Apparatus and method for control of solid desiccant dehumidifiers
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/02
F24F-003/14
F24F-011/00
B01D-053/26
출원번호
US-0344353
(2012-09-12)
등록번호
US-9777933
(2017-10-03)
우선권정보
IN-2629/DEL/2011 (2011-09-12)
국제출원번호
PCT/IN2012/000609
(2012-09-12)
§371/§102 date
20150113
(20150113)
국제공개번호
WO2013/038428
(2013-03-21)
발명자
/ 주소
Pahwa, Deepak
Griffiths, William Charles
Sachdev, Rajan
Malik, Kuldeep Singh
출원인 / 주소
BRY AIR [ASIA] PVT. LTD.
대리인 / 주소
Abelman, Frayne & Schwab
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
The present invention generally discloses desiccant dehumidifiers control systems. In particular, the present invention relates to solid desiccant dehumidifiers which use a rotor (commonly called a wheel) to dehumidify a process airstream. The invention provides a novel apparatus for control of desi
The present invention generally discloses desiccant dehumidifiers control systems. In particular, the present invention relates to solid desiccant dehumidifiers which use a rotor (commonly called a wheel) to dehumidify a process airstream. The invention provides a novel apparatus for control of desiccant dehumidifiers and to an improved method of control of such dehumidifiers, and also to dehumidifiers provided with such control systems.
대표청구항▼
1. An apparatus for the control of a rotary solid desiccant dehumidifier having a desiccant wheel and provided with a process and reactivation sector, the apparatus consisting essentially of a central control unit; one or more sensors located proximal to the process sector and the reactivation secto
1. An apparatus for the control of a rotary solid desiccant dehumidifier having a desiccant wheel and provided with a process and reactivation sector, the apparatus consisting essentially of a central control unit; one or more sensors located proximal to the process sector and the reactivation sector, and operationally associated with the central control unit, in order to measure one or more of the air temperature entering the process sector, the air temperature entering the reactivation sector, the average bulk temperature of the air leaving the process sector, the average bulk temperature of the air leaving the reactivation sector, the temperature of the air leaving the process sector of the wheel just before it rotates into the next sequential sector, the temperature of the air leaving the reactivation sector of the wheel just before it rotates into the next sequential sector, air temperatures just before the wheel rotates out of the process and/or reactivation sectors, air temperatures on either side of a purge recirculation loop, the central control unit being provided with a processing unit to process received data and generate output signal(s) using a pre-determined algorithm, the central control unit being operationally connected with one or more of the dehumidifier components to transmit output signals thereto and control their functioning including a process air moving means, a reactivation air moving means, a reactivation air heating means, a process air pre-cooling means (if used), and a desiccant wheel rotating means. 2. An apparatus as claimed in claim 1 wherein the central control unit is a PLC unit, a building automation system unit, or a set of multiple single-loop controllers provided with the capability for multiple inputs for sensed variables and Proportional-Integral-Derivative control output, or a dedicated single board computer that is designed specifically to provide the sensed inputs and control outputs. 3. An apparatus as claimed in claim 1 wherein the apparatus is provided with a sensor located proximal to the process sector to measure the humidity of the air entering the process sector and provide data generated thereby to the central control unit. 4. An apparatus as claimed in claim 1 wherein the apparatus includes a sensor to provide data to the central control unit by measuring the average bulk humidity of the air leaving the process sector. 5. An apparatus as claimed in claim 1 wherein a bypass duct is provided around the process sector, means are provided for controlling the flow of air through the bypass duct, and means are provided for controlling the flow of air through the process sector of the wheel, in both cases as a function of output signals from the central control unit. 6. An apparatus as claimed in claim 5 wherein the apparatus is provided with a sensor to provide data to the central control unit by measuring the humidity of the process air after the process air and the bypass air have been mixed. 7. An apparatus as claimed in claim 1 wherein the dehumidifier is provided with a purge sector located sequentially between the reactivation sector and the process sector and means for passing an airstream through the purge sector and directing it to become at least a portion of the air entering the reactivation sector of the wheel. 8. An apparatus as claimed in claim 7 wherein one or more sensor(s) are provided proximal to the surface of the purge sector to sense the average bulk temperature of the air leaving the purge sector and provide the data generated to the central control unit. 9. An apparatus as claimed in claim 7 wherein one or more sensors are provided proximal to the surface of the purge sector to sense the temperature of the air leaving the purge sector just before it rotates into the next sequential sector and provide the data generated to the central control unit. 10. An apparatus as claimed in claim 7 wherein means are provided to control the airflow through the purge sector and are operationally controlled by an output signal from the central control unit. 11. An apparatus as claimed in claim 1 wherein a first sector is disposed sequentially between the process and reactivation sectors, a second sector is disposed sequentially between the reactivation and process sectors and means are provided for re-circulating an airstream through the two sectors. 