Auteur James E. Braun
Documents disponibles écrits par cet auteur (7)
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Howard Cheung, Auteur ; James E. Braun, Auteur |Multi-split ductless heat pumps are touted as an energy efficient option for air conditioning and heating in residential and small commercial applications. However, their use of multiple indoor units with variable speed compressor and fans and c[...]
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A computationally efficient hybrid leakage model for positive displacement compressors and expanders
Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur |An empirical frictional correction factor to the isentropic nozzle model has been developed for application to refrigerant leakage modeling in scroll, rotary and other similar compressors and expanders. This correction factor is derived by calcu[...]
Article : texte imprimé
Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur |In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. The compressor was[...]
Article : texte imprimé
Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur |A model of a novel rotary spool compressor has been developed to explore the effect of multiple injection ports on compressor and cycle performance. The thermodynamic model includes the effects of heat transfer and leakage and is numerically sol[...]
Article : texte imprimé
Kim, Woohyun, Auteur ; James E. Braun, Auteur |The primary goal was to evaluate and enhance a virtual refrigerant charge (VRC) sensor developed by Li and Braun (2006, 2009). Based on the evaluation, the VRC sensor was found to work well in estimating refrigerant charge for systems that do no[...]
Article : texte imprimé
Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur |While economizing can improve the performance of vapor compression cycles, the cost of multi-stage compressors has limited its implementation to large-scale applications. However, the development of compressors with injection ports presents new [...]
Article : texte imprimé
Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur |Vapor compression refrigeration technology has seen great improvement over the last several decades in terms of cycle efficiency through a concerted effort of manufacturers, regulators, and research engineers. As the standard vapor compression s[...]
