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001-es BibID:	BIBFORM125805
Első szerző:	Kostyák Attila (1990-)
Cím:	Assessment of the Actual and Required Cooling Demand for Buildings with Extensive Transparent Surfaces / Kostyák Attila, Szekeres Szabolcs, Csáky Imre
Dátum:	2024
ISSN:	1996-1073
Megjegyzések:	Energy consumption in buildings with large, glazed facades rises markedly in the summer, driven by cooling demands that vary with structural characteristics and external climate conditions. This study is unique in examining daily cooling needs in lightweight and heavyweight constructions, utilizing meteorological data from 782 summer days in Debrecen, Hungary. Unlike standard approaches, which often overlook localized meteorological variables, this analysis focuses on actual "clear sky" scenarios across distinct summer day types: normal, hot, and torrid. The findings indicate that orientation and construction type significantly affect cooling demands, with east-facing rooms demanding up to 14.2% more cooling in lightweight structures and up to 35.8% in heavyweight structures during peak hours (8 a.m. to 4 p.m.). This study reveals that for west-facing facades, extending use beyond 4 p.m. markedly increases energy loads. Furthermore, the cooling demand peak for heavyweight buildings occurs later in the day, driven by their higher thermal capacity. These insights underscore the importance of aligning HVAC system design with operational schedules and building orientation, offering data-driven strategies to enhance energy efficiency in buildings with diverse thermal and solar exposure profiles.
Tárgyszavak:	Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk operative temperature cooling demand hottest days global radiation
Megjelenés:	Energies. - 17 : 23 (2024), p. 1-19. -
További szerzők:	Szekeres Szabolcs (1982-) (Okleveles létesítménymérnök) Csáky Imre (1982-) (épületgépész mérnök)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM106150
035-os BibID:	(WOS)000908663400001 (Scopus)85145777219
Első szerző:	Kostyák Attila (1990-)
Cím:	Buffer Tank Discharge Strategies in the Case of a Centrifugal Water Chiller / Kostyák Attila, Béres Csaba, Szekeres Szabolcs, Csáky Imre
Dátum:	2023
ISSN:	1996-1073
Megjegyzések:	In this article, energy optimization of the cooling system of IKEA Budaörs is carried out. The cooling system is served by a centrifugal water chiller and includes a large-volume cooling buffer tank. The facility operates the hydraulic system of the buffer storage tank only during the transitional period. The main goal is to reduce energy consumption by changing the operating strategy of the existing system. To test the operating strategies, the operation and the thermal load of the shopping center during the summer season had to be simulated to find the best operation strategy. A hybrid method (real data and calculated values) was used in the simulation. The three operating scenarios examined show that the annual energy consumption and the number of operating hours of the chiller can be reduced by using the buffer tank with the right strategy. In the examined scenarios, a 30% energy improvement was achieved. The possibility of using a buffer tank is significantly limited by the fact that the heat exchangers were sized for low forward water temperatures. By re-sizing the heat exchangers, the utilization of the buffer tank could be considerably improved in conditions close to peak heat load.
Tárgyszavak:	Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk cooling centrifugal compressor buffer tank chiller heat exchanger
Megjelenés:	Energies. - 16 : 1 (2023), p. 1-15. -
További szerzők:	Béres Csaba (mérnök) Szekeres Szabolcs (1982-) (Okleveles létesítménymérnök) Csáky Imre (1982-) (épületgépész mérnök)
Pályázati támogatás:	TKP2021-NKTA-34 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: