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: The effects of surface roughness, oxidation level, and liquid subcooling on the minimum film boiling temperature, T min, during quenching of a nuclear fuel rod were investigated experimentally as discussed by the authors.
Abstract: The effects of surface roughness, oxidation level, and liquid subcooling on the minimum film boiling temperature, T min, during quenching of a nuclear fuel rod were investigated experimentally. An instrumented nuclear fuel rod simulator (FRS) was designed and fabricated with different combinations of cladding (Inconel and Zircaloy) and filler (BN and Al2O3) materials. Surface roughness was varied by polishing the FRS with different grades of emery cloth, whereas oxidation level was varied by heating the FRS in an oven under carefully controlled conditions for different time periods. An eddy-current device was used to nondestructively measure the oxide layer thickness on the FRS. Quenching experiments were conducted in a subcooled water bath and the value of T min was determined from the measured temperature transients. For the FRS explored in the experiments, the minimum film boiling temperature was found to depend strongly on the liquid subcooling, oxidation level, and surface roughness.
56 citations
TL;DR: The thermal-hydraulic response of a quiescent liquid layer to sudden depressurization was examined in this article, where Freon-11 at room temperature was used as a test liquid.
56 citations
TL;DR: In this paper, the authors investigated the thermal performance of nanofluid phase change material (NFPCM) for cool thermal energy storage (CTES) system and found that the freezing duration was reduced by 25% in the case of NFPCM along with the elimination of subcooling compared to that of DI water.
Abstract: This study aimed to investigate the thermal performance of nanofluid phase change material (NFPCM) for cool thermal energy storage (CTES) system. The NFPCM was prepared by suspending 0.1 wt. % multiwall carbon nanotubes (MWCNT) in deionized water (DI water) along with pseudomonas as a nucleating agent. The experiments were conducted at various surrounding bath temperatures with the NFPCM. The results evidently showed that the freezing duration was reduced by 25% in the case of NFPCM along with the elimination of subcooling compared to that of DI water. Further, the fraction of mass solidified at various time intervals revealed that 50% of phase change material (PCM) was frozen in 25% of the total freezing time for both the water PCM and NFPCM. The enhanced heat transport properties of the NFPCM along with the elimination of subcooling and accelerating charging will be very useful in designing energy efficient CTES system.
56 citations
TL;DR: In this paper, an experiment based on enthalpy difference method and thermal imaging is conducted on a CO2 loop thermosyphon with micro-channel parallel-flow evaporator and condenser.
56 citations
Abstract: This paper presents a theoretical study about the effect of condenser subcooling on the performance of vapor-compression systems. It is shown that, as condenser subcooling increases, the COP reaches a maximum as a result of a trade-off between increasing refrigerating effect and specific compression work. The thermodynamic properties associated with the relative increase in refrigerating effect, i.e. liquid specific heat and latent heat of vaporization, are dominant to determine the maximum COP improvement with condenser subcooling. Refrigerants with large latent heat of vaporization tend to benefit less from condenser subcooling. For an air conditioning system, results indicate that the R1234yf (+8.4%) would benefit the most from condenser subcooling in comparison to R410A (7.0%), R134a (5.9%) and R717 (2.7%) due to its smaller latent heat of vaporization. On the other hand, the value of COP maximizing subcooling does not seem to be a strong function of thermodynamic properties.
56 citations