convection solar dryer. The novel and a conventional indirect passive solar dryer were built. Solar irradiation and temperature of different locations were recorded. The air at the drying chamber entrance, lower space, and upper space temperatures besides the thermal efficiency of the novel dryer were 68, 39, 49 and 85%, respectively, higher than the conventional one.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 293-303
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance of the thermal storage energy with phase change material
Autorzy:
Bałon, Paweł
Kiełbasa, Bartłomiej
Kowalski, Łukasz
Smusz, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2204648.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
energy storage
phase change material
PCM
heat accumulation
Opis:
Values of energy supply and demand vary within the same timeframe and are not equal. Consequently, to minimise the amount of energy wasted, there is a need to use various types of energy storing systems. Recently, one can observe a trend in which phase change materials (PCM) have gained popularity as materials that can store an excess of heat energy. In this research, the authors ana-lysed paraffin wax (cheese wax)’s capability as a PCM energy storing material for a low temperature energy-storage device. Due to the relatively low thermal conductivity of wax, the authors also analysed open-cell ceramic Al2O3/SiC composite foams’ (in which the PCM was dispersed) influence on heat exchange process. Thermal analysis on paraffin wax was performed, determining its specific heat in liquid and solid state, latent heat (LH) of melting, melting temperature and thermal conductivity. Thermal tests were also performed on thermal energy container (with built-in PCM and ceramic foams) for transient heat transfer. Heat transfer coefficient and value of accumulated energy amount were determined.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 76--84
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance analysis of manned airships in a thermally variable environment
Autorzy:
Shi, Hong
Liu, Meinan
Chen, Jiamin
Zou, Yitao
Powiązania:
https://bibliotekanauki.pl/articles/2173708.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
manned airship
thermal performance
nacelle
temperature difference
flight position
sterowiec załogowy
wydajność cieplna
gondola
różnica temperatur
pozycja lotu
Opis:
The safety and reliability of the manned airship depend to a considerable extent on its thermal performance. In this paper, heat balance equations are developed and solved in the C++ programming language. The temperature variation of the enclosure, gasbag, and nacelles of the manned airship is investigated. In addition, the effects of season, latitude, and orientation on the thermal performance of the manned airship and the airship nacelle are investigated. The results show that: (1) The average temperature difference of the nacelle surface at the same time is 25 K, while the maximum temperature difference in the nacelle is 29 K during the day, (2) the temperature distribution in the nacelle is similar in spring and autumn, with maximum temperature between 306 K and 309 K. The maximum temperature in the nacelle is between 300 K and 303 K in winter while the maximum temperature in the nacelles is between 309 K and 315 K in summer, (3) as the flight position of the manned airship changes from 20°N to 60°N, the average nacelle temperature varies slightly by about 1 K. However, as the latitude increases, the high- temperature region shifts from the bottom of the nacelle to the side of the nacelle, and (4) the temperature distribution of the upper envelope of the airship varies considerably with orientation. However, the average temperature of the nacelle is less impacted by orientation. These results are useful for understanding the thermal performance of manned airships.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e143105
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of filling ratio on thermal performance and thermal parameters of closed loop pulsating heat pipes
Autorzy:
Kolková, Z.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402056.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
closed loop pulsating heat pipe
thermal performance
evaporation
condensation
filling ratio
thermal resistance
temperature
Opis:
Improving the performance of electrical components needs higher heat removal from these systems. One of the solutions available is to use a sealed heat pipe with a throbbing filling, where development meets the current requirements for intensification of heat removal and elimination of moving parts cooling systems. Heat pipes operate using phase change working fluid, and it is evaporation and condensation. They have a meandering shape and are characterized by high intensity of heat transfer, high durability and reliability. Advantage of these tubes is that it is not necessary to create the internal capillary structure for transporting liquid and they need no pump to the working fluid circulation. They have a simple structure, low cost, high performance, and they can be used for various structural applications. The choice of working fluid volume and performance affects thermal performance. Distilled water, ethanol and acetone were used in the performance ranges of 0-80%.
Źródło:
Structure and Environment; 2013, 5, 4; 37-40
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of working position for thermal performance of the capillary heat pipe
Autorzy:
Kosa, L.
Jobb, M.
Nemec, P.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402189.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
capillary heat pipe
thermal performance
working position
Opis:
This experiment is concentrated on working position for optimization of capillary heat pipe. The main objective was to find optimal working position for capillary heat pipe. Working position is an important part for function of the heat pipe. A change in working position should change thermal performance of capillary heat pipe.
Źródło:
Structure and Environment; 2014, 6, 1; 46-48
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obliczenia energetyczne budynków - dyskusja założeń
Thermal performance of buildings - discussion of assumptions
Autorzy:
Panek, A
Rucińska, J
Powiązania:
https://bibliotekanauki.pl/articles/362744.pdf
Data publikacji:
2010
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
zużycie energii
ocena energetyczna
energy use
energy performance of buildings
Opis:
Artykuł zawiera opis metody godzinowej obliczania zapotrzebowania energii do ogrzewania i chłodzenia. Wyniki zapotrzebowania na energię do ogrzewania i chłodzenia siedmiu budynków testowych uzyskane przy jej pomocy porównano z wynikami otrzymanymi z metody bilansowej, programu Audytor OZC oraz TRNSYS.
The paper presents description of the hourly method used for calculation of required energy usage for heating and cooling. The comparison of results of calculation was done with TRNSYS, Audytor OZC, hourly and seasonal method for seven buildings.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 4, 4; 35-41
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of thermal performance factor for solar air heaters with artificially roughened channels
Autorzy:
Siddique, Waseem
Raheem, Aneeq
Aqeel, Muhammad
Qayyum, Sualeh
Salamen, Tareq
Waheed, Khalid
Qureshi, Kamran
Powiązania:
https://bibliotekanauki.pl/articles/1845043.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turbulence promoter
solar air heater
heat transfer enhancement
thermal performance factor
słoneczny grzejnik powietrzny
intensyfikacja wymiany ciepła
współczynnik wydajności cieplnej
Opis:
Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 2; 195-225
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An effect of binary fluid on the thermal performance of pulsation heat pipe
Autorzy:
Barrak, Anwar S.
Ali, Nawfal M
Ali, Hussein Hayder Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/2174164.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
rura cieplna
przepływ dwufazowy
przepływ ciepła
binary fluid
oscillation heat pipe
two phase flow
thermal resistance
heat transfer
Opis:
A pulsation heat pipe is an efficient heat pipe used in many engineering applications. This study aims to test the effect of working fluids on the thermal performance of pulsation heat pipe. Seven turned pulsation heat pipes were designed and manufactured from a copper pipe with a 3.5 mm inner diameter. The lengths of an evaporation part, an adiabatic passage, and a condenser part were 300 mm, 210 mm, and 300 mm, respectively. In this study, three different fluids were used as the working fluid: distilled water, methanol, and binary fluid (a mixture of water and methanol) with a 50% filling ratio. Compared to water, the experimental results suggested that methanol had a better thermal performance when used as a working fluid in the PHP. On the other hand, a binary fluid enhanced the lower thermal performance of water (29% reduction in the thermal resistance and a 20% increase in the effective thermal conductivity of the PHP).
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 21--34
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance of corrugated plate heat exchanger using ethylene glycol as test fluid
Autorzy:
Sreedhar Rao, Battula
Keerthana Reddy, Chittireddy
Meena, Pullurwar
Kishore Kumar, Sriramoju
Powiązania:
https://bibliotekanauki.pl/articles/1819182.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
corrugated plate heat exchanger
overall heat transfer coefficient
effectiveness
Reynolds number
współczynnik przenikania ciepła
efektywność
liczba Reynoldsa
Opis:
This paper reports an experimental comparative thermal analysis of a flat plate heat exchanger and corrugated plate heat exchanger (CPHE) of different corrugation angles using ethylene glycol as test fluid. The experiments were carried out in counter current mode using water as hot fluid at 75°C. Design of each plate provided with eleven thermocouple sensors to determine the temperatures, in which seven were used to measure the surface temperature of plate and four were used to measure the inlet and outlet bulk temperature of cold and hot fluids. The mass flow rate of test fluid, varied between 0.5 to 4 liters per minute and corresponding steady state temperatures is measured. Using experimental readings, temperature difference between the inlet and outlet streams (∆T), logarithmic mean temperature difference (LMTD) and overall heat transfer coefficient (U) are determined. The obtained ∆T and U values of corrugation angles (30°, 50°) of CPHE were compared with those of flat plate heat exchangers. For corrugation angle of 30° and 50°, the ∆T and U values increases with increase of mass flow rate of the fluid. The turbulence in the flow increases due to increase in the corrugation angle, which results in the enhancement of heat transfer. Moreover, thermal effectiveness (ε) is estimated using NTU method and compared for all the plates. As the NRe values gradually increases, ε decreases for flat plate and CPHE (θ = 30° and θ= 50°). At low NRe value of 114, observed a maximum ε (≅0.998) value for corrugated angle of 50°. There is adequate contact time between the cold and hot fluids at low Reynolds number, so maximum rate of heat transfer is possible, as a result ε values are high.
Źródło:
Journal of Mechanical and Energy Engineering; 2020, 4, 2; 167--172
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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