US2975609A - Air conditioning - Google Patents

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Publication number
US2975609A
US2975609A US600836A US60083656A US2975609A US 2975609 A US2975609 A US 2975609A US 600836 A US600836 A US 600836A US 60083656 A US60083656 A US 60083656A US 2975609 A US2975609 A US 2975609A
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Prior art keywords
air
dewpoint
cooling
room
temperature
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Expired - Lifetime
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US600836A
Inventor
Allander Claes
Lunden Bror
Nilsson Karl
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/147—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with both heat and humidity transfer between supplied and exhausted air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/153—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/21—Evaporators where refrigerant covers heat exchange coil

Definitions

  • the present invention is mainly characterized in that the outdoor air irst is dehumidiiied to such a degree that its dewpoint will be below the dewpoint of the room air and that of the atmosphere surrounding the cool distributing pipes respectively and then before its distribution is reheated, in order to eliminate the risk of condensation on the pipes and make it possible to use single- Wall pipes without any insulation.
  • the dewpoint of the primary air is sufficiently low that the mixture of primary and secondary air has a dewpoint below the temperature of the cooling coils so that the separate cooling coils in the room units need not be provided with draining means for condensed water. At the same time it is also possible to gain the feature of a greater cooling capacity of the system as transmission losses in the distributing pipes can be eliminated.
  • FIG. 1 designates a cooling machine, for instance using Freon as cooling medium.
  • 2 designates the condenser of the cooling machine and 3 and 4 designate the evaporator of the cooling system, the coils Within condenser 2 and cooling machine 3 being connected through an expansion valve 2a of any preferred conventional construction, which expansion valve forms no part of the present invention.
  • At the point 5 is supplied warm, moist outdoor air, which is cooled and dehumidied in the part 4 of the evaporator.
  • the air is then conducted through the condenser 2 and through the pipe system 6 to the different supply points (the room units 7).
  • the temperature of the air is adjusted before being with a fluid, for instance water.
  • This water for cooling purpose may be supplied through the pipe system 8 from the part 3 of the evaporator, but can of course also be taken from a separate source or from the main supply line for water.
  • the apparatus will function in the following manner.
  • the air supplied at the point 5 is cooled and dehumidied in the evaporator 4 to such a degree that its dewpoint will be below the dewpoint in the rooms, to which the air is to be distributed and below the dewpoint of the air surrounding the distributing pipes.
  • This may be done by suitable controls, for example dewpoint thermostats 1l, 12 and 13 operating a damper A14 controlling a bypass through the evaporator 4.
  • the particular controls illustrated in the drawing do not form a part of the present invention.
  • the air is then conducted to the condenser 2 Where it is heated to such a degree that there is no risk for water drops due to condensation on the pipes.
  • the apparatus can be varied in diierent ways within the scope of the invention. Thus it is not necessary to use a cooling device for the cooling, dehumidifying and reheating of the air.
  • the cooling and dehumidifying of the air can for instance be performed by means of cool underground water and the reheating of said air can be performed by means of heated water.
  • the improvement comprising the step of cooling and dehumidifying the outdoor air in the central air conditioning plant to such a degree that its dewpoint is below the dewpoint of the atmosphere surrounding said distributing duct system and also suthciently lower than the dewpoint of the recirculated air in each room unit to insure that the dewpoint of the mixed air will be lbelow the temperature of the heat exchange medium used in said room units.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Solid Materials (AREA)
  • Central Air Conditioning (AREA)

