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Cold Energy Utilization by Stirling Engine

Wiśniewski Krzysztof, Grzebielec Andrzej

Modern Engineering

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2020

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4

140--155

EN

Liquefied natural gas (LNG) will play an important role in the World, as evidenced by the constantly growing LNG market. One of its branches is the small-scale LNG market, which includes supplies to satellite gas networks, factories, or as fuel for car and bunker, fuel for vessels. LNG is mainly redistributed by trucks and then regassify in atmospheric air vaporizes (AAV), where the gas is heated by atmospheric air and the cold is thereby lost. Effective utilization of this energy, will allow the LNG technology to be more competitive, as well as to recover some of the energy lost in the liquefaction process. The purpose of this article is to explore the possibility of utilizing the cold energy from the LNG regasification process to drive a Stirling engine. For the aim of this analysis, an analytical method were used - Schmidt analysis, which assumes an isothermal processes of gas expansion and compression inside the engine, as well as excellent regenerator performance. Helium was used as a working factor. It was assumed, that the engine was arranged in accordance with alpha geometry. Average monthly air temperatures and average hourly temperatures for the coldest and warmest day of the year were applied to the model using macros and Excel worksheets. Those temperatures are the average from many years for Warsaw. Based on the applied data, the amount of regassified LNG, power of the entire system, indicated engine power, engine and system efficiency, as well as temperature in cylinders (and thus in heat exchangers) were calculated. The results showed the reasonability of using LNG as the lower heat source, and atmospheric air as the upper heat source. The system generates sufficient power, in all conditions, to meet the system energy consumption requirements i.e. fan. It produces significant excess amount of energy, which varies on the external conditions, i.e. the air temperature. In addition, the system meets the requirements for regassify amount of LNG at the end user.

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Material and design analysis of external baffles in inventory buildings with consideration of optimization of usable energy consumption

Wiśniewski Krzysztof, Witkowska-Dobrev Joanna

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2019

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Vol. 28, No. 4

557--568

EN

The main objective of the performed investigations was an analysis of baffles of various construction and production technology with respect of usable energy demand. The investigations encompassed calculations of the energetic performance of fatteners’ piggery building as well as heat and humidity calculations of baffles. The energetic calculations were performed for two variants of execution and heat insulation of external baffles as well as two variants of roofs. The analysis contained the baffles made in two technologies: industrialized and traditional modernized, for three climate zones. For the individual variants, the usable energy demand in heating season as well as specific usable energy demand per one fattener were calculated.

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Termomodernizacja sposobem rewitalizacji osiedli mieszkaniowych z wielkiej płyty

Dohojda Marek, Wiśniewski Krzysztof

Przegląd Budowlany

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2019

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R. 90, nr 9

47--50

PL

Prefabrykacja budownictwa mieszkalnego w Polsce stanowiła bardzo ważny etap rozwoju budownictwa mieszkalnego w ubiegłym wieku. Z racji zastosowania technologii prefabrykacji uprzemysłowionej została nazwana „wielką płytą”. Pomimo upływu czasu i wygaśnięcia okresu przewidywanej trwałości budynków wielkopłytowych (50 lat) obiekty w dużej większości są w dobrym lub bardzo dobrym stanie technicznym. Niewątpliwie zasługą tego stanu jest odpowiedni nadzór techniczny i zabiegi modernizacyjne i rewitalizacyjne. Zasadniczo na taki stan rzeczy miała wpływ termomodernizacja, która zapewniła większe oszczędności energii cieplnej w budynkach, jak i samo wykończenie powierzchni elewacji – nowe powłoki i często ciekawa kolorystyka.

EN

Prefabrication of residential construction industry in Poland constituted a very important stage in development of residential construction industry in the last century. Due to the use of technology of industrialized prefabrication, it has been called „large panel”. Despite the passage of time and the expiry of the period of expected durability of large panel buildings (50 years), the facilities in the vast majority are in good or very good technical condition. Undoubtedly, the merit of this condition has been appropriate technical supervision as well as modernization and revitalization practices. Basically, this state of affairs was influenced by thermo-modernization, which provided greater savings of thermal energy in buildings together with the finish of elevation surfaces, which were given a new coating and often interesting colours.