초록 ▼

In accordance with the present invention, a space conditioning system having multi-stage cooling and dehumidification capability is provided. The system includes plural refrigeration circuits operable in a cooling mode to provide cooled air to an indoor space. At least one of the refrigeration circu

In accordance with the present invention, a space conditioning system having multi-stage cooling and dehumidification capability is provided. The system includes plural refrigeration circuits operable in a cooling mode to provide cooled air to an indoor space. At least one of the refrigeration circuits is also operable in a reheat mode, wherein air is dehumidified by cooling it and then reheating it before it is supplied to the space. A control system is provided for controlling the operation of the refrigeration circuits to satisfy both a demand for cooling and a demand for dehumidification. Depending upon the level of demand for cooling, the system is operated to satisfy the dehumidification demand and the cooling demand simultaneously. However, in response to a higher level of demand for cooling (e.g., a second stage demand, or in some cases, a higher demand), the demand for cooling takes priority over the dehumidification demand. When the system is equipped with an economizer option, the economizer is operated to provide free cooling when the ambient outdoor air conditions are suitable. However, when a demand for dehumidification is present, the economizer option is not used, even if the ambient outdoor air conditions are suitable and there is a demand for cooling in the space.

대표청구항 ▼

In accordance with the present invention, a space conditioning system having multi-stage cooling and dehumidification capability is provided. The system includes plural refrigeration circuits operable in a cooling mode to provide cooled air to an indoor space. At least one of the refrigeration circu

In accordance with the present invention, a space conditioning system having multi-stage cooling and dehumidification capability is provided. The system includes plural refrigeration circuits operable in a cooling mode to provide cooled air to an indoor space. At least one of the refrigeration circuits is also operable in a reheat mode, wherein air is dehumidified by cooling it and then reheating it before it is supplied to the space. A control system is provided for controlling the operation of the refrigeration circuits to satisfy both a demand for cooling and a demand for dehumidification. Depending upon the level of demand for cooling, the system is operated to satisfy the dehumidification demand and the cooling demand simultaneously. However, in response to a higher level of demand for cooling (e.g., a second stage demand, or in some cases, a higher demand), the demand for cooling takes priority over the dehumidification demand. When the system is equipped with an economizer option, the economizer is operated to provide free cooling when the ambient outdoor air conditions are suitable. However, when a demand for dehumidification is present, the economizer option is not used, even if the ambient outdoor air conditions are suitable and there is a demand for cooling in the space. y 90 degrees to each other. ng an output signal operative to cancel said acoustical sound; and at least one speaker driven by said output signal of said controller, said at least one speaker producing an acoustical output operative to substantially cancel said acoustical sound within said interior of said housing. 15. The lawnmower of claim 14 wherein said acoustical sensor comprises at least one microphone disposed within said interior of said housing. 16. The lawnmower of claim 14 wherein said controller determines said output signal substantially 180 degrees out of phase with said acoustical sound. 17. A self-propelled mower comprising: a frame supported upon a plurality of ground engaging wheels; an internal combustion engine; an electrical generator creating electrical power from a mechanical input generated by said internal combustion engine, said electrical generator and said internal combustion engine producing a collective motor sound; a plurality of cutting elements; a housing enclosing said internal combustion engine and said electrical generator; a sound abating material disposed on said housing; a sound generating system producing sound in response to said collective motor sound, said sound produced by said sound generating system and said collective motor sound having a net cumulative sound lower than said collective motor sound. 18. The lawnmower of claim 17 wherein said sound generating system further includes: an acoustical sensor for detecting acoustical sound generated within the interior of said housing, said acoustical sensor generating an output signal varying in accordance with said acoustical sound; a controller receiving said output signal and determining an output signal operative to cancel said acoustical sound; and at least one speaker driven by said output signal of said controller, said at least one speaker producing an acoustical output operative to substantially cancel said acoustical sound within said interior of said housing. 19. The lawnmower of claim 18 wherein said acoustical sensor comprises at least one microphone disposed within said interior of said housing. 20. The lawnmower of claim 18 wherein said controller determines said output signal substantially 180 degrees out of phase with said acoustical sound.