Topic
Subcooling
About: Subcooling is a research topic. Over the lifetime, 6150 publications have been published within this topic receiving 99125 citations.
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TL;DR: In this article, a series of nanoscale molecular dynamics simulations of supersaturated water-methane mixtures was performed and it was shown that the order of the crystalline structure increases by decreasing subcooling.
Abstract: Methane hydrates are crystalline structures composed of cages of hydrogen-bonded water molecules in which methane molecules are trapped. The nucleation mechanisms of crystallization are not fully resolved, as they cannot be accessed experimentally. For methane hydrates most of the reported simulations on the phenomena capture some of the basic elements of the full structure. In few reports, formation of crystalline structures is reached by imposing very high pressure, or dynamic changes of temperature, or a pre-existing hydrate structure. In a series of nanoscale molecular dynamics simulations of supersaturated water–methane mixtures, we find that the order of the crystalline structure increases by decreasing subcooling. Crystalline structures I and II form and coexist at moderate temperatures. Crystallization initiates from the spontaneous formation of an amorphous cluster wherein structures I, II, and other ordered defects emerge. We observe the transient coexistence of sI and sII in agreement with expe...
125 citations
TL;DR: In this paper, a comprehensive review of the recent studies that consider subcooling as a way to upgrade the performance of CO2 refrigeration cycles is presented, with overall improvements up to 12% with internal heat exchangers, 22% with economizers, 25.6% with thermoelectric systems and 30.3% with dedicated sub-cooling methods.
Abstract: CO2 subcooling has resulted a method to upgrade the performance of CO2 refrigeration plants in the recent years, with overall improvements up to 12% with internal heat exchangers, 22% with economizers, 25.6% with thermoelectric systems and 30.3% with dedicated subcooling methods. This paper comprehensively reviews the recent studies that consider subcooling as a way to upgrade the performance of CO2 refrigeration cycles. The review is limited to CO2 refrigeration cycles with accumulation receiver for commercial purposes and does not consider air conditioning or MAC systems. It is organized as follows: first, the thermodynamic aspects of subcooling in CO2 refrigeration cycles are described and discussed; second, the main results and conclusions of the recent investigations are analysed inside two big groups: subcooling internal methods and subcooling external methods. Finally, the review synthesizes the current state of the art and points out the lines of research that deserve future developments.
124 citations
TL;DR: In this article, the authors measured saturated critical heat flux (CHF) data in two different multi-microchannel heat sinks made in copper with three low pressure refrigerants (R134a, R236fa, R245fa).
123 citations
TL;DR: In this paper, the authors focus on acquiring accurate flow boiling heat transfer data and flow pattern visualization for three refrigerants, R134a, R236fa and R245fa in a 1.030 mm channel.
123 citations
TL;DR: In this article, an experimental study of forced convective subcooled boiling heat transfer to water was performed at heat fluxes that ranged beyond 10 8 W m −2, and the predictive ability for the critical heat flux (CHF) at high heat flux was obtained.
123 citations