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US3360031A - Method for air-conditioning a plurality of rooms - Google Patents

Method for air-conditioning a plurality of rooms Download PDF

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Publication number
US3360031A
US3360031A US422882A US42288264A US3360031A US 3360031 A US3360031 A US 3360031A US 422882 A US422882 A US 422882A US 42288264 A US42288264 A US 42288264A US 3360031 A US3360031 A US 3360031A
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US
United States
Prior art keywords
air
temperature
heat
medium
secondary air
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US422882A
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English (en)
Inventor
Matts Sigvard
Grudeborn Lars-Owe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
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 Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Application granted granted Critical
Publication of US3360031A publication Critical patent/US3360031A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24F3/02—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 pressure or velocity of the primary air
    • F24F3/04—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 pressure or velocity of the primary air operating with high pressure or high velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F3/06—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 arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units

Definitions

  • ABSTRACT OF THE DISCLOSURE An air conditioning system consisting of a central conditioner for supplying conditioned primary air to each of a plurality of rooms, and individual room units for intermixing with said primary air, secondary air from the rooms, the temperature of the secondary air being reduced by a liquid heat exchange medium prior to mixing with the primary air in the room unit.
  • the temperature of the liquid heat exchange medium is maintained within a specified range either by adding hot or cold medium or by heat exchange with the primary air in the central conditioning unit.
  • the present invention relates to a method for air-conditioning a plurality of rooms by means of air delivered from one or more central air-conditioning apparatus, which air is transported to and distributed into induction units in the various rooms as primary air in a quantity substantially corresponding to the need of ventilation and which by ejection effect induces and is intermixed with a certain quantity of local or secondary air.
  • the temperature of the secondary air before its mixing with the primary air is regulated in heat exchangers disposed in the induction units.
  • the buildings which were erected only a few years ago, Were constructed in a very traditional manner, i.e. the outer walls were most often supporting parts and consisted of heavy material, for instance bricks.
  • the window surface of the fronts was small, often not more than 15% of the total front surface.
  • the inner walls were made as supporting walls with, for instance, bricks or hollow concrete blocks, and the floorings were made relatively strong. This resulted in that the heat which in one way or another was supplied to the buildings not used to make up the transmission losses was stored in the building material.
  • the heat-storing capacity of the buildings could often be sufficiently great that no additional heat for nightly heating was necessary.
  • the air-conditioning plants of the buildings were most often started early in the morning or Wereif necessaryin operation all night long in order to utilize the cooler night-air and in this way to cool down the buildings to a suitable working temperature during daytime.
  • a disadvantage of this system is that if a person in any room wants to increase or decrease the temperature of the supplied air, he is not able to know beforehand in which direction the control knob for the capacity regulation is to be turned in order to obtain a desired result, as he does not know, of a heating or a cooling medium at the moment is passing through the system.
  • Another disadvantage is that the size of the range of available regulation is dependent on the temperature difference between the water in the heat exchangers and the room air and, in the case when the water temperature has become equal to the room temperature, the possibility for adjustment is non-existent.
  • the invention is characterized in th-at irrespective of the outdoor condition and the season (temperature and sun)the liquid medium, normally water, supplied to the heat exchangers of the induction unitsis maintained at a temperature common for substantially the whole plant and being lower than the temperature of the secondary air.
  • the temperature of the primary air is regulated in accordance with the outdoor condition (temperature and sun).
  • Another advantage is that no so-called zone division of the circulating system for the liquid medium has been necessary to accommodate the temperature of the medium to the orientation of the different parts of the building with respect to the points of the compass and sun conditions.
  • the ventilating air (the primary air) can suitably be supplied with an overtemperature in accordance with the outdoor conditions (temperature and sun radiation).
  • the circulating water may according to a suitable embodiment be utilized for a central pre-heating of the primary air. This is performed by conducting the medium heated in the heat exchangers of the induction units through one or more heat exchangers included in the central air-conditioning apparatus, through which heat exchanger(s) the primary air is taken in.
  • the medium supplied to these heat exchangers should be maintained at a temperature, which is not substantially below the dew-point temperature of the room-air (the secondary air). This is accomplished by introducing, when required, a suitable quantity of heat from a separate heat source into the closed circulation circuit, of the liquid heat-exchange medium.
  • the above-mentioned governing of the temperature of the heat-exchange medium may suitably be obtained by adding a suitable quantity of Warm or cold medium.
  • the heated medium is supplied to the circuit at a supply point located in the return pipe from the induction units and before the heat exchanger(s) located in the central apparatus simultaneously as a corresponding medium quantity is discharged from the circuit at a point located in the return pipe from the induction units upstream of the above-mentioned supply point.
  • the cooled medium is supplied to the circuit at a supply point located in the supply pipe to the induction units simultaneously as a corresponding medium quantity is discharged from the circuit at a point located in the supply pipe to the induction units upstream of the last-mentioned supply point.
  • the advantage of pre-heating the incoming primary air while simultaneously cooling the return medium from the heat exchangers of the induction units by the heat exchanger(s) disposed in the central apparatus is no longer available when the outdoor temperature is equal to or higher than the temperature of the circulating medium. In such cases it is desirable to re-circulate the medium coming from the induction units by by-passing the medium immediately to the induction units without first conducting the medium through the heat exchanger( s) in the central air-conditioning apparatus.
  • a suitable embodiment of the invention is characterized in that the heat exchanger(s) in the central airconditioning apparatus in certain cases (during summer) is (are) utilized for cooling and dehumidifying the ventilating air (the primary air).
  • FIGS. 1 to inclusive a number of exemplifying embodiments of a plant, wherein the invented method is used.
  • each figure illustrates an air conditioning plant for buildings having a number of heat exchangers 1 included in the induction units of the plant and a heat exchanger 2 belonging to the central air conditioning apparatus of the plant (not shown) which regulates the temperature of the ventilating primary in ac cordance with the outside conditions, as influenced by the temperature and sun.
  • 3 designates a pipe line which together with the members 1 and 2 constitutes a closed circulation circuit for a liquid medium.
  • a circulation pump 4. 5 designates a flow of ventilating air through the heat exchanger 2 for a central pre-heating of same.
  • FIG. 2 there is illustrated an arrangement for maintaining a constant liquid flow through the heat exchanger 2 by means of a separate pump 6 and aby-pass line 7-irrespective of the fact if one or more of the heat exchangers 1 should be entirely or partly shut-off.
  • FIG. 3 there is shown an arrangement by means of which a suitable quantity of warm medium from a separate heat source (not shown in the drawing) is added to the circulation circuit at 8 simultaneously as a corresponding quantity medium is discharged at 9-in order to maintain the medium supplied to the heat exchangers at a temperature not substantially below the dew-point-temperature of the room-air.
  • the control is eifected in a conventional manner by means of a thermostat 19 and a regulating valve 11.
  • FIG. 1 there is illustrated an arrangement for maintaining a constant liquid flow through the heat exchanger 2 by means of a separate pump 6 and aby-pass line 7-irrespective of the fact if one or more of the heat exchangers 1 should be entirely or partly shut-off.
  • FIG. 3 there is shown
  • FIG. 4 there is shown an arrangement by means of which a suitable quantity cold medium from a separate liquid cooler (not shown in the drawing) is added to the circulation circuit at 12 simultaneously as a corresponding medium quantity is discharged at 13-for the purpose of maintaining the medium supplied to the heat exchangers 1 at a pre-determined temperature lower than the temperature of the room-air.
  • This control is effected in a conventional manner by means of a thermostat 14 and a regulating valve 15.
  • the heated medium FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Central Air Conditioning (AREA)
  • Other Air-Conditioning Systems (AREA)
US422882A 1963-12-27 1964-12-28 Method for air-conditioning a plurality of rooms Expired - Lifetime US3360031A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1229763 1963-12-27
GB51927/64A GB1038020A (en) 1963-12-27 1964-12-21 A method of air-conditioning a plurality of rooms

