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 31 for “"refrigeration system"”.
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Hybrid thermoelectric-ejector refrigeration system /
… conserving biodiversity and maintaining ecosystem services rather than the traditional approach of maximizing and sustaining yield. PES has therefore become an essential tool for achieving the new trend of managing forests for ecosystem services. Fundamental to any PES initiative, is the …
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Integrated cryogenic refrigeration system design for superconducting magnetic energy storage systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Primary refrigeration system commissioning based on a transcritical 2- stage R744 cycle
… of a two-stage trans-critical cooling system that is intended to be used as a chiller for the detectors at CERN's Large Hadron Collider (LHC). It then goes on to describe the steps taken to prepare the system for start-up. These steps include the process of defining how the system …
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Using real-time truck transportation information to predict customer rejections and refrigeration-system fuel efficiency in packaged salad distribution
Companies that operate cold supply chains can greatly benefit from information availability and data generation. The abundance of information now available to cold chain operators and harvested from every echelon of the supply chain, ranging from the procurement process to the sales and customer …
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Análise teórico-experimental do coeficiente de perfomance (COP) de um sistema de refrigeração por jato-compressão
… way of efficiency improvement of energy systems. The present research has as intention the theoretical and experimental study of a new intermittent refrigeration system ejector cycle characteristics, with use of waste heat. Initially, was doing a bibliographical survey about the vapor …
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Availability of solar energy at Baghdad, Iraq and its application to absorption refrigeration for cold stores purposes
… at Baghdad, Iraq for utilisation to produce refrigeration at 10\,1 temperatures where it will be applicable for cold stores and freezer rooms and to prepare design data for such applications. Five years meteorological data are obtained from Baghdad Weather Bureau and the study is based on the …
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An improved control strategy for wind-powered refrigerated storage of apples
… strategy for the operation of a wind-powered refrigeration system for the storage of apples was investigated. The results are applicable to other systems which employ intermittently available power sources, battery and thermal storage, and an auxiliary, direct current power supply. Tests were …
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A Combined Energy–Exergy Approach for Improving Refrigeration Systems in Deep-Level Gold Mines: Method Development and Case Study Validation
… energy consumers on deep-level mines is the refrigeration system, which supplies chilled water for cooling the underground working environment. Due to the outdated nature of these systems, and their fixed supply capacities, they are prone to energy wastage through inefficient operation. …
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Heat pipe dehumidification for supermarket energy savings
… expected to reduce the energy consumption of the refrigeration system due to an improved efficiency of the heat transfer at the display case. This increase in efficiency will be due to reduced frost buildup on the refrigeration coils. Chapter two includes a physical and psychometric analysis of …
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Investigation of miniature lithium-bromide/water absorption refrigeration systems
… which are associated with vapour 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 …
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Thermodynamic analysis of a three-fluid absorption refrigeration machine
… thesis investigates the three-fluid absorption refrigeration system operating on lowgrade (heat) energy. In particular the temperature-time response of the various components of a domestic size absorption unit were investigated with respect to the pressure of hydrogen in the system under varying …
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Design and calibration of an electrodynamic driver for the Space Thermoacoustic Refrigerator (STAR)
… and space qualify a continuous cycle cryogenic refrigeration system for the cooling of sensors and electronics based upon the thermoacoustic heat pumping effect. This thesis describes the design, assembly, and calibration of the electrodynamic driver and its associated performance monitoring and …
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A quasi-steady modeling approach of a heat pump water heater system with experimental validation and analysis
In a heat pump water heater system, the dynamic interdependence between the vapor compression system and the water in the storage tank poses a modeling challenge for steady-state refrigeration system models. The aim of this project is to develop a model and methodology for coupling steady-state …
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Experimental investigation of an ejector as a refrigerant expansion engine
… improve the performance of a vapor compression refrigeration system was investigated. The ejector harnesses kinetic energy developed during the throttling process and returns it to the compressor in the form of a pressure boost. An ejector was designed taking into account the expected …
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Motor vehicle air-conditioning : utilising the exhaust gas energy to power an absorption refrigeration cycle
… car's exhaust gases to power an air-conditioning system. Thus the waste heat can be utilised and shaft power conserved by replacing the traditional compression refrigeration system, used for air-conditioning a motor car, with an absorption unit. The thesis deals with some theoretical aspects of …
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Experimental and analytical investigation of refrigerant and lubricant migration
… measured the lubricant migration within a refrigeration system during cycling or stop/start transients. Therefore, experimental procedures measuring the refrigerant and lubricant migration through the major components of a refrigeration system during stop/start transients were developed and …
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Comparison of refrigerants R410a and R404a for use in low temperature applications: A computer model study
… knowledge is desired on how different an R410a system is from established refrigerant systems and any possibilities for retrofitting. This thesis uses a computer model simulation to specifically compare the performance of R410a and R404a in a supermarket freezer display case system designed for …
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An investigation of the effect of entrained oil on the heat transfer rate of a refrigerant evaporator
… a direct expansion evaporator coil. A modified refrigeration system, in which the oil content of the refrigerant could be varied, was used in conjunction with an air conditioning system, which supplied the evaporator load. The heat transferred to the refrigerant was measured for different …
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