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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01 Jan 1970
95 citations
TL;DR: In this paper, an experimental investigation of the optimal heat rejection pressure for a transcritical CO 2 heat pump water heater is presented, and it is found that the optimal PSR varies with gas-cooler outlet refrigeration temperature at different ambient temperatures.
95 citations
TL;DR: The additive model for the convective and nucleate boiling components originally suggested by Bergles and Rohsenow (1964) for subcooled and low-quality regions was employed in the Kandlikar correlation (1990a) for flow boiling in smooth tubes.
Abstract: The additive model for the convective and nucleate boiling components originally suggested by Bergles and Rohsenow (1964) for subcooled and low-quality regions was employed in the Kandlikar correlation (1990a) for flow boiling in smooth tubes. It is now extended to augmented tubes and compact evaporators. Two separate factors are introduced in the convective boiling and the nucleate boiling terms to account for the augmentation effects due to the respective mechanisms. The fin efficiency effects in the compact evaporator geometry are included through a reduction in the nucleate boiling component over the fins due to a lower fin surface temperature. The agreement between the model predictions and the data reported in the literature is within the uncertainty bounds of the experimental measurements.
95 citations
TL;DR: In this paper, the authors explore experimentally stabilizing flow boiling water in ten parallel micro-channel heat sinks with a diverging cross-section design and show that the stability boundary is plotted on the plane of the subcooling number against the phase change number (Npch).
Abstract: This paper explores experimentally stabilizing flow boiling water in ten parallel microchannel heat sinks with a diverging cross-section design. Each diverging microchannel has a mean hydraulic diameter of 120 µm and a diverging angle of 0.5° while the channel depth is uniform at 76 µm. Flow visualization shows that heat flux and mass flux significantly affect the stability of flow boiling in the parallel microchannels. The extent of pressure drop oscillations may be regarded as an index for the onset of flow boiling instability. The stability boundary is plotted on the plane of the subcooling number (Nsub) against the phase change number (Npch) and compared with microchannels with a uniform cross-section design in the literature. The present study confirms that, in terms of stability performance, the flow boiling in the parallel microchannel heat sinks with a diverging cross-section design is superior to a uniform cross-section design.
94 citations
TL;DR: In this article, an exergy-based approach is applied to a sub-cooled and superheated vapor compression refrigeration system for determining the optimum heat exchanger areas with the corresponding optimum subcooling and super-heating temperatures.
94 citations