ZA8410041B - Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves - Google Patents

Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves

Info

Publication number
ZA8410041B
ZA8410041B ZA8410041A ZA8410041A ZA8410041B ZA 8410041 B ZA8410041 B ZA 8410041B ZA 8410041 A ZA8410041 A ZA 8410041A ZA 8410041 A ZA8410041 A ZA 8410041A ZA 8410041 B ZA8410041 B ZA 8410041B
Authority
ZA
South Africa
Prior art keywords
integrally
air conditioning
conditioning system
variable speed
system utilizing
Prior art date
Application number
ZA8410041A
Other languages
English (en)
Inventor
Daniel B Baer
Stephen C Sillato
Original Assignee
Liebert Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebert Corp filed Critical Liebert Corp
Publication of ZA8410041B publication Critical patent/ZA8410041B/xx

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
ZA8410041A 1983-12-27 1984-12-21 Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves ZA8410041B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/565,407 US5177972A (en) 1983-12-27 1983-12-27 Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves

Publications (1)

Publication Number Publication Date
ZA8410041B true ZA8410041B (en) 1985-08-28

Family

ID=24258465

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA8410041A ZA8410041B (en) 1983-12-27 1984-12-21 Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves

Country Status (8)

Country Link
US (1) US5177972A (ko)
EP (1) EP0148108A3 (ko)
KR (1) KR930004380B1 (ko)
AU (1) AU569766B2 (ko)
CA (1) CA1235584A (ko)
DE (1) DE148108T1 (ko)
PH (1) PH22482A (ko)
ZA (1) ZA8410041B (ko)

