EP1344989B1 - Air conditioning apparatus - Google Patents
Air conditioning apparatus Download PDFInfo
- Publication number
- EP1344989B1 EP1344989B1 EP02251748A EP02251748A EP1344989B1 EP 1344989 B1 EP1344989 B1 EP 1344989B1 EP 02251748 A EP02251748 A EP 02251748A EP 02251748 A EP02251748 A EP 02251748A EP 1344989 B1 EP1344989 B1 EP 1344989B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating unit
- unit
- air flow
- cooling
- 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
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
Definitions
- the present invention relates to air conditioning apparatus and more particularly to air conditioning apparatus in which air may be heated or cooled depending on operational requirements.
- the cooling unit is constituted by a cooling coil which is connected to a source of refrigerant.
- the heater typically, may be an electric heater.
- the cooling unit or the heating unit may be operated as appropriate to give the desired air conditions.
- an air conditioning apparatus as claimed in claim 1.
- the apparatus comprises a cooling unit, a heating unit and a fan for directing air through the heating and cooling units wherein the heating unit is movable between first and second positions, the heating unit presenting a lower resistance to air flow through the apparatus in its second position.
- the heating unit is moveable to a position in which it provides a lower resistance to a flow of air through the apparatus.
- the heating unit can be moved to the second position so that the pressure drop across the heater is reduced or eliminated. This means that the cooling capacity of the cooling unit is improved, or a smaller fan unit can be used for a given cooling requirement, leading to energy savings.
- the heating unit may be withdrawn to a position outside an air flow passage, so as completely to eliminate its resistance to air flow.
- this arrangement may lead to additional space requirements. Accordingly, the heating unit is moveable between respective positions within the air flow passage.
- the heating unit may be moved to lie flush with a wall of the air flow passage.
- the heating unit is moveable to a position within the air flow passage in which it presents less resistance to the air flow.
- the heating unit may be mounted for translational, for example linear, movement in an arrangement that is not in accordance with the present invention.
- the heating unit is mounted for pivotal or rotary movement. Therefore the heating unit may has an axis of rotation extending, for example horizontally, through the air flow passage whereby in one position it may extend substantially across the air flow passage and in the other position it extends generally along the air flow passage, thereby providing less resistance to air flow.
- the movement of the heater may be effected by any suitable actuator, preferably a linear actuator coupled to the heater unit by a suitably rotary coupling, for example a rack and pinion coupling.
- the actuator is a thermoactuator.
- such actuators comprise a PTC heater which, when energised, heats a wax motor. The wax then expands so as to impart a movement to an actuator member.
- the heating unit is an electric heating unit.
- the heating unit may typically comprise a heating element supported in a frame, and the frame is mounted for movement in the air flow passage.
- the heating unit may be positioned upstream of the cooling unit, but preferably it is positioned downstream of the cooling unit.
- the cooling unit and fan may be of a conventional design.
- the cooling unit may comprise a cooling coil supplied with refrigerant through which the air flows.
- the fan may be of any suitable construction, for example an axial flow fan. Preferably, however, it is a centrifugal fan.
- the fan may be positioned in any convenient location, for example upstream of the cooling unit. Preferably, however, it is located between the cooling unit and the heating unit.
- an air conditioning unit 2 comprises a housing 4, having an air inlet 6 and an air outlet 8.
- An airflow passage 10 extends through the housing 4 from the air inlet 6 to the air outlet 8. The airflow is represented schematically by arrows in the passage 10.
- an air filter 12 Arranged within the airflow passage 10 in a serial flow manner are an air filter 12, a cooling unit 14, a centrifugal fan 16 and a heating unit 18.
- the cooling unit 14 is of a type conventional in the art, comprising a plurality of pipes connected to a source of refrigerant (not shown). As air is drawn through the cooling unit 14 by the fan 16 heat is transferred from the air to the refrigerant in the cooling unit 14, thereby cooling the air.
- the cooled air then passes through the centrifugal fan 16 which exhausts the air through the heater 18.
- the heater 18 is an electric heater. As can be seen most clearly from Figure 3 , the heater 18 is generally rectangular and comprises a plurality of heating elements 22 over which air is passed. The heater 18 is supported in a frame 20. Power is supplied to the elements 22 via electrical connectors 24 mounted on one side of the frame 20. Power is supplied to the connectors through wires 26.
- the frame 20 is pivotally mounted to a section 28 of the wall of the airflow passage 10.
- the wall section 28 may be removably mounted in the apparatus for ease of assembly.
- One end 30 of the frame is provided with an integrally formed L-shaped bracket 32 whose end is provided with an aperture 34.
- a further bracket 36 is upstanding from the passage wall section 28.
- the upper end of the bracket 36 mounts a journal 38 which extends through the opening 34 in the housing bracket 32 so as pivotally to support one end of the frame.
- the power supply wires 26 pass through the journal 38 and then through a grommet 40 mounted in the wall section 28 for connection to a control for the apparatus, not shown.
- a second integrally formed L-shaped bracket 42 is provided at the other end 44 of the heater frame 20.
- the distal end 46 of the bracket 42 is provided with two-spaced apart openings which receive respective pins 48 of a rotary coupling 50 of an actuator 52.
- the axes of rotation of the coupling 50 and the journal 38 are coincident, to define an axis of rotation 54 for the heater unit 18.
- the actuator 52 in this embodiment is a thermoactuator. It is of the type comprising a PTC heater which, when energised heats a wax motor. This substance expands, pushing out a rod 56 which is coupled to a rack and pinion rotary coupling 50. Actuators of this type are supplied by ELTEK SpA of Casale Monf., Italy under the product code 10.0331xx. In this way, linear motion of the rod 56 causes the pins 48 of the coupling 50 to rotate about axis 54, thereby rotating the heater unit 18.
- the actuator 52 and coupling 50 are supported on an angle bracket 58 which is mounted to the wall section 28.
- Wires 60 for the actuator extend through a grommet 62 in the wall section 28 for connection to the apparatus control.
- the top 64 of the frame 20 is provided with a yet further integrally formed mounting bracket 66.
- a thermal cut out 68 such as a bimetallic disc type cut out, is mounted on this bracket 66 so as to interrupt the power supply to the heating elements 22 in the event of the unit overheating.
- the heater 18 in the operative condition shown in Figure 1 , is arranged in a first position in which it is arranged generally vertically so as to extend across the airflow passage 10. This corresponds to the operative condition of the heater 18 as shown in Figure 3 . In this operative condition, the heater will be energised and air directed through the heater will be heated to an appropriate temperature and exhausted through the air outlet port 8. In this operative condition, the cooling unit 14 will normally be inoperative.
- the electric heater is de-energised and coolant circulated through the cooling unit 14.
- the actuator 52 is energised to rotate the heater 18 about its axis 54 by 90 ° to a second position in which it lies along the airflow passage 10, generally parallel to the air flow.
- the heating unit 18 presents a much reduced frontal area to the airflow, thereby reducing the resistance to airflow. Accordingly, there is a smaller pressure drop across the heater than would otherwise be the case. This means that in the cooling mode, the cooling capacity of the cooling unit 14 is increased or the fan 16 can be made smaller thereby reducing energy consumption.
- the heater 18 may be mounted in a different position in the airflow passage 10, and need not have a rotational axis extending across the centre of the passage - the axis could be displaced to or towards a side of the passage.
- a different type of actuator could be used.
- a different type of heater could also be used.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
- Air-Flow Control Members (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
Abstract
Description
- The present invention relates to air conditioning apparatus and more particularly to air conditioning apparatus in which air may be heated or cooled depending on operational requirements.
- Various air conditioning systems of the above type are known. In one such apparatus separate cooling and heating units are provided across which air is directed by means of a fan.
- Typically the cooling unit is constituted by a cooling coil which is connected to a source of refrigerant. The heater, typically, may be an electric heater. The cooling unit or the heating unit may be operated as appropriate to give the desired air conditions.
