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2 Journal of New Technologies in Environmental Science

2 2020

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Innovative air conditioning system with rational distribution of thermal load

Radchenko Mykola I., Bohdal Tadeusz, Radchenko Andrii M., Trushliakov Eugeniy I., Labay Volodymyr Y., Tkachenko Veniamin S.

Journal of New Technologies in Environmental Science

2020

Vol. 4, nr 3

143--154

The efficiency of air conditioning (AC) systems depends on the operation of their air coolers at varying heat loads in response to current changeable climatic conditions. The intensity of heat transfer of refrigerant, evaporated inside air coils, drops at the final stage of evaporation, that is caused by drying out the inner wall surface. This results in lowering the overall heat transfer coefficient and reduction of air cooler efficiency in the whole. The concept of overfilling air coils that leads to excluding a dry-out of their inner surface and falling the overall heat transfer intensity at variation of refrigerant flows in response to change of current thermal load on air coolers is developed.

Gas turbine intake air cooling systems of combined type and their optimum designing

Radchenko Andrii M., Radchenko Mykola I., Mikielewicz Dariusz, Kosowski Krzysztof, Kantor Sergiy, Andreev Artem A.

Journal of New Technologies in Environmental Science

2020

Vol. 4, nr 2

51--64

Turbine intake air cooling (TIAC) by absorption lithium-bromide chillers (ACh) utilizing the exhaust heat is considered as the most effective fuel saving technology for temperate climatic conditions. But the cooling potential of TIAC systems based on ACh of a simple cycle is limited by a comparatively increased chilled water temperature of about 7°C excluding cooling intake air lower than 15°C. The application of a refrigerant as a coolant enables deeper cooling intake air to 10°C and lower. The application of two-stage hybrid absorption-ejector chillers (AECh) with a refrigerant ejector chiller (ECh) as a low temperature stage makes it possible to increase the annual fuel saving approximately twice in temperate climate due to deeper cooling air as compared with ACh. Furthermore, this effect can be achieved with the sizes of TIAC system reduced by about 20 % due to determining the rational refrigeration capacity of AECh providing practically maximum annual fuel saving increment and the use of the current excessive refrigeration capacities to cover peaked loads.