Study on efficiency improvement of packaged air conditioners for year round cooling with indirect outdoor air cooling (study on control methods of room air temperature and superheat)

Tsuneo Uekusa, Masahide Yanagi, Shinji Kimijima, Sunao Kawai

Research output: Contribution to journalArticle

Abstract

The air conditioner which cools telecommunication equipment rooms or computer rooms must operate throughout the year. So we apply refrigerant pump cycle to the air conditioner to improve coefficient of performance (COP) at low outdoor air temperature. At first, this paper discusses two kinds of control methods. One is superheat control to manipulate refrigerant pump frequency. Refrigerant pump cycle controlled by this method can operate higher efficiency than that controlled by expansion valve. The other is room air temperature control method to manipulate air flow rate of condenser. Next, this paper discusses year round electric consumption comparison with conventional air conditioner. The electric consumption of the air conditioner with refrigerant pump is 50% shorter than that of conventional air conditioner.

Original languageEnglish
Pages (from-to)2097-2101
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume67
Issue number660
Publication statusPublished - 2001 Aug
Externally publishedYes

Fingerprint

air cooling
rooms
Cooling
cooling
refrigerants
air
Refrigerants
Air
pumps
Pumps
Temperature
temperature
cycles
Telecommunication equipment
temperature control
condensers
air flow
telecommunication
Temperature control
flow velocity

Keywords

  • Air conditioner
  • Coefficient of performance
  • Control method
  • Indirect outdoor air cooling
  • Refrigerant pump
  • Year round cooling

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

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abstract = "The air conditioner which cools telecommunication equipment rooms or computer rooms must operate throughout the year. So we apply refrigerant pump cycle to the air conditioner to improve coefficient of performance (COP) at low outdoor air temperature. At first, this paper discusses two kinds of control methods. One is superheat control to manipulate refrigerant pump frequency. Refrigerant pump cycle controlled by this method can operate higher efficiency than that controlled by expansion valve. The other is room air temperature control method to manipulate air flow rate of condenser. Next, this paper discusses year round electric consumption comparison with conventional air conditioner. The electric consumption of the air conditioner with refrigerant pump is 50{\%} shorter than that of conventional air conditioner.",
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AU - Kimijima, Shinji

AU - Kawai, Sunao

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AB - The air conditioner which cools telecommunication equipment rooms or computer rooms must operate throughout the year. So we apply refrigerant pump cycle to the air conditioner to improve coefficient of performance (COP) at low outdoor air temperature. At first, this paper discusses two kinds of control methods. One is superheat control to manipulate refrigerant pump frequency. Refrigerant pump cycle controlled by this method can operate higher efficiency than that controlled by expansion valve. The other is room air temperature control method to manipulate air flow rate of condenser. Next, this paper discusses year round electric consumption comparison with conventional air conditioner. The electric consumption of the air conditioner with refrigerant pump is 50% shorter than that of conventional air conditioner.

KW - Air conditioner

KW - Coefficient of performance

KW - Control method

KW - Indirect outdoor air cooling

KW - Refrigerant pump

KW - Year round cooling

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