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Wyświetlanie 1-15 z 1030
Tytuł:
„Smart project & building” – projektowanie budyków energooszczędnych w standardzie BIM
“Smart project & building” – BIM-standard design of energy efficient buildings
Autorzy:
Markiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/344741.pdf
Data publikacji:
2017
Wydawca:
Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Tematy:
model wirtualny budynku
BIM
model energetyczny
zintegrowane projektowanie energetyczne
wydajność energetyczna
entrance groups
built-in public service establishments
compositional structure
spatial structure
Opis:
Aktualnie powszechnie stosowane tradycyjne standardy projektowania architektoniczno-budowlanego powinny być radykalnie zmodyfikowane i dostosowane do współczesnych potrzeb. • SMART PROJECT – we współczesnym warsztacie architekta dokonuje się rewolucja informatyczna, związana z wprowadzaniem do powszechnego użytku nowych narzędzi wspomagających projektowanie w standardzie BIM, które umożliwiają budowę wirtualnego modelu budynku, połączonego z olbrzymią bazą danych, która parametryzuje wszystkie zastosowane materiały budowlane, technologie i wyposażenie techniczne budynku. Z wirtualnym projektem można powiązać parametry klimatyczne dla konkretnej lokalizacji geograficznej, a z drugiej strony parametry użytkowe dla poszczególnych pomieszczeń. • SMART BUILDING – w całym sektorze budownictwa radykalnie zwiększane są wymagania związane z energooszczędnością. W najbliższych latach ma to doprowadzić do osiągnięcia standardu tzw. „budynków nieomal zero-energetycznych”. Budynki o tak wysokiej efektywności energetycznej będą musiały być wyposażone w cały szereg innowacyjnych rozwiązań architektoniczno-budowlano-instalacyjnych, które znacznie się różnią od dotychczas stosowanych rozwiązań typowych.
The current, widely used traditional standards of architectural and construction design should be radically modified and adapted to modern needs. • SMART PROJECT – There is currently an information technology-based revolution happening in the modern architectural toolset, associated with introducing new BIM-standard digital design support tools into common use. These tools make it possible to create a virtual model of a building, linked to an immense database that parameterises all the implemented construction materials, technologies and building services of a building. The virtual design can be linked to climate parameters of a specific geographic location on the one hand, as well as occupancy parameters for each room on the other. • SMART BUILDING – Energy efficiency requirements are radically increasing across the entire construction sector. This is meant to lead to achieving the „near-zero energy building” standard in the next few years. Buildings that feature such a high energy effectiveness will have to include an entire array of innovative architectural, structural and building services solutions that significantly differ from the typical ones in use today.
Źródło:
Środowisko Mieszkaniowe; 2017, 21; 72-82
1731-2442
2543-8700
Pojawia się w:
Środowisko Mieszkaniowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A C++ shared-memory IPC framework for High-Throughput Data Acquisition systems
Autorzy:
Ingles, R.
Orlikowski, M.
Napieralski, A.
Powiązania:
https://bibliotekanauki.pl/articles/397736.pdf
Data publikacji:
2017
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
inter-process communication
ring buffer
data acquisition system
high-throughput
condition variables
futex
atomic variables
komunikacja międzyprocesowa
bufor pierścieniowy
system akwizycji danych
wysoka wydajność
zmienne warunku
zmienne atomowe
Opis:
High-Throughput Data Acquisition Systems are an essential part in many scientific experiments, and the processing of the large amount of data, represents a challenge in designing systems capable of managing such volume of data. Owing to the nature of this type of experiments, the processes responsible for gathering the data from devices that measure real-world phenomena, and those processes in charge of distributing the data to monitoring and/or controlling systems, shall communicate with accuracy and reliability. By running those processes concurrently in a multi-processor computer system, such requirements of accuracy and reliability can be achieved. In this paper, we present the design of a C++ framework, which implements a ring-buffer by using shared-memory as a fast mechanism of data communication among processes. Likewise, the framework controls the access to data in the shared ring-buffer by implementing inter-process synchronization objects in shared-memory. The effectiveness of the proposed solution has been evaluated by evaluating the latency time from when a new data is written into the shared ring-buffer and the longest instant when such a data is gathered. After the experimental test, the results show that it is possible to develop a C++ framework for helping programmers to create data acquisition system when a high-throughput data-stream is involved, getting suitable performance by using shared-memory.