Description

March 2l, 1961 c. ALLANDER ETAL 2,975,609
AIR CONDITIONING Filed July 30, 1956 INVENTOIRSI CLAES ALLANDER BROR LUNDEN KARL NILSSON AT'TYS United States Patent AIR CONDITEGNENG Claes Allander, Sodra Angby, and Bror Lunden and Karl Nilsson, Bromma, Sweden, assignors to AB Svenska Flaktfabrilren, Stockholm, Sweden, a corporation of Sweden The present invention relates to a new and improved method for conditioning the Ventilating air for rooms and similar spaces.
According to a known method it has hitherto been usual to cool and dehumidify outdoor air, having relatively high temperature and humidity, to a certain degree in a central air conditioning plant, from which plant said air then is distributed to the different rooms to be conditioned. At each distributing point there is arranged a room unit provided with cooling coils for the cooling of a mixture of primary pre-conditioned outdoor air and secondary recirculated room air to a desired room temperature. According to this method the outdoor air is cooled to a saturated state and said outdoor air having the dewpoint temperature is then distributed through a pipe system to the different rooms. As the temperature of the cooled air in this case will be below the dewpoint of the room to be conditioned and also will be below the dewpoint of the building elements surrounding the distributing pipe system for the cooled air, it has been necessaryin order to avoid condensation on the distributing pipesto use pipes with double walls (jacketed pipes) and with intermediate insulation. According to this method it has also been necessary to equip the cooling coils in the different room units with draining means to remove Iwater condensed in the room units.
The present invention is mainly characterized in that the outdoor air irst is dehumidiiied to such a degree that its dewpoint will be below the dewpoint of the room air and that of the atmosphere surrounding the cool distributing pipes respectively and then before its distribution is reheated, in order to eliminate the risk of condensation on the pipes and make it possible to use single- Wall pipes without any insulation. The dewpoint of the primary air is sufficiently low that the mixture of primary and secondary air has a dewpoint below the temperature of the cooling coils so that the separate cooling coils in the room units need not be provided with draining means for condensed water. At the same time it is also possible to gain the feature of a greater cooling capacity of the system as transmission losses in the distributing pipes can be eliminated.
The invention will now be described more in detail V with reference to the drawing showing by way of example an apparatus for the performance of the invented method.
In the drawing 1 designates a cooling machine, for instance using Freon as cooling medium. 2 designates the condenser of the cooling machine and 3 and 4 designate the evaporator of the cooling system, the coils Within condenser 2 and cooling machine 3 being connected through an expansion valve 2a of any preferred conventional construction, which expansion valve forms no part of the present invention. At the point 5 is supplied warm, moist outdoor air, which is cooled and dehumidied in the part 4 of the evaporator. The air is then conducted through the condenser 2 and through the pipe system 6 to the different supply points (the room units 7). Here the temperature of the air is adjusted before being with a fluid, for instance water.
supplied into each room by an indirect heat exchange This water for cooling purpose may be supplied through the pipe system 8 from the part 3 of the evaporator, but can of course also be taken from a separate source or from the main supply line for water.
The apparatus will function in the following manner. The air supplied at the point 5 is cooled and dehumidied in the evaporator 4 to such a degree that its dewpoint will be below the dewpoint in the rooms, to which the air is to be distributed and below the dewpoint of the air surrounding the distributing pipes. This may be done by suitable controls, for example dewpoint thermostats 1l, 12 and 13 operating a damper A14 controlling a bypass through the evaporator 4. The particular controls illustrated in the drawing do not form a part of the present invention. The air is then conducted to the condenser 2 Where it is heated to such a degree that there is no risk for water drops due to condensation on the pipes. This may be done by a thermostat 15 cooperable with the dewpoint thermostat 12 to operate a damper 16 controlling a bypass through the condenser 2. The particular controls illustrated in the drawing do not form a part of the present invention. Through the pipe system 6 the air is then conducted to the room units where the temperature of the air after its mixing with air from the room as indicated at 18 is adjusted to a suitable temperature by means of a valve 19 controlling a heat exchanger 20 using the uid transported in the pipe system 8.
The apparatus can be varied in diierent ways within the scope of the invention. Thus it is not necessary to use a cooling device for the cooling, dehumidifying and reheating of the air. The cooling and dehumidifying of the air can for instance be performed by means of cool underground water and the reheating of said air can be performed by means of heated water.
What we claim is:
In the method of air conditioning a plurality of rooms and similar enclosed areas comprising the steps of pretreating outdoor air in a central air conditioning plant by cooling and dehumidfying the air, and then rehea-ting the air approximately to the temperature of the room air, distributing said pretreated air through a duct system to individual room units, mixing said air with recirculated room air and passing said mixed air over a heat exchanger disposed in each room unit to individually control the temperature of said mixed air to be discharged into the rooms, the improvement comprising the step of cooling and dehumidifying the outdoor air in the central air conditioning plant to such a degree that its dewpoint is below the dewpoint of the atmosphere surrounding said distributing duct system and also suthciently lower than the dewpoint of the recirculated air in each room unit to insure that the dewpoint of the mixed air will be lbelow the temperature of the heat exchange medium used in said room units.
References Cited in the tile of this patent UNITED STATES PATENTS 1,986,863 Terry Jan. 8, 1935 2,257,915 Newton Oct. 7, 1941 2,363,294 Carrier Nov. 21, 1944 2,500,695 McGrath Mar. 14, 1950 2,548,665 Grant Apr. 10, 1951 2,567,758 Ashley Sept. 1l, 1951 2,713,995 Arkoosh et al. July 26, 1955 OTHER REFERENCES Reheating by Means of Refrigerant Compressor Discharge Gas, by Nicoll; Heating Piping and Air Conditioning, December 1940, pages 7336-741.
US600836A 1955-08-01 1956-07-30 Air conditioning Expired - Lifetime US2975609A (en)

