EP2486333A1 - Independent system for dehumidifying air - Google Patents

Independent system for dehumidifying air

Info

Publication number
EP2486333A1
EP2486333A1 EP10790591A EP10790591A EP2486333A1 EP 2486333 A1 EP2486333 A1 EP 2486333A1 EP 10790591 A EP10790591 A EP 10790591A EP 10790591 A EP10790591 A EP 10790591A EP 2486333 A1 EP2486333 A1 EP 2486333A1
Authority
EP
European Patent Office
Prior art keywords
air
consumers
stream
heat exchanger
treatment
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.)
Withdrawn
Application number
EP10790591A
Other languages
German (de)
French (fr)
Inventor
Francesco Bettella
Davide Zardo
Lex Coors
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.)
Uniflair SpA
Original Assignee
Uniflair SpA
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 Uniflair SpA filed Critical Uniflair SpA
Publication of EP2486333A1 publication Critical patent/EP2486333A1/en
Withdrawn legal-status Critical Current

Links

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
    • F24F3/06—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
    • 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

Definitions

  • the present invention relates to a system for the treatment of air of the type described in the preamble of the main claim.
  • a plurality of consumers constituted by respective units for the treatment of air such as, for example, precision units for conditioning data rooms, units for cooling one or more rooms or units for the treatment of the primary air or the fresh air for a plurality of rooms,
  • a hydraulic plant for distributing the refrigerated water to the consumers comprising pipes, pumps, storage containers and control valves,
  • the above-described system is used for controlling both the temperature and the humidity of the air, normally being arranged with a temperature of the refrigerated water so as to comply with both the sensible load and the latent load.
  • There further exist more advanced systems which operate with centralized control of the temperature of the refrigerated water.
  • the control device lowers the temperature of the refrigerated water only when an element of the system requires dehumidification, bringing the water of the plant below the dew-point.
  • That type of control involves a range of disadvantages owing to the fact that refrigerated water is also conveyed at a temperature below the dew-point to the consumers which do not require reductions in the humidity level. This brings about:
  • the overall efficiency of the system is therefore not optimum and the lost power is particularly significant when the number of consumers who require a reduction in the humidity level is small with respect to the total number of consumers.
  • the main object of the invention is to provide a system for the treatment of air that is structurally and functionally configured so as to overcome all the disadvantages set out with reference to the cited prior art.
  • an object of the invention is to construct a system for the treatment of air for cooling and dehumidifying the air in a plurality of consumers having a high level of efficiency which is only slightly variable when the operating conditions of the system itself vary.
  • FIG. 1 is a schematic diagram of a system for the treatment of air according to the present invention
  • FIG. 2 is a schematic view of a detail of the system of Figure 1;
  • Figure 3 is a schematic view of a construction variant of the detail of Figure 2.
  • the system 1 comprises a source 3 of refrigerated water which is connected to the consumers 2 by means of a hydraulic circuit 4.
  • the source 3 is a source of a refrigerated fluid other than water.
  • the source 3 may be of any type, for example, it may be constituted by a portion of the circuit 4 connected to a refrigeration plant.
  • Figure 1 illustrates a possible configuration of the system in which the consumers 2 are connected to the source 3 in parallel by means of two pipes 6 and 7 for the delivery and return of the refrigerated water, respectively.
  • the consumers 2 it is possible for the consumers 2 to be connected to the source 3 in series, or to be connected in a mixed manner, wherein the hydraulic circuit 4 comprises a plurality of rings of consumers, optionally separated by means of storage containers or distribution valves.
  • the hydraulic circuit 4 could have any configuration provided that the refrigerated water can reach all the consumers 2 at the operating temperature required.
  • Each of the consumers 2 is constituted by a unit for the treatment of air by controlling the temperature and the humidity level of the air in one or more rooms of a building.
  • each of the consumers 2 can be constituted by a precision unit for conditioning the air in data rooms, or a unit for the treatment of the primary air, or a unit for cooling the air for one or more rooms, for example, offices and/or meeting rooms, or rooms of another type.