- In most operative conditions, the apparatus will be used to cool air, so the heating unit will be inoperative. However, air must still pass through the heating unit. The Applicants have recognised that this' is a potential problem since there is a drop in air pressure as the air passes through the heating unit. This means that the air flow through the apparatus as a whole is unnecessarily impeded, leading to a lower cooling capacity. A larger fan unit, requiring increased energy supply, is required to maintain cooling capacity.
JP 59 004839 - In accordance with the present invention, from a first aspect, there is provided an air conditioning apparatus as claimed in claim 1. In its preferred embodiments at least, the apparatus comprises a cooling unit, a heating unit and a fan for directing air through the heating and cooling units wherein the heating unit is movable between first and second positions, the heating unit presenting a lower resistance to air flow through the apparatus in its second position.
- The heating unit is moveable to a position in which it provides a lower resistance to a flow of air through the apparatus. Thus when the apparatus is to be used for cooling purposes, the heating unit can be moved to the second position so that the pressure drop across the heater is reduced or eliminated. This means that the cooling capacity of the cooling unit is improved, or a smaller fan unit can be used for a given cooling requirement, leading to energy savings.
- In one arrangement that is not in accordance with the present invention, the heating unit may be withdrawn to a position outside an air flow passage, so as completely to eliminate its resistance to air flow. However, this arrangement may lead to additional space requirements. Accordingly, the heating unit is moveable between respective positions within the air flow passage.
- In one arrangement, the heating unit may be moved to lie flush with a wall of the air flow passage. However, such an arrangement may be difficult to realise, so in accordance with the present invention the heating unit is moveable to a position within the air flow passage in which it presents less resistance to the air flow.
- The heating unit may be mounted for translational, for example linear, movement in an arrangement that is not in accordance with the present invention. In accordance with the present invention, the heating unit is mounted for pivotal or rotary movement. Therefore the heating unit may has an axis of rotation extending, for example horizontally, through the air flow passage whereby in one position it may extend substantially across the air flow passage and in the other position it extends generally along the air flow passage, thereby providing less resistance to air flow.
- The movement of the heater may be effected by any suitable actuator, preferably a linear actuator coupled to the heater unit by a suitably rotary coupling, for example a rack and pinion coupling. Preferably, the actuator is a thermoactuator. Typically such actuators comprise a PTC heater which, when energised, heats a wax motor. The wax then expands so as to impart a movement to an actuator member.
- In the preferred embodiment the heating unit is an electric heating unit. The heating unit may typically comprise a heating element supported in a frame, and the frame is mounted for movement in the air flow passage.
- The heating unit may be positioned upstream of the cooling unit, but preferably it is positioned downstream of the cooling unit.
- The cooling unit and fan may be of a conventional design. For example, the cooling unit may comprise a cooling coil supplied with refrigerant through which the air flows. The fan may be of any suitable construction, for example an axial flow fan. Preferably, however, it is a centrifugal fan. The fan may be positioned in any convenient location, for example upstream of the cooling unit. Preferably, however, it is located between the cooling unit and the heating unit.