Źródło:
International Journal of Microelectronics and Computer Science; 2017, 8, 2; 43-49
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Classification System for Characterization of Physical and Non-Physical Work Factors
Autorzy:
Genaidy, A.
Karwowski, W.
Succop, P.
Kwon, Y. G.
Alhemoud, A.
Goyal, D.
Powiązania:
https://bibliotekanauki.pl/articles/89768.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
performance
work-factor system
classification
klasyfikacja
system pracy
wydajność
Opis:
A comprehensive evaluation of work-related perfomance factors is a prerequisite to developing integrated and long-term solutions to workplace performance improvement. This paper describes a work-factor classification system that categorizes the entire domain of workplace factors impacting performance. A questionnaire-based instrument was developed to implement this classification system in industry. Fifty jobs were evaluated in 4 different service and manufacturing companies using the proposed questionnaire-based instrument. The reliability coefficients obtained from the analyzed jobs were considered good (.589 to .862). In general, the physical work factors resulted in higher reliability coefficients (.847 to .862) than non-physical work factors (.589 to .768).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 535-555
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study for double pass solar air collector utilizing medial glass panel
Autorzy:
Salih, Hussein M.
Powiązania:
https://bibliotekanauki.pl/articles/27309858.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
solar air collector
double-pass
CFD
finite volume
thermal performance
kolektor powietrza słonecznego
skończona objętość
wydajność cieplna
Opis:
A numerical investigation of thermal prediction of double-pass solar air heater of-counter flow is developed in the present study. The main idea of the current study is that the collector consists of two layers of glass so that the middle layer is glass instead of the usual metal plate. The performance of double-pass solar air heater is studied for a wide range of solar radiation intensities (600, 750 and 900 W/m 2). A FORTRAN-90 program is built to simulate the mathematical model of double-pass solar air heater based on solving steady state two-dimensional Navier-Stokes equations and energy equation based on finite volume method. Turbulence effect is simulated by two equations k-ε module. The results are compared with the results of a previous experimental study and a good agreement was found. From compression calculating efficiency of the present and traditional collector for each solar intensity, it was found that the efficiency of the current collector is higher than that of the traditional one, where the efficiency of the current collector at the solar intensity of (600, 750 and 900) W/m 2 are (0.529, 0.514 and 0.503), respectively, while those of the traditional collector (0.508, 0.492 and 0.481), respectively. In addition to this, the effect of the mass flow rate on the temperature difference of the current proposed collector was studied. Three values of the mass flow rate were studied (0.009,0.018, and 0.027) kg/s at solar intensity of 750 W/m 2. From this it was found that the temperature difference decreases with increasing mass flow rate. Accordingly, the efficiency decreases
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 4; 729--747
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of a single competitive strategy and a combination approach for enterprise performance
Studium porównawcze jednej strategii konkurencji i połączonego podejścia do wyników przedsiębiorstwa
Autorzy:
Mongkol, Kulachet
Powiązania:
https://bibliotekanauki.pl/articles/2149933.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska
Tematy:
strategia konkurencyjna
niski koszt
zróżnicowanie
strategie łączone
wydajność organizacji
competitive strategy
low-cost
differentiation
combined strategies
organizational performance
Opis:
Choosing the right competitive strategy helps a firm to compete with it rivals and become a leader in the market. Two different generic types of competitive strategies consisting of low-cost provider and differentiation have been wildly accepted by firms in every industry, but they are mutually exclusive and are not implemented at the same time. Nevertheless, contemporary studies agree that those two strategies can be combined, and firm should implement mutual strategies. Therefore, this research aims to examine the compatibility of a low-cost provider strategy and a differentiation strategy, and their impacts on organizational performance, considering various environmental factors. Methodologically, a quantitative approach was deployed using multiple regressions to analyze the responses from 42 CEOs in Thai public limited companies in eight different industries, which were classified in SET 100 index. The findings showed that combined strategies produced more significant impacts on the companies’ performance than a single strategy. Thus, firms may combine both low cost and differentiation strategies and implement them simultaneously. In addition, control variables (rapid change and uncertainty) and strategy variables appear to have significant impacts on companies’ performance. Therefore, firms should not ignore them to prevent negative consequences.
