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Wyświetlanie 1-15 z 97
Tytuł:
Energy efficiency of ground heat exchangers co-operating with a compressor heat pump
Efektywnosc energetyczna wymiennikow gruntowych wspolpracujacych ze sprezarkowa pompa ciepla
Autorzy:
Kurpaska, S.
Latala, H.
Powiązania:
https://bibliotekanauki.pl/articles/792483.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
compressor heat pump
heat exchanger
horizontal exchanger
vertical exchanger
ground heat exchanger
coefficient performance
statistical analysis
energy efficiency
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficiency of ground heat exchangers co-operating with a compressor heat pump
Efektywnosc energetyczna wymiennikow gruntowych wspolpracujacych ze sprezarkowa pompa ciepla
Autorzy:
Kurpaska, S.
Latala, H.
Powiązania:
https://bibliotekanauki.pl/articles/793577.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
heat pump
compressor heat pump
heat exchanger
horizontal exchanger
vertical exchanger
coefficient performance
statistical analysis
variance analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on efficiency of heat recovery in the cross-plate heat exchanger made of plastic
Autorzy:
Sas, S.
Kasprzyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/88926.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
heat exchanger
heat recovery
Opis:
The article content the results of study of heat exchanger. Exchanger was made of plastic material: polystyrene. The measurement results were used for efficiency analysis of this type of heat exchanger as an alternative to the commonly used heat exchangers made of aluminum.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 151-159
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novye shemy i osobennosti rabocego processa gazoturbinnyh dvigatelej na baze kaskadnogo obmennika davleniem
New patterns and peculiarities of the gas turbine working process on the base of cascade pressure exchanger
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359115.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The paper describes the main directions of gas turbines improvement in terms of application of the cascade pressure exchange rules for air compression in the machine�fs working cycle. The final calculation results of the four variants of the working process organization on the base of the two-stage gas turbine compression unit with inter-cooling and heating of the gas medium are presented. Opportunities and provision of energy efficiency increase of cascade pressure exchange gas turbine by increasing the maximum temperature of the circulation and recirculation of waste heat gas compression are shown.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 17-25
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motematiceskaa model rabocego processa vozdusnoi holodilnoi masiny kaskadnogo obmena davleniem refriseratornyh sekcij morskogo transporta
Mathematical model of the working process of cascade pressure exchange air cooling machine of refrigeration section in maritime transport
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359118.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The article presents a mathematical model for determining the base regimes for common work of air cooling machine’s units with cascade pressure exchanger which allows to specify the device performance and thermal energy expenses. The final results of modeling and recommendations for the area of application are described.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 12-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the steam flow field in shell and tube heat exchanger
Autorzy:
Bartoszewicz, J.
Bogusławski, L.
Powiązania:
https://bibliotekanauki.pl/articles/240429.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
heat exchanger
shell and tube heat exchanger
przenikanie ciepła
wymiennik ciepła
wymiennik płaszczowo-rurowy
Opis:
In the paper, the results of numerical simulations of the steam flow in a shell and tube heat exchanger are presented. The efficiency of different models of turbulence was tested. In numerical calculations the following turbulence models were used: k-ε, RNG k-ε, Wilcox k-ω, Chen-Kim k-ε, and Lam-Bremhorst k-ε. Numerical analysis of the steam flow was carried out assuming that the flow at the inlet section of the heat exchanger were divided into three parts. The angle of steam flow at inlet section was determined individually in order to obtain the best configuration of entry vanes and hence improve the heat exchanger construction. Results of numerical studies were verified experimentally for a real heat exchanger. The modification of the inlet flow direction according to theoretical considerations causes the increase of thermal power of a heat exchanger of about 14%.
Źródło:
Archives of Thermodynamics; 2016, 37, 2; 107-120
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Cyclic Corrosion Tests in Automotive Industry
Autorzy:
Biało, Ł.
Grodniewicz, T.
Żabiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/354042.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion test
automotive
aluminum
heat exchanger
corrosion products
Opis:
Corrosion is a main problem for longtime exploration of heat exchangers in automotive industry. Proper selection of accelerated corrosion test for newly developed material is a key aspect for aluminum industry. The selection of material based on corrosion test includes test duration, chemical spray composition, temperature and number of cycles. The paper present comparison of old and newly developed accelerated corrosion tests for testing automotive heat exchanger. The accelerated test results are comprised with heat exchanger taken from market after life cycle.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1469-1476
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eco-innovative method of cleaning heat exchangers from boiler scale
Autorzy:
Olczak, Piotr
Kowalski, Zygmunt
Kulczycka, Joanna
Makara, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/406832.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
chemical treatment method
eco-innovative
boiler
Opis:
The operation of thermal devices and installations, in particular heat exchangers, is associated with the formation of various deposits of sediments, forming the boiler scale. The amount of precipitate depends on the quality of the flowing liquids treatment, as well as the intensity of the use of devices. There are both mechanical and chemical treatment methods to remove these deposits. The chemical methods of boiler scale treatment include the cleaning method consisting in dissolving boiler scale inside heat devices. Worked out descaling concentrate contains phosphoric acid (V) and the components that inhibit corrosion, anti-foam substances, as well as anti-microbial substances as formalin, ammonium chloride, copper sulphate and zinc sulfate. Dissolution of the boiler scale results in the formation of wastewater which can be totally utilized as raw materials in phosphoric fertilizer production. As a result, both the preparation produced and its use are entirely free from waste.
