Applying a variable geometry ejector in a solar ejector refrigeration system

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dc.contributor.authorVan Nguyen, Vu
dc.contributor.authorVarga, Szabolcs
dc.contributor.authorSoares, Joao
dc.contributor.authorDvořák, Václav
dc.contributor.authorOliveira, Armando C
dc.date.accessioned2020-03-10T07:26:07Z
dc.date.available2020-03-10T07:26:07Z
dc.date.issued2020-05
dc.description.abstractThis paper presents an experimental study of the influence of a variable geometry ejector (VGE) design on the performance of a small-scale, 1.5 kW nominal capacity solar heat driven ejector air-conditioning system under real-life working conditions. Under variable operating conditions (e.g. solar radiation, ambient temperature) fixed geometry ejector performs poorly, therefore the objective of the present work was to prove the benefit of the VGE concept. In the experimentally tested VGE the area ratio through a movable spindle (SP) and the nozzle exit position (NXP) can be adjusted in order to respond to the operating conditions. The results showed very stable operation of the cooling cycle during the experiments. Both NXP, SP had considerable influences on the cooling cycle performance. An optimal NXP was identified, which did not change with various operating conditions. Similarly, SP also showed an optimum; however, the optimum point depended strongly on the operating conditions. The results clearly indicated the benefit of using the VGE design over the fixed geometry. COP improvement was as high as 24% with a maximum of 0.29 corresponding to a cooling capacity of 1.6 kW when compared to a fixed geometry ejector. The study also confirmed the importance of using a variable-speed pump in the ejector cycle.cs
dc.format.extent9 strancs
dc.identifier.doi10.1016/j.ijrefrig.2020.01.018
dc.identifier.issn1407007
dc.identifier.urihttps://dspace.tul.cz/handle/15240/154619
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0140700720300438
dc.language.isocscs
dc.publisherElsevier Ltd
dc.relation.ispartofInternational Journal of Refrigeration
dc.subjectNozzle exit positioncs
dc.subjectR600acs
dc.subjectSolar ejector refrigeration systemcs
dc.subjectSpindle positioncs
dc.subjectVariable geometry ejectorcs
dc.titleApplying a variable geometry ejector in a solar ejector refrigeration systemcs
local.accessopen access
local.citation.epage195
local.citation.spage187
local.relation.volume113
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