Families Citing this family (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0599484A (ja) * 1991-07-12 1993-04-20 Mitsubishi Electric Corp 空気調和機の運転制御装置
EP0541157A1 (en) * 1991-11-04 1993-05-12 Whirlpool Europe B.V. Refrigerating device
US5423480A (en) * 1992-12-18 1995-06-13 Sporlan Valve Company Dual capacity thermal expansion valve
US5277364A (en) * 1992-12-18 1994-01-11 Sporlan Valve Company Dual capacity thermal expansion valve
EP0959308B1 (en) * 1993-11-12 2004-11-03 SANYO ELECTRIC Co., Ltd. Air conditioner
FR2715716B1 (fr) * 1994-02-01 1996-04-12 Jacques Bernier Dispositif de production de froid économiseur d'énergie, autonome ou intégrable dans le circuit des machines frigorifiques.
JP3327317B2 (ja) * 1995-10-09 2002-09-24 株式会社荏原製作所 インバータの水冷方法
NL1004208C2 (nl) * 1996-10-04 1998-04-07 Imperator Engineering & Consul Koelinrichting van het type met een kringloop van koelfluïdum en werkwijze voor het bedrijven daarvan.
JPH1113635A (ja) * 1997-06-30 1999-01-19 Matsushita Electric Ind Co Ltd 圧縮機駆動装置
US6053000A (en) * 1999-01-15 2000-04-25 Levitin; Mikhail Refrigeration unit
US6209330B1 (en) 1999-05-17 2001-04-03 Caterpillar Inc. Modular air handling system and method for providing cooling
US6272869B1 (en) * 2000-06-30 2001-08-14 American Standard International Inc. Multiple orifice expansion device
US6718277B2 (en) 2002-04-17 2004-04-06 Hewlett-Packard Development Company, L.P. Atmospheric control within a building
US7023167B2 (en) * 2002-05-02 2006-04-04 Smith Otto J M Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit a starting capacitor and a resistive element
US20080041081A1 (en) * 2006-08-15 2008-02-21 Bristol Compressors, Inc. System and method for compressor capacity modulation in a heat pump
US7628028B2 (en) * 2005-08-03 2009-12-08 Bristol Compressors International, Inc. System and method for compressor capacity modulation
US20070227177A1 (en) * 2006-04-04 2007-10-04 Eduardo Leon Air mover cover for a direct current air conditioning system
US20070227178A1 (en) * 2006-04-04 2007-10-04 Eduardo Leon Evaporator shroud and assembly for a direct current air conditioning system
US20070227168A1 (en) * 2006-04-04 2007-10-04 Simmons Bryan D Variable capacity air conditioning system
US20070227181A1 (en) * 2006-04-04 2007-10-04 Eduardo Leon Condenser shroud assembly for a direct current air conditioning system
JP2008064439A (ja) * 2006-09-11 2008-03-21 Daikin Ind Ltd 空気調和装置
JP2010507770A (ja) * 2006-09-18 2010-03-11 キャリア コーポレイション 膨張装置バイパスを有する冷凍システム
US20080302117A1 (en) * 2007-06-11 2008-12-11 Glacier Bay, Inc. Air conditioning system
US8904814B2 (en) * 2008-06-29 2014-12-09 Bristol Compressors, International Inc. System and method for detecting a fault condition in a compressor
WO2010036540A1 (en) * 2008-09-29 2010-04-01 Carrier Corporation Capacity boosting during pulldown
US20100204838A1 (en) * 2009-02-12 2010-08-12 Liebert Corporation Energy efficient air conditioning system and method utilizing variable capacity compressor and sensible heat ratio load matching
US8601828B2 (en) 2009-04-29 2013-12-10 Bristol Compressors International, Inc. Capacity control systems and methods for a compressor
US8011191B2 (en) 2009-09-30 2011-09-06 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
WO2011130162A2 (en) 2010-04-12 2011-10-20 Drexel University Heat pump water heater
US10473344B2 (en) 2011-03-10 2019-11-12 Carrier Corporation Electric re-heat dehumidification
US9316424B2 (en) 2011-04-19 2016-04-19 Liebert Corporation Multi-stage cooling system with tandem compressors and optimized control of sensible cooling and dehumidification
US9845981B2 (en) 2011-04-19 2017-12-19 Liebert Corporation Load estimator for control of vapor compression cooling system with pumped refrigerant economization
US9038404B2 (en) 2011-04-19 2015-05-26 Liebert Corporation High efficiency cooling system
US10663500B2 (en) 2011-07-25 2020-05-26 Clean Power Research, L.L.C. System and method for estimating photovoltaic energy generation through linearly interpolated irradiance observations with the aid of a digital computer
US8165812B2 (en) 2011-07-25 2012-04-24 Clean Power Research, L.L.C. Computer-implemented system and method for estimating power data for a photovoltaic power generation fleet
US11068563B2 (en) 2011-07-25 2021-07-20 Clean Power Research, L.L.C. System and method for normalized ratio-based forecasting of photovoltaic power generation system degradation with the aid of a digital computer
US10140401B1 (en) 2011-07-25 2018-11-27 Clean Power Research, L.L.C. System and method for inferring a photovoltaic system configuration specification with the aid of a digital computer
US10599747B1 (en) 2011-07-25 2020-03-24 Clean Power Research, L.L.C. System and method for forecasting photovoltaic power generation system degradation
US9645180B1 (en) 2011-07-25 2017-05-09 Clean Power Research, L.L.C. System and method for estimating photovoltaic energy generation for use in photovoltaic fleet operation with the aid of a digital computer
US9880230B1 (en) 2011-07-25 2018-01-30 Clean Power Research, L.L.C. System and method for inferring operational specifications of a photovoltaic power generation system using net load with the aid of a digital computer
US9411073B1 (en) 2011-07-25 2016-08-09 Clean Power Research, L.L.C. Computer-implemented system and method for correlating satellite imagery for use in photovoltaic fleet output estimation
US10797639B1 (en) * 2011-07-25 2020-10-06 Clean Power Research, L.L.C. System and method for performing power utility remote consumer energy auditing with the aid of a digital computer
EP2589899B1 (de) 2011-11-03 2019-10-23 Siemens Schweiz AG Verfahren zur Erhöhung der Ventilkapazität einer Kältemaschine
US10409925B1 (en) 2012-10-17 2019-09-10 Clean Power Research, L.L.C. Method for tuning photovoltaic power generation plant forecasting with the aid of a digital computer
US10789396B1 (en) * 2014-02-03 2020-09-29 Clean Power Research, L.L.C. Computer-implemented system and method for facilitating implementation of holistic zero net energy consumption
US10024733B1 (en) * 2014-02-03 2018-07-17 Clean Power Research, L.L.C. Apparatus and method for empirically estimating overall thermal performance of a building with the aid of a digital computer
US10747914B1 (en) 2014-02-03 2020-08-18 Clean Power Research, L.L.C. Computer-implemented system and method for estimating electric baseload consumption using net load data
US10719636B1 (en) * 2014-02-03 2020-07-21 Clean Power Research, L.L.C. Computer-implemented system and method for estimating gross energy load of a building
US10339232B1 (en) 2015-02-25 2019-07-02 Clean Power Research, L.L.C. Computer-implemented system and method for modeling building heating energy consumption
US10332021B1 (en) 2015-02-25 2019-06-25 Clean Power Research, L.L.C. System and method for estimating indoor temperature time series data of a building with the aid of a digital computer
US10156554B1 (en) 2015-02-25 2018-12-18 Clean Power Research, L.L.C. System and method for determining infiltration of a building through empirical testing using a CO2 concentration monitoring device
US11921478B2 (en) * 2015-02-25 2024-03-05 Clean Power Research, L.L.C. System and method for estimating periodic fuel consumption for cooling of a building with the aid of a digital computer
US10203674B1 (en) 2015-02-25 2019-02-12 Clean Power Research, L.L.C. System and method for providing constraint-based heating, ventilation and air-conditioning (HVAC) system optimization with the aid of a digital computer
KR102403512B1 (ko) 2015-04-30 2022-05-31 삼성전자주식회사 공기 조화기의 실외기, 이에 적용되는 컨트롤 장치
US10359206B1 (en) 2016-11-03 2019-07-23 Clean Power Research, L.L.C. System and method for forecasting seasonal fuel consumption for indoor thermal conditioning with the aid of a digital computer
US10653042B2 (en) 2016-11-11 2020-05-12 Stulz Air Technology Systems, Inc. Dual mass cooling precision system
US10989455B1 (en) 2017-12-13 2021-04-27 Mainstream Engineering Corporation Integrated hybrid thermostatic expansion valve and method for providing uniform cooling of heat generating devices
US11423199B1 (en) 2018-07-11 2022-08-23 Clean Power Research, L.L.C. System and method for determining post-modification building balance point temperature with the aid of a digital computer
US11549606B2 (en) * 2018-11-28 2023-01-10 Mahle International Gmbh Pilot-pressure-controlled flow valve and fluid system containing same