Publications (1)

Publication Number Publication Date
US3360031A true US3360031A (en) 1967-12-26

Family

ID=26266960

Family Applications (1)

Application Number Title Priority Date Filing Date
US422882A Expired - Lifetime US3360031A (en) 1963-12-27 1964-12-28 Method for air-conditioning a plurality of rooms

Country Status (5)

Country Link
US (1) US3360031A (de)
BE (1) BE657581A (de)
DE (1) DE1263263B (de)
FR (1) FR1458942A (de)
GB (1) GB1038020A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645822A3 (de) * 2004-09-27 2007-09-05 KERMI GmbH Verfahren und Schnittstelleneinheit zum Zuführen und Abführen eines Kühlmediums zu und von einer Verbrauchereinheit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI124862B (fi) * 2008-05-06 2015-02-27 Fläkt Woods AB Menetelmä tuloilman jäähdyttämiseksi

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930593A (en) * 1957-07-05 1960-03-29 Borg Warner Air conditioning systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2363294A (en) * 1939-08-12 1944-11-21 Carrier Corp Air conditioning system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930593A (en) * 1957-07-05 1960-03-29 Borg Warner Air conditioning systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645822A3 (de) * 2004-09-27 2007-09-05 KERMI GmbH Verfahren und Schnittstelleneinheit zum Zuführen und Abführen eines Kühlmediums zu und von einer Verbrauchereinheit

Also Published As

Publication number Publication date
GB1038020A (en) 1966-08-03
BE657581A (de) 1965-04-16
FR1458942A (fr) 1966-04-29
DE1263263B (de) 1968-03-14

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