Źródło:
Management and Production Engineering Review; 2020, 11, 1; 23--30
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Fin Shape on Heat Transfer in Coil and Fin type Evaporator
Autorzy:
Prokopowicz, Mateusz
Grzebielec, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/24202385.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
evaporator
fins
heat exchanger
parownik
żebra
wymiennik ciepła
Opis:
The aim of the study is to investigate the influence of external fins on heat transfer in the evaporator. The scope in which the analysis was performed is to check how the capacity of the exchanger is affected by the change of individual elements of the fin geometry. The introduction describes the current state of knowledge about evaporators. One of the subchapters is entirely devoted to the phenomenon of frosting evaporators, which is unfavourable from the point of view of heat transfer. The subsection also describes how to minimize the occurrence of this phenomenon. The next chapter presents mathematical models of heat transfer coefficients during boiling of inorganic refrigerants in horizontal pipes and during the flow of a bundle of smooth and air-fined pipes. On the basis of correlations and mathematical dependencies contained in this chapter, analyses of the influence of individual factors on heat transfer in the evaporator were performed. The next chapter contains the analysis methodology, it contains drawings of modeled heat exchangers. The penultimate chapter contains the results of the analyses with graphs and descriptions, detailing the most important differences between the individual evaporator geometries. The last chapter is a summary and conclusions about the effect of fins on heat transfer in the evaporator.
Źródło:
Modern Engineering; 2021, 4; 1--12
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the impact of construction solutions on operating parameters of the internal heat exchanger with refrigerant R744
Autorzy:
Janus, Jakub
Skotniczy, Przemysław Jan
Richert, Maria
Powiązania:
https://bibliotekanauki.pl/articles/240370.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
internal heat exchanger
cooling efficiency
numerical fluid mechanics
wymiennik ciepła
wewnętrzny wymiennik ciepła
efektywność chłodzenia
numeryczna mechanika płynów
Opis:
Work on increasing the efficiency of heat exchangers used in car air conditioning systems may lead to a partial change in the construction of refrigeration systems. One of such changes is the use of smaller gas coolers, which directly translates into a reduction in the production costs of the entire system. The article presents the use of computational fluid dynamics methods to simulate the impact of changing the shape of an internal heat exchanger on the cooling efficiency with R744 as the refrigerant. Internal heat exchangers with different geometry of the outer channels were subjected to numerical analysis. The obtained results of calculations show temperature changes in inner and outer channels on the length of the heat exchanger.
Źródło:
Archives of Thermodynamics; 2019, 40, 1; 145-160
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model and measurements of a combi-steamer condensation hood
Autorzy:
Tokarski, Mieszko
Ryfa, Arkadiusz
Buliński, Piotr
Rojczyk, Marek
Ziarko, Krzysztof
Nowak, Andrzej J.
Powiązania:
https://bibliotekanauki.pl/articles/240444.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy balance
heat transfer
heat exchanger
condensation
condensation hood
Opis:
Combi-steamer condensation hoods are widely used in modern gastronomy. They condense steam produced by the combi-steamer and also filter solid particles, moisture, grease and smells. All these factors negatively affect the staff and dishes, so efficient work of the condensation hoods becomes important. A mathematical and experimental analysis of such a device is described in this paper. First a measurement methodology was designed and measurements of air humidity, temperature and mass flow rates were performed. The measurement procedure concerned dedicated a steam generator and combi-steamer. Next a mathematical model was developed. It was based on mass and energy balances of the condensation hood. The condensate flow rate turned out to be insufficient to fulfill the energy balance while measured directly. Hence, it was calculated from heater’s power of the steam generator and the balance model was validated. The combisteamer had an unknown output, so the condensate flow rate was provided by the balance model after its validation. A preliminary diagnosis of the device was carried out as well.
Źródło:
Archives of Thermodynamics; 2020, 41, 1; 125-149
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika wymienników ciepła i niestabilności w obiegu ORC
The dynamics of heat exchangers and instabilities in ORC circulation
Autorzy:
Mikielewicz, J.
Mikielewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1819596.pdf
Data publikacji:
2011
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
wymiennik ciepła
ORC
niestabilność przepływu
heat exchanger
flow instability
Opis:
Z zagadnieniami odparowania czynników niskowrzących w parowniku mikrosiłowni związane są zagadnienia dynamiki i stabilności hydrodynamiczno-termicznej kanału rekuperatora-parownika, jak też i parownika pary jako całości [1÷4]. Niestabilność przepływu dwufazowego w kanale, w którym odparowuje czynnik wiąże się z wystąpieniem wahań ciśnienia i natężenia przepływu. Zbyt duże wahania ciśnienia są groźne. Mogą powodować deformację ścianek kanału, a w konsekwencji i awarię parownika. Towarzyszące pulsacjom ciśnienia, zmiany natężenia przepływu, mogą z kolei powodować kryzysy form wrzenia, co w rezultacie powoduje obniżenie efektywności wymiany ciepła w rekuperatorze. Niestabilność przepływu pary produkowanej przez parownik może prowadzić do niestabilnej pracy turbiny pracującej na ten czynnik. Stąd też zagadnienie stabilności lokalnej (przepływu w kanale, w którym odparowuje czynnik) jak i ogólnej parownika jako całości, jest ważne dla projektantów parowników mikrosiłowni. Zagadnienie stabilności przepływu dwufazowego w kanale odparowującym czynnik było analizowane w literaturze przedmiotu w aspekcie kotłów parowych. Analiza opierała się o badania charakterystyki hydraulicznej kanału. Stwierdzono, że przyczyną niestabilności przepływu w kanale jest niejednoznaczność charakterystyki spadku ciśnienia w kanale w zależności od zmian natężenia przepływu. Początkowo sądzono, że wystarczy usunąć tę niejednoznaczność, aby zapewnić stabilny przepływ, jednakże jak wykazały późniejsze badania eksperymentalne, tą drogą nie uniknie się niestabilności przepływu typu periodycznego [1÷4]. Niemniej wydaje się, że wstępne rozpatrzenie charakterystyki hydraulicznej kanału będącej źródłem niestabilności, ze względu na prostotę zagadnienia jest uzasadnionym. Takie badanie jest proste i w przypadku stwierdzenia niejednoznaczności charakterystyki hydraulicznej kanału, pozwala na uniknięcie pracochłonnego badania dynamiki układu. Proces wrzenia w przepływie jest złożony. Występuje w nim szereg skomplikowanych zjawisk. Równania dynamiki, jak też i własności czynnika są silnie nieliniowe. W pracy przedstawiono prosty hydrauliczny model pozwalający na analizę niestabilności przepływu. Model taki może służyć do zaprojektowania układu regulacji w mikrosiłowni ORC.
Instability of the twophase flow in a channel where the fluid evaporates is related to occurrence of pressure and flow rate variations. Too excessive variations of pressure may be dangerous as they can lead to deformation of channel walls and in consequence to the breakdown of the evaporator. Changes of mass flow rate, which accompany the pressure pulsations can, on the other hand, lead to boiling crisis, which would reflect in reduced rates of heat exchange in the evaporator. Instabilities of produced in evaporator can lead also to the unstable operation of turbine. Therefore the issue of local and overall stability is of significant importance to the designers of micro CHP systems. The issue of stability of two-phase flow in a channel where reagent evaporates was analyzed in the literature in terms of steam boilers. The analysis was based on studies of hydraulic characteristics of the channel. It was found that the cause of instability of flow in channel is the ambiguity of the characteristics of pressure drop in the channel, depending on changes in flow rate. Initially it was thought that removal this ambiguity would ensure that the flow is stable, however, later experimental studies showed, periodic flow instability cannot be avoided this way. The process of boiling in the flow is complex. It includes a number of complex phenomena. The equations of dynamics, as well as medium properties are highly nonlinear. The paper presents a simple hydraulic model enabling analysis of the system stability and propagation of disturbances induced by a step change of the flow rate. The proposed model can serve in design of the system of control of micro heat exchangers of the micro CHP. The works on implementation of the algorithm and control of operation of the real system are underway.
Źródło:
Rocznik Ochrona Środowiska; 2011, Tom 13; 393-407
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of a radiated heat exchanger surface on heat transfer
Autorzy:
Morel, S.