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB181007A (en) * 1921-05-30 1923-07-19 Escher Wyss Maschf Ag Improvements relating to refrigerating installations with rotary compressors
FR680807A (fr) * 1928-09-06 1930-05-06 Brown Réglage automatique d'une installation frigorifique avec compresseur centrifuge
US2053945A (en) * 1934-04-18 1936-09-08 Gen Motors Corp Refrigerating apparatus
US2323408A (en) * 1935-11-18 1943-07-06 Honeywell Regulator Co Air conditioning system
US2112039A (en) * 1936-05-05 1938-03-22 Gen Electric Air conditioning system
US2244312A (en) * 1938-03-31 1941-06-03 Honeywell Regulator Co Refrigeration system
US2252300A (en) * 1938-05-07 1941-08-12 Honeywell Regulator Co Refrigeration system
US2332981A (en) * 1939-12-16 1943-10-26 B F Sturtevant Co Variable surface evaporator
US2306534A (en) * 1940-04-30 1942-12-29 Anthony F Hoesel Refrigerating system
US2350408A (en) * 1941-05-28 1944-06-06 Honeywell Regulator Co Direct expansion air conditioning control system
US2379286A (en) * 1943-05-24 1945-06-26 Gen Electric Refrigerating system
US2669849A (en) * 1947-10-09 1954-02-23 Sporlan Valve Co Inc Refrigerant flow control
US2583178A (en) * 1948-10-21 1952-01-22 Honeywell Regulator Co Refrigeration control apparatus
US3133424A (en) * 1962-11-29 1964-05-19 Westinghouse Electric Corp Controls for heat pumps having air exposed outdoor air coils
US3355906A (en) * 1965-11-08 1967-12-05 Borg Warner Refrigeration system including control for varying compressor speed
US3371500A (en) * 1966-05-13 1968-03-05 Trane Co Refrigeration system starting
US3388559A (en) * 1966-12-13 1968-06-18 Westinghouse Electric Corp Electric motors cooled with refrigerants
US3449922A (en) * 1967-02-01 1969-06-17 John D Ruff Centrifugal compressor and wide range of capacity variation
US3434299A (en) * 1967-03-06 1969-03-25 Larkin Coils Inc Evaporator control with constant pressure expansion valve and bypass means
US3446032A (en) * 1967-03-10 1969-05-27 Edward W Bottum Heat exchanger
US3537272A (en) * 1968-08-22 1970-11-03 Hall Thermotank Intern Ltd Expansion valve control including plural sensors
US3559422A (en) * 1968-12-09 1971-02-02 Holzer Patent Ag Means for regulating the temperature of refrigerators
US3499297A (en) * 1969-02-20 1970-03-10 John D Ruff Variable capacity refrigeration system
US3563055A (en) * 1969-03-17 1971-02-16 Sporlan Valve Co Refrrigerant distribvtor
US3584279A (en) * 1969-05-28 1971-06-08 Borg Warner Motor control system with volts/hertz regulation
US3577743A (en) * 1969-06-10 1971-05-04 Vilter Manufacturing Corp Control for refrigeration systems
US3638446A (en) * 1969-06-27 1972-02-01 Robert T Palmer Low ambient control of subcooling control valve
US3735603A (en) * 1971-08-12 1973-05-29 Dunham Bush Inc Liquid refrigerant feed control
US3742722A (en) * 1972-02-08 1973-07-03 Spartan Valve Co Thermostatic expansion valve for refrigeration systems
US3914952A (en) * 1972-06-26 1975-10-28 Sparlan Valve Company Valve control means and refrigeration systems therefor
US3866439A (en) * 1973-08-02 1975-02-18 Carrier Corp Evaporator with intertwined circuits
DK141670C (da) * 1973-08-13 1980-10-20 Danfoss As Termostatisk ekspansionsventil til koeleanlaeg
US3952533A (en) * 1974-09-03 1976-04-27 Kysor Industrial Corporation Multiple valve refrigeration system
DE2553831A1 (de) * 1974-12-13 1976-06-16 Stal Refrigeration Ab Anlage fuer kuehl- oder heizzwecke
US3977205A (en) * 1975-03-07 1976-08-31 Dravo Corporation Refrigerant mass flow control at low ambient temperatures
US4006603A (en) * 1975-06-13 1977-02-08 Vapor Corporation Air conditioning system for a railway vehicle
US4161106A (en) * 1977-02-28 1979-07-17 Water Chemists, Inc. Apparatus and method for determining energy waste in refrigeration units
US4362027A (en) * 1977-12-30 1982-12-07 Sporlan Valve Company Refrigeration control system for modulating electrically-operated expansion valves
US4282719A (en) * 1979-09-12 1981-08-11 Borg-Warner Corporation Control system for regulating large capacity rotating machinery
US4257238A (en) * 1979-09-28 1981-03-24 Borg-Warner Corporation Microcomputer control for an inverter-driven heat pump
JPS588956A (ja) * 1981-07-10 1983-01-19 株式会社システム・ホ−ムズ ヒ−トポンプ式冷暖房装置

