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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"subcooling"”.
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Potential of controlling subcooling in residential air conditioning system
… (RAC) system performance by controlling subcooling. Instead of conventional superheat control at evaporator outlet, condenser subcooling is monitored and controlled and the corresponding effects on vapor-compression system performance as well as the sensitivity of subcooling control to …
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Effect of subcooling on film boiling in a horiztonal tube
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Subcooling control to maximize efficiency in reversible A/C-H/P systems
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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The Influence of Water Purity and Subcooling on the Minimum Film Boiling Temperature
Made available in DSpace on 2017-07-06T18:42:11Z (GMT). No. of bitstreams: 2 Adler_Mark_R_MS.pdf: 31275816 bytes, checksum: 99c2040effaee627b9d35beede8dc348 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1979
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The effects of orientation angle, subcooling, heat flux, mass flux, and pressure on bubble growth and detachment in subcooled flow boiling
The effects of orientation angle, subcooling, heat flux, mass flux, and pressure on bubble growth and detachment in subcooled flow boiling were studied using a high-speed video camera in conjunction with a two-phase flow loop that can accommodate a wide range of flow conditions. Specifically, …
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Potentials for COP increase in vapor compression systems
… systems: work recovery ejectors, condenser subcooling and increase of relative size of heat exchangers (HXs). Regarding work recovery ejectors, experimental results showed that the COP of the ejector system increased between 8.2% and 14.8% when compared to a conventional expansion valve …
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Pool boiling - growth of single bubbles at a heated wall
… pressure, thickness of the superheated layer, subcooling and gravity. A transient heating technique was developed to generate a known and controllable temperature profile near the wall. The subcooling was controlled by varying the initial temperature of the bulk liquid and the system pressure. …
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Growth and collapse of vapour bubbles in convective subcooled boiling of water
… flow velocities of 0.08-0.8 m/s, liquid bulk subcooling of 10-60 °C and heat fluxes of 0.1-1.2 MW/m². High speed photographic results showed that bubbles grew to a maximum radius while sliding on the heated surface; condensed slowly while still attached to the heated surface; and ejected into …
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Investigation of advanced experimental and computational techniques for behavioural characterisation of phase change materials (pcms)
… PCM data representation, hysteresis, and finally subcooling. The instrumentation system was iteratively redeveloped and validated in a series of studies until the ±0.5 °C accuracy in PCM related measurements was achieved. Once the desired temperature accuracy was reached the data evaluation …
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Transient flow boiling CHF under exponentially escalating heat inputs
… explores the effects of flow velocity, liquid subcooling and exponential power escalation period on critical heat flux (CHF). The results show that, for our flow conditions, the CHF value does not depend on the escalation period for periods longer than 100 ms, and is essentially the same as in …
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Experimental Study of Meniscus Thin-Film Evaporation in a Horizontal-Tube, Falling-Film Heat Exchanger, Focusing on Dynamic Contact Angle Variation of an Advancing Meniscus
… out investigating the effects of solution subcooling, evaporator wall superheat, and porous-layer coating on the portions of sensible and evaporation heat transfer in a falling-film system. The porous layer was found to enhance both sensible and evaporation heat transfer by exploiting the …
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Predicting hydrates plugging risk in subsea gas pipeline: CFD, analytical and linear regression modelling.
… within a ±10% uncertainty range across various subcooling temperatures and gas velocities. At lower gas velocities (4.7 m/s), the model exhibited significant improvement over existing methods. Compared to a 925.7% deviation from experimental results, the model outperformed an analytical model …
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Experimental study of flow boiling under subatmospheric pressures in a vertical square channel
… flux from 45 kg/m2s to 190 kg/m2s, and inlet subcooling from 0 to 10 K. Heat flux is gradually increased until an excursion of the wall temperature, signifying CHF, occurs. Several existing models that correlate departure characteristics with the relevant dimensionless groups enumerated above …
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Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling
… is performed with mass flux, pressure, and inlet subcooling in a vertical rectangular channel that is heated from one side. CHF excursions are triggered under various system conditions and are compared with existing models. For the experimental conditions considered, the hydrophobic surface showed …
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Experimental study of transient pool boiling heat transfer under exponential power excursion on plate-type heater
… periods ranging from 100 ms to 5 ms and subcoolings of OK (saturation), 25K and 75 K were conducted. The measured pre-ONB heat transfer coefficient agrees well with the theoretical predictions for transient conduction. The ONB and onset of significant void (OSV) temperature and heat flux …
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Secondary loop reversible AC/HP system for electric vehicles
… pump speeds, air flow rates, and condenser exit subcooling were investigated to improve energy efficiency. Performance in different ambient conditions was also studied and compared to the baseline.
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Measurement of the efficiency of a flashing flow nozzle
… an unexplained dependence on the condenser subcooling. Recommendations were therefore made to investigate this unexpected phenomenon.
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An integrated system of vapor-compression chiller and absorption heat pump: Experiment, modeling, and energy and economic evaluation
… System of an Integrated Compression-Absorption Subcooling System (ICASS) Based upon the principle of subcooling effect, the ICASS can improve the efficiency of the cooling device but also achieve additional useful heating sources potentially used for space heating and domestic hot water. The …
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Infrared Thermometry Analysis of Surface Effects in Subcooled and Saturated Boiling of Water
… diverse mass velocities and degrees of subcooling. Through this, bubble dynamic parameters were measured across different surfaces, elucidating the effects of surface characteristics. The interplay between liquid heat transfer and bubble dynamics during subcooled flow boiling was another …
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Flooding and non-equilibrium in counter-current flows with reference to pressurised water reactors
… parameters of inlet water flowrate, inlet subcooling and downcomer wall temperature. A theoretical model for the condensation process was developed which gave good qualitative and quantitative agreement with experiment. Its superiority over a current BCL correlation is demonstrated.
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