Wybranie odpowiedniej strategii konkurencyjnej pomaga firmie konkurować z rywalami i stać się liderem na rynku. Dwa różne rodzaje strategii konkurencyjnych składających się z taniego dostawcy i zróżnicowania zostały szeroko zaakceptowane przez firmy w każdej branży, ale wzajemnie się wykluczają i nie są wdrażane w tym samym czasie. Niemniej współczesne badania są zgodne, że te dwie strategie można łączyć, a firma powinna wdrażać strategie wzajemne. Dlatego niniejsze badanie ma na celu zbadanie zgodności strategii tanich dostawców ze strategią zróżnicowania oraz ich wpływu na wydajność organizacji, biorąc pod uwagę różne czynniki środowiskowe. Metodologicznie zastosowano podejście ilościowe przy użyciu regresji wielokrotnych do analizy odpowiedzi 42 dyrektorów generalnych tajlandzkich spółek akcyjnych w ośmiu różnych branżach, które zostały sklasyfikowane w indeksie SET 100. Wyniki pokazały, że połączone strategie wywarły większy wpływ na wyniki firm niż pojedyncza strategia. W ten sposób firmy mogą łączyć zarówno strategie niskokosztowe, jak i strategie różnicowania i wdrażać je jednocześnie. Ponadto zmienne kontrolne (szybka zmiana i niepewność) oraz zmienne strategiczne wydają się mieć znaczący wpływ na wyniki firm. Dlatego firmy nie powinny ich ignorować, aby zapobiec negatywnym konsekwencjom.
Źródło:
Polish Journal of Management Studies; 2021, 23, 2; 321--334
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of resultant corporate innovativeness assessment model
Autorzy:
Nawrocki, Tomasz L.
Powiązania:
https://bibliotekanauki.pl/articles/1879835.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
corporate innovativeness evaluation
innovativeness
financial performance
efficiency
ocena innowacyjności przedsiębiorstw
innowacyjność
wynik finansowy
wydajność
Opis:
Purpose: The main reason for developing the model was to fulfil the gap in the scope of synthetic/aggregate measure of corporate innovativeness in terms of company’s results in this area and their impact on its performance. Design/methodology/approach: In the proposed concept two aspects have been considered: quantitative and qualitative results of company’s innovation activity (i) and impact of this results on financial performance of company and its efficiency (ii). Due to the fact, that access to information on innovative activities results of companies is highly diversified, proposed model provides two versions to use: one, more general, based on public sources of data (Public Data Approach) and one, more detailed, based on data which should be collected through survey research (Survey Data Approach). The basis for corporate resultant innovativeness model creation was an assumption, that the ultimate market success of the company is not determined by how many innovative solutions it implements and introduces to the market and with what force it does it, but how these solutions will be accepted by the market and what economic benefits the company will receive due to them. Findings: Proposed methodology of innovativeness assessment gives a chance to eliminate several key shortcomings of the so far used methods and concepts of corporate innovativeness measurement and assessment. Research limitations/implications: Input data accessibility, development of knowledge (rules) bases needed to perform fuzzy inference. Practical implications: Presented model gives an opportunity to assess and compare enterprises in terms of their resultant innovativeness and then to assess the impact of this innovativeness on their performance. Social implications: Assessments generated by presented model can be basis for managerial decisions inside the assessed enterprise or investment decisions of investors in the capital market. Originality/value: Original approach for aggregate corporate resultant innovativeness assessment that eliminates several weaknesses of methods used so far.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 144; 363-372
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model of an energy efficient building automation system
Autorzy:
Horyński, M.
Pietrzyk, W.
Boguta, A.