  • each of the consumers 2 comprises two collectors 2a, b, an intake collector and a discharge collector, respectively, for the refrigerated water.
  • the collectors 2a, b are connected to the delivery and return pipes 6, 7 of the hydraulic circuit 4, respectively.
  • Each consumer further comprises a heat exchanger 9, through which a stream 10 of air passes in order to cool and dehumidify.
  • the heat exchanger 9 is supplied with refrigerated water by means of a supply conduit 11 which extends between the collector 2a and an intake 9a which is provided on the heat exchanger 9.
  • the heat exchanger 9 is placed in thermal contact with the source 3 of refrigerated water in order to cool the stream 10 of air which passes through it.
  • the stream 10 of air confers heat on the refrigerated water and becomes cooler.
  • the water being discharged from the heat exchanger 9 is conveyed to the hydraulic circuit 4 and thereby to the source 3 by means of a return conduit 12 which extends between an outlet 4b of the heat exchanger and the discharge collector 2b.
  • the supply and return conduits 11, 12 are mutually connected by means of a recirculation conduit 13.
  • a three-way valve 14 for adjusting the flow of refrigerated water through the heat exchanger 9.
  • the air treatment system 1 comprises in the consumer 2 a refrigerating circuit 15 which is conventional per se and which has an evaporator 16, a compressor 17 which is positioned upstream of the evaporator 16 for recirculating a refrigerating fluid inside the circuit 15, a control valve 18 which is positioned downstream of the evaporator 16 for adjusting the flow of the refrigerating fluid and a condenser 19 which is positioned between the compressor 17 and the valve 18 for diffusing the condensation heat.
  • a refrigerating circuit 15 which is conventional per se and which has an evaporator 16, a compressor 17 which is positioned upstream of the evaporator 16 for recirculating a refrigerating fluid inside the circuit 15, a control valve 18 which is positioned downstream of the evaporator 16 for adjusting the flow of the refrigerating fluid and a condenser 19 which is positioned between the compressor 17 and the valve 18 for diffusing the condensation heat.
  • the evaporator 16 is adjacent to the heat exchanger 9 and in thermal contact with the stream 10 of air in order to dehumidify it.
  • the evaporator 16 is placed upstream of the heat exchanger 9 with respect to the stream 10 of air.
  • the evaporator 16 is placed downstream of the heat exchanger 9 with respect to the stream 10 of air.
  • the two variants in Figures 2 and 3 are mutually equivalent from a functional point of view.
  • the condensate is separated from the stream 10 of air in a condensate collection device which is provided in the heat exchanger 9 and, in the case of Figure 3, the condensate is separated from the stream 10 of air in a condensate collection device which is provided in the evaporator 16.
  • the condenser 19 is in thermal contact with the source 3 of refrigerated water by way-of two discharge conduits 20, 21, through which refrigerated water flows and which are connected to the collectors 2a, b, respectively.
  • the condenser 19 is in thermal contact with a cold source which is separate from the source 3.
  • the refrigerating circuit 15 may be included in all the consumers 2 of the system 1 or only in some thereof, in particular in the consumers which require independent control of the humidity level in the stream of treated air.
  • the refrigerating circuit 15 it is possible to lower the temperature of the stream 10 of air at the heat exchanger 16 until the dew-point is reached (typically between 5°C and 10°C) so as to dehumidify the stream 10 of air without affecting the temperature of the refrigerated water in the circuit 4 which can therefore be kept at a higher level (typically between 12°C and 15°C in accordance with the sensible heat load).
  • the refrigerating circuits 15 in the consumers 2 are independent of each other so as to be able to control the dehumidification function in the various consumers 2 independently of each other.
  • the invention thereby achieves the object set out, at the same time bringing about a large number of advantages, the main advantage of which is allowing a significant reduction in the energy consumption of the system 1.
  • the structural simplicity of the refrigerating circuit 15 and the ease of its connection to the heat exchanger 9 allows the present invention also to be applied to systems for the treatment of air already in existence, which are similar to the system 1 but do not have an independent device for controlling the humidity level for one or more of the consumers 2.
  • it is possible to implement a method for improving such systems which involves a stage of installing the refrigerating circuit 15 so as to have the evaporator 16 in thermal contact with the stream 10 of air in order to dehumidify it as described above.

Abstract

A system (1) for the treatment of air for a plurality of consumers (2), comprising: - a source (3) of refrigerated fluid, - a plurality of consumers (2) in each of which is provided a respective heat exchanger (9) through which a stream (10) of air passes, the heat exchanger (9) being in thermal contact with the source (3) of refrigerated water in order to cool the respective stream (10) of air, - a refrigerating circuit (15) in at least one of the consumers (2) having an evaporator (16) in thermal contact with the stream (10) of air in order to dehumidify the latter.

Description

INDEPENDENT SYSTEM FOR DEHUMIDIFYING AIR
DESCRIPTION
Technical field
The present invention relates to a system for the treatment of air of the type described in the preamble of the main claim.
Technological background
In the technical field of conditioning environments, particularly though not exclusively for the treatment of air in environments which accommodate electronic processors, it is known to use systems involving refrigerated fluid, typically constituted by refrigerated water, comprising :
- a source of refrigerated water, for example, produced by means of an external refrigerator,
- a plurality of consumers constituted by respective units for the treatment of air such as, for example, precision units for conditioning data rooms, units for cooling one or more rooms or units for the treatment of the primary air or the fresh air for a plurality of rooms,
- a hydraulic plant for distributing the refrigerated water to the consumers, comprising pipes, pumps, storage containers and control valves,
- a device for adjusting and controlling the system.
In such a technical field, the above-described system is used for controlling both the temperature and the humidity of the air, normally being arranged with a temperature of the refrigerated water so as to comply with both the sensible load and the latent load. There further exist more advanced systems which operate with centralized control of the temperature of the refrigerated water. The control device lowers the temperature of the refrigerated water only when an element of the system requires dehumidification, bringing the water of the plant below the dew-point.
That type of control involves a range of disadvantages owing to the fact that refrigerated water is also conveyed at a temperature below the dew-point to the consumers which do not require reductions in the humidity level. This brings about:
- an increase in the consumption of refrigerated water,
- a reduction in the humidity level at the consumers which do not need it too (at times, that reduction is compensated for by humidifiers with additional consumption of energy),
- high transient times between states of the system, in which one or more consumers require(s) the dehumidification of air and states in which no consumer requires dehumidification of air.
The overall efficiency of the system is therefore not optimum and the lost power is particularly significant when the number of consumers who require a reduction in the humidity level is small with respect to the total number of consumers.
Statement of invention
The main object of the invention is to provide a system for the treatment of air that is structurally and functionally configured so as to overcome all the disadvantages set out with reference to the cited prior art.
In particular, an object of the invention is to construct a system for the treatment of air for cooling and dehumidifying the air in a plurality of consumers having a high level of efficiency which is only slightly variable when the operating conditions of the system itself vary. These objects and other objects which will be appreciated below are considered and achieved by the invention by means of a vehicle constructed in accordance with the appended claims.
Brief description of the drawings
The features and advantages of the invention will be better appreciated from the following detailed description of one preferred embodiment thereof which is given purely by way of non-limiting example with reference to the appended drawings, in which :
- Figure 1 is a schematic diagram of a system for the treatment of air according to the present invention;
- Figure 2 is a schematic view of a detail of the system of Figure 1;
- Figure 3 is a schematic view of a construction variant of the detail of Figure 2.
Preferred embodiment of the invention
With reference to the appended Figures, there is generally designated 1 a system 1 for the treatment of air for a plurality of consumers 2. The system 1 comprises a source 3 of refrigerated water which is connected to the consumers 2 by means of a hydraulic circuit 4. According to a construction variant of the invention, the source 3 is a source of a refrigerated fluid other than water. For the purposes of the present invention, the source 3 may be of any type, for example, it may be constituted by a portion of the circuit 4 connected to a refrigeration plant.
The example of Figure 1 illustrates a possible configuration of the system in which the consumers 2 are connected to the source 3 in parallel by means of two pipes 6 and 7 for the delivery and return of the refrigerated water, respectively.
In other construction variants of the system 1 (not illustrated), it is possible for the consumers 2 to be connected to the source 3 in series, or to be connected in a mixed manner, wherein the hydraulic circuit 4 comprises a plurality of rings of consumers, optionally separated by means of storage containers or distribution valves.
In general, for the purposes of the present invention, the hydraulic circuit 4 could have any configuration provided that the refrigerated water can reach all the consumers 2 at the operating temperature required.
Each of the consumers 2 is constituted by a unit for the treatment of air by controlling the temperature and the humidity level of the air in one or more rooms of a building. By way of example, each of the consumers 2 can be constituted by a precision unit for conditioning the air in data rooms, or a unit for the treatment of the primary air, or a unit for cooling the air for one or more rooms, for example, offices and/or meeting rooms, or rooms of another type.
With reference to Figure 2, each of the consumers 2 comprises two collectors 2a, b, an intake collector and a discharge collector, respectively, for the refrigerated water. The collectors 2a, b are connected to the delivery and return pipes 6, 7 of the hydraulic circuit 4, respectively. Each consumer further comprises a heat exchanger 9, through which a stream 10 of air passes in order to cool and dehumidify. The heat exchanger 9 is supplied with refrigerated water by means of a supply conduit 11 which extends between the collector 2a and an intake 9a which is provided on the heat exchanger 9. By means of the conduit 11, the heat exchanger 9 is placed in thermal contact with the source 3 of refrigerated water in order to cool the stream 10 of air which passes through it.
In the heat exchanger 9, the stream 10 of air confers heat on the refrigerated water and becomes cooler. The water being discharged from the heat exchanger 9 is conveyed to the hydraulic circuit 4 and thereby to the source 3 by means of a return conduit 12 which extends between an outlet 4b of the heat exchanger and the discharge collector 2b. The supply and return conduits 11, 12 are mutually connected by means of a recirculation conduit 13. At the point of intersection between the return pipe 12 and recirculation pipe 13, there is provided a three-way valve 14 for adjusting the flow of refrigerated water through the heat exchanger 9. By the opening of the valve 14 being adjusted, it is possible to subdivide the flow of water arriving at the collector 2a between the supply conduit 11 and the recirculation conduit 13. In that manner, the flow through the heat exchanger 9 can be adjusted in accordance with the specific requirements of each consumer 2, independently of the flow of refrigerated water in the hydraulic circuit 4. The air treatment system 1 comprises in the consumer 2 a refrigerating circuit 15 which is conventional per se and which has an evaporator 16, a compressor 17 which is positioned upstream of the evaporator 16 for recirculating a refrigerating fluid inside the circuit 15, a control valve 18 which is positioned downstream of the evaporator 16 for adjusting the flow of the refrigerating fluid and a condenser 19 which is positioned between the compressor 17 and the valve 18 for diffusing the condensation heat.
The evaporator 16 is adjacent to the heat exchanger 9 and in thermal contact with the stream 10 of air in order to dehumidify it.
In the construction variant of Figure 2, the evaporator 16 is placed upstream of the heat exchanger 9 with respect to the stream 10 of air.
In the construction variant of Figure 3, the evaporator 16 is placed downstream of the heat exchanger 9 with respect to the stream 10 of air. The two variants in Figures 2 and 3 are mutually equivalent from a functional point of view. In the case of Figure 2, the condensate is separated from the stream 10 of air in a condensate collection device which is provided in the heat exchanger 9 and, in the case of Figure 3, the condensate is separated from the stream 10 of air in a condensate collection device which is provided in the evaporator 16.
In both variants of Figures 2 and 3, the condenser 19 is in thermal contact with the source 3 of refrigerated water by way-of two discharge conduits 20, 21, through which refrigerated water flows and which are connected to the collectors 2a, b, respectively. In other construction variants which are not illustrated, the condenser 19 is in thermal contact with a cold source which is separate from the source 3.
The refrigerating circuit 15 may be included in all the consumers 2 of the system 1 or only in some thereof, in particular in the consumers which require independent control of the humidity level in the stream of treated air.
Using the refrigerating circuit 15, it is possible to lower the temperature of the stream 10 of air at the heat exchanger 16 until the dew-point is reached (typically between 5°C and 10°C) so as to dehumidify the stream 10 of air without affecting the temperature of the refrigerated water in the circuit 4 which can therefore be kept at a higher level (typically between 12°C and 15°C in accordance with the sensible heat load). The refrigerating circuits 15 in the consumers 2 are independent of each other so as to be able to control the dehumidification function in the various consumers 2 independently of each other.
The invention thereby achieves the object set out, at the same time bringing about a large number of advantages, the main advantage of which is allowing a significant reduction in the energy consumption of the system 1.
Furthermore, the structural simplicity of the refrigerating circuit 15 and the ease of its connection to the heat exchanger 9 allows the present invention also to be applied to systems for the treatment of air already in existence, which are similar to the system 1 but do not have an independent device for controlling the humidity level for one or more of the consumers 2. In those cases, it is possible to implement a method for improving such systems, which involves a stage of installing the refrigerating circuit 15 so as to have the evaporator 16 in thermal contact with the stream 10 of air in order to dehumidify it as described above.

Claims

A system (1) for the treatment of air for a plurality of consumers (2), comprising :
a source (3) of refrigerated fluid
- a plurality of consumers (2) in each of which is provided a respective heat exchanger (9) through which a stream (10) of air passes, the heat exchanger being in thermal contact with the source (3) of refrigerated fluid in order to cool the respective stream (10) of air,
characterized in that it comprises a refrigerating circuit (15) in at least one of the consumers (2), the refrigerating circuit (15) having an evaporator (16) in thermal contact with the stream (10) of air in order to dehumidify the latter.
A system (1) for the treatment of air according to claim 1, wherein the at least one refrigerating circuit (15) comprises a condenser (19) in thermal contact with the source (3) of refrigerated fluid.
A system (1) for the treatment of air according to claim 1 or 2, wherein the evaporator (16) is placed upstream of the heat exchanger (9) with respect to the stream of air.
A system (1) for the treatment of air according to claim 1 or 2, wherein the evaporator (16) is placed downstream of the heat exchanger (9) with respect to the stream of air.
A system (1) for the treatment of air according to any one of the preceding claims, wherein the evaporator (16) is adjacent to the heat exchanger (9).
6. A method for improving a system (1) for the treatment of air for a plurality of consumers (2), the system (1) comprising:
a source (3) of refrigerated fluid,
a plurality of consumers (2) in each of which is provided a respective heat exchanger (9) through which a stream (10) of air passes, the heat exchanger (9) being in thermal contact with the source (3) of refrigerated water in order to cool the respective stream (10) of air,
characterized in that it includes the stage of installing a refrigerating circuit (15) in at least one of the consumers (2), the refrigerating circuit (15) being arranged in such a manner as to have an evaporator (16) in thermal contact with the stream (10) of air in order to dehumidify the latter.
EP10790591A 2009-10-09 2010-10-08 Independent system for dehumidifying air Withdrawn EP2486333A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2009A000294A IT1395867B1 (en) 2009-10-09 2009-10-09 INDEPENDENT AIR DEHUMIDIFICATION SYSTEM
PCT/IB2010/054554 WO2011042887A1 (en) 2009-10-09 2010-10-08 Independent system for dehumidifying air

Publications (1)

Publication Number Publication Date
EP2486333A1 true EP2486333A1 (en) 2012-08-15

Family

ID=42165263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10790591A Withdrawn EP2486333A1 (en) 2009-10-09 2010-10-08 Independent system for dehumidifying air

Country Status (4)

Country Link
EP (1) EP2486333A1 (en)
IT (1) IT1395867B1 (en)
RU (1) RU2012118389A (en)
WO (1) WO2011042887A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6089697B2 (en) * 2012-12-27 2017-03-08 ダイキン工業株式会社 Humidity control device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753262B1 (en) * 1996-09-10 1998-11-27 France En Et Cie AIR CONDITIONING DEVICE
FR2776053B1 (en) * 1998-03-10 2000-06-16 Francois Lego METHOD FOR INSTALLING A HEATING AND AIR CONDITIONING SYSTEM USING A CENTRAL HEATING NETWORK, DEVICE, AND HEATING AND AIR CONDITIONING SYSTEM
DE19904667A1 (en) * 1999-02-04 2000-08-10 Stulz Gmbh Air conditioning unit for temperature regulation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011042887A1 *

Also Published As

Publication number Publication date
WO2011042887A1 (en) 2011-04-14
ITPD20090294A1 (en) 2011-04-10
IT1395867B1 (en) 2012-10-26
RU2012118389A (en) 2013-11-20

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