Global ETD Search
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 33 for “"Cooling power"”.
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Cooling Power Electronic Building Blocks Aboard Navy Ships
The Navy Integrated Power and Energy Corridor (NiPEC) is a modular entity that encapsulates all the power handling requirements of a shipboard power and energy distribution system including transmission, conversion, protection, isolation, control and storage. The basic component of the NiPEC is the …
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The development of high cooling power and low ultimate temperature superfluid Stirling refrigerators by Ashook B. Patel.
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Design and Optimization of Adsorption Systems for Automotive Climate Control
… at 90 ℃ for desorption, and produce 1.5 kW cooling power over a 400 second cycle. The proposed design met all of the specifications proposed by Ford for automotive air conditioning systems, marking a significant milestone for the deployment of adsorption-based cooling for portable cooling …
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Design and analysis of the power electronics system for the Lean Operation Rotary Adsorption Cooling System
The Lean Operation Rotary Adsorption Cooling System (LORACS) was developed in order to investigate avenues for more sustainable space cooling systems in the face of the growing threat of global warming. While traditional cooling systems rely on large amounts of grid electricity and a suite of …
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Photonic crystal enhanced LED for electroluminescence cooling
… diode (LED) consumes low-entropy electrical power and emits incoherent photons. In this process, the lattice heat also contributes to the output power if the LED operates at voltages below the photon energy (qV < h[omega]). Therefore, an LED can potentially cool itself, and the phenomenon is …
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Electro-Thermal Codesign in Liquid Cooled 3D ICs: Pushing the Power-Performance Limits
… systems is usually accompanied by increased chip power consumption and system temperature. Modern CPUs dissipate an average of 70-100W power while spatial and temporal power variations result in hotspots with even higher power density (up to 300W/cm^2). The coming years will continue to witness a …
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Enhanced Ambient Heat Rejection in Passive Thermal Management Systems
The combined trends of increasing computing power with the miniaturization of electronic devices brought about new challenges in terms of ambient heat rejection. The most simple and reliable ambient heat rejection method is natural air convection. However, this technique is limited in terms of the …
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Evaluating energy dissipation during expansion in a refrigeration cycle using flue pipe acoustic resonators
… a refrigerant stream in order to achieve greater cooling power from a cryorefrigeration cycle. Two models of the acoustic operation of flue pipe resonant systems are examined: an electrical circuit analog that represents the linear approximation of the acoustic system and a numerical model based …
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Subambient Passive Cooling Enabled by Polyethylene Aerogels
Subambient cooling is vital for promoting human health and well-being, driving sustainable economic growth, and minimizing food waste. Providing these benefits however, comes with major energetic and environmental costs. The over 1.6 billion air conditioning units currently in use around the world …
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Modeling and Optimization of Tunable Insulated Hybrid Cooling to Extend Food Shelf-life Using Scalable and Affordable Materials
Cooling is a pivotal technology for tackling the global food crisis by securing the food shelf-life. More than 15% of food loss is due to improper food storage temperatures in developing countries. Every 10℃ temperature drop can increase food shelf-life by 2-3 times. However, conventional …
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Mitigating variability in HPC systems and applications for performance and power efficiency
Power consumption and process variability are two important, interconnected, challenges of future generation large-scale High Performance Computing (HPC) data centers. For example, current production petaflop supercomputers consume more than 10 megawatts of machine and cooling power that costs …
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Drawn Polymer Fiber Recuperative Heat Exchangers
… liquefied with a mass flow rate of 34 mg/s and cooling power of 200 mW at 80 K.
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Analyzing the effect of pressure drop on flow rate of hot water in the intercoolers assembly of the Lean Operation Rotary Adsorption Cooling System
The lean operation rotary adsorption cooling system, a novel idea using a readily available low-grade heat and using desiccant wheel to provide a cooling power, was tested this semester. Specifically, this experimental study focuses on the pressure drop of hot water in the two intercoolers that are …
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Cryogenic optical refrigeration
… recent achievements in optical refrigeration, cooling a 5 wt. % ytterbium doped yttrium lithium fluoride (Yb+3:YLF) crystal through anti-Stokes fluorescence to a new record low temperature. This is the coldest temperature to date, without the use of cryogens or mechanical refrigerators, and is …
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Cryogenic optical refrigeration: Laser cooling of solids below 123 K
… recent achievements in optical refrigeration, cooling a 10% wt. Ytterbium doped Yttrium Lithium Fluoride (Yb+3:YLF) crystal via anti-Stokes fluorescence to a record low temperature ~114(+\\-1)K (below NIST-defined cryogenic 123 K) from room temperature (ΔT ~185 K) in a single stage with a …
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Design of a single orifice pulse tube refrigerator through the development of a first-order model
… construction of actual OPTRs. The model predicts cooling power as well as the pressure/volume relationships for various segments of the refrigerator with minimal computational requirements. The first portion of this document describes the development of this model and its simplifications relative …
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Superconducting rotor with self-contained thermal management system
… machines can reach incredibly high specific power and are especially desirable for weight-sensitive applications including aircraft electric propulsion. However, thermal management of the cryogenic environment has posed challenges to building practical aerospace SC machines. Traditional …
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Predictive models for power dissipation in optical transceivers
Power dissipation in optical networks is a significant problem for the telecommunications industry. The optical transceiver was selected as a representative device of the network, and a component based power model is developed for it. This model indicates that there are three key power dissipating …
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Optimal Scheduling Method for Multi-Energy System
… multi-energy systems composed of electrical power, natural gas, heating power, cooling power networks and energy storage are attracting more attention and are being developed rapidly in recent years. Traditionally, different energy infrastructures are scheduled and operated independently, …
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Experimental Investigation of Heat Transfer to Tightly Packed Cylinder Arrays
… of heat transfer characteristics of battery cooling is becoming an ever pressing issue due to the need to optimize volume and mass in a safe manner. Tighter spacings between batteries provide higher pack densities, however, at the cost of increased cooling power and decreased cooling …
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