- A preferred embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which:
-
Figure 1 shows, schematically, a side view of an embodiment of the invention in a first operative state; -
Figure 2 shows the apparatus ofFigure 1 in a second operative state; and -
Figure 3 shows the heating unit ofFigures 1 and 2 in greater detail. - With reference to
Figures 1 and 2 , anair conditioning unit 2 comprises ahousing 4, having anair inlet 6 and an air outlet 8. Anairflow passage 10 extends through thehousing 4 from theair inlet 6 to the air outlet 8. The airflow is represented schematically by arrows in thepassage 10. - Arranged within the
airflow passage 10 in a serial flow manner are anair filter 12, acooling unit 14, acentrifugal fan 16 and aheating unit 18. - The
cooling unit 14 is of a type conventional in the art, comprising a plurality of pipes connected to a source of refrigerant (not shown). As air is drawn through thecooling unit 14 by thefan 16 heat is transferred from the air to the refrigerant in thecooling unit 14, thereby cooling the air. - The cooled air then passes through the
centrifugal fan 16 which exhausts the air through theheater 18. - The
heater 18 is an electric heater. As can be seen most clearly fromFigure 3 , theheater 18 is generally rectangular and comprises a plurality ofheating elements 22 over which air is passed. Theheater 18 is supported in aframe 20. Power is supplied to theelements 22 viaelectrical connectors 24 mounted on one side of theframe 20. Power is supplied to the connectors throughwires 26. - The
frame 20 is pivotally mounted to asection 28 of the wall of theairflow passage 10. Thewall section 28 may be removably mounted in the apparatus for ease of assembly. - One
end 30 of the frame is provided with an integrally formed L-shaped bracket 32 whose end is provided with an aperture 34. Afurther bracket 36 is upstanding from thepassage wall section 28. The upper end of thebracket 36 mounts a journal 38 which extends through the opening 34 in thehousing bracket 32 so as pivotally to support one end of the frame. Thepower supply wires 26 pass through the journal 38 and then through agrommet 40 mounted in thewall section 28 for connection to a control for the apparatus, not shown. - A second integrally formed L-
shaped bracket 42 is provided at theother end 44 of theheater frame 20. Thedistal end 46 of thebracket 42 is provided with two-spaced apart openings which receive respective pins 48 of arotary coupling 50 of anactuator 52. The axes of rotation of thecoupling 50 and the journal 38 are coincident, to define an axis ofrotation 54 for theheater unit 18. - The
actuator 52 in this embodiment is a thermoactuator. It is of the type comprising a PTC heater which, when energised heats a wax motor. This substance expands, pushing out arod 56 which is coupled to a rack andpinion rotary coupling 50. Actuators of this type are supplied by ELTEK SpA of Casale Monf., Italy under the product code 10.0331xx. In this way, linear motion of therod 56 causes the pins 48 of thecoupling 50 to rotate aboutaxis 54, thereby rotating theheater unit 18. - The
actuator 52 andcoupling 50 are supported on anangle bracket 58 which is mounted to thewall section 28.Wires 60 for the actuator extend through agrommet 62 in thewall section 28 for connection to the apparatus control. - The top 64 of the
frame 20 is provided with a yet further integrally formed mountingbracket 66. A thermal cut out 68, such as a bimetallic disc type cut out, is mounted on thisbracket 66 so as to interrupt the power supply to theheating elements 22 in the event of the unit overheating. - Returning now to
Figures 1 and 2 , in the operative condition shown inFigure 1 , theheater 18 is arranged in a first position in which it is arranged generally vertically so as to extend across theairflow passage 10. This corresponds to the operative condition of theheater 18 as shown inFigure 3 . In this operative condition, the heater will be energised and air directed through the heater will be heated to an appropriate temperature and exhausted through the air outlet port 8. In this operative condition, the coolingunit 14 will normally be inoperative. - However, in a cooling mode of operation of the
apparatus 2, (as shown inFigure 2 ) the electric heater is de-energised and coolant circulated through the coolingunit 14. In this operative condition, theactuator 52 is energised to rotate theheater 18 about itsaxis 54 by 90° to a second position in which it lies along theairflow passage 10, generally parallel to the air flow. - In this operative condition, therefore, the
heating unit 18 presents a much reduced frontal area to the airflow, thereby reducing the resistance to airflow. Accordingly, there is a smaller pressure drop across the heater than would otherwise be the case. This means that in the cooling mode, the cooling capacity of the coolingunit 14 is increased or thefan 16 can be made smaller thereby reducing energy consumption. - It will be appreciated that various modifications can be made to the above described embodiment without departing from the scope of the invention as defined by the present claims. For example, the
heater 18 may be mounted in a different position in theairflow passage 10, and need not have a rotational axis extending across the centre of the passage - the axis could be displaced to or towards a side of the passage. Also, a different type of actuator could be used. A different type of heater could also be used.
Claims (11)
- Air conditioning apparatus (2) comprising a cooling unit (14), a heating unit (18) and a fan (16) for flowing air through the heating and cooling units, the heating unit mounted for pivotal or rotary movement characterised in that the heating unit (18) is movable between first and second positions within an air flow passage (10) of the apparatus (2), the heating unit having an axis of rotation (54) extending through the air flow passage, and the heating unit presenting a resistance to air flow through the air flow passage in its first and second positions, the resistance to air flow being less in its second position than in its first position.
- Apparatus (2) as claimed in claim 1 wherein in one position the heating unit (18) extends substantially across the air flow passage (10) and in the other position it extends generally along the air flow passage thereby providing the less resistance to air flow.
- Apparatus (2) as claimed in claim 1 or 2 wherein the axis of rotation (54) extends horizontally through the airflow passage (10).
- Apparatus (2) as claimed in claim 1, 2 or 3 comprising a linear actuator (52) and a rotary coupling (50) for movement of the heater unit (18).
- Apparatus (2) as claimed in claim 4 wherein the actuator (52) is a thermoactuator.
- Apparatus (2) as claimed in any preceding claim wherein the heating unit (18') is an electric heating unit.
- Apparatus (2) as claimed in claim 6 wherein the heating unit (18) comprises a heating element (22) supported in a frame (20), said frame being mounted for movement.
- Apparatus (2) as claimed in any preceding claim wherein the heating unit (18) is positioned downstream of the cooling unit (14).
- Apparatus (2) as claimed in any preceding claim wherein the cooling unit (14) comprises a cooling coil supplied with refrigerant.
- Apparatus (2) as claimed in any preceding claim wherein the fan (16) is a centrifugal fan.
- Apparatus (2) as claimed in any preceding claim wherein the fan (16) is located between the cooling unit (14) and the heating unit (18).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES02251748T ES2325149T3 (en) | 2002-03-12 | 2002-03-12 | AIR CONDITIONING DEVICE. |
AT02251748T ATE431528T1 (en) | 2002-03-12 | 2002-03-12 | AIR CONDITIONER |
EP02251748A EP1344989B1 (en) | 2002-03-12 | 2002-03-12 | Air conditioning apparatus |
DE60232301T DE60232301D1 (en) | 2002-03-12 | 2002-03-12 | air conditioning |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02251748A EP1344989B1 (en) | 2002-03-12 | 2002-03-12 | Air conditioning apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1344989A1 EP1344989A1 (en) | 2003-09-17 |
EP1344989B1 true EP1344989B1 (en) | 2009-05-13 |
Family
ID=27763426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02251748A Expired - Lifetime EP1344989B1 (en) | 2002-03-12 | 2002-03-12 | Air conditioning apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1344989B1 (en) |
AT (1) | ATE431528T1 (en) |
DE (1) | DE60232301D1 (en) |
ES (1) | ES2325149T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2295885A1 (en) * | 2009-08-27 | 2011-03-16 | STULZ GmbH | Small air-conditioning unit with heat exchanger and air conditioning method |
CN102466313A (en) * | 2010-11-18 | 2012-05-23 | 世图兹空调技术系统(上海)有限公司 | Air conditioning cabinet with folding heat exchange coil pipe |
CN112984652A (en) * | 2019-12-17 | 2021-06-18 | 阿里巴巴集团控股有限公司 | Fan coil unit equipment, adjusting method and device thereof, air conditioning equipment and adjusting method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1604240C3 (en) * | 1965-08-13 | 1978-05-18 | Nikolaus 7141 Aldingen Laing | Device for heating and / or cooling room air |
JPS594839A (en) * | 1982-06-30 | 1984-01-11 | Toshiba Corp | Air conditioner |
GB2296087A (en) * | 1994-12-12 | 1996-06-19 | Industcool Eng Ltd | Air conditioning arrangement |
-
2002
- 2002-03-12 EP EP02251748A patent/EP1344989B1/en not_active Expired - Lifetime
- 2002-03-12 AT AT02251748T patent/ATE431528T1/en not_active IP Right Cessation
- 2002-03-12 DE DE60232301T patent/DE60232301D1/en not_active Expired - Lifetime
- 2002-03-12 ES ES02251748T patent/ES2325149T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1344989A1 (en) | 2003-09-17 |
DE60232301D1 (en) | 2009-06-25 |
ATE431528T1 (en) | 2009-05-15 |
ES2325149T3 (en) | 2009-08-27 |
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