The phase-out of ozone-depleting refrigerants, suchas R-12 and R-22,according to the Montreal Protocol of 1987, hasprovided the incentiveto increase the thermal efficiency of current heating andrefrigeration systems. The purpose of this study wasto increase theaccuracy of the predictions of both theheat transfer and pressure drop correlations forcondensing refrigerants in the Intermittent flowregime. This was doneutilizing a novel method involving the temporal andspectral analysisof the light intensity of the local flow regime, asseen through asight glass. An experimental setup was designed,built and commissionedspecifically for this purpose using refrigerant R-22and a smoothtube. It was found that the accuracy of themean heat transfer coefficient predictions increasedsubstantiallycompared to other leadingcorrelations, particularly at low mass fluxes. Interms of the pressure drop, the predictions alsoincreased inaccuracy, and it was found that the time fractionmethod allows for continuouspredictions over flow regime transitions when usinglocal flow pattern-based pressure drop models.
The phase-out of ozone-depleting refrigerants, suchas R-12 and R-22,according to the Montreal Protocol of 1987, hasprovided the incentiveto increase the thermal efficiency of current heating andrefrigeration systems. The purpose of this study wasto increase theaccuracy of the predictions of both theheat transfer and pressure drop correlations forcondensing refrigerants in the Intermittent flowregime. This was doneutilizing a novel method involving the temporal andspectral analysisof the light intensity of the local flow regime, asseen through asight glass. An experimental setup was designed,built and commissionedspecifically for this purpose using refrigerant R-22and a smoothtube. It was found that the accuracy of themean heat transfer coefficient predictions increasedsubstantiallycompared to other leadingcorrelations, particularly at low mass fluxes. Interms of the pressure drop, the predictions alsoincreased inaccuracy, and it was found that the time fractionmethod allows for continuouspredictions over flow regime transitions when usinglocal flow pattern-based pressure drop models.
Scientific Essay from the year 2018 in the subject Engineering - Power Engineering, , language: English, abstract: Tube bundles are standard equipment in heat exchanger design. Typically, when...
Os irmãos André, Catarina, Felipe, Fábio e a pequena Ana tinham uma vida confortável e feliz. Com a partida de seu pai Antônio para comandar tropas em uma guerra, angustiados com a falta de notícias...
'Peppered with humour, empathy and kindness' - Sunday PostEver since her pet sheep Lulu accompanied her to school at the age of seven, animals and nature have been at the heart of Polly Pullar's...
This book presents an approach to business leadership development to help fill the pressing need for more effective leaders who can operate across cultures. Our HV model of global leadership...
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