US20190323761A1 - Dehumidifying Device with Temperature Control - Google Patents

Dehumidifying Device with Temperature Control Download PDF

Info

Publication number
US20190323761A1
US20190323761A1 US15/960,618 US201815960618A US2019323761A1 US 20190323761 A1 US20190323761 A1 US 20190323761A1 US 201815960618 A US201815960618 A US 201815960618A US 2019323761 A1 US2019323761 A1 US 2019323761A1
Authority
US
United States
Prior art keywords
cooling coil
dehumidifying device
dehumidifying
condenser
space
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.)
Abandoned
Application number
US15/960,618
Inventor
Wei-Yi Chiang
Original Assignee
Wei-Yi Chiang
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 Wei-Yi Chiang filed Critical Wei-Yi Chiang
Priority to US15/960,618 priority Critical patent/US20190323761A1/en
Publication of US20190323761A1 publication Critical patent/US20190323761A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002Defroster control
    • F25D21/006Defroster control with electronic control circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00Air-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
    • F24F3/12Air-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
    • F24F3/14Air-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00Compression machines, plants or systems, with several condenser circuits
    • F25B6/04Compression machines, plants or systems, with several condenser circuits arranged in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06Removing frost
    • F25D21/08Removing frost by electric heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00Air-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
    • F24F3/12Air-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
    • F24F3/14Air-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
    • F24F2003/144Air-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 by dehumidification only
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00Details of evaporators; Details of condensers
    • F25B2339/04Details of condensers
    • F25B2339/047Water-cooled condensers

Abstract

A dehumidifying device includes a compressor, a heating coil, an expansion valve and a cooling coil which are connected to construct a complete refrigeration cycle. Te dehumidifying device further comprises a condenser connected between the compressor and the heating coil. In such a manner, the condenser has a heat output that is controlled to regulate a temperature in a space, with the dehumidifying device simultaneously controlling the humidity and the temperature in the space.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • The present invention relates to an air conditioning technology and, more particularly, to a dehumidifying device.
  • 2. Description of the Related Art
  • A conventional direct expansion dehumidifying device in accordance with the prior art shown in FIG. 3 comprises a compressor “COM”, a heating coil “HC”, an expansion valve “EXP” and a cooling coil “CC” which are connected to construct a complete refrigeration cycle. In practice, the conventional direct expansion dehumidifying device further comprises an air conditioner unit 1 and an exterior air conditioning space 2 connected with the air conditioner unit 1. The air conditioner unit 1 is divided into an equipment space 10 and an interior air conditioning space 11 for mounting all of the above-mentioned parts of the present invention. Preferably, the equipment space 10 and the interior air conditioning space 11 are integrated into a single space. The interior air conditioning space 11 is provided with a supply fan “SF” which is connected with a supply air outlet “SA” of the exterior air conditioning space 2. The exterior air conditioning space 2 is provided with a return air outlet “RA” which is connected with the interior air conditioning space 11. The exterior air conditioning space 2 is also provided with a humidity sensor “HS”. However, the conventional direct expansion dehumidifying device only has a humidity control function and does not have a temperature control function, so that it is necessary to provide an additional air-conditioning system to control the temperature, thereby increasing the cost.
  • BRIEF SUMMARY OF THE INVENTION
  • The primary objective of the present invention is to provide a dehumidifying device with temperature control, so that the dehumidifying device simultaneously controls humidity and temperature in a space.
  • In accordance with the present invention, there is provided a dehumidifying device comprising a compressor, a heating coil, an expansion valve and a cooling coil which are connected to construct a complete refrigeration cycle. The dehumidifying device further comprises a condenser connected between the compressor and the heating coil. In such a manner, the condenser has a heat output that is controlled to regulate a temperature in a space, with the dehumidifying device simultaneously controlling the humidity and the temperature in the space.
  • Preferably, the cooling coil includes a first cooling coil and a second cooling coil which are operated alternatingly. The first cooling coil includes a first defrosting unit and a first electric throttle. The second cooling coil includes a second defrosting unit and a second electric throttle. In practice, after the first cooling coil performs dehumidifying and frosting to have a predetermined thickness, the second electric throttle is switched to the second cooling coil, with the second cooling coil performing dehumidifying and frosting, and with the first cooling coil performing defrosting. Thus, the first cooling coil and the second cooling coil are operated successively and periodically to achieve a dehumidifying function under a condition of lower than the dew point of 0° C.
  • Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
  • BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)
  • FIG. 1 is a graph showing a pressure versus enthalpy relationship of a conventional refrigeration cycle in accordance with the prior art.
  • FIG. 2 is a graph showing a pressure versus enthalpy relationship of a refrigeration cycle in accordance with the present invention.
  • FIG. 3 is a schematic circuit layout of a conventional direct expansion dehumidifying device in accordance with the prior art.
  • FIG. 4 is a schematic circuit layout of a dehumidifying device in accordance with the preferred embodiment of the present invention.
  • FIG. 5 is a schematic circuit layout of a dehumidifying device in accordance with another preferred embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention relates to a heat exchanger including a refrigerant of a compressor “COM” refrigeration cycle. In the basic refrigeration cycle, the heat exchanger only relates to an evaporator “EVP” and a condenser “CON”. In the present invention, the evaporator and the condenser have different names at different positions, but the primary function (heat exchange function) of the evaporator and the condenser is not changed. For example, the cooling coil “CC” is also an evaporator “EVP”, and the heating coil “HC” is also a condenser “CON”.
  • Referring to the drawings and initially to FIG. 4, a dehumidifying device in accordance with the preferred embodiment of the present invention comprises a compressor “COM”, a heating coil “HC”, an expansion valve “EXP” and a cooling coil “CC” which are connected to construct a complete refrigeration cycle. The characteristic of the present invention is in that, the dehumidifying device further comprises a condenser “CON” connected between the compressor “COM” and the heating coil “HC”. In such a manner, the condenser “CON” has a heat output that is controlled to regulate a temperature in a space, so that the dehumidifying device simultaneously controls the humidity and the temperature in the space. In the preferred embodiment of the present invention, the condenser “CON” is a water-cooled condenser. Alternatively, the condenser “CON” is an air-cooled condenser.
  • In practice, the dehumidifying device further comprises an air conditioner unit 1 and an exterior air conditioning space 2 connected with the air conditioner unit 1. The air conditioner unit 1 is divided into an equipment space 10 and an interior air conditioning space 11 for mounting all of the above-mentioned parts of the present invention, including the compressor “COM”, the heating coil “HC”, the expansion valve “EXP”, the cooling coil “CC” and the condenser “CON”. Preferably, the equipment space 10 and the interior air conditioning space 11 are integrated into a single space. The interior air conditioning space 11 is provided with a supply fan “SF” which is connected with a supply air outlet “SA” of the exterior air conditioning space 2. The exterior air conditioning space 2 is provided with a return air outlet “RA” which is connected with the interior air conditioning space 11. The exterior air conditioning space 2 is also provided with a humidity sensor “HS” to detect the humidity and a temperature sensor “TS” to detect the temperature. The condenser “CON” is connected with a proportional control valve “MV-T”, a cooling water inlet valve “CWS” and a cooling water return valve “CWR”. Preferably, the proportional control valve “MV-T” is a two-way valve or a three-way valve. In such a manner, the heat output of the condenser “CON” is controlled to regulate the temperature of the exterior air conditioning space 2, so that the dehumidifying device simultaneously controls the humidity and the temperature in the exterior air conditioning space 2.
  • In the traditional dehumidifying device, operation of the compressor is controlled by a humidity preset value. In the dehumidifying device of the present invention, operation of the compressor “COM” is controlled simultaneously by a preset humidity value and a preset temperature value that are controlled by a controller. Thus, when the humidity of the exterior air conditioning space 2 does not reach the preset humidity value or the temperature of the exterior air conditioning space 2 does not reach the preset temperature value, the compressor “COM” is operated successively.
  • In the present invention, the condenser “CON” is added and connected between the compressor “COM” and the heating coil “HC”, so as to control the temperature of the exterior air conditioning space 2 by controlling the heat output of the condenser “CON”. The dehumidifying device of the present invention produces subcooling in the refrigerant system, and the traditional dehumidifying system does not have such a subcooling action. In such a manner, the subcooling of the refrigerant will enhance the dehumidifying (or refrigerating) capability of the refrigerant system.
  • The first difference between the dehumidifying device of the present invention and the traditional dehumidifying device is in that, the temperature control function is enhanced in a determined space that needs a temperature control, so that it is unnecessary to provide additional air-conditioning equipment, thereby decreasing the cost.
  • Referring now to FIG. 1, a refrigeration cycle of the traditional dehumidifying device comprises a compression process a−b (by a compressor), a condensing process b−c (by a condenser), a throttling process c−d (by an expansion valve), and an evaporation process d−a (by an evaporator).
  • In the compression process a−b,

  • W c =G×(h b −h a)
  • In the condensing process b−c,

  • Q c =G×(h b −h c)
  • In the throttling process c−d,

  • h d =h c
  • In the evaporation process “d−a”,

  • Q e =G×(h a −h d)
  • The operational balance of the compressor is listed as follow:

  • Q c =Q e +W c
  • When Qc and Qe are not balanced (Qc>Qe), the temperature balance in the space is not achieved. Thus, when the traditional dehumidifying device is started, the temperature in the space rises, so that it is necessary to provide an additional air-conditioning system to carry away the residual heat.
  • The symbols of the above-mentioned equations are described as follow:
  • Wc=power of the compressor=KJ/S(KW)
  • G=mass flow rate of the refrigerant=KG/S
  • h=enthalpy of the refrigerant=KJ/KG
  • Qc=heat output per unit time of the condenser=KJ/S(KW)
  • Qe=heat input per unit time of the evaporator=KJ/S(KW)
  • Referring now to FIG. 2, a refrigeration cycle of the dehumidifying device of the present invention comprises a compression process a−b (by a compressor), a condensing process b−c (by a condenser), a throttling process c′−d′ (by an expansion valve), and an evaporation process d′−d+d−a (by a gain of the refrigerant subcooling plus a traditional evaporator).
  • In the compression process a−b,

  • W c =G×(h b −h a)
  • In the condensing process b−c,

  • Q c =Q c1 +Q c2
  • In the throttling process c′−d′,

  • h d′ =h c′,
  • In the evaporation process d′−d+d−a,

  • Q e =Q e1 +Q e2

  • Q e =G×(h a −h d)+G×(h d −h d′)
  • The operational balance of the compressor is listed as follow:

  • Q c =Q e +W c

  • (Q c1 +Q c2)=(Q e1 +Q e2)+W c
  • The symbols of the above-mentioned equations are described as follow:
  • Wc=power of the compressor=KJ/S(KW)
  • G=mass flow rate of the refrigerant=KG/S
  • h=enthalpy of the refrigerant=KJ/KG
  • Qc=total heat output per unit time of the condenser=KJ/S(KW)
  • Qc1=first heat output per unit time of the condenser=KJ/S(KW)
  • Qc2=second heat output per unit time of the condenser=KJ/S(KW)
  • Qe=total heat input per unit time of the evaporator=KJ/S(KW)
  • Qe1=first heat input per unit time of the evaporator=KJ/S(KW)
  • Qe2=second heat input per unit time of the evaporator=KJ/S(KW)
  • The second difference between the dehumidifying device of the present invention and the traditional dehumidifying device is in that, the dehumidifying capability of the dehumidifying device of the present invention is enhanced under the same power Wc of the compressor.
  • In the evaporation process d−a of the traditional dehumidifying device as shown in FIG. 1,

  • Q e =G×(h a −h d)
  • In the evaporation process d′−d+d−a of the dehumidifying device of the present invention as shown in FIG. 2,

  • Q e =Q e1 +Q e2

  • Q e =G×(h a −h d)+G×(h d −h d′)
  • In comparison, the dehumidifying capability (Qe=Qe1+Qe2) of the dehumidifying device of the present invention is greater than the dehumidifying capability (Qe=Qe1) of the traditional dehumidifying device under the same power Wc of the compressor. Thus, the subcooling of the refrigerant in the refrigeration cycle enhances the refrigerating (or dehumidifying) effect as indicated by shadow lines in FIG. 2.
  • The above-mentioned dehumidifying device is available for a condition higher than a dew point of 0° C. When the dehumidifying device is used under a condition lower than the dew point of 0° C., it is necessary to consider the frosting problem.
  • Referring to FIG. 5 with reference to FIG. 4, a dehumidifying device in accordance with another preferred embodiment of the present invention is available for a condition lower than the dew point of 0° C. The cooling coil “CC” includes a first cooling coil “CC1” and a second cooling coil “CC2” which are operated alternatingly. The first cooling coil “CC1” includes a first defrosting unit “WMD1” and a first electric throttle “MD1”. The second cooling coil “CC2” includes a second defrosting unit “WMD2” and a second electric throttle “MD2”. In practice, after the first cooling coil “CC1” performs dehumidifying and frosting to have a predetermined thickness, the second electric throttle “MD2” is switched to the second cooling coil “CC2”, so that the second cooling coil “CC2” performs dehumidifying and frosting, and the first cooling coil “CC1” performs defrosting, and vice versa. Thus, the above-mentioned procedures are operated successively and periodically to achieve a dehumidifying function under the condition of lower than the dew point of 0° C.
  • It is appreciated that, when the dehumidifying device is available for the condition lower than the dew point of 0° C., the dehumidifying device replaces the traditional silica gel desiccant wheel system.
  • Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the scope of the invention.

Claims (2)

1. A dehumidifying device comprising:
a compressor, a heating coil, an expansion valve and a cooling coil which are connected to construct a complete refrigeration cycle;
wherein:
the dehumidifying device further comprises a condenser connected between the compressor and the heating coil; and
the condenser has a heat output that is controlled to regulate a temperature in a space, with the dehumidifying device simultaneously controlling the humidity and the temperature in the space.
2. The dehumidifying device of claim 1, wherein:
the cooling coil includes a first cooling coil and a second cooling coil which are operated alternatingly;
the first cooling coil includes a first defrosting unit and a first electric throttle;
the second cooling coil includes a second defrosting unit and a second electric throttle;
after the first cooling coil performs dehumidifying and frosting to have a predetermined thickness, the second electric throttle is switched to the second cooling coil, with the second cooling coil performing dehumidifying and frosting, and with the first cooling coil performing defrosting; and
the first cooling coil and the second cooling coil are operated successively and periodically to achieve a dehumidifying function under a condition of lower than the dew point of 0° C.
US15/960,618 2018-04-24 2018-04-24 Dehumidifying Device with Temperature Control Abandoned US20190323761A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/960,618 US20190323761A1 (en) 2018-04-24 2018-04-24 Dehumidifying Device with Temperature Control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15/960,618 US20190323761A1 (en) 2018-04-24 2018-04-24 Dehumidifying Device with Temperature Control

Publications (1)

Publication Number Publication Date
US20190323761A1 true US20190323761A1 (en) 2019-10-24

Family

ID=68236324

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/960,618 Abandoned US20190323761A1 (en) 2018-04-24 2018-04-24 Dehumidifying Device with Temperature Control

Country Status (1)

Country Link
US (1) US20190323761A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112325395A (en) * 2020-10-23 2021-02-05 重庆阿泰可科技股份有限公司 Air duct structure for manufacturing low dew point air

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100579632C (en) * 2006-12-13 2010-01-13 财团法人工业技术研究院 Compound high pressure air cooling dehumidification system
US20160327313A1 (en) * 2015-05-07 2016-11-10 Wei-Yi Chiang Direct Expansion Heat Recovery Method and Device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100579632C (en) * 2006-12-13 2010-01-13 财团法人工业技术研究院 Compound high pressure air cooling dehumidification system
US20160327313A1 (en) * 2015-05-07 2016-11-10 Wei-Yi Chiang Direct Expansion Heat Recovery Method and Device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112325395A (en) * 2020-10-23 2021-02-05 重庆阿泰可科技股份有限公司 Air duct structure for manufacturing low dew point air

Similar Documents

Publication Publication Date Title
US20200400323A1 (en) Hvac unit with hot gas reheat
US7062930B2 (en) System and method for using hot gas re-heat for humidity control
US7726140B2 (en) System and method for using hot gas re-heat for humidity control
JP2010107059A (en) Refrigerating and air-conditioning apparatus
JP2006177658A (en) Air conditioner
US20220026099A1 (en) Hvac unit fan control systems and methods
JP2005291553A (en) Multiple air conditioner
WO2012085965A1 (en) Air conditioner
US20190323761A1 (en) Dehumidifying Device with Temperature Control
US20160327313A1 (en) Direct Expansion Heat Recovery Method and Device
JPH09310927A (en) Device for controlling refrigerant of air conditioner
US11221151B2 (en) Hot gas reheat systems and methods
KR100713827B1 (en) Method for controlling operation of multi type air-conditioner
JP2760500B2 (en) Multi-room air conditioner
JP2000018766A (en) Air conditioner
JP2007322037A (en) Air conditioner
US11143421B2 (en) Sequential hot gas reheat system in an air conditioning unit
WO2020255907A1 (en) Air conditioning system
CN214009419U (en) Heat pump condensation recycling dehumidification system
US20220107098A1 (en) Air conditioning system
JP2007192436A (en) Air conditioner
KR20000055119A (en) method for control outdoor fan of multi-air conditioner
JPH09287800A (en) Air conditioner
KR20000007824A (en) Air conditioner used as cooler and heater and control method
TWM565778U (en) Temperature controlled dehumidifier

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION