Search results for: LOW GWP REFRIGERANTS

• Combined cold supply system for ship application based on low GWP refrigerants - Thermo-economic and ecological analyses

  Publication

  • J. Wajs
  • M. Mrózek
  • E. Fornalik-Wajs

  - ENERGY CONVERSION AND MANAGEMENT - Year 2022

  The withdrawal of popular high-GWP refrigerants will significantly affect maritime industry. Refrigeration and air conditioning systems currently used on ships are not ready to fulfil future limitations. Therefore, there is a need for system, which will operate with low-GWP refrigerants and at the same time will be efficient and reliable in difficult environmental conditions. This paper explains the concept of a cold supply system,...

  Full text available to download

• Performance of the very high-temperature heat pump with low GWP working fluids

  Publication

  • D. Mikielewicz
  • J. Wajs

  - ENERGY - Year 2019

  Traditional heat pumps are a very attractive pro-ecological solutions for a number of applications, including providing of heating or heat recovery from industrial processes. The application range of heat pumps could be greatly enlarged when the operating temperature would be increased to 130-150°C and/or the temperature lift can be increased to 50-100 K. In the paper, the very high temperature vapour-compressor based single stage...

  Full text to download in external service

• Jan Wajs dr hab. inż.

  People

  Zakład Ogrzewnictwa, Wentylacji, Klimatyzacji i Chłodnictwa, Institute of Energy

• The impact of environmentally friendly refrigerants on heat pump efficiency

  Publication

  • T. Muszyński
  • R. Andrzejczyk
  • B. Jakubowska

  - Journal of Power Technologies - Year 2019

  This paper discusses the issue of heat pump simulation. Lower operating costs can be achieved through good equipment design and appropriate operation. Detailed technical and economic analysis inform the selection of system components with the highest possible efficiency and lower energy demand. The use of systems based on environmentally friendly refrigerants can deliver long product life, which is associated with a shorter payback...

  Full text available to download

• Modelling of heat transfer during flow condensation of natural refrigerants under conditions of increased saturation pressure

  Publication

  • S. Głuch
  • D. Mikielewicz

  - Archives of Thermodynamics - Year 2024

  The paper presents a modified in-house model for calculating heat transfer coefficients during flow condensation, which can be applied to a variety of working fluids, but natural refrigerants in particular, at full range thermodynamic parameters with a particular focus on increased saturation pressure. The modified model is based on a strong physical basis, namely the hypothesis of analogy between the heat transfer coefficient...

  Full text available to download

• Marek Pszczoła dr hab. inż.

  People

  Department of Transportation Engineering

  I am a Faculty member (Department of Highway and Transportation Engineering) at the Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Poland). My main research interests include: low-temperature properties of asphalt mixtures, low temperature cracking assessment of pavement structures, road materials properties, thermal stress analysis, design of pavement structures, airfield design and analysis....

• Horizontal flow boiling of refrigerants inside porous coated tube.

  Publication

  • J. Cieśliński
  • B. Dawidowicz

  - Year 2005

  Przedstawiono wyniki badań przejmowania ciepła i spadku ciśnienia podczas wrzenia czynników chłodniczych R22, R134a i R407C w poziomej rurce z wewnętrzną powłoką porowatą.

• Wartość rezydualna w wycenach spółek notowanych na GWP w Warszawie.

  Publication

  • B. Prusak

  - Przedsiębiorstwo & Finanse - Year 2016

  Jednym z kluczowych elementów w procesie wyceny przedsiębiorstw stanowi kalkulacja wartości rezydualnej. W wielu przypadkach stanowi ona ponad 50% całkowitej wartości przedsiębiorstwa. Chociaż w literaturze przedmiotu są prezentowane różne koncepcje wyceny wartości rezydualnej to jednak brakuje kompleksowego podejścia. Dlatego też głównym celem opracowania jest krytyczna analiza metod wyceny wartości rezydualnej wraz z określeniem...

  Full text available to download

• Wpływ ekologicznych czynników roboczych na efektywność układu sprężarkowej pompy ciepła (The impact of environmentally friendly refrigerants on heat pump efficiency)

  Publication

  • T. Muszyński
  • R. Andrzejczyk
  • B. Jakubowska

  - Instal - Year 2016

  Artykuł poświęcony jest zagadnieniu symulacji pracy układu sprężarkowej pompy ciepła. Prawidłowe zaprojektowanie instalacji oraz jej właściwe użytkowanie pozwala na zmniejszenie kosztów eksploatacji. Dokładna analiza techniczno-ekonomiczna umożliwia natomiast dobór elementów systemu o możliwie największej sprawności, a zatem niskim zapotrzebowaniu na energię. Zastosowanie układów opartych o perspektywiczne, proekologiczne czynniki...

• The Medieval Low Countries

  Journals

  ISSN: 2295-3493

• Analysis of the selection of low temperature medium for a turbine power plant using ocean thermal energy (OTEC)

  Publication

  • D. Stępniak
  • M. Piwowarski

  - Year 2013

  The paper presents the results and conclusions of numerical calculations modelled in the EES program of a closed OTEC cycle. The following mediums were analysed: ammonia, R32, R41, R404a, R407c, R410a, R423a, R500, R502, R507a and R114, R152a, R234fa, R600, R1234yf, R1234ze. Analogous assumptions were adopted as in the ORC cycle with heat regeneration for dry refrigerants without regeneration for wet refrigerants. Each of them...

• Analysis of the selection of low-temperature medium for a turbine power plant using ocean thermal energy (OTEC)

  Publication

  • D. Stępniak
  • M. Piwowarski

  - Mechanics / AGH University of Science and Technology - Year 2013

  The paper presents the results and conclusions of numerical calculations modelled in the EES program of a closed OTEC cycle. The following mediums were analysed: ammonia, R32, R41, R404a, R407c, R410a, R423a, R500, R502, R507a and R114, R152a, R234fa, R600, R1234yf, R1234ze. Analogous assumptions were adopted as in the ORC cycle with heat regeneration for dry refrigerants without regeneration for wet refrigerants. Each of them...

• Low-coherence method of hematocrit measurement

  Publication

  • M. Szczerska
  • M. Gnyba
  • M. Kruczkowski

  - Year 2011

  During the last thirty years low-coherence measurement methods have gained popularity because of their unique advantages. Low-coherence interferometry, low-coherence reflectometry and low-coherence optical tomography offer resolution and dynamic range of measurement at the range of classical optical techniques. Moreover, they enable measurements of the absolute value of the optical path differences, which is still an unsolved problem...

  Full text to download in external service

• Flow Maps and Flow Patterns of R1233zd(E) in a Circular Minichannel at Low, Medium and High Values of Saturation Pressure

  Publication

  • S. Głuch
  • M. Pysz
  • D. Mikielewicz

  - Year 2023

  There is a gap in knowledge regarding the flow pattern of low-boiling working fluids in the range of high saturation temperatures (above 120°C) and medium and high reduced pressures (0.5-0.9). Data are present in the literature for similar values of reduced pressures, but for lower values of saturation temperature. This is due to the existing refrigeration applications of these working fluids. At high values of reduced pressure,...

  Full text available to download

• Journal of Low Power Electronics

  Journals

  ISSN: 1546-1998 , eISSN: 1546-2005

• Healthcare in Low-resource Settings

  Journals

  ISSN: 2281-7824

• International Journal of Low Radiation

  Journals

  ISSN: 1477-6545

• Early Modern Low Countries

  Journals

  eISSN: 2543-1587

• JOURNAL OF LOW TEMPERATURE PHYSICS

  Journals

  ISSN: 0022-2291 , eISSN: 1573-7357

• Low-Voltage Low-Power Filters with Independent ω0 and Q Tuning for Electronic Cochlea Applications

  Publication

  • W. Jendernalik
  • J. Jakusz
  • G. Blakiewicz

  - Electronics - Year 2022

  An acoustic second-order low-pass filter is proposed for filter banks emulating the operation of a human cochlea. By using a special filter structure and an innovative quality (Q)-factor tuning technique, an independent change of the cutoff frequency (ω0) and the Q-factor with unchanged gain at low frequencies is achieved in this filter. The techniques applied result in a simple filter design with low Q-factor sensitivity to component...

  Full text available to download

• Wpływ właściwości czynników chłodniczych na straty egzergii w pompie ciepła (Influence of Refrigerants Properties for Exergy Losses in Heat Pump)

  Publication

  • T. Muszyński
  • R. Andrzejczyk
  • B. Jakubowska

  - Ciepłownictwo, Ogrzewnictwo, Wentylacja - Year 2016

  Artykuł poświęcony jest wpływowi występujących w pompie ciepła strat egzergii na jej efektywność energetyczną, a co za tym idzie koszty funkcjonowania instalacji. Autorzy prezentują tu metodologię obliczeniową, która może być zastosowana w procesach projektowania układów cieplno-przepływowych. Obliczenia zostały wykonane na podstawie typowego układu powietrznej pompy ciepła pracującej w klimacie środkowo-europejskim. Ponadto w...

• LOW NOISE TIRES FOR HYBRID AND ELECTRIC VEHICLES

  Publication

  • J. Ejsmont
  • B. Świeczko-Żurek
  • S. Taryma

  - Year 2014

  Low Emission Vehicles that are hybrid and electric cars may benefit from specially designed tires that are optimized for driving conditions typical for such vehicles. It is possible that in the future Low Emission Vehicles, especially passenger cars, will substitute conventional vehicles in all applications, however for the time being they are mostly used in urban and suburban areas. Urban traffic has a rather low demand for grip...

• Endometrioid stromal sarcoma, low grade - Female, 74 - Tissue image [6180730013786841]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of CORPUS UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Endometrioid stromal sarcoma, low grade - Female, 74 - Tissue image [6180730013782931]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of CORPUS UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Endometrioid stromal sarcoma, low grade - Female, 74 - Tissue image [6180730013783131]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of CORPUS UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Endometrioid stromal sarcoma, low grade - Female, 74 - Tissue image [6180730013784491]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of CORPUS UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Endometrioid stromal sarcoma, low grade - Female, 74 - Tissue image [6180730013783241]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of CORPUS UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Mucinous cystic neoplasm with low grade dysplasia - Female, 40 - Tissue image [630073002825231]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Mucinous cystic neoplasm with low grade dysplasia - Female, 40 - Tissue image [7040247104932011]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Mucinous cystic neoplasm with low grade dysplasia - Female, 40 - Tissue image [6300730028253261]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Novel Low-Loss Substrates for 5G Applications

  Publication

  • K. Babicki
  • A. Lamęcki
  • M. Mrozowski
  • M. Baranowski
  • A. Wroblewska
  • M. Zdrojek
  • B. Salski
  • J. Krupka

  - Year 2022

  This paper presents a feasibility study of a new type of microwave low-loss dielectric substrates for 5G network applications. The new substrate materials are composites of polypropylene and high-dielectric-constant micro-ceramics. This combination is expected to form a very low-loss dielectric material at low fabrication cost. Two substrate samples with different dielectric properties are fabricated and their characteristics at...

  Full text to download in external service

• Voltage Conditions in Low Voltage Grid with Connected Mictogeneration

  Publication

  • R. Kowalak

  - Acta Energetica - Year 2017

  The introduction of distributed generation into a low voltage grid may cause voltage problems in it. The paper discusses the effect of microgeneration on voltage levels in a low voltage grid. A real low voltage grid of considerable length was selected for the analysis. The grid primarily supplies residential buildings in a rural area. Results of tests that consider potential measures which could be applied in this grid to improve...

  Full text available to download

• Low grade serous carcinoma - Female, 58 - Tissue image [10010729534339021]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of OVARY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Low grade serous carcinoma - Female, 58 - Tissue image [10010729534326341]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of OVARY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• The use of low-coherence interferometer for sugar content determination

  Publication

  • M. Szczerska

  - Year 2015

  In this article, the implementation of low-coherence interferometer with signal processing in time domain for sugar content determination in aqueous solution is presented. The elaborated measurement set-up was tested with the use of synthesized source made of two low-coherence sources. The use of two sources with dedicated parameters enabled to obtain a proper metrological parameters of the measurement system. The elaborated low-coherence...

  Full text to download in external service

• Multilocular cystic renal neoplasm of low malignant potential - Male, 42 - Tissue image [617073002674451]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of KIDNEY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Multilocular cystic renal neoplasm of low malignant potential - Male, 42 - Tissue image [6170730026743851]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of KIDNEY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Multilocular cystic renal neoplasm of low malignant potential - Male, 42 - Tissue image [6170730026749991]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of KIDNEY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Multilocular cystic renal neoplasm of low malignant potential - Male, 42 - Tissue image [6170730026745981]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of KIDNEY tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Evaluation of Low Temperature Properties of Rubberized Asphalt Mixtures

  Publication

  • M. Pszczoła
  • M. Jaczewski
  • C. Szydłowski
  • J. Judycki
  • B. Dołżycki

  - Procedia Engineering - Year 2017

  The paper presents low-temperature test results of asphalt mixtures designed with use of bitumen modified by crumb rubber and also SBS polymer. Laboratory tests were conducted on two types of asphalt mixtures for wearing course – stone matrix asphalt (SMA 8) and porous asphalt (PA 8). This paper presents results of the following laboratory tests at low temperatures: TSRST test, three point bending creep test, fracture toughness...

  Full text available to download

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [3300730069458321]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022694071]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022699761]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022694241]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022693501]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [3300730069455341]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022693991]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022694651]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Intraductal papillary mucinous neoplasm with low grade dysplasia - Male, 72 - Tissue image [11020630022696911]

  Open Research Data

  open access

  • Gdański Uniwersytet Medyczny

  This is the histopathological image of PANCREAS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format.

• Polynomial windows with low sidelobes’ level

  Publication

  • K. P. Okarma

  - SIGNAL PROCESSING - Year 2007

  Some of the main advantages of polynomial windows are their low computational complexity and ability to easily change their frequency response modifying the values of their coefficients in the time domain. Kulkarni presented the coefficients obtained for such windows with fastest possible decaying sidelobes...

  Full text to download in external service