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151471A (en) * 1962-07-16 1964-10-06 W D Ind Ltd Air conditioning system for electronic instrument cabinets
US3247678A (en) * 1963-10-02 1966-04-26 John W Mohlman Air conditioning with ice-brine slurry
US3257818A (en) * 1964-07-28 1966-06-28 Carrier Corp Cooling system
US4094167A (en) * 1976-03-04 1978-06-13 Svenska Geotherm Aktiebolag Heat pump assembly
US4124998A (en) * 1976-02-03 1978-11-14 Canada Square Management Ltd. Air conditioning systems for buildings
WO1982003449A1 (en) * 1981-03-25 1982-10-14 Thomas H Hebert Precool/subcool system and condenser therefor
US4519217A (en) * 1983-01-04 1985-05-28 Hussmann Corporation Supermarket environmental control system
US4720983A (en) * 1986-11-17 1988-01-26 Shaker Tinning & Heating Co. Heater/cooler unit
US4984435A (en) * 1989-02-16 1991-01-15 Dairei Co. Ltd. Brine refrigerating apparatus
US4984433A (en) * 1989-09-26 1991-01-15 Worthington Donald J Air conditioning apparatus having variable sensible heat ratio
EP0703419A3 (en) * 1994-09-20 1997-05-07 Microtecnica Refrigeration system
US20070012060A1 (en) * 2005-07-13 2007-01-18 Everett Simons Refrigeration cycle dehumidifier
US20070120841A1 (en) * 2002-12-10 2007-05-31 Lg Electronics Inc. Video overlay device of mobile telecommunication terminal
US20080028776A1 (en) * 2005-11-16 2008-02-07 Bou-Matic Technologies Llc, A Nevada Corporation Enhanced Performance Dehumidifier
US20080223050A1 (en) * 2007-03-13 2008-09-18 Dri-Eaz Products, Inc. Dehumidification systems and methods for extracting moisture from water damaged structures
WO2009073036A1 (en) * 2007-12-07 2009-06-11 Carrier Corporation Air routing for simultaneous heating and cooling
US20100125367A1 (en) * 2008-11-17 2010-05-20 Dri-Eaz Products, Inc. Methods and systems for determining dehumidifier performance
US20100212334A1 (en) * 2005-11-16 2010-08-26 Technologies Holdings Corp. Enhanced Performance Dehumidification Apparatus, System and Method
US20100269526A1 (en) * 2009-04-27 2010-10-28 Robert Pendergrass Systems and methods for operating and monitoring dehumidifiers
US20100275630A1 (en) * 2005-11-16 2010-11-04 Technologies Holdings Corp. Defrost Bypass Dehumidifier
US20100326103A1 (en) * 2009-06-24 2010-12-30 Karcher North America, Inc. Dehumidifier for Use in Water Damage Restoration
USD634414S1 (en) 2010-04-27 2011-03-15 Dri-Eaz Products, Inc. Dehumidifier housing
US20110167670A1 (en) * 2010-01-08 2011-07-14 Karcher North America, Inc. Integrated Water Damage Restoration System, Sensors Therefor, and Method of Using Same
US8784529B2 (en) 2011-10-14 2014-07-22 Dri-Eaz Products, Inc. Dehumidifiers having improved heat exchange blocks and associated methods of use and manufacture
USD731632S1 (en) 2012-12-04 2015-06-09 Dri-Eaz Products, Inc. Compact dehumidifier
US9920951B2 (en) 2013-03-15 2018-03-20 Olive Tree Patents 1 Llc Thermal recovery system and method
US10793995B2 (en) * 2014-12-08 2020-10-06 Lg Electronics Inc. Condensing type clothes dryer having a heat pump cycle and a method for controlling a condensing type clothes dryer having a heat pump cycle
US10941958B2 (en) * 2019-03-18 2021-03-09 Lennox Industries Inc. HVAC systems with evaporator bypass and supply air recirculation and methods of using same
EP4206546A1 (en) * 2021-12-28 2023-07-05 Trane International Inc. Hvacr system with zone heating

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986863A (en) * 1932-11-30 1935-01-08 Westinghouse Electric & Mfg Co Cooling and dehumidifying system
US2257915A (en) * 1938-02-07 1941-10-07 Honeywell Regulator Co Air conditioning system
US2363294A (en) * 1939-08-12 1944-11-21 Carrier Corp Air conditioning system
US2500695A (en) * 1945-12-01 1950-03-14 Carrier Corp Air conditioning system
US2548665A (en) * 1948-03-11 1951-04-10 Carrier Corp Room cooling units embodying control to limit condensation
US2567758A (en) * 1945-12-01 1951-09-11 Carrier Corp Air-conditioning method
US2713995A (en) * 1951-05-14 1955-07-26 Wilkinson Mfg Company Air heating and cooling system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986863A (en) * 1932-11-30 1935-01-08 Westinghouse Electric & Mfg Co Cooling and dehumidifying system
US2257915A (en) * 1938-02-07 1941-10-07 Honeywell Regulator Co Air conditioning system
US2363294A (en) * 1939-08-12 1944-11-21 Carrier Corp Air conditioning system
US2500695A (en) * 1945-12-01 1950-03-14 Carrier Corp Air conditioning system
US2567758A (en) * 1945-12-01 1951-09-11 Carrier Corp Air-conditioning method
US2548665A (en) * 1948-03-11 1951-04-10 Carrier Corp Room cooling units embodying control to limit condensation
US2713995A (en) * 1951-05-14 1955-07-26 Wilkinson Mfg Company Air heating and cooling system

