Method and apparatus for reheat dehumidification with variable speed outdoor fan
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-001/00
F25B-049/02
출원번호
US-0954558
(2015-11-30)
등록번호
US-10161662
(2018-12-25)
발명자
/ 주소
Goel, Rakesh
Berg, Eric
출원인 / 주소
Lennox Industries LLC
대리인 / 주소
Winstead PC
인용정보
피인용 횟수 :
0인용 특허 :
18
초록▼
An HVAC system includes an indoor unit having a return air duct and a supply air duct in an enclosed space. The HVAC system includes an outdoor unit having a variable-speed condenser fan. A first temperature sensor is disposed in at least one of the return air duct, the supply air duct, or an enclos
An HVAC system includes an indoor unit having a return air duct and a supply air duct in an enclosed space. The HVAC system includes an outdoor unit having a variable-speed condenser fan. A first temperature sensor is disposed in at least one of the return air duct, the supply air duct, or an enclosed space. A controller is operatively coupled to the first temperature sensor, and the variable-speed condenser fan. The controller is configured to determine whether at least one of over-cooling or over-heating of air in the enclosed space is occurring. Responsive to a determination that at least one of over-cooling or over-heating of air in the enclosed space is occurring, the controller adjusts a speed of the variable-speed condenser fan.
대표청구항▼
1. A heating, ventilation, and air conditioning (HVAC) system comprising: an indoor unit comprising a return air duct and a supply air duct in an enclosed space;an outdoor unit comprising a variable-speed condenser fan;a first temperature sensor disposed in the return air duct;a second temperature s
1. A heating, ventilation, and air conditioning (HVAC) system comprising: an indoor unit comprising a return air duct and a supply air duct in an enclosed space;an outdoor unit comprising a variable-speed condenser fan;a first temperature sensor disposed in the return air duct;a second temperature sensor disposed in the supply air duct;a controller operatively coupled to the first temperature sensor and the variable-speed condenser fan;wherein the controller is configured to: measure, using the first temperature sensor, an air temperature in the return air duct;measure, using the second temperature sensor, an air temperature in the supply air duct;determine a temperature difference between the air temperature in the return air duct and the air temperature in the supply air duct; anddetermine whether the temperature difference is increasing, decreasing, or remaining stable;wherein, responsive to a determination that the temperature difference is increasing, the controller reduces a speed of the variable-speed condenser fan; andwherein responsive to a determination that the temperature difference is decreasing, the controller increases the speed of the variable-speed condenser fan. 2. The system of claim 1, wherein the controller is configured to detect humidity of air in the enclosed space. 3. The system of claim 1, wherein the controller is configured to decrease a speed of the variable-speed condenser fan responsive to a determination that over-cooling occurs. 4. The system of claim 3, wherein decreasing the speed of the variable-speed condenser fan reduces over-cooling by the HVAC system. 5. The system of claim 1, wherein the controller is configured to increase a speed of the variable-speed condenser fan responsive to a determination that over-heating occurs. 6. The system of claim 5, wherein increasing the speed of the variable-speed condenser fan reduces over-heating by the HVAC system. 7. The system of claim 1, wherein: adjustment of the speed of the variable-speed condenser fan maintains an S/T ratio of the HVAC system in a range of approximately −0.1 to approximately 0.1; andthe S/T ratio is a ratio of sensible heat removed from the enclosed space to total heat removed from the enclosed space. 8. A method comprising: receiving, by a controller associated with a heating, ventilation, and air conditioning (HVAC) system, an air temperature in a return air duct and an air temperature in a supply air duct;determining, via the controller, a temperature difference between the air temperature in the return air duct and the air temperature in the supply air duct;determining, via the controller, if the temperature difference is increasing, decreasing, or remaining stable;responsive to a determination that the temperature difference is increasing, reducing, via the controller, a speed of a variable-speed condenser fan of the HVAC system; andresponsive to a determination that the temperature difference is decreasing, increasing, via the controller, the speed of the variable-speed condenser fan. 9. The method of claim 8, wherein the determination that the temperature difference is increasing is indicative of over-cooling. 10. The method of claim 9, wherein the reducing the speed of the variable-speed condenser fan corrects over-cooling by the HVAC system. 11. The method of claim 8, wherein the determination that the temperature difference is decreasing is indicative of over-heating. 12. The method of claim 11, wherein the increasing the speed of the variable-speed condenser fan corrects over-heating by the HVAC system. 13. The method of claim 8, comprising maintaining an S/T ratio of the HVAC system in a range of approximately −0.1 to approximately 0.1, wherein the S/T ratio is a ratio of sensible heat removed from an enclosed space to total heat removed from the enclosed space. 14. The method of claim 13, wherein the maintaining maximizes a latent capacity of the HVAC system. 15. The method of claim 13, wherein the maintaining facilitates air dehumidification without an associated change of temperature of conditioned air. 16. A heating, ventilation, and air conditioning (HVAC) system comprising: an indoor unit comprising a return air duct and a supply air duct in an enclosed space;an outdoor unit comprising a variable-speed condenser fan;a first temperature sensor disposed in the return air duct;a second temperature sensor disposed in the supply air duct;a controller operatively coupled to the first temperature sensor, the second temperature sensor, and the variable-speed condenser fan;wherein the controller is configured to: measure, using the first temperature sensor, an air temperature in the return air duct;measure, using the second temperature sensor, an air temperature in the supply air duct;determine a temperature difference between the air temperature in the return air duct and the air temperature in the supply air duct; anddetermine whether the temperature difference is increasing, decreasing, or remaining stable;wherein, responsive to a determination that the temperature difference is increasing, the controller reduces a speed of the variable-speed condenser fan; andwherein responsive to a determination that the temperature difference is decreasing, the controller increases the speed of the variable-speed condenser fan;wherein adjustment of the speed of the variable-speed condenser fan maintains an S/T ratio of the HVAC system in a range of approximately −0.1 to approximately 0.1; andwherein the S/T ratio is a ratio of sensible heat removed from the enclosed space to total heat removed from the enclosed space.
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이 특허에 인용된 특허 (18)
Michael K. West, Air conditioner and controller for active dehumidification while using ambient air to prevent overcooling.
Chamorro, Carlos O.; Hundt, Roger C.; Stachler, John P.; Walter, Stephen A., Outdoor fan and indoor blower controller for heating, ventilation and air conditioning system and method of operation thereof.
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