Wyniki wyszukiwania - Biblioteka Nauki

1

Experimental study on the adsorption refrigeration device built on a water-silica gel working pair

100%

Szelągowski A. , Trzcinkowski P.

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tom 1

42--54

EN

Due to increasing restriction put on compressor based cooling, adsorption cooling has been increasing its popularity. Abovementioned restrictions forces usage of ecological refrigerants, such as water. Additional advantage of adsorption devices is possibility to use low-grade waste heat source or solar energy as the main driving energy instead of electricity. This trend has lead to significant development of adsorption based branch in cooling industry over past 30 years. The paper presents the results of experimental research for an adsorption refrigeration device built of two deposits. Water-silica gel was chosen as the working pair, because this solution allows to work at the lowest drive temperatures. As a result of the experiment, EER coefficients were obtained at the level of 0.57-0.82 and SCP coefficients in the range from 8 to 21 W/kg. The results allow to conclude that adsorption devices can, in many cases compete with compressor solutions.

2

Cold storage in a sorption beds as an effective solution enabling averaging of daily energy consumption

100%

Grzebielec A. , Szelągowski A.

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2020

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tom Nr 4

70--74

EN

Energy storage is one of the most important issues related to modern energy. The major change from sources of constant generation energy into favor of sources with variable powers (wind or solar power plants) causes a greater than before need for energy storage systems. The article focuses on averaging energy consumption by air-conditioning installations in a single-family house. In a standard air conditioning system based on a compressor device, the demand for electric power is proportional to the demand for cooling power. If a cold store is used, it is possible to balance the electricity demand. The use of a cold storage in the form of a sorption bed means that the building uses a constant amount of electric energy just for ventilation system. The analysis showed that if there is needed to store 47.8 kWh of cold, its volume (in case it is built of silica gel) must be 3.78 m3. This solution not only causes that the energy consumption is equalized, but also significantly reduces electricity consumption.

PL

Magazynowanie energii jest jednym z ważniejszych zagadnień związanych ze współczesną energetyką. Odchodzenie od źródeł energii wytwórczych o stałej mocy na rzecz źródeł o zmiennych mocach (w elektrowniach wiatrowych czy słonecznych) powoduje większą niż do tej pory potrzebę magazynowania energii. W artykule skupiono się na uśrednianiu zużycia energii przez instalację klimatyzacji budynku jednorodzinnego. W standardowym układzie klimatyzacji opartym na urządzeniu sprężarkowym zapotrzebowanie na moc elektryczną jest proporcjonalne do zapotrzebowanie na moc chłodniczą. W przypadku gdy zastosuje się magazyn chłodu możliwe jest wyrównanie zapotrzebowana na energię elektryczną. Zastosowanie magazynu chłodu w postaci złoża sorpcyjnego powoduje, że budynek zużywa stałą ilość energii przez całą dobę na potrzeby wentylacji. Analiza pokazała, że w przypadku, gdy magazyn musi przechować 47,8 kWh chłodu jego objętość (w przypadku gdy jest zbudowany z silikażelu) musi wynieść 3,78 m3. Rozwiązanie to nie tylko powoduje, że zużycie energii jest równomierne, ale także zdecydowanie zmniejsza zużycie energii elektrycznej.

3

The Usage of Self-Regulating Steam Traps for Optimal Condensate Removal in Steam Pipelines

80%

Grzebielec A. , Szelągowski A. , Śmiechowicz M. , Stępień M.

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tom 1

24--32

EN

In energy-intensive systems, in which energy need to be transported through compact pipelines, steam is very often used as an energy carrier. The latent heat of steam condensation, surpassing its sensible heat, presents a distinctive advantage, resulting in steam pipelines requiring diameters significantly smaller compared to those needed for equivalent thermal power transmission. Nonetheless, the insulation of steam pipelines remains imperfect, resulting in inevitable heat dissipation. Consequently, this thermal loss leads to the condensation of water within the pipelines, necessitating the implementation of steam traps. The precise selection and implementation of suitable steam traps are essential for sustaining optimal pipeline functionality while minimizing energy losses. This research endeavors to comprehensively assess the criteria governing steam trap selection, focusing on their pivotal role in facilitating efficient pipeline operation. To achieve this objective, a mathematical analysis was conducted to quantify the volume of liquid generated within the pipeline due to condensation. Subsequently, an innovative self-regulating steam trap was introduced and evaluated to elucidate its efficiency in evacuating the accumulated liquid. Remarkably, the utilization of these advanced self-regulating steam traps yielded remarkably positive outcomes, profoundly enhancing pipeline performance and obviating steam losses. Through meticulous analysis of the mathematical model and empirical validation of the novel steam trap's functionality, this study not only contributes to enhancing the theoretical understanding of steam pipeline dynamics but also offers practical insights into optimizing their operational efficiency. This research showcases the potential of self-regulating steam traps to revolutionize steam pipeline dewatering practices, ensuring sustained energy transmission with minimal wastage and reaffirming their pivotal role in modern energy systems.