Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Electronic expansion valves are progressively substituting conventional expansion devices such as capillary tubes and thermostatic expansion valves. Despite of higher initial cost, electronic expansion valve offers greater benefits that include wide range of capacity coverage, precise superheat control and optimum refrigerant flow rate. In this paper, the performance characteristics for both thermostatic and electronic expansion valve were evaluated. An externally equalized thermostatic expansion valve and a pulse width modulating electronic expansion were installed in parallel on a 15.5 kW water cooled scroll chiller. The performance ratings of the expansion valves were investigated at various set points that cover a wide range of operating conditions. A total of 27 different operating steady state set points were studied by manipulating the leaving chilled water temperatures, Tout,evap (6.7°C, 8.0°C, and 9.5°C), entering cooling water temperatures, Tin,cond (28°C, 29.4°C, and 31.0°C) and the compressor frequencies (50 Hz, 42.5 Hz and 35 Hz). The required water temperatures were achieved using mixing chambers and regulated to within 0.15°C of the desired set points with the aid of PID controlled modulating valves. As for the compressor frequency modulation, a variable speed drive was retrofitted to the system to study the part load performances. The performances of the valves were reviewed from the perspective of superheat control, cooling load, heat exchangers' effectiveness and internal entropy generation.

Original languageEnglish
Title of host publication5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System
PublisherJapan Society of Refrigeration and Air Conditioning Engineering (JSRAE)
ISBN (Print)9781634391252
Publication statusPublished - 2010
Externally publishedYes
Event5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010 - Tokyo
Duration: 7 Jun 20109 Jun 2010

Other

Other5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010
CityTokyo
Period7/6/109/6/10

Fingerprint

Water
Compressors
Variable speed drives
Capillary tubes
Frequency modulation
Cooling water
Temperature
Tin
Heat exchangers
Flow of fluids
Entropy
Flow rate
Cooling
Costs

Keywords

  • Electronic expansion valve
  • Entropy Generation
  • Superheat control
  • Thermostatic expansion valve

ASJC Scopus subject areas

  • Engineering(all)
  • Environmental Engineering

Cite this

Saththasivam, J., & Ng, K. C. (2010). Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller. In 5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE).

Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller. / Saththasivam, Jayaprakash; Ng, Kim Choon.

5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System. Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE), 2010.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Saththasivam, J & Ng, KC 2010, Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller. in 5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System. Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE), 5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010, Tokyo, 7/6/10.
Saththasivam J, Ng KC. Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller. In 5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System. Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE). 2010
Saththasivam, Jayaprakash ; Ng, Kim Choon. / Performance study of thermostatic and electronic expansion valves of a water-cooled scroll chiller. 5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System. Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE), 2010.
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