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Wysokoefektywna jednostka klimatyzacyjna do obiektów wielkopowierzchniowych

Pacak Anna, Cichoń Aleksandra, Drąg Paweł, Pandelidis Demis

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2021

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T. 52, nr 5

15--21

PL

Obecnie poszukuje się alternatywnych rozwiązań tradycyjnych systemów klimatyzacyjnych, które pozwalają na obniżenie zużycia energii w budynkach. W niniejszym artykule przedstawiono postęp w opracowaniu prototypu wysokoefektywnej jednostki wentylacyjno-klimatyzacyjnej dla umiarkowanego i wilgotnego klimatu, wykorzystującej koncepcję wymienników wyparnych z tzw. chłodzeniem punktu rosy. Jest to możliwe dzięki technologii chłodzenia wyparnego stosowanego do zwiększenia efektywności osuszania powietrza. W celu zaprojektowania odpowiedniego urządzenia przeprowadzono szereg testów materiałów porowatych, które są wykorzystane do budowy wymiennika. Koncepcja została zweryfikowana z wykorzystaniem metod modelowania numerycznego oraz przeprowadzono wstępne badania eksperymentalne, które potwierdziły słuszność założeń. Jednostka może być również wykorzystana jako element dodatkowy w systemach klimatyzacyjnych obniżający zużycie energii elektrycznej przez sprężarkowe systemy chłodnicze.

EN

Currently, alternative solutions to traditional air-conditioning systems that reduce energy consumption in buildings are being searched for. This paper presents the progress in the development of a prototype of a highly efficient ventilation and air conditioning unit for moderate and humid climate, based on the concept of evaporative exchangers from the so-called dew point cooling. This is possible due to dedicated, evaporative cooling technology used to increase the efficiency of air dehumidification. In order to design a suitable device, a number of tests of porous materials were carried out, which are used to build the evaporative cooler. The concept was verified with the use of numerical modeling methods and preliminary experimental studies were carried out, which confirmed the correctness of the assumptions. The unit can also be used as an accessory for air conditioning systems to reduce the electricity consumption of compressor refrigeration systems.

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A Shortened Time Horizon Approach for Optimization with Differential-Algebraic Constraints

Drąg Paweł

Annals of Computer Science and Information Systems

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2021

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Vol. 25

211--215

EN

In this work a new numerical optimization scheme based on a shortened time horizon approach was designed. The shortened time horizon strategy has never been presented or tested numerically. The new methodology was applied for a single objective optimization task subject to a system of nonlinear differential-algebraic constraints, which can take a form of differential-algebraic equations (DAEs). Moreover, it was assumed, that an application of a cooperated multiple shooting with direct solution method, like direct shooting approach, does not enable us to solve the DAE system, even on relatively small subintervals. Therefore, the new solution procedure is based on two main parts: i) designing of an alternative differentialalgebraic constraints, ii) parametrization of a new constraints system by the multiple shooting approach and further simulation of the alternative system independently on small subintervals. Then, the simulation interval can be modified by the shortened time horizon approach. The presented algorithm was used to solve a highly nonlinear optimization task of a fed-batch reactor operation.

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A new optimization-based approach for aircraft landing in the presence of windshear

Drąg Paweł, Styczeń Krystyn

Annals of Computer Science and Information Systems

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2017

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Vol. 13

83--88

EN

In the article a new approach for aircraft landing with the presence of the windshear phenomena was presented. The differential-algebraic model with variability constraints was under considerations. To transform the optimal control problem into a nonlinear optimization task, a modified direct shooting method was used. Then, to solve the obtained large-scale nonlinear optimization problem, a barrier method was applied. Moreover, in the proposed optimization-based approach, the variability constraints imposed on the state trajectory were considered directly.