Also Published As

Publication number Publication date
PH22482A (en) 1988-09-12
DE148108T1 (de) 1985-10-10
KR930004380B1 (ko) 1993-05-27
CA1235584A (en) 1988-04-26
AU3712984A (en) 1986-07-03
KR850004324A (ko) 1985-07-11
EP0148108A3 (en) 1987-06-03
AU569766B2 (en) 1988-02-18
US5177972A (en) 1993-01-12
EP0148108A2 (en) 1985-07-10

Similar Documents

Publication Publication Date Title
ZA8410041B (en) Energy efficient air conditioning system utilizing a variable speed compressor and integrally-related expansion valves
GB2095341B (en) Actuator system for compressor variable vanes and air bleed valve
AU538806B2 (en) Refrigeration and air conditioning systems
GB8321651D0 (en) Temperature control in air cycle refrigeration systems
GB2215833B (en) Indirect air conditioning system
DE3363665D1 (en) Variable-displacement rotary fluid compressor and air conditioning system using the compressor
MX157992A (es) Mejoras en compresor refrigerante de sistema de acondicionador de aire
GB2153511B (en) High efficiency air cycle air conditioning system
MX160405A (es) Mejoras en sistema de control para un compresor de capacidad variable en una instalacion de aire acondicionado
GB2285676B (en) Air conditioning and refrigeration system and method utilizing a cryogen
IL86606A0 (en) Air outlets in air conditioning systems
GB2153512B (en) High efficiency air cycle air conditioning system
EP0159861A3 (en) Variable air volume air conditioning system
GB9000358D0 (en) Air conditioning system and operating method
GB8824549D0 (en) Air conditioning compressor
AU560259B2 (en) Heat pump type air conditioning apparatus having a controlled variable capacity compressor
AU7157891A (en) Gas expansion motor air conditioning system
GB2142137B (en) Air conditioning systems
GB2167178B (en) Air conditioner system in a building
GB8527140D0 (en) Air conditioning systems
GB2244804B (en) Air conditioning system and method
GB2125114B (en) Air compressor and air pressure system
IL103824A0 (en) Liquid ring compressor/turbine and air conditioning systems utilizing same
GB2223088B (en) Gas refrigeration or air conditioning device
GB8418014D0 (en) Controlling air conditioning plants in buildings