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.
Results
Showing 1 to 20 of 39 for “"Evaporators"”.
-
Periodic reverse flow in microchannel evaporators
… on flow reversal are presented. Multiple evaporators with different geometries are tested using R134a as the refrigerant. In each evaporator, the reversed vapor flow is vented out of the inlet header and the flow rate is measured. It has been found experimentally that under the same heat …
-
The dynamics and control of chemical evaporators
vii, 252 leaves : ill.
-
Thermodynamic optimization of evaporators with zeotropic refrigerant mixtures
ETDs are only available to UIUC Users without author permission
-
Design and fabrication of evaporators for thermo-adsorptive batteries
Current heating and cooling within electric vehicles places a significant demand on the battery, greatly reducing their potential driving range. An Advanced Thermo- Adsorptive Battery (ATB) reduces this load by storing thermal energy within a bed of adsorptive sheets. A phase change heat exchanger …
-
A Study of Heat Pump Fin Staged Evaporators Under Frosting Conditions
… fin on the frosting performance of heat pump evaporators and the whole heat pump system have been studied experimentally and theoretically. Frost degrades the performance of fin-and-tube outdoor coils as well as the whole heat pump system. The objective of the experimental part of this study …
-
Scale prevention in sea water evaporators Part II: decarbonation-filtration treatment
… The major difficulty in the operation of the evaporators has been the deposition of an insulating scale composed of calcium sulfate, calcium carbonate, and magnesium hydroxide on the heat transfer surfaces of the evaporators. Various chemical and mechanical treatments have been successfully …
-
Scale prevention in sea water evaporators: Part I design and construction
Evaporators employed in the distillation of sea water have scale form on their heat transfer surfaces as calcium carbonate, magnesium hydroxide, and calcium sulfate in 300 to 500 hours of operation. Although the measures directed to overcome the formation of scale in sea water evaporators have been …
-
Analytical and experimental examination of microwave defrosting method on commercial refrigerator evaporators
Defrosting of domestic refrigerator evaporator coils is currently done with external electrical heaters of various designs using a combination of convection, radiation, and conduction. These designs put unnecessary heat into the refrigerators during the defrosting process and the heat must be taken …
-
Scale prevention in sea water evaporators. Part III. Decarbonation, filtration, and acidification
… which had been successful in preventing scale in evaporators using ground waters, were tried on sea water equipment but no completely satisfactory processing has been found. Mechanical and chemical methods of scale removal are now being used, but these methods offer no solution to the scale …
-
Experimental and modeling study of lubricant effect on refrigerant distribution in microchannel evaporators
… on refrigerant distribution in microchannel evaporators is investigated and the corresponding effects on evaporator performance and system performance are discussed. First, the effect of lubricant on distribution is studied by relating the flow regime in the horizontal inlet header and the …
-
Prediction and mitigation strategies for the transient thermal performance of low thermal resistance microchannel evaporators
… the low thermal resistance of microchannel evaporators increases the potential for device damage and failure since large temperature swings are more likely. Predicting and mitigating the transient response of a low thermal resistance microchannel evaporator is paramount to practical …
-
The development of passive downdraught evaporative cooling systems using porous ceramic evaporators and their application in residential buildings
… project, an improved design for porous ceramic evaporators has been developed for integration into a perimeter cavity wall system, as an alternative form of passive evaporative cooling. This research demonstrates that passive evaporative cooling using porous ceramic can provide thermal comfort …
-
Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… phase adiabatic flow in headers of parallel flow evaporators, of typically microchannel design. Three main issues that will be explored in this thesis are: 1) separation of vapor-liquid refrigerant immediately after an expansion device in a compact T-junction and design options to enhance its …
-
Effects of compositional variables on fouling behavior of thin stillage
… concentrated to 25 to 30% solids in multi effect evaporators. The presence of fouling in evaporators can increase energy consumption as well as capital and labor costs. Limited studies have been conducted on fouling of corn ethanol processing. An annular fouling probe was used to evaluate …
-
An Evaluation and Redesign of a Thermal Compression Evaporator
Evaporators separate liquids from solutions. For maximum efficiency, designers reduce the temperature difference between the heating and heated media using multiple-stage evaporators. This efficiency requires increased size and bulk. A vendor claimed its thermal compression evaporator achieved high …
-
Control and optimization of a multiple-effect evaporator
… is also a large potential to lose sucrose at the evaporators due to the high temperatures and long residence times employed there. The smooth control of the evaporators is thus vital to consistent factory operation, and the evaporators are commonly a sugar factory bottleneck. This study developed …
-
Performance evaluation of a mechanical vapour compression desalination system
… (MVC) desalination system with vertical tube evaporators. To evaluate the performance of the existing setup, four operating variables were considered, which include the top brine temperature (TBT), brine recirculation rate, compressor speed and brine concentration. The setup showed better …
-
Experimentally validated models of refrigerant distribution in microchannel heat exchangers used to evaluate charge reduction of various working fluids
… with focus on microchannel condensers and evaporators. Experiments with different refrigerants including R290, R717, R1234yf, and R134a are used to validate the models. The experimentally validated models are used to compare the charge of various refrigerants. The procedure for charge …
Page 1 of 2