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 350 for “"air conditioning"”.
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Air conditioning of railway passenger cars
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1939
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An air conditioning system for demonstration and research
… were to investigate the contemporary field of air conditioning in industry and education; to determine what equipment should be recommended for installation in the Mechanical Engineering Laboratory of the Virginia Polytechnic Institute; and to design the components and controls for a unit which …
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Potential of controlling subcooling in residential air conditioning system
… study of one way 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 …
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Role of internal heat exchanger in air conditioning systems
… has been implemented into refrigeration and air-conditioning industry for a long time because of its ability to improve the efficiency of refrigeration cycles for several commonly used and potential substitution of refrigerants (R134a, R744 and R1234yf among them). It provide extra heat …
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Study of Liquid Desiccant Air-Conditioning for High Performance Greenhouses
… This requires the application of a novel air conditioning system to handle the high cooling loads experienced by a greenhouse. Liquid desiccant air-conditioning (LDAC) have been found to provide high latent cooling capacities, which is perfect for the application of a humid greenhouse …
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Analysis of acoustics in heating, ventilation and air conditioning systems
… of acoustics in heating, ventilation and air conditioning systems is presented. The objective of this ASHRAE funded (ASHRAE TRP 556) project was to present the HVAC designer with a set of algorithms for determining the acoustical characteristics of heating, ventilation and air conditioning …
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EnergyPlus Simulation of Single-Coil Twin-Fan Air Conditioning System
… the newly-developed Single-Coil Twin-Fan (SCTF) air conditioning system. The objectives of this project were to develop a customized module of the energy efficient SCTF system, validate the model using industry-accepted simulation verification methods, and implement the module in a program with …
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Operating strategies for economizer control in an air conditioning system
A typical economizer in an air conditioning system is investigated in this paper. New operating strategies of the economizer are proposed. An economizer consists of three coupled dampers--an outdoor air, a recirculation, and a discharge damper--controlled so that the amount of outdoor air may be …
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Distribution of refrigerant and lubricant in automotive air conditioning systems
In automotive air conditioning (A/C) systems, the compressor lubricant is circulated throughout the system with refrigerant. At different oil concentrations, the circulating mixture exhibits different properties, which affects the characteristics of heat transfer, pressure drop and mass retention …
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Heating, ventilation, and air conditioning for a superinsulated solar house
… less expensive than a comparable typical central air heat pump. All these benefits helped to define a house made up of many excellent technologies and practices.
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Liquid-infused slippery surfaces for air-conditioning and refrigeration applications
… and enhance thermal-hydraulic performance for air-conditioning and refrigeration (AC&R) applications. The results demonstrate that the LISs has a sliding angle smaller than 5˚ and reduces the water retention ratio after defrosting by more than 75% compared to the baseline specimen. A delay of …
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Evaluation of Heat Rejection Strategies for Liquid Desiccant Air-Conditioning Systems
… are motivating research into thermally-driven air-conditioning systems that can use renewable or waste heat. One promising technology is the use of a Liquid Desiccant Air-Conditioning (LDAC). An evaporative cooling tower (ECT) was used as a cooling device to reject the heat from a LDAC at …
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Use of seawater for air conditioning a [t] Waikiki Convention Center.
… of a hotel in Hawaii is the cost of energy for air conditioning. Buildings can be constructed to use energy more efficiently by using many methods, however, some of these methods conflict with other concerns, aesthetics for example. Thus the process of designing and building an energy efficient …
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Supervisory Control of a Commercial Heating, Ventilating, and Air Conditioning System
The MPC supervisory controller generated 'optimal' setpoints for lower-level single-input, single-output controllers to maximally utilize the control system framework currently used in the industry. Two different supervisory controller configurations were developed and compared with the existing …
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Dynamic Modeling and Advanced Control of Air Conditioning and Refrigeration Systems
This dissertation makes contributions on both fronts and can be divided into two distinct parts. The first portion of the dissertation presents the development, simulation, and experimental validation of a first principles modeling framework that captures the dynamics of a variety of vapor …
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Development of a Transient System Model of Mobile Air-Conditioning Systems
An important part of the system model is calculating the refrigerant properties correctly. We developed refrigerant property routines to the calculate equilibrium thermodynamic properties in the liquid, vapor, two-phase liquid-vapor, and supercritical region using the Modified-Benedict-Webb-Rubin …
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Superheat control for air conditioning and refrigeration systems: Simulation and experiments
Ever since the invention of air conditioning and refrigeration in the late nineteenth century, there has been tremendous interest in increasing system efficiency to reduce the impact these systems have on global energy consumption. Efficiency improvements have been accomplished through component …
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Design and development of a novel liquid desiccant air-conditioning system
The Direct Evaporative Closed Air Loop (DECAL) system is a novel high efficiency liquid desiccant air-conditioning (LDAC) system which runs primarily on thermal energy rather than electricity. It is designed for residential cooling in hot and humid climates where demand is growing rapidly and …
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A study of factors affecting the cooling load for air conditioning
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1935
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