12. An apparatus as claimed in claim 11 wherein at least one sensor is provided to sense the temperature of the re-circulating airstream on at least one side of the wheel and provide data generated thereby to the central control unit. 13. An apparatus as claimed in claim 11 wherein the means for re-circulating an airstream through the two sectors is operationally associated with the central control unit via an output signal generated based on data sensed by the sensor measuring the temperature of the re-circulating airstream. 14. An apparatus as claimed in claim 1 wherein said one or more sensors are thermistors, thermocouples, platinum resistance temperature detection sensors, or any combination thereof. 15. An apparatus as claimed in claim 3 wherein the humidity sensor is a chilled mirror type, a thin film capacitance type or a hygroscopic filter type humidity sensor. 16. A method for control of a rotary solid desiccant dehumidifier having a desiccant wheel and provided with at least a process and reactivation sector, the method comprising: (a) sensing and measuring any one or more of the following parameters: the air temperature entering the process sector, the air temperature entering the reactivation sector, the average bulk temperature of the air leaving the process sector, the average bulk temperature of the air leaving the reactivation sector, the temperature of the air leaving the process sector of the wheel just before it rotates into the next sequential sector, and the temperature of the air leaving the reactivation sector of the wheel just before it rotates into the next sequential sector through one or more sensors provided at determined positions proximal to the surface of the desiccant wheel, air temperatures just before the wheel rotates out of the process and/or reactivation sectors, air temperatures on either side of a purge recirculation loop;(b) forwarding the data generated by said one or more sensors to a central control unit;(c) processing said data received in said central control unit according to a pre-determined algorithm;(d) generating and forwarding output signals to one or more apparatus components including process air moving means, reactivation air moving means, reactivation air heating means, process air pre-cooling means, and desiccant wheel rotating means. 17. A method as claimed in claim 16 wherein, the humidity of the air entering the process sector is measured and forwarded to the central control unit. 18. A method as claimed in claim 16 wherein the average bulk humidity of the air leaving the process sector is sensed and forwarded to the central control unit. 19. A method as claimed in claim 16 wherein a bypass duct is provided around the process sector, and air flow through the bypass duct or the process sector are controlled via respective control means that are responsive to respective output signals from the central control unit. 20. A method as claimed in claim 19 wherein the humidity of the process air is sensed and measured after the process air and the bypass air have been mixed, and data generated then sent to the central control unit for processing and generation of appropriate output signals. 21. A method as claimed in claim 16 further comprising passing an airstream through a purge sector provided sequentially between the reactivation sector and the process sector and directing it to become at least a portion of the air entering the reactivation sector of the wheel and sensing the average bulk temperature of the air leaving the purge sector. 22. A method as claimed in claim 21 wherein the temperature of the air leaving the purge sector of the wheel is sensed using one or more sensors just prior to the wheel rotating into the next sequential sector, and this data is transmitted to the central control unit. 23. A method as claimed in claim 21 wherein the airflow through the purge sector is controlled by an output signal generated by the central control unit sent to an airflow controlling means. 24. A method as claimed in claim 16 wherein an airflow is re-circulated between a first sector disposed sequentially between the process and the reactivation sectors and a second sector disposed sequentially between the reactivation and process sectors, through means for recirculation provided for re-circulating an airstream through the two sectors. 25. A method as claimed in claim 24 wherein the temperature of the recirculating airstream on at least one side of the wheel is sensed through at least one sensor and data generated forwarded to the central control unit for processing. 26. A method as claimed in claim 24 wherein, the re-circulation of the airstream is controlled by means of an output signal from the central control unit. 27. An apparatus as claimed in claim 3 wherein the humidity sensor is a chilled mirror type, a thin film capacitance type or a hygroscopic filter type humidity sensor.
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이 특허에 인용된 특허 (6)
Fischer, Jr., John C.; Boles, Michael L.; Mitchell, Richard K., Building, ventilation system, and recovery device control.
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