EP2957853A1 - Échangeur de chaleur pour système de conditionnement d'air - Google Patents

Échangeur de chaleur pour système de conditionnement d'air Download PDF

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Publication number
EP2957853A1
EP2957853A1 EP15164440.8A EP15164440A EP2957853A1 EP 2957853 A1 EP2957853 A1 EP 2957853A1 EP 15164440 A EP15164440 A EP 15164440A EP 2957853 A1 EP2957853 A1 EP 2957853A1
Authority
EP
European Patent Office
Prior art keywords
water
passageway
heat exchanger
refrigerant
condensing
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Withdrawn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
EP15164440.8A
Other languages
German (de)
English (en)
Inventor
Kar Hing Yau
Mei Yet New
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.)
Oyl Research & Development Centre Sdn Bhd
Original Assignee
Oyl Research & Development Centre Sdn Bhd
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 Oyl Research & Development Centre Sdn Bhd filed Critical Oyl Research & Development Centre Sdn Bhd
Publication of EP2957853A1 publication Critical patent/EP2957853A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0081—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by a single plate-like element ; the conduits for one heat-exchange medium being integrated in one single plate-like element
    • 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
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/007—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2260/00—Heat exchangers or heat exchange elements having special size, e.g. microstructures
    • F28F2260/02—Heat exchangers or heat exchange elements having special size, e.g. microstructures having microchannels

Definitions

  • the present invention relates generally to an air conditioning system. More particularly, it relates to a heat exchanger made of polymer and a system thereof.
  • a fin-tube heat exchanger used in air conditioning system comprises tubes and fins typically made of metallic materials such as copper and aluminium. These materials are known to provide high heat transfer efficiency which allows the air conditioning system to operate at a lower temperature.
  • the fabrication of the fin-tube heat exchanger is typically by means of mechanical expansion of copper tubes which provides mechanical grip against the aluminum fins. This creates an interference fits between the copper tubes and aluminium fins. At least two problems arise from the fabrication process. Firstly, the fitting gives an interfacial gap between the surfaces of copper tube and aluminium fins resulting in a thermal resistance of the heat exchanger to increase and lowering a thermal performance of the heat exchanger. Secondly, these metallic materials are becoming more expensive and a heat exchanger unit constructed from these materials will become costly.
  • an alternative material is required in order to substitute those metallic materials.
  • This alternative material must be cost effective and able to meet the operating requirement of an air conditioning system optimally. It is an object of the present invention to provide an improved heat exchanger of air conditioning system in which the heat exchanger is made of polymer such as plastic which is cost effective compared to copper and aluminium and is configured to perform heat transfer process in an air conditioning system optimally.
  • the polymer heat exchanger provides a condensing system of the air-conditioning system.
  • the heat exchanger is made of polymer such as plastic which can be molded into a variety of shapes.
  • the heat exchanger employs evaporative cooling method to reject heat absorbed from the hot refrigerant in the system.
  • the heat exchanger comprises a first portion and a second portion.
  • the first portion has a first passageway for allowing refrigerant to flow through and a second passageway for allowing water to flow through for condensing the refrigerant.
  • the first passageway is arranged next to the second passageway. The arrangement allows the heat from the refrigerant to be absorbed by the water flowing through the second passageway.
  • the second passageway is preferably configured to be bigger than the first passageway so that more water can flow through and more heat can be absorbed by the water.
  • the second portion of the heat exchanger is in fluid communication with the first portion for receiving the heated water from the first portion and cooling the same wherein the cooled water is circulated back to the first portion for condensing the refrigerant again.
  • the water from the first portion which enters second portion will be distributed onto a series of fillers/plates and flow downwardly passing the same while at the same time air is blown over the passing water/fillers to cool the water.
  • the fillers are made from vacuum form or injection molded plastic fills or splash.
  • a fan or a blower is provided to blow air over the second portion for cooling the water on the fillers.
  • the heat exchanger employs evaporative cooling to reject heat from the heated water coming from the first portion.
  • the first portion acts as a water-cooled condenser whereas the second portion acts as a cooling tower in which both first and second portions of the heat exchanger are made of polymer such as plastic.
  • the first passageway and the second passageway are arranged next to each other and in contact with one another.
  • the first passageway is alternately arranged next to the second passageway to form a series of layers.
  • the first passageway and the second passageway share a common wall which allows heat transfer between the refrigerant and the water to take place.
  • the first passageway preferably includes a plurality of thin walls arranged sideway relative to common wall which defines a plurality of tiny or micro channels.
  • the second passageway preferably includes a plurality of ribs arranged sideway which defines a plurality of channels.
  • the channel of the first passageway is smaller compared to the channels of the second passageway.
  • the channels are provided to allow the water and refrigerant to be distributed and flow uniformly along the passageways.
  • the plastic is molded to produce the above configurations.
  • the present invention relates generally to a heat exchanger of an air-conditioning system and more particularly relates to a heat exchanger made of polymer and a system thereof.
  • the heat exchanger is made of polymer such as plastic including but not limited to thermoplastic, thermosetting, polypropylene, polycarbonate and polyethylene as such no metallic materials are used in making the heat exchanger unit.
  • the heat exchanger comprises a first portion and a second portion.
  • the first portion of the heat exchanger includes a first passageway for allowing vapor refrigerant to flow through and is arranged next to a second passageway that allows water to flow through its body for condensing the refrigerant in the first passageway.
  • the second portion is in fluid communication with the first portion for receiving heated water from the first portion and cooling the same wherein the cooled water is circulated back to the first portion for condensing the refrigerant in the first portion again. This water circulation ensures the heat transfer process for condensing the refrigerant is performed efficiently.
  • the first portion of the heat exchanger acts as a water-cooled condenser and the second portion acts as a cooling tower.
  • the first portion (101) is in the form of a cube having layers of the first passageways (103) and second passageways (104) which are arranged next to each other.
  • the layers include channels to allow refrigerant and water to flow through the respective channels.
  • the structure/body of the first portion is made of polymer such as plastic.
  • the second portion (102) is in the form of the cube.
  • This cube is preferably disposed next to the cube of the first portion so that it can be packaged as a compact unit.
  • the water from the first portion enters the second portion via a water distributor (202) where the water will be distributed over the fillers or splashes (106).
  • the fillers provide a large surface area for the water to form water film.
  • the fillers can be made of plastic with corrugated design.
  • Figs. 6a and 6b show examples of fillers.
  • Fig. 6b shows fillers in the form of corrugated plate and
  • Fig. 6c shows fillers in the form triangular bars.
  • Air (501) is blown over the fillers to cool the water film.
  • a fan can be provided to blow the air.
  • the water will drop into a water collector (204) and be circulated back to the first portion.
  • the structure/body of the second portion is made of polymer such as plastic.
  • Fig. 3 shows the first passageway (103) with tiny or micro channels (105).
  • Fig. 4 shows the second passageway (104) with channels (107) bigger that the micro channels.
  • the respective channels are defined by a plurality of ribs (402) and thin walls (302) that extend sideway from the first sidewall/bottom wall to a second sidewall/top wall. The sidewalls may become the common walls of the first passageway and the second passageway.
  • the first passageway is alternately arranged next to the second passageway to form layers of channels.
  • the ribs on the second passageway are provided to strengthen the structure of the first portion, and more particularly to strengthen the first passageway as the first passage way is subject to high pressure and temperature of the refrigerant.
  • the number of layers the first portion can have will depend on the heat transfer requirement of the system.
  • the layers must provide sufficient surface areas to allow heat transfer to take place efficiently.
  • the second passageway will be disposed individually as the first layer and the end layer which will envelope or sandwich all the layers in between as shown in Fig.1 .
  • the first passageway has smaller channels compared to the channels of the second passageway.
  • the second passageway has larger channels which allow more water to flow. Large amount of water is required to absorb and dissipate the rejected heat from the first passageway and thus larger channel is designed to hold large amount of water to ensure heat transfer to be performed efficiently and the ribs provided on the channel to strengthen the structure.
  • the high pressure at the micro-channels of the first portion is strengthened by the ribs designed in the second portion.
  • the direction of fluid flow can be either cross flow or co-flow.
  • a cross flow is desired for higher heat transfer performance.
  • Fig. 5 shows the schematic diagram of the refrigerant cycle of the condensing system of the air-conditioner comprising the heat exchanger or condenser (10) of the present invention.
  • the first portion (101) is in fluid communication with the second portion (102) wherein water is circulated between the portions via a tubing system.
  • the first portion and the second portion work together as a condenser (10) of the air-conditioner as defined by the dotted line.
  • the first portion is in fluid communication with the evaporator (503) wherein refrigerant is circulated between first portion and the evaporator via a tubing system.
  • the tubing system comprises first tubing which connects the first portion to the evaporator via a compressor (505) and second tubing which connects the first portion to the evaporator via an expansion valve (507).
  • the condensing process of air conditioner will be further described with reference to Fig. 6a .
  • the heat available in a confined space will be absorbed by a refrigerant via the evaporator coils and change the refrigerant from liquid to hot vapour.
  • the hot vapour is then compressed by a compressor (607) which increases the temperature of the refrigerant.
  • the hot vapour refrigerant will enter the heat exchanger or condenser of the present invention via the first portion.
  • the hot vapour will enter the tiny or microchannels (105) and at the same time water flows through the other channels (107) which are arranged next to the microchannels where the heat from the hot vapour refrigerant is absorbed by the water and change the refrigerant from vapour to liquid.
  • the cooled refrigerant is then channelled back to the evaporator via an expansion valve which completes the refrigerant loop (801).
  • the heated water from the first portion is channelled to the second portion where the hot water is distributed at the top by a water distributor (202) and passed onto the fillers or splashes.
  • the hot water is then cooled by passing cold air (501) through the fillers or splashes (106).
  • the cooled water is collected in a container or water collector (204) at the bottom of the second portion and it is pumped by a pump (608) to the first portion which completes the water loop (802).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP15164440.8A 2014-06-20 2015-04-21 Échangeur de chaleur pour système de conditionnement d'air Withdrawn EP2957853A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
MYPI2014701697 2014-06-20

Publications (1)

Publication Number Publication Date
EP2957853A1 true EP2957853A1 (fr) 2015-12-23

Family

ID=52997327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15164440.8A Withdrawn EP2957853A1 (fr) 2014-06-20 2015-04-21 Échangeur de chaleur pour système de conditionnement d'air

Country Status (2)

Country Link
EP (1) EP2957853A1 (fr)
JP (1) JP2016014518A (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003314859A (ja) * 2002-04-22 2003-11-06 Mitsubishi Heavy Ind Ltd 空調装置
US20130047641A1 (en) * 2011-08-23 2013-02-28 Phoenix Manufacturing Inc. Evaporative condenser cooling unit and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003314859A (ja) * 2002-04-22 2003-11-06 Mitsubishi Heavy Ind Ltd 空調装置
US20130047641A1 (en) * 2011-08-23 2013-02-28 Phoenix Manufacturing Inc. Evaporative condenser cooling unit and method

Also Published As

Publication number Publication date
JP2016014518A (ja) 2016-01-28

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