Dehumidifiier cascade system and process
a cascade system and dehumidifier technology, applied in space heating and ventilation control systems, lighting and heating apparatuses, heating types, etc., can solve the problems of airborne contaminants, ineffective humidity control of most conventional air conditioning processes and systems, and insufficient humidity control of humidity
Inactive Publication Date: 2021-05-20
LANDRY GERALD G
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Benefits of technology
The patent text describes a dehumidification system that can control humidity in indoor environments without causing excessive energy consumption or damage to the building or space. The system uses a rotor technology to absorb and release moisture from the air, similar to a refrigerant vapor-compression cycle. The challenge is to reach the dew point and the low dew point, which requires a large amount of energy. The text also discusses the challenges of conventional desiccant rotor technology, such as air heating and difficulty in reaching low dew points. The patent text proposes a solution to these challenges by incorporating a re-circulating air stream and a heat exchanger to pre-condition the desiccant rotor and improve the dehumidification process.
Problems solved by technology
Airborne contaminants are also often carried with the moisture in the supplied air streams.
Most conventional air conditioning processes and systems do not effectively control humidity.
Although conventional systems provide dehumidification, this dehumidification is an uncontrolled byproduct of its evaporator coil cooling process, resulting in inadequate control of humidity, excessive energy consumption, and possible building and / or building space content damage.
Consequently, a dehumidifier does not typically enhance the cooling efficiency of, for example, a central air conditioner.
However, they are not rated in terms of energy savings provided on the central air conditioning cooling cost.
The second challenge is reaching a low dew point which is very difficult with cooling coils simply because the cooling coils often freeze below the freezing point.
Also, considering that at low dew point refrigerant type system loses exponentially their energy effectiveness.
The latent to sensible energy ratio diminishes the effectiveness of these system especially if the intake air is not saturated.
These systems do not necessarily reach an optimally low dew point, due to risk of frost and waste energy, by having to continuously re-cool the entering air back to a coil dew point.
These properties diminish energy transfer capabilities and effectiveness.
Ice buildup on the fins can also restrict the air path and further diminish the conductive thermal energy transfer capabilities and efficiencies of a refrigerant.
Typically, in an evaporator heat exchanger, the exchange of energy between the refrigerant and its crossing air stream is of a conductive nature and creates a unfavorable situation of frost when attempting to get a conditioned air to a lower dew point.
The temperature of the water on the fins tends to become lower quickly, because of their direct conductive energy exchange, and at lower temperatures it consequently crystallizes and freezes, thereby becoming an insulator, something that diminishes energy transfer capabilities and effectiveness.
A resulting ice buildup can also restrict the air path and further diminish the conductive thermal energy transfer capabilities and efficiencies of the refrigerant.
For instance, a method using a timer or a pressure or temperature sensor recognizing the ice buildup, may cause the refrigeration process to pause the cooling process should the air temperature of a coil reach a certain temperature.
The outdoor air coming into the heat exchanger being lower than the freezing point tends to freeze up the humidity of the outgoing air.
The frost then restricts the air flow and provide an insulation factor on the heat exchanger face surface diminishing energy exchange effectiveness.
The outdoor air coming into the heat exchanger may have a below zero-degree C. temperature, which tends to freeze up the humidity of the outgoing air, such that frost or ice forms in the outgoing air channels.
Method used
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[0036]The following provides a dehumidification system or unit in a cascade arrangement downstream to an air conditions system. More particularly, this may provide a dehumidifier in a sequence flow of delivery air of a cooling system. This dehumidifier may, for instance, include any type of air-to-air heat exchanger that enables the focus of its cooling to be towards latent energy.
[0037]Pre-cooling air processed through a dehumidifier prior to its entering the vicinity of a cooling coil saves on the amount of energy needed for dehumidification and serves to lower the associated dew point.
[0038]FIG. 3 is a line diagram illustrating a process flow showing a first cooling coil 9 coupled to intake air 8 and air path 12 from first cooling coil 9. Intake air 8 provides air to first cooling coil 9 which pre-cools air to a lower temperature resulting in a higher relative humidity. Air path 12 becomes the air stream 1 that enters heat exchanger 10 prior to a process of dehumidification provi...
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A dehumidification system is provided having a first cooling system which provides a sensible cooling effect and having its delivery enter a second system, in which air is favorably preconditioned using a pre-cooling upstream from and prior to dehumidification. A second unit having its own cooling element combined with an air to air heat exchanger in recovering the sensible cooling energy provides dehumidification through a dehumidification system in a cascade arrangement downstream to an air conditioning system. Pre-cooling is provided
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]The present application claims priority to U.S. Provisional Patent Application No. 62 / 974,082, filed on Nov. 15, 2019, entitled “[ ],” and U.S. Provisional Patent Application No. 63 / 204,358 filed on Sep. 29, 2020, entitled “[ ],” the entire disclosures of which are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]The control of humidity in indoor environments plays a very important role in providing indoor air quality. Reducing the volume of moisture indoors can reduce the growth of microbiological organisms such as mold, mildew and bacteria, which require moisture to thrive. Airborne contaminants are also often carried with the moisture in the supplied air streams. Most conventional air conditioning processes and systems do not effectively control humidity. Although conventional systems provide dehumidification, this dehumidification is an uncontrolled byproduct of its evaporator coil cooling process, resulting in inad...
Claims
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Login to View More IPC IPC(8): F24F11/00F24F3/14
CPCF24F11/0008F24F3/1405F24F3/14F24F3/153
InventorLANDRY, GERALD G.
OwnerLANDRY GERALD G