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Zvečanje učinkovitosti krovnega procesa z zvišanjem tlačnega nivoja uparjanja
Cerkvenik, Boštjan (Author), Poredoš, Alojz (Author), Ziegler, Felix (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-IQDAQ5DF This link opens in a new window

Abstract
Zahteve po klimatizaciji poslopij so iz leta v leto večje. Ponavadi se za pripravo hladu uporabljajo kompresorske hladilne naprave, za katere je značilna zgoščenost in ugodne cene. Sorpcijske hladilne naprave se uporabljajo samo v posebnih primerih in pokrivajo le manjši tržni delež na področju hlajenja. V našem prispevku je predlagan tristopenjski kaskadni sorpcijski hladilni proces, sestavljen iz osnovnega absorpcijskega procesa z dvojnim učinkom in delovnim parom LiBr/H2O ter krovnega procesa, ki deluje z delovnim parom CaO/H2O. Zaradi uporabe vode kot hladiva v krovnem procesu je tlačna raven uparjanja nizka, kar ima za posledico nezadostno intenzivnost faze sinteze glede na fazo razpada. Za rešitev sta predlagani dve spremembi krovnega procesa, pri katerih z dvigom tlačne ravni uparjanja pospešimo proces sinteze v reaktorju. Ugotovili smo da lahko dosežemo hladilno število (HŠ - COP, Coefficient of performance) do 1,6 kljub temu, da s spremenjenim krovnim procesom ne moremo več pridobivati hladu. Ta vrednost pomeni izboljšanje za približno 30 odstotkov glede na učinkovitost industrijskih LiBr/H2O absorpcijskih hladilnih naprav na trgu.

Language:Slovenian
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2000
Publisher:Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:str. 671-682
Numbering:Letn. 46, št. 10
UDC:621.5.013:621.5.011
ISSN on article:0039-2480
COBISS.SI-ID:4248859 Link is opened in a new window
Views:507
Downloads:107
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Secondary language

Language:English
Title:Improvement of topping-cycle efficiency with an increase in evaporation pressure level
Abstract:
The demand for better air conditioning in buildings is increasing from year to year. Compression machines are normally used for cold-air production, due to their compactness and favourable price. Sorption machines are used in special cases only, covering small niches of the cooling market. In our paper a three-stage cascading sorption cycle is proposed, consisting of a bottoming double-effect absorption cycle with a LiBr/H2O working pair and a topping solid-gas cycle with CaO/H2O as the working pair. Because water is used as the refrigerant in the topping cycle the evaporation pressure level is low, what results in the insufficient intensity of the synthesis phase relative to the decomposition phase. As a solution, two modifications of the topping cycle are proposed in which the evaporation pressure level is increased to intensify the synthesis phase. It is shown that coefficient of performance (COP) values of 1.6 could be reached, despite the fact that the topping cycle is not used as a cooling cycle anymore. The COP value represents an improvement of about 30% compared to industrial double-effect LiBr/H2O absorption chillers currently on the market.

Keywords:sorption, cooling, cascading cycles, topping cycles, efficiency

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