Powiązania:
https://bibliotekanauki.pl/articles/410706.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
wydajność energetyczna
budynki inteligentne
systemy elektryczne
energy efficiency
programming
building system
intelligent building
electric system
Opis:
A good building is characterized by structural and installation flexibility. Its another important feature consists in adaptability i.e. in potential subdivisions and modification of the functions owing to the fact that the type of activity conducted in a building object may be changed in course of its service life. There are several market requirements to be met by a building. The basic requirements are: the profit for the owner and developer, effective use of available space, low maintenance costs and possibility to generate profits. It is possible to determine the principles of engineering (POE) for a building on the basis of an assessment of quality of the already existing buildings. The following quality categories are determined in the framework of this method: technical, functional, behavioural, organizational and economic category. The users of the building as well as their needs and location in the building and the needs of this building are further elements to be considered. The purpose of the present article is to establish a definition of an intelligent building and to present a model of building automation system in this type of building as well as to present the examples illustrating the use of computer in order to reduce electric energy consumption. The issues associated with the designing of energy efficient systems in the scope of building management have also been discussed.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 1; 41-45
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel DEA model for hospital performance evaluation based on the measurement of efficiency, effectiveness and productivity
Autorzy:
Ghahremanloo, Mohammad
Hasani, Aliakbar
Amiri, Maghsoud
Hashemi-Tabatabaei, Mohammad
Keshavarz-Ghorabaee, Mehdi
Ustinovičius, Leonas
Powiązania:
https://bibliotekanauki.pl/articles/125680.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
hospital performance evaluation (HPE)
Data Envelopment Analysis (DEA)
efficiency
effectiveness
productivity
ocena wydajności szpitala (HPE)
analiza danych otoczenia (DEA)
wydajność
skuteczność
produktywność
Opis:
Hospitals are the most important and costly component of the healthcare system. Therefore, hospital performance evaluation (HPE) is an important issue for the managers of these centres. This paper presents a new approach for HPE that can be used to calculate the efficiency, effectiveness, and productivity of hospitals simultaneously. Efficiency refers to the ratio of inputs and outputs, effectiveness refers to the extent to which outputs align with predetermined goals, and productivity refers to the sum of both efficiency and effectiveness. To this end, a Data Envelopment Analysis (DEA) model is developed to simultaneously measure the efficiency, effectiveness, and productivity (DEA-EEP) of hospitals. DEA is a linear programming technique that in its traditional form, calculates the performance of similar decisionmaking units (DMUs) that have both inputs and outputs. In this study, the inputs are the number of health workers, the number of other staff, and the number of patient beds; while the outputs are the bed occupancy rate and the bed turnover rate. A target value is set for each output to measure the effectiveness of hospitals. The advantage of the developed model is the ability to provide a solution for non-productive units so that they can improve their performance by changing their inputs and outputs. In the case study, data of 11 hospitals in Tehran were evaluated for a 3-year period. Based on the results, some hospitals experienced an upward trend in the period, but the efficiency, effectiveness, and productivity scores of most hospitals fluctuated and did not have a growing trend. This indicates that although most hospitals sought to improve the quality of their services, they needed to take more serious steps.
Źródło:
Engineering Management in Production and Services; 2020, 12, 1; 7-19
2543-6597
2543-912X
Pojawia się w:
Engineering Management in Production and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Performance Ranking of LGUs in Macedonia
Ranking wydajności działania jednostek samorządowych w Macedonii
Autorzy:
Kraja-Sejdini, Mirjana
Powiązania:
https://bibliotekanauki.pl/articles/646190.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
wydajność finansowa
wydajność samorządu lokalnego
wskaźnik samorządu lokalnego
Financial performance
local government performance
local government index
Opis:
Zagadnienie wydajności działania jednostek samorządowych w ramach sektora publicznego ostatnio cieszy się coraz większą popularnością, ponieważ samorządom powierza się coraz więcej zadań, wprowadzając jednocześnie ograniczenia budżetowe. Zarządzanie pieniędzmi podatników na tym poziomie staje się zatem coraz większym wyzwaniem. Z kolei coraz bardziej świadome społeczeństwo wywiera na samorządowcach presję, domagając się od nich większej odpowiedzialności i transparentności działań.Celem niniejszego opracowania jest ułatwienie – za pomocą przeanalizowania i znormalizowania wybranych wskaźników finansowych na poziomie lokalnym – władzom samorządowym stworzenia rankingu najbardziej i najmniej efektywnych jednostek samorządowych w Macedonii. Ustanowienie łatwo porównywalnego wskaźnika pozwoli na identyfikację sposobu wydatkowania środków oraz ustalenie, jakie dobre praktyki stosowane są w najbardziej wydajnych jednostkach. Czynnikiem ograniczającym możliwości badania okazała się słaba dostępność danych.Autorka ma nadzieję, że niniejsze opracowanie przyczyni się do zwiększenia zainteresowania opisywanym zagadnieniem badaczy z regionu bałkańskiego, którzy nie poświęcają mu wystarczajaco dużo uwagi. 
Local government performance within public sector performance is coming back because local government is faced with the problem of increased responsibilities under tighter budgets. Therefore, the issues of managing taxpayers’ money more efficiently and effectively still remain a challenge for local government decision makers. In addition, increased social inclusion has created a need for increased accountability and transparency towards local government managers.This paper aims to facilitate decision makers as well as local government officials to offer a ranking system of local government units (LGUs/municipalities) in Macedonia by analyzing and normalizing some of the main financial indicators that make up the final annual accounts of all LGUs in Macedonia. The output of this work is a local government index showing the best and worst performing municipalities in the country. The provision of one aspect of LG government performance allows all local government stakeholders to have an overview of the budget spent as well as identify some best practices by comparatively identifying the practices of the best performing LGUs. However, the data availability has narrowed the scope of this performance ranking.We hope that this study will contribute modestly to the existing literature of the performance in the public sector and specifically in that of the local government sector. There is an increasing interest in studies related to public sector performance. However, this interest has been very little in Balkan Countries.
Źródło:
Ekonomia Międzynarodowa; 2016, 15; 278-298
2082-4440
2300-6005
Pojawia się w:
Ekonomia Międzynarodowa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A relational database performance considerations for numerical simulation backend storage
Autorzy:
Nazdrowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/397730.pdf
Data publikacji:
2015
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
flat file
relational database
numerical methods
data management
performance
plik płaski
relacyjna baza danych
metody numeryczne
zarządzanie danymi
wydajność
Opis:
Problems of effective numerical calculations in scientific applications are caused by non-optimal front-end application code or ineffective system of scientific data management at back-end. In this article author presents some aspects of performance problems when relational database is used as backend storage based on real cases. Presented examples come from simulated environments with large load and many queries executed. These examples can reflect real problems with data processing in numerical calculations on data extracted from MSSQL Server database.
Źródło:
International Journal of Microelectronics and Computer Science; 2015, 6, 3; 71-78
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
Autorzy:
Skocilas, J.
Fort, I.
Jirout, T.
Powiązania:
https://bibliotekanauki.pl/articles/185244.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pitched blade impeller
erosion wear
ensemble-average mean velocity
impeller
pumping capacity
CFD simulation
prędkość uśredniona
wirnik
wydajność pompy
symulacji CFD
Opis:
This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
Źródło:
Chemical and Process Engineering; 2013, 34, 1; 39-49
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
Autorzy:
Krzywanski, Jarosław
Sztekler, Karol
Bugaj, Marcin
Kalawa, Wojciech
Grabowska, Karolina
Chaja, Patryk Robert
Sosnowski, Marcin
Nowak, Wojciech
Mika, Łukasz
Bykuć, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2128167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorption heat pump
polygeneration
cooling capacity
low grade thermal energy
artificial neural networks
soft computing
absorpcyjna pompa ciepła
poligeneracja
wydajność chłodnicza
energia cieplna niskiej jakości
sztuczne sieci neuronowe
przetwarzanie miękkie
Opis:
Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137054, 1--11
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
Autorzy:
Krzywanski, Jarosław
Sztekler, Karol
Bugaj, Marcin
Kalawa, Wojciech
Grabowska, Karolina
Chaja, Patryk Robert
Sosnowski, Marcin
Nowak, Wojciech
Mika, Łukasz
Bykuć, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2173577.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorption heat pump
polygeneration
cooling capacity
low grade thermal energy
artificial neural networks
soft computing
absorpcyjna pompa ciepła
poligeneracja
wydajność chłodnicza
energia cieplna niskiej jakości
sztuczne sieci neuronowe
przetwarzanie miękkie
Opis:
Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137054
