rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Development and Testing of a Prototype Pilot Expansion Valve for Vapor Compression Systems
  name:
    name part: Youmsi Pete, Edwin Larry
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Rasmussen, Bryan
    role:
      role term: thesis advisor.
  name:
    name part: Caton, J. A. (Jerald A.)
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2015
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: The Vapor Compression Cycle (VCC) is the fundamental thermodynamic principle behind most Heating, Ventilation, Air Conditioning and Refrigeration (HVACR) systems. HVACR systems account for a vast majority of the energy used in residential and commercial buildings. There is a growing need to make these VCC systems and their respective components more energy efficient. This thesis proposes a prototype pilot expansion device. Preliminary results have shown that this prototype expansion valve outperforms most of the expansion devices currently being used in HVACR applications. Valve hunting and superheat control are very important elements in the operation of expansion valves. They reduce system efficiency and increase energy consumption. To address these problems, the combination of conventional expansion valves with other expansion devices or components is still a relatively unexplored area. This approach has the potential to improve the energy efficiency of HVACR systems thus reducing cost of operation. This thesis discusses the development, design and proof-of-concept testing of a Prototype Pilot Expansion Valve (PPEV). A number of tests were designed and carried out in order to objectively compare the performance of the PPEV to that of an Electronic Expansion Valve (EEV) and a Thermal Expansion Valve (TEV) under a variety of operational conditions. These tests involve a superheat change test, startup test and external fluid flow rate test, all carried out at varying compressor speeds. The tests were carried out on a custom-built modulated water chiller system and a residential heat pump system. The results obtained from these tests validated that the PPEV performed significantly better than the EEV and the TEV. It was able to provide more cooling, better superheat control and consistently higher Coefficient of Performance (COP). In addition, this thesis also provides and proves the validity of a mathematical model for the Prototype Pilot Expansion Valve. Furthermor…
  note: by Edwin Larry Youmsi Pete.
  note: "Major Subject: Mechanical Engineering"
  note: Includes vita.
  note: Master of Science Texas A & M University 2015 http://hdl.handle.net/1969.1/155017
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major Mechanical Engineering
  subject:
    topic: vapor compression system
  subject:
    topic: expansion valve
  identifier: http://hdl.handle.net/1969.1/155017
  record info:
    record content source: TXA
    record creation date: 160226
    record change date: 20170928111955.0
    record identifier: in00003610272
    language of cataloging:
      language term: eng