Powiązania:
https://bibliotekanauki.pl/articles/240062.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
reciprocal emissivity coefficient
wymiennik ciepła
współczynnik emisyjności
Opis:
The experiment leads to establish the influence of radiated surface development heat exchangers on the values of heat flux transferred with water flowing through the exchangers and placed in electric furnace chamber. The values of emissivity coefficients are given for the investigated metal and ceramic coatings. Analytical calculations have been made for the effect of the heating medium (flame) – uncoated wall and then heating medium (flame) – coated wall reciprocal emissivity coefficients. Analysis of the values of exchanged heat flux were also realized. Based on the measurement results for the base coating properties, these most suitable for spraying the walls of furnaces and heat exchangers were selected, and determined by the intensification of heat exchange effect. These coatings were used to spray the walls of a laboratory waste-heat boiler, and then measurements of fluxes of heat absorbed by the cooling water flowing through the boiler tubes covered with different type coatings were made. Laboratory tests and calculations were also confirmed by the results of full-scale operation on the metallurgical equipment.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 161-174
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of ultrasonic cleaning for shipborne heat exchangers: Construction, numerical simulation, and verification
Autorzy:
Buse, Hauke
Spangemacher, Lars
Fröhlich, Siegmund
Powiązania:
https://bibliotekanauki.pl/articles/24202542.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ultrasonic
cleaning
heat exchanger
pipe bundle
micro-cavitation
simulation
Opis:
The current article describes the basics and prospects of the ultrasound-assisted cleaning of shell and tube heat exchangers that are used, e.g., on ships. A main issue of seawater heat exchangers is their clogging. After a certain operating time, the fouling process (barnacles, algae, etc.) starts, which results in a decreased performance that produces a noticeably reduced flow rate and a declining transmission of heat energy. Based on the current state of the art, heat exchangers are cleaned by mechanical or chemical (CIP, cleaning in place) methods. Especially on ship-based systems, a mechanical cleaning in very narrow spaces can be difficult and the usage of chemicals for CIP may generally be prohibited. An ultrasound-assisted cleaning would significantly save time and manning. Based on previous experiments, a test reactor represented by a shell and tube heat exchanger with ultrasound-assisted cleaning has been designed. A FEM (finite element method) simulation is performed to provide information about the ultrasound power distribution inside the reactor. Further, the assembly and commissioning of the test reactor with associated comparative measurements were carried out, which are also reported here.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 71 (143); 41--47
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feasibility of using heat-recovery exchangers in livestock buildings at a site at a specific altitude with a specific average outdoor air temperature
Autorzy:
Sleger, V.
Neuberger, P.
Polak, M.
Powiązania:
https://bibliotekanauki.pl/articles/62353.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
feasibility
heat-recovery exchanger
livestock building
outdoor air temperature
climate condition
Czech Republic
agriculture
air temperature
weather station
ventilation
air exchange
heat exchanger
Opis:
The installation of an energy-saving facility must be preceded by analysis of its financial effectiveness. Among methods enabling such evaluation is the basic net profit calculation method. For this, the annual consumption of electricity for ventilation or of thermal energy for heating must be determined. The calculation formula uses the sum of energies for temperatures within the range from the calculation temperature for the area in question to the long-term average of the maximum temperature at the site, or to the temperature at which the heating power is zero. It is necessary to know the summary time of occurrence of a given temperature during a year. The site data can only be assessed based on long-term meteorological information. In fact, data used by current national standards to describe climatic conditions in the Czech Republic are from the years 1901 to 1950. The dependence of the average yearly temperature on altitude is shown in Fig. 1 for the 1961 1990 and 1991 2000 periods. It is evident that the average temperatures for the latter period are nearly 0.6 K higher than those for the former period, irrespective of the altitude. In this paper the climatic conditions are assessed based on daily data measured throughout the period from 1 January 1991 to 31 December 2000. Weather stations were selected so as to achieve a uniform coverage and continuity of measurement at each site (as far as possible). All the stations lie in the Czech Republic between 48.8° and 50.8° north latitude at altitudes from 158 m to 1324 m. It was the objective of this examination, based on the meteorological data collected to calculate the average number of days and hours during which the temperature during the year is lower than a specific limiting level, in dependence on the average yearly temperature of the site. Fig. 3 shows the average number of days in a year during which a temperature lower than a selected limiting level occurs, as calculated for the 1991 2000 period. The results are presented for 4 areas with average yearly temperatures of 6 °C 7 °C, 7 °C 8 °C, 8 °C 9 °C, and 9 °C 10 °C, respectively. The graphs enables us to ascertain the number of days during which a heating facility is in operation if the facility is activated by outdoor air temperature decrease to below a specific limiting level. If a typical daily temperature wave is considered, the method makes it possible to estimate the number of hours during which the air temperature is lower than the limiting level chosen. The difference between the data for various limiting levels allows us, for an area with a specific average yearly temperature to ascertain the time of occurrence of outdoor temperature within various ranges. The results of calculations are shown in Fig. 4 and Table 1. The method applied enables underlying data to be prepared for the assessment of energy demands for air heating at a given site and for estimation of the energy savings that could be achieved by installing economical air heating facilities in livestock buildings.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 97

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