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agricultural knowledge transfer: A case study for small farms and young farmers’ beneficiaries of European funds
Autorzy:
Popescu, Gheorghe Cristian
Powiązania:
https://bibliotekanauki.pl/articles/111968.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
knowledge
European funds
productivity
young farmers
training
fundusze europejskie
fundusz europejski
wydajność
polityka rolna
trening
transfer wiedzy
Opis:
Common Agricultural Policy represents the main instrument of the European Union for the development of agriculture and rural areas. European funds are vital for the productivity and competitive-ness of agricultural holdings, as well as for the transfer of agricultural knowledge and innovation. Supporting small and young farms is essential for the vitality of rural areas and for the renewal of generations of farmers. The aim of this work is to transfer agricultural knowledge in order to improve the productivity of agricultural holdings, especially among young farmers and small farms. We implemented training program through European funds related to Measure 1. "Actions for knowledge transfer and information actions" from Rural Development Programme of Romania. The characteristic of 100 participants and their responses were analyzed. Most of the participants were young people up to 40 years old (59%). The vast majority of the participants were from the rural area and only 17% were from the urban area. 53% from participants were strongly agree with the fact that level of knowlegde influence farm productivity. Actions for knowledge transfer improve the adaptation of farmers to the new challenges of agriculture, as well as productivity.
Źródło:
Production Engineering Archives; 2019, 25; 17-20
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agricultural production factors structures in selected EU-15 countries and Poland. Similarities and differences
Rolnicze struktury wytwórcze wybranych krajów UE-15 i Polski. Podobieństwa i różnice
Autorzy:
Czyżewski, Andrzej
Staniszewski, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/952350.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
production factors structures
agriculture
labor
productivity
land productivity
comparative analysis
struktury wytwórcze
rolnictwo
wydajność pracy
produktywność ziemi
analiza porównawcza
Opis:
This article, applying methods of statistical analysis of the structure and the Lorenz curve, compares the distribution of labor and land between farms of various size in Poland and the most similar in terms of agricultural production structures EU-15 countries – Germany, France and Denmark. Analysis of data from 2013 leads to the conclusion that the biggest discrepancy between countries occurs is labor factor, which excessive use is characteristic for Poland. The situation looks much better in terms of land productivity. In the case of agricultural structures, in Poland, they are in relative terms similar to the structures of the other analyzed countries. However, Polish farms are absolutely much considerably smaller. Finally, formulating recommendations for the Polish agriculture restructuration, it must first focus on the relocation of the resources of labor factor out of agriculture. Although, these type of changes will certainly not be neutral for the agrarian structure.
Stosując metody statystycznej analizy struktury oraz krzywą Lorenza, w pracy porównano rozkład czynnika pracy i ziemi w gospodarstwach o różnym rozmiarze w Polsce i najbardziej podobnych pod względem struktur produkcji rolnej krajach UE-15 – Niemczech, Francji i Danii. Analiza, przeprowadzona na danych pochodzących z 2013 roku, prowadzi do wniosków, że największa rozbieżność pomiędzy państwami dotyczy czynnika pracy, którego nadmiernym wykorzystaniem cechuje się głównie Polska. Dużo lepiej wypada ona na tle pozostałych badanych krajów w zakresie produktywności ziemi. Struktury agrarne w Polsce są – w ujęciu względnym – podobne do struktur porównywanych państw. Bezwzględnie jednak gospodarstwa polskie są wyraźnie mniejsze. Ostatecznie, formułując zalecenia dla restrukturyzacji polskiego rolnictwa, należy w pierwszej kolejności skupić się na relokacji zasobów czynnika pracy poza sektor rolny, choć z pewnością tego typu zmiany nie będą neutralne dla struktury agrarnej.
Źródło:
Journal of Agribusiness and Rural Development; 2017, 44, 2; 295-304
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1030

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