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151471A (en) * 1962-07-16 1964-10-06 W D Ind Ltd Air conditioning system for electronic instrument cabinets
US3247678A (en) * 1963-10-02 1966-04-26 John W Mohlman Air conditioning with ice-brine slurry
US3257818A (en) * 1964-07-28 1966-06-28 Carrier Corp Cooling system
US4124998A (en) * 1976-02-03 1978-11-14 Canada Square Management Ltd. Air conditioning systems for buildings
US4094167A (en) * 1976-03-04 1978-06-13 Svenska Geotherm Aktiebolag Heat pump assembly
US4373346A (en) * 1981-03-25 1983-02-15 Hebert Thomas H Precool/subcool system and condenser therefor
WO1982003449A1 (en) * 1981-03-25 1982-10-14 Thomas H Hebert Precool/subcool system and condenser therefor
US4519217A (en) * 1983-01-04 1985-05-28 Hussmann Corporation Supermarket environmental control system
US4720983A (en) * 1986-11-17 1988-01-26 Shaker Tinning & Heating Co. Heater/cooler unit
US4984435A (en) * 1989-02-16 1991-01-15 Dairei Co. Ltd. Brine refrigerating apparatus
US4984433A (en) * 1989-09-26 1991-01-15 Worthington Donald J Air conditioning apparatus having variable sensible heat ratio
EP0703419A3 (en) * 1994-09-20 1997-05-07 Microtecnica Refrigeration system
US20070120841A1 (en) * 2002-12-10 2007-05-31 Lg Electronics Inc. Video overlay device of mobile telecommunication terminal
US20070012060A1 (en) * 2005-07-13 2007-01-18 Everett Simons Refrigeration cycle dehumidifier
WO2007008948A1 (en) * 2005-07-13 2007-01-18 Everett Simons Refrigeration cycle dehumidifiers and related methods
US7779643B2 (en) 2005-07-13 2010-08-24 Everett Simons Refrigeration cycle dehumidifier
US20080028776A1 (en) * 2005-11-16 2008-02-07 Bou-Matic Technologies Llc, A Nevada Corporation Enhanced Performance Dehumidifier
US7540166B2 (en) 2005-11-16 2009-06-02 Technologies Holdings Corp. Enhanced performance dehumidifier
US8769969B2 (en) 2005-11-16 2014-07-08 Technologies Holdings Corp. Defrost bypass dehumidifier
US8347640B2 (en) 2005-11-16 2013-01-08 Technologies Holdings Corp. Enhanced performance dehumidification apparatus, system and method
US20100212334A1 (en) * 2005-11-16 2010-08-26 Technologies Holdings Corp. Enhanced Performance Dehumidification Apparatus, System and Method
US8316660B2 (en) 2005-11-16 2012-11-27 Technologies Holdings Corp. Defrost bypass dehumidifier
US20100275630A1 (en) * 2005-11-16 2010-11-04 Technologies Holdings Corp. Defrost Bypass Dehumidifier
US20080223050A1 (en) * 2007-03-13 2008-09-18 Dri-Eaz Products, Inc. Dehumidification systems and methods for extracting moisture from water damaged structures
US8122729B2 (en) 2007-03-13 2012-02-28 Dri-Eaz Products, Inc. Dehumidification systems and methods for extracting moisture from water damaged structures
US20100242509A1 (en) * 2007-12-07 2010-09-30 Alexander Lifson Air routing for simultaneous heating and cooling
CN101889181B (en) * 2007-12-07 2017-08-15 开利公司 For the air routing design for heating and cooling down simultaneously
WO2009073036A1 (en) * 2007-12-07 2009-06-11 Carrier Corporation Air routing for simultaneous heating and cooling
US8290742B2 (en) 2008-11-17 2012-10-16 Dri-Eaz Products, Inc. Methods and systems for determining dehumidifier performance
US20100125367A1 (en) * 2008-11-17 2010-05-20 Dri-Eaz Products, Inc. Methods and systems for determining dehumidifier performance
US20100269526A1 (en) * 2009-04-27 2010-10-28 Robert Pendergrass Systems and methods for operating and monitoring dehumidifiers
US8572994B2 (en) 2009-04-27 2013-11-05 Dri-Eaz Products, Inc. Systems and methods for operating and monitoring dehumidifiers
US9089814B2 (en) 2009-04-27 2015-07-28 Dri-Eaz Products, Inc. Systems and methods for operating and monitoring dehumidifiers
US20100326103A1 (en) * 2009-06-24 2010-12-30 Karcher North America, Inc. Dehumidifier for Use in Water Damage Restoration
US20110167670A1 (en) * 2010-01-08 2011-07-14 Karcher North America, Inc. Integrated Water Damage Restoration System, Sensors Therefor, and Method of Using Same
US8640360B2 (en) 2010-01-08 2014-02-04 Karcher North America, Inc. Integrated water damage restoration system, sensors therefor, and method of using same
USD634414S1 (en) 2010-04-27 2011-03-15 Dri-Eaz Products, Inc. Dehumidifier housing
US8784529B2 (en) 2011-10-14 2014-07-22 Dri-Eaz Products, Inc. Dehumidifiers having improved heat exchange blocks and associated methods of use and manufacture
USD731632S1 (en) 2012-12-04 2015-06-09 Dri-Eaz Products, Inc. Compact dehumidifier
US9920951B2 (en) 2013-03-15 2018-03-20 Olive Tree Patents 1 Llc Thermal recovery system and method
US10793995B2 (en) * 2014-12-08 2020-10-06 Lg Electronics Inc. Condensing type clothes dryer having a heat pump cycle and a method for controlling a condensing type clothes dryer having a heat pump cycle
US10941958B2 (en) * 2019-03-18 2021-03-09 Lennox Industries Inc. HVAC systems with evaporator bypass and supply air recirculation and methods of using same
US11549714B2 (en) 2019-03-18 2023-01-10 Lennox Industries Inc. HVAC systems with evaporator bypass and supply air recirculation and methods of using same
US11859849B2 (en) 2019-03-18 2024-01-02 Lennox Industries Inc. HVAC systems with evaporator bypass and supply air recirculation and methods of using same
EP4206546A1 (en) * 2021-12-28 2023-07-05 Trane International Inc. Hvacr system with zone heating
US12123603B2 (en) 2021-12-28 2024-10-22 Trane International Inc. HVACR system with zone heating

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Publication number Publication date
FR1155278A (en) 1958-04-24
CH346680A (en) 1960-05-31

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