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 50 for “"cooling capacity"”.
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Investigations into solar powered diffusion-absorption cooling machines
Solar thermal driven or assisted absorption cooling machines are gaining increasing importance due to the continually growing demand for airconditioning in domestic housing as well as office and hotel buildings. Presently there are no thermally driven absorption cooling machines available on the …
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Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller
… levels (which are assumed to be of infinite heat capacity in most studies). Heat transfer interactions that occur between the heat reservoirs and the internal components are of high importance to determine the efficiency and cooling capacity of absorption chillers. The purpose of this study is to …
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Investigation of miniature lithium-bromide/water absorption refrigeration systems
… compression refrigeration systems, alternative cooling means, like the Lithium-Bromide/Water (LiBr/H2O) absorption refrigeration system, are being investigated and produced in developed countries. However, the majority of these LiBr/H2O absorption refrigeration systems, which are available on …
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Two phase flow distribution in parallel flow heat exchangers -- experimentally verified model
… model in every case. In order to compare cooling capacity prediction, the mass flow rate in the uniform distribution model was then increased until the exit superheat matched the superheat of the maldistribution model. For every case, the cooling capacity is over predicted by the uniform …
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Experimental and Analytical Investigation of a Two-Phase Ejector Used for Expansion Work Recovery in a Transcritical R744 Air-Conditioning System
Although the reduced cooling capacity and coefficient of performance (COP) at elevated outdoor temperatures represent an inherent drawback of the transcritical carbon dioxide (CO2, R744) refrigeration cycle, the supercritical heat rejection pressure can be used to maximize the system performance. …
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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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Moderation of high-energy fast neutrons in beryllium from a tokamak fusion reactor and heat transfer to the cooling water system
… transfer through the model is performed and the cooling capacity of the coolant channels via convective heat transfer is explored.
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Industrial heat stress : Using ice slurry ingestion as a practical approach to reducing heat strain in workers
… overall aim of the thesis was to quantify the cooling capacity of an ice slurry beverage, and to measure the physiological responses of this simple, easily implementable and cost effective cooling intervention.
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Experimental Characterization of Heat Transfer and Fluid Flow in TCR Fuel Elements under Varying Operational Conditions
… conditions. Nitrogen was utilized as the cooling medium, with experiments carried out at pressures ranging from 300 to 600 psi and temperatures spanning 100°C to 300°C. Critical parameters, including inlet and outlet gas temperatures, wall temperatures at both ends of the core, and coolant …
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Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… an intention for application in A/C systems with cooling capacities about 1.5 to 6 kW. Flow patterns in the T-junction separator are identified and characterized. It is found that liquid separation efficiency strongly depends on the flow pattern right above the impact region (junction). The …
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Evaluation of film, jacket and internal cooling during fermentation of grape juice
… and experimental aspects of water-film cooling, jacket cooling and internal cooling, which are the three predominant types of fermentation cooling found in the South African wine industry. During the past decades questions were constantly raised concerning the thermal efficiency of …
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Integration of Extremum Seeking and Model Predictive Control for Discrete Time Systems
… seeking approach. Further, because the required cooling capacity (and therefore compressor speed) is a function of measured and unmeasured disturbances, the optimal compressor discharge temperature set-point must vary according to these conditions. We show that the energy optimal discharge …
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Design Methodology for an Ultra-High Efficiency Coreless Resonant Power Transformer
… to the elimination of core losses. For a given cooling capacity, pushing the efficiency of these devices by as little as a fraction of a percent can lead to a substantial increase in power throughput capability. In order to achieve ultra-high efficiency designs, several advanced conductor …
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A study on the characteristics of the flow inside a thermostatic expansion valve
… the most efficient mode and achieve the desired cooling capacity at the same time. Yet TEV or EEV can either starve or over feed the evaporator, due to the response time to the change of superheat degree, and inaccurate control of the valve opening and closing. Either starving or over feeding the …
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Cost Effective Method for the Evaluation of a Formula SAE Engine Cooling System
… Formula SAE cars prompted a study evaluating the cooling module performance. The challenge faced by many Formula SAE teams internationally is a large limit on their budget and resources as well as their short development cycle. The developed experimental method needed to be straight-forward and to …
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MASS BALANCE: Design strategies for lightweight, thermally massive construction systems
… mass performance by 6.5% and their active cooling capacity by 14.5%. Moreover, the implementation of multi-optimization techniques allows for the exploration of Pareto-optimal designs that, at the expense of lowering the material savings achievements to 38%, can further improve their …
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An experimental investigation of heat transfer to hydrogen peroxide in microtubes
… thus adding a critical constraint to the cooling scheme. To address this issue, heat transfer experiments in 95 [mu]m inside diameter, 4 mm long, electrically heated stainless steel microtubes have been performed to define the stability limit and explosion condition associated with 98% …
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Validation of a Simplified Building Cooling Load Model Using a Complex Computer Simulation Model
… has become a useful tool for predicting cooling, heating and electrical loads for facilities. Simulation models have been validated throughout the years by comparing simulation results to actual measured values. The simulations have become more accurate as approaches were changed to be …
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HOW TO REDUCE TRANSPLANT STRESS IN URBAN TREES
… and (iv) how severe pruning influences tree cooling capacity and microclimate amelioration in street conditions. The first experiment was conducted in a forest nursery, where seedlings of woody species were grown in a substrate amended with different doses of a pure A. nodosum extract. …
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Evaluating the performance of passive chilled beams with respect to energy efficiency and thermal comfort
… results, models that can predict total cooling capacity and chilled surface temperature of passive chilled beams were developed. These models use essential operating conditions of the system and thermal conditions in the environment as inputs and are able to predict the energy and …
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