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result(s) for
"Wightman, David"
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Altered Bi-Phase Flow Regime in Supermarket Evaporative Coils: Laboratory and Field Experiences
2005
Examining a typical pressure-enthalpy chart, it is generally believed that the evaporator benefits from a complete stream of liquid entering the coil. The conclusion from this is that maximum enthalpic capacity is achieved by subcooling or even super-subcooling the entering liquid and that anything less than a full column of liquid might limit the amount of heat transfer that the evaporator can accomplish. The evolution in refrigerant flow testing and mapping is now providing support for a different view. This paper will examine the net effect ofan altered bi-phase flow (ABF) regime in evaporative coils, with consideration of a high vapor fraction and turbulent refrigerant flow (HVFT). Furthermore, the pressure-enthalpy chart lends improving evaporator pressures, control during transient operation, refrigerant density at the compressor, and rate of heat transfer among other factors can combine to reduce energy consumption. Two test and verification projects in supermarket mediumand low-temperature display cases and storage applications provide significant support for examining old rules-of-thumb. The first project involves a deli service case tested under laboratory conditions. This test demonstrates the effect of evaporator operation utilizing an ABF regime and compares this to the operation of a pulse-type electronic expansion valve system. The results demonstrated operation with the ABF regime permitted increased compressor suction pressure, improved product temperature, provided more stable refrigerant temperatures, and improved case humidity. The second test and verification project involves field retrofitting of existing direct expansion evaporators to the ABF regime and measuring the results. The resulting change in refrigerantflow regime demonstrated improved performance, resulting in consistent and reduced conditioned supply air and product temperatures, improved oil return, reduced compressor discharge temperatures, and increased evaporator pressure. Product quality and energy savings were also measurable.
Journal Article
Three Compositions: “Bless This Mess”, “Wonderful Things”, “Music is My Life”
by
Wightman, David Andrew
in
Music
2010
This dissertation documents three compositions: Bless This Mess for flute, clarinet, violin, cello, piano and percussion, Wonderful Things for soprano, guitar and vibraphone, and Music is My Life for electric guitar and drum machine. Bless This Mess contrasts disjunct gestures to create ecstatic static textures that develop in musically eccentric manners. Wonderful Things consists of four movements that contain interrupting themes from the remaining three movements. Music is My Life uses heavy metal vocabularies, repetition and physically exhausting performance demands to create a work of ecstatic stasis.
Dissertation
Competitive advantage through information technology
1987
Many organizations, while not being technological innovators themselves, can gain competitive advantage by using information technology. This may be achieved by changing the basis of competition, for example, by affecting entry barriers, supplier relations or switching costs, as well as by generating new products. Based on a number of case studies in financial services, the author argues that the route to success is also based on gaining organization-wide commitment, matching internal structures to market opportunities, recruiting high-quality staff and a multi-disciplinary approach to the implementation of particular projects.
Journal Article
Oh No You Didn't
by
Wightman, David
in
Music
2004
Oh No You Didn't features battling of different musical parameters. These confrontations occur through both simultaneous and alternating presentation of contrasting ideas. The piece's form contains different levels of obscured symmetries, which serve to propel the simplistic motives in new directions. The piece bubbles with insistent rhythmic energy culminating in a frenetic bass solo climax.
Dissertation
Processing, properties, and applications of glass and optical materials
by
Schaeffer, Helmut A
,
Wightman, Marlene
,
Varshneya, Arun K
in
Congresses
,
Glass
,
Materials Science
2012
This publication provides an excellent one-stop resource for understanding the most important current issues in the research in processing, properties and applications in glass and optical materials.
Implicit Dimensions of Contract
by
Wightman, John
,
Campbell, David
,
Collins, Hugh
in
Contract, Tort and Restitution Law
,
Contracts
,
Philosophy
2003
This collection of essays, derived from an international workshop, explores the significance of implicit understandings and tacit expectations of the parties to different kinds of contractual agreements, ranging from simple discrete transactions to long-term associational agreements such as those formed in companies. An interdisciplinary and comparative approach is used to investigate how the law comprehends and gives effect to the these implicit dimensions of contracts. The significance of this enquiry is found not only in relation to the interpretation of contracts in many different contexts, but more fundamentally in how social practices involved in making contracts should be analysed and comprehended.