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 12 of 12 for “"Vapor compression system"”.
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Commissioning of experimental facility for oil circulation rate measurements in a vapor compression system
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Dynamic modeling and control of transcritical vapor compression system for battery electric vehicle thermal management
… is an increasing trend among vehicle systems such as aircrafts, heavy machinery, and civilian transportation. Battery electric vehicles (BEVs) are one such development that use a battery pack to generate electrical energy used to propel the vehicle and power its auxiliaries. However, …
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The performance of a reversible R744 vapor compression system with an internal heat exchanger in continuous frosting/ defrosting cycles
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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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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Analysis of a Trigeneration System Through Transient Simulations
… a transient computer model of a trigeneration system using TRNSYS software. This simulation model can accurately reproduce the results from a real world experiment of a trigeneration system conducted over five days. This model is then applied to an entire cooling season to show the primary …
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Experimental investigation of an ejector as a refrigerant expansion engine
… of an ejector to 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 …
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Design of a small-scale and off-grid water desalination system using solar thermal heating and mechanical vapor compression
… a small-scale and off-grid water purification system is proposed. The system utilizes solar energy through both solar thermal collection to rapidly heat up water and solar photovoltaics (PV) to power a mechanical vapor compression system, and is designed for low-cost and high output …
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Potential of controlling subcooling in residential air conditioning system
… of improving residential air-conditioning (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 …
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A hierarchical control strategy for aircraft thermal systems
Aircraft systems present an interesting control problem given the fact that there exist multiple objectives, actuators, and physical dependencies throughout the system. For decades the onboard systems of aircraft have worked in isolation seeking to achieve their goals while giving little to no …
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Effects of Two-Phase Flow in a Multistage Centrifugal Compressor
The performance of a vapor compression system is known to be affected by the ingestion of liquid droplets in the compressor. In these multiphase flows, the liquid and the vapor phase are tightly coupled. Therefore the interphase heat, mass and momentum transfer as well as droplet dynamics including …
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Non-equilibrium effects on in-tube condensation from superheated vapor
In a vapor-compression system, refrigerant leaves compressor as superheated vapor. After entering the condenser, energy is transferred out of the refrigerant flow. As a result, the thermodynamically averaged temperature, namely the bulk temperature, of the refrigerant decreases. Conventionally when …
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Dynamic modeling, validation, and control for vapor compression systems
… process of model-based control design for vapor compression systems (VCSs), from nonlinear model development to linearization and control formulation. Addressing gaps in the previous literature, the equations behind each model and control approach are clearly